Gear selection actuator for shift-by-wire systems

Abstract

A shift actuator for a transmission includes a drive assembly coupled with a selector interface. The transmission selector operates between a plurality of transmission settings. A threaded actuator is rotatably operated by the drive assembly. A carriage operates linearly along the threaded actuator to define a plurality of actuator positions corresponding to the transmission settings. An actuator arm extends between the carriage and the transmission selector to translate linear motion of the carriage into rotational motion of the transmission selector.

Description

[Technical Field]

[0001] The device is in the field of selection mechanisms, and more specifically is an actuator for a gear selection mechanism that can be used to adjust a transmission via a shift-by-wire selection interface. [Background technology]

[0002] In conventional vehicles, the transmission includes multiple gears to change the vehicle's operating characteristics. These transmissions often use mechanical transmissions that are manually shifted through the use of an operating system. Additionally, shift-by-wire mechanisms can be used to adjust the gear settings of the transmission using a digital interface. Within a shift-by-wire interface, an actuator is typically used to change the gear selected for the transmission. Summary of the Invention

[0003] According to a first aspect of the present disclosure, a shift actuator for a transmission includes a drive assembly coupled to a selector interface. The transmission selector operates among a plurality of transmission settings. A threaded actuator is rotatably operated by the drive assembly. A carriage moves linearly along the threaded actuator to define a plurality of actuator positions corresponding to the transmission settings. An actuator arm extends between the carriage and the transmission selector to convert linear movement of the carriage into rotational movement of the transmission selector.

[0004] According to another aspect of the present disclosure, a gear selector assembly includes a selector interface for selectively operating a drive assembly having a threaded actuator. A carriage moves linearly along a rotational axis of the threaded actuator to define a plurality of actuator positions. An actuator arm extends between the carriage and a transmission interface. Linear movement of the carriage defines rotational movement of the actuator arm about the transmission interface. A position sensor communicates with the selector interface, the actuator arm, and a motor of the drive assembly to position the carriage and the actuator arm at the plurality of actuator positions. A transmission selector is included, and linear movement of the carriage along the threaded actuator defines a plurality of actuator positions corresponding to respective gear positions of the transmission selector.

[0005] According to another aspect of the present disclosure, the selector assembly includes a selector interface that selectively operates the drive assembly via a controller. The drive assembly includes a threaded actuator. The carriage translates along the threaded actuator to define a plurality of gear positions. The transmission selector rotates about an interface axis. The sensor assembly is in communication with the controller and the carriage. Linear movement of the carriage defines rotational movement of a magnet of the sensor assembly and the transmission selector about the interface axis. The sensor assembly cooperates with the drive assembly to position the carriage and the transmission selector at a selected one of the plurality of gear positions.

[0006] These and other aspects, objects, and features of the present disclosure will be understood and appreciated by those skilled in the art upon review of the following specification, claims, and accompanying drawings. [Brief explanation of the drawings]

[0007] The following is the drawing.

[0008] [Figure 1] FIG. 1 is a perspective view of a selector interface for an exemplary vehicle. [Figure 2] FIG. 1 is a perspective view of an exemplary selector actuator for use with a selector interface and a shift-by-wire transmission. [Figure 3] FIG. 3 is another perspective view of the selector actuator of FIG. 2. [Figure 4] FIG. 3 is an exploded perspective view of the selector actuator of FIG. 2. [Figure 5] FIG. 10 is an exploded perspective view of an actuation assembly for the selector actuator. [Figure 6] 6 is a cross-sectional view of the selector actuator of FIG. 3 taken along line VI-VI. [Figure 7] FIG. 1 is a perspective view of the actuator assembly shown in a first transmission setting. [Figure 8] FIG. 8 is a perspective view of the actuator assembly of FIG. 7 shown in a second transmission setting. [Figure 9] FIG. 9 is a perspective view of the actuator assembly of FIG. 8 shown in a third transmission setting. DETAILED DESCRIPTION OF THE INVENTION

[0009] Additional features and advantages of the present disclosure will be set forth in the following detailed description, and will become apparent to those skilled in the art from the description, or may be learned by practicing the invention as set forth in the following description, taken in conjunction with the claims and accompanying drawings.

[0010] As used herein, the term "and / or," when used in a list of two or more items, means that any one of the listed items can be employed alone, or any combination of two or more of the listed items can be employed. For example, if a composition is described as including components A, B, and / or C, the composition can include A only, B only, C only, a combination of A and B, a combination of A and C, a combination of B and C, or a combination of A, B, and C.

