Sprayer having an electric motor drive

Abstract

A sprayer includes an electric motor that powers reciprocating pumping by a pump. A drive converts rotational output from the electric motor to linear input provided to the pump to cause pumping by the pump. A coupler connects a linear displacer of the drive with a fluid displacer of the pump. The coupler interfaces with one or more supports to prevent rotation of the coupler, and thus of the linear displacer, thereby restricting the linear displacer to linear movement.

Description

[0001] SPRAYER HAVING AN ELECTRIC MOTOR DRIVE

[0002] CROSS-REFERENCE TO RELATED APPLICATION(S)

[0003] This application claims priority to U.S. Provisional Application No. 63 / 622,838 filed January 19, 2024 and entitled “SPRAYER HAVING AN ELECTRIC MOTOR DRIVE,” and claims priority to U.S. Provisional Application No. 63 / 559,616 filed February 29, 2024 and entitled “SPRAYER HAVING AN ELECTRIC MOTOR DRIVE,” the disclosures of which are hereby incorporated by reference in their entireties.

[0004] BACKGROUND

[0005] This disclosure relates to material dispensing systems. More particularly, this disclosure relates to sprayers for spraying fluid material.

[0006] Sprayers can be used to spray a variety of fluids. The sprayers include a motor that powers a fluid displacer of a pump to cause pumping by the pump. A spray fluid, such as paint, is put under pressure by a pump for application to a substrate. Typically, the fluid is placed under pressure by a positive displacement pump. The pump places the fluid under pressure and outputs the fluid under pressure through a flexible hose. A spray gun is used to dispense the fluid, the gun being attached to the end of the hose opposite the pump. The positive displacement pump is typically mounted to a drive housing and driven by a motor. A pump rod is attached to a reciprocating drive that drives reciprocation of the pump rod, thereby pulling fluid from a container into the pump and then driving the fluid downstream from the pump. In some cases, electric motors can power the pump. The motor is attached to the pump via a gear reduction system that increases the torque and reduces the speed output by the motor.

[0007] SUMMARY

[0008] According to an aspect of the disclosure, a pumping assembly for pumping a fluid includes an assembly frame; an electric motor supported by the assembly frame, the electric motor comprising a rotor and a stator; a pump supported by the assembly frame, the pump comprising a piston; a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston; and a coupler interfacing with the drive and the assembly frame, the coupler restricting a linear displacer of the drive to linear displacement along a reciprocation path.

[0009] According to an additional or alternative aspect of the disclosure, a pumping assembly for pumping a fluid includes an assembly frame including a mounting frame, a motor mounting, and a plurality of vertical supports extending between the mounting frame and the motor mounting; an electric motor supported by the motor mounting, the electric motor comprising a rotor and a stator; a pump supported by the assembly frame and mounted to the mounting frame, the pump comprising a piston; a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston; and a coupler interfacing with the drive and a first subset of the plurality of vertical supports, the coupler configured to ride along the first subset of the plurality of vertical supports to guide a linear displacer of the drive along a reciprocation path.

[0010] According to another additional or alternative aspect of the disclosure, a pumping assembly pumping assembly for pumping a fluid includes an assembly frame; an electric motor supported by a motor mounting of the assembly frame, the electric motor comprising a rotor and a stator; a pump supported by the assembly frame and mounted to a mounting frame of the assembly frame, the pump comprising a piston; a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston, the drive comprising a nut connected to the rotor and a screw extending through the nut; and a coupler interfacing with the screw and a plurality of guide rods that extend between the mounting frame and the motor mounting, the plurality of guide rods interfacing with the coupler to prevent rotation of the coupler, the coupler configured to ride along the plurality of guide rods to guide linear displacement of the screw along a reciprocation path.

[0011] According to yet another additional or alternative aspect of the disclosure, a pumping assembly for pumping a fluid includes an assembly frame; an electric motor supported by the assembly frame, the electric motor comprising a rotor and a stator, the rotor disposed radially inward of the stator and the rotor defining an interior space within a rotor tube of the rotor; a pump supported by the assembly frame, the pump comprising a piston; and a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston. The drive includes a nut connected to the rotor to rotate with the rotor; and a screw interfacing with the nut and configured to be linearly displaced relative to the nut by rotation of the nut. The nut is mounted to the rotor such that a body of the nut is partially disposed within the interior space and partially disposed outside of the rotor tube.

[0012] According to yet another additional or alternative aspect of the disclosure, a pumping assembly for pumping a fluid includes an assembly frame; an electric motor supported by the assembly frame, the electric motor comprising a rotor and a stator, the rotor disposed radially inward of the stator and the rotor defining an interior space within a rotor tube of the rotor; a pump supported by the assembly frame, the pump comprising a piston; and a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston. The drive includes a nut connected to the rotor to rotate with the rotor; and a screw interfacing with the nut and configured to be linearly displaced relative to the nut by rotation of the nut. The drive is connected to the electric motor as a single unit such that the nut and the screw are mountable to the electric motor together and are dismountable from the electric motor together.

[0013] According to yet another additional or alternative aspect of the disclosure, a method of servicing a pumping assembly having an electric motor configured to generate a rotational output and a drive configured to convert the rotational output to a linear input for driving a pump. The method including dismounting a guide rod of an assembly frame such that the guide rod is withdrawn from a guide aperture through a guide plate of a coupler; disconnecting the guide plate from a linear displacer of the drive; disconnecting the drive from a rotor of the electric motor; and shifting the drive in a first axial direction along a rotational axis of the electric motor and away from the electric motor such that the drive passes within a pump slot formed in the assembly frame, wherein a pump body of the pump is disposed in the pump slot with the pump mounted to the assembly frame.

[0014] According to yet another additional or alternative aspect of the disclosure, a wiper assembly includes a housing disposed about an axis; a holder disposed within the housing, the holder having a first mount groove disposed on an inner side of the holder, the first mount groove extending circumferentially and axially relative to the axis; and a first wiper disposed in the first mount groove.

[0015] BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 A is an isometric view of a sprayer.

[0017] FIG. IB is an enlarged isometric view of a portion of the sprayer.

[0018] FIG. 2 is a cross-sectional view of a pumping assembly of a sprayer taken along line 2-2 in FIG. 1A.

[0019] FIG. 3 is an exploded view of a pumping assembly.

[0020] FIG. 4 is isometric view of a portion of a spray system with the pump removed.

[0021] FIG. 5 is a cross-sectional view of another pumping assembly.

[0022] FIG. 6 is a cross-sectional view showing a portion of a pumping assembly.

[0023] FIG. 7 is a cross-sectional view of a drive.

[0024] FIG. 8A is a first exploded view of a wiper assembly. FIG. 8B is a second exploded view of the wiper assembly.

[0025] DETAILED DESCRIPTION

[0026] According to aspects of the disclosure, a sprayer can be used to spray a variety of fluids. Paint will be used herein as the main example of a type of fluid that can be sprayed, but it will be understood that the teachings of the present disclosure can relate to spraying of other types of fluids, such as other coatings, protective layers, lacquers, stains, finishes, textures, adhesives, and treatments, amongst other options. The sprayer includes a pump that is powered to pump by an electric motor. The pump includes a fluid displacer, such as a piston, that is caused to reciprocate by the electric motor. The motor and the fluid displacer can be disposed coaxially. In some cases, a drive configured to convert rotational output from the motor into linear input to the fluid displacer is connected to the motor and the fluid displacer. In some examples, the drive can be mounted to and / or removed from the motor as a single unit.

[0027] A sprayer includes a coupler that prevents rotation of a portion of the drive such that linear motion is provided to the fluid displacer. The fluid displacer can mount to the coupler such that the coupler provides the driving input to the fluid displacer from the drive.

[0028] A drive converts rotational motion output by an electric motor to linear motion input to a piston of a pump to displace the piston and cause pumping by the pump. The drive is mountable to a rotor of the motor to receive the rotational output. The drive can be mounted to and dismounted from the motor by shifting of the drive axially along a rotational axis of the rotor. The drive is mountable as a single unit such that both the rotator and linear displacer of the drive mount and dismount together. The drive is mountable and dismountable from the motor while the motor remains mounted on and supported by an assembly frame of a pumping assembly.

[0029] Components can be considered to radially overlap when those components are disposed at common axial locations along an axis. A radial line extending from the axis will extend through each of the radially overlapping components. Components can be considered to axially overlap when those components are disposed at common radial and circumferential locations relative to an axis such that an axial line parallel to the axis extends through the axially overlapping components. Components can be considered to circumferentially overlap when aligned about an axis, such that a circle centered on the axis passes through the circumferentially overlapping components.

[0030] FIG. 1A is an isometric view of sprayer 10. FIG. IB is an enlarged partial isometric view of sprayer 10. FIG. 2 is a cross-sectional view of pumping assembly 12 taken along line 2-2 in FIG. 1A. FIGS. 1A-2 are discussed together. Sprayer 10 includes pumping assembly 12, sprayer frame 14, spray gun 16, and supply line 18. Pumping assembly 12 includes assembly frame 20, motor 28, drive 30, coupler 32, and pump 34. Rotator 36 and linear displacer 38 of drive 30 are shown. Pump mounting 22, motor mounting 24, and vertical supports 26 of assembly frame 20 are shown. Pump body 40, piston 42, pump inlet 44, and pump outlet 46 of pump 34 are shown.

[0031] In some examples, the pump axis on which piston 42 reciprocates, is disposed coaxially with the motor axis which is a rotational axis of the motor 28, with the pump 34 mounted. As such, pump 34 and motor 28 can, in some examples, be disposed coaxially. FIG. 2 shows a common axis CA which extends along both the pump axis and the motor axis and is coaxial with both the pump axis and the motor axis. The common axis CA is vertical. Reference herein to vertical refers to along or otherwise parallel with the common axis CA. Radial refers to a direction or plane that is orthogonal to the common axis CA. Upper, lower, above, and below, and other such designations, refer to heights or relationships along the common axis CA. Inner, inward, outward, or outer refer to radial positions or directions relative to the common axis CA.

[0032] Sprayer 10 is configured to generate a pressurized flow of fluid and output a spray of the fluid. Sprayer 10 includes sprayer frame 14 that supports other components of sprayer 10. Sprayer frame 14 includes a plurality of wheels (a pair of wheels), legs (a pair of legs), and a handle, however various other embodiments can exclude any one or more of these frame components and / or incorporate other frame components. In various examples, the sprayer 10 is supported by two wheels contacting the ground and two legs also contacting the ground. The sprayer 10 can be tipped onto the wheels, with the legs elevating away from the ground, for transport by hand.

[0033] Pumping assembly 12 is supported by sprayer frame 14. In the example shown, the pumping assembly 12 is mounted to sprayer frame 14. It is understood that pumping assembly 12 can be mounted to other frames and structure to pump fluid. The wheels and handle of sprayer 10 are connected to or formed by portions of the sprayer frame 14 in the example shown.

