Power machine and air intake system therefor

Abstract

This disclosure provides an air intake system (300) for a power machine (200), the air intake system using a hollow section of the frame (310) of the power machine to form part of an air intake path. The air intake system may include: an air inlet (302) connected to an external panel (330) of the power machine; a filter assembly (304) including a filter enclosure (310) and a filter element; a first air duct (306) connected between the inlet and a closed chamber (312) of the frame (210) of the power machine; and a second air duct (308) connected between the closed chamber and the filter enclosure; in order to reach the filter enclosure (310), air entering the filter enclosure may travel along an air intake path including the air inlet (302), the first air duct (306), the closed chamber (312), and the second air duct (308).

Description

[0001] Cross-references to related applications

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

[0003] This disclosure relates to power machinery. More specifically, the present invention relates to an air intake system for an internal combustion engine of power machinery. For the purposes of this disclosure, power machinery includes any type of machine that generates power for performing a particular task or various tasks. One type of power machinery is a work vehicle. Work vehicles are typically self-propelled vehicles with work attachments such as lifting booms that can be manipulated to perform work functions (although some work vehicles may have other work attachments). Work vehicles include loaders (including mini loaders), excavators, multi-purpose vehicles, lawnmowers, tractors (including compact tractors), and trenchers, to name just a few.

[0004] Power machinery, including internal combustion engines, includes an air intake system. An air intake system typically includes an air intake manifold that directs airflow to a filter element. The air filter element then filters the air entering the engine, whether through the compressor inlet on the turbocharger, the throttle body inlet, or the intake manifold / collector chamber.

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

[0006] This disclosure provides an improved air intake system for power machinery, comprising forming a portion of an air intake path for a power source (e.g., an engine) of the power machinery by using a hollow section of the frame of the power machinery. In some examples, a generally horizontal or generally vertical portion of the air intake flow path may be provided, including an intake air inlet in front of the engine (e.g., and also behind the cab or other operator station). In some examples, a suitably configured enclosed compartment of the frame member may facilitate the extension of both the horizontal and vertical portions of the flow path.

[0007] This disclosure provides a 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 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 that may be coupled to an external panel of the power machine; a filter assembly that may include a filter enclosure and filter elements; a first air duct that may define a first flow path between the air inlet and the compartment inlet opening; and a second air duct that may define a second flow path between the compartment outlet opening and the filter enclosure. The air intake system may direct intake airflow to the engine such that the intake airflow 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 machinery may include a cooling outlet configured to exhaust air from the engine compartment. The air inlet may be arranged in front of the cooling outlet relative to the front-rear axis of the power machinery.

[0009] In some examples, the air inlet may be arranged behind the operator's cabin of the power machinery relative to the front-rear axis of the power machinery.

[0010] In some examples, the air inlet may be arranged in front of the engine relative to the front-rear axis of the power machinery.

[0011] In some examples, the air inlet, the first flow path, and the enclosed frame compartment can be arranged in front of the engine relative to the front-rear axis.

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

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

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

[0015] In some examples, the enclosed frame cabin may include a joint that supports a portion of the lifting arm for pivoting relative to the frame.

[0016] In some examples, the cabin entrance opening may be located on the top side of the enclosed frame cabin.

[0017] In some examples, the cabin exit opening may be located on the rear side of the enclosed frame cabin facing the power machinery.

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

[0019] In some examples, from a top-down view, the second flow path may define a path for airflow between the cabin outlet opening and the filter assembly, the path being substantially parallel to the front and rear axes of the power machinery.

[0020] This disclosure provides an air intake system for (or included in) power machinery. 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 coupled to an external panel of the power machinery. The filter assembly may include a filter enclosure and filter elements. The first air duct may be coupled between the air inlet and an enclosed frame compartment of the frame of the power machinery. The second air duct may be coupled between the enclosed frame compartment and the filter enclosure. The air intake system may direct airflow to the filter assembly such that the airflow travels along an air intake path that may sequentially include the air inlet, the first air duct, the enclosed frame compartment, and the second air duct 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 the front end of the power machinery.

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

[0023] In some examples, the first air duct may be connected to the top side of the enclosed frame cabin.

[0024] In some examples, the second air duct may be connected to the rear end of the enclosed frame cabin facing the power machinery.

[0025] In some examples, from a side-view perspective, the air intake path may define a first airflow path that may be substantially vertical between the air inlet and the enclosed frame compartment.

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

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

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

[0029] In some examples, relative to the side-view perspective, air can flow from the hollow frame members toward the engine along a substantially horizontal flow path.

[0030] The summary and abstract of this invention are provided to present, in a simplified form, the selected concepts which will be further described in the detailed embodiments described below. The summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter. Attached Figure Description

[0031] The following figures are provided to illustrate various features of non-limiting examples of this disclosure and are not intended to limit the scope of this disclosure or exclude alternative embodiments.

[0032] Figure 1 It is a block diagram of a functional system of a representative power machine on which the disclosed technology can be advantageously practiced.

[0033] Figures 2 to 3 The illustration shows a perspective view of a representative powered machine in the form of a skid-steer loader, representing an example of the type on which the disclosed technology can be practiced.

[0034] Figure 4 It is a diagram showing something like in Figures 2 to 3 The diagram shows a block diagram of the power system components of a loader, such as a loader.

