Shifting system for vehicle transmission and method of operating the shifting system

Abstract

A shift system for a vehicle transmission includes an input member and a selectable one-way clutch, which is rotatably coupled to the input member. The selectable one-way clutch is movable between a first clutch position, a second clutch position, and a third clutch position. The shift system also includes a disconnect member coupled to the input member and movable between a first disconnect position and a second disconnect position, and an output member selectively rotatable with the input member. The shift system also includes a shift assembly for selectively rotatably coupling the input member and the output member. The shift assembly includes an input hub coupled to the input member, the input hub having a disconnect member that can engage with the disconnect member, and having a clutch engagement member. The clutch plate is coupled to the clutch engagement member and is movable between an engagement position and a disengagement position. The clutch plate carrier is coupled to the clutch plate and the output member to transmit torque from the clutch engagement member to the output member.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and all the benefits of U.S. Provisional Patent Application No. 62 / 946,156, filed on December 10, 2019, and U.S. Provisional Patent Application No. 63 / 091,775, filed on October 14, 2020, which are hereby expressly incorporated by reference in their entireties. Technical Field

[0003] The present invention generally relates to a shifting system for a vehicle transmission and to a method of operating the shifting system. Background Art

[0004] Conventional vehicles known in the art typically include a motor having a rotational output that provides a rotational input to a vehicle transmission. The motor is typically an internal combustion engine or an electric motor, and generates a rotational output that is selectively transmitted to a vehicle transmission, which in turn transmits a rotational torque to one or more wheels of the vehicle. The vehicle transmission varies the rotational speed and torque generated by the motor through a series of predetermined gear sets, whereby the change between the gear sets enables the vehicle to travel at different vehicle speeds for a given motor speed. The motor is typically an electric motor coupled to a vehicle transmission in an axle connected to the wheels of the vehicle.

[0005] Providing a rotational input to a vehicle transmission generally requires a shift system to selectively transfer torque to components of the vehicle transmission. Common shift systems include an input member rotatable about an axis (e.g., a rotational output from a motor), a disconnect coupled to the input member, and an output member selectively rotatable about an axis with the input member (e.g., providing the rotational input to the vehicle transmission). A shift assembly is also generally required to selectively rotationally couple the input member and the output member.

[0006] Shifting systems known in the art often suffer from high drag losses, which reduce the efficiency of torque transfer between the motor and the vehicle transmission. In addition, common shifting systems produce rough engagement between the motor and components of the vehicle transmission through the connection with the disconnect member, resulting in vibration and an uncomfortable driving experience in the vehicle.

[0007] Therefore, it is desirable to provide an improved shifting system for a vehicle transmission. Summary of the invention

[0008] A shifting system for a vehicle transmission includes an input member extending along an axis between a first end and a second end spaced apart from the first end. The vehicle transmission has a gear set including a first gear ratio and a second gear ratio different from the first gear ratio. The input member is rotatable about the axis. The shifting system also includes a selectable one-way clutch rotatably coupled to the input member. The selectable one-way clutch is movable between a first clutch position, a second clutch position, and a third clutch position.

[0009] In a first clutch position, the selectable one-way clutch is configured to allow torque to be transmitted from the input member through one of the first gear ratio and the second gear ratio of the gear set in a first rotational direction or a second rotational direction opposite to the first rotational direction. In a second clutch position, the selectable one-way clutch is configured to allow torque to be transmitted from the input member through one of the first gear ratio and the second gear ratio of the gear set in the first rotational direction, and prevent torque from being transmitted from the input member through one of the first gear ratio and the second gear ratio of the gear set in the second rotational direction. In a third clutch position, the selectable one-way clutch is configured to prevent torque from being transmitted from the input member through one of the first gear ratio and the second gear ratio of the gear set in the first rotational direction or the second rotational direction.

[0010] The shift system also includes a disconnect member coupled to the input member. The disconnect member is movable between a first disconnect position and a second disconnect position. The output member is spaced apart from the input member, and the output member is selectively rotatable with the input member about the axis to selectively transmit torque through the other of the first gear ratio and the second gear ratio of the gear set.

[0011] The shift system also includes a shift assembly for selectively rotatably coupling the input member and the output member. The shift assembly includes an input hub coupled to the input member. The input hub has a disconnectable component that can engage with a disconnect member, and when the disconnect member is in a first disconnect position, the disconnectable component of the input hub is separated from the disconnect member, and when the disconnect member is in a second disconnect position, the disconnectable component of the input hub is engaged with the disconnect member.

[0012] The input hub has a clutch engaging member. The shift assembly also includes a plurality of clutch plates coupled to the clutch engaging member of the input hub. The plurality of clutch plates are movable between an engaged position and a disengaged position. In the engaged position, the clutch plates are engaged with each other. In the disengaged position, the clutch plates are disengaged from each other. The shift assembly also includes a clutch plate carrier coupled to the plurality of clutch plates and the output member so as to transmit torque from the clutch engaging member of the input hub to the output member through the plurality of clutch plates and the clutch plate carrier.