[0034] Assembly frame 20 supports components of pumping assembly 12. Assembly frame 20 can be connected, directly or indirectly, to sprayer frame 14 such that pumping assembly 12 is supported by sprayer frame 14. Assembly frame 20 supports pump 34 and motor 28. Assembly frame 20 is configured such that pump 34 is removably mountable to assembly frame 20. In the example shown, assembly frame 20 includes pump mounting 22 that is configured to support pump 34. Pump mounting 22 can be formed as a plate, among other options. Pump mounting 22 can be connected to sprayer frame 14 to connect pumping assembly 12 to sprayer frame 14. For example, pump mounting 22 can be connected to sprayer frame 14 by fasteners, such as threaded bolts among other options.

[0035] Pump 34 is supported by sprayer frame 14 of sprayer 10. In the example shown, pump 34 is configured to mount to pump mounting 22 to be supported by assembly frame 20. Pump 34 is a reciprocating type of pump. In various examples the pump 34 is a pistontype pump; it is understood, however, that other reciprocating type pumps are possible, such as diaphragm pumps. Such reciprocation can be linear reciprocation along a pump axis. The reciprocation can be along a reciprocation path. The reciprocation can be along a vertical reciprocation path in various examples. Pump body 40 can support and / or enclose other components of pump 34.

[0036] Pump inlet 44 is configured to admit fluid into pump 34. Pump outlet 46 is configured to output fluid from the pump 34. Pump inlet 44 is disposed at a lower end of pump 34 in the example shown. Pump 34 is disposed vertically when mounted. The vertical orientation of the pump 34 and the ability to tip the sprayer 10 on to the wheels allows the pump inlet 44 to be immersed in a reservoir of paint, such as in a bucket, to directly suck paint without a hose. In this way, the pump 34 is an immersion pump.

[0037] Piston 42 is at least partially disposed within pump body 40. Piston 42 extends out of pump body 40 and is connected to drive 30 to receive a linear input from drive 30. Piston 42 is configured to reciprocate on a pump axis. Piston 42 reciprocates within pump body 40 to pump the spray fluid. In the example shown, the piston 42 is a double displacement type including at least one piston valve 48 carried in the piston 42 such that the pump 34 outputs fluid on the upstroke and the downstroke. An inlet valve 50 is also included below the piston 42. While the piston 42 reciprocates, seals 52 dynamically move relative to the pump body 40 or the piston 42 while sealing spray fluid from leaking.

[0038] Head 54 is disposed at one axial end of piston 42. Head 54 is disposed outside of pump body 40 in the example shown. Head 54 is configured to interface with coupler 32 to form a dynamic interface connection that drives reciprocation of piston 42. In the example shown, piston 42 is shown as one rod. It is understood that, in various other examples, the piston 42 can be formed by one or more separate components, such as having a piston rod that is formed separately from one or both of the head 54 that interfaces with coupler 32 and the seal supporting head of the piston 42 which reciprocates in the pump body 40. Such multiple components of the piston 42 can fixed relative to each other such that they stay fixed relative to each other during reciprocation.

[0039] The pump 34 includes pump outlet 46 that is configured to output fluid from the pump 34. Pump outlet 46 is formed through a side of pump body 40 in the example shown. Pump outlet 46 can be considered to be oriented radially relative to pump axis on which the piston 42 is configured to reciprocate.

[0040] Supply line 18 is attached to pump outlet 46 such that spray fluid pumped by the pump 34 is routed through the supply line 18. In various examples, spray gun 16 can be connected to the supply line 18 to receive the spray fluid from the supply line 18. It is understood that multiple hose segments can be linked together to form the supply line 18. The spray gun 16 includes a valve 17 which can be opened upon actuation of a trigger 19 of the spray gun 16 to spray fluid pumped by the pump 34, and the trigger 19 can be released to close the valve 17 to cease spraying of the fluid. The valve 17 can be mechanical and / or electric.

[0041] Electric motor 28 is supported by assembly frame 20. Electric motor 28 is configured to generate a rotational output to cause pumping by pump 34. Electric motor 28 can be a rotor stator type motor. The electric motor 28 can be a brushed or brushless type motor. The electric motor 28 can intake electrical energy and can output rotational motion.

[0042] The electric motor 28 includes rotor 58 and stator 60. The rotor 58 and stator 60 are disposed at least partially within motor housing 57. Motor 28 is mounted on and supported by motor mounting 24. Motor mounting 24 forms a portion of motor housing 57.

[0043] Stator 60 includes a plurality of coils 62 through which alternating current can be routed which generate electric magnetic fields. The electromagnetic fields interact with magnets 64 of the rotor 58 which cause the rotor 58 to rotate about the motor axis, relative to the stator 60. The magnets 64 can be supported by a rotor body of the rotor 58.

[0044] A rotor body of the rotor 58 supports the magnets 64. In the example shown, the rotor 58 includes a rotor tube 66 that forms a rotor body of the rotor 58. The rotor tube 66 rotates with the rest of the rotor 58. The rotor tube 66 can be a single metal piece, however not all examples are so limited. The rotor tube 66 defines an interior space 68. The interior space 68 can be coaxial with the motor axis. The interior space 68 can be cylindrical. The interior space 68 can be at least partially disposed within the motor 28. The interior space 68 can be disposed such that at least a portion, up to all, of the interior space 68 radially overlaps with electromagnetic components (e.g., coils 62, magnets 64, etc.) of the motor 28. The interior space 68 can be disposed such that at least a portion, up to all, of the interior space 68 radially overlaps with magnets 64 of the rotor 58. The interior space 68 can be disposed such that at least a portion, up to all, of the interior space 68 radially overlaps with one or multiple coils 62 of the stator 60.

[0045] Rotor 58 is rotatably supported too rotate on motor axis. In the example shown, rotor 58 is rotatably supported by upper bearing 70 and lower bearing 72. Each of the upper bearing 70 and lower bearing 72 can include inner / outer and / or upper / lower rings between which an annular array of rolling elements (e.g., balls, cylinders) rotate to allow relative rotation between the rings.

[0046] Electric motor 28 includes an upper bearing 70. The upper bearing 70 is located around the rotor tube 66 in the example shown. The upper bearing 70 can engage a motor housing 57 of the motor 28. The motor housing 57 can be one or more components that are coaxial with the axis and structurally support the stator 60, with the stator 60 being within the motor housing 57. The upper bearing 70 is directly radially between the rotor tube 66 radially inward of the upper bearing 70, and the motor housing 57 radially outward of the upper bearing 70.

[0047] Electric motor 28 includes a lower bearing 72. The lower bearing 72 is located around the rotor tube 66. The lower bearing 72 can engage the motor housing 57. In the example shown, the lower bearing 72 engages with the motor mounting 24 of the motor housing 57. The motor mounting 24 forms a lower end portion of the motor housing 57. The lower bearing 72 can surround, and engage, the rotor tube 66. The lower bearing 72 can be directly radially between the motor housing 57 radially outward from the lower bearing 72, and each of the rotor tube 66, the rotator 36, and the linear displacer 38 radially inward of the lower bearing 72.

[0048] Drive 30 is a reciprocating drive 30 that is connected to piston 42 to cause linear displacement of the piston 42 to cause pumping by pump 34. Drive 30 is connected to motor 28 and is configured to receive the rotational output from the motor 28. Drive 30 is configured to convert the rotational input from motor 28 to a linear motion that is provided to piston 42 to displace piston 42. It is understood that the drive 30 shown and descried is one design of a reciprocating drive, which demonstrates multiple independent aspects, but that other designs and variations of a reciprocating drive could instead be used within the scope of this disclosure, which may embody one or more of the same aspects. In the example shown, drive 30 is configured as a nut and screw, such as a ball screw or roller screw, through it is understood that drive 30 can take various forms suitable for converting rotational motion into linear motion. The reciprocating drive 30 converts the rotational motion output by the electric motor 28 into linear motion that is input to pump 34 for reciprocating the pumping element, such as the piston 42.

[0049] In the example shown, drive 30 includes rotator 36 and linear displacer 38. The rotator 36 is connected to the rotor 58 of motor 28 to receive the rotational output from motor 28. The rotator 36 can be connected to rotor 58 to rotate in a 1:1 relationship such that rotator 36 rotate one revolution for each revolution of rotor 58. The rotator 36 can be directly connected to rotor 58, such as directly connected to rotor tube 66, among other options. The rotator 36 can be connected to the rotor tube 66 by fasteners, such as threaded fasteners (e.g., bolts), among other connection options. The rotator 36 can interface, and connect with, a bottom side of the rotor tube 66.

[0050] Linear displacer 38 is configured to displace along a linear axis. Rotation of the rotator 36 causes displacement of the linear displacer 38 along a reciprocation path, which can be along and coaxial with the common axis CA. In the example shown, the linear displacer 38 is configured to reciprocate to cause reciprocation of piston 42. For example, motor 28 can be configured to rotate in a first rotational direction to cause linear displacer 38 to displacer in a first axial direction ADI along the reciprocation axis and motor 28 can rotate in a second rotational direction opposite the first rotational direction to cause linear displacer 38 to displace in a second opposite axial direction AD2 along the reciprocation axis.

[0051] In the example shown, the rotator 36 is formed as a nut and the linear displacer 38 is formed as a screw. The nut forming rotator 36 is rotated by the rotor 58 of the electric motor 28. In the examples shown, the rotator 36 rotates but does not reciprocate, and is accordingly held in a vertical position during pumping. The rotator 36 interfaces with the screw forming linear displacer 38. As further explained herein, the linear displacer 38 is prevented from rotating, and instead reciprocates, relative to the rotator 36. Such reciprocation can be vertical axial motion. Rolling elements are disposed between the rotator 36 and the linear displacer 38 and are configured to cause axial displacement of linear displacer 38 due to rotation of the rotator 36. The rolling elements can be formed as balls or elongate rollers, among other options.

[0052] In the example shown, rotator 36 extends upwards and into the interior space 68 of the rotor tube 66. As such, the interfacing of the linear displacer 38 and rotator 36, such as at the rolling elements (e.g., balls or elongate rollers) that interface directly with the rotator 36 and linear displacer 38, can occur within the interior space 68 of the rotor tube 66, such as directly radially inward of the rotor tube 66. In the example shown, a majority of the axial length of rotator 36 is disposed within rotor tube 66 to be radially overlapped by structure of rotor tube 66. Such a configuration can minimize the vertical height of the sprayer 10, providing a more compact sprayer 10 that is easier to maneuver and position during operation.

[0053] In the example shown, the rotator 36 is partially disposed within motor 28 and partially disposed outside of motor 28. Rotator 36 being partially disposed within motor 28 provides for a compact pumping assembly. Rotator 36 being partially disposed outside of motor 28 provides for easy access to drive 30, such as for mounting and dismounting, as discussed in more detail below. In various examples, the linear displacer 38 is configured to extend further into and out of the interior space 68 during reciprocation. The axial displacement of linear displacer 38 causes the length of the linear displacer 38 radially overlapping with rotor tube 66 to vary as linear displacer 38 moves. The interior space 68 allows the linear displacer 38 to back up into, and reciprocate within, the motor 28. The interior space 68 also allows airflow along the interface between the rotator 36 and the linear displacer 38, which can generate heat due to the frictional forces involved in converting rotational motion to reciprocating motion. The air can flow around the rotator 36. The air can flow around the linear displacer 38. In some cases, the air can flow between the linear displacer 38 and the rotator 36. The interior space 68 of the rotor tube 66 allows a channel of airflow to help cool the rotator 36 and the linear displacer 38.