[0035] Figure 5A This is a rear perspective view of a representative power machine in the form of a skid-steering loader having an air intake system for an engine, according to one aspect of the invention, and shown with the various parts removed for clarity.

[0036] Figure 5B yes Figure 5A A side elevation view of the cross-section of the power machinery, in which the engine is hidden and certain components are rendered transparently for clarity.

[0037] Figure 5C yes Figure 5A A rear perspective view of the cross-section of the power machinery, with individual parts removed for clarity.

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

[0039] Figure 5E It is as follows Figure 5D The dashed area VE-VE in the figure is a top-view plan detail of a part of the power machinery.

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

[0041] Figure 7A yes Figure 5A The rear view outline of the power machinery shows the cab and some other components.

[0042] Figure 7B yes Figure 5A The left perspective view of the power machinery, with the same Figure 7A The same component is shown in the image.

[0043] Figure 7C yes Figure 5A The right perspective view of the power machinery, with the same Figure 7A The same component is shown in the image. Detailed Implementation

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

[0045] There are various challenges to consider when designing air intake systems for power machinery. These include supplying clean air to the engine and supplying cool air to the engine. For example, loaders or other power machinery often operate in dusty, dirty environments, and some internal compartments (such as the engine compartment) are not completely sealed off from the external environment. Furthermore, other airflows for the power machinery may introduce unwanted heat and dust into areas surrounding the machinery from which air is typically drawn in. For example, the cooling paths of the power machinery (e.g., the path of air drawn in through a radiator and exhausted to the outside of the power machinery via a cooling fan) contain air that typically carries dirt and dust from the environment. The air within the cooling paths is also typically hotter than ambient air because its temperature increases as it passes through the radiator, and is otherwise exposed to heat from the engine compartment.

[0046] While heat exchangers and filter elements are commonly used to help address some of the challenges highlighted above, further improvements to conventional air intake systems are possible. For example, some arrangements disclosed herein can be used to improve the cleanliness and coolness of the air supplied at the inlet of the air intake system, as well as the efficiency of this airflow. By ensuring that cooler, cleaner air enters the air intake system, the lifespan of filter elements and engine performance can be increased, as can the overall efficiency of the powertrain of the motor.

[0047] For example, certain configurations of the flow paths and related components for an air intake system can advantageously arrange the air intake system inlet spaced apart from the engine compartment. Accordingly, some configurations disclosed herein can provide the engine of the power machinery with colder and cleaner air than conventional systems. In some cases, the air intake system may include an inlet specifically arranged at a location that reduces the intake of dust and heat from the environment and from the engine's cooling paths (e.g., radiators, outlet vents, cooling fans, etc.). For example, the flow duct may be arranged such that the air inlet is in front of the engine compartment, appropriately spaced from the rearward outflow of cooling air, or the air inlet may have an intake inlet (e.g., a screen port) facing away from the engine compartment.

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

[0049] In some of the flow systems (and corresponding cooling methods) disclosed herein, flow paths through hollow frame members can also contribute to the encapsulation of internal areas of the loader and other spatial constraints (e.g., within an outer envelope defined by the loader's main frame and external or support panels). Under conventional approaches, these constraints can make designing an intake system that provides optimal and efficient flow characteristics challenging. For example, encapsulation constraints within the engine compartment can be particularly restrictive when attempting to avoid designs with inherent inefficiencies relative to airflow (e.g., excessively coiled flow paths). In some cases, hollow frame members with enclosed flow paths not only provide improved flow and space efficiency themselves but can also allow for other, more efficient flow ducts for other portions of the air intake path (e.g., ducts providing extensions of substantially horizontal or substantially vertical airflow between the air inlet and the engine).

[0050] These concepts can be implemented in various powered machines, as will be described below. Figure 1 The diagram illustrates representative powered machines on which the disclosed technology can be practiced, and further examples are provided before the disclosure of additional examples. Figures 2 to 3 An example of such a powered machine is illustrated and described below. For the sake of brevity, only one powered machine is illustrated and discussed as a representative example. However, as mentioned above, the examples below may include those related to... Figures 2 to 3 The representative power machinery shown is practiced on any of a plurality of power machinery of different types. For the purposes of this discussion, the power machinery includes a frame, at least one working element, and a power source capable of providing power to said working element to complete the work task. One type of power machinery is a self-propelled work vehicle. A self-propelled work vehicle is a class of power machinery that includes a frame, a working element, and a power source capable of providing power to said working element. At least one of said working elements is an actuation system for moving the power machinery under power.

[0051] Figure 1This is a block diagram illustrating the basic system of the power machinery 100, which can be any of a variety of different types of power machinery, and the examples discussed below can be advantageously incorporated into the power machinery. Figure 1 The block diagram illustrates the various systems on the power machinery 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 machinery includes a frame, a power source, and working elements. The power machinery 100 has a frame 110, a power source 120, and working elements 130. Due to Figure 1 The power machinery 100 shown is a self-propelled work vehicle, and therefore also includes a traction element 140 and an operator station 150. The traction element 140 itself is a work element provided for moving the power machinery on a support surface, and the operator station 150 provides an operating position for controlling the work element of the power machinery. A control system 160 is provided to interact with other systems, thereby performing various work tasks at least in part in response to control signals provided by the operator. For example, the control system 160 may 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 correspondingly output commands for the operation of the power machinery.

