The present application is based on and claims priority under 35 U.S.C. ยง119 to Japanese Patent Application No. 2005-277287, filed on Sep. 26, 2005, the entire contents of which is expressly incorporated by reference herein.
1. Field of the Inventions
The present inventions relate to an installation structure for a compressor, which compresses and provides air to an engine.
2. Description of the Related Art
Conventionally, small boats, automobiles, personal watercraft and other vehicles are equipped with a compressor which provides air to an engine (see e.g. U.S. Pat. No. 6,568,376). For example, the compressor of a personal watercraft is typically installed on an installation mount located at the front portion of the watercraft's engine.
The installation of the compressor is facilitated by the inclusion of an opening in the body of the personal watercraft. The opening permits access for repairs and inspection of the engine and related parts. The opening is covered by a lid member and is located above the front portion of the engine. Despite the convenience provided by the opening, compressor installation and removal are still very difficult tasks due to the configuration of the engine and related parts.
When installing the compressor on the installation mount of the engine, a tedious and difficult process must be followed. The compressor must first be passed it into the body through the opening. Then the compressor is moved rearward from the front portion of the engine along a crankshaft axis until being positioned adjacent the installation mount. Finally, the compressor is aligned with and placed onto the installation mount. Fasteners such as bolts can be used to secure the compressor to the installation mount parallel to the crankshaft. This procedure can be reversed in order to remove the compressor.
Thus, the installation and removal of the compressor can be very difficult. Additionally, sufficient space within the engine compartment must exist to move the compressor in the direction parallel to the crankshaft. Otherwise, the space for the compressor must be widened.
An aspect of at least one of the embodiments disclosed herein includes the realization that at least one of the difficulties described above with regard to the removal and installation of a compressor can be reduced or eliminated by changing the mounting arrangement for the compressor. For example, the mounting arrangement can be designed to reduce, minimize, or eliminate the need to move the compressor parallel to the crankshaft of the engine after the compressor is inserted through the access opening.
Thus, in accordance with an embodiment, an engine is provided that can be disposed in an engine compartment which includes an opening for accessing the engine. The engine can include a crankshaft, a front end, and an installation structure for a compressor. The engine can comprise an installation mount that can be disposed at the front end of the engine. The installation mount can extend substantially parallel to the crankshaft of the engine. The installation mount can include a surface configured for mounting the compressor. The installation mount can also be configured with the surface thereof facing toward the opening of the engine compartment.
In accordance with another embodiment, a marine engine assembly is provided for a personal watercraft. The assembly can comprise an engine, a compressor, and an installation structure. The engine can include a crankshaft and a front end. The engine can be disposed in an engine compartment of the personal watercraft. The engine compartment can have an opening for accessing the engine.
The compressor can include an impeller, a housing containing the impeller, a drive shaft of the impeller, and a directly-coupled gear train. The directly-coupled gear train can include a drive gear connected to the drive shaft and an intermediate gear meshed with the drive gear and the crankshaft. The installation structure for the compressor can comprise an installation mount and a plurality of screw holes disposed through the installation mount.
The installation mount can extend substantially parallel to the crankshaft of the engine. The installation mount can have a surface and can be disposed at the front end of the engine with the surface facing toward the opening of the engine compartment. The surface can be sized and configured to allow the compressor to be mounted on the surface with the crankshaft of the engine being meshed to the drive shaft of the compressor via the directly-coupled gear train of the compressor so as to transmit driving force to the drive gear. The plurality of screw holes can be oriented perpendicular relative to the surface. Further, the screw holes can be configured to receive bolts for attaching the compressor to the mounting surface.
The above mentioned and other features of the inventions disclosed herein are described below with reference to the drawings of the preferred embodiments. The illustrated embodiments are intended to illustrate, but not to limit the inventions. The drawings contain the following figures:
The personal watercraft 10 can have a body 11 that can include a deck 11a and hull 11b. Steering handlebars (not shown) can be located slightly ahead of the center on the body 11. A seat 12 can also be provided at about the center of an upper part of the body 11. The seat 12, which can be removable from the deck 11a, can be mounted to an opening 12a generally at the center of the deck 11a.