[0013] Thus, the shift system results in low drag losses, which increases the efficiency of torque transfer between the motor and the vehicle transmission. In addition, the shift system produces a smooth engagement between the motor and the vehicle transmission through the shift assembly (i.e., through connection with the disconnect member and engagement with the plurality of clutch plates), resulting in less vibration and a more comfortable driving experience. In addition, the selectable one-way clutch allows the shift system to achieve low spin losses by enabling the shift assembly to be rotationally decoupled when torque is not required to be transmitted through the shift assembly. The low spin losses allowed by the combination of the selectable one-way clutch and the shift assembly allow a net energy saving in the first gear ratio and the second gear ratio of the vehicle transmission compared to a single speed transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other advantages of the present invention will be readily appreciated as the present invention becomes better understood with reference to the following detailed description when considered in conjunction with the accompanying drawings, in which:

[0015] Figure 1A is a schematic diagram of a vehicle transmission including a shift system having an electric motor, an input member, a selectable one-way clutch rotatably coupled to and disposed about the input member for selectively transmitting torque through a first gear ratio, and a shift assembly coupled to the input member for selectively transmitting torque through a second gear ratio;

[0016] Figure 1B is a schematic diagram of a vehicle transmission including a countershaft, wherein a selectable one-way clutch is rotatably coupled to an input member, and a shift assembly is coupled to the countershaft;

[0017] Figure 2A is a schematic diagram of a vehicle transmission in which a selectable one-way clutch is rotatably coupled to and disposed about a countershaft, and a shift assembly is coupled to an input member;

[0018] Figure 2B is a schematic diagram of a vehicle transmission in which a selectable one-way clutch is rotatably coupled to and disposed about a countershaft, and a shift assembly is coupled to the countershaft;

[0019] Figure 3 is a schematic diagram of a shifting schedule for a shifting system of a vehicle transmission, wherein X / X represents a first clutch position, X / O represents a second clutch position, O / O represents a third clutch position, O / X represents a fourth clutch position, DP1 represents a first disconnected position, DP2 represents a second disconnected position, ENG represents an engaged position of a clutch plate of a shift assembly, and D-ENG represents a disengaged position of the clutch plate;

[0020] Figure 4A is a perspective view of a selectable one-way clutch, wherein the selectable one-way clutch is of a fixed variety, and wherein the selectable one-way clutch has an inner race, an outer race, a plurality of pawls circumferentially spaced from one another, and an actuator ring coupled to the pawls;

[0021] Figure 4B is a perspective view of a selectable one-way clutch, wherein the selectable one-way clutch is of a rotary type;

[0022] Figure 4C yes Figure 4B A cross-sectional view of a selectable one-way clutch;

[0023] Figure 5A is a cross-sectional view of a shift assembly having an apply plate and a plurality of clutch plates, wherein a disconnect member is in a first disconnect position in which the disconnect member is separated from an input hub of the shift assembly, and the apply plate is in a first plate position in which the plurality of clutch plates are in an engaged position;

[0024] Figure 5B is a cross-sectional view of the shift assembly, wherein the disconnect member is in a first disconnect position in which the disconnect member is separated from the input hub, and the apply plate is in a second plate position in which the plurality of clutch plates are in a disengaged position;

[0025] Figure 5C is a cross-sectional view of the shift assembly with the disconnect member in a second disconnect position in which the disconnect member is engaged with the input hub and the apply plate in a second plate position in which the plurality of clutch plates are in a disengaged position;

[0026] Figure 5D is a cross-sectional view of the shift assembly, wherein the disconnect member is in a second disconnect position DP2 in which the disconnect member is engaged with the input hub, and the apply plate is in a first disconnect position in which the plurality of clutch plates are in an engaged position;

[0027] Fig. 6A is a cross-sectional view of a shift assembly, wherein the disconnect member is a synchronizer, and wherein the disconnect member is in a first disconnect position in which the disconnect member is separated from the input hub, and the apply plate is in a first plate position in which the plurality of clutch plates are in an engaged position;

[0028] Figure 6B is a cross-sectional view of a shift assembly, wherein the disconnect member is a synchronizer, and wherein the disconnect member is in a first disconnect position in which the disconnect member is separated from the input hub, and the apply plate is in a second plate position in which the plurality of clutch plates are in a disengaged position;

[0029] Figure 6C is a cross-sectional view of a shift assembly, wherein the disconnect member is a synchronizer, and wherein the disconnect member is in a second disconnect position in which the disconnect member is engaged with the input hub, and the apply plate is in a second plate position in which the plurality of clutch plates are in a disengaged position;

[0030] Fig.6D is a cross-sectional view of a shift assembly, wherein the disconnect member is a synchronizer, and wherein the disconnect member is in a second disconnect position in which the disconnect member is engaged with the input hub, and the apply plate is in a first disconnect position in which the plurality of clutch plates are in an engaged position;

[0031] Fig. 7A is a cross-sectional view of the shift assembly, wherein the disconnect member is in a first disconnect position in which the disconnect member is separated from the input hub, and the apply plate is in a first plate position in which the plurality of clutch plates are in an engaged position;

[0032] Figure 7B is a cross-sectional view of the shift assembly, wherein the disconnect member is in a first disconnect position in which the disconnect member is separated from the input hub, and the apply plate is in a second plate position in which the plurality of clutch plates are in a disengaged position;

[0033] Figure 7C is a cross-sectional view of the shift assembly with the disconnect member in a second disconnect position in which the disconnect member is engaged with the input hub and the apply plate in a second plate position in which the plurality of clutch plates are in a disengaged position;

[0034] Fig.7D is a cross-sectional view of the shift assembly with the disconnect member in a second disconnect position in which the disconnect member is engaged with the input hub and the apply plate in a first disconnect position in which the plurality of clutch plates are in an engaged position; and

[0035] Figure 8 is a flow chart of a method of operating a shift system, wherein the method is directed to shifting a transmission of torque between a first gear ratio and a second gear ratio. DETAILED DESCRIPTION

[0036] Referring to the drawings, wherein like numerals refer to like parts throughout the several views, Figures 1A-2B A vehicle transmission 10 is provided in a schematic diagram in FIG. The vehicle transmission 10 has a gear set 12 including a first gear ratio 14 and a second gear ratio 16 different from the first gear ratio 14. Figures 1A-2BA shifting system 18 for a vehicle transmission 10 is shown in FIG.

