CA1334816C - Cooling and combustion air filtering system for a tractor - Google Patents
Cooling and combustion air filtering system for a tractorInfo
- Publication number
- CA1334816C CA1334816C CA000616711A CA616711A CA1334816C CA 1334816 C CA1334816 C CA 1334816C CA 000616711 A CA000616711 A CA 000616711A CA 616711 A CA616711 A CA 616711A CA 1334816 C CA1334816 C CA 1334816C
- Authority
- CA
- Canada
- Prior art keywords
- radiator
- air
- engine
- tractor
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
A lawn and garden tractor includes a water cooled engine having a radiator mounted horizontally over the engine. A
first screen is located directly upon and covers the core of the radiator while a further screen having a top and depending front, rear and opposite side walls is positioned over the first screen and has a partial bottom wall located forwardly of the radiator and containing an opening receiving the engine combustion air intake pipe. The openings in the screens are sized such that only particles which will pass through the radiator will pass through both screens.
first screen is located directly upon and covers the core of the radiator while a further screen having a top and depending front, rear and opposite side walls is positioned over the first screen and has a partial bottom wall located forwardly of the radiator and containing an opening receiving the engine combustion air intake pipe. The openings in the screens are sized such that only particles which will pass through the radiator will pass through both screens.
Description
~33~816 COOLING AND COMBU8~ION AIR FILTERING ~YD~M FOR A TRACTOR
Related Application This is a divisional of Canadian application Serial Number 604,977 filed on 06 July 1989.
Background of the Invention The present invention relates to a tractor and more specifically relates to a system for filtering cooling air for the radiator of the tractor and combustion air for the engine of the tractor.
It is well known to enclose a tractor engine with a hood and associated baffles or panels in such a way that relatively clean combustion air enters the air filter leading to the engine carburetor. Typically, when the engine is water-cooled, the air that flows through the radiator for removing heat therefrom comes from a zone that is different than that from which the combustion air comes. This has the disadvantage of requiring two different filtering or screening assemblies to be provided in order to ensure that the air flowing into the carburetor or through the radiator is relatively free of debris that will adversely affect carburetion or will clog the air passages of the radiator so as to adversely affect cooling of the engine.
Summary of the Invention According to the present invention, a tractor is provided with an improved air filtering or screening system for ensuring that relative clean air is present both for cooling the radiator and for combustion in the engine.
An object of the invention is to provide an air filtering system which incorporates a filter or screen assembly to ensure that the air used for cooling and for combustion is relatively clean.
A more specific object of the invention is to provide an air filtering system including an air intake screen through which air passes prior to passing through the radiator or into a combustion air cleaner.
Yet another object of the invention is to provide an air filtering system which includes an air intake screen mounted A
-~ 133~81~
in series with a radiator screen at the upstream side of a radiator, with the screens having opening sizes selected so as to prevent the passage of debris of a type or size that would clog the radiator air passages. This object of the invention is accomplished by providing a flat radiator screen covering the upstream side of the core of the radiator and by providing an air intake screen in the form of a housing having top and side walls positioned over the radiator screen and releasably clamped thereagainst by spring metal snap locks or latches carried by the radiator. It is a further feature of the invention to use the air intake screen to prevent relatively large pieces of debris from entering the intake of the combustion air cleaner.
These and other objects will become more apparent from a reading of the ensuing description together with the appended drawings.
Brief Description of the Drawinqs FIG. 1 is a right front perspective view of a lawn and garden tractor incorporating the air filtering system of the present invention.
FIG. 2 is a somewhat schematic, right side elevational view, with portions broken away, of a tractor equipped with a horizontal radiator located above the engine.
FIG. 3 is a side elevational view showing the radiator and dual screen assembly of the filtering system mounted in series to the top of an internal combustion engine having an air cleaner inlet disposed for receiving air filtered by the housing-like air intake screen of the screen assembly.