The inside of the body 11 can be divided into two sections; an engine compartment 13 in the front half of the body 11, and a pump compartment 14 in the rear half thereof. However, the inside of the body 11 can be a single compartment or it can be divided into additional compartments. However, other configurations can also be used.
The engine compartment 13 can include an engine 20, an intake system 15, and an exhaust system 16 (see
At the front and rear of the engine compartment 13, air ducts (not shown) can be provided to introduce or circulate external air into or through the engine compartment 13. These air ducts can extend vertically from the top of the body 11 to the bottom of the engine compartment 13. The air ducts can be designed to take external air from the top end through a waterproof structure (not shown) on the deck 11a and lead the air from the bottom end into the engine compartment 13.
A fuel tank 18 for storing fuel can be provided at the front of the engine compartment 13. The engine 20 can be provided at the bottom center of the body 11. The engine 20 and its surrounding parts can be located below the seat 12 (opening 12a), and can be accessed from the outside through the opening 12a when the seat 12 is removed. As such, the opening 12a can be provided above the engine 20 in the body 11 of the personal watercraft 10.
The engine 20 can be a four-cycle, four-cylinder engine. As shown in
Inside the cylinder body 23 and the cylinder head 24 are housed pistons 26 connected to the crankshaft 21 through connecting rods 25 for up and down movement. The up and down motion of the pistons 26 can be transmitted to the crankshaft 21 to produce the rotational motion of the crankshaft 21. Cylinders 27 formed in the cylinder head 24 are each provided with intake and exhaust valves (not shown).
As shown in
In operation, the intake valve can open when taking air in to mix the air from the intake system 15 through the inlet port with the fuel from a fuel supply system (described in greater detail below). At the end of the intake stroke, the air-fuel mixture can be sent to each cylinder 27 for combustion and the intake valve can be closed when the combusted gas is to be discharged. The exhaust port can open to allow the combusted gas to be discharged by each cylinder 27 via the exhaust port to the exhaust system 16. Subsequently, the exhaust port can close at the end of the exhaust stroke of the piston 26.
The intake box 29 can be located in the area on the portside of the body 11 between the engine 20 and fuel tank 18. In some embodiments, the intake box 29 can be spaced from the engine 20. Inside of the intake box 29, an air filter (not shown) can be provided. The intake box 29 can be configured to take the air from the engine compartment 13, remove foreign substances from the air using the air filter, and then guide the air to the compressor 31 via the air passage 29a.
As shown in
The compressor 31 can also be provided with a housing 34, which can include two vents. One of the vents can be an inlet port 33a, which can be connected to the air passage 29a and can draw in the air sent from the intake box 29. The other vent can be an outlet port 33b, which can be connected to the air passage 15d and can guide the air taken in through the inlet port 33a to the intercooler 28.
The housing 34 can contain a rotary part 35 that can include a drive shaft 35a and an impeller 35b. The impeller 35b can be connected to the front end of the drive shaft 35a in order to be rotatable with the drive shaft 35a. The rotary part 35 can allow the impeller 35b to be mounted in the housing 34 such that the impeller 35b extends into the inlet port 33a.
According to another embodiment, the drive shaft 35a and the crankshaft 21 of the engine 20 can be connected via a directly-coupled gear train. The directly-coupled gear train can include at least two gears. In an embodiment, the directly-coupled gear train can include a drive gear 36. As shown in
The compressor 31 can be driven by crankshaft torque, which can be transmitted via the gear train to the drive shaft 35a and rotary part 35. The transmission of torque to the rotary part 35 can rotate the impeller 35b. The rotation of the impeller 35b can compress the air from the air passage 29a to the inlet port 33a, and then discharge the compressed air from the outlet port 33b to the air passage 15d. In some embodiments, the drive gear 36 of the compressor can be connected to the crankshaft 21 of the engine 20, such as by direct meshing engagement to the intermediate gear 37 in the directly-coupled gear train, which can transmit driving force to the drive gear 35c.
In this regard, when the compressor 31 is installed on the installation mount 32, the connection of the compressor 31 to the directly-coupled gear train can ease the installation of the compressor 31. Moreover, the drive shaft 35a of the compressor 31 can be connected via the directly-coupled gear train to the crankshaft 21 of the engine 20, which can prevent time lag of torque transmission and excessive supercharging. Further, in such a configuration, each of the plurality of gears in the directly-coupled gear train can be smaller in order to save space. This multiplicity can also enable alternative changes of the gears and can change the performance of the compressor itself.
According to yet another embodiment, a torque fluctuation absorbing mechanism can be provided on part of a gear in the directly-coupled gear train, which can be located on the side of the crankcase 22 containing the crankshaft 21. The torque fluctuation absorbing mechanism can be configured to prevent a decrease in engine revolution at a time of sharp deceleration. The torque fluctuation mechanism can also be configured to prevent damages to the compressor 31, for example, by absorbing torque fluctuations which occur during the engine strokes (intake, compression, explosion, and exhaust).
In some embodiments, the drive gear 36 can be provided with a one-way clutch 36a, which can function as a torque fluctuation absorbing mechanism. If the revolution speed of the crankshaft 21 slows due to deceleration or other reason, the one-way clutch 36a can idle the drive gear 36, in order to prevent the compressor 31 from stopping suddenly. The one-way clutch 36 can also absorb the torque fluctuations, which occur in the engine strokes (intake, compression, power, and exhaust). The one-way clutch 36a can thus protect the compressor 31 and the gears in the directly-coupled gear train from being damaged.
The compressor 31 can be secured on the installation mount 32 with multiple bolts 38. The bolts 38 can be inserted through vertical screw holes 38a, which can be formed on the installation mount 32. The screw holes 38a can be oriented perpendicular relative to the surface 32a of the installation mount 32, and can be threaded. Insertion holes 38b can also be provided in the housing 34 of the compressor 31. For example, the insertion holes 38b can be punctured through one to another side of the housing 34. Accordingly, the installation operation can performed by aligning the compressor 31 on the installation mount 32 and then inserting the bolts 38 through the insertion holes 38a and into the screw holes 38a. Such a configuration can facilitate the installation operation.
Thus, the compressor 31 can be secured on the surface 32a of the installation mount 32 by screwing the bolts 38 into the screw holes 38a after being passed through the insertion holes 38b. In some embodiments, the installation structure can enable the drive gear 35c and intermediate gear 37 to meshingly engage with each other when the compressor is installed on the surface 32a of the installation mount 32.
The intercooler 28 can be provided on the slightly starboard side at the front end of the engine 20 in the body 11, which can result in juxtaposition with the compressor 31. The intercooler 28 can cool the compressed air from the compressor 31 while it passes through the air passage 15d.
The cooling process can increase the density of the compressed air. The compressed air can then be sent to the throttle body through the air passage 15c, illustrated in
In other embodiments, the surge tank 15b can be connected to the rear end of the throttle body and can be provided at the top of the starboard side of the engine 20, as shown in the top plan view of
Each of the multi-furcated intake pipes 15a can extend obliquely upward from the upstream end, which can be connected to the surge tank 15b. The downstream end can be connected to the inlet port of the cylinder 27. The surge tank 15b can prevent intake pulsation of the compressed air from the intercooler 28, and then deliver the compressed air of constant density to the multi-furcated intake pipes 15a.
The fuel supply system (not shown) can provide fuel from the fuel tank 18 (
The fuel injector can atomize the fuel into a fine mist, which can then be injected into the cylinder 27, illustrated in
With reference to
In some embodiments, as shown in
The water lock can be a cylindrical tank of a large diameter. An exhaust gas pipe (not shown) can extend rearwardly from the rear top of the water lock. The exhaust gas pipe can extend toward the top and then in the lower rearward direction. As shown in
At the rear of the engine 20, a pump drive shaft 42 can be connected to the crankshaft via a coupling 21a. The coupling 21a can extend into a pump compartment 14 behind the pump drive shaft. The pump drive shaft 42, which can be connected to an impeller (not shown) in a jet pump 17a at the stern of the body 11, can rotate the impeller by transmitting the torque of the crankshaft 21 driven by the engine 20. In some embodiments, the pump drive shaft 42 can be a single shaft member, or it can be made from several separate shafts connected together.
As shown in
The propulsion unit 17 can be mounted to the bottom of the body 11 at the stern of the body 11 with the casing 41 separating the propulsion unit 17 from the main frame of the body 11. The pump drive shaft 42 can pass through the casing 41 and extend from the engine 20 to the jet pump 17a of the propulsion unit 17.
In some embodiments, a steering nozzle 45 can also be provided at the rear end of the jet pump 17a. The steering nozzle 45 can move the rear of the body 11 according to the steering handlebars operation in order to turn the personal watercraft 10 to the right or left. The rear of the steering nozzle 45 can also be provided with a reverse gate 46 that can move vertically to advance or reverse the personal watercraft 10. Apart from the systems described heretofore, the personal watercraft 10 can be provided with various devices for driving the vehicle. Such devices can include an electric box storing multiple components, a start switch, a variety of sensors, and/or other devices.
During operation, a driver can sit on the seat 12 and turn on the start switch, which can set the personal watercraft 10 in a standby mode. The driver can then operate the steering handlebars and a throttle operation element (not shown), which can be provided on the grip of the steering handlebars, to drive the personal watercraft 10 in a certain direction and a speed, as desired.
When stopping the personal watercraft 10, the driver can decelerate, stop the vehicle at a pier or dock, and then turn off the start switch. The driver can then open the lid of the opening 12a after removing the seat 12 from the body 11, and if necessary, insert their hands inside of the body 11 for maintenance, inspection, and repair of the engine 20, the compressor 31, and other parts. In order to inspect the compressor 31, the bolts 38 can be removed in order to remove the compressor 31 from the installation mount 32 of the engine 20.
In some embodiments of the installation structure 30, the opening 12a can be located on the deck 11a of the personal watercraft 10. The seat 12 can be removably mountable to the opening 12a. Additionally, in some embodiments, the installation mount 32 for the compressor 31 can be located at the front end of the engine 20 below the opening 12a. The compressor 31 can be installed on the surface 32a of the installation mount 32. Due to this structure, the compressor 31 can be installed by carrying the compressor 31 into the body 11 from the opening 12a, and then lowering the compressor 31 onto the surface 32a of the installation mount 32. This can ease the installation of the compressor 31 on the installation mount 32, and conserve space for installing the compressor 31. Additionally, such an orientation of the mount 32 can reduce, minimize, and/or eliminate the need to move the compressor 31 parallel to the crankshaft 21 during the installation or removal procedure.
Furthermore, the bolts 38 can be inserted downward into the insertion holes 38b on the housing 34, and tip ends of the bolts 38 can be screwed into the screw holes 38a of the installation mount 32 to secure the compressor 31 on the installation mount 32. This structure can ease the installation and removal of the compressor 31 to and from the installation mount 32 for maintenance.
Further, in such an embodiment, the drive shaft 35a of the compressor 31 and the crankshaft 21 of the engine 20 can be connected together, for example, by meshing engagement, via the directly-coupled gear train that can include the drive gear 35c, the intermediate gear 37 and the drive gear 36. This can prevent excessive supercharging, as well as the time lag of torque transmission from the crankshaft 21 to the compressor 31.
Installation of the compressor 31 on the installation mount 32 can be facilitated by the meshing engagement of the drive gear 35c of the compressor 31 with the intermediate gear 37. As mentioned above, the drive gear 36 can be provided with the one-way clutch 36a. The one-way clutch 36a can absorb the abrupt torque fluctuations along with the decreased engine revolutions at the time of sharp deceleration, thereby preventing the compressor 31 and the gears in the directly-coupled gear train from being damaged. The directly-coupled gear train can include the drive gear 35c, the intermediate gear 37, and the drive gear 36. Such a structure can enable the gears in the train to be smaller, which can also conserve space. Furthermore, this multiplicity can enable the alternative changes of the gears and easy change in performance of the compressor 31 itself.
The preferred embodiments and features of the installation structure 30 disclosed herein are not limited to the aforementioned embodiments, but may be modified as appropriate. For example, the installation structure 30 can be applied not only to personal watercraft, but to any vehicle that has an engine with a compressor, including automobiles and motorcycles. Further, in some embodiments, the directly-coupled gear train can include the drive gear 35c, the intermediate gear 37, and the drive gear 36. Other configurations can include and/or omit gears.
Furthermore, although the installation mount 32 can be below the opening 12a in some of the aforementioned embodiments, the locations of the opening and the installation mount can be anywhere, and preferably both the opening and the installation mount face each other. Additionally, although the one-way clutch 36a can be used as a torque fluctuation absorbing mechanism in some of the aforementioned embodiments, a rubber damper can also be used as an alternative. Thus, the arrangement and structure of the components that form the installation structure can be modified within the technical scope of the inventions described herein.
Accordingly, although the embodiments of the present inventions have been disclosed in the context of certain preferred embodiments and examples, it will be understood by those skilled in the art that the teachings herein extend beyond the specifically disclosed embodiments to other alternative embodiments and/or uses of the embodiments of the present inventions and obvious modifications and equivalents thereof.
Number | Date | Country | Kind |
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2005-277287 | Sep 2005 | JP | national |
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44348 | Jan 1982 | EP |
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1263608 | May 1996 | FR |
1389973 | Apr 1975 | GB |
57-062929 | Apr 1982 | JP |
57-062930 | Apr 1982 | JP |
57-073817 | May 1982 | JP |
57-073818 | May 1982 | JP |
57-073820 | May 1982 | JP |
57-083632 | May 1982 | JP |
57-093627 | Jun 1982 | JP |
57-105537 | Jul 1982 | JP |
57-113922 | Jul 1982 | JP |
57-113944 | Jul 1982 | JP |
57-151019 | Sep 1982 | JP |
57-171027 | Oct 1982 | JP |
57-181931 | Nov 1982 | JP |
57-183512 | Nov 1982 | JP |
57-191421 | Nov 1982 | JP |
57-203822 | Dec 1982 | JP |
58-044221 | Mar 1983 | JP |
58-053655 | Mar 1983 | JP |
58-057023 | Apr 1983 | JP |
58-082038 | May 1983 | JP |