[0037] The shift system 18 includes an input member 20 extending along an axis A between a first end 22 and a second end 24 spaced apart from the first end 22. The input member 20 is rotatable about the axis A. As a non-limiting example, the input member 20 may be a shaft or a gear. The shift system 18 also includes a selectable one-way clutch 26 that is rotatably coupled to the input member 20 and that is selectable in a first clutch position (in a Figure 3 Indicated as X / X), the second clutch position (in Figure 3 and the third clutch position (indicated as X / O in Figure 3 It can move between two devices (represented as O / O in the figure).

[0038] In the first clutch position X / X, if Figure 3 As shown in , the selectable one-way clutch 26 is configured to allow torque to be transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 of the gear set 12 in a first rotational direction D1 or a second rotational direction D2 opposite to the first rotational direction. In the first clutch position X / X, the selectable one-way clutch 26 is in a locked / locked configuration. In this locked / locked configuration, torque can be transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the first rotational direction D1. It will also be understood that torque can be transmitted to the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the second rotational direction D2. In other words, in the first clutch position X / X, torque can be transmitted in the first rotational direction D1 or the second rotational direction D2. It will be understood that the first rotational direction D1 can be a clockwise direction, while the second rotational direction D2 can be a counterclockwise direction. Alternatively, it will be understood that the first rotational direction D1 can be a counterclockwise direction, while the second rotational direction D2 can be a clockwise direction.

[0039] In the second clutch position X / O, if Figure 3As shown in , the selectable one-way clutch 26 is configured to allow torque to be transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 of the gear set 12 in the first rotational direction D1, and prevent torque from being transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 of the gear set 12 in the second rotational direction D2. In the second clutch position X / O, the selectable one-way clutch 26 is in a locked / free configuration. In this locked / free configuration, torque can be transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the first rotational direction D1. However, torque is prevented from being transmitted to the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the second rotational direction D2. This locked / free configuration is generally considered to enable the selectable one-way clutch 26 to overrun, and facilitates the conversion from transmitting torque through the first gear ratio 14 to transmitting torque through the second gear ratio 16, or vice versa. Therefore, the second clutch position X / O can be referred to as a shift-ready position.

[0040] In the third clutch position O / O, if Figure 3 As shown in , the selectable one-way clutch 26 is configured to prevent torque from being transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 of the gear set 12 in the first rotational direction D1 or the second rotational direction D2. In the third clutch position O / O, the selectable one-way clutch 26 is in a free / free configuration. In this free / free configuration, torque is prevented from being transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the first rotational direction D1. In this free / free configuration, torque is also prevented from being transmitted to the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the second rotational direction D2. The free / free configuration limits drag losses on the shift system 18 by rotationally decoupling one of the first gear ratio 14 and the second gear ratio 16 from the input member 20.

[0041] The shift system 18 further includes a disconnect member 28 coupled to the input member 20. The disconnect member 28 is in a first disconnect position DP1 (eg, Figure 3 , 5A , 5B, 6A, 6B, 7A and 7B) and the second disconnection position DP2 (as shown in Figure 3 , 5C, 5D, 6C, 6D, 7C and 7D). The shift system 18 includes an output member 30 that is spaced apart from the input member 20 and is selectively rotatable with the input member 20 about the axis A to selectively transmit torque through the other of the first gear ratio 14 and the second gear ratio 16 of the gear set 12.

[0042] The shift system 18 also includes a shift assembly 32 for selectively rotatably coupling the input member 20 and the output member 30. The shift assembly 32 includes an input hub 34 coupled to the input member 20. The input hub 34 has a disconnectable component 36 that is engageable with the disconnect member 28, and when the disconnect member 28 is in the first disconnect position DP1, the disconnectable component 36 of the input hub 34 is separated from the disconnect member 28, and when the disconnect member 28 is in the second disconnect position DP2, the disconnectable component 36 of the input hub 34 is engaged with the disconnect member 28.

[0043] The disconnecting member 28 can rotatably disconnect the input member 20 and the disconnectable component 36, thereby rotatably disconnecting the input member 20 and the input hub 34. In one embodiment, the disconnecting member 28 is a disconnecting clutch. Alternatively, in another embodiment, the disconnecting member 28 is a synchronizer. In the embodiment where the disconnecting member 28 is a synchronizer, the synchronizer may have a synchronizer ring, a synchronizer cone, a synchronizer hub and a synchronizer sleeve. In yet another embodiment, the disconnecting member 28 is a dog clutch.

[0044] The input hub 34 has a clutch engaging member 38. The shift assembly 32 includes a plurality of clutch plates 40 coupled to the clutch engaging member 38 of the input hub 34. The plurality of clutch plates 40 are movable between an engaged position ENG and a disengaged position D-ENG. In the engaged position ENG, as shown in FIG. Figure 3 , 5A , 5D, 6A, 6D, 7A and 7D, the clutch plates 40 are engaged with each other. In the disengaged position D-ENG, as shown in FIG. Figure 3 , 5B , 5C, 6B, 6C, 7B and 7C, the clutch plates 40 are separated from each other. The shift assembly 32 also includes a clutch plate carrier 42, which is coupled to the plurality of clutch plates 40 and the output member 30 to transmit torque from the clutch engaging part 42 of the input hub 34 to the output member 30 through the plurality of clutch plates 40 and the clutch plate carrier 42.

