Power machine and air inlet system thereof

Abstract

The present disclosure provides an air intake system (300) for a power machine (200) that may use a hollow section of a frame (310) of the power machine to form a portion of an air intake path. The air intake system may include: an air inlet (302) coupled to an exterior panel (330) of the power machine; a filter assembly (304) comprising a filter enclosure (310) and a filter element; a first air duct (306) coupled between the inlet and a closed compartment (312) of a frame (210) of the power machine; and a second air duct (308) coupled between the closed compartment and the filter enclosure; to reach the filter enclosure (310), air entering the filter enclosure may travel along an air intake path including an air inlet (302), a first air duct (306), a closed compartment (312), and a second air duct (308).

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 402,654, filed on August 31, 2022, and which is incorporated by reference. Background Art

[0003] The present disclosure relates to power machines. More specifically, the present invention relates to air intake systems for internal combustion engines of power machines. For purposes of this disclosure, power machines include any type of machine that generates power for accomplishing a specific task or tasks. One type of power machine is a work vehicle. A work vehicle is typically a self-propelled vehicle having a work device such as a lift arm that can be manipulated to perform a work function (although some work vehicles may have other work devices). Work vehicles include loaders (including mini loaders), excavators, utility vehicles, lawn mowers, tractors (including compact tractors), and trenchers, to name just a few examples.

[0004] Power machines including internal combustion engines include an air intake system. The air intake system typically includes an air intake duct that directs the air flow to a filter element. The air filter element then filters the air entering the engine, whether through the compressor inlet on a turbocharger, the throttle body inlet, or the intake manifold / plenum.

[0005] The above discussion is provided for general background information only and is not intended to be used to determine the scope of the claimed subject matter. Summary of the invention

[0006] The present disclosure provides an improved air intake system for a power machine, including forming a portion of an air intake path for a power source (e.g., an engine) of the power machine by using a hollow section of a frame of the power machine. In some examples, a generally horizontal or generally vertical portion of the air intake flow path can be provided, including an intake air inlet in front of the engine (e.g., and also behind a cab or other operator station). In some examples, appropriately configured enclosed compartments of frame members can facilitate extended horizontal and vertical portions of the flow path.

[0007] Some aspects of the present disclosure provide a power machine, the power machine including a frame, an engine, and an air intake system for the engine. The frame may include a hollow frame member forming a closed frame compartment, the closed frame compartment having a compartment inlet opening, a compartment outlet opening, and a closed flow path between the compartment inlet opening and the compartment outlet opening. The engine may be supported by the frame and enclosed in an engine compartment separate from the closed frame compartment. The air intake system may include: an air inlet, the air inlet may be coupled to an external panel of the power machine; a filter assembly, the filter assembly may include a filter enclosure and a filter element; a first air duct, the first air duct may define a first flow path between the air inlet and the compartment inlet opening; and a second air duct, the second air duct may define a second flow path between the compartment outlet opening and the filter enclosure. The air intake system may guide an intake air flow to the engine so that the intake air flow travels along an air intake path that may include the air inlet, the first flow path, the closed frame compartment, and the second flow path before entering the filter enclosure.

[0008] In some examples, the power machine may include a cooling outlet configured to exhaust air from an engine compartment. The air inlet may be arranged forward of the cooling outlet relative to a fore-and-aft axis of the power machine.

[0009] In some examples, the air inlet may be disposed rearward of an operator compartment of the power machine relative to a fore-aft axis of the power machine.

[0010] In some examples, the air inlet may be arranged forward of the engine relative to a fore-aft axis of the power machine.

[0011] In some examples, the air inlet, the first flow path, and the closed frame compartment may be arranged forward of the engine relative to a fore-aft axis.

[0012] In some examples, the air inlet may include a first inlet opening disposed on a first side of the air inlet facing a front end of the power machine.

[0013] In some examples, the air inlet may further include a second inlet opening on a second side of the air inlet facing the lateral side of the power machine.

[0014] In some examples, the first air duct may extend from an inside of the air inlet such that the second flow path extends in an outside direction from the air inlet to the cabin inlet opening.

[0015] In some examples, the closed frame bay may include a joint that supports a portion of the lift arm for pivotal movement relative to the frame.

[0016] In some examples, the tank access opening may be located at a top side of the closed frame tank.

[0017] In some examples, the tank exit opening may be located at a side of the closed frame tank that faces a rear end of the power machine.

[0018] In some examples, from a side elevation perspective, the first flow path and the closed flow path may define a substantially vertical path for air flow between the air inlet and a bottom end of the closed frame compartment.

[0019] In some examples, the second flow path may define a path for air flow between the cabin outlet opening and the filter assembly from a top plan view, and the path may be substantially parallel to a fore-aft axis of the power machine.

[0020] Some aspects of the present disclosure provide an air intake system for a power machine (or included in a power machine). The air intake system may include: an air inlet, a filter assembly, a first air duct, and a second air duct. The air inlet may be connected to an external panel of the power machine. The filter assembly may include a filter enclosure and a filter element. The first air duct may be connected between the air inlet and a closed frame compartment of a frame of the power machine. The second air duct may be connected between the closed frame compartment and the filter enclosure. The air intake system may guide the air flow to the filter assembly so that the air flow travels along an air intake path that may include the air inlet, the first air duct, the closed frame compartment, and the second air duct in sequence before entering the filter enclosure.

[0021] In some examples, the air inlet may include a first opening disposed on a first side of the air inlet facing a front end of the power machine.

[0022] In some examples, the air inlet may further include a second opening on a second side of the air inlet facing a lateral side of the power machine.

[0023] In some examples, the first air duct may be coupled to a top side of the closed frame compartment.

[0024] In some examples, the second air duct may be coupled to a side of the closed frame compartment facing the rear end of the power machine.

[0025] In some examples, the air intake path may define a first air flow path from a side elevation perspective, and the first air flow path may be substantially vertical between the air inlet and the enclosed frame bay.

[0026] In some examples, from a side elevation perspective, the air intake path can define a second air flow path that can be substantially horizontal between the enclosed frame compartment and a rearward portion that can be aligned along a vertical axis with the air inlet of the filter assembly.

[0027] Some aspects of the present disclosure may provide a method for providing air to an engine of a power machine. The air may be drawn into an air inlet disposed on the exterior of the power machine. The air may flow from the air inlet through a first air duct, the first air duct being coupled between the air inlet and a hollow frame member of a frame of the power machine. The air may flow from the first air duct through a closed frame compartment of a hollow frame member. The air may flow from the closed frame compartment through a second air duct coupled between the closed frame compartment and a filter assembly of the engine.

[0028] In some examples, air can flow from the air inlet to the hollow frame member along a substantially vertical flow path relative to a side elevation viewing angle.

[0029] In some examples, air may flow from the hollow frame member toward the engine along a substantially horizontal flow path relative to a side elevation perspective.

[0030] The Summary and Abstract are provided to introduce in a simplified form a selection of concepts that are further described below in the Detailed Description. The Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following drawings are provided to help illustrate various features of non-limiting examples of the present disclosure and are not intended to limit the scope of the present disclosure or to exclude alternative implementations.

[0032] Figure 1 is a functional system block diagram of a representative power machine upon which examples of the disclosed technology may be advantageously practiced.

[0033] Figures 2 to 3 A perspective view of a representative power machine in the form of a skid-steer loader of the type upon which examples of the disclosed technology may be practiced is shown.

[0034] Figure 4 The diagram shows that Figures 2 to 3 A block diagram of components of a power system for a loader such as the loader shown in FIG.

[0035] Figure 5A is a rear perspective view of a representative power machine in the form of a skid steer loader having an air intake system for an engine in accordance with one aspect of the present invention and is shown with various portions removed for clarity.

[0036] Figure 5B yes Figure 5A A side elevation view of a cross section of a power machine with the engine hidden and certain components rendered transparently for clarity.

[0037] Figure 5C yes Figure 5A A rear perspective view of a section of a power machine with various parts removed for clarity of presentation.

[0038] Figure 5D yes Figure 5A A top view of the power machinery.

[0039] Figure 5E Is caused by Figure 5D A top plan detail view of a portion of the power machine indicated by the dotted area VE-VE in FIG.

[0040] Figure 6 yes Figure 5A A side elevation view of a section of a power machine showing the engine.

[0041] Fig. 7A yes Figure 5A A rear elevation view of a power machine showing the operator's cab and certain other components.

[0042] Figure 7B yes Figure 5A A left perspective view of the power machine with Fig. 7A The same components are shown in FIG.

[0043] Figure 7C yes Figure 5A A right-side perspective view of the power machine with Fig. 7A The same components are shown in FIG. DETAILED DESCRIPTION

[0044] The concepts disclosed in this discussion are described and illustrated by reference to exemplary configurations and implementations. However, these concepts are not limited to the construction details and component arrangements in the illustrative examples in their application, and can be practiced or executed in various other ways. The terms in this document are used for descriptive purposes and should not be considered as limiting. Words such as "including", "comprising", "having" and their variations as used herein are intended to cover the items listed after these words, the equivalents of the listed items, and additional items.

[0045] When designing an air intake system for a power machine, there are various challenges to consider. These include providing clean air to the engine and providing cool air to the engine. For example, loaders or other power machines are often operated in dusty, dirty environments, and some internal compartments (such as the engine compartment) are not completely sealed from the external environment. In addition, other air flows for the power machine may introduce unwanted heat and dust into the area around the power machine, from which air can usually be sucked. For example, the cooling path of the power machine (e.g., the path of air sucked through a radiator and discharged to the outside of the power machine via a cooling fan) contains air that usually has dirt and dust entrained therein from the environment. The air in the cooling path is also usually hotter than the ambient air temperature because the temperature of the air increases when passing through the radiator, and is otherwise exposed to heat from the engine compartment.

[0046] Although heat exchangers and filter elements are commonly used to help address some of the challenges noted above, further improvements to conventional air intake systems are possible. For example, some arrangements disclosed herein can be used to provide improvements in the cleanliness and coolness of the air provided at the inlet of the air intake system and the efficiency of such air flow. By ensuring that cooler, cleaner air enters the air intake system, the service life of the filter element and the performance of the engine can be improved, and the overall efficiency of the power system of the power machine can also be improved.

[0047] For example, some configurations of the flow paths and associated components for the air intake system can advantageously arrange the inlet of the air intake system to be spaced apart from the engine compartment. Accordingly, some configurations disclosed herein can provide cooler and cleaner air to the engine of the power machinery than conventional systems. In some cases, the air intake system may include an inlet that is particularly arranged at a position that reduces the intake of dust and heat from the environment and from the cooling path of the engine (e.g., radiator, outlet vents, cooling fans, etc.). For example, the flow duct can be arranged so that the air inlet can be in front of the engine compartment to be appropriately spaced apart from the rearward outflow of the cooling air, or the air inlet can have an intake inlet (e.g., a screen port) that faces away from the engine compartment.

[0048] In some examples, the use of hollow frame members can also allow for an improved flow path for the air intake of the engine (or other power source), including by providing a properly positioned and enclosed duct for air flow between the engine compartment and a properly spaced intake location. For example, a flow path extending through the frame member can help provide a cooler and cleaner intake air flow than conventional designs, and also improve system efficiency in other ways (e.g., by reducing pressure drop in the intake flow path).

[0049] In some flow systems (and corresponding cooling methods) disclosed herein, flow paths including through hollow frame members can also contribute to the packaging and other spatial constraints of the internal area of ​​the loader (e.g., within the outer envelope defined by the main frame and the outer or supporting panels of the loader). Under conventional methods, these constraints may make it challenging to design an intake system that can provide optimal effective flow characteristics. For example, when trying to avoid designs with inherent inefficiencies relative to air flow (e.g., excessively convoluted flow paths), packaging constraints within the engine compartment may be particularly restrictive. In some cases, hollow frame members having closed flow paths can not only provide improved flow and space efficiency themselves, but can also allow other more efficient flow ducts to be used for other parts of the air intake path (e.g., ducts that provide extended sections of substantially horizontal or substantially vertical air flow between the air inlet and the engine).

[0050] These concepts can be implemented on a variety of power machines, as will be described below. Figure 1 A representative power machine on which the disclosed technology may be practiced is illustrated in diagram form in the FIG. 1 and before further examples are disclosed, the Figures 2 to 3 An example of such a power machine is illustrated in FIG and described below. For the sake of brevity, only one power machine is illustrated and discussed as a representative power machine. However, as mentioned above, the examples below may be used in a variety of applications including those described above. Figures 2 to 3 The representative power machine shown in the figure is practiced on any of a plurality of power machines of different types of power machines. For the purpose of this discussion, a power machine includes a frame, at least one working element, and a power source that can provide power to the working element to complete a work task. One type of power machine is a self-propelled working vehicle. A self-propelled working vehicle is a type of power machine that includes a frame, working elements, and a power source that can provide power to the working elements. At least one of the working elements is a starting system for moving the power machine under power.

[0051] Figure 1is a block diagram illustrating the basic systems of a power machine 100 , which may be any of a number of different types of power machines into which the examples discussed below may be advantageously incorporated. Figure 1 The block diagram of FIG. 1 identifies the various systems on the power machine 100 and the relationships between the various components and systems. As mentioned above, at the most basic level, for the purposes of this discussion, the power machine includes a frame, a power source, and a working element. The power machine 100 has a frame 110, a power source 120, and a working element 130. Figure 1 The power machine 100 shown in FIG. 1 is a self-propelled work vehicle, and therefore it also has a traction element 140, which itself is a working element provided for moving the power machine on a supporting surface, and an operator station 150, which provides an operating position for controlling the working element of the power machine. A control system 160 is provided to interact with other systems to perform various work tasks at least in part in response to control signals provided by an operator. For example, the control system 160 can be an integrated or distributed architecture of one or more processor devices and one or more memories, which are collectively configured to receive operator input or other input signals (e.g., sensor data) and output commands for power machine operation accordingly.