[0054] Wiper assembly 39 interfaces with linear displacer 38. Wiper assembly 39 further interfaces with rotator 36. Wiper assembly 39 is configured to retain lubricant (e.g., grease) within drive 30. Wiper assembly 39 prevents leakage of the lubricant from within drive 30 to outside of drive 30. Wiper assembly 39 interfaces with both the linearly displacing linear displacer 38 and the rotating rotator 36. In the example shown, drive 30 includes a first wiper assembly 39 at a lower end of rotator 36 and a second wiper assembly 39 at an upper end of rotator 36.

[0055] Coupler 32 interfaces with linear displacer 38 and is configured to prevent linear displacer 38 from rotating with the rotator 36. Coupler 32 guides the linear displacer 38 along the reciprocation path. Coupler 32 limit linear displacer 38 to linear movement along the reciprocation path. In some examples, the linear displacer 38 is directly connected to the coupler 32; however, in various other examples, the linear displacer 38 can be indirectly connected to the coupler 32, such as by one or more intermediary components that force the coupler 32 and linear displacer 38 to move together. The pump 34 is connected to coupler 32 to receive a dynamic input from motor 28. The dynamic input drives displacement of piston 42 to cause pumping by pump 34. In the example shown, piston 42 interfaces with coupler 32 such that coupler 32 can displace piston 42 along the pump axis. The coupler 32 interfaces with piston 42 such that coupler 32 can displace piston 42 in either the first axial direction ADI along pump axis or the second axial direction AD2 along pump axis. The piston 42 can be directly connected to the coupler 32, though it is understood that in various other examples the piston 42 can be indirectly connected to the coupler 32, such as by one or more intermediary components that force the piston 42 to move together with the coupler 32.

[0056] As shown, the coupler 32 includes piston slot 74 which receives an enlarged head 54 of the piston 42. The piston slot 74 includes ridges 80 which hold a neck 56 of the piston 42, the head 54 being wider than an opening or slot through and between the ridges 80 through which the neck 56 extends. As such, the head 54 of the piston 42 is captured by the piston slot 74 of the coupler 32 and vertical motion of the coupler 32 forces the same vertical motion of the piston 42.

[0057] In the example shown, the piston slot 74 is formed in adaptor 82. Adaptor 82 is connected to linear displacer 38 and interfaces with guide plate 84 of coupler 32. Guide plate 84 forms a body of coupler 32 that is limited to axial displacement. Adaptor 82 interfaces with guide plate 84 such that adaptor 82 does not rotate relative to guide plate 84. While adaptor 82 and guide plate 84 are shown as separate components that assemble together, it is understood that not all examples are so limited. In various other examples, the guide plate 84 and adaptor 82 can be formed as a single component, such as monolithically, that is connected to linear displacer 38. In the example shown, adaptor 82 is disposed within coupler slot 78 formed in guide plate 84.

[0058] The coupler 32 prevents the linear displacer 38 from being rotated by the rotator 36 causing the linear displacer 38 to reciprocate vertically instead of rotating. The rotator 36 is configured to rotate with the rotor 58 but does not reciprocate with the piston 42. The coupler 32 prevents rotation of the linear displacer 38.

[0059] Vertical supports 26 extends between pump mounting 22 and motor mounting 24. Motor mounting 24 can form a portion of the motor housing 57. Vertical supports 26 can be formed as rods among other options. The vertical supports 26 can be tie rods. The vertical supports 26 can be cylindrical. The vertical supports 26 are orientated vertically. The vertical supports 26 can be oriented parallel to the pump axis with pump 34 mounted to sprayer frame 14. The vertical supports 26 can be oriented parallel to the motor axis. The plurality of vertical supports 26 can engage their lower ends with pump mounting 22. The plurality of vertical supports 26 can engage their upper ends with motor mounting 24. The plurality of vertical supports 26 can, in some examples, form a cage around the linear displacer 38 by being on all sides (forward, rearward, left, and right) of the linear displacer.

[0060] In the example shown, the vertical supports 26 can be used for guiding the coupler 32 along a vertical reciprocation path. As shown, the vertical supports 26 extend through the coupler 32. As shown, the coupler 32 includes a plurality of guide apertures 86 (e.g., vertically oriented), through guide plate 84. The vertical supports 26 extend through the guide apertures 86 in guide plate 84 such that the vertical supports 26 project in both axial directions ADI, AD2 relative to the guide plate 84. The vertical supports 26 that extend through the coupler 32 are disposed on opposite lateral sides of the linear displacer 38 in the example shown.

[0061] In the example shown, the vertical supports 26 include support rods 88 and guide rods 90. The support rods 88 extend between pump mounting 22 and motor mounting 24 and structurally support the motor mounting 24 and thus motor 28. Guide rods 90 interface with coupler 32 to prevent rotation of coupler 32. Guide rods 90 interface with coupler 32 such that coupler 32 rides on guide rods 90 along the reciprocation path. In the example shown, the guide rods 90 extend through the coupler 32. The guide rods 90 do not meaningfully structurally support the motor mounting 24 in the example shown. In this way, removal of the guide rods 90 do not cause the motor mounting 24, and the electric motor 28 supported by the motor mounting 24, from falling or otherwise moving out of place. In the example shown, the multiple support rods 88 do not extend through the guide apertures 86 of the coupler 32 and do not interface with the coupler 32. It is understood, however, that in some examples the vertical supports 26 that extend through the coupler 32 can structurally support the motor 28. In such an example, the plurality of vertical supports 26 that extend through the coupler 32 can both guide the coupler 32 along a reciprocation path and structurally support the motor mounting 24 and thus the electric motor 28.

[0062] In the example shown, two guide rods 90 extend through the coupler 32. It is understood, however, that in various other examples only one guide rod 90 may extend through coupler 32. In various other examples, more than two guide rods 90 can extend through or otherwise interface with coupler 32.

[0063] The guide rods 90 can be disposed symmetrically about the linear displacer 38. The guide rods 90 can be disposed symmetrically about the drive 30. The guide rods 90 can be disposed symmetrically about the pump axis with the pump 34 mounted to the frame 14. The guide rods 90 can be disposed symmetrically about the reciprocation axis of the coupler 32. In the example shown, which includes two guide rods 90, the guide rods 90 can be disposed 180-degrees apart from each other. It is understood that the guide rods 90 can be symmetrically spaced arrayed about the reciprocation path regardless of whether there are two or more guide rods 90. Spacing the guide rods 90 symmetrically can balance the thrust loads and prevent side loading exerted on linear displacer 38, elongating operational life and providing for smoother reciprocation and pumping.

[0064] As shown, a plurality of vertical supports 26 do not interface with the coupler 32. In the example shown, the support rods 88 do not interface with coupler 32. Support rods 88 structurally support the motor mounting 24, and thus the motor 28, without guiding the coupler 32 along the reciprocation path. The electric motor 28 can be entirely structurally supported directly by the plurality of support rods 88. For example, the electric motor 28 may not be directly supported by the sprayer frame 14. As such, motor 28 can remain supported and ready for operation even with coupler 32 dismounted or disconnected.

[0065] Coupler 32 is configured to ride along guide rods 90 during operation of sprayer 10. Bushings 96 are disposed within the guide apertures 86 of the coupler 32. The guide rods 90 extend through and interface with bushings 96. As such, the coupler 32 may interface with the guide rods 90 and be guided along the guide rods 90 by interfacing between the bushings 96 and the guide rods 90.

[0066] In the example shown, the guide rods 90 are removably connected to pump mounting 22 and motor mounting 24. Guide rods 90 can be directly connected to motor mounting 24, among other options. In the example shown, the guide rods 90 are connected to motor mounting 24 by a portion of the guide rod 90 extending into and connecting with a portion of the motor mounting 24. In the example shown, the guide rod 90 connects to motor mounting 24 at a threaded interface.

[0067] Guide rods 90 are also connected to pump mounting 22. In the example shown, the guide rods 90 are bolted through the pump mounting 22. Support fasteners 92 interface with guide rods 90 to connect guide rods 90 to pump mounting 22. The guide rods 90 can extend at least partially through rod apertures 94 within the pump mounting 22. The guide rods 90 extend into the pump mounting 22.

[0068] The guide rods 90 that guide the coupler 32 are orientated parallel, and offset, with the common axis CA. The common axis CA is coaxial with the piston 42. The piston 42 reciprocates along the common axis CA. The linear displacer 38 is coaxial with the common axis CA. The linear displacer 38 reciprocates along the common axis CA. The rotator 36 is coaxial with the common axis CA. The rotator 36 rotates on the common axis CA.

[0069] As shown, the pump 34 is mounted to and supported by the assembly frame 20. In the example shown, the pump 34 is mountable to and removable from the pump mounting 22 of the assembly frame 20. The pump mounting 22 can connect with the sprayer frame 14 such that the pumping assembly 12 is structurally supported by the sprayer frame 14. The pump mounting 22 can be a plate, among other options. Pump mounting 22 is configured to support pump 34 with pump 34 mounted to pumping assembly 12. Pump mounting 22 forms a portion of a static interface that structurally supports pump 34 while piston slot 74 forms a portion of a dynamic interface that causes pumping by pump 34.

[0070] The entirety of the pump 34 can be supported by the pump mounting 22. The pump 34 can hang from the pump mounting 22. The pump 34 may not be directly structurally supported by any other structure of the sprayer 10 other than the pump mounting 22. The pump 34 is secured to the pump mounting 22 by reception of part of the pump 34 within pump slot 76 of the pump mounting 22. In the example shown, a portion of pump body 40 is disposed within pump slot 76 to statically mount pump 34 to pump mounting 22.

[0071] In the example shown, pump 34 includes upper support 98 that interfaces with pump mounting 22. Upper support 98 can include one or more plates that interface with pump mounting 22. In some examples, upper support 98 is or includes a D-shaped plate, however various other options are possible. The upper support 98 fits in pump slot 76 of the pump mounting 22, and when received, the upper support 98 is too wide to move vertically relative out of the pump mounting 22. In some examples, upper support 98 is bracketed vertically by portions of pump mounting 22 such that upper support 98 is too wide to move vertically relative to pump mounting 22. Interfacing of the upper support 98 with the pump mounting 22 braces the pump 34 to prevent vertical motion of the pump body 40 of the pump 34 during reciprocation of the piston 42. The upper support 98 is fixed with respect to the pump body of the pump 34.