[0045] The shift system 18 results in low drag losses, which increases the efficiency of torque transfer between the motor and the vehicle transmission 10. In addition, the shift system 18 produces a smooth engagement between the motor and the vehicle transmission 10 through the shift assembly 32 (i.e., through the connection with the disconnect 28 and the engagement of the plurality of clutch plates 40), resulting in less vibration and a more comfortable driving experience. In addition, the selectable one-way clutch 26 allows the shift system 18 to achieve low spin losses by rotationally decoupling the shift assembly 32 when torque is not required to be transmitted through the shift assembly 32. The low spin losses allowed by the combination of the selectable one-way clutch 26 and the shift assembly 32 allow the first gear ratio 14 and the second gear ratio 16 of the vehicle transmission 10 to achieve a net energy savings compared to a single speed transmission.

[0046] It will be appreciated that the motor may be an internal combustion engine or may be an electric motor. It will also be appreciated that the motor may be coupled to the rear axle of the vehicle. In one embodiment, the motor is an electric motor and is rotatably coupled to the rear axle of the vehicle and is configured to rotate the rear axle of the vehicle to propel the vehicle.

[0047] like Figure 4A As shown in FIG. 4C , the selectable one-way clutch 26 may have an inner race 44 and an outer race 46 disposed around the inner race 44. In other words, the inner race 44 and the outer race 46 may be concentric with each other. Figure 1A and 1B As shown in FIG. 1 , the inner race 44 and the outer race 46 of the selectable one-way clutch 26 can be disposed about the input member 20 and axially aligned with the input member 20. The inner race 44 of the selectable one-way clutch 26 can be rotatably coupled to the input member 20. In a non-limiting example, the inner race 44 can be splined to the input member 20 such that rotation of the input member 20 causes rotation of the inner race 44 of the selectable one-way clutch 26. Additionally or alternatively, the inner race 44 of the selectable one-way clutch 26 can be bolted to the input member 20 or otherwise mechanically fastened to the input member 20.

[0048] The selectable one-way clutch 26 may also have at least one pawl 48 disposed between the inner race 44 and the outer race 46. The pawl 48 selectively rotatably couples the inner race 44 and the outer race 46. In a non-limiting example, the pawl 48 may be rotatable to engage both the inner race 44 and the outer race 46 to prevent relative rotation between the inner race 44 and the outer race 46. It will be appreciated that the pawl 48 may allow rotational coupling between the inner race 44 and the outer race 46 in the first rotational direction D1 while preventing rotational coupling between the inner race 44 and the outer race 46 in the second rotational direction D2. Alternatively, it will be appreciated that the pawl 48 may allow rotational coupling between the inner race 44 and the outer race 46 in the second rotational direction D2 while preventing rotational coupling between the inner race 44 and the outer race 46 in the first rotational direction D1. The pawl 48 may also prevent or allow rotational coupling between the inner race 44 and the outer race 46 in both the first rotational direction D1 and the second rotational direction D2.

[0049] The at least one pawl 48 can be further defined as a plurality of pawls 50 spaced circumferentially from one another. The selectable one-way clutch 26 can also include an actuator ring 52 coupled to the plurality of pawls 50 for selectively rotatably locking the inner race 44 and the outer race 46 together. The actuator ring 52 can be in physical contact with the pawls 50 so that movement, such as rotation, of the actuator ring 52 causes movement, such as rotation, of the pawls 50. The actuator ring 52 can be electrically actuated by a small electric motor or solenoid. The small electric motor or solenoid can be coupled to the outer race 46 of the selectable one-way clutch 26. It will also be appreciated that the actuator ring 52 can be hydraulically, pneumatically, or otherwise actuated.

[0050] The shift assembly 32 may also include a biasing member 54 coupled to the plurality of clutch plates 40 to bias the plurality of clutch plates 40 toward the engagement position ENG. In other words, the plurality of clutch plates 40 may be normally closed and stationary in the engagement position ENG. Because the plurality of clutch plates 40 of the shift assembly 32 are in the engagement position ENG when stationary due to the biasing member 54 biasing the plurality of clutch plates 40 toward the engagement position ENG, the shift assembly 32 is energy efficient, and therefore the shift system 18 is also energy efficient. In other words, because no power from an electronic actuator or a hydraulic actuator is required to maintain the plurality of clutch plates 40 in the engagement position ENG, the shift assembly 32 is energy efficient, and therefore the shift system 18 is energy efficient.

[0051] The shift assembly 32 may also include an apply plate 56 coupled to the biasing member 54. The apply plate 56 is movable between a first plate position, in which the plurality of clutch plates 40 are in the engaged position ENG, and a second plate position, in which the apply plate 56 is engaged with the biasing member 54 and the plurality of clutch plates 40 are in the disengaged position D-ENG.

[0052] In one embodiment, the apply plate 56 and the disconnect member 28 are movable independently of each other. The apply plate 56 can be moved from the first plate position to the second plate position, thereby causing the plurality of clutch plates 40 to move from the engaged position ENG to the disengaged position D-ENG, regardless of whether the disconnect member 28 is in the first position disconnect position DP1 or the second disconnect position DP2, and without affecting the position of the disconnect member 28. Similarly, the disconnect member 28 can be moved from the first disconnect position DP1 to the second disconnect position DP2, thereby causing the input hub 34 to be engaged, regardless of whether the apply plate 56 is in the first plate position or the second plate position, and without affecting the position of the apply plate 56.

[0053] In embodiments where the apply plate 56 and the disconnect member 28 are movable independently of one another, the shift system 18 may further include a first actuator coupled to the disconnect member 28 to move the disconnect member 28 from the first disconnect position DP1 to the second disconnect position DP2 independently of the apply plate 56, and a second actuator coupled to the apply plate 56 to move the apply plate 56 from the first plate position to the second plate position independently of the disconnect member 28. It will be appreciated that the first actuator and the second actuator may be movable by, but are not limited to, mechanical actuation, electrical actuation, hydraulic actuation, or pneumatic actuation.

[0054] In some embodiments, when the disconnect member 28 is in the second disconnect position DP2 and the apply plate 56 is in the first plate position, the input member 20 can be rotatably coupled to the output member 30. In other words, when the apply plate 56 is in the first plate position, in which the biasing member 54 can bias the plurality of clutch plates 40 toward the engaged position ENG, and when the disconnect member 28 is in the second disconnect position DP2, the input member 20 can be rotatably coupled to the output member 30. In these positions, torque can be transmitted from the input member 20 to the output member 30 through the input hub 34, the plurality of clutch plates 40, and the clutch plate carrier 42.

[0055] In some embodiments, when the disconnect member 28 is in the first disconnect position DP1 and / or when the apply tab 56 is in the second tab position, the input member 20 is rotationally decoupled from the output member 30. In other words, when the disconnect member 28 is in the first disconnect position DP1, the apply tab 56 is in the second tab position, or when the disconnect member 28 is in the first disconnect position DP1 and the apply tab 56 is in the second tab position, the input member 20 is rotationally decoupled from the output member 30. In these positions, torque cannot be transmitted from the input member 20 to the output member 30.

[0056] In an embodiment where the input member 20 is rotatably coupled to the output member 30 only when the disconnect member 28 is in the second disconnect position DP2 and the apply plate 56 is in the first plate position, the disconnect member 28 and the plurality of clutch plates 40 are arranged in series with each other. In other words, if the disconnect member 28 is in the first disconnect position DP1 where the disconnect member 28 is separated from the input hub 34, or the apply plate 56 is in the second plate position where the plurality of clutch plates 40 are separated, the input member 20 is rotatably decoupled from the output member 30. Therefore, when arranged in series, two disconnect members 28 must be engaged with the input hub 34, and the plurality of clutch plates 40 must be engaged with each other to directly transfer torque from the input member 20 to the output member 30.

[0057] The disconnectable component 36 of the input hub 34 and the clutch engaging component 42 of the input hub 34 may be integral with each other. Alternatively, the disconnectable component 36 of the input hub 34 and the clutch engaging component 42 of the input hub 34 may be separate components. In some embodiments, the clutch engaging component 42 of the input hub 34 may be rotatably connected to the disconnectable component 36 of the input hub 34 by using a key, a tab, or a bolt. It will be appreciated that the input hub 34 may be more than two components and may include a third component or more components to transmit torque from the input member 20 to the plurality of clutch plates 40.

[0058] In some embodiments, Figures 5A-6D As shown in , the shift assembly 32 also includes an intermediate application plate 58, which is coupled to the application plate 56 so that the application plate 56 is disposed between the intermediate application plate 58 and the biasing member 54. In the first plate position, the application plate 56 can contact through the intermediate application plate 58 to engage the plurality of clutch plates 40. In this embodiment, the intermediate application plate 58 transmits force to the application plate 56, and thus to the biasing member 54, so that the biasing member 54 moves and causes the plurality of clutch plates 40 to be in the disengaged position D-ENG. It will be appreciated that the intermediate application plate 58 may also be generally referred to as a release plate.

[0059] Although not required, the shift assembly 32 may also include a support ring 60 disposed between the biasing member 54 and the clutch engaging component 42 to support the plurality of clutch plates 40. The support ring 60 may be disposed about the axis A and rotatable with the input member 20 or the output member 30. Figures 7A-7D As shown in FIG. 8 , the support ring 60 may be spaced apart from the plurality of clutch plates 40 along the axis A and may be rotatably coupled to the clutch plate carrier 42 .

[0060] In some embodiments, Figures 7A-7D As shown in , the biasing member 54 is spaced apart from the clutch engaging component 42 of the input hub 34 and the clutch plate carrier 42 along the axis A, such that the clutch engaging component 42 of the input hub 34 is disposed between the biasing member 54 and the clutch plate carrier 42. In this embodiment, the support ring 60 is disposed between the biasing member 54 and the plurality of clutch plates 40, and between the biasing member 54 and the clutch engaging component 42 of the input hub 34.

[0061] In other embodiments, Figures 7A-7D , the clutch engaging component 42 of the input hub 34 is spaced apart from the biasing member 54 and the clutch plate carrier 42 along the axis A such that the biasing member 54 is disposed between the clutch engaging component 42 of the input hub 34 and the clutch plate carrier 42. In this embodiment, the support ring 60 is disposed between the biasing member 54 and the clutch engaging component 42.

[0062] In some embodiments, the biasing member 54 is a Belleville spring. However, it will be appreciated that the biasing member 54 may be any type of spring, including but not limited to a wave spring, a helical spring, and a conical spring.

[0063] like Figures 5A-6D As shown in , the output member 30 can be spaced apart from the input member 20 along the axis A. In embodiments where the output member 30 is spaced apart from the input member 20 along the axis A, the input member 20 can be a shaft and the output member 30 can also be a shaft. In such embodiments, the output member 30 can be the only output of the shift system 18.

[0064] It will be understood that in Figures 5A-6D In the embodiment illustrated in , the apply plate 56 can translate along the axis from the first plate position to the second plate position to translate the biasing member 54 along the axis. In doing so, the plurality of clutch plates 40 move from the engaged position ENG to the disengaged position D-ENG.

[0065] like Figures 7A-7D, the output member 30 can be radially spaced from the input member 20 and disposed around the input member 20. In embodiments where the output member 30 is radially spaced from the input member 20 and disposed around the input member 20, the output member 30 can be one of at least two outputs of the shift system 18. Another output other than the output member 30 itself can be the input member 20. In other words, if the disconnect member 28 is in the first disconnect position DP1 or the apply plate 56 is in the second plate position, the input member 20 is still able to transmit torque. It will be appreciated that in embodiments where the output member 30 is radially spaced from the input member 20 and disposed around the input member 20, the output member 30 can be a gear.

[0066] It will be understood that in Figures 7A-7D , the biasing member 54 can pivot about the pivot point of the biasing member 54 when the portion of the apply plate 56 closest to the input member 20 translates along the axis A. In doing so, the portion of the apply plate 56 farthest from the input member 20 moves away from the plurality of clutch plates 40, and the plurality of clutch plates 40 moves from the engaged position ENG to the disengaged position D-ENG. It will be appreciated that the pivot point at which the biasing member 54 can pivot is shown, where both the support ring 60 and the additional back plate are in contact with the biasing member 54. The contact area of ​​the support ring 60 and the additional back plate (where the support ring 60 and / or the additional back plate contact the biasing member 54) can be hardened to prevent wear.

[0067] In some embodiments, Figure 3 As shown in , the selectable one-way clutch 26 can also be moved to a fourth position, in which the selectable one-way clutch 26 is configured to allow torque to be transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 of the gear set 12 in the second rotational direction D1, and prevent torque from being transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 of the gear set 12 in the first rotational direction D1. In these embodiments, the selectable one-way clutch 26 is generally referred to as a four-mode clutch. It will also be understood that the selectable one-way clutch 26 can also be referred to as a multi-mode clutch module. Examples of multi-mode clutch modules are described in U.S. Pat. No. 9,151,345 (filed on June 2, 2014 and issued on October 6, 2015) and U.S. Pat. No. 9,726,236 (filed on January 27, 2014 and issued on August 8, 2017), the disclosures of which are incorporated by reference in their entirety.

[0068] The selectable one-way clutch 26 can be moved to the fourth clutch position (in Figure 3In an embodiment (indicated as O / X in the figure), the shift system 18 can allow the electric motor to regenerate. More specifically, the shift system 18 can allow regenerative braking. Torque can be transmitted to the electric motor from one of the first gear ratio 14 and the second gear ratio 16 through the selectable one-way clutch 26 and / or the shift assembly in the fourth clutch position O / X. In this case, the electric motor can be a generator that converts the rotational movement of the input member 20 into electrical energy.

[0069] The vehicle transmission may also include a countershaft 62 that is spaced apart from the input member 20 and rotatable about the axis A. It will be appreciated that the countershaft 62 may also be referred to as a collocated shaft 62. The selectable one-way clutch 26 may be configured to transmit torque from the input member 20 to the countershaft 62 via a first gear ratio 14. The shift assembly 32 may be configured to transmit torque from the output member 30 to the countershaft 62 via a second gear ratio 16. It will be appreciated that the output member 30 may be a shaft, a gear, or even the countershaft 62 itself.

[0070] It will be understood that if Figure 1A and 1B As shown in FIG. 1 , the inner race 44 and the outer race 46 of the selectable one-way clutch 26 can be disposed around the input member 20 and axially aligned with the input member 20. It will also be appreciated that in embodiments where the inner race 44 and the outer race 46 of the selectable one-way clutch 26 are disposed around the input member 20 and axially aligned with the input member 20, the shift assembly 32 can be as shown in FIG. Figure 1A is coupled to the input member 20 as shown in FIG. Figure 1B is shown coupled to countershaft 62 .

[0071] In another embodiment, Figure 2A and 2B As shown in , the inner race 44 and the outer race 46 of the selectable one-way clutch 26 are disposed about and axially aligned with the countershaft 62. In such an embodiment, the input member 20 extends directly from the motor to the shift assembly 32. However, it will be appreciated that in one or both embodiments where the selectable one-way clutch 26 is disposed about and axially aligned with the input member 20, or disposed about and axially aligned with the countershaft 62, the input member 20 may be solid, undivided, and unitary. It will also be appreciated that in embodiments where the inner race 44 and the outer race 46 of the selectable one-way clutch 26 are disposed about and axially aligned with the countershaft 62, the shift assembly 32 may be as Figure 2A is coupled to the input member 20 as shown in FIG. Figure 2B is shown coupled to countershaft 62 .

[0072] A method of operating the shift system 18 is also provided. The method includes the steps of moving a selectable one-way clutch 26 from a first clutch position X / X to a second clutch position X / O, wherein the selectable one-way clutch 26 is configured to allow torque to be transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in a first rotational direction D1 or a second rotational direction D2 opposite to the first rotational direction, and wherein the selectable one-way clutch 26 is configured to allow torque to be transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the first rotational direction D1 and prevent torque from being transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the second rotational direction D2. Figure 3 The steps of moving the selectable one-way clutch 26 from the first clutch position X / X to the second clutch position X / O are indicated in FIG. 1 by means of a shift schedule, in particular by means of elements A and B.

[0073] The method further includes moving the plurality of clutch plates 40 from an engaged position ENG in which the clutch plates 40 are engaged with each other to a disengaged position D-ENG in which the clutch plates 40 are disengaged from each other. Figure 3 The steps of moving the clutch plate 40 from the engaged position ENG to the disengaged position D-ENG are indicated by the shifting schedule (particularly by the element C).

[0074] The method further comprises the step of moving the disconnect member 28 from a first disconnect position DP1, in which the disconnectable component 36 of the input hub 34 is separated from the disconnect member 28, to a second disconnect position DP2, in which the disconnectable component 36 of the input hub 34 is engaged with the disconnect member 28. Figure 3 The shifting pattern in , in particular through the element D, indicates the steps for moving the disconnecting member 28 from the first disconnecting position DP1 to the second disconnecting position DP2.

[0075] The method further includes the step of moving the selectable one-way clutch 26 from the second clutch position X / O to a third clutch position O / O in which the selectable one-way clutch 26 is configured to prevent torque from being transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 in the first rotational direction D1 or the second rotational direction D2, so that the torque transmitted from the input member 20 through one of the first gear ratio 14 and the second gear ratio 16 is converted into the torque transmitted from the input member 20 through the other of the first gear ratio 14 and the second gear ratio 16. Figure 3The shift schedule in , in particular by element F, indicates the steps for moving the selectable one-way clutch 26 from the second clutch position X / O to the third clutch position O / O.

[0076] In one embodiment, the step of moving the selectable one-way clutch 26 from the first clutch position X / X to the second clutch position X / O precedes the step of moving the plurality of clutch plates 40 from the engaged position ENG to the disengaged position D-ENG. In addition, the step of moving the plurality of clutch plates 40 from the engaged position ENG to the disengaged position D-ENG may precede the step of moving the disconnecting member 28 from the first disconnecting position DP1 to the second disconnecting position DP2. In this way, the disconnecting member 28 may smoothly engage the disconnectable component 36 of the input hub 34 because the clutch plates 40 in the disengaged position D-ENG rotatably decouple the input member 20 from the output member 30.

[0077] Furthermore, the step of moving the disconnect member 28 from the first disconnect position DP1 to the second disconnect position DP2 may precede the step of moving the selectable one-way clutch 26 from the second clutch position X / O to the third clutch position O / O. The method may further include the following steps: Figure 3 , as indicated by the shift pattern in (particularly by element E), the plurality of clutch plates 40 are moved from the disengaged position D-ENG to the engaged position ENG. In other words, the clutch plates 40 can be reengaged. In an embodiment where the clutch plates 40 are normally closed, the step of moving the clutch plates 40 from the engaged position ENG to the disengaged position D-ENG causes the clutch plates to be stationary and to be able to transmit torque through the other of the first gear ratio 14 and the second gear ratio 16 through the shift assembly 32. In this way, torque is allowed to be transmitted through the other of the first gear ratio 14 and the second gear ratio 16 through the shift assembly 32. As discussed above, the selectable one-way clutch 26 can then be moved from the second clutch position X / O to the third clutch position O / O to rotationally decouple the input member 20 from the selectable one-way clutch 26 and prevent torque from being transmitted through one of the first gear ratio 14 and the second gear ratio 16.

[0078] The step of moving the disconnecting member 28 from the first disconnecting position DP1 to the second disconnecting position DP2 may be performed before the step of moving the plurality of clutch plates 40 from the disengaged position D-ENG to the engaged position ENG. In other words, the disconnecting member 28 may be engaged with the disconnectable component 36 of the input hub 34 before the clutch plates 40 are reengaged. After the disconnecting member 28 is in the second disconnecting position DP2, reengaging the clutch plates 40 allows the input member 20 and the output member 30 to be smoothly rotatably coupled, thereby allowing torque to be transmitted through the other of the first gear ratio 14 and the second gear ratio 16. Figure 3The shift schedule in is indicated by the element A allowing the torque to be transmitted through one of the first gear ratio 14 and the second gear ratio 16 , and by the element G allowing the torque to be transmitted through the other of the first gear ratio 14 and the second gear ratio 16 .

[0079] It will be appreciated that one of the first gear ratio 14 and the second gear ratio 16 can be the first gear ratio 14 or the second gear ratio 16. It will also be appreciated that the other of the first gear ratio 14 and the second gear ratio 16 can be the first gear ratio 14 or the second gear ratio 16. In other words, the selectable one-way clutch 26 can be configured to transmit torque through the first gear ratio 14, or can be configured to transmit torque through the second gear ratio 16. Therefore, the shift assembly 32 can be configured to transmit torque through the corresponding first gear ratio 14 or second gear ratio 16. In an embodiment where the selectable one-way clutch 26 is configured to transmit torque through the first gear ratio 14, the shift assembly 32 is configured to transmit torque through the second gear ratio 16. Alternatively, in an embodiment where the selectable one-way clutch is configured to transmit torque through the second gear ratio 16, the shift assembly 32 is configured to transmit torque through the first gear ratio 14. It will also be appreciated that the torque increase or torque reduction through the first gear ratio 14 can be greater or can be less than the torque increase or torque reduction through the second gear ratio 16.

[0080] The present invention has been described in an illustrative manner, and it should be understood that the terms used are intended to have the nature of descriptive words rather than the nature of restrictive words. In view of the above teachings, many modifications and variations of the present invention are feasible, and the present invention can be practiced in ways other than the specific description.

Claims

1. A shifting system for a vehicle transmission having a gear set, the gear set including a first gear ratio and a second gear ratio different from the first gear ratio, the shifting system comprising: an input member extending along an axis between a first end and a second end spaced apart from the first end, wherein the input member is rotatable about the axis; a selectable one-way clutch rotatably coupled to the input member, wherein the selectable one-way clutch is movable between, a first clutch position in which the selectable one-way clutch is configured to allow torque to be transmitted from the input member through one of the first gear ratio and the second gear ratio of the gear set in a first rotational direction or a second rotational direction opposite the first rotational direction; a second clutch position in which the selectable one-way clutch is configured to allow torque to be transmitted from the input member through one of the first gear ratio and the second gear ratio of the gear set in the first rotational direction and to prevent torque from being transmitted from the input member through one of the first gear ratio and the second gear ratio of the gear set in the second rotational direction; and a third clutch position in which the selectable one-way clutch is configured to prevent transmission of torque from the input member through one of the first gear ratio and the second gear ratio of the gear set in either the first rotational direction or the second rotational direction; a disconnect member coupled to the input member and movable between a first disconnect position and a second disconnect position; an output member spaced apart from the input member, the output member being selectively rotatable with the input member about the axis; as well as A shift assembly, the shift assembly being used for selectively and rotatably coupling the input member and the output member, the shift assembly comprising; an input hub coupled to the input member, wherein the input hub has a disconnectable component engageable with the disconnect, wherein the disconnectable component of the input hub is disengaged from the disconnect when the disconnect is in the first disconnect position, and wherein the disconnectable component of the input hub is engaged with the disconnect when the disconnect is in the second disconnect position, and wherein the input hub has a clutch engagement component; a plurality of clutch plates coupled to the clutch engagement member of the input hub, wherein the plurality of clutch plates are movable between an engaged position in which the clutch plates are engaged with one another and a disengaged position in which the clutch plates are disengaged from one another; as well as A clutch plate carrier is coupled to the plurality of clutch plates and the output member so as to transmit torque from the clutch engaging part of the input hub to the output member through the plurality of clutch plates and the clutch plate carrier.

2. The gear shifting system according to claim 1, wherein: The selectable one-way clutch has an inner race and an outer race disposed around the inner race.

3. The gear shifting system according to claim 2, wherein: The inner race and the outer race of the selectable one-way clutch are disposed about and axially aligned with the input member.

4. The gear shifting system according to any one of claims 2 and 3, wherein: The inner race of the selectable one-way clutch is rotatably coupled to the input member.

5. The gear shifting system according to any one of claims 2 and 3, wherein: The selectable one-way clutch has at least one pawl disposed between the inner race and the outer race.

6. The gear shifting system according to claim 5, wherein: The at least one pawl is further defined as a plurality of pawls circumferentially spaced apart from one another, and wherein the selectable one-way clutch further comprises an actuator ring coupled to the plurality of pawls for selectively rotatably locking the inner race and the outer race together.

7. The gear shifting system according to any one of claims 1 to 3, wherein: The shift assembly also includes a biasing member coupled to the plurality of clutch plates to bias the plurality of clutch plates toward the engaged position.

8. The gear shifting system according to any one of claims 1 to 3, wherein: The selectable one-way clutch is also movable to a fourth position in which the selectable one-way clutch is configured to allow torque to be transmitted from the input member in the second rotational direction through one of the first gear ratio and the second gear ratio of the gear set, and to prevent torque from being transmitted from the input member in the first rotational direction through one of the first gear ratio and the second gear ratio of the gear set.

9. A vehicle transmission, comprising a gear shifting system according to any one of claims 2 and 3, wherein: The vehicle transmission also includes the gear set including the first gear ratio and the second gear ratio different from the first gear ratio.

10. The vehicle transmission of claim 9, further comprising a countershaft spaced from the input member and rotatable about the axis, wherein the selectable one-way clutch is configured to transmit torque from the input member to the countershaft through the first gear ratio.

11. The vehicle transmission according to claim 10, wherein: The inner race and the outer race of the selectable one-way clutch are disposed about and axially aligned with the layshaft.

12. The vehicle transmission according to claim 10, wherein: The shift assembly is configured to transfer torque from the output member to the countershaft through the second gear ratio.

13. A method for operating a gear shift system according to any one of claims 1 to 3, the method comprising the following steps: moving the selectable one-way clutch from a first clutch position, wherein the selectable one-way clutch is configured to allow torque to be transmitted from the input member through one of the first gear ratio and the second gear ratio in a first rotational direction or a second rotational direction opposite the first rotational direction, to a second clutch position, wherein the selectable one-way clutch is configured to allow torque to be transmitted from the input member through one of the first gear ratio and the second gear ratio in the first rotational direction and prevent torque from being transmitted from the input member through one of the first gear ratio and the second gear ratio in the second rotational direction; moving the plurality of clutch plates from an engaged position, in which the clutch plates are engaged with one another, to a disengaged position, in which the clutch plates are disengaged from one another; moving the disconnect member from a first disconnect position, in which the disconnectable component of the input hub is disengaged from the disconnect member, to a second disconnect position, in which the disconnectable component of the input hub is engaged with the disconnect member; and The selectable one-way clutch is moved from the second clutch position to a third clutch position in which the selectable one-way clutch is configured to prevent torque from being transmitted from the input member through one of the first gear ratio and the second gear ratio in the first rotational direction or the second rotational direction so as to convert torque from being transmitted from the input member through one of the first gear ratio and the second gear ratio to torque from being transmitted from the input member through the other of the first gear ratio and the second gear ratio.

14. The method according to claim 13, in, The step of moving the selectable one-way clutch from the first clutch position to the second clutch position precedes the step of moving the plurality of clutch plates from the engaged position to the disengaged position.

15. The method according to claim 14, in, The step of moving the plurality of clutch plates from the engaged position to the disengaged position precedes the step of moving the disconnect member from the first disconnected position to the second disconnected position.

16. The method according to any one of claims 13 and 14, in, The step of moving the disconnect member from the first disconnected position to the second disconnected position precedes the step of moving the selectable one-way clutch from the second clutch position to the third clutch position.

17. The method according to any one of claims 13 and 14, in, The method further includes the step of moving the plurality of clutch plates from the disengaged position to the engaged position.

18. The method according to claim 17, The step of moving the disconnect member from the first disconnect position to the second disconnect position precedes the step of moving the plurality of clutch plates from the disengaged position to the engaged position.

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