FIG. 4 is a perspective view showing the dual screen assembly and radiator of FIG. 3 with the air intake screen being shown in exploded fashion away from a flat radiator screen positioned on the upstream side of the radiator and showing the spring metal snap latches for releasably clamping the air intake screen against the radiator screen.
FIG. 5 is a top view of the air intake screen of the dual screen assembly.
.
1~3~816 FIG. 6 is a partial exploded view showing the hood and associated baffles for ensuring that engine-heated air is not recirculated through the engine radiator.
Description of the Preferred Embodiment Referring now to FIG. 1, therein is shown a work vehicle in the form of a lawn and garden tractor 20 including a longitudinally extending main frame 22 supported on a front pair of steerable wheels 30 and 32 and a rear pair of drive wheels 46 and 48. An engine 44 (FIG. 2) is supported on a lo forward portion of the frame 22 in a compartment 262 defined in part by a hood 50 formed of a single piece including opposite side walls extending beside the engine, a top wall 52 extending over the engine and having a pair of air inlet grills 54 in opposite side portions thereof and a forward end portion 56 defined by a wrap around headlight assembly 58 disposed above an air exhaust grill 60.
Mounted to the frame 22 rearwardly of the hood 50 is a combined operator platform and fender deck structure 68. A
seat assembly 76 is mounted to the structure 68 so as to position an operator within easy reach of various tractor and implement controls including a steering wheel 38.
Referring now also to FIGS. 2 - 6, there is shown a combined cooling and combustion air filtering system for the tractor 20. Specifically, mounted to the top of the engine 44 is a radiator 260 which contains a source of cooling fluid for the engine. A fan is located above the engine 44 and beneath the radiator 260 and acts to draw air through the radiator via the grills 54 in the hood 50 and to exhaust air forwardly out the grill 60. The air filtering system includes a housing-like air intake screen 266 mounted to the top or upstream side of the radiator for preventing large debris particles from being drawn into and possibly clogging air passages of the radiator. The screen 266 also extends over a combustion air cleaner inlet 268 ~FIG.3), located forwardly of the radiator 260, so as to prevent large debris particles from entering the air cleaner.
A
~ ~ 13~8~6 Specifically, the air intake screen 266 consists of a top wall 270 joined to depending right and left side walls 272 and 276 and depending rear and front walls 274 and 278, these walls all being perforated throughout with apertures preferably having a diameter of approximately 1.14 millimeters which results in 36% of the area of these walls being open to permit air flow. A horizontal bottom or skirt member 286 is joined to and extends outwardly from the bottoms of the screen walls 272-278 and has a forward portion extending rearwardly beneath a front portion of the top wall 270 and terminating at a rear edge 294 bordering a front edge of the core section of the radiator 260. An aperture 310 is provided in a forward portion of the skirt member 286 and receives the inlet 268 of the air cleaner. Provided in opposite sides of the member 286 are slots 288 receiving ends of respective spring metal snap locks or latches 290 carried by the radiator 260 and serving to releasably clamp the air intake screen 266 in place over the radiator and air cleaner inlet 268.
The air filtering system further includes a rectangular, horizontal radiator screen 304 placed directly upon the core section of the radiator 260. The skirt member 286 of the air intake screen 266 engages the perimeter of the radiator screen 304 and holds the latter firmly in place when the latches 290 are latched. The radiator screen 304 preferably comprises wire mesh having approximately 2 millimeter square openings.
The screen 304 operates to intercept any long strands of debris that pass through the air intake screen 266 and thus prevents these long strands from hair-pinning on the radiator core. The screen 304 also intercepts fuzz-like particles which might otherwise collect on the radiator core. The respective sizes of the openings through the intake and radiator screens are such that only those types of particles that will easily pass through the radiator core will pass through both screens. In fact, field experience shows that this combination of screens eliminates the necessity for cleaning the radiator for the life of the vehicle.
