Multi-mode integrated starter-generator device with cam device
阅读说明:本技术 带有凸轮装置的多模式集成式启动机-发电机装置 (Multi-mode integrated starter-generator device with cam device ) 是由 史蒂文·R·弗莱尔曼 莉萨·R·劳埃德 于 2020-04-08 设计创作,主要内容包括:一种组合式启动机-发电机装置包括:电动机器;齿轮组,其构造成沿第一动力流动方向和第二动力流动方向联接电动机器和发动机。该齿轮组构造成沿第一动力流动方向至少以第一传动比,第二传动比和第三传动比中的一个操作,以及沿第二动力流动方向至少以第四传动比操作。启动机-发电机装置包括:离合器装置,其具有至少一个离合器,所述至少一个离合器选择性地联接到齿轮组,以沿第一动力流动方向实现第一传动比、第二传动比和第三传动比,并沿第二动力流动方向实现第四传动比;和凸轮板,其被构造成将所述至少一个离合器从其中所述至少一个离合器与齿轮组分离的分离位置转换到其中所述至少一个离合器联接至齿轮组的接合位置。(A combination starter-generator device comprising: an electric machine; a gear set configured to couple the electric machine and the engine in a first power flow direction and a second power flow direction. The gear set is configured to operate in at least one of a first gear ratio, a second gear ratio, and a third gear ratio in a first power flow direction, and at least a fourth gear ratio in a second power flow direction. The starter-generator device includes: a clutch arrangement having at least one clutch selectively coupled to the gear set to achieve a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and a fourth gear ratio in the second power flow direction; and a cam plate configured to shift the at least one clutch from a disengaged position in which the at least one clutch is disengaged from the gear set to an engaged position in which the at least one clutch is coupled to the gear set.)
1. A combined starter-generator arrangement for a work vehicle having an engine, the starter-generator arrangement comprising:
an electric machine;
a gear set configured to receive rotational input from the electric machine and the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction, the gear set configured to operate in at least one of a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and at least a fourth gear ratio in the second power flow direction;
a clutch arrangement having at least one clutch selectively coupled to the gear set to achieve a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and a fourth gear ratio in the second power flow direction; and
a cam plate configured to transition the at least one clutch from a disengaged position in which the at least one clutch is disengaged from the gear set to an engaged position in which the at least one clutch is coupled to the gear set.
2. The combined starter-generator apparatus of claim 1 wherein the cam plate is generally disc-shaped having a first face and a second face, the cam plate including a plurality of cam teeth extending from the first face to engage the at least one clutch and transition the at least one clutch from the disengaged position to the engaged position.
3. The combination starter-generator arrangement of claim 2, wherein the at least one clutch includes a first clutch and a second clutch, each of the first and second clutches being selectively repositionable between an engaged position and a disengaged position, and
wherein the plurality of cam teeth comprise: at least one first cam tooth positioned on the cam plate to selectively engage the first clutch into an engaged position; and at least one second cam tooth positioned on the cam plate to selectively engage the second clutch into an engaged position.
4. The combined starter-generator apparatus of claim 3 wherein the cam plate is configured to pivot through a range of angular positions, wherein at a first angular position the at least one first cam tooth engages the first clutch and the second clutch remains disengaged with respect to the at least one second cam tooth, and at a second angular position the at least one second cam tooth engages the second clutch and the first clutch remains disengaged with respect to the at least one first cam tooth.
5. The combined starter-generator apparatus according to claim 4, wherein the at least one first cam-tooth is radially and circumferentially offset relative to the at least one second cam-tooth.
6. The combined starter-generator device according to claim 5,
wherein the at least one clutch further comprises a third clutch selectively repositionable between an engaged position and a disengaged position, an
Wherein the plurality of cam teeth further includes at least one third cam tooth positioned on the cam plate to selectively engage the third clutch into an engaged position.
7. The combined starter-generator device according to claim 6,
wherein the at least one third cam tooth is radially and circumferentially offset relative to the at least one first cam tooth and the at least one second cam tooth, an
Wherein the cam plate at the third angular position is configured to: such that the at least one third cam tooth engages the third clutch and the first clutch and the second clutch remain disengaged with respect to the at least one first cam tooth and the at least one second cam tooth.
8. The combination starter-generator device of claim 7, further comprising an actuator assembly coupled to the cam plate and configured to pivot the cam plate between a first angular position, a second angular position, and a third angular position.
9. The combined starter-generator arrangement of claim 7, wherein the clutch arrangement is a dog clutch arrangement and the first clutch, the second clutch and the third clutch are concentrically arranged in the disengaged position such that the second clutch is positioned in the first clutch and the third clutch is positioned in the second clutch.
10. The combined starter-generator arrangement of claim 9, wherein the first clutch includes a first ring base and at least one first clutch tooth extending from the first ring base, the second clutch includes a second ring base and at least one second clutch tooth extending from the second ring base, and the third clutch includes a third ring base and at least one third clutch tooth extending from the third ring base; and
wherein the at least one first clutch tooth, the at least one second clutch tooth, and the at least one third clutch tooth are engaged with the gear set in respective engaged positions of the first clutch, the second clutch, and the third clutch.