[0011] In this document, relational terms such as first and second, top and bottom, etc. are used solely to distinguish one entity or action from another without necessarily requiring or implying any such actual relationship or order between such entities or actions.

[0012] For purposes of this disclosure, the term "coupled" (in all its forms, such as couple, coupling, coupled, etc.) generally means joining two components (electrical or mechanical) to one another, directly or indirectly. Such joining may be fixed or movable in nature. Such joining may be achieved by the two components (electrical or mechanical) and / or any additional intermediate members. Such joining may include members integrally formed with one another as a single, cohesive body (i.e., integrally joined), or may refer to the joining of two components. Such joining may be detachable or releasable in nature, unless otherwise indicated.

[0013] As used herein, the terms "substantial," "substantially," and variations thereof are intended to note that a described characteristic is equal or nearly equal to a value or description. For example, a "substantially planar" surface is intended to describe a surface that is planar or nearly planar. Furthermore, "substantially" is intended to describe two values ​​that are equal or nearly equal. In some embodiments, "substantially" can describe values ​​that are within about 10% of each other, such as within about 5% of each other or within about 2% of each other.

[0014] As used herein, the terms "the," "a," or "an" mean "at least one" and should not be limited to "only one" unless expressly indicated to the contrary. Thus, for example, reference to "a component" includes embodiments having two or more such components, unless the context clearly indicates otherwise.

[0015] 1-9, reference numeral 10 generally refers to a shift actuator that may include a selector actuator 12 for making various adjustments to a mechanical assembly, such as a transmission 14. The selector actuator 12 is configured to receive commands from a selector interface 16. The commands from the selector interface 16 operate the selector actuator 12 to move the mechanical assembly between various selected positions, such as gear positions 18, of a plurality of possible positions. According to various aspects of the device, the shift actuator 10 for the transmission 14 includes a drive assembly 20 coupled to the selector interface 16. A transmission selector 22 operates between a plurality of transmission settings 24. A threaded actuator 26 is rotatably operated by the drive assembly 20. A carriage 28 moves linearly along the threaded actuator 26 to define a plurality of actuator positions 30 corresponding to the plurality of transmission settings 24. An actuator arm 32 extends between the carriage 28 and the transmission selector 22. The actuator arm 32 operates to convert linear motion 34 of the carriage 28 into rotational motion 36 of the actuator arm 32 and transmission selector 22. Thus, the actuator arm 32 and transmission selector 22 each move about an interface axis 38 of the transmission selector 22.

[0016] 2-9 , the actuator arm 32 for the shift actuator 10 includes a positioning magnet 50 that operates relative to a position sensor 52 that is in communication with the drive assembly 20. The positioning magnet 50 and the position sensor 52 cooperate to selectively operate one or more motors 54 of the drive assembly 20 to define the multiple transmission settings 24. The position sensor 52 may be incorporated into a printed circuit board (PCB) 56. The drive assembly 20, carriage 28, positioning magnet 50, and position sensor 52 are each disposed within an outer housing 58, such as within a motor cavity 60 of the outer housing 58. Typically, the PCB 56 may be attached to a portion of the outer housing 58 or held in a stable position within the motor cavity 60, such that the carriage 28, actuator arm 32, positioning magnet 50, and other components of the shift actuator 10 operate within the motor cavity 60 of the outer housing 58.

[0017] The drive assembly 20 for the shift actuator 10 may include one or more motors 54 that operate the threaded actuator 26. As illustrated in Figures 2-9, the drive assembly 20 includes a single bi-directional motor 54 that can rotate the threaded actuator 26 in a clockwise and counterclockwise direction about an axis of rotation 70 of the threaded actuator 26. It is also contemplated that the drive assembly 20 may include multiple motors 54, such as two uni-directional motors 54, for operating the threaded actuator 26 in a clockwise and counterclockwise direction, respectively, about the axis of rotation 70 of the threaded actuator 26.

[0018] 4-9, drive assembly 20 may also include a gear train 80 extending between motors 54 and threaded actuator 26. This gear train 80 may include one or more drive gears 82 attached to a drive shaft 84 of each motor 54. In addition, threaded actuator 26 may include a separate operating gear 86 that meshes with drive gear 82. Gear train 80 may include various idler gears that may be positioned within gear train 80.