[0052] Some work vehicles have working elements capable of performing specialized tasks. For example, some work vehicles have a boom to which implements, such as buckets, are attached, for example, via a pin-attachment arrangement. The working element (i.e., the boom) can be manipulated to position the implement for performing the task. In some cases, the implement can be positioned relative to the working element, such as by rotating the bucket relative to the boom to further position the implement. Under normal operation of such a work vehicle, the bucket is intended to be attached and in use. Such work vehicles can receive other implements by disassembling the implement / working element combination and reassembling another implement in place of the original bucket. However, other work vehicles are designed to be used with a wide variety of implements and have features such as Figure 1 The tool interface 170 shown is a tool interface. At its most basic, the tool interface 170 is a connection mechanism between the frame 110 or the working element 130 and the tool. The connection mechanism can be as simple as a connection point for directly attaching the tool to the frame 110 or the working element 130, or it can be more complex, as discussed below.

[0053] In some power machinery, the implement interface 170 may include an implement carrier, which is a physical structure movably attached to a working element. The implement carrier has engagement and locking features to receive any one of a plurality of different implements and secure it to the working element. A characteristic of such an implement carrier is that once the implement is attached to it, 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. As used herein, the term "implement carrier" is not merely a pivoting connection point, but a dedicated device specifically designed to receive and secure various different implements. The implement carrier itself may be mounted to a working element 130 such as a lifting boom or frame 110. The implement interface 170 may also include one or more power sources for supplying power to one or more working elements on the implement. Some power machinery may have multiple working elements with implement interfaces, each working element may, but need not, have an implement carrier for receiving implements. Some other power machinery may have working elements with multiple tool interfaces, allowing a single working element to receive multiple tools simultaneously. Each of these tool interfaces may, but does not necessarily, have a tool carrier.

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

[0055] Frame 110 supports power source 120, which is configured to power 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 for use by attached implements via implement interface 170. Power from power source 120 may be provided directly to any of the working elements 130, traction elements 140, and implement interface 170. Alternatively, power from power source 120 may be provided to control system 160, which in turn selectively powers elements capable of using power to perform working functions. Power sources for power machinery typically include engines (such as internal combustion engines) and power conversion systems (such as mechanical transmissions or hydraulic systems) configured to convert the output from the engine into a form of power usable by the working elements. Other types of power sources may be incorporated into the power machine, including power sources or combinations of power sources typically known as hybrid power sources.

[0056] Figure 1 A single working element designated as working element 130 is shown, but individual power machines may have any number of working elements. Typically, a 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 discussed above, a working element may include a lifting arm assembly. In some examples, a working element may include a lawnmower deck or other similar equipment. Additionally, traction element 140 is a special case of a working element because the working function of a traction element is typically to move the power machine 100 on a supporting surface. Traction element 140 is shown separate from working element 130 because many power machines have additional working elements besides traction elements, although this is not always the case. A power machine may have any number of traction elements, some or all of which may receive power from power source 120 to propel the power machine 100. Traction elements may be, for example, track assemblies, wheels attached to axles, etc. The traction element can be mounted to the frame such that the movement of the traction element is restricted to rotation about an axis (so that steering is achieved by sliding action), or alternatively, the traction element can be pivotally mounted to the frame to achieve steering by pivoting the traction element relative to the frame.

[0057] Power machinery 100 includes an operator station 150, which includes an operating position from which an operator can control the operation of the power machinery. In some power machinery, the operator station 150 is defined by an enclosed or partially enclosed cab. Some power machinery on which the disclosed technology can be practiced may not have a cab or operator's cabin of the type described above. For example, a walk-following loader may not have a cab or operator's cabin, but instead has an operating position that serves as an operator station from which to properly operate the power machinery. More generally, power machinery other than work vehicles may have operator stations that are not necessarily similar to the operating positions and operator's cabins mentioned above. In addition, instead of an operator station adjacent to or located on the power machinery, or other than an operator station adjacent to or located on the power machinery, some power machinery (such as power machinery 100) may also be able to be remotely operated (i.e., operated from a remotely located operator station). This can include applications where at least some of the operator control functions of the power machinery can be operated from an operating position associated with the implement connected to the power machinery. Alternatively, in the case of some power machinery, a remote control device (i.e., remote from both the power machinery and any implements connected to it) capable of controlling at least some of the operator control functions on the power machinery can be provided.

[0058] Figures 2 to 3 The figure shows a loader 200, which is... Figure 1The illustration shows a specific example of a type of power machinery, in which the examples discussed below can be advantageously employed. Loader 200 is a skid-steer loader, which is a loader with traction elements (in this case, four wheels) mounted to the loader's frame via a rigid axle. Here, the term "rigid axle" refers to the fact that the skid-steer loader 200 does not have any traction elements that can be rotated or steered to assist the loader in turning. Alternatively, 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 machinery will tend to skid on the support surface. These varying signals can even include: powering the traction element on one side of the loader to move the loader in a forward direction, and powering one or more traction elements on the other side of the loader to move the loader in the opposite direction, such that the loader will turn about a radius centered within its own coverage area. The term "skid steering" traditionally refers to a loader with skid steering, as described above, using wheels as the traction element. However, it should be noted that many tracked loaders can turn by skidding even without wheels, and they are technically skid steering loaders as well. For the purposes of this discussion, unless otherwise stated, the term "skid steering" should not be construed as limiting the scope of the discussion to loaders using wheels as the traction element. Correspondingly, although some of the example motors discussed herein are presented as skid steering motors, some of the examples disclosed herein can be implemented in a variety of other motors, such as compact loaders or compact excavators that do not achieve turning via skid steering control.