11. The combined starter-generator device according to claim 10,
wherein the dog clutch arrangement further comprises a stationary plate axially located between the gear set and the first, second and third clutches when the first, second and third clutches are in the disengaged position,
wherein the statically determinate plate defines at least one first slot, at least one second slot and at least one third slot, an
Wherein the at least one first slot receives the at least one first clutch tooth when the first clutch is in the engaged position, the at least one second slot receives the at least one second clutch tooth when the second clutch is in the engaged position, and wherein the at least one third slot receives the at least one third clutch tooth when the third clutch is in the engaged position.
12. The combined starter-generator device according to claim 11,
wherein the first clutch comprises at least one first opening, the second clutch comprises at least one second opening, the third clutch comprises at least one third opening, and
wherein the at least one first opening, the at least one second opening, and the at least one third opening are configured to receive the cam actuator when the first clutch, the second clutch, and the third clutch are each in the disengaged position.
13. The combined starter-generator device according to claim 12,
wherein the gear set comprises a compound planetary gear train comprising an input shaft, first and second stage sun gears, first and second stage planet carriers and a ring gear, wherein the first stage planet carrier is connected to the second stage sun gear by means of splines, wherein the number of teeth of the first stage planet gears is different from the number of teeth of the second stage planet gears;
wherein, in the engine cold start mode, the first clutch is in an engaged position to fix the second-stage planetary carrier, the second clutch and the third clutch are in a disengaged position, and the rotational power from the electric machine is moved in a first power flow direction from the input shaft to the first-stage sun gear, the first-stage planetary carrier, the second-stage sun gear, the second-stage planetary gear, and the ring gear to be output to the engine at a first gear ratio; and
wherein in the engine warm start mode, the second clutch is in an engaged position to fix the second stage sun gear, the first clutch and the third clutch are in a disengaged position, and the rotational power from the electric machine is moved in the first power flow direction from the input shaft to the first stage sun gear, the first stage planetary gears and the ring gear to be output to the engine at the second gear ratio.
14. The combined starter-generator device according to claim 13,
wherein, in the supercharging mode, the third clutch is in the engaged position to couple the second stage sun gear to the first stage sun gear, and the first clutch and the second clutch are in the disengaged position, and the rotational power from the electric machine moves in the first power flow direction from the input shaft to the first stage sun gear and the second stage sun gear, the first stage planetary gear and the second stage planetary gear, and the ring gear to be output to the engine at a third gear ratio; and
wherein in the power generation mode, the third clutch is in an engaged position to couple the second stage sun gear to the first stage sun gear, and the first clutch and the second clutch are in a disengaged position, and further, the rotational power from the engine is moved in the second power flow direction from the ring gear to the first stage planetary gear and the second stage planetary gear, the first stage sun gear and the second stage sun gear, and the input shaft to be output to the electric machine at the fourth gear ratio.
15. The combined starter-generator arrangement of claim 1 wherein the third gear ratio and the fourth gear ratio are each 1: 1 in the gear set; and
wherein the first gear ratio is greater than the second gear ratio, and the second gear ratio is greater than the third gear ratio.
16. A driveline assembly for a work vehicle, comprising:
an engine;
an electric machine;
a gear set configured to receive rotational input from the electric machine and the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction, the gear set configured to operate in at least one of a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and at least a third gear ratio in the second power flow direction; and
a clutch arrangement having at least one clutch selectively coupled to the gear set to achieve a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and a fourth gear ratio in the second power flow direction; and
a cam plate configured to transition the at least one clutch from a disengaged position in which the at least one clutch is disengaged from the gear set to an engaged position in which the at least one clutch is coupled to the gear set.
17. The driveline assembly of claim 16, wherein the at least one clutch includes at least a first clutch, a second clutch, and a third clutch, the first clutch, second clutch, and third clutch being selectively coupled to a gear set and each being selectively repositionable between an engaged position and a disengaged position;
wherein the first clutch in the engaged position is configured to achieve a first gear ratio in a first power flow direction as an engine cold start mode; the second clutch in the engaged position is configured to achieve a second gear ratio in the first power flow direction as an engine warm start mode; and the third clutch in the engaged position is configured to achieve a third gear ratio in the first power flow direction, as a boost mode, and to achieve the third gear ratio in the second power flow direction, as a generate mode,
wherein the cam plate is generally disc-shaped having a first face and a second face, the cam plate including at least one first cam tooth, at least one second cam tooth radially and circumferentially offset with respect to the at least one first cam tooth, and at least one third cam tooth radially and circumferentially offset with respect to the at least one first cam tooth and the at least one second cam tooth; and
wherein the cam plate is pivotable to a first angular position in which the at least one first cam tooth places the first clutch in the engaged position and the second and third clutches remain disengaged with respect to the at least one second cam tooth and the at least one third cam tooth,
the cam plate is pivotable to a second angular position in which the at least one second cam tooth places the second clutch in the engaged position and the first and third clutches remain disengaged with respect to the at least one first and third cam teeth, an
The cam plate is pivotable to a third angular position in which the at least one third cam tooth places the third clutch in the engaged position and the first and second clutches remain disengaged with respect to the at least one first cam tooth and the at least one second cam tooth.
18. The drive train assembly of claim 17,
wherein the third clutch is concentrically disposed within the second clutch when the second clutch and the third clutch are in the disengaged position; and the second clutch is concentrically disposed within the first clutch when the first clutch and the second clutch are in the disengaged position.
19. The drive train assembly of claim 18,
wherein the gear set comprises a compound planetary gear train comprising an input shaft, first and second stage sun gears, first and second stage planet carriers and a ring gear, wherein the first stage planet carrier is connected to the second stage sun gear by means of splines, wherein the number of teeth of the first stage planet gears is different from the number of teeth of the second stage planet gears;
wherein, in the engine cold start mode, the first clutch is in an engaged position to fix the second-stage planetary carrier, the second clutch and the third clutch are in a disengaged position, and the rotational power from the electric machine is moved in a first power flow direction from the input shaft to the first-stage sun gear, the first-stage planetary carrier, the second-stage sun gear, the second-stage planetary gear, and the ring gear to be output to the engine at a first gear ratio; and
wherein in the engine warm start mode, the second clutch is in an engaged position to fix the second stage sun gear, the first clutch and the third clutch are in a disengaged position, and the rotational power from the electric machine is moved in the first power flow direction from the input shaft to the first stage sun gear, the first stage planetary gears and the ring gear to be output to the engine at the second gear ratio.
20. The drive train assembly of claim 19,
wherein, in the supercharging mode, the third clutch is in the engaged position to couple the second stage sun gear to the first stage sun gear, and the first clutch and the second clutch are in the disengaged position, and the rotational power from the electric machine moves in the first power flow direction from the input shaft to the first stage sun gear and the second stage sun gear, the first stage planetary gear and the second stage planetary gear, and the ring gear to be output to the engine at a third gear ratio; and
wherein in the power generation mode, the third clutch is in an engaged position to couple the second stage sun gear to the first stage sun gear, and the first clutch and the second clutch are in a disengaged position, and further, the rotational power from the engine is moved in the second power flow direction from the ring gear to the first stage planetary gear and the second stage planetary gear, the first stage sun gear and the second stage sun gear, and the input shaft to be output to the electric machine at the third gear ratio.
Technical Field
The present disclosure relates to a work vehicle power system including an arrangement for starting a mechanical power plant and producing electrical power therefrom.
Background
Work vehicles, such as those used in the agricultural, construction, and forestry industries, as well as other conventional vehicles, may be powered by an internal combustion engine (e.g., a diesel engine), although this situation is becoming more common with hybrid power sources employed (e.g., engines and electric motors). In any event, the engine remains the primary power source for the work vehicle and requires mechanical input from the starter to initiate rotation of the crankshaft and reciprocation of the pistons within the cylinders. The torque requirements to start an engine are high, especially for large diesel engines that are common in heavy machinery.
The work vehicle also includes subsystems that require electrical power. To power these subsystems of the work vehicle, an alternator or generator may be used to utilize a portion of the engine power to generate ac or dc power. Then, the current from the alternator is inverted to charge the battery of the work vehicle. Typically, a direct or serpentine belt couples the output shaft of the engine to an alternator to produce alternating current. The torque demand for current generation by the running engine is significantly lower than the torque demand at engine start-up. In order to properly transfer power between the engine and the battery to start the engine and generate electricity, many different components and devices are typically required, causing problems in size, cost, and complexity.
Disclosure of Invention
The present disclosure provides a combined engine starter and generator arrangement with an integral transmission that may be used, for example, in a work vehicle for cold starting of the engine and generating electrical power, serving the dual purpose of an engine starter and an alternator, and in both cases, providing more robust power transfer to and from the engine.
In one aspect, the present disclosure provides a combination starter-generator arrangement for a work vehicle having an engine. The starter-generator device includes: an electric machine; a gear set configured to receive rotational input from the electric machine and the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction. The gear set is configured to operate in at least one of a first gear ratio, a second gear ratio, and a third gear ratio in a first power flow direction, and at least a fourth gear ratio in a second power flow direction. The starter-generator arrangement further includes a clutch arrangement having at least one clutch selectively coupled to the gear set to achieve a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and a fourth gear ratio in the second power flow direction; and a cam plate configured to shift the at least one clutch from a disengaged position in which the at least one clutch is disengaged from the gear set to an engaged position in which the at least one clutch is coupled to the gear set.
In another aspect, the present disclosure provides a driveline assembly for a work vehicle. The drive train assembly includes: an engine; an electric machine; a gear set configured to receive rotational input from the electric machine and the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction. The gear set is configured to operate in at least one of a first gear ratio, a second gear ratio, and a third gear ratio in a first power flow direction, and at least a third gear ratio in a second power flow direction. The driveline assembly further comprises: a clutch arrangement having at least one clutch selectively coupled to the gear set to achieve a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and a fourth gear ratio in the second power flow direction; and a cam plate configured to shift the at least one clutch from a disengaged position in which the at least one clutch is disengaged from the gear set to an engaged position in which the at least one clutch is coupled to the gear set.
The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features and advantages will become apparent from the description, the drawings, and the claims.
Drawings
FIG. 1 is a schematic side view of an example work vehicle in the form of an agricultural tractor in which the disclosed integrated starter-generator arrangement may be used;
FIG. 2 is a simplified partial perspective view of an engine of the work vehicle of FIG. 1 illustrating an example mounting location of an example starter-generator arrangement;
FIG. 3 is a schematic illustration of a portion of a power transmission arrangement of the work vehicle of FIG. 1 with an example starter-generator arrangement;
FIG. 4 is an end perspective view of a power transfer assembly of the example starter-generator arrangement that may be implemented in the work vehicle of FIG. 1;
FIG. 5 is a cross-sectional view of a power transmission assembly of an example starter-generator arrangement that may be implemented in the work vehicle of FIG. 1;
FIG. 6 is a more detailed view of a portion of the power transmission assembly of FIG. 5 for an exemplary starter-generator arrangement;
FIG. 7 is an isometric view of a cam plate for an example starter-generator arrangement that may be incorporated into the power transmission assembly of FIG. 5;
FIG. 8 is a perspective view of a clutch that may be incorporated into the power transmission assembly of FIG. 5 for the example starter-generator arrangement;
FIG. 9 is an isometric view of a stationary plate that may be incorporated into the power transmission assembly of FIG. 5 for an exemplary starter-generator arrangement;
FIG. 10 is a cross-sectional view of the power transfer assembly of FIG. 5, depicting a schematic illustration of a power flow path of the example starter-generator arrangement in a first engine start mode;
FIG. 11 is a cross-sectional view of the power transfer assembly of FIG. 5, depicting a schematic illustration of a power flow path of the example starter-generator arrangement in a second engine start mode;
FIG. 12 is a cross-sectional view of the power transfer assembly of FIG. 5, depicting a schematic illustration of a power flow path of the example starter-generator arrangement in a boost mode;
FIG. 13 is a cross-sectional view of the power transmission assembly of FIG. 5, depicting a schematic illustration of a power transmission path of the example starter-generator arrangement in a generating mode;
FIG. 14 is a partial cross-sectional view of the power transmission assembly of FIG. 5 in a first engine start mode of the example starter-generator arrangement; and
FIG. 15 is a more detailed partial view of a portion of the power transmission assembly of FIG. 5, depicting a drag clutch of the example starter-generator arrangement.
Like reference symbols in the various drawings indicate like elements.
Detailed Description
One or more example embodiments of the disclosed starter-generator are described below, as illustrated in the figures of the schematic diagrams briefly described above. Various modifications to the example embodiments may be contemplated by those skilled in the art.
As used herein, unless otherwise limited or modified, a list of elements (elements in the list being separated by a conjunction (e.g., "and") and further preceded by the phrase "one or more" or "at least one") denotes a configuration or arrangement that may include individual elements of the list or any combination of such elements. For example, "at least one of A, B and C" or "one or more of A, B and C" means the possibility of any combination of two or more of A only, B only, C only or A, B and C (e.g., A and B; B and C; A and C; or A, B and C).
As used herein, the term "axial" refers to a dimension generally parallel to the axis of rotation, axis of symmetry, or centerline of one or more components. For example, in a cylinder or disc having a centerline and opposing generally circular ends or faces, the "axial" dimension may refer to a dimension that extends generally parallel to the centerline between the opposing ends or faces. In some instances, the term "axial" may be used with respect to components that are not cylindrical (or radially symmetric). For example, the "axial" dimension for a rectangular housing containing a rotating shaft may be considered to be a dimension generally parallel to the axis of rotation of the shaft. Further, the term "radially" as used herein may refer to: such as the dimensions or relationship of the components relative to a line extending outward from a shared centerline, axis, or similar reference point, in a plane of the cylinder or disk that is perpendicular to the centerline or axis. In some cases, one or both components may be considered "radially" aligned even though the components may not be cylindrical (or radially symmetric). Furthermore, the terms "axial" and "radial" (and any derivatives thereof) may encompass directional relationships other than precisely aligned (e.g., tilted) true axial and radial dimensions, so long as the relationship is primarily in the corresponding nominal axial or radial dimension. Additionally, the term "circumferential" may refer to the collective tangential dimension perpendicular to the radial and axial dimensions about the axis.
Many conventional vehicle power systems include an internal combustion engine and/or one or more batteries (or other chemical power sources) that power various components and subsystems of the vehicle. In some electric vehicles, a set of batteries power the entire vehicle, including the drive wheels, to move the vehicle. In hybrid gasoline and electric vehicles, the prime mover may alternate between engine power and electric motor power, or the engine power may be supplemented by electric motor power. In other conventional vehicles, the electrical system is used to initiate an engine start and run the non-driven electrical system of the vehicle. In the latter case, the vehicle typically has a starter motor that is driven by the vehicle battery to rotate the engine crankshaft to move the piston within the cylinder. In other cases, the power system may provide power assistance to the running engine.
Some engines (e.g., diesel engines) initiate combustion by compression of fuel, while other engines rely on a spark generator (e.g., a spark plug) powered by a battery. Once the engine is running at a sufficient speed, the power system can take engine power to power the electrical system and to charge the battery. Typically, such power harvesting is performed by an alternator or other type of generator. The alternator converts Alternating Current (AC) to Direct Current (DC) usable by the battery and vehicle electrical components by flowing the AC through an inverter (e.g., a diode rectifier). Conventional alternators utilize power from an engine by coupling the rotor of the alternator to the output shaft of the engine (or a component coupled thereto). Historically, this has been achieved by using a dedicated belt, but in some more modern vehicles the alternator is one of several devices connected to (and thus powered by) the engine by a single "serpentine" belt.
In certain applications, such as in certain heavy machinery and work vehicles, conventional arrangements having separate starter and generator components may be disadvantageous. Such separate components require separate housings, which may require separate sealing or shielding from the operating environment and/or occupy separate locations within the limited space of the engine compartment. Other engine compartment layout complexities may also arise.
One or more example embodiments of an improved vehicle powertrain system are described below that address one or more of these (or other) problems of conventional systems. In one aspect, the disclosed system includes a combination or integrated device that performs an engine cranking function of a starter motor and a power generation function of a generator. This device is referred to herein as an integrated starter-generator device ("ISG" or "starter-generator"). This term is used herein, at least in certain embodiments of the system, regardless of the type of power (i.e., AC or DC current) generated by the device. In some embodiments, the starter-generator device may be produced in the store in a manner that one skilled in the art may consider a "generator" device that directly produces direct current. However, as used herein, the term "generator" shall mean generating static or alternating polarity electrical power (i.e., AC or DC). Thus, in the particular case of a starter-generator device, the power generation function is similar to a conventional alternator and it generates alternating current power which is then rectified to DC power, either internally or externally of the starter-generator device.
In certain embodiments, the starter-generator arrangement may include a direct mechanical power coupling to the engine, thereby avoiding the use of a belt between the engine and the starter-generator arrangement. For example, a starter-generator arrangement may include a power transfer assembly within its housing having a gear set that is directly coupled to an output shaft of the engine. The gear sets may take any of a variety of forms, including arrangements with meshing spur or other gears and arrangements with one or more planetary gear sets. The power transfer assembly may achieve a large gear reduction ratio so that a single electric machine (i.e., motor or generator) may be used and operated at a suitable speed for one or more types of engine starting and electrical power generation. A direct power coupling between the starter-generator device and the engine may improve system reliability, cold start performance, and system power generation.
Further, in some embodiments, the starter-generator device may have a power transfer assembly that automatically and/or selectively changes gear ratios (i.e., transitions between power flow paths having different gear ratios). For example, the power transfer assembly may include one or more engagement members that engage or disengage automatically or on command. For example, a passive engagement element, such as a one-way clutch (e.g., a roller clutch or a sprag clutch), may be used to effect power transmission through the power flow path in the engine starting direction; active engagement components, such as friction clutch assemblies, may be used to effect power transfer through other power flow paths. In this manner, a bi-directional or other clutch (or other) configuration may be employed to perform the cranking and power generation functions with appropriate control hardware. Due to the bi-directional nature of the power transfer assembly, the power transfer belt assembly may be implemented with only a single belt tensioner, thereby providing a relatively compact and simple assembly. In addition to providing torque in two different directions of power flow, the gear sets may be constructed and arranged to provide power transfer from the electric machine to the engine at one of two different speeds, for example, according to different gear ratios. The selection of speed may provide additional functionality and flexibility to the power transfer assembly.
In one example, the combined starter-generator may further include a dog clutch arrangement (dog clutch) having first, second, and third clutches arranged annularly and concentrically, each clutch having clutch teeth that selectively engage the gear set when the respective clutch is repositioned from a disengaged position to an engaged position. The clutch may be supported between the clutch and the gear set by a statically determinate plate to receive reaction forces to provide a degree of flexibility to the clutch.
The combined starter-generator also includes a cam plate having cam teeth that is pivotable to urge the clutch into an engaged position based on an angular position. The cam teeth engaging the respective clutch may be radially and circumferentially offset relative to each other. In some examples, the clutch may include an opening to receive the cam teeth in the disengaged position.
In some examples, the combined starter-generator clutch may further include a drag clutch (dragclutch) that may be at least partially mounted on the input shaft to slow the electric machine. The drag clutch may be spring preloaded to generate a predetermined amount of drag force, for example, about 10 Nm. The effect of the drag force is to promote synchronization during speed or direction changes.
Each of which will be discussed in more detail below.
Referring to the drawings, an example work vehicle powertrain will be described in detail as a component of a powertrain. It will be apparent from the discussion herein that the disclosed system may be advantageously used in a variety of settings and with a variety of machines. For example, referring now to fig. 1, a powertrain (or drive train assembly) 110 may be included in work vehicle 100, with work vehicle 100 depicted as an agricultural tractor. However, it will be understood that other configurations are possible, including configurations having work vehicle 100 as a different kind of tractor, or as a work vehicle (e.g., harvester, feller, grader, etc.) for use in other aspects of the agricultural industry or for use in the construction and forestry industries. It will also be appreciated that aspects of the powertrain 110 may also be used in non-work vehicle and non-vehicle applications (e.g., fixed location installations).
Briefly, work vehicle 100 has a main frame or chassis 102 supported by ground engaging wheels 104, at least the front wheels of which 104 are steerable. The chassis 102 supports a power system (or device) 110 and a cab 108, and operator interfaces and controls (e.g., various joysticks, switches, buttons, touch screens, keypads, speakers and microphones associated with voice recognition systems) are provided in the cab 108.
As schematically shown, the power system 110 includes an engine 120, an integrated starter-
The starter-
As discussed above, the controller 150 may be considered part of the powertrain 110 to control various aspects of the work vehicle 100, particularly the characteristics of the powertrain 110. Controller 150 may be a work vehicle Electronic Controller Unit (ECU) or a dedicated controller. In some embodiments, controller 150 may be configured to receive input commands from various sensors, units, and systems onboard work vehicle 100 or remote from work vehicle 100 via a human-machine interface or operator interface (not shown) and interact with an operator; in response, controller 150 generates one or more types of commands to be implemented by various systems of power system 110 and/or work vehicle 100.
In general, the controller 150 may be configured as a computing device with associated processor device and memory architecture, and may be configured as a hydraulic, electric or electro-hydraulic controller, or the like. As such, controller 150 may be configured to perform various computing and control functions with respect to power system 110 (and other machines). Controller 150 may be in electronic, hydraulic, or other communication with various other systems or devices of work vehicle 100. For example, controller 150 may be in electronic or hydraulic communication with various actuators, sensors, and other devices internal to work vehicle 100 (or external to work vehicle 100), including various devices associated with power system 110. Generally, the controller 150 generates command signals based on operator inputs, operating conditions, and routines and/or schedules stored in memory. For example, an operator may provide input to the controller 150 via an operator input device that indicates an appropriate mode, or at least partially defines an operating condition under which the controller 150 selects the appropriate mode. In some examples, the controller 150 may additionally or alternatively operate autonomously without manual input. The controller 150 may communicate with other systems or devices, including other controllers, in various known manners, including via a CAN bus (not shown), via wireless or hydraulic communication devices, or otherwise.
Additionally, power system 110 and/or work vehicle 100 may include a hydraulic system 152 having one or more electro-hydraulic control valves (e.g., solenoid valves) that facilitate hydraulic control of various vehicle systems, particularly various aspects of starter-
In one example, the starter-
Referring briefly to FIG. 2, FIG. 2 illustrates a simplified, partial isometric view of an example mounting location of starter-
Referring additionally to fig. 3, fig. 3 is a simplified schematic illustration of a power
The
The power
As a result of the bi-directional configuration, the power
In one example, fig. 4 depicts an engine-side isometric view of a
The
At the first side 306, the
The
Additionally referring to fig. 6, a close-up view of a portion of fig. 5 is shown. The planetary gear set 320 includes a first
The first stage planet gears 324 are supported by a first
The gear set 320 further includes a
In practice, the
The gear set 320 further includes a second
As will now be described in greater detail, the
Generally, the clutch apparatus 360 includes a cam actuator or
In one example, the
As schematically shown, the gear set 320 includes a plurality of
The second engagement element 432 may be in the form of one or more slots or locks on the second
The third engaging element 434 is configured to selectively couple and decouple the first
Reference is briefly made to fig. 7, which is an isometric view of
Briefly, referring again to fig. 6, the
Referring now to fig. 8, fig. 8 is an isometric view of the
Each clutch 390, 400, 410 further defines a series of clutch teeth 396, 406, 416 extending substantially perpendicularly from the respective first clutch face 391, 401, 411 of the ring base 395, 405, 415 and the clutch opening 397 of the ring base 395, 405, 415, each clutch tooth being circumferentially adjacent a respective one of the clutch teeth 396, 406, 416. In this embodiment, four clutch teeth 396, 406, 416 and four clutch openings 397, 407, 417 are provided for each clutch 390, 400, 410. Other embodiments may have a greater or lesser number of teeth and/or openings. The clutch teeth 396, 406, 416 may have a slightly beveled or sloped shape at the intersection of the respective teeth 396, 406, 416 and the bases 395, 405, 415, which facilitates engagement and disengagement of the
In one embodiment, each of the
In this example, the clutch teeth 396 and clutch openings 397 of the
As described above, the
Referring now to fig. 9, fig. 9 is an isometric view of
As introduced above, the
Referring now to FIG. 10, a diagram of the
In this example, an
The positioning of clutch teeth 396 through
When second
In one example, the
Referring now to FIG. 11, FIG. 11 is a partial cross-sectional view of the
In this example, an
The positioning of the clutch teeth 406 of the
In the engine warm start mode, the engine 120 may be initially inactive or active. In any event, the controller 150 energizes the
Since the first
Since the number of the first stage
In one example, the
Referring to FIG. 12, a partial cross-sectional view of the
In this example, an
Since the second
In one example, the
Referring to FIG. 13, a cross-sectional view of the
In this example, the function of the
Because the second
In the generating mode, the engine 120 rotates the crankshaft 122 and the
Since the first
In one example, the
As will now be described, the
Because the
The frictional engagement between the
Thus, various embodiments of a vehicle electrical system including an integrated starter-generator arrangement have been described. Various transfer components may be included in the device, thereby reducing the space occupied by the system. The power transfer assembly may provide multiple speeds or gear ratios, as well as transitions between multiple speeds/multiple gear ratios. One or more clutch devices may be used to selectively apply torque to the gear sets of the power transfer assembly in both power flow directions. Direct mechanical engagement with the engine shaft reduces complexity and increases system reliability. The use of planetary gear sets in the power transfer assembly provides high gear reduction and torque capacity in a compact spatial range and reduces backlash. Due to the bi-directional nature of the power transfer assembly, the power transfer belt assembly may be implemented with only a single belt tensioner, thereby providing a relatively compact and simple assembly. In addition, by using a power transmission belt arrangement (where the belt and pulley are coupled together and transmit power between the electric machine and the power transmission assembly, rather than directly connecting and coupling the electric machine to the power transmission assembly), the electric machine may be mounted spaced apart from the power transmission assembly so that the engine may be better mounted in the vehicle engine compartment. In addition, additional gear ratios (e.g., 4: 1 ratios) may be achieved by connecting the electric machine to the power transmission assembly using belts and pulleys. The embodiments discussed above include a dual planetary gear set, sun input, ring output configuration to provide an engine warm start mode and an engine cold start mode, and a ring input, sun output configuration to provide a power generation mode. In this way, a quad mode assembly may be provided.
As described above, the dog clutch provides a degree of flexibility to the clutch to vary the power flow path in a relatively compact and robust assembly. The cam means cooperate with the dog clutch means to reposition the clutch from the disengaged position to the engaged position based on the angular position in a reliable and relatively simple manner. In some examples, the combined starter-generator clutch may further include a drag clutch that functions to facilitate synchronization during speed or direction changes.
Further, the following examples are provided, numbered for ease of reference.
1. A combined starter-generator arrangement for a work vehicle having an engine, the starter-generator arrangement comprising: an electric machine; a gear set configured to receive rotational input from the electric machine and the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction, the gear set configured to operate in at least one of a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and at least a fourth gear ratio in the second power flow direction; a clutch arrangement having at least one clutch selectively coupled to the gear set to achieve a first gear ratio, a second gear ratio, and a third gear ratio in the first power flow direction and a fourth gear ratio in the second power flow direction; and a cam plate configured to shift the at least one clutch from a disengaged position in which the at least one clutch is disengaged from the gear set to an engaged position in which the at least one clutch is coupled to the gear set.
2. The combination starter-generator apparatus of example 1, wherein the cam plate is generally disc-shaped having a first face and a second face, the cam plate including a plurality of cam teeth extending from the first face to engage the at least one clutch and transition the at least one clutch from the disengaged position to the engaged position.
3. The combination starter-generator apparatus of example 2, wherein the at least one clutch includes a first clutch and a second clutch, each of the first and second clutches being selectively repositionable between an engaged position and a disengaged position, and
wherein the plurality of cam teeth comprise: at least one first cam tooth positioned on the cam plate to selectively engage the first clutch into an engaged position; and at least one second cam tooth positioned on the cam plate to selectively engage the second clutch into an engaged position.
4. The combination starter-generator apparatus of example 3, wherein the cam plate is configured to pivot within a range of angular positions, wherein at a first angular position the at least one first cam tooth engages the first clutch and the second clutch remains disengaged with respect to the at least one second cam tooth, and at a second angular position the at least one second cam tooth engages the second clutch and the first clutch remains disengaged with respect to the at least one first cam tooth.
5. The combination starter-generator apparatus of example 4, wherein the at least one first cam-tooth is radially and circumferentially offset relative to the at least one second cam-tooth.
6. The combined starter-generator apparatus according to example 5, wherein,
wherein the at least one clutch further comprises a third clutch selectively repositionable between an engaged position and a disengaged position, an
Wherein the plurality of cam teeth further includes at least one third cam tooth positioned on the cam plate to selectively engage the third clutch into an engaged position.
7. According to the combined starter-generator device of example 6,
wherein the at least one third cam tooth is radially and circumferentially offset relative to the at least one first cam tooth and the at least one second cam tooth, an
Wherein the cam plate at the third angular position is configured to: such that the at least one third cam tooth engages the third clutch and the first clutch and the second clutch remain disengaged with respect to the at least one first cam tooth and the at least one second cam tooth.
8. The combination starter-generator apparatus of example 7, further comprising an actuator assembly coupled to the cam plate and configured to pivot the cam plate between a first angular position, a second angular position, and a third angular position.
9. The combined starter-generator apparatus according to example 7, wherein the clutch device is a dog clutch device, and the first clutch, the second clutch, and the third clutch are concentrically arranged in the disengaged position such that the second clutch is positioned in the first clutch and the third clutch is positioned in the second clutch.
10. The combined starter-generator apparatus of example 9, wherein the first clutch includes a first ring base and at least one first clutch tooth extending from the first ring base, and the second clutch includes a second ring base and at least one second clutch tooth extending from the second ring base, and the third clutch includes a third ring base and at least one third clutch tooth extending from the third ring base; and wherein the at least one first clutch tooth, the at least one second clutch tooth, and the at least one third clutch tooth are engaged with the gear set in respective engaged positions of the first clutch, the second clutch, and the third clutch.
11. The combined starter-generator apparatus of example 10, wherein the dog clutch apparatus further includes a stationary plate axially between the gear set and the first, second, and third clutches when the first, second, and third clutches are in the disengaged position, wherein the stationary plate defines at least one first slot, at least one second slot, and at least one third slot, and wherein the at least one first slot receives the at least one first clutch tooth when the first clutch is in the engaged position and the at least one second slot receives the at least one second clutch tooth when the second clutch is in the engaged position, wherein the at least one third slot receives the at least one third clutch tooth when the third clutch is in the engaged position.
12. The combination starter-generator apparatus of example 11, wherein the first clutch includes at least one first opening, the second clutch includes at least one second opening, and the third clutch includes at least one third opening, and wherein the at least one first opening, the at least one second opening, and the at least one third opening are configured to receive the cam actuator when the first clutch, the second clutch, and the third clutch are each in the disengaged position.
13. The combination starter-generator apparatus of example 12, wherein the gear set includes a compound planetary gear train including an input shaft, first and second stage sun gears, first and second stage planet carriers, and a ring gear, wherein the first stage planet carrier is connected to the second stage sun gear by a spline, wherein the number of teeth of the first stage planet gears is different from the number of teeth of the second stage planet gears; wherein, in the engine cold start mode, the first clutch is in an engaged position to fix the second-stage planetary carrier, the second clutch and the third clutch are in a disengaged position, and the rotational power from the electric machine is moved in a first power flow direction from the input shaft to the first-stage sun gear, the first-stage planetary carrier, the second-stage sun gear, the second-stage planetary gear, and the ring gear to be output to the engine at a first gear ratio; and wherein, in the engine warm start mode, the second clutch is in an engaged position to fix the second stage sun gear, the first clutch and the third clutch are in a disengaged position, and the rotational power from the electric machine is moved in the first power flow direction from the input shaft to the first stage sun gear, the first stage planetary gears and the ring gear to be output to the engine at the second gear ratio.
14. The combined starter-generator apparatus according to example 13, wherein in the supercharging mode, the third clutch is in the engaged position to couple the second-stage sun gear to the first-stage sun gear, and the first clutch and the second clutch are in the disengaged position, and the rotational power from the electric machine is moved in the first power flow direction from the input shaft to the first-stage sun gear and the second-stage sun gear, the first-stage planetary gear and the second-stage planetary gear, and the ring gear to be output to the engine at the third gear ratio; and wherein, in the power generation mode, the third clutch is in the engaged position to couple the second stage sun gear to the first stage sun gear, and the first clutch and the second clutch are in the disengaged position, and further, the rotational power from the engine is moved in the second power flow direction from the ring gear to the first stage planetary gear and the second stage planetary gear, the first stage sun gear and the second stage sun gear, and the input shaft to be output to the electric machine at the fourth gear ratio.
15. The combined starter-generator apparatus of example 1, wherein the third gear ratio and the fourth gear ratio are each 1: 1 in the gear set; and wherein the first gear ratio is greater than the second gear ratio, and the second gear ratio is greater than the third gear ratio.
As will be appreciated by one skilled in the art, certain aspects of the subject matter of the present disclosure may be described as a method, a system (e.g., a work vehicle control system included in a work vehicle), or a computer program product. Accordingly, particular embodiments may be embodied entirely in hardware, in software (including firmware, resident software, micro-code, etc.) or in a combination of software and hardware aspects. Furthermore, particular embodiments may take the form of a computer program product on a computer-usable storage medium having computer-usable program code embodied in the medium.
Any suitable computer usable or computer readable medium may be utilized. The computer usable medium may be a computer readable signal medium or a computer readable storage medium. A computer-usable or computer-readable storage medium (including storage devices associated with computing devices or client electronic devices) may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical line, a portable compact disc read-only memory (CD-ROM), an optical storage device. In the context of this document, a computer-usable or computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be a non-volatile type and may be any computer readable medium that is not a computer readable storage medium and that is capable of communicating, propagating or transporting a program for use by or in connection with an instruction execution system, apparatus, or device.
Aspects of certain embodiments are described herein with reference to flowchart and/or method block diagrams, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the operation of possible embodiments of algorithms, functions, systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). Further, in some alternative embodiments, the functions noted in the blocks (or the functions otherwise described herein) may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks (or operations) may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should furthermore be understood that: the terms "comprises" and/or "comprising" when used in this specification is taken to specify the presence of stated features, integers, steps, operations, elements, and/or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The description of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the disclosure. The embodiments specifically referenced herein were chosen and described in order to best explain the principles of the disclosure and their practical applications, and to enable others of ordinary skill in the art to understand the disclosure and to recognize various alternative embodiments, modifications, and variations of the described examples. Accordingly, various embodiments and implementations other than those explicitly described are within the scope of the following claims.
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