[0019] In various embodiments of the device, as illustrated in FIGS. 4-9 , the drive gear 82 and the operating gear 86 can have different sizes to define a gear reduction mechanism 100 within the drive assembly 20 for the shift actuator 10. This gear reduction mechanism 100 can be used to increase the speed of the carriage 28 or to increase the mechanical advantage of the motor 54 to drive the carriage 28 along the threaded actuator 26 to define the multiple actuator positions 30 of the shift actuator 10. As illustrated in FIGS. 4-9 , the drive gear 82 is smaller than the operating gear 86 such that the operating gear 86 moves at a lower rotational speed than the drive gear 82. This difference in size between the operating gear 86 and the drive gear 82 increases the output torque 102 at the operating gear 86 to rotate the threaded actuator 26 and cause the carriage 28 to perform linear motion 34. Through this configuration, the motor 54 can be a relatively low power motor 54 due to the mechanical advantage gained through the difference in size between the drive gear 82 and the operating gear 86 for the gear train 80 .

[0020] 4-9, the carriage 28 and the actuator arm 32 slidably move relative to one another through the use of a receiver 110 and protrusion combination. The receiver 110 includes an elongated opening 114 or slot that allows the protrusion 112 to move within the receiver 110. During movement of the carriage 28 and the actuator arm 32, the protrusion 112 is limited to movement relative to the carriage 28 in a direction generally perpendicular to the linear movement 34 of the carriage 28. In this manner, the protrusion 112 can smoothly translate within the opening 114 of the receiver 110. Typically, the protrusion 112 is positioned on the actuator arm 32 and the receiver 110 is defined within the carriage 28, although these positions can be switched.

[0021] 4-9 , the elongated opening 114 of the receiver 110 provides linear motion 34 of the carriage 28 relative to the projection 112 in combination with rotational motion 36 of the actuator arm 32. In other words, as the carriage 28 undergoes linear motion 34 along the threaded actuator 26, the actuator arm 32, and therefore the projection 112, moves in rotational motion 36 through an arcuate path about an interface axis 38 of the transmission selector 22. Through this interface between the projection 112 and the receiver 110, the actuator arm 32 can be secured to the carriage 28. This positive engagement provides a smooth transition from the linear motion 34 of the carriage 28 to the rotational motion 36 of the actuator arm 32. The use of the actuator arm 32 extending between the carriage 28 and the transmission selector 22 provides an additional mechanical advantage within the shift actuator 10. As carriage 28 undergoes linear motion 34 along threaded actuator 26, actuator arm 32 has a radial length that serves to provide additional mechanical advantage between carriage 28 and transmission selector 22. Thus, the multiple mechanical advantages provided within shift actuator 10 allow motor 54 to be significantly reduced in size while still providing the output torque 102 required to operate gear train 80, threaded actuator 26, carriage 28, actuator arm 32, and transmission selector 22 to operate transmission 14.

[0022] According to various aspects of the device, as illustrated in FIGS. 1-9 , the shift actuator 10 and transmission selector 22 are operatively coupled or engaged with a shift-by-wire mechanism 120 for manipulating the gear positions 18 of the transmission 14. Specifically, the shift-by-wire mechanism 120 receives commands via movement of the shift actuator 10 and transmission selector 22, which in turn actuates a separate mechanical assembly for operating the transmission 14 between the various gear positions 18. According to various aspects of the device, it is contemplated that the shift actuator 10 may be attached directly to the mechanical assembly to operate the transmission 14 in the absence of the shift-by-wire mechanism 120. Typically, the shift-by-wire mechanism 120 is utilized in combination with the shift actuator 10 to operate the transmission 14 between the various gear positions 18. The multiple transmission settings 24 corresponding to the various gear positions 18 of the transmission 14 may include at least a reverse position 122, a neutral position 124, and a drive position 126. Additional transmission settings 24 may be included for alternate drive settings, transmission settings 24 for different road and weather conditions, and other like transmission settings 24. In certain aspects of the device, the shift actuator 10 may also include a park position 128 as one of the transmission settings 24. It is also contemplated that the park setting may also be actuated through the use of a separate assembly dedicated to actuating the park position 128 of the transmission 14. This dedicated assembly may also be utilized for the shift-by-wire mechanism 120 and the park lock setting of the transmission 14.