58-128925 | Aug 1983 | JP |
58-170628 | Oct 1983 | JP |
58-185927 | Oct 1983 | JP |
58-185929 | Oct 1983 | JP |
58-185930 | Oct 1983 | JP |
58-185931 | Oct 1983 | JP |
58-185932 | Oct 1983 | JP |
58-192924 | Nov 1983 | JP |
58-194695 | Nov 1983 | JP |
59-018228 | Jan 1984 | JP |
59-053229 | Mar 1984 | JP |
59-176419 | Oct 1984 | JP |
59-201932 | Nov 1984 | JP |
59-220492 | Dec 1984 | JP |
60-119328 | Jun 1985 | JP |
60-150445 | Aug 1985 | JP |
60-240522 | Nov 1985 | JP |
60-240523 | Nov 1985 | JP |
60-240524 | Nov 1985 | JP |
60-240525 | Nov 1985 | JP |
61-126324 | Jun 1986 | JP |
61-126325 | Jun 1986 | JP |
61-215123 | Sep 1986 | JP |
61-237824 | Oct 1986 | JP |
62-060926 | Mar 1987 | JP |
62258130 | Nov 1987 | JP |
01-119421 | May 1989 | JP |
01-182560 | Jul 1989 | JP |
01-211615 | Aug 1989 | JP |
01-229786 | Sep 1989 | JP |
01-232112 | Sep 1989 | JP |
01-232113 | Sep 1989 | JP |
01-232115 | Sep 1989 | JP |
01-232116 | Sep 1989 | JP |
01-232118 | Sep 1989 | JP |
01-301917 | Dec 1989 | JP |
01-301918 | Dec 1989 | JP |
01-301919 | Dec 1989 | JP |
01-313624 | Dec 1989 | JP |
02-006289 | Jan 1990 | JP |
02-016327 | Jan 1990 | JP |
02-024282 | Jan 1990 | JP |
02-024283 | Jan 1990 | JP |
02-024284 | Jan 1990 | JP |
02-070920 | Mar 1990 | JP |
02-119636 | May 1990 | JP |
02-175491 | Jul 1990 | JP |
02-188624 | Jul 1990 | JP |
02-201026 | Aug 1990 | JP |
02-294520 | Dec 1990 | JP |
03-021584 | Jan 1991 | JP |
03-023317 | Jan 1991 | JP |
03-047425 | Feb 1991 | JP |
03-168352 | Jul 1991 | JP |
03-179152 | Aug 1991 | JP |
03-182626 | Aug 1991 | JP |
03-182635 | Aug 1991 | JP |
03-260368 | Nov 1991 | JP |
03-281939 | Dec 1991 | JP |
04-081325 | Mar 1992 | JP |
04-183933 | Jun 1992 | JP |
04-203317 | Jul 1992 | JP |
07-311626 | Nov 1992 | JP |
05-141260 | Jun 1993 | JP |
05-141262 | Jun 1993 | JP |
05-332188 | Dec 1993 | JP |
06-093869 | Apr 1994 | JP |
06-212986 | Aug 1994 | JP |
07-026946 | Jan 1995 | JP |
07-091264 | Apr 1995 | JP |
07-145730 | Jun 1995 | JP |
07-151006 | Jun 1995 | JP |
07-317545 | Dec 1995 | JP |
07-317555 | Dec 1995 | JP |
07-317556 | Dec 1995 | JP |
07-317557 | Dec 1995 | JP |
08-028280 | Jan 1996 | JP |
08-028285 | Jan 1996 | JP |
08-104286 | Apr 1996 | JP |
08-104295 | Apr 1996 | JP |
08-114122 | May 1996 | JP |
08-114123 | May 1996 | JP |
08-114124 | May 1996 | JP |
08-114125 | May 1996 | JP |
08-151926 | Jun 1996 | JP |
08-151965 | Jun 1996 | JP |
08-296449 | Dec 1996 | JP |
08-319840 | Dec 1996 | JP |
08-319901 | Dec 1996 | JP |
09-184426 | Jul 1997 | JP |
09-287465 | Nov 1997 | JP |
09-287467 | Nov 1997 | JP |
09-287470 | Nov 1997 | JP |
09-287471 | Nov 1997 | JP |
09-287472 | Nov 1997 | JP |
09-287475 | Nov 1997 | JP |
09-287486 | Nov 1997 | JP |
10-008973 | Jan 1998 | JP |
10-008974 | Jan 1998 | JP |
10-089079 | Apr 1998 | JP |
10-131818 | May 1998 | JP |
10-299525 | Nov 1998 | JP |
11-099992 | Apr 1999 | JP |
2000-038968 | Feb 2000 | JP |
3060489 | Apr 2000 | JP |
2001-082160 | Mar 2001 | JP |
2001-098960 | Apr 2001 | JP |
2001-233276 | Aug 2001 | JP |
2001-233277 | Aug 2001 | JP |
2001-263076 | Sep 2001 | JP |
2001-280144 | Oct 2001 | JP |
2001-323819 | Nov 2001 | JP |
2003-027952 | Jan 2003 | JP |
2003-049654 | Feb 2003 | JP |
2003-074445 | Mar 2003 | JP |
2006-083713 | Mar 2006 | JP |
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20070079796 A1 | Apr 2007 | US |