` 133~816 Cleaning of the intake and radiator screens 266 and 304 may easily be accomplished by first pivoting the hood 50 upwardly to an open position about the conventional pivot connection (not shown) the lower front portion of the hood has with the tractor frame 22. This exposes the screens 266 and 304 for removal which can be accomplished by releasing the latches 290 and lifting the screens away from the engine. The pivoting of the hood 50 is facilitated by the provision of a hand access recess 336 (FIG. 6) in a forward central location of an upper end of a steering shaft support pedestal 338, the recess being located to permit an operator to easily grasp the rear edge 339 of the hood 50 when the hood is in its closed position with the edge 339 disposed about the upper end of the pedestal.
To prevent air from entering the flow of cooling and combustion air from a location other than above the hood 50, baffles are provided internally of the hood. Specifically, referring to FIG. 6, it can be seen that a baffle 320 having a U-shaped opening 322 is fixed to the underside of the hood, the baffle having a seal which engages the periphery of the front and sides of screen skirt member 286 when the hood is closed so as to prevent air from recirculating through the radiator 260 thereby ~;m;n;shing the cooling efficiency of the radiator. Working together with the baffle 320 is an upright baffle plate 324 which is mounted to the frame 22 at a location behind the engine 44.
Also shown in FIG. 6 is a baffle assembly 330 which would be provided in lieu of the baffle 320 for preventing the recirculation of cooling air through the cooling shroud of an air cooled engine (not shown) when the vehicle 20 is equipped with such an engine. When the tractor 20 is equipped with an air cooled engine, the inlet grills 54 of the hood 50 are eliminated and air is drawn in from a zone rearwardly of the pedestal 338. The baffle 330 channels this air to an inlet defined by an upper portion of the shroud and for this purpose includes a horizontal portion that fits horizontally above the engine and is provided with an aperture 332 that registers A
~ 133~816 with the cooling shroud inlet and includes an upright portion 334 having a seal fixed to its upper edge for engagement with the underside of the hood 50 when the latter is closed.
A
Related Application This is a divisional of Canadian application Serial Number 604,977 filed on 06 July 1989.
Background of the Invention The present invention relates to a tractor and more specifically relates to a system for filtering cooling air for the radiator of the tractor and combustion air for the engine of the tractor.
It is well known to enclose a tractor engine with a hood and associated baffles or panels in such a way that relatively clean combustion air enters the air filter leading to the engine carburetor. Typically, when the engine is water-cooled, the air that flows through the radiator for removing heat therefrom comes from a zone that is different than that from which the combustion air comes. This has the disadvantage of requiring two different filtering or screening assemblies to be provided in order to ensure that the air flowing into the carburetor or through the radiator is relatively free of debris that will adversely affect carburetion or will clog the air passages of the radiator so as to adversely affect cooling of the engine.
Summary of the Invention According to the present invention, a tractor is provided with an improved air filtering or screening system for ensuring that relative clean air is present both for cooling the radiator and for combustion in the engine.
An object of the invention is to provide an air filtering system which incorporates a filter or screen assembly to ensure that the air used for cooling and for combustion is relatively clean.
A more specific object of the invention is to provide an air filtering system including an air intake screen through which air passes prior to passing through the radiator or into a combustion air cleaner.
Yet another object of the invention is to provide an air filtering system which includes an air intake screen mounted A
-~ 133~81~
in series with a radiator screen at the upstream side of a radiator, with the screens having opening sizes selected so as to prevent the passage of debris of a type or size that would clog the radiator air passages. This object of the invention is accomplished by providing a flat radiator screen covering the upstream side of the core of the radiator and by providing an air intake screen in the form of a housing having top and side walls positioned over the radiator screen and releasably clamped thereagainst by spring metal snap locks or latches carried by the radiator. It is a further feature of the invention to use the air intake screen to prevent relatively large pieces of debris from entering the intake of the combustion air cleaner.
These and other objects will become more apparent from a reading of the ensuing description together with the appended drawings.
Brief Description of the Drawinqs FIG. 1 is a right front perspective view of a lawn and garden tractor incorporating the air filtering system of the present invention.
FIG. 2 is a somewhat schematic, right side elevational view, with portions broken away, of a tractor equipped with a horizontal radiator located above the engine.