[0052] Certain work vehicles have work elements that can perform dedicated tasks. For example, some work vehicles have a lift arm to which an implement, such as a bucket, is attached, for example, by a pinned arrangement. The work element (i.e., the lift arm) can be manipulated to position the implement in order to perform the task. In some cases, the implement can be positioned relative to the work element, such as by rotating the bucket relative to the lift arm to further position the implement. Under normal operation of such a work vehicle, the bucket is intended to be attached and in use. Such a work vehicle may be able to receive other implements by disassembling the implement / work element combination and reassembling another implement in place of the original bucket. However, other work vehicles are intended to be used with a wide variety of implements and have, for example, Figure 1 The implement interface 170 shown is an implement interface. At its most basic, the implement interface 170 is a connection mechanism between the frame 110 or work element 130 and the implement, which can be as simple as a connection point for attaching the implement directly to the frame 110 or work element 130, or can be more complex, as discussed below.

[0053] On some power machines, the implement interface 170 may include an implement carrier, which is a physical structure that is movably attached to the working element. The implement carrier has engagement features and locking features to receive any of a plurality of different implements and secure it to the working element. One characteristic of such an implement carrier is that once the implement is attached to the implement carrier, the implement carrier is secured to the implement (i.e., cannot move relative to the implement), and when the implement carrier moves relative to the working element, the implement moves with the implement carrier. The term "implement carrier" as used herein is not just a pivot connection point, but a dedicated device dedicated to receiving and securing to a variety of different implements. The implement carrier itself may be mounted to a working element 130 such as a lift arm or frame 110. The implement interface 170 may also include one or more power sources for providing power to one or more working elements on the implement. Some power machines may have multiple working elements with implement interfaces, each of which may, but need not, have an implement carrier for receiving an implement. Some other power machines may have a working element with multiple implement interfaces so that a single working element can receive multiple implements simultaneously. Each of these implement interfaces may, but need not, have an implement carrier.

[0054] The frame 110 includes a solid structure that can support various other components attached to it or positioned thereon. The frame 110 can include any number of individual components. Some power machines have a rigid frame. That is, no part of the frame can move relative to another part of the frame. Other power machines have at least one part that can move relative to another part of the frame. For example, an excavator can have an upper frame portion that rotates relative to a lower frame portion. Other work vehicles have an articulated frame so that one part of the frame pivots relative to another part to achieve a steering function.

[0055] The frame 110 supports the power source 120, which is configured to provide power to one or more working elements 130 including one or more traction elements 140, and in some cases, the power source is configured to provide power used by the attached machine via the machine interface 170. The power from the power source 120 can be directly provided to any one of the working elements 130, the traction elements 140 and the machine interface 170. Alternatively, the power from the power source 120 can be provided to the control system 160, which in turn selectively provides power to the elements that can use the power to perform the working function. The power source for the power machine typically includes an engine (such as an internal combustion engine) and a power conversion system (such as a mechanical transmission or a hydraulic system) configured to convert the output from the engine into a power form that can be used by the working element. Other types of power sources can be incorporated into the power machine, including electrical power sources, or a combination of power sources commonly known as hybrid power sources.

[0056] Figure 1 A single working element designated as working element 130 is shown, but each power machine may have any number of working elements. Typically, the working element is attached to the frame of the power machine and can move relative to the frame when performing a working task. In some examples, as also discussed above, the working element may include a lifting arm assembly. In some examples, the working element may include a mower deck or other similar equipment. In addition, the traction element 140 is a special case of a working element because the working function of the traction element is generally to move the power machine 100 on a supporting surface. The traction element 140 is shown as being separated from the working element 130 because many power machines have additional working elements in addition to the traction element, although this is not always the case. The power machine may have any number of traction elements, some or all of which may receive power from the power source 120 to propel the power machine 100. The traction element may be, for example, a track assembly, a wheel attached to an axle, etc. The traction elements may be mounted to the frame such that movement of the traction elements is limited to rotation about an axis (such that steering is accomplished by a sliding action), or alternatively, the traction elements may be pivotally mounted to the frame such that steering is accomplished by pivoting the traction elements relative to the frame.

[0057] The power machine 100 includes an operator station 150, which includes an operating position from which an operator can control the operation of the power machine. In some power machines, the operator station 150 is defined by a closed cab or a partially closed cab. Some power machines on which the disclosed technology can be practiced may not have a cab or operator cabin of the type described above. For example, a walk-behind loader may not have a cab or operator cabin, but an operating position, which is used as an operator station from which the power machine is properly operated. More broadly, power machines other than work vehicles may have an operator station that is not necessarily similar to the operating position and operator cabin mentioned above. In addition, instead of an operator station adjacent to or located on the power machine, or in addition to an operator station adjacent to or located on the power machine, some power machines (such as the power machine 100) and the like (whether or not they have an operator cabin or operator position) may also be able to be remotely operated (i.e., operated from a remotely located operator station). This may include applications in which at least some of the operator control functions of the power machine may be operated from an operating position associated with an implement coupled to the power machine. Alternatively, in the case of some power machines, a remote control device may be provided (i.e., remote from both the power machine and any implement coupled thereto) capable of controlling at least some of the operator control functions on the power machine.

[0058] Figures 2 to 3 The figure shows a loader 200, which is Figure 1A specific example of a power machine of the type illustrated in Figure 2, wherein the examples discussed below may be advantageously employed. Loader 200 is a skid steer loader, which is a loader having traction elements (in this case four wheels) mounted to the frame of the loader via rigid axles. Here, the term "rigid axles" refers to the fact that the skid steer loader 200 does not have any traction elements that can be turned or steered to help the loader achieve a turn. Instead, the skid steer loader has a drive system that independently powers one or more traction elements on each side of the loader, such that by providing different traction signals to each side, the machine will tend to slip on the supporting surface. These varying signals may even include powering the traction elements on one side of the loader to move the loader in a forward direction, and powering the traction element(s) on the other side of the loader to operate the loader in the opposite direction, such that the loader will turn around a radius centered within the footprint of the loader itself. The term "skid steer" traditionally refers to a loader having a skid steer with wheels as traction elements as described above. However, it should be noted that many crawler loaders can complete turns by skidding even without wheels, and they are technically skid steer loaders. For the purposes of this discussion, unless otherwise specified, the term "skid steer" should not be considered to limit the scope of the discussion to those loaders with wheels as traction elements. Correspondingly, although some of the example power machines discussed herein are presented as skid steer power machines, some of the examples disclosed herein can be implemented on various other power machines (e.g., on compact loaders or compact excavators that do not achieve turns by skid steer control).

[0059] Loader 200 is Figure 1 1 and discussed above. To this end, the features of the loader 200 described below include generally similar Figure 1200 are described herein to provide a reference for understanding an environment in which examples related to track assemblies and mounting elements for mounting track assemblies to power machinery can be practiced. The loader 200 should not be considered as a limitation, especially for the description of the features of the loader 200 described herein, which are not essential to the disclosed technology and may or may not be included in power machinery other than the loader 200 in which the technology disclosed below can be advantageously practiced. Unless otherwise specifically noted, the examples disclosed below can be practiced on various power machinery, of which the loader 200 is only one of those power machinery. For example, to name just a few examples, some or all of the concepts discussed below can be implemented on many other types of work vehicles such as various other loaders, excavators, trenchers, and bulldozers.

[0060] The loader 200 includes a frame 210 that supports a power system 220 that can generate or otherwise provide power for operating various functions on the power machine. The power system 220 is shown in block diagram form, but the power system 220 is located within the frame 210. The frame 210 also supports a working element in the form of a lift arm assembly 230 that is powered by the power system 220 and can perform various work tasks. When the loader 200 is a work vehicle, the frame 210 also supports a traction system 240 that is powered by the power system 220 and can push the power machine on a supporting surface. The lift arm assembly 230 in turn supports an implement interface 270, which includes an implement carrier 272 and a power coupler 274, which can receive and secure various implements to the loader 200 for performing various work tasks, and the implement can be coupled to the power coupler 274 to selectively provide power to the implement that can be connected to the loader. The power coupling 274 can provide a hydraulic or electrical source, or both. The loader 200 includes a cab 250 defining an operator station 255 from which an operator can manipulate various controls 260 to cause the power machine to perform various work functions. The cab 250 can be rearwardly pivoted about an axis extending through the mounting frame 254 to provide access to power system components as needed for maintenance and repair.

[0061] The operator station 255 includes a driver's seat 258 and a plurality of operator input devices, including control levers 260 that the operator can manipulate to control various machine functions. The operator input devices may include buttons, switches, levers, slides, pedals, etc., and may be stand-alone devices (such as manual levers or foot pedals) or incorporated into handles or display panels (including programmable input devices). Activation of the operator input device may generate a signal in the form of an electrical signal, a hydraulic signal, or a mechanical signal. The signals generated in response to the operator input device are provided to various components on the power machine to control various functions on the power machine. Among the functions controlled via the operator input devices on the power machine 200 are control of the traction element 219, the lift arm assembly 230, the implement carrier 272, and providing signals to any implement operably coupled to the implement.

[0062] The loader may include a human-machine interface, which includes a display device disposed in the cab 250, and provides an indication of information related to the operation of the power machine in a form that can be perceived by the operator, for example, an auditory indication or a visual indication. The auditory indication may be in the form of a buzzer, a bell, or the like, or may be carried out through verbal communication. The visual indication may be made in the form of a chart, a light, an icon, an instrument, an alphanumeric symbol, or the like. The display may provide a dedicated indication, such as a warning light or an instrument, or may dynamically provide programmable information, including a programmable display device such as a monitor of various sizes and capabilities. The display device may provide diagnostic information, troubleshooting information, guidance information, and various other types of information that help the operator operate the power machine or the implement connected to the power machine. Other information that may be useful to the operator may also be provided. Other power machines such as walk-behind loaders may not have a cab, an operator's cabin, or a seat. The operator position on such a loader is usually defined relative to the position where the operator is most suitable for manipulating the operator input device.

[0063] Various power machines that may include the embodiments discussed below, or interact with the examples discussed below, may have various different frame components that support various working elements. The elements of the frame 210 discussed herein are provided for illustrative purposes, and the frame 210 is not the only frame type that can be adopted by the power machine on which the disclosed technology can be practiced. The frame 210 of the loader 200 includes a chassis or lower portion 211 of the frame and a main frame or upper portion 212 of the frame supported by the chassis. In some examples, the main frame 212 of the loader 200 is attached to the chassis 211, such as with fasteners or by welding the chassis to the main frame. Alternatively, the main frame and chassis can be formed integrally. The main frame 212 includes a pair of upright portions 214A and 214B located on either side of the main frame and toward the rear of the main frame, the rear of the main frame supporting the lifting arm assembly 230 and the lifting arm assembly 230 being pivotably attached to the rear of the main frame. The lift arm assembly 230 is illustratively pinned to each upright portion 214A and 214B. For the purposes of this discussion, the mounting features and mounting hardware located on the upright portions 214A and 214B and the lift arm assembly 230 (including the pins used to pin the lift arm structure to the main frame 212) are collectively referred to as joints 216A and 216B (one joint is located on each upright portion 214). The joints 216A and 216B are aligned along an axis 218 so that the lift arm assembly can pivot about the axis 218 relative to the frame 210, as discussed below. Other power machines may not include upright portions on either side of the frame, or may not have a lift arm assembly mountable on an upright portion on either side of the frame and toward the rear of the frame. For example, some power machines may have a single arm that is mounted to a single side of the power machine or to the front or rear end of the power machine. Other machines may have multiple working elements including multiple lift arms, each mounted to the machine in its own configuration.The frame 210 also supports a pair of tractive elements in the form of wheels 219A-D on either side of the loader 200.

[0064] Figures 2 to 3The lift arm assembly 230 shown in the figure is an example of many different types of lift arm assemblies that can be attached to a power machine, such as a loader 200 or other power machines on which the disclosed technology can be practiced. The lift arm assembly 230 is known as a vertical lift arm, which means that the lift arm assembly 230 can move along a lift path 237 that forms a generally vertical path relative to the frame 210 under the control of the loader 200 (i.e., the lift arm assembly can be raised and lowered). Other lift arm assemblies can have different geometries and can be coupled to the frame of the loader in various ways to provide a lift path that is different from the radial path of the lift arm assembly 230. For example, some lift paths on other loaders provide radial lift paths. Other lift arm assemblies can have extendable or telescopic portions. Other power machines can have multiple lift arm assemblies attached to the frame of the power machine, each of which is independent of each other. Unless otherwise specifically stated, the inventive concepts set forth in this discussion are not limited by the type or number of lift arm assemblies that are coupled to a particular power machine.

[0065] The lift arm assembly 230 has a pair of lift arms 234 disposed on opposite sides of the frame 210. A first end 232A of each lift arm 234 is pivotally coupled to the power machine at a joint 216, and a second end 232B of each lift arm is pivotally coupled to the power machine at a joint 216. Figure 2 210. The joint 216 is positioned toward the rear of the loader 200 so that the lift arm extends along the side of the frame 210. A lift path 237 is defined by the path of travel of the second end 232B of the lift arm 234 when the lift arm assembly 230 moves between a minimum height and a maximum height.

[0066] Each lift arm 234 has a first portion 234A pivotally coupled to the frame 210 at one of the joints 216 and a second portion 234B extending from its connection to the first portion 234A to a second end 232B of the lift arm assembly 230. The lift arms 234 are each coupled to a cross member 236 attached to the first portion 234A. The cross member 236 provides increased structural stability to the lift arm assembly 230. Pairs of actuators 238 (the actuators on the loader 200 are hydraulic cylinders configured to receive pressurized fluid from the power system 220) are pivotally coupled to both the frame 210 and the lift arms 234 at pivotable joints 238A and 238B, respectively, on either side of the loader 200. The actuators 238 are sometimes referred to individually and collectively as lift cylinders. Actuation (i.e., extension and retraction) of the actuator 238 causes the lift arm assembly 230 to pivot about the joint 216, thereby raising and lowering along a fixed path illustrated by arrows 237. Each of the pair of control links 217 is pivotally mounted to the frame 210 and one of the lift arms 234 located on either side of the frame 210. The control links 217 help define the fixed lift path of the lift arm assembly 230.

[0067] Some lift arms (most notably those on excavators, but possibly those on loaders as well) may have a section that is controllable to pivot relative to another section, rather than Figure 2 230 shown in FIG. 2. Some power machines have a lift arm assembly with a single lift arm, such as is known in excavators and even in some loaders and other power machines. Other power machines may have multiple lift arm assemblies, each lift arm assembly being independent of another (other) lift arm structure.

[0068] The implement interface 270 is disposed proximate the second end 232B of the lift arm assembly 234. The implement interface 270 includes an implement carrier 272 that is capable of receiving and securing a variety of different implements to the lift arm 230. Such implements have a complementary mechanical interface configured to engage with the implement carrier 272. The implement carrier 272 is pivotally mounted at the second end 232B of the arm 234. An implement carrier actuator 235 operably couples the lift arm assembly 230 and the implement carrier 272 and is operable to rotate the implement carrier relative to the lift arm assembly. The implement carrier actuator 235 is illustratively a hydraulic cylinder and is commonly referred to as a tilt cylinder.

[0069] By having an implement carrier that can be attached to a number of different implements, changing from one implement to another can be accomplished relatively easily. For example, a machine having an implement carrier can have an actuator disposed between the implement carrier and the lift arm assembly so that removal or attachment of an implement does not involve removal or attachment of the actuator from the implement, nor does it involve removal or attachment of the implement from the lift arm assembly. The implement carrier 272 provides a mounting structure for easily attaching an implement to the lift arm (or other portion of the power machine), whereas a lift arm assembly without an implement carrier would not have such mounting structure.

[0070] Some power machines may have multiple implements or implements similar to devices attached to the power machine, such as by pinning to a lift arm having a tilt actuator that is also directly coupled to the implement or implement-type structure. A common example of such an implement that is rotatably pinned to the lift arm is a bucket, where one or more tilt cylinders are attached (e.g., by welding or fasteners) to a bracket that is fixed directly to the bucket. Such a power machine does not have an implement carrier, but rather has a direct connection between the lift arm and the implement.

[0071] The implement interface 270 also includes an implement power source 274 that can be used to connect to an implement on the lift arm assembly 230. The implement power source 274 includes a pressurized hydraulic fluid port to which the implement can be removably connected. The pressurized hydraulic fluid port selectively provides pressurized hydraulic fluid for powering one or more functions or actuators on the implement. The implement power source can also include an electrical source for powering an electrical actuator or electronic controller on the implement. The implement power source 274 also illustratively includes an electrical conduit that communicates with a data bus on the excavator 200 to allow communication between a controller on the implement and an electronic device on the loader 200.

[0072] The frame 210 supports and generally surrounds the power system 220 so that the various components of the power system 220 are Figures 2 to 3 It is not visible. Figure 4In particular, a diagram of various components of the power system 220 is included. The power system 220 includes one or more power sources 222, which can generate or store power for various mechanical functions. On the power machine 200, the power system 220 includes an internal combustion engine. Other power machines may include generators, rechargeable batteries, various other power sources, or any combination of power sources that can provide power for a given power machine component. The power system 220 also includes a power conversion system 224, which is operably connected to the power source 222. The power conversion system 224 is then connected to one or more actuators 226, which can perform functions on the power machine. The power conversion system in various power machines may include various components, including mechanical transmissions, hydraulic systems, etc. The power conversion system 224 of the power machine 200 includes a pair of hydraulic drive pumps 224A and 224B, which can be selectively controlled to provide power signals to drive motors 226A and 226B. The drive motors 226A and 226B are in turn each operably coupled to a shaft, wherein the drive motor 226A is coupled to shafts 228A and 228B, and the drive motor 226B is coupled to shafts 228C and 228D. The shafts 228A to 228D are in turn coupled to traction elements 219A to 219D, respectively. The drive pumps 224A and 224B can be mechanically, hydraulically or electrically coupled to an operator input device to receive an actuation signal for controlling the drive pumps.

[0073] The arrangement of the drive pump, motor, and shaft in power machine 200 is only one example of an arrangement of these components. As discussed above, power machine 200 is a skid steer loader, and thus the traction elements on each side of the power machine are controlled together via the output of a single hydraulic pump, either by a single drive motor as in power machine 200 or by separate drive motors. Various other configurations and combinations of hydraulic drive pumps and motors may be employed as may be advantageous.

[0074] The power conversion system 224 of the power machine 200 also includes a hydraulic actuator pump 224C, which is also operably connected to the power source 222. The hydraulic actuator pump 224C is operably connected to the working actuator circuit 238C. The working actuator circuit 238C includes a lift cylinder 238 and a tilt cylinder 235, and a control logic device for controlling their actuation. The control logic device selectively allows the lift cylinder or the tilt cylinder to be actuated in response to an operator input. In some machines, the working actuator circuit 238C also includes a control logic device for selectively providing pressurized hydraulic fluid to the attached machine. The control logic device of the power machine 200 includes an open center 3-way spool valve arranged in series. The valve core is arranged to prioritize the lift cylinder, then the tilt cylinder, and then the pressurized fluid to the attached machine.

[0075] For illustrative purposes, the above description of power machine 100 and loader 200 is provided to provide an illustrative environment on which the examples discussed below can be practiced. Although the examples discussed can be practiced on power machines, such as those typically comprised of Figure 1 The present invention will be described with reference to the power machine 100 shown in the block diagram of FIG. 1 , and more particularly as located on a loader such as a track loader 200 , but unless otherwise noted or described, the concepts discussed below are not intended to limit their application to the environment specifically described above.

[0076] Figure 5A and Figure 5B The figures illustrate an air intake system 300 for a power source 220 (e.g., an internal combustion engine) of a particular configuration of a loader 200. As shown in these figures, the loader 200 may include a front end 280, a rear end 282 opposite the front end 280, a first lateral side 284 (e.g., a left side), and a second lateral side 286 (e.g., a right side) opposite the first lateral side 284. In the illustrated example, the cab 250 and the operator station 255 (see Fig. 7A and Figure 7B ) is arranged at the front end 280 of the loader 200, and the power source 220 is arranged at the rear end 282 of the loader 200. In other examples, other configurations of the cab / operator station and the power source are possible. For example, the operator station can be arranged at the rear end of the loader, and the power source can be arranged at the front end, or between the front end and the rear end.

[0077] The air intake system 300 is configured to provide air from outside the loader 200 to the power source 220. The air intake system includes an air inlet 302, a filter assembly 304, a first air duct 306, and a second air duct 308. The filter assembly 304 may include a filter enclosure 310 and a filter element (not individually numbered).

[0078] The air inlet 302 may include a protruding (or other) housing coupled to an exterior panel 330 of the loader 200 (see Fig. 7A ). The air inlet 302 is shown as a protruding angled housing formed separately from the exterior panel 330, but some air inlets may be integrally formed with an exterior panel of the power machine or may take on other geometric shapes.

[0079] The first air duct 306 may be coupled between the air inlet and the enclosure 312 of the frame 210 of the loader. Thus, the duct 306 may define a first (upstream) flow path through the first air duct 306 between the outlet of the air inlet 302 and the inlet of the enclosure 312 (e.g., at the top side of the enclosure 312, such as Figure 6 310 ). The second air duct 308 may be coupled between the enclosure 312 and the filter enclosure 310. Thus, the duct 306 may define a second (downstream) flow path through the second air duct 308 between the outlet of the enclosure 312 and the inlet of the filter enclosure 310 (e.g., at the rear side of the bottom end of the housing 310, as shown in FIG. 310 ). Figure 6 ).

[0080] While the illustrated configuration may provide certain advantages, including those discussed below, other relative locations of components along the intake flow path are possible. For example, the filter enclosure may be positioned differently, correspondingly altering the flow path between the outlet of the enclosed frame compartment and the ultimate engine or other power source.

[0081] According to the illustrated example, the air intake system 300 may also include a third air duct 314 (see FIG. 1 ) coupled between the filter enclosure 310 and an inlet of the power source 220 (eg, a turbine inlet, a throttle body, or an intake manifold). Figure 5A ). In other examples, filter enclosure 310 may be directly coupled to an inlet of power source 220 .

[0082] Thus, during operation, air entering the power source 220 is directed by the various noted structures to travel along an air intake path defined by the air inlet 302, the first air duct 306, the enclosure 312, and the second air duct 308 before entering the filter enclosure 310. The air may then continue from the filter enclosure 310 through the duct 314 (if included) to the power source 220.

[0083] Reference now Figure 5C , the enclosed cabin 312 of the frame 210 is formed by the hollow frame members 313 of the frame 210, so that the air passing through the air intake system enters the enclosed cabin 312 from the first air duct 306 and exits the enclosed cabin 312 to the second air duct 308. Therefore, the enclosed cabin 312 of the frame 210 provides a conduit for the air flow between the air inlet 302 and the power source 220. In the illustrated example, the frame members 313 form a vertically extending structure that is configured to support the lifting arm structure 230 (see Figure 2 ) for pivotal movement relative to the power machine frame 210. In particular, the enclosed cabin 312 can intersect with a joint 216C configured to provide a pivot point for the linkage arm of the lifting arm structure 230, or the frame member 313 can otherwise include the joint. In some cases, this combined use of the cabin 312 (including the surrounding structure) can provide particularly significant packaging efficiencies.

[0084] The enclosed cabin 312 may be formed to include a first side 316 (e.g., a side facing the top of the loader 200, or a top side) and a second side 318 (e.g., a side facing the rear end 282 of the loader 200, or a rear side). In the illustrated example, a first opening is included on the first side 316, the first opening being configured to receive air flow from the first air duct 306 that is also coupled to the first side 316. Similarly, a second opening is included on the second side 318, the second opening being configured to provide air flow from the enclosed cabin 312 to the second air duct 308 that is also coupled to the second side 318.

[0085] The enclosed cabin can generally include sufficient boundary structure so that substantially all (e.g., 95% or more) of the air that flows into the cabin via the intake flow path also flows out of the cabin via the intake flow path. In the illustrated example, in addition to the inlet opening and outlet opening for the air intake flow path, there are additional openings (e.g., Figure 5CHowever, during assembly of the power machine, those openings may be covered with rubber gaskets, foam seals, or other sealing devices to isolate the enclosed compartment 312 from an engine compartment 322 also defined by the frame 210 to house the power source 220. With such a properly configured seal, hot and dirty air within the engine compartment 322 is generally prevented from entering the enclosed compartment 312 in the frame 210.

[0086] In this regard, the enclosure 312 may include holes, channels, gaps in welds, or other openings formed to allow communication or power signals to pass through, or to allow water within the enclosure 312 to drain (e.g., water from condensation within the enclosure 312). Accordingly, the enclosure 312 may not be completely sealed, but may still be configured to remain isolated from the engine compartment 322 along an operational flow path for engine air intake, cooling, exhaust, etc.). As such, the enclosure 312 may sometimes form a sealed compartment that is configured to allow some operational leakage of air in an amount that is substantially less than the expected operational air flow (e.g., 5% to 10% or less of the flow volume).

[0087] As discussed herein, a first cabin is considered to be isolated from another cabin if the first cabin is mechanically closed to prevent air flow to the second cabin. For example, the seals, structural welds, and interfaces of the stacked structure of the cabins can isolate the cabin from another cabin by substantially inhibiting air flow from leaving the cabin and entering another cabin, compared to the operating air flow through the operating air flow opening (i.e., the opening designed in the cabin wall for flow along the operating air flow path). In other words, for some examples, the structural form of the cabin and the added interface (e.g., seal) can ensure that the operating air flow from the cabin through the designated flow opening substantially exceeds the other concurrent air flow from the cabin to another specific area (e.g., exceeds the flow to another cabin by 85%, 90%, 95%, 98%, 99%, etc.).

[0088] refer to Figure 6 , the inlet 302 can be arranged generally in front of the power source 220 (e.g., in front of the midpoint of the crankshaft) to help provide properly cooled and clean air. In the illustrated example, the inlet 302 is arranged completely in front of the power source 220, but other locations are possible. For example, the power source 220 can be defined by a length between a pulley at a first end of the crankshaft and a flywheel at a second end of the crankshaft, with the second end of the crankshaft facing the front end 280 of the loader 200. In some examples, relative to such a length, the first air duct 306 can be advantageously arranged in front of the midpoint of the power source 220.

[0089] Reference now 7A to 7C, the air inlet 302 of the air intake system 300 may be arranged behind the cab 250. In the illustrated example, the air inlet 302 is arranged between the cab 250 and the cooling outlet 324, and in particular, is arranged in front of the cooling outlet 324. The cooling outlet 324 is configured to allow hot air to escape the engine compartment 322 after the air has passed through the radiator 322. Therefore, the air inlet 302 being arranged in front of the cooling outlet 324 allows the air inlet 302 to receive relatively cool air (i.e., the air inlet 302 is configured to draw in cooler ambient air rather than the hotter air that exits through the cooling outlet 324).

[0090] The air inlet 302 may include one or more openings to allow air to enter the air intake system 300. In the illustrated example, in particular, Figure 7B and Figure 7C , the air inlet 302 is formed with a shroud that includes a first opening 326 disposed on a front side of the air inlet 302 facing the front end 280 of the loader 200 (e.g., facing the cab 250 and away from the cooling outlet 324). The air inlet 302 may also include a second opening 328 disposed on a lateral side of the air inlet 302 facing the first lateral side 284 of the loader 200. In the illustrated example, the first opening 326 includes a first array of openings (e.g., three screen ports, as shown) along the front side of the air inlet 302. In some examples, successively larger openings may be provided toward the outside of the air inlet 302 (e.g., at a greater distance from the outside of the cooling outlet 324) because improved intake and internal air flow characteristics may be provided, including relatively hotter air from the cooling outlet 324.

[0091] In the illustrated example, the shroud of the air inlet 302 is closed to air flow (i.e., no air intake opening is present) on the rear side of the air inlet 302 that faces the rear end 282 of the loader 200 (i.e., toward the cooling outlet 324 and away from the cab 250). This may also help to isolate the air inlet 302 from hot air exiting the cooling outlet 324. In the illustrated example, the shroud of the air inlet 302 is also closed to air flow (i.e., no opening is present) on the opposite lateral side of the air inlet 302 that faces the second lateral side 286 of the loader 200 (i.e., facing a potential stagnant or eddy area of ​​the cooling outlet 324). This arrangement may also result in improved quality (e.g., cooler temperature, cleaner composition) of the air flow entering the air inlet 302.

[0092] Including substantially vertical or substantially horizontal flows in selected areas of an air intake system can generally help improve the flow efficiency of the system, including by reducing the overall complexity of the air flow and simplifying the efforts to maintain proper separation of the intake air flow from hotter air flows (e.g., cooling flows) or multiple areas (e.g., an engine compartment). In some examples, the enclosed flow paths within the frame members can provide improved air flow arrangements relative to including such horizontal or vertical (or otherwise substantially linear) flow paths (e.g., in addition to providing an improved flow path for cooler air intake as discussed above). In some cases, such benefits can also arise for flow paths that are substantially horizontal or vertical from a particular perspective (e.g., a side elevation view) but may deviate from horizontal or vertical from another perspective (e.g., a top plan view, or a rear elevation view). As an example, particularly as shown from the rear of the engine, such flow paths may be substantially horizontal or vertical from a particular perspective (e.g., a side elevation view) but may deviate from horizontal or vertical from another perspective (e.g., a top plan view, or a rear elevation view). Figure 5B As shown in the side elevation view of FIG. 3 , the flow path along the first air duct 306 between the air inlet 302 and the closed frame cabin 312 can be substantially vertical. Similarly, the flow path along the second air duct 308 from the closed cabin 312 toward the engine can be substantially horizontal.

[0093] Indeed, in the illustrated example (from a side elevation perspective), a substantially vertical flow path extending in length is provided between the air inlet and a bottom portion of the frame bay 312 (i.e., the portion of the substantially horizontal flow path from the frame air outlet that directs the air flow into the first air duct 306 as shown). Furthermore, also due in part to the configuration of the frame bay 312, the second air duct 308 can define a substantially horizontal flow path from the frame bay over a relatively large distance (e.g., over a majority of the length of the duct 308). For example, as Figure 5B As shown in FIG. 1 , the second air duct 308 can define a substantially horizontal flow path from the frame compartment 312 to the rear portion of the engine 322, which is aligned with the inlet of the filter assembly 304 along the vertical reference line 321. Thus, the extended length of this substantially horizontal flow path can also allow for another substantially vertical flow path extending upward to the filter assembly 304. In addition, as shown in FIG. Figure 5D and Figure 5E As illustrated in FIG. 1 (from a top plan view), the flow path along the second air duct 308 defines a path for operating air flow between the frame compartment 312 (e.g., from a compartment outlet opening) and the filter assembly 304 that is substantially parallel to the fore-aft axis of the power machine (e.g., centerline 320).

[0094] Although the presently disclosed technology has been described with reference to preferred implementations, workers skilled in the art will recognize that changes may be made in form and detail without departing from the scope of the present discussion.

[0095] As used herein, unless otherwise limited or qualified, "or" represents a non-exclusive list of components or operations that can exist in any kind of combination, rather than an exclusive list of components that can exist only as alternatives to each other. For example, a list of "A, B, or C" indicates the following options: A; B; C; A and B; A and C; B and C; and A, B, and C. Accordingly, the term "or" as used herein is intended to indicate exclusive alternatives only when preceded by an exclusive term, such as "any one," "one of," "only one of," or "exactly one of." For example, a list of "one of A, B, or C" indicates the following options: A, but not B and C; B, but not A and C; and C, but not A and B. A list preceded by "one or more" (and variations thereof) and including "or" for different listed elements refers to the option of one or more of any or all of the listed elements. For example, the phrases "one or more of A, B, or C" and "at least one of A, B, or C" indicate the following options: one or more A; one or more B; one or more C; one or more A and one or more B; one or more B and one or more C; one or more A and one or more C; and one or more of A, one or more of B, and one or more of C. Similarly, a list preceded by "plurality" (and variations thereof) and including "or" to different listed elements refers to the option of multiple instances of any or all of the listed elements. For example, the phrases "plurality of A, B, or C" and "two or more of A, B, or C" indicate the following options: A and B; B and C; A and C; and A, B, and C.

[0096] As also used herein, unless otherwise limited or defined, "substantially parallel" means a direction within ±12 degrees (e.g., within ±6 degrees or ±3 degrees) of a reference direction, inclusive. Accordingly, "substantially vertical" means a direction substantially parallel to a vertical direction, as defined relative to a reference system (e.g., for a power machine, as defined relative to a horizontal support surface on which the power machine is operably located), with similar derivative meanings for "substantially horizontal." For a path that is not linear, a path may be considered substantially parallel to a reference direction if a straight line between the endpoints of the path is substantially parallel to the reference direction or the mean derivative (i.e., the average local slope) of the path within a common reference system, because the reference direction is substantially parallel to the reference direction.

[0097] As also used herein, unless otherwise limited or restricted, "substantially perpendicular" means a direction within ±12 degrees (e.g., within ±6 degrees) of perpendicular to a reference direction, inclusive. For a path that is not linear, if a straight line between the endpoints of the path is substantially perpendicular to the reference direction or the mean derivative (i.e., average local slope) of the path within a common reference frame, then the path can be considered to be substantially perpendicular to the reference direction because the reference direction is substantially perpendicular to the reference direction.

[0098] Also as used herein in the context of a power machine, unless otherwise defined or limited, the term "lateral" refers to a direction extending at least partially to the left or right of a fore-aft reference line defined by the power machine (e.g., Figure 5C Thus, for example, a lateral sidewall of a cab of a power machine may be a left side wall or a right side wall of the cab relative to a reference frame of an operator within the cab or otherwise oriented to operably engage controls at an operator station of the cab. Similarly, the “centerline” of a power machine (e.g., Figure 5C The centerline 320 of the power machine refers to a reference line extending in the front-to-rear direction of the power machine, approximately halfway between the opposite lateral sides of the outer spatial envelope of the power machine. Also as used herein, unless otherwise specified, the terms "about" and "approximately" mean plus or minus 5% of the number preceding each term.

[0099] Also as used herein, unless otherwise defined or limited, the terms "inboard" and "outboard" refer to the relative relationship (e.g., lateral distance) between one or more objects or structures and the centerline of the power machine along the lateral side of the power machine. For example, a first structure that is inboard of a second structure is positioned laterally inward from the second structure, such that the distance between the first structure and the centerline of the power machine is less than the distance between the second structure and the centerline of the power machine. Conversely, a first structure that is outboard of a second structure is positioned laterally outward from the second structure, such that the distance between the first structure and the centerline of the power machine is greater than the distance between the second structure and the centerline of the power machine.

[0100] Similarly, as used herein, unless otherwise defined or limited, the terms "interior" and "exterior" refer to the relative relationship (e.g., lateral distance) between the centerline of one or more structures (e.g., substructures) and a reference structure (e.g., main structure), the centerline extending in the fore-aft direction or between the first end and the second end of the reference structure. For example, the interior structure is disposed closer to the centerline of the reference structure than the exterior structure. In this regard, an exterior structure of a subassembly of a power machine may also be an exterior structure. In contrast, an exterior structure of a subassembly may not necessarily be outside of other components of the subassembly relative to the centerline of the subassembly.

[0101] In some implementations, the devices or systems disclosed herein may be utilized, manufactured, installed, etc. using methods that embody aspects of the disclosed techniques. Accordingly, any description herein of a particular feature, capability, or intended purpose of a device or system is generally intended to include disclosure of methods for using such a device for the intended purpose, otherwise achieving such capability, manufacturing related components of such a device or system (or the device or system as a whole), and installing disclosed (or otherwise known) components to support such purpose or capability. Similarly, unless otherwise indicated or limited, discussion herein of any method of manufacturing or using a particular device or system (including installing the device or system) is intended to inherently include disclosure of the utilized features and achieved capabilities of such a device or system as an example of the disclosed techniques.

Claims

1. A power machine (200), comprising: A frame (210) comprising a hollow frame member (313) forming a closed frame compartment (312) having a compartment inlet opening, a compartment outlet opening, and a closed flow path between the compartment inlet opening and the compartment outlet opening; an engine (220) supported by the frame (210) and enclosed in an engine compartment (322) separate from the enclosed frame compartment (312); as well as An air intake system (300) for the engine, the air intake system comprising: an air inlet (302) coupled to an exterior panel of the power machine (200); A filter assembly (304) comprising a filter enclosure (310) and a filter element; a first air duct (306) defining a first flow path between the air inlet and the cabin inlet opening; and a second air duct (308) defining a second flow path between the cabin outlet opening and the filter enclosure (310); Wherein, the air intake system (300) guides the intake air flow to the engine (220) so that the intake air flow travels along an air intake path including the air inlet (302), the first flow path, the closed frame compartment (312), and a second flow path before entering the filter enclosure (310).

2. The power machine according to claim 1, wherein: The power machine (200) includes a cooling outlet (324) configured to exhaust air from the engine compartment (322); and The air inlet (302) is arranged to be located in front of the cooling outlet (324) relative to the front-rear axis (320) of the power machine.

3. The power machine (200) according to any one of the preceding claims, further comprising: Operator cabin; The air inlet (302) is arranged to be located behind the operator's cabin relative to the front-rear axis (320) of the power machine.

4. The power machine (200) according to any one of the preceding claims, wherein: The air inlet (302) is arranged to be located in front of the engine (220) relative to the fore-aft axis (320) of the power machine, and optionally or preferably, wherein the air inlet, the first flow path and the closed frame compartment (312) are arranged to be located in front of the engine relative to the fore-aft axis.

5. The power machine (200) according to any one of the preceding claims, wherein: The air inlet (302) comprises a first inlet opening (326) arranged on a first side (316) of the air inlet facing a front end (280) of the power machine, and optionally or preferably, the air inlet further comprises a second inlet opening (328) on a second side of the air inlet facing a lateral side (284) of the power machine.

6. The power machine (200) according to claim 5, wherein: The first air duct (306) extends from an inner side of the air inlet (302) such that the second flow path extends in an outer side direction from the air inlet to the cabin inlet opening.

7. The power machine (200) according to any one of the preceding claims, further comprising: a lifting arm (234) movably secured to the frame (210); Wherein the closed frame compartment (312) includes a joint (216) that supports a portion of the lifting arm for pivotal movement relative to the frame.

8. The power machine (200) according to any one of the preceding claims, wherein: The tank inlet opening is located at a top side of the closed frame tank (312), and optionally or preferably, wherein the tank outlet opening is located at a side of the closed frame tank facing the rear end (282) of the power machine.

9. The power machine (200) according to any one of the preceding claims, wherein: the first flow path and the closed flow path define a substantially vertical path for air flow between the air inlet and a bottom end of the closed frame compartment when viewed from a side elevation perspective; and Wherein, from a top plan view perspective, the second flow path defines a path for air flow between the cabin outlet opening and the filter assembly (304) that is substantially parallel to a fore-aft axis (320) of the power machine.

10. An air intake system (300) for a power machine (200), comprising: an air inlet (302) coupled to an exterior panel (330) of the power machine; A filter assembly (304) comprising a filter enclosure (310) and a filter element; a first air duct (306) connected between the air inlet and a closed frame compartment (312) of a frame (210) of the power machine; as well as a second air duct (308) coupled between the closed frame compartment (312) and the filter enclosure (310); The air intake system (300) guides the air flow to the filter assembly (304) so ​​that the air flow travels along an air intake path that sequentially includes the air inlet (302), the first air duct (306), the closed frame compartment (312), and the second air duct (308) before entering the filter enclosure (310).

11. The air intake system according to claim 10, wherein: The air inlet (302) includes a first opening (326) arranged on a first side of the air inlet facing a front end (280) of the power machine (200), and optionally or preferably, the air inlet also includes a second opening (328) on a second side of the air inlet facing a lateral side (284) of the power machine.

12. An air intake system according to any one of claims 10 or 11, wherein the first air duct (306) is connected to the top side of the closed frame compartment (312), and optionally or preferably, wherein the second air duct (308) is connected to a side of the closed frame compartment (312) facing the rear end (282) of the power machine (200).

13. The air intake system according to claim 11, wherein: From the side view perspective: The air intake path defines a substantially vertical first air flow path between the air inlet (302) and the closed frame compartment (312); and / or The air intake path defines a second air flow path that is substantially horizontal between the closed frame compartment and a rearward location that is aligned along a vertical axis with an air inlet (302) of the filter assembly (304).

14. A method of providing air to an engine (322) of a power machine (200), the method comprising: Drawing air into an air inlet (302) disposed on the exterior of the power machine; causing the air to flow from the air inlet through a first air duct (306) coupled between the air inlet (302) and a hollow frame member (313) of a frame (210) of the power machine; allowing the air to flow from the first air duct (306) through the closed frame compartment (312) of the hollow frame member (313); and The air is caused to flow from the closed frame compartment (312) through a second air duct (308) coupled between the closed frame compartment and a filter assembly (304) of the engine (322).

15. The method according to claim 14, further comprising: relative to a side elevation viewing angle, causing the air to flow along a substantially vertical flow path from the air inlet (302) to the hollow frame member (313); and The air is caused to flow from the hollow frame member (313) toward the engine (322) along a substantially horizontal flow path relative to a side elevation perspective.

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