[0072] The pump 34 includes lower ring 100. The lower ring 100 is movable axially along the pump axis and relative to pump body 40. In some examples, the lower ring 100 can rotate on a threaded surface of the pump body 40. The lower ring 100 can be spun around the pump body 40 to move the lower ring 100 vertically relative to the pump body 40. In the example shown, downward motion of the lower ring 100 loosens the pump 34 to allow the upper support 98 to slide out from the pump slot 76 of the pump mounting 22, whereas upward motion of the lower ring 100 causes the lower ring 100 to engage the bottom of the pump mounting 22 to clamp the lower portion of the pump mounting 22 between the upper support 98 and the lower ring 100 to secure the pump 34 to the pump mounting 22.

[0073] During operation, motor 28 is provided with electrical driving power which causes the rotor 58 to rotate on the common axis CA. Rotation of the rotor 58 causes rotation of the rotator 36 of the drive 30. Rotation of the rotator 36 exerts axial force on the linear displacer 38. The coupler 32 engaging with the linear displacer 38 and with the guide rods 90 inhibits rotation of the coupler 32 which thereby inhibits rotation of the linear displacer 38, causing the linear displacer 38 to displace axially along the common axis CA. The piston 42 is displaced to cause pumping by pump 34.

[0074] Sprayer 10 provides significant advantages. Motor 28 and pump 34 can be disposed coaxially. Pump 34 can be mounted by shifting pump 34 laterally relative to motor 28 and towards motor axis and then into pump slot 76. Mounting pump 34 forms both static and dynamic connections for supporting and driving pump 34, respectively.

[0075] Coupler 32 interfaces with drive 30 and restrains portions of drive 30 from rotating on the axis. Coupler 32 limits linear displacer 38 to axial movement. Coupler 32 interfaces with vertical supports 26 such that coupler 32 can slide along the vertical supports 26 during axial displacement of piston 42. In the example shown, coupler 32 interfaces with guide rods 90 that do not structurally support the motor 28. As such, the guide rods 90 can be removed to provide access to coupler 32 and / or drive 30 for servicing and / or replacement while motor 28 remains structurally mounted and secured.

[0076] Drive 30 is disposed at least partially within motor 28 to radially overlap with components of motor 28 relative to motor axis. Rotator 36 extends into motor 28 such that rotator 36 radially overlaps with portions of rotor 58. Rotator 36 can radially overlap with portions of stator 60. Rotator 36 extending into motor 28 provides for a more vertically compact pumping assembly 12, allowing for easier maneuvering of sprayer 10 and allowing for use in tighter job site locations. Interior space 68 is disposed within rotor 58. Interior space 68 provides volume that accommodates portions of rotator 36 and portions of linear displacer 38. Interior space 68 allows linear displacer 38 to reciprocate within motor 28, providing for a compact configuration of sprayer 10.

[0077] FIG. 3A is an exploded view of pumping assembly 12 of sprayer 10. FIG. 3B is an enlarged view of detail B in FIG. 3A. FIG. 4 is an isometric view of a portion of sprayer 10 with pump 34 removed for clarity. FIGS. 3A-4 are discussed together. Assembly frame 20, motor 28, drive 30, pump mounting 22, motor mounting 24, pump 34, coupler 32, vertical supports 26, and bumpers 102 of pumping assembly 12 are shown. Motor housing 57 of motor 28 is shown. Rotator 36 and linear displacer 38 of drive 30 are shown. Pump body 40, piston 42, pump inlet 44, pump outlet 46, upper support 98, and lower ring 100 of pump 34 are shown. Guide plate 84, adaptor 82, and bushings 96 of coupler 32 are shown.

[0078] Pumping assembly 12 is configured to put a fluid under pressure and drive that fluid downstream to a downstream location, such as for spraying by a spray gun (e.g., spray gun 16). Motor 28 is an electric motor configured to receive electrical energy and output rotational motion. Drive 30 is connected to motor 28 and is configured to convert the rotational output from motor 28 into a linear input to pump 34 to drive displacement of piston 42.

[0079] Assembly frame 20 supports other components of pumping assembly 12. Vertical supports 26 extend between and are connected to motor mounting 24 and pump mounting 22. As discussed above, the vertical supports 26 include support rods 88 and guide rods 90 in this example, though other configurations are possible.

[0080] Support rods 88 extend vertically between and are connected to motor mounting 24 and pump mounting 22. Support rods 88 structurally support the motor mounting 24, and thus the motor 28, vertically above the pump mounting 22. Support rods 88 can directly connect to motor mounting 24 and / or the pump mounting 22. In the example shown, support rods 88 are directly connected to motor mounting 24 and are connected to pump mounting 22 by nuts that interface with threaded ends of the support rods 88.

[0081] Guide rods 90 extend vertically between and are connected to motor mounting 24 and pump mounting 22. Guide rods 90 do not structurally support the motor mounting 24 in the example shown. Instead, guide rods 90 interface with coupler 32 to limit coupler 32, and thus linear displacer 38, to axial displacement along common axis CA. Guide rods 90 are removably mountable to motor mounting 24. Guide rods 90 are connected to motor mounting 24 by interfaced threading in the example shown, though it is understood that other configurations are possible. Guide rods 90 can be disconnected from motor mounting 24 to facilitate removal of drive 30 for servicing and / or replacement.

[0082] Guide rods 90 are removably connected to pump mounting 22. Guide rods 90 are connected to pump mounting 22 by support fasteners 92. In the example shown, support fasteners 92 are threaded and connected with threading on guide rods 90. In the example shown, support fasteners 92 include exterior threading and extend into guide rods 90 to interface with interior threading within guide rods 90. It is understood, however, that other configurations are possible. For example, guide rods 90 can include exterior threading and support fasteners 92 can include interior threading to connect to guide rods 90. Rod apertures 94 are formed through pump mounting 22. Rod apertures 94 extend fully vertically through pump mounting 22 in the example shown. Guide rods 90 can be at least partially disposed within rod apertures 94. Guide rods 90 can be configured such that a full length of the guide rod 90 can pass through the rod aperture 94. In the example shown, a widest portion of each guide rod 90 is narrower than the narrowest portion of the rod aperture 94 such that the guide rod 90 can pass through the rod aperture 94 along an axis of the guide rod 90.

[0083] During assembly, guide rods 90 can be passed through rod apertures 94 in first axial direction ADI and connected to motor mounting 24. Support fasteners 92 are interfaced with guide rods 90 to connect guide rods 90 to pump mounting 22. During disassembly, support fasteners 92 are disconnected from guide rods 90 and guide rods 90 can be passed in second axial direction AD2 through rod apertures 94 to dismount guide rods 90.

[0084] Bumpers 102 are disposed at least partially around guide rods 90 in the example shown. Bumpers 102 are configured to soften impact at an end of travel. Bumpers 102 can prevent direct metal-to-metal contact between components of pumping assembly 12, such as between coupler 32 and pump mounting 22. It is understood that pumping assembly 12 can include bumpers 102 to limit travel in first axial direction ADI and / or in second axial direction AD2.

[0085] In the example shown, bumper 103 is disposed to limit travel in axial direction ADI. Bumper 103 is disposed in-line with drive 30 in the example shown. Bumper 103 is disposed in motor housing 57. Bumper plate 101 is mounted to linear displacer 38 to move with linear displacer 38. The bumper plate 101 is configured to contact bumper 103 in the event of overtravel in axial direction ADI.

[0086] Coupler 32 interfaces with guide rods 90 and is configured to travel along guide rods 90. In the example shown, coupler 32 includes guide plate 84 that rides along guide rods 90 and adaptor 82 that connects drive 30 to guide plate 84. In the example shown, adaptor 82 also connects with piston 42 to form the dynamic interface with pump 34. It is understood that, in some examples, coupler 32 can be formed as a single component that both rides along guide rods 90 and connects to drive 30 and piston 42.

[0087] Coupler 32 is connected to drive 30 and is configured to limit linear displacer 38 to linear movement along the common axis CA. Guide apertures 86 are formed through guide plate 84. Bushings 96 are disposed in guide apertures 86. Guide rods 90 extend fully through guide apertures 86 and interface with coupler 32 within guide apertures 86. In the example shown, guide plate 84 and guide rods 90 directly interface with bushings 96. Bushings 96 are configured to slide along guide rods 90 during axial movement of coupler 32.

[0088] Coupler slot 78 is formed in guide plate 84. Coupler slot 78 includes mount opening 104 that is open through a lateral side of guide plate 84. Coupler slot 78 is open through the front side of guide plate 84 in the example shown. Coupler slot 78 is open laterally and is open vertically both upwards towards motor 28 and downwards towards pump 34. Guide plate 84 includes plate ridges 106 that at least partially define coupler slot 78. Slot portion 108a is formed between plate ridges 106. Slot portion 108b is partially axially defined by plate ridges 106. Slot portion 108a is narrower than slot portion 108b in the example shown. A width W1 of slot portion 108a is less than a width W2 of slot portion 108b.

[0089] Coupler slot 78 is configured to receive adaptor 82. Adaptor 82 is configured to connect to guide plate 84 to be fixed relative to guide plate 84. Adaptor 82 is connected to guide plate 84 such that adaptor 82 and guide plate 84 are fixed together for simultaneous axial movement along the reciprocation path. In the example shown, adaptor 82 is connected to guide plate 84 by coupler fasteners 110, though it is understood that other connection types are possible. For example, the coupler slot 78 can be configured such that adaptor 82 is axially bracketed by material of guide plate 84 to axially lock adaptor 82 and guide plate 84 together. Coupler fasteners 110 further radially lock adaptor 82 to guide plate 84 to prevent sliding of adaptor 82 out of coupler slot 78.

[0090] Adaptor 82 is partially disposed in slot portion 108a and in slot portion 108b of coupler slot 78. Mount body 112 of adaptor 82 is disposed within slot portion 108b. Mount body 112 of adaptor 82 defines piston slot 74 that is configured to receive head 54 of piston 42. Projection 114 extends from mount body 112 and towards drive 30. Projection 114 extends from a top side of mount body 112 in the example shown. Projection 114 extends from mount body 112 and towards motor 28. Projection 114 extends into slot portion 108a. Projection 114 is configured to interface with plate ridges 106. Projection 114 interfaces with a lateral side face of the plate ridges 106. Projection 114 is non-circular and is configured to interface with the guide plate 84 within coupler slot 78 to prevent rotation of adaptor 82 relative to guide plate 84. In the example shown, projection 114 includes at least one flat side that interfaces with at least one flat side of guide plate 84, such as formed on plate ridges 106, to prevent relative rotation between adaptor 82 and guide plate 84. As such, adaptor 82 can be considered to connect with guide plate 84 at a keyed interface. Interfacing adaptor 82 with guide plate 84 at the keyed interface prevents torquing of coupler fasteners 110 that secure adaptor 82 to guide plate 84, which torquing could damage component of coupler 32.

[0091] Connector 116 is a portion of adaptor 82 that interfaces with drive 30 to connect coupler 32 to drive 30. Connector 116 extends from projection 114 and is configured to connect with linear displacer 38. In some examples, connector 116 is interfaced with linear displacer 38 at a threaded interface, though it is understood that other connection types are possible. In the example shown, connector 116 is configured to extend into linear displacer 38 to connect with linear displacer 38. It is understood, however, that in other examples the connector 116 can be formed as a bore in adaptor 82 that receives a portion of linear displacer 38.