[0059] Loader 200 is Figure 1 The diagram below provides a general illustration of a specific example of the power machinery 100 discussed above. For this purpose, the features of the loader 200 described below include those generally associated with... Figure 1Similar reference numerals are used in the accompanying drawings. For example, loader 200 is described as having a frame 210, just as power machine 100 has a frame 110. A skid-steer loader 200 is described herein to provide a reference for understanding an environment in which the examples described below relating to the track assembly and mounting elements for mounting the track assembly to the power machine can be practiced. Loader 200 should not be considered, in particular, as a limitation on the description of the features of loader 200 already described herein, features that are not essential to the disclosed technology and may therefore be included or excluded from power machines other than loader 200, where the technology disclosed below can be advantageously practiced. Unless otherwise specifically indicated, the examples disclosed below can be practiced on a variety of power machines, of which loader 200 is only one. For example, by way of a few examples only, 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 supporting a power system 220 capable of generating or otherwise providing power for operating various functions on the power machinery. The power system 220 is shown in block diagram form, but it is located within the frame 210. The frame 210 also supports a working element in the form of a boom assembly 230, powered by the power system 220 and capable of performing various work tasks. When the loader 200 is a work vehicle, the frame 210 also supports a traction system 240 powered by the power system 220 and capable of pushing the power machinery across a support surface. The boom assembly 230 then supports a implement interface 270, which includes an implement carrier 272 and a power connector 274. The implement carrier receives and secures various implements to the loader 200 for performing various work tasks, and the implements can be coupled to the power connector 274 to selectively provide power to implements that can be connected to the loader. The power connector 274 can provide a hydraulic or electrical power source, or both. The loader 200 includes a cab 250 defining an operator station 255 from which the operator can manipulate various control devices 260 to enable the power machinery to perform various operational functions. The cab 250 can pivot rearward about an axis extending through the mounting bracket 254 to provide access to the power system components as needed for maintenance and repair.

[0061] The operator station 255 includes a driver's seat 258 and multiple operator input devices, including a lever 260 that the operator can manipulate to control various mechanical functions. The operator input devices may include buttons, switches, levers, sliders, pedals, etc., and may be standalone devices (such as manual levers or foot pedals) or integrated into a handle or display panel (including programmable input devices). Activating the operator input device can generate a signal in the form of an electrical, hydraulic, or mechanical signal. Signals generated in response to the operator input device are provided to various components on the power machinery to control various functions on the power machinery. Functions controlled via the operator input devices on the power machinery 200 include control of the traction element 219, the lifting arm assembly 230, the implement carrier 272, and providing signals to any implements operatively connected to the implements.

[0062] The loader may include a human-machine interface (HMI) comprising a display device located in the cab 250, providing instructions related to the operation of the power machinery in a form perceptible to the operator, such as auditory or visual instructions. Auditory instructions may be in the form of beeps, bells, or verbal communication. Visual instructions may be in the form of charts, lights, icons, gauges, alphanumeric symbols, etc. The display may provide dedicated instructions, such as warning lights or gauges, or may dynamically provide programmable information, including programmable display devices such as monitors of various sizes and capacities. The display device may provide diagnostic information, troubleshooting information, guidance information, and various other types of information to assist the operator in operating the power machinery or implements connected to it. Other information that may be useful to the operator may also be provided. Other power machinery, such as walk-following loaders, may not have a cab, operator's cabin, or seat. The operator position on such a loader is typically defined relative to the position most suitable for the operator to manipulate the operator input devices.

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

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

[0065] The lifting arm assembly 230 has a pair of lifting arms 234 disposed on opposite sides of the frame 210. A first end 232A of each lifting arm 234 is pivotally connected to the power machinery at a joint 216, and a second end 232B of each lifting arm is positioned as follows: Figure 2 The lowering position shown is positioned in front of the frame 210. The connector 216 is positioned toward the rear of the loader 200 such that the lifting arm extends along the side of the frame 210. As the lifting arm assembly 230 moves between its minimum and maximum heights, the lifting path 237 is defined by the travel path of the second end 232B of the lifting arm 234.

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

[0067] Some booms (most notably those on excavators, but also those on loaders) can have a portion that can be pivoted relative to another segment, rather than... Figure 2 The lifting arm assembly 230 shown in the diagram moves uniformly (i.e., along a predetermined path). Some power machinery has a lifting arm assembly with a single lifting arm, as is known in excavators and even some loaders and other power machinery. Other power machinery may have multiple lifting arm assemblies, each independent of another (other) lifting arm structure.

[0068] A tool interface 270 is positioned near the second end 232B of the lifting arm assembly 234. The tool interface 270 includes a tool carrier 272 capable of receiving and securing various tools to the lifting arm 230. Such tools have complementary mechanical interfaces configured to engage with the tool carrier 272. The tool carrier 272 is pivotally mounted at the second end 232B of the arm 234. A tool carrier actuator 235 is operatively coupled to the lifting arm assembly 230 and the tool carrier 272, and operable to rotate the tool carrier relative to the lifting arm assembly. The tool carrier actuator 235 is exemplarily a hydraulic cylinder and is commonly referred to as a tilting cylinder.