FIG. 3 is a side elevational view showing the radiator and dual screen assembly of the filtering system mounted in series to the top of an internal combustion engine having an air cleaner inlet disposed for receiving air filtered by the housing-like air intake screen of the screen assembly.
FIG. 4 is a perspective view showing the dual screen assembly and radiator of FIG. 3 with the air intake screen being shown in exploded fashion away from a flat radiator screen positioned on the upstream side of the radiator and showing the spring metal snap latches for releasably clamping the air intake screen against the radiator screen.
FIG. 5 is a top view of the air intake screen of the dual screen assembly.
.
1~3~816 FIG. 6 is a partial exploded view showing the hood and associated baffles for ensuring that engine-heated air is not recirculated through the engine radiator.
Description of the Preferred Embodiment Referring now to FIG. 1, therein is shown a work vehicle in the form of a lawn and garden tractor 20 including a longitudinally extending main frame 22 supported on a front pair of steerable wheels 30 and 32 and a rear pair of drive wheels 46 and 48. An engine 44 (FIG. 2) is supported on a lo forward portion of the frame 22 in a compartment 262 defined in part by a hood 50 formed of a single piece including opposite side walls extending beside the engine, a top wall 52 extending over the engine and having a pair of air inlet grills 54 in opposite side portions thereof and a forward end portion 56 defined by a wrap around headlight assembly 58 disposed above an air exhaust grill 60.
Mounted to the frame 22 rearwardly of the hood 50 is a combined operator platform and fender deck structure 68. A
seat assembly 76 is mounted to the structure 68 so as to position an operator within easy reach of various tractor and implement controls including a steering wheel 38.
Referring now also to FIGS. 2 - 6, there is shown a combined cooling and combustion air filtering system for the tractor 20. Specifically, mounted to the top of the engine 44 is a radiator 260 which contains a source of cooling fluid for the engine. A fan is located above the engine 44 and beneath the radiator 260 and acts to draw air through the radiator via the grills 54 in the hood 50 and to exhaust air forwardly out the grill 60. The air filtering system includes a housing-like air intake screen 266 mounted to the top or upstream side of the radiator for preventing large debris particles from being drawn into and possibly clogging air passages of the radiator. The screen 266 also extends over a combustion air cleaner inlet 268 ~FIG.3), located forwardly of the radiator 260, so as to prevent large debris particles from entering the air cleaner.
A
~ ~ 13~8~6 Specifically, the air intake screen 266 consists of a top wall 270 joined to depending right and left side walls 272 and 276 and depending rear and front walls 274 and 278, these walls all being perforated throughout with apertures preferably having a diameter of approximately 1.14 millimeters which results in 36% of the area of these walls being open to permit air flow. A horizontal bottom or skirt member 286 is joined to and extends outwardly from the bottoms of the screen walls 272-278 and has a forward portion extending rearwardly beneath a front portion of the top wall 270 and terminating at a rear edge 294 bordering a front edge of the core section of the radiator 260. An aperture 310 is provided in a forward portion of the skirt member 286 and receives the inlet 268 of the air cleaner. Provided in opposite sides of the member 286 are slots 288 receiving ends of respective spring metal snap locks or latches 290 carried by the radiator 260 and serving to releasably clamp the air intake screen 266 in place over the radiator and air cleaner inlet 268.
The air filtering system further includes a rectangular, horizontal radiator screen 304 placed directly upon the core section of the radiator 260. The skirt member 286 of the air intake screen 266 engages the perimeter of the radiator screen 304 and holds the latter firmly in place when the latches 290 are latched. The radiator screen 304 preferably comprises wire mesh having approximately 2 millimeter square openings.
The screen 304 operates to intercept any long strands of debris that pass through the air intake screen 266 and thus prevents these long strands from hair-pinning on the radiator core. The screen 304 also intercepts fuzz-like particles which might otherwise collect on the radiator core. The respective sizes of the openings through the intake and radiator screens are such that only those types of particles that will easily pass through the radiator core will pass through both screens. In fact, field experience shows that this combination of screens eliminates the necessity for cleaning the radiator for the life of the vehicle.