[0023] 7-9 , as discussed herein, the drive assembly 20 operates to rotate the threaded actuator 26 about a rotational axis 70. During rotation of the threaded actuator 26, the carriage 28 translates along the rotational axis 70 of the threaded actuator 26 through a linear motion 34. The linear motion 34 of the carriage 28 is used to define a plurality of actuator positions 30 corresponding to the transmission settings 24. The linear motion 34 of the carriage 28 is translated into a rotational motion 36 of the actuator arm 32 about an interface axis 38 of the transmission selector 22. A positioning magnet 50 attached to the actuator arm 32 also rotates about the interface axis 38 during operation of the drive assembly 20 and carriage 28 for the shift actuator 10. As the actuator arm 32 rotates, the positioning magnet 50 interacts with a position sensor 52 to communicate the position of the positioning magnet 50 relative to the position sensor 52, and in turn, the position of the actuator arm 32.

[0024] 1-9 , after a selection is made using the selector interface 16, the drive assembly 20 is actuated to translate the carriage 28 along the rotational axis 70 of the threaded actuator 26. During this translation of the carriage 28, the positioning magnet 50 moves about the interface axis 38 of the transmission selector 22. When the positioning magnet 50 reaches a desired position corresponding to a selected actuator position 140 of the carriage 28 that corresponds to the desired transmission setting 24 for the selector interface 16, the position sensor 52 communicates with the drive assembly 20 via the controller 142 to stop operation of the motor 54 of the drive assembly 20. Using the positioning magnet 50 and the position sensor 52, discrete movements of the actuator arm 32 can be detected, thereby achieving precise positioning of the carriage 28, the actuator arm 32, and the transmission selector 22 for operating the shift-by-wire mechanism 120. Thus, the discrete movements of the actuator arm 32 can be translated into corresponding discrete rotations of the transmission selector 22 for operating the shift-by-wire mechanism 120. The use of discrete, incremental movements of the carriage 28, actuator arm 32, and transmission selector 22 allows for a relatively compact size of the shift actuator 10. Because the components of the selector actuator 12 move less, the amount of space required to accommodate the various paths of movement within the motor cavity 60 is minimized. The mechanical advantages described herein allow for this reduction in size of the shift actuator 10 without sacrificing output torque 102 at the transmission selector 22.

[0025] 4-6 , the outer housing 58 of the shift actuator 10 may include a guide portion 150 that maintains the carriage 28 in a fixed rotational position as the carriage 28 translates along the rotational axis 70 of the threaded actuator 26. This guide portion 150 helps guide the translation of the carriage 28 in its linear motion 34 and through the plurality of actuator positions 30. This guide portion 150 may include a series of grooves or channels 152 defined in the outer housing 58. The carriage 28 may also include various tabs 154 or sliding features that interact with the channels 152 defined in the outer housing 58 that serve as the guide portion 150 of the outer housing 58. The guide portions 150 defined in the outer housing 58 and the carriage 28 help ensure smooth linear motion 34 of the carriage as the carriage 28 translates along the rotational axis 70 of the threaded actuator 26. Additionally, the guide portion 150 ensures that the carriage 28 does not undergo any eccentric rotational movement, thereby confining it to linear movement 34 along the rotational axis 70 of the threaded actuator 26. Confining the carriage 28 to only linear movement 34 in this manner helps ensure precise movement of the actuator arm 32 and positioning magnet 50 during operation of the shift actuator 10.

[0026] 2-6 , within the outer housing 58, the transmission selector 22 is secured within an interface portion 160 of the outer housing 58. The interface portion 160 helps position the transmission selector 22 and the actuator arm 32 for rotatable movement about the interface axis 38 of the transmission selector 22. Accordingly, the interface portion 160 of the outer housing 58 may include a hub 162 that at least partially surrounds the transmission selector 22. Additionally, it is contemplated that the actuator arm 32 and the transmission selector 22 may be a single piece. It is also contemplated that the actuator arm 32 and the transmission selector 22 may be separate components attached together for movement about the interface axis 38 defined by the interface portion 160 of the outer housing 58 and the transmission selector 22.

[0027] 1-9 , a gear selector assembly 170 for a vehicle includes a selector interface 16 that selectively operates a drive assembly 20 having a threaded actuator 26. A carriage 28 translates through linear motion 34 along a rotational axis 70 of the threaded actuator 26 to define a plurality of actuator positions 30. As discussed above, the carriage 28 is limited to linear motion 34 to prevent movement in a rotational direction or in a direction outward or distal to the rotational axis 70 of the threaded actuator 26. An actuator arm 32 extends between the carriage 28 and a transmission interface 180. The linear motion 34 of the carriage 28 defines a rotational motion 36 of the actuator arm 32 about an interface axis 38 of the transmission selector 22. As discussed above, the transmission selector 22 and the actuator arm 32 may be separate components or may be a single, integrated part that moves simultaneously about the interface axis 38 of the transmission selector 22. A transmission interface 180 may be defined by the engagement between the transmission selector 22 and the shift-by-wire mechanism 120. The transmission interface 180 receives the rotational movement 36 of the actuator arm 32 and the transmission selector 22 and converts the rotational movement 36 into commands to operate the transmission 14 for the vehicle. The movement of the transmission selector 22 may be a relatively finite and discrete movement that operates the shift-by-wire mechanism 120 and can then be converted into digital or electrical commands to operate the transmission 14 for the vehicle.