[0069] By having a tool carrier capable of attaching to multiple different tools, the change from one tool to another can be accomplished relatively easily. For example, machinery with a tool carrier can have an actuator positioned between the tool carrier and the lifting arm assembly, such that removing or attaching the tool does not involve removing or attaching the actuator from the tool, nor does it involve removing or attaching the tool from the lifting arm assembly. Tool carrier 272 provides a mounting structure for easily attaching tools to the lifting arm (or other parts of the power machinery), while a lifting arm assembly without a tool carrier does not have such a mounting structure.

[0070] Some power machinery may have multiple implements or similar implements attached to it, for example, by pin-attachment to a lifting arm with a tilt actuator, which is also directly coupled to the implement or implement-type structure. A common example of such implements rotatably pinned to the lifting arm is a bucket, where one or more tilt cylinders are attached (e.g., by welding or fasteners) to a bracket directly fixed to the bucket. Such power machinery does not have implement carriers, but rather has a direct connection between the lifting arm and the implements.

[0071] The implement interface 270 also includes an implement power source 274, which can be used to connect to an implement on the lifting arm assembly 230. The implement power source 274 includes a pressurized hydraulic fluid port to which the implement can be removably coupled. 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 may also include an electrical source for powering electric actuators or electronic controllers on the implement. The implement power source 274 also exemplarily includes electrical conduits that communicate with a data bus on the excavator 200 to allow communication between controllers on the implement and electronics on the loader 200.

[0072] Frame 210 supports and substantially surrounds the power system 220, so that the various components of the power system 220 are in a position to... Figures 2 to 3 It is invisible in the middle. Figure 4The diagrams specifically include various components of the power system 220. The power system 220 includes one or more power sources 222 capable of generating or storing power for various mechanical functions. On the power machinery 200, the power system 220 includes an internal combustion engine. Other power machinery may include generators, rechargeable batteries, various other power sources, or any combination of power sources that can provide power to a given power machinery component. The power system 220 also includes a power conversion system 224 operatively coupled to the power source 222. The power conversion system 224 is then coupled to one or more actuators 226 capable of performing functions on the power machinery. The power conversion system in various power machinery may include various components, including mechanical transmissions, hydraulic systems, etc. The power conversion system 224 of the power machinery 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. Drive motors 226A and 226B are then operatively coupled to shafts, with drive motor 226A coupled to shafts 228A and 228B, and drive motor 226B coupled to shafts 228C and 228D. Shafts 228A to 228D are then 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 actuation signals for controlling the drive pumps.

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

[0074] The power conversion system 224 of the power machinery 200 also includes a hydraulic actuator pump 224C, which is operatively coupled to the power source 222. The hydraulic actuator pump 224C is operatively coupled to a working actuator circuit 238C. The working actuator circuit 238C includes a lifting cylinder 238 and a tilting cylinder 235, and control logic for controlling their actuation. The control logic selectively allows actuation of the lifting cylinder or the tilting cylinder in response to operator input. In some machines, the working actuator circuit 238C also includes control logic for selectively supplying pressurized hydraulic fluid to an attached implement. The control logic of the power machinery 200 includes an open-type center 3-way spool valve arranged in series. The valve spool is arranged to prioritize the lifting cylinder, then the tilting cylinder, and then the pressurized fluid to the attached implement.

[0075] For illustrative purposes, the above description of the power machinery 100 and the loader 200 has been provided to offer an illustrative setting on which the examples discussed below can be practiced. While the examples discussed can be practiced on power machinery such as those typically manufactured by… Figure 1 The block diagram illustrates the power machinery 100, and more particularly on loaders such as rail-mounted loaders 200, but unless otherwise noted or described, the concepts discussed below are not intended to limit their application to the specific context 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) in a specific configuration of a loader 200. As shown in these figures, the loader 200 may include a front end 280, a rear end 282 opposite to the front end 280, a first lateral side 284 (e.g., left side), and a second lateral side 286 opposite to the first lateral side 284 (e.g., right side). In the illustrated example, a cab 250 and an operator's station 255 (see [reference needed]) are also present. Figure 7A and Figure 7B The cab / operator station is located at the front end 280 of the loader 200, and the power source 220 is located 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 may be located at the rear end of the loader, and the power source may be located at the front end, or between the front end and the rear end.

[0077] The air intake system 300 is configured to supply 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 filter elements (not individually numbered).

[0078] Air inlet 302 may include a protruding (or other) housing attached to the external panel 330 of the loader 200 (see [link]). Figure 7A Air inlet 302 is shown as a protruding, angled housing formed separately from the outer panel 330, but some air inlets may be integrally formed with the outer panel of the power machinery or may have other geometries.

[0079] A first air duct 306 can be connected between the air inlet and the enclosed compartment 312 of the loader frame 210. Therefore, duct 306 can 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 enclosed compartment 312 (e.g., at the top side of the enclosed compartment 312, such as...). Figure 6 (As shown in the diagram). A second air duct 308 can be connected between the enclosed chamber 312 and the filter enclosure 310. Thus, duct 306 can define a second (downstream) flow path through the second air duct 308 between the outlet of the enclosed chamber 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 the diagram). Figure 6 (As shown in the image).

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

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

[0082] Therefore, during operation, air entering the power source 220 is guided by various indicated structures to travel along an air intake path defined by the air inlet 302, the first air duct 306, the enclosed chamber 312, and the second air duct 308 before entering the filter enclosure 310. Air can then continue from the filter enclosure 310 through duct 314 (if included) to the power source 220.

[0083] Now for reference Figure 5C The enclosed compartment 312 of frame 210 is formed by the hollow frame member 313 of frame 210, allowing air passing through the air intake system to enter the enclosed compartment 312 from the first air duct 306 and exit the enclosed compartment 312 to the second air duct 308. Therefore, the enclosed compartment 312 of frame 210 provides a conduit for airflow between air inlet 302 and power source 220. In the illustrated example, frame member 313 forms a vertical extension structure configured to support lifting arm structure 230 (see...). Figure 2 This is for pivoting movement relative to the power machinery frame 210. Specifically, the enclosed compartment 312 may intersect with a joint 216C configured to provide a pivot point for the linkage arm of the lifting boom structure 230, or the frame member 313 may otherwise include said joint. In some cases, this combined use of the compartment 312 (including the surrounding structure) can provide particularly significant encapsulation efficiency.

[0084] The enclosed compartment 312 may be configured 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, configured to receive airflow from a first air duct 306 also connected to the first side 316. Similarly, a second opening is included on the second side 318, configured to provide airflow from the enclosed compartment 312 to a second air duct 308 also connected to the second side 318.

[0085] A closed chamber typically includes sufficient boundary structures such that substantially all (e.g., 95% or more) of the air that flows into the chamber via the intake flow path also flows out of the chamber via the intake flow path. In the illustrated example, in addition to the inlet and outlet openings for the air intake flow path, there are additional openings (e.g., such as...). Figure 5C(Seen near pipe 308). However, during the assembly of the power machinery, those openings can be covered using rubber gaskets, foam seals, or other sealing devices, thus isolating the enclosed compartment 312 from the engine compartment 322, which is also defined by the frame 210 to house the power source 220. With this properly configured seal, hot and dirty air from the engine compartment 322 is generally prevented from entering the enclosed compartment 312 within the frame 210.

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

[0087] As discussed herein, a first compartment is considered isolated from another compartment if it is mechanically sealed to prevent airflow to a second compartment. For example, the seals, structural welds, and interfaces of the stacked structure of compartments can isolate one compartment from another by substantially inhibiting airflow from leaving the compartment into the other, compared to operating airflow through operating airflow openings (i.e., openings designed in the bulkhead for flow along the operating airflow path). In other words, for some examples, the structural form of the compartment and the added interfaces (e.g., seals) can ensure that the operating airflow from the compartment through designated flow openings substantially exceeds other concurrent airflows from the compartment to another specific area (e.g., exceeding flow to the other compartment by 85%, 90%, 95%, 98%, 99%, etc.).

[0088] refer to Figure 6 The inlet 302 can be positioned generally in front of the power source 220 (e.g., in front of the midpoint of the crankshaft) to help provide adequately cooled and clean air. In the illustrated example, the inlet 302 is positioned entirely in front of the power source 220, but other locations are possible. For example, the power source 220 can be defined by the 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, the first air duct 306 can be advantageously positioned in front of the midpoint of the power source 220 relative to such a length.

[0089] Now for reference Figures 7A to 7CThe air intake 302 of the air intake system 300 can be arranged at the rear of the cab 250. In the illustrated example, the air intake 302 is arranged between the cab 250 and the cooling outlet 324, and specifically in front of the cooling outlet 324. The cooling outlet 324 is configured to allow hot air to escape from the engine compartment 322 after the air has passed through the radiator 322. Therefore, the air intake 302 arranged in front of the cooling outlet 324 allows the air intake 302 to receive relatively cool air (i.e., the air intake 302 is configured to draw in cooler ambient air, rather than hotter air exiting through the cooling outlet 324).

[0090] Air inlet 302 may include one or more openings to allow air to enter air intake system 300. In the illustrated example, specifically as shown... Figure 7B and Figure 7C As shown, the air inlet 302 is formed with a shroud including a first opening 326 disposed on the 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 the lateral side of the air inlet 302 facing a 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, a continuously larger opening may be provided toward the outer side of the air inlet 302 (e.g., at a greater distance from the outer side of the cooling outlet 324) because this can provide improved intake and internal airflow characteristics, including the intake of warmer air relative to the cooling outlet 324.

[0091] In the illustrated example, the shroud of air inlet 302 closes off the airflow on the rear side of air inlet 302 facing the rear end 282 of loader 200 (i.e., towards cooling outlet 324 and away from cab 250). This also helps to isolate air inlet 302 from hot air leaving cooling outlet 324. In the illustrated example, the shroud of air inlet 302 also closes off the airflow on the opposite lateral side of air inlet 302 facing the second lateral side 286 of loader 200 (i.e., the potential stagnant or vortex area facing cooling outlet 324). This arrangement can also result in improved quality of the airflow entering air inlet 302 (e.g., cooler temperature, cleaner composition).

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

[0093] In fact, in the illustrated example (from a side-view perspective), a generally vertical flow path extending over a considerable length is provided between the air inlet and the bottom portion of the frame compartment 312 (i.e., a portion of the substantially horizontal flow path from the frame air outlet that directs airflow to the first air duct 306, as shown). Furthermore, also partly due to the configuration of the frame compartment 312, the second air duct 308 can define a substantially horizontal flow path from the frame compartment over a relatively large distance (e.g., beyond most of the length of duct 308). For example, as... Figure 5B As illustrated in the diagram, 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, said flow path being aligned with the inlet of the filter assembly 304 along a vertical reference line 321. Therefore, the extension length of this substantially horizontal flow path can also allow for the inclusion of another substantially vertical flow path extending upwards to the filter assembly 304. Furthermore, as... Figure 5D and Figure 5E As illustrated in the diagram (from a top-down view), the flow path along the second air duct 308 defines the path for the operating airflow between the frame compartment 312 (e.g., from the compartment outlet opening) and the filter assembly 304, and the path is substantially parallel to the front and rear axes of the power machinery (e.g., centerline 320).

[0094] Although the currently disclosed technology has been described by way of preferred implementation, those skilled in the art will recognize that changes in form and detail may be made without departing from the scope of this discussion.

[0095] As used herein, unless otherwise limited or specified, “or” indicates a non-exclusive list of components or operations that may exist in any kind of combination, rather than an exclusive list of components that may exist only as substitutes for 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 an exclusive alternative only when preceded by an exclusive term such as “any,” “one of,” “only one of,” or “exactly one.” 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 its variations) and including “or” for different listed elements refers to an option of any one 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's; one or more B's; one or more C's; one or more A's and one or more B's; one or more B's and one or more C's; one or more A's and one or more C's; and one or more A's, one or more B's, and one or more C's. Similarly, a list preceded by “multiple” (and its variations) and including an “or” for different listed elements refers to options of multiple instances of any one or all of the listed elements. For example, the phrases “multiple A's, B, or C” and “two or more of A's, B, or C” indicate the following options: A and B; B and C; A and C; and A, B, and C.

[0096] As used herein, unless otherwise limited or specified, “substantially parallel” means a direction within ±12 degrees of the reference direction (e.g., within ±6 degrees or ±3 degrees), including endpoints. Correspondingly, “substantially vertical” means a direction substantially parallel to the vertical direction, as defined relative to a reference system (e.g., for powered machinery, as defined relative to a horizontal support surface on which the powered machinery is operatively located), and a similar derived meaning applies to “substantially horizontal.” For a non-linear path, if the straight line between the endpoints of the path is substantially parallel to the reference direction or the mean derivative of the path within a common reference frame (i.e., the mean local slope), then the path can be considered substantially parallel to the reference direction, since the reference direction is substantially parallel to the reference direction.

[0097] As used herein, unless otherwise limited or specified, “substantially perpendicular” means a direction within ±12 degrees (e.g., within ±6 degrees) perpendicular to the reference direction, including endpoints. For a non-linear path, a path may be considered substantially perpendicular to the reference direction if the straight line between the endpoints of the path is substantially perpendicular to the reference direction or the mean derivative of the path within a common reference frame (i.e., the mean local slope), since the reference direction is substantially perpendicular to the reference direction.

[0098] As used herein in the context of powered machinery, unless otherwise defined or limited, the term "lateral" means a direction that extends at least partially to the left or right of the front and rear reference lines defined by the powered machinery (e.g., Figure 5C The centerline 320). Therefore, for example, the lateral sidewalls of the cab of a powered machine can be the left or right side wall of the cab, relative to the reference frame of the operator, who is oriented within the cab or otherwise operatively engaged with controls at the operator's station in the cab. Similarly, the "centerline" of the powered machine (e.g., Figure 5C The centerline 320 (referring to the reference line extending in the longitudinal direction of the power machinery, approximately halfway between the opposite lateral sides of the outer spatial envelope of the power machinery) is also used herein, unless otherwise stated, the terms “about” and “approximately” mean plus or minus 5% of the number preceding each term.

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

[0100] Similarly, as used herein, unless otherwise defined or limited, the terms "internal" and "external" refer to the relative relationship (e.g., lateral distance) between the centerlines of one or more structures (e.g., substructures) and a reference structure (e.g., main structure), which extend in the front-rear direction or between a first and a second end of the reference structure. For example, an internal structure may be positioned closer to the centerline of the reference structure than an external structure. In this respect, the outer structure of a subassembly of a power machinery may also be an external structure. In contrast, the external structure of a subassembly may not necessarily be located outside the other parts of the subassembly relative to the centerline of the subassembly.

[0101] In some implementations, methods embodying various aspects of the disclosed technology may be used to utilize, manufacture, install, etc., the apparatus or system disclosed herein. Accordingly, any description herein of a particular feature, capability, or intended purpose of an apparatus or system is generally intended to include disclosures of methods for using such an apparatus for its intended purpose, otherwise realizing such capability, manufacturing related components of such an apparatus or system (or an apparatus or system as a whole), and installing disclosed (or otherwise known) components to support such purpose or capability. Similarly, unless otherwise indicated or limited, discussions herein of any methods for manufacturing or using a particular apparatus or system (including installing an apparatus or system) are intended to inherently include disclosures of the features utilized and capabilities realized by such apparatus or system as examples of the disclosed technology.

Claims

1. A power machine, comprising: The frame includes hollow frame members forming a closed frame compartment, the closed frame compartment having a compartment inlet opening, a compartment outlet opening, a closed flow path between the compartment inlet opening and the compartment outlet opening, and a joint; A lifting arm, which is movably fixed to the frame and supported at the joint of the enclosed frame compartment to pivot relative to the frame; An engine, which is supported by the frame and enclosed in an engine compartment separate from the enclosed frame compartment; as well as An air intake system for the engine, the air intake system comprising: An air inlet is connected to an external panel of the power machinery; Filter assembly, the filter assembly including filter enclosure and filter element; A first air duct, defining a first flow path between the air inlet and the cabin inlet opening, wherein, from a side-view perspective, the first flow path defines a substantially vertical path for airflow between the air inlet and the bottom end of the enclosed frame cabin; and A second air duct defines a second flow path between the cabin outlet opening and the filter enclosure. From a top view, the second flow path defines a path for airflow between the cabin outlet opening and the filter assembly that is substantially parallel to the front and rear axes of the power machinery. The air intake system guides the intake airflow to the engine so that the intake airflow travels along an air intake path including the air inlet, the first flow path, the enclosed frame compartment, and the second flow path before entering the filter enclosure.

2. The power machinery according to claim 1, wherein, The power machinery includes a cooling outlet configured to exhaust air from the engine compartment; and The air inlet is arranged in front of the cooling outlet relative to the front-rear axis of the power machinery.

3. The power machinery according to claim 1 further includes: Operator cabin; The air inlet is arranged so that it is located behind the operator's cabin relative to the front-rear axis of the power machinery.

4. The power machinery according to claim 1, wherein, The air inlet is arranged in front of the engine relative to the front-rear axis of the power machinery.

5. The power machinery according to claim 4, wherein, The air inlet, the first flow path, and the enclosed frame compartment are arranged in front of the engine relative to the front and rear axis.

6. The power machinery according to claim 1, wherein, The air inlet includes a first inlet opening, which is disposed on a first side of the air inlet facing the front end of the power machinery.

7. The power machinery according to claim 6, wherein, The air inlet further includes a second inlet opening located on a second side of the air inlet facing the lateral side of the power machinery.

8. The power machinery according to claim 7, wherein, The first air duct extends from the inside of the air inlet, such that the second flow path extends in the direction from the air inlet to the outside of the cabin inlet opening.

9. The power machinery according to claim 1, wherein the cabin entrance opening is located on the top side of the enclosed frame cabin.

10. The power machinery according to claim 9, wherein the cabin outlet opening is located on the side of the enclosed frame cabin facing the rear end of the power machinery.

11. An air intake system for power machinery, comprising: An air inlet is connected to an external panel of the power machinery; Filter assembly, the filter assembly including filter enclosure and filter element; A first air duct is connected between the air inlet and the top of the enclosed frame compartment of the power machinery frame and extends downward between the air inlet and the top of the enclosed frame compartment of the power machinery frame, the enclosed frame compartment being supported on the frame and separate from the engine compartment, the engine compartment being defined by the frame and located behind the enclosed frame compartment. as well as A second air duct is connected between the side of the enclosed frame cabin and the filter enclosure and extends rearward between the side of the enclosed frame cabin and the filter enclosure. The air intake system directs airflow to the filter assembly such that the airflow travels along an air intake path sequentially including the air inlet, the first air duct, the enclosed frame chamber, and the second air duct before entering the filter enclosure, wherein the first air duct extends in a substantially vertical direction relative to the power machinery, and the second air duct extends in a substantially horizontal direction relative to the power machinery.

12. The air intake system according to claim 11, wherein, The air inlet includes a first opening, which is disposed on a first side of the air inlet facing the front end of the power machinery.

13. The air intake system according to claim 12, wherein, The air inlet further includes a second opening located on a second side of the air inlet facing the lateral side of the power machinery.

14. The air intake system of claim 11, wherein the side of the enclosed frame compartment faces the rear end of the power machinery.

15. The air intake system according to claim 14, wherein, From a side or standing perspective: The air intake path is defined as a substantially vertical first airflow path between the air inlet and the enclosed frame cabin; and / or The air intake path defines a second airflow path that is substantially horizontal between the enclosed frame compartment and the rearward portion, which is aligned along a vertical axis with the air inlet of the filter assembly.

16. A method for supplying air to an engine of power machinery, the method comprising: Air is drawn into an air inlet located on the exterior of the power machinery; The air is allowed to flow downward from the air inlet through a first air duct, which is connected between the air inlet and a hollow frame member of the power machinery frame. The air flows downward from the first air duct through the enclosed frame chamber of the hollow frame member; and The air is directed to flow from the enclosed frame compartment through a second air duct connected between the enclosed frame compartment and the engine compartment, the engine compartment supporting the engine at the rear end of the power machinery aligned with the engine's filter assembly, such that the air flows toward the rear end of the power machinery and away from the operator's station of the power machinery. Relative to the side-view or standing-view perspective, the air flows from the air inlet to the hollow frame member along a substantially vertical flow path; and The air flows from the hollow frame member toward the engine along a substantially horizontal flow path relative to the side-view or standing-view perspective.

17. The air intake system of claim 11, wherein the enclosed frame compartment includes a joint for supporting the lifting arm of the power machinery.

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