` 133~816 Cleaning of the intake and radiator screens 266 and 304 may easily be accomplished by first pivoting the hood 50 upwardly to an open position about the conventional pivot connection (not shown) the lower front portion of the hood has with the tractor frame 22. This exposes the screens 266 and 304 for removal which can be accomplished by releasing the latches 290 and lifting the screens away from the engine. The pivoting of the hood 50 is facilitated by the provision of a hand access recess 336 (FIG. 6) in a forward central location of an upper end of a steering shaft support pedestal 338, the recess being located to permit an operator to easily grasp the rear edge 339 of the hood 50 when the hood is in its closed position with the edge 339 disposed about the upper end of the pedestal.
To prevent air from entering the flow of cooling and combustion air from a location other than above the hood 50, baffles are provided internally of the hood. Specifically, referring to FIG. 6, it can be seen that a baffle 320 having a U-shaped opening 322 is fixed to the underside of the hood, the baffle having a seal which engages the periphery of the front and sides of screen skirt member 286 when the hood is closed so as to prevent air from recirculating through the radiator 260 thereby ~;m;n;shing the cooling efficiency of the radiator. Working together with the baffle 320 is an upright baffle plate 324 which is mounted to the frame 22 at a location behind the engine 44.
Also shown in FIG. 6 is a baffle assembly 330 which would be provided in lieu of the baffle 320 for preventing the recirculation of cooling air through the cooling shroud of an air cooled engine (not shown) when the vehicle 20 is equipped with such an engine. When the tractor 20 is equipped with an air cooled engine, the inlet grills 54 of the hood 50 are eliminated and air is drawn in from a zone rearwardly of the pedestal 338. The baffle 330 channels this air to an inlet defined by an upper portion of the shroud and for this purpose includes a horizontal portion that fits horizontally above the engine and is provided with an aperture 332 that registers A
~ 133~816 with the cooling shroud inlet and includes an upright portion 334 having a seal fixed to its upper edge for engagement with the underside of the hood 50 when the latter is closed.
A
Claims (4)
1. In a tractor including a liquid cooled engine, a radiator mounted above the engine, a fan interposed between the radiator and the engine for drawing air in through the radiator and an engine combustion air cleaner mounted adjacent the engine and having an air inlet, an improved air filtering system comprising:
an air intake filter releasably connected to said radiator and enclosing said air inlet for simultaneously filtering air entering said radiator and said air inlet.
an air intake filter releasably connected to said radiator and enclosing said air inlet for simultaneously filtering air entering said radiator and said air inlet.
2. The tractor of claim 1 wherein said radiator includes at least two snap latches releasably retaining said air intake filter in sealed engagement with said radiator and in position encompassing said air inlet.
3. The tractor of claim 2 wherein said air intake filter includes:
an air impervious base having at least two apertures formed therein, one of said apertures having an area overlying and substantially equal to an area of said radiator through which air passes and the other of said apertures snugly receiving a duct forming said air inlet;
said base having receptacles formed therein for receiving portions of said snap latches;
said air impervious base being joined to the bottom of opposite side, front and rear walls which are in turn joined to a top wall, with all of said walls being made of a screen material for preventing debris from passing therethrough.
an air impervious base having at least two apertures formed therein, one of said apertures having an area overlying and substantially equal to an area of said radiator through which air passes and the other of said apertures snugly receiving a duct forming said air inlet;
said base having receptacles formed therein for receiving portions of said snap latches;
said air impervious base being joined to the bottom of opposite side, front and rear walls which are in turn joined to a top wall, with all of said walls being made of a screen material for preventing debris from passing therethrough.