[0092] Coupler fasteners 110 connect adaptor 82 to guide plate 84 in the example shown. Coupler fasteners 110 can be formed as threaded fasteners. In some examples, coupler fasteners 110 are configured to extend through mount body 112 and into guide plate 84. In some examples, coupler fasteners 110 can interface with threading within guide plate 84 to connect to guide plate 84. In other examples, coupler fasteners 110 can extend through guide plate 84 and threadedly connect to adaptor 82, among other connection options. Coupler fasteners 110 fix adaptor 82 and guide plate 84 together such that adaptor 82 and guide plate 84 move together along the reciprocation path. The coupler fasteners 110 also prevent the adaptor 82 from shifting within coupler slot 78. The coupler fasteners 110 fix adaptor 82 relative to guide plate 84 such that linear displacer 38 is locked for vertical movement relative to the vertically oriented guide rods 90.

[0093] Pump 34 is configured to mount at a static interface and a dynamic interface. The static interface is formed with assembly frame 20 and is configured to structurally support the pump 34. The dynamic interface provides driving input to piston 42 to cause displacement of piston 42. Pumping assembly 12 is configured such that the static and dynamic interfaces can be simultaneously formed and broken.

[0094] Pump 34 mounts to assembly frame 20 at the static interface. Pump 34 is at least partially disposed within pump slot 76 formed in pump mounting 22. In the example shown, a portion of pump mounting 22 is captured between lower ring 100 and upper support 98 to secure the static interface and fix the pump 34 to the pump mounting 22.

[0095] Pump 34 connects to motor 28 at the dynamic interface to receive a driving force from the motor 28. In the example shown, the pump 34 connects to motor 28 via coupler 32 and drive 30. Piston 42 is at least partially disposed in piston slot 74. As discussed above, the head 54 of piston 42 is retained within piston slot 74 by structure defining piston slot 74. Force can be exerted on piston head 54 in first axial direction ADI to displace piston 42 in first axial direction ADI. Force can be exerted on piston head 54 in second axial direction AD2 to displace piston 42 in second axial direction AD2. In the example shown, at least a portion of piston 42 extends into and is disposed within coupler 32. In the example shown, the piston 42 directly interfaces with adaptor 82.

[0096] The static and dynamic interfaces can be formed by lateral shifting of the pump 34 relative to the pump mounting 22 and coupler 32. The pump 34 can be shifted laterally in a first mount direction MD1 such that pump body 40 moves into pump slot 76 and piston 42 moves into piston slot 74 to mount pump 34. The pump 34 can be shifted laterally in a second mount direction MD2 opposite the first mount direction MD1 such that piston 42 is withdrawn from piston slot 74 and pump body 40 moves out of pump slot 76 to dismount pump 34.

[0097] In the example shown, each of pump slot 76, piston slot 74, and coupler slot 78 are open laterally. The pump slot 76, piston slot 74, and coupler slot 78 are open laterally in the same lateral direction. The pump slot 76, piston slot 74, and coupler slot 78 are open horizontally. The pump slot 76, piston slot 74, and coupler slot 78 are open radially outward relative to the common axis CA. The pump slot 76, piston slot 74, and coupler slot 78 are open axially along the common axis CA in both the first and second axial directions ADI, AD2. The pump slot 76, piston slot 74, and coupler slot 78 are each disposed coaxially on the common axis CA in the example shown. Each of the pump slot 76, piston slot 74, and coupler slot 78 being open in the same lateral direction facilitates mounting of pump 34 to form both the dynamic and static interfaces by lateral shifting. The coaxial configurations of the pump slot 76 on the reciprocation path of the drive 30 facilitates assembly of drive 30 with motor 28 and disassembly of drive 30 from motor 28 for servicing and / or replacement.

[0098] In the example shown, each of pump slot 76, piston slot 74, and coupler slot 78, are disposed coaxially such that the common axis CA passes through each of the pump slot 76, piston slot 74, and coupler slot 78. The pump slot 76, piston slot 74, and coupler slot 78 are all disposed coaxially with the motor axis MA with pump 34 mounted or dismounted. The coaxial arrangement of the various mounting slots (e.g., pump slot 76, piston slot 74, and coupler slot 78) facilitates quick and easy assembly and disassembly of various components of pumping assembly 12.

[0099] Drive 30 can be mounted to and dismounted from motor 28 without requiring dismounting of motor 28. Motor 28 can remain mounted and supported by assembly frame 20 while drive 30 is dismounted for servicing and / or replacement. Such a configuration provides for quick and easy assembly and disassembly, reducing downtime and providing for more efficient spray operations.

[0100] Drive 30 includes rotator 36 that is connected to rotor 58 of motor 28 to receive the rotational output from the motor. Rotator 36 includes drive body 118 which includes drive mount 120. Linear displacer 38 extends through drive body 118. Drive mount 120 projects outwards from drive body 118. Drive mount 120 is formed as a portion of drive body 118 in the example shown. For example, drive mount 120 and drive body 118 can be formed monolithically. It is understood that, in some examples, drive mount 120 can be formed separately from and connected to drive body 118. Drive mount 120 can be considered to form a mounting flange of the rotator 36.

[0101] Drive mount 120 extends radially outward relative to other portions of drive body 118 relative to an axis of reciprocation of the linear displacer 38. Drive mount 120 extends such that drive mount 120 is wider than the opening into interior space 68. Drive mount 120 projects to axially overlap with rotor tube 66. Drive mount 120 projects to axially overlap with an axial end face of rotor tube 66. Drive mount 120 being wider than interior space 68 locates drive 30 relative to motor 28 for desired displacement of linear displacer 38 and piston 42.

[0102] Drive mount 120 includes drive apertures 122 therethrough in the example shown. Drive body 118 is fixed to rotor 58 to connect drive 30 to motor 28. In the example shown, rotator 36 is connected to motor 28 by drive fasteners 126. In the example shown, the drive fasteners 126 extend through the drive mount 120 and into the rotor tube 66 of the rotor 58 to connect drive 30 to motor 28. For example, drive fasteners 126 can be threaded (e.g., bolts) that interface with threading of the rotor 58.

[0103] In the example shown, the rotor tube 66 of the rotor 58 includes a plurality of mount apertures 124 that are formed in an axial end face of the rotor tube 66. The mount apertures 124 are configured to receive the drive fasteners 126 that connect the drive 30 to the rotor 58. In the example shown, the mount apertures 124 are disposed in an annular array that extends about the motor axis MA. The annular array of mount apertures 124 facilitate mounting of rotator 36 to rotor 58 in various orientations about the motor axis MA. Such a configuration facilitates quick and efficient mounting of drive 30 to motor 28. The rotator 36 can be rotated a small angular amount about the motor axis MA to align the apertures through drive mount 120 with a set of the mount apertures 124. In the example shown, the rotor 58 includes more mount apertures 124 than the rotator 36 includes drive apertures 122. The count of the mount apertures 124 being greater than the count of the drive apertures 122 allows the drive apertures 122 to be aligned with different sets of the mount apertures 124 to mount to the rotor 58 in various orientations.

[0104] Vertical supports 26 support motor 28. Vertical supports 26 guide linear displacement of drive 30. As discussed above, the support rods 88 form a first subset of the vertical supports 26 that structurally support motor 28 and the guide rods 90 form a second subset of the vertical supports 26 that guide linear displacement. In the example shown, the array of support rods 88 are disposed further radially outward from the common axis CA than the array of guide rods 90. Such a configuration facilitates quick and efficient mounting and dismounting of drive 30 as guide plate 84 can pass between and support rods 88 and be maneuvered in the area surrounded by support rods 88.

[0105] In the example shown, the support rods 88 structurally support motor 28. The support rods 88 do not guide linear displacement or prevent rotation of linear displacer 38 in the example shown. Support rods 88 maintain connection with pump mounting 22 and motor mounting 24 during mounting and dismounting of drive 30. The support rods 88 do not interface with coupler 32 in the example shown. As such, motor 28 remains mounted and supported throughout mounting and dismounting of drive 30.

[0106] Guide rods 90 guide linear displacement of drive 30. The guide rods 90 do not structurally support motor 28. Guide rods 90 can be mounted and dismounted without affecting the support of motor 28. Motor 28 remains mounted and operational (e.g., able to generate a rotational output) with guide rods 90 installed and with guide rods 90 removed.

[0107] During dismounting of drive 30, the guide rods 90 are disconnected from pump mounting 22. For example, support fasteners 92 can be disconnected from guide rods 90 to disconnect guide rods 90 from pump mounting 22. The guide rods 90 can then be disconnected from motor mounting 24 and pulled in second axial direction AD2 and out through rod apertures 94 in pump mounting 22. For example, the guide rods 90 can be rotated to unthread the guide rods 90 from pump mounting 22 and then pulled out through rod apertures 94. With guide rods 90 removed, coupler 32 is not rotationally locked about the common axis CA.

[0108] Linear displacer 38 is disconnected from coupler 32. In the example shown, the coupler fasteners 110 are removed to disconnect the guide plate 84 and the adaptor 82. Removal of the coupler fasteners 110 breaks the connection between guide plate 84 and drive 30 that fixed guide plate 84 and drive 30 together for simultaneous axial displacement. With the connection between guide plate 84 and linear displacer 38 broken, the guide plate 84 can then be shifted relative to the adaptor 82 such that adaptor 82 is withdrawn from coupler slot 78. It is understood that, in various examples, the adaptor 82 can remain mounted on and connected to linear displacer 38 during mounting and dismounting of drive 30. It is understood that in various other examples, such as when guide plate 84 and adaptor 82 are monolithic, the entirety of coupler 32 can be disconnected from linear displacer 38. In some examples, adaptor 82 and guide plate 84 can be disconnected from linear displacer 38 as a single component, such as by breaking the connection between connector 116 and linear displacer 38.

[0109] With guide plate 84 dismounted, the rotator 36 is disconnected from rotor 58. In the example shown, the drive fasteners 126 are removed such that the drive body 118 is disconnected from the rotor tube 66. The drive 30 can then be shifted in second axial direction AD2 and axially away from motor 28 along the motor axis MA. The drive body 118 is withdrawn from motor 28 such that drive 30 is dismounted from motor 28.

[0110] In the example shown, the drive 30 can be fully withdrawn from motor 28 and dismounted from pumping assembly 12 by axial movement along the motor axis MA. In the example shown, the pump mounting 22 is configured such that drive 30 can pass axially through pump mounting 22. The drive 30 can pass axially through pump mounting 22 while portions of the drive 30 are radially bracketed by the structure of the pump mounting 22.

[0111] In the example shown, the drive 30 can pass through pump slot 76 along motor axis MA during mounting and / or dismounting. The adaptor 82, linear drive 30, and drive body 118 can pass into and through pump slot 76 along the motor axis MA. During dismounting, the adaptor 82, linear drive 30, and drive body 118 pass through pump slot 76 in second axial direction AD2. The drive mount 120 is configured such that drive mount 120 can pass axially through the pump slot 76 by axial movement alone. A radially outer edge of the drive mount 120 can be closer to the common axis CA than a radial edge of the pump slot 76 to allow the drive mount 120 to pass axially thorough the pump slot 76. The pump slot 76 can extend further radially from the common axis CA than the drive mount 120.

[0112] During assembly, the drive 30 is connected to rotor 58. Drive 30 can be passed axially in first axial direction ADI and along motor axis MA to position drive 30 for mounting. Drive 30 can be passed through pump slot 76 in first axial direction ADI. Drive body 118 enters into interior space 68 such that rotator 36 is at least partially disposed in motor 28. Drive body 118 extends into interior space 68. Drive 30 shifts in first axial direction ADI and drive mount 120 moves to abut rotor tube 66. Drive 30 can be rotated on the motor axis MA to align the drive apertures 122 through drive mount 120 with the mount apertures 124 formed in rotor 58. Drive fasteners 126 are passed through the drive mount 120 and into mount apertures 124 to connect rotator 36 to rotor 58. As noted above, the adaptor 82 can remain mounted to linear displacer 38 during mounting of drive 30 to motor 28.

[0113] Guide plate 84 is connected to linear displacer 38. In the example shown, the guide plate 84 is aligned with adaptor 82. Guide plate 84 can then be shifted radially relative to adaptor 82 such that adaptor 82 is received within coupler slot 78. Guide plate 84 is fixed to adaptor 82 to fix the guide plate 84 to linear displacer 38. In the example shown, coupler fasteners 110 are passed through adaptor 82 and into guide plate 84 to fix adaptor 82 and guide plate 84 together.

[0114] Guide rods 90 are passed through rod apertures 94 in pump mounting 22. The guide rods 90 are passed through the guide apertures 86 through the guide plate 84. The guide rods 90 are connected to motor mounting 24 and to pump mounting 22. Guide plate 84 is thereby restrained from rotating about the common axis CA. Pumping assembly 12 is thus ready to receive a pump 34 and cause pumping by the pump 34.

[0115] Linear displacer 38 and rotator 36 remain connected as a single unit during mounting and dismounting of drive 30. The linear displacer 38 does not need to be disassembled from rotator 36 during mounting and dismounting of drive 30. The entirety of drive 30, including both linear displacer 38 and rotator 36, is mountable and dismountable as the single unit. Mounting and dismounting drive 30 as a single unit simplifies assembly, maintenance, and disassembly of pumping assembly 12. Further, linear displacer 38 and rotator 36 remaining as a single unit maintains the roller interface between linear displacer 38 and rotator 36 such that the rolling elements do not need to be separately maintained, thereby reducing part count and further easing maintenance operations.

[0116] Pumping assembly 12 provides significant advantages. Drive 30 is restricted to linear movement by coupler 32. Vertical supports 26 structurally support the motor 28 and restrict rotation of the linear displacer 38 of the drive 30. Support rods 88 structurally support the motor 28. Guide rods 90 guide linear displacement of linear displacer 38. In examples in which the guide rods 90 do not structurally support the motor 28 the guide rods 90 can be removed to allow for servicing and / or replacement of guide rods 90, coupler 32, and / or drive 30. The drive 30 is mountable and dismountable while the motor 28 remains mounted and ready for operation.

[0117] Drive 30 is mountable to rotor 58 is a plurality of angular orientations about the motor axis MA. An array of mount apertures 124 are formed in the axial end face of rotor tube 66. The drive 30 is mountable to the rotor 58 by aligning the apertures through the body of drive 30 with the mount apertures 124. The array of mount apertures 124 facilitates quick and efficient mounting of drive 30.

[0118] Drive 30 can be mounted and dismounted by axial movement of drive 30 relative to motor 28 along motor axis MA. The drive body 118 of rotator 36 is at least partially disposed within motor 28. In the example shown, the drive body 118 is partially within motor 28 and partially outside of motor 28. The connection interface between rotator 36 and rotor 58 is on an exterior side of motor 28, allowing for easy access by the user and allowing drive 30 to be mounted and dismounting without disassembling components of motor 28. The drive 30 can pass through pump slot 76 during mounting or dismounting. Shifting drive axially during mounting and dismounting allows for drive body 118 to be disposed within motor 28, providing for a more compact configuration of pumping assembly 12 and sprayer 10. Mounting drive 30 by axial movement also allows for a narrower interior space 68 as the rotator 36 can be passed axially into the interior space 68 and does not require additional room for twisting or tilting of drive body 118 to position drive body 118 within motor 28. Such a configuration provides for a more compact motor 28, reducing costs and reducing the weight and size of pumping assembly 12.

[0119] In the example shown, the pump 34 is mountable and dismountable by lateral shifting of the pump 34 relative to assembly frame 20 and drive 30. The pump body 40 is mounted to pump mounting 22 at pump slot 76 and the piston 42 is connected to drive 30 at piston slot 74. While pump 34 shifts laterally during mounting of the pump 34, the drive 30 shifts axially during mounting of the drive 30. The pump 34 mounting and dismounting directions can, in some examples, be orthogonal to the drive 30 mounting and dismounting directions. Such a configuration can provide for more robust connections, providing for improved operating life and efficiency.

[0120] FIG. 5 is a cross-sectional view of pumping assembly 212. Pumping assembly 212 is substantially similar to pumping assembly 12 (best seen in FIGS. 2-3A), except that pumping assembly 212 includes coupler 232 that is formed as a single component. Components of coupler 232 similar to components of coupler 32 are indicated with the same reference number except increased by “200” (e.g., guide plate 84 (best seen in FIG. 3B) and guide plate 284).

[0121] In the example shown, piston slot 274 and connector 316 are formed monolithically with and as portions of guide plate 284. Guide plate 284 is directly connected to linear displacer 38. In the example shown, guide plate 284 is connected to linear displacer 38 by connector 316 interfacing with linear displacer 38. For example, connector 316 and linear displacer 38 can be connected together by interfaced threading, among other options. In the example shown, guide plate 284 directly interfaces with linear displacer 38 and guide rods 90. In the example shown, the guide plate 284 directly interfaces with piston 42 and guide rods 90. In the example shown, the guide plate 284 directly interfaces with each of piston 42, linear displacer 38, and guide rods 90.

[0122] Guide rods 90 can be withdrawn from guide plate 284 to rotationally unlock coupler 232. Coupler 232 can then be disconnected from linear displacer 38 to allow for removal of drive 30 from motor 28, such as for servicing and / or replacement.

[0123] FIG. 6 is a cross-sectional view showing a portion of pumping assembly 312. Pumping assembly 312 is substantively similar to pumping assembly 12 (best seen in FIGS. 2-3A) and pumping assembly 212 (FIG. 5), except that pumping assembly 312 includes a centrally located bumper. Components of pumping assembly 312 similar to components of pumping assembly 12 are labeled with the same reference number except increased by “300” (e.g., bumper 102 and bumper 402).

[0124] Bumper 402 extends around piston 42. Bumper 402 is mounted to pump cap 41 in the example shown. The pump cap 41 can form a portion of the pump body 40. The pump cap 41 can both support the bumper 402 and retain one or more dynamic seals within the pump body 40.

[0125] The piston 42 moves within bumper 402 but does not contact bumper 402. Bumper 402 can extend fully annularly around piston 42. Bumper 402 can be disposed coaxially with piston 42 on the common axis CA. Bumper 402 is aligned with coupler 32. In the example shown, bumper 402 is aligned with adaptor 82. Bumper 402 is configured to contact adaptor 82 to limit displacement in axial direction AD2 in the event of overtravel in axial direction AD2.

[0126] Pumping assembly 312 further includes guide rods 390 that are formed as single piece components. Each guide rod 390 is monolithically formed. The guide rods 390 are not connected with support fasteners 92 (FIGS. 2 and 3). Guide rods 390 are connected to motor mounting 24. Guide rods 390 extend through pump mounting 22 to connect with motor mounting 24. Guide rods 390 are not connected by threaded fasteners other than the threaded end of the guide rod 390 that connects to motor mounting 24.

[0127] FIG. 7 is a cross-sectional view of drive 30. FIG. 8A is a first exploded view of wiper assembly 39. FIG. 8B is a second exploded view of wiper assembly 39. FIGS. 7- 8B are discussed together. Linear displacer 38, rotator 36, and wiper assembly 39 of drive 30 are shown. Wiper assembly 39 includes assembly housing 510, washers 514, holder 516, and wipers 518.

[0128] Wiper assembly 39 is mounted to rotator 36 and can rotate with rotator 36. Wiper assembly 39 can rotate relative to the linear displacer 38 during operation. Assembly housing 510 is mounted to the body of rotator 36. Assembly housing 510 includes mount body 520 and cap 522. Mount body 520 is connected to the body of rotator 36, such as by fasteners (e.g., bolts). Cap 522 connects to mount body 520. Cap 522 can be connected to mount body 520 by interfaced threading, among other options. Washers 514, holder 516, and wipers 518 form a lubricant seal 512 of the wiper assembly 39. The lubricant seal 512 is captured between the mount body 520 and the cap 522. A passage extends fully axially through wiper assembly 39, such that linear displacer 38 can extend fully axially through the wiper assembly 39.

[0129] Lubricant seal 512 is disposed within a holding chamber 524. In the example shown, the holding chamber 524 is formed by mount body 520 and cap 522. Washers 514 are disposed on both axial ends of the wiper assembly 39. Washers 514 contact with the outer diameter of the holding chamber 524 and prevent lubricant leakage around the outer radial side of the lubricant seal 512. Washers 514 can further contact with the exterior of linear displacer 38, such as with the portions of linear displacer 38 between the threads on linear displacer 38. Washers 514 can be formed by felt. For example, washers 514 can be formed by die cutting felt sheets. Washers 514 can be pre-lubricated by soaking in a lubricant prior to assembly. Pre-lubricating the washers 514 prevents absorption of the lubricant in the drive 30 and provides improved life.

[0130] Holder 516 is disposed between the washers 514. Holder 516 is disposed axially between washers 514. Wipers 518 are supported by holder 516. Holder 516 includes mount grooves 526. Mount grooves 526 are formed on the inner radial side of holder 516. Mount grooves 526 extend partially circumferentially around the holder 516. Mount grooves 526 also extend axially as the mount grooves 526 extend circumferentially. In the example shown, the holder 516 includes multiple mount grooves 526. In the example shown, the multiple mount grooves 516 do not intersect each other. Mount grooves 526 can be considered to be helical grooves. Wipers 518 are disposed within mount grooves 526. In the example shown, lubricant seal 512 includes a pair of wipers 518 that are disposed in a pair of mount grooves 526. Each wiper 518 is disposed in its own mount groove 526. The wipers 518 can be disposed on opposite sides of the linear displacer 38. The wipers 518 can be disposed 180-degrees apart about the common axis CA.

[0131] Wipers 518 are configured to contact linear displacer 38 and provide a lubricant seal with the linear displacer 38. In the example shown, linear displacer 38 is formed as a screw. The wipers 518 are disposed within the threads of the screw. The wipers 518 are configured to ride in the threads during displacement of the screw. In the example shown, the wipers 518 rotate with rotator 36 relative to the linear displacer 38 while the linear displacer 38 is prevented from rotating.

[0132] Wipers 518 extend both axially and circumferentially to mate with the threads of the linear displacer 38. Wipers 518 can be considered to extend helically as each wiper 518 extends both axially and circumferentially. Wipers 518 are formed as curved cylinders, though it is understood that other configurations are possible. The wipers 518 are configured to maintain engagement with the threading of linear displacer 38 throughout operation. The wipers 518 ride in the valleys between the ridges of the threading. In the example shown, each wiper 518 extends partially, not fully, annularly about the linear displacer 38.

[0133] Wipers 518 are configured to contact the exterior of linear displacer 38 and prevent lubricant leakage along the linear displacer 38. Wipers 518 can be formed by felt. For example, each wiper 518 can be formed by felt cord. Wipers 518 can be pre-lubricated by soaking in a lubricant prior to assembly. Pre- lubricating the wipers 518 prevents absorption of the lubricant in the drive 30 and provides improved life.

[0134] Linear displacer 38 extends through wiper assembly 39. Linear displacer 38 extends fully axially though both wiper assemblies 39 of the drive 30. The wiper assemblies 39 provide lubricant sealing on both axial ends of the drive 30 and prevent lubricant leakage from drive 30.

[0135] During operation, linear displacer 38 moves axially along the axis CA and rotator 36 rotates to cause linear displacement of linear displacer 38. The rotator 36 is connected to rotor 58 and receives the rotational output from rotor 58. The wiper assemblies 39 are connected to rotator 36 to rotate with rotator 36. The linear displacer 38 is prevented from rotating and instead translates linearly. The wiper assembly 39 provides a static seal with rotator 36 as the wiper assembly 39 rotates with rotator 36. The wiper assembly 39 further provides a dynamic seal with linear displacer 38 that moves relative to wiper assembly 39.

[0136] Washers 514 engage with assembly housing 510 and prevent lubricant leakage about the radial exterior of lubricant seal 512. Washers 514 can extend radially inward to engage with an exterior of the linear displacer 38. Wipers 518 engage with linear displacer 38. Wipers 518 are configured to ride in the threading of the linear displacer 38 and prevent lubricant leakage along the linear displacer 38. The wipers 518 extend helically to mate with the lead of the threading of the linear displacer 38.

[0137] Wiper assembly 39 provides significant advantages. Wiper assembly 39 prevents lubricant leakage from drive 30. The wiper assembly 39 retains lubricant in the drive 30, improving the operating life of drive 30 and decreasing maintenance frequency. The wiper assembly 39 extends into the threading of the linear displacer 38. The wipers 518 ride in the threads of the linear displacer 38 and prevent lubricant leakage along such threading. The wipers 518 extending into the threading provides improved lubricant retention as compared to sealing along the exterior of linear displacer 38 between threads. Wipers 518 are configured to mate within the threads and extend helically to match with the lead of the threads. The wipers 518 rotate with the rotator 36 and are maintained in the threads as the linear displacer 38 moves axially. Holder 516 includes mount grooves 526 that maintain the orientation of the wipers 518 and maintain wipers 518 in the threads.

[0138] The wipers 518 and washers 514 can be formed from felt. The felt can be prelubricated and retains such lubricant, preventing absorption of lubricant from within drive 30 and providing improved sealing while reducing friction. The felt material can adapt to changes in gaps and prevents lubricant transmission past wiper assembly 39. The wipers 518 and washers 514 being formed from felt provides for quality sealing while reducing costs.

[0139] While the invention has been described with reference to an exemplary embodiment(s), it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment(s) disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

CLAIMS:

1. A pumping assembly for pumping a fluid, the pumping assembly comprising: an assembly frame; an electric motor supported by the assembly frame, the electric motor comprising a rotor and a stator; a pump supported by the assembly frame, the pump comprising a piston; a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston; and a coupler interfacing with the drive and the assembly frame, the coupler restricting a linear displacer of the drive to linear displacement along a reciprocation path.

2. The pumping assembly of claim 1, wherein the assembly frame supports the electric motor vertically above the drive, and the drive is disposed vertically above the pump.

3. The pumping assembly of any preceding claim, wherein a rotational axis of the electric motor is coaxial with a pump axis along which the piston of the pump reciprocates and with the reciprocation path of the linear displacer of the drive.

4. The pumping assembly of any preceding claim, wherein a pump body of the pump is configured to mount to the assembly frame at a static interface and the piston is configured to connect to the drive at a dynamic interface.

5. The pumping assembly of any preceding claim, wherein the assembly frame includes a mounting frame configured to interface with the pump to support the pump.

6. The pumping assembly of claim 5, wherein the mounting frame is a plate.

7. The pumping assembly of any one of claims 5 and 6, wherein the assembly frame further comprises a motor mounting of the electric motor and a plurality of vertical supports that extend between the mounting frame and the motor mounting.

8. The pumping assembly of claim 7, wherein the plurality of vertical supports are formed as a plurality of rods.

9. The sprayer of any one of claims 1-5, wherein the assembly frame includes: a plurality of vertical rods that extend between a mounting frame that supports the pump and a motor mounting that supports the electric motor.

10. The pumping assembly of claim 9, wherein the piston is connected to the coupler.

11. The pumping assembly of claim 10, wherein the piston attaches directly to the coupler.

12. The pumping assembly of any one of claims 10 and 11, wherein the coupler receives a head of the piston.

13. The pumping assembly of any one of claims 9-12, wherein the coupler is guided along the reciprocation path by at least one of the plurality of vertical supports during reciprocation of the piston of the pump while the at least one of the plurality of vertical supports remains stationary.

14. The pumping assembly of claim 13, wherein the reciprocation path is entirely along a vertical axis.

15. The pumping assembly of any one of claims 9-14, wherein at least one vertical support of the plurality of vertical supports extends through the coupler.

16. The pumping assembly of any one of claims 9-15, wherein at least two vertical supports of the plurality of vertical supports extend through the coupler.

17. The pumping assembly of any one of claims 9-16, wherein the coupler includes one or more bushings, wherein each bushing of the one or more bushings directly contacts one or more of the plurality of vertical supports.

18. The pumping assembly of any one of claims 9-17, wherein the linear displacer comprises a screw.

19. The pumping assembly of claim 18, wherein the screw is fixed with respect to the coupler such that the screw and the coupler reciprocate together.

20. The pumping assembly of claim 19, wherein the screw is directly connected to the coupler.

21. The pumping assembly of any one of claims 18-20, wherein the screw does not rotate during reciprocation of the piston.

22. The pumping assembly of any one of claims 18-21, wherein the screw is orientated parallel with the plurality of vertical supports.

23. The pumping assembly of any one of claims 18-22, wherein the drive includes a rotator that is configured to rotate during reciprocation of the piston.

24. The pumping assembly of claim 23 , wherein the rotator surrounds the screw.

25. The pumping assembly of claim 24, further comprising a plurality of rolling elements that interface between the screw and the rotator.

26. The pumping assembly of any one of claims 18-25 , wherein the screw backs up into the rotor of the electric motor during reciprocation of the piston.

27. The pumping assembly of any one of claims 9-26, wherein the coupler includes a guide plate that interfaces with multiple of the plurality of vertical supports and the coupler includes an adaptor connected to the linear displacer and removably connected to the guide plate.

28. The pumping assembly of claim 27, wherein the adaptor is connected to the guide plate by a plurality of coupler fasteners.

29. The pumping assembly of any one of claims 27 and 28, wherein the adaptor is keyed to the guide plate to prevent rotation of the adaptor relative to the guide plate.

30. The pumping assembly of any one of claims 27-29, wherein the guide plate includes a drive slot, the adaptor disposed within the guide slot.

31. The pumping assembly of claim 30, wherein the drive slot extends fully vertically through the guide plate and is open laterally.

32. The pumping assembly of any one of claims 27-31, wherein the guide plate includes a plurality of guide apertures extending fully through the guide plate, and wherein each of the multiple of the plurality of vertical supports extend through a guide aperture of the plurality of guide apertures.

33. The pumping assembly of any one of claims 9-32, wherein the plurality of vertical supports includes a first subset of supports and a second subset of supports, wherein the first subset of supports interface with the coupler and the second subset of supports do not interface with the coupler.

34. The pumping assembly of claim 33, wherein the first subset of supports do not structurally support the electric motor.

35. The pumping assembly of any one of claims 33 and 34, wherein the second subset of supports do structurally support the electric motor.

36. The pumping assembly of any preceding claim, when the rotor comprises a rotor tube that defines an interior space, the rotor tube rotating during reciprocation of the piston.

37. The pumping assembly of claim 36, wherein the linear displacer of the drive reciprocates within the interior space of the rotor tube during reciprocation of the piston.

38. The pumping assembly of any one of claims 36 and 37, wherein a nut of the drive extends into the interior space of the rotor tube, the nut rotating with the rotor but not reciprocating with the piston.

39. The pumping assembly of claim 38, further comprising a bearing that surrounds the rotor tube, the nut being located directly radially outward of the linear displacer and directly radially inward of both of the rotor tube and the bearing.

40. The pumping assembly of any preceding claim, wherein the pump is dismountable by disengagement of a lower ring of a pump mount of the pump from the assembly frame.

41. A sprayer comprisin : a sprayer frame; and the pumping assembly of any preceding claim mounted to the sprayer frame.

42. The sprayer of claim 41, further comprising: a spray gun fluidly connected to the pump to receive the fluid output by the pump.

43. The sprayer of any one of claims 41 and 42, wherein the sprayer frame includes a plurality of wheels.

44. A pumping assembly for pumping a fluid, the pumping assembly comprising: an assembly frame including a mounting frame, a motor mounting, and a plurality of vertical supports extending between the mounting frame and the motor mounting; an electric motor supported by the motor mounting, the electric motor comprising a rotor and a stator; a pump supported by the assembly frame and mounted to the mounting frame, the pump comprising a piston; a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston; and a coupler interfacing with the drive and a first subset of the plurality of vertical supports, the coupler configured to ride along the first subset of the plurality of vertical supports to guide a linear displacer of the drive along a reciprocation path.

45. The pumping assembly of claim 44, wherein: the first subset of the plurality of vertical supports includes a plurality of guide rods; anda second subset of the plurality of vertical supports includes a plurality of support rods, the plurality of support rods structurally supporting the electric motor.

46. The pumping assembly of claim 45, wherein the plurality of guide rods do not structurally support the electric motor.

47. The pumping assembly of any one of claims 45 and 46, wherein the coupler includes a guide plate, the guide plate having a plurality of guide apertures extending therethrough, wherein the plurality of guide rods extend through the plurality of guide apertures.

48. The pumping assembly of claim 47, further comprising: a plurality of bushings disposed in the plurality of guide apertures.

49. The pumping assembly of any one of claims 47 and 48, wherein the coupler includes an adaptor, the adaptor connected to the guide plate and the linear displacer.

50. The pumping assembly of claim 49, wherein the adaptor is connected to the guide plate by a plurality of coupler fasteners.

51. The pumping assembly of any one of claims 49 and 50, wherein the adaptor is at least partially disposed in a drive slot of the guide plate.

52. The pumping assembly of claim 51, wherein the drive slot is open vertically and laterally.

53. The pumping assembly of any one of claims 49-52, wherein a piston slot is formed in the adaptor, the piston slot configured to receive a head of the piston to connect the piston to the drive.

54. The pumping assembly of any one of claims 45-53, further comprising: at least one bumper disposed around each guide rod of the plurality of guide rods.

55. The pumping assembly of any one of claims 45-54, wherein the plurality of guide rods are evenly arrayed around the reciprocation path.

56. The pumping assembly of any one of claims 45-55, wherein the plurality of support rods are evenly arrayed around the reciprocation path.

57. A pumping assembly pumping assembly for pumping a fluid, the pumping assembly comprising: an assembly frame; an electric motor supported by a motor mounting of the assembly frame, the electric motor comprising a rotor and a stator;a pump supported by the assembly frame and mounted to a mounting frame of the assembly frame, the pump comprising a piston; a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston, the drive comprising a nut connected to the rotor and a screw extending through the nut; and a coupler interfacing with the screw and a plurality of guide rods that extend between the mounting frame and the motor mounting, the plurality of guide rods interfacing with the coupler to prevent rotation of the coupler, the coupler configured to ride along the plurality of guide rods to guide linear displacement of the screw along a reciprocation path.

58. The pumping assembly of claim 57, further comprising: a plurality of structural rods that extend between the mounting frame and the motor mounting, the plurality of structural rods structurally supporting the electric motor.

59. The pumping assembly of claim 58, wherein the plurality of structural rods do not interface with the coupler.

60. The pumping assembly of any one of claims 57-59, wherein the plurality of guide rods do not structurally support the electric motor.

61. The pumping assembly of any one of claims 57-60, wherein the plurality of guide rods are evenly arrayed about the reciprocation path.

62. A pumping assembly for pumping a fluid, the pumping assembly comprising: an assembly frame; an electric motor supported by the assembly frame, the electric motor comprising a rotor and a stator, the rotor disposed radially inward of the stator and the rotor defining an interior space within a rotor tube of the rotor; a pump supported by the assembly frame, the pump comprising a piston; and a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston, wherein the drive comprises:a nut connected to the rotor to rotate with the rotor; and a screw interfacing with the nut and configured to be linearly displaced relative to the nut by rotation of the nut; and wherein the nut is mounted to the rotor such that a body of the nut is partially disposed within the interior space and partially disposed outside of the rotor tube.

63. The pumping assembly of claim 62, wherein the screw moves within the interior space during reciprocation of the piston.

64. The pumping assembly of any one of claims 62 and 63, wherein the nut is mounted to the rotor tube by a plurality of drive fasteners.

65. The pumping assembly of claim 64, wherein the body of the nut includes a mounting flange having a plurality of drive apertures extending therethrough and the rotor tube includes a plurality of mount apertures, and wherein the plurality of drive fasteners extends through the plurality of drive apertures and into the plurality of mount apertures.

66. The pumping assembly of claim 65 , wherein the plurality of mount apertures are disposed in an annular array.

67. The pumping assembly of any one of claims 65 and 66, wherein a count of the mount apertures is greater than a count of the drive apertures.

68. The pumping assembly of any one of claims 62-67, wherein the pump mounts to the assembly frame within a pump slot of the assembly frame.

69. The pumping assembly of claim 68, wherein the drive is configured to pass through the pump slot along the rotational axis during mounting or dismounting of the drive on the electric motor.

70. The pumping assembly of any one of claims 62-69, further comprising: a coupler interfacing with the screw and the assembly frame, the coupler restricting the screw to linear displacement along a reciprocation path.

71. The pumping assembly of claim 70, wherein the coupler receives a head of the piston to connect to the piston.

72. The pumping assembly of any one of claims 70 and 71, wherein a plurality of guide rods of the assembly frame rotationally fix the coupler.

73. The pumping assembly of claim 72, wherein the plurality of guide rods pass through the coupler.

74. The pumping assembly of any one of claims 72 and 73, wherein the plurality of guide rods are connected to a motor mounting supporting the electric motor and a mounting frame supporting the pump.

75. The pumping assembly of any one of claims 72-74, wherein the plurality of guide rods do not structurally support the electric motor.

76. The pumping assembly of any one of claims 70-75, wherein the assembly frame includes a plurality of support rods that structurally support the motor, wherein none of the plurality of support rods pass through the coupler.

77. A pumping assembly for pumping a fluid, the pumping assembly comprising: an assembly frame; an electric motor supported by the assembly frame, the electric motor comprising a rotor and a stator, the rotor disposed radially inward of the stator and the rotor defining an interior space within a rotor tube of the rotor; a pump supported by the assembly frame, the pump comprising a piston; and a drive that receives rotational motion from the electric motor and translates the rotational motion to linear motion for displacing the piston, wherein the drive comprises: a nut connected to the rotor to rotate with the rotor; and a screw interfacing with the nut and configured to be linearly displaced relative to the nut by rotation of the nut; and wherein the drive is connected to the electric motor as a single unit such that the nut and the screw are mountable to the electric motor together and are dismountable from the electric motor together.

78. The pumping assembly of claim 77, wherein the nut is fixed to the rotor tube by a plurality of drive fasteners.

79. The pumping assembly of claim 78, wherein the plurality of drive fasteners are bolts.

80. The pumping assembly of any one of claims 78 and 79, wherein a portion of the nut interfacing with the drive fasteners is disposed outside of the rotor tube.

81. The pumping assembly of any one of claims 77-80, wherein the nut is at least partially disposed within the interior space.

82. The pumping assembly of claim 81, wherein a majority of an axial length of the nut is disposed within the interior space.

83. The pumping assembly of any one of claims 77-82, wherein the piston is configured to reciprocate along a pump axis, the rotor is configured to rotate on a rotational axis, and the pump axis and rotational axis are coaxial.

84. The pumping assembly of any one of claims 77-83, wherein a pump body of the pump is disposed within a pump slot of the assembly frame with the pump mounted to the assembly frame, wherein the drive is aligned with the pump slot.

85. The pumping assembly of claim 84, wherein the drive is configured to pass through the pump slot during mounting and dismounting of the drive.

86. A method of servicing a pumping assembly having an electric motor configured to generate a rotational output and a drive configured to convert the rotational output to a linear input for driving a pump, the method comprising: dismounting a guide rod of an assembly frame such that the guide rod is withdrawn from a guide aperture through a guide plate of a coupler; disconnecting the guide plate from a linear displacer of the drive; disconnecting the drive from a rotor of the electric motor; and shifting the drive in a first axial direction along a rotational axis of the electric motor and away from the electric motor such that the drive passes within a pump slot formed in the assembly frame, wherein a pump body of the pump is disposed in the pump slot with the pump mounted to the assembly frame.

87. The method of claim 86, wherein dismounting the guide rod of the assembly frame such that the guide rod is withdrawn from the guide aperture through the guide plate of the coupler includes: disconnecting the guide rod from a motor mounting of the assembly frame, the motor mounting supporting the electric motor; and passing the guide rod through a rod aperture formed in a mounting frame of the assembly frame, the mounting frame configured to support the pump.

88. The method of any one of claims 86 and 87, wherein disconnecting the guide plate from the linear displacer of the drive includes: unthreading the guide plate from the linear displacer.

89. The method of any one of claims 86-88, wherein disconnecting the guide plate from the linear displacer of the drive includes: disconnecting an adaptor of the coupler from the guide plate, the adaptor connected to the linear displacer.

90. The method of claim 89, wherein disconnecting the adaptor of the coupler from the guide plate includes: removing a plurality of coupler fasteners fixing the adaptor to the guide plate.

91. The method of any one of claims 89 and 90, wherein disconnecting the adaptor of the coupler from the guide plate includes: shifting the guide plate away from the rotational axis such that the adaptor is withdrawn from a drive slot of the guide plate.

92. The method of any one of claims 87-91, wherein disconnecting the drive from the rotor of the electric motor includes: removing a plurality of drive couplers fixing a nut of the drive to the rotor.

93. The method of claim 92, wherein removing the plurality of drive couplers fixing the nut of the drive to the rotor includes accessing the plurality of drive couplers at a location outside of the electric motor.

94. The method of any one of claims 87-93, further comprising: shifting the drive in a second axial direction along the rotational axis of the electric motor and towards the electric motor such that the drive passes within the pump slot formed; connecting the drive to the rotor; connecting the guide plate to the linear displacer; and mounting the guide rod such that the guide rod is disposed within the guide aperture through the guide plate.

95. A wiper assembly comprising: a housing disposed about an axis; a holder disposed within the housing, the holder having a first mount groove disposed on an inner side of the holder, the first mount groove extending circumferentially and axially relative to the axis; and a first wiper disposed in the first mount groove.

96. The wiper assembly of claim 95, wherein:the holder includes a second mount groove disposed on the inner side of the holder, the second mount groove extending circumferentially and axially relative to the axis; and a second wiper is disposed in the second mount groove.

97. The wiper assembly of claim 96, wherein the first mount groove does not intersect with the second mount groove.

98. The wiper assembly of any one of claims 96 and 97, wherein the second wiper is formed from felt.

99. The wiper assembly of any one of claims 95-98, wherein the first wiper is formed from felt.

100. The wiper assembly of any one of claims 95-99, wherein the housing comprises: a mount body; and a cap connectable to the mount body; wherein the holder is disposed in a holding chamber defined by the mount body and the cap.

101. The wiper assembly of any one of claims 95-100, further comprising: a first washer disposed on a first axial side of the holder.

102. The wiper assembly of claim 101, further comprising: a second washer disposed on a second axial side of the holder.

103. The wiper assembly of claim 102, wherein the second washer is formed from felt.

104. The wiper assembly of any one of claims 101-103, wherein the first washer is formed from felt.

105. A drive comprising: a rotator configured to rotate on a rotational axis; a linear displacer elongate along the rotational axis, the linear displacer configured to displace axially due to rotation of the rotator, wherein the linear displacer includes exterior threading; and a first wiper assembly disposed around the linear displacer such that the linear displacer extends through the first wiper assembly, wherein the first wiper assembly is formed by the wiper assembly of any one of claims 95-104, and wherein the first wiper of the first wiperassembly extends into the exterior threading to interface with the linear displacer.

106. The drive of claim 105, further comprising: a second wiper assembly disposed around the linear displacer such that the linear displacer extends through the second wiper assembly, wherein the second wiper assembly is formed by the wiper assembly of any one of claims 95-104, and wherein the first wiper of the second wiper assembly extends into the exterior threading to interface with the linear displacer.

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