[0028] 4-9 , the position sensor 52 of the shift actuator 10 communicates with the selector interface 16, actuator arm 32, and motor 54 of the drive assembly 20 to position the carriage 28 and actuator arm 32 at a desired one of the plurality of actuator positions 30. The transmission selector 22 is also included within the shift actuator 10 of the gear selector assembly 170. Linear movement 34 of the carriage 28 along the threaded actuator 26 defines the plurality of actuator positions 30 corresponding to respective gear positions 18 of the transmission selector 22. As discussed above, the position sensor 52 includes or is paired with a positioning magnet 50 that operates relative to a magnetic sensor 190 of the position sensor 52. This magnetic sensor 190 of the position sensor 52 communicates with the controller 142 and the drive assembly 20. The positioning magnet 50 and the position sensor 52 cooperate to selectively operate the motor 54 of the drive assembly 20 to define the plurality of transmission settings 24. The positioning magnet 50 of the sensor assembly 220 is typically attached to the actuator arm 32 and rotates about the interface axis 38. Movement of this positioning magnet 50, in cooperation with a position sensor 52, typically in the form of a magnetic sensor 190, provides positioning information about the carriage 28 and actuator arm 32. This positioning information is used to operate the drive assembly 20 to define various transmission settings 24 of the transmission selector 22 and transmission interface 180.

[0029] According to various aspects of the device, the outer housing 58 includes a connection terminal 210 that receives a connector 212 for providing power to the drive assembly 20. Data communications are also included within the connector 212 and connection terminal 210 for exchanging data and positioning information with the controller 142 for the transmission 14 and shift-by-wire mechanism 120. From the exterior of the outer housing 58, the only portion of the shift actuator 10 that exhibits movement is the transmission selector 22, which engages the shift-by-wire mechanism 120 at the transmission interface 180. All other operable components of the shift actuator 10 are contained and housed within the motor cavity 60 of the outer housing 58. Through this configuration, the shift actuator 10 for the gear selector assembly 170 can be kept free of dust, debris, and other contaminants. By enclosing the threaded actuator 26, carriage 28, and actuator arm 32 within the outer housing 58, the linear motion 34 of the carriage 28 and the rotational motion 36 of the actuator arm 32 can be maintained for extended periods of time because the amount of contaminants that can enter the motor cavity 60 is minimized.

[0030] 2-6 , the connection terminals 210 engage the PCB 56 to deliver power and to send and receive various data regarding the status of the shift actuator 10. To deliver power to the motor 54, the motor 54 includes motor pins 270 that engage connection pins 272 that extend to the PCB 56. During manufacture of the shift actuator 10, the motor 54 can be positioned relative to the outer housing 58. The motor pins 270 of the motor 54 can be press-fit or press-fit and welded / soldered to the connection pins 272 of the PCB 56. The retainer 240 can then be positioned to secure the motor 54 and other components of the shift actuator 10 within the outer housing 58. The motor 54 can also include a positioning feature 274 that engages a portion of the shift actuator 10, such as the outer housing 58, to secure the motor 54 within the motor cavity 60.

[0031] Referring again to FIGS. 4-6 , the outer housing 58 may include opposing housing portions 280 attached together to define the outer housing 58. To prevent foreign matter from entering the motor cavity 60, the opposing housing portions 280 may include a peripheral gasket 282 positioned therebetween. In addition, the hub 162 of the outer housing 58 may include an inner gasket 284 or O-ring positioned on the transmission selector 22. The inner gasket 284 and the peripheral gasket 282 serve to seal the motor cavity 60 and prevent foreign matter from entering. The peripheral gasket 282 and the inner gasket 284 also allow the shift actuator to shed fluid or be at least partially immersed in the lubricating fluid of a mechanical assembly. In this manner, the shift actuator 10 may be present in a fluid environment while preventing fluid or other foreign matter from entering the motor cavity 60 of the outer housing 58.

[0032] According to various embodiments of the device, the degree of rotational movement 36 of the actuator arm 32 typically depends on the length of the threaded actuator 26 and the linear path of travel of the carriage 28 along the threaded actuator 26. As such, the amount of rotational movement 36 experienced by the actuator arm 32 may be approximately 45 degrees between the outermost actuator positions 30 of the plurality of actuator positions 30. In certain embodiments of the device, the actuator arm 32 may undergo a total rotation of approximately 30 degrees between the outermost positions of the plurality of actuator positions 30. In certain embodiments of the device, the actuator arm 32 may undergo a total rotation of approximately 20 degrees between the outermost positions of the plurality of actuator positions 30. In certain embodiments of the device, the actuator arm 32 may undergo a total rotation of approximately 15 degrees between the outermost positions of the plurality of actuator positions 30. The degree of rotation of the actuator arm 32 is monitored through the use of a sensor assembly 220 incorporating a positioning magnet 50 and a magnetic sensor 190. These components of the sensor assembly 220 can monitor discrete movements of the actuator arm 32 during its rotational movement 36. Therefore, the amount of rotation required of the transmission selector 22 to communicate with the shift-by-wire mechanism 120 can be kept small to distinguish between various ones of the plurality of gear positions 18. Because only limited movement may be required of the actuator arm 32, the size of the shift actuator 10 can be kept relatively small, thereby minimizing the amount of space occupied by the shift actuator 10 and the shift-by-wire mechanism 120 for the transmission 14.

[0033] 1-9 , selector assembly 170 includes selector interface 16 that selectively operates drive assembly 20 via controller 142. Drive assembly 20 includes threaded actuator 26. Carriage 28 translates along threaded actuator 26 to define a plurality of gear positions 18. Transmission selector 22 rotates about interface axis 38. Sensor assembly 220 is in communication with controller 142 and carriage 28. Linear movement 34 of carriage 28 defines rotational movement 36 of sensor assembly 220 and positioning magnet 50 of transmission selector 22 about interface axis 38. Sensor assembly 220 cooperates with drive assembly 20 to position carriage 28 and transmission selector 22 at a desired or selected gear position 230 among the plurality of gear positions 18. As discussed herein, the positioning magnet 50 for the sensor assembly 220 is typically mounted to the actuator arm 32 extending between the carriage 28 and the transmission selector 22. Again, linear motion 34 of the carriage 28 is translated into rotational motion 36 of the transmission selector 22 via rotational motion 36 of the actuator arm 32. A PCB 56 mounted to the outer housing 58 and / or housed within the motor cavity 60 may include a position sensor 52 that cooperates with the positioning magnet 50 mounted to the actuator arm 32, typically in the form of a magnetic sensor 190. Information from the position sensor 52 is communicated to the drive assembly 20 via the controller 142 for the shift actuator 10.

[0034] According to various aspects of the device, the drive assembly 20 and the threaded actuator 26 can include various retainers 240 that maintain the axial position of the drive assembly 20 and the threaded actuator 26. These retainers 240 can be coupled to the outer housing 58 to secure the components of the shift actuator 10 within the outer housing 58. These retainers 240 can include caps that engage with the threaded actuator 26, various portions of the gear train 80, and other portions of the drive assembly 20 to enable rotational movement 36 of these components while maintaining axial and lateral positioning. Lubricants, bearings, and other low-friction interfaces can be incorporated within these retainers 240.

[0035] According to various aspects of the device, the shift actuator 10 provides a compact, rotary-based shift actuator 10 that efficiently transfers force or output torque 102 from the motor 54 to the transmission selector 22. Various mechanical advantages are achieved through the gear train 80 and moment arms defined by the actuator arm 32 extending between the carriage 28 and the transmission selector 22. The shift actuator 10 operates to drive the transmission 14 to shift between a plurality of gear positions 18. The shift actuator 10 provides shift commands such that the shift-by-wire mechanism 120 can rapidly drive the transmission 14 to operate to a corresponding selected gear position 230.

[0036] According to various aspects of the device, the shift actuator 10 can be included within a shift-by-wire mechanism 120 and various other selectors incorporated within a vehicle setup. The shift actuator 10 can also be incorporated within other selection interfaces within other mechanical assemblies in non-vehicle applications.

[0037] The outer housing 58 of the shift actuator 10 may include various connection points 250 that may be attached directly to the shift-by-wire mechanism 120, to the transmission 14, or to another component of the vehicle for operating the shift-by-wire mechanism 120. These attachment points serve to securely fasten the outer housing 58 so that the transmission selector 22 can precisely engage the transmission interface 180 between the shift actuator 10 and the shift-by-wire mechanism 120.

[0038] In certain embodiments of the device, the drive assembly 20 can include any one of a variety of motors 54. In one exemplary embodiment of the device, the motor 54 of the drive assembly 20 can include a 12-volt DC motor. As discussed herein, the mechanical advantage provided by the gear reduction mechanism 100 of the gear train 80 and the moment arm provided by the actuator arm 32 can provide a motor 54 with a low power or torque output that can be translated into discrete, precise movement of the carriage 28, the actuator arm 32, and the transmission selector 22. When a shift actuator 10 is used to move the mechanical assemblies of the transmission 14, a larger motor 54 can be utilized to provide a greater amount of power or output torque 102, as desired. Typically, a shift-by-wire mechanism 120 can be used to utilize a relatively small motor 54.

[0039] It is to be understood that changes and modifications can be made to the structure described above without departing from the concepts of the present invention, and further that such concepts are intended to be covered by the following claims unless those claims expressly state otherwise by their language.

Claims

1. A shift actuator for a transmission, the shift actuator comprising: a drive assembly coupled to the selector interface; a transmission selector that operates between multiple transmission settings; a threaded actuator rotatably operated by the drive assembly; a carriage that moves linearly along the threaded actuator to define a plurality of actuator positions corresponding to the transmission settings; an actuator arm extending between the carriage and the transmission selector to convert linear movement of the carriage into rotational movement of the transmission selector; the transmission selector is secured within an interface portion of an outer housing, the interface portion positioning the transmission selector and the actuator arm for rotatable movement about an interface axis of the transmission selector; Shift actuator.

2. 2. The shift actuator of claim 1, wherein the actuator arm includes a positioning magnet operatively coupled to a position sensor in communication with the drive assembly, the positioning magnet and the position sensor cooperating to selectively operate a motor of the drive assembly between the plurality of transmission settings.

3. The shift actuator of claim 2 , wherein the drive assembly, the carriage, the positioning magnet, and the position sensor are disposed within the outer housing.

4. 4. The shift actuator of claim 2 or 3, wherein the position sensor is incorporated into a printed circuit board mounted to the outer housing.

5. The shift actuator of claim 2 wherein said drive assembly includes a gear train extending between said motor and said threaded actuator.

6. A shift actuator according to any preceding claim, wherein the drive assembly includes a single bi-directional motor.

7. A shift actuator according to any preceding claim, wherein the drive assembly includes two single direction motors.

8. The shift actuator of any one of claims 1 to 7, wherein the carriage and the actuator arm are slidably movable relative to one another to convert the linear movement of the carriage into the rotational movement of the actuator arm.

9. The shift actuator of any one of claims 1 to 7, wherein the outer housing includes a guide portion that maintains the carriage in a fixed rotational position and guides translation of the carriage through the plurality of actuator positions.

10. A shift actuator according to any preceding claim, wherein the actuator arm and the transmission selector are a single component.

11. The shift actuator of any one of claims 1 to 10, wherein the plurality of transmission settings includes at least a reverse position, a neutral position, and a drive position.

12. A shift actuator according to any preceding claim, wherein the actuator arm and the transmission selector are attached together to form a single part.

13. A shift actuator according to any preceding claim, wherein the transmission selector is operably coupled to a shift-by-wire mechanism.

14. The shift actuator of claim 11 , wherein the plurality of transmission settings includes a park position.

15. 1. A gear selector assembly comprising: a selector interface for selectively operating a drive assembly having a threaded actuator; a carriage that moves linearly along the axis of rotation of the threaded actuator to define a plurality of actuator positions; an actuator arm extending between the carriage and a transmission interface, wherein linear movement of the carriage defines rotational movement of the actuator arm about the transmission interface; a position sensor in communication with the selector interface, the actuator arm, and the drive assembly motor for positioning the carriage and the actuator arm at the plurality of actuator positions; a transmission selector, wherein the linear movement of the carriage along the threaded actuator defines a plurality of actuator positions corresponding to respective gear positions of the transmission selector; the transmission selector is secured within an interface portion of an outer housing, the interface portion positioning the transmission selector and the actuator arm for rotatable movement about an interface axis of the transmission selector; Gear selector assembly.

16. 16. The gear selector assembly of claim 15, wherein the position sensor includes a positioning magnet operative relative to a magnetic sensor in communication with the drive assembly, the positioning magnet and the position sensor cooperating to selectively operate a motor of the drive assembly between a plurality of transmission settings.

17. 17. A gear selector assembly according to claim 16, wherein the positioning magnet is mounted to the actuator arm and the magnetic sensor is mounted to a printed circuit board.

18. A gear selector assembly according to any one of claims 15 to 17, wherein the drive assembly, the carriage, and the position sensor are disposed within a motor cavity in the outer housing.

19. 18. The gear selector assembly of claim 17, wherein the printed circuit board is mounted to an outer housing.

20. A gear selector assembly according to claim 16 or 17, wherein the drive assembly includes a gear train extending between the motor and the threaded actuator.

21. A gear selector assembly according to any one of claims 15 to 20, wherein the drive assembly includes a single bi-directional motor.

22. A gear selector assembly according to any one of claims 15 to 21, wherein the carriage and the actuator arm are slidably movable relative to one another to translate the linear movement of the carriage into the rotational movement of the actuator arm.

23. 19. The gear selector assembly of claim 18, wherein the outer housing includes a guide portion that maintains the carriage in a fixed rotational position and guides translation of the carriage through the plurality of actuator positions.

24. A gear selector assembly according to any one of claims 15 to 23, wherein the actuator arm and the transmission selector are a single piece.

25. A gear selector assembly according to any one of claims 15 to 24, wherein the respective gear positions include at least a reverse position, a neutral position, and a drive position.

26. A gear selector assembly according to any one of claims 15 to 23, wherein the actuator arm and the transmission selector are attached together to form a single part.

27. A gear selector assembly according to any one of claims 15 to 26, wherein the transmission selector is operatively coupled to a shift-by-wire mechanism.

28. 26. The gear selector assembly of claim 25, wherein the respective gear positions include a park position.

29. 1. A selector assembly comprising: a selector interface for selectively operating a drive assembly via a controller, the drive assembly including a threaded actuator; a carriage that translates along the threaded actuator to define a plurality of gear positions; a transmission selector that rotates about an interface axis; a sensor assembly in communication with the controller and the carriage, wherein linear movement of the carriage defines rotational movement of a magnet of the sensor assembly and the transmission selector about the interface axis, the sensor assembly cooperating with the drive assembly to position the carriage and the transmission selector at a selected one of the plurality of gear positions; the transmission selector is secured within an interface portion of an outer housing, the interface portion positioning the transmission selector and actuator arm for rotatable movement about an interface axis of the transmission selector; Selector assembly.

30. 30. The selector assembly of claim 29, wherein the sensor assembly includes a magnet operative relative to a position sensor in communication with the drive assembly, the magnet and the position sensor cooperating to selectively operate a motor of the drive assembly between the plurality of gear positions.

31. 31. The selector assembly of claim 30, wherein the magnet is mounted to the actuator arm and the position sensor is mounted to a printed circuit board.

32. The selector assembly of any one of claims 29 to 31, wherein the drive assembly, the carriage, and the sensor assembly are disposed within a motor cavity of the outer housing.

33. The selector assembly of claim 31 , wherein the printed circuit board is mounted to an outer housing.

34. The selector assembly of claim 30, wherein the drive assembly includes a gear train extending between the motor and the threaded actuator.

35. A selector assembly according to any one of claims 29 to 34, wherein the drive assembly includes a single bi-directional motor.

36. 32. The selector assembly of claim 31, wherein said carriage and said actuator arm are slidably movable relative to one another to translate said linear movement of said carriage into said rotational movement of said actuator arm.

37. 33. The selector assembly of claim 32, wherein said outer housing includes a guide portion that maintains said carriage in a fixed rotational position and guides translation of said carriage through said plurality of gear positions.

38. A selector assembly according to any one of claims 29 to 37, wherein the actuator arm and the transmission selector are a single piece.

39. A selector assembly according to any one of claims 29 to 38, wherein the plurality of gear positions includes at least a reverse position, a neutral position, and a drive position.

40. A selector assembly according to any one of claims 29 to 37, wherein the actuator arm and the transmission selector are attached together to form a single part.

41. A selector assembly according to any one of claims 29 to 40, wherein the transmission selector is operatively coupled to a shift-by-wire mechanism.

42. 40. The selector assembly of claim 39, wherein said plurality of gear positions includes a park position.

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