4. the tractor of claim 3 wherein said air filtering system further includes:
a radiator filter positioned on an upper surface of said radiator and having a perimeter engaged by a lower surface of said base of the air intake filter whereby the snap latches serve to releasably hold the radiator filter in place; and said intake filter and radiator filter respectively having filter openings sized such as to prevent any debris from passing through both said intake and radiator filters which is not capable of passing completely through said radiator without becoming lodged therein.
a radiator filter positioned on an upper surface of said radiator and having a perimeter engaged by a lower surface of said base of the air intake filter whereby the snap latches serve to releasably hold the radiator filter in place; and said intake filter and radiator filter respectively having filter openings sized such as to prevent any debris from passing through both said intake and radiator filters which is not capable of passing completely through said radiator without becoming lodged therein.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US226,249 | 1988-07-29 | ||
| US07/226,249 US4969533A (en) | 1988-07-29 | 1988-07-29 | Work vehicle |
| CA000604977A CA1325888C (en) | 1988-07-29 | 1989-07-06 | Work vehicle |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000604977A Division CA1325888C (en) | 1988-07-29 | 1989-07-06 | Work vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1334816C true CA1334816C (en) | 1995-03-21 |
Family
ID=25672863
Family Applications (6)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000616712A Expired - Fee Related CA1335422C (en) | 1988-07-29 | 1993-09-09 | Hydrostatic transmission bypass valve assembly |
| CA000616713A Expired - Fee Related CA1334369C (en) | 1988-07-29 | 1993-09-09 | Steering wheel tilt mechanism |
| CA000616715A Expired - Fee Related CA1334368C (en) | 1988-07-29 | 1993-09-09 | Steering effort and responsiveness adjustment |
| CA000616710A Expired - Fee Related CA1335421C (en) | 1988-07-29 | 1993-09-09 | Speed and direction control system for tractor hydrostatic transmission |
| CA000616711A Expired - Fee Related CA1334816C (en) | 1988-07-29 | 1993-09-09 | Cooling and combustion air filtering system for a tractor |
| CA000616714A Expired - Fee Related CA1336105C (en) | 1988-07-29 | 1993-09-09 | Tractor operator presence indicator switch mounting |
Family Applications Before (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000616712A Expired - Fee Related CA1335422C (en) | 1988-07-29 | 1993-09-09 | Hydrostatic transmission bypass valve assembly |
| CA000616713A Expired - Fee Related CA1334369C (en) | 1988-07-29 | 1993-09-09 | Steering wheel tilt mechanism |
| CA000616715A Expired - Fee Related CA1334368C (en) | 1988-07-29 | 1993-09-09 | Steering effort and responsiveness adjustment |
| CA000616710A Expired - Fee Related CA1335421C (en) | 1988-07-29 | 1993-09-09 | Speed and direction control system for tractor hydrostatic transmission |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000616714A Expired - Fee Related CA1336105C (en) | 1988-07-29 | 1993-09-09 | Tractor operator presence indicator switch mounting |
Country Status (1)
| Country | Link |
|---|---|
| CA (6) | CA1335422C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1392080B1 (en) * | 2008-12-05 | 2012-02-09 | Ggp Italy Spa | SAFETY DEVICE CONNECTED TO THE PRESENCE OF THE OPERATOR ON THE SEAT OF A TRACTOR |
-
1993
- 1993-09-09 CA CA000616712A patent/CA1335422C/en not_active Expired - Fee Related
- 1993-09-09 CA CA000616713A patent/CA1334369C/en not_active Expired - Fee Related
- 1993-09-09 CA CA000616715A patent/CA1334368C/en not_active Expired - Fee Related
- 1993-09-09 CA CA000616710A patent/CA1335421C/en not_active Expired - Fee Related
- 1993-09-09 CA CA000616711A patent/CA1334816C/en not_active Expired - Fee Related
- 1993-09-09 CA CA000616714A patent/CA1336105C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA1336105C (en) | 1995-06-27 |
| CA1334369C (en) | 1995-02-14 |
| CA1335422C (en) | 1995-05-02 |
| CA1334368C (en) | 1995-02-14 |
| CA1335421C (en) | 1995-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |