Abstract not available for ES 2334512 (T3) Abstract of corresponding document: EP 1813804 (A1) Translate this text To effectively reduce operation noise generated by vibration of the fuel injection valve(44) with a fuel injection valve installation structure of an engine. In the structure, an installation hole (45) is formed in an engine component member (13F, 13R) that constitutes a part of an engine. The installation hole (45) has an annular shoulder portion (45c), which is formed in the middle portion thereof, and which faces the exterior side. The fuel injection valve (44) is held between the annular shoulder portion (45c) and a supporting member' (46) attached to the engine component member. First damper means (47) with high vibration-damping properties is set between an annular shoulder portion (45c) and a fuel injection valve (44), and second damper means (48) with high vibration-damping quality is set between a supporting member (46) and the fuel injection valve (44).
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[0002] A type of four-cycle direct injection engine is disclosed in, for example, Patent Document 1, and has been known. The type of engine has an installation hole formed in a cylinder head. An air injector as a fuel injection valve is held between a supporting member attached to the cylinder head and an annular shoulder portion formed in the middle portion of the installation hole. [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-116447 .
[0003] In the structure disclosed in Patent Document 1 mentioned above, the air injector is directly held between the cylinder head and a head cover, and thus the vibration produced at the time of injection is emitted from the engine body to the outside. When the kind of engine is mounted on a vehicle, some kind of countermeasure, such as a sound insulation cover is needed to deal with the emitted noise. Particularly in a motorcycle, however, such a sound insulation cover directly affects the appearance, and also affects the cooling capability of the engine itself. These problems must be taken care of. As a result, the structure becomes more complex, and the cost becomes higher than otherwise.
[0009] The invention as recited in claim 5 has the following characteristics, in addition to the configuration as recited in any one of claims 1 to 4. The fuel injection valve is an air injector that is slidably fitted into a valve-holding member, which is located at a fixed position to the engine component member. The rear end of the fuel injection valve is communicated with a pressurized air chamber that is formed in the valve-holding member.
[0016] According to the invention as recited in claim 5, while making the assembling operation easier, the noise related to the injection operation of the fuel injection valve and the accompanying pressure change in the pressurized air chamber, can be reduced.
[0017] According to the invention as recited in claim 6, the two stacked vibration-damping members effectively blocks the transfer of heat from the cylinder head to the fuel injection valve side. As a result, the temperature rise of the fuel injection valve can be curbed. [Fig. 1] Fig. 1 is a side view of an engine. [Fig. 2] Fig. 2 is a sectional view taken along line 2-2 of Fig. 1. [Fig. 3] Fig. 3 is an enlarged view of a portion indicated by arrow 3 in Fig. 2.
[0020] Firstly, in Fig. 1, an engine E is a four-cycle direct injection engine, which is mounted, for example, on a motor cycle. The engine E is a V-type engine and has a front bank BF and a rear bank BR, each of which is configured as a single cylinder.
[0027] Compressed air is supplied to the injector 40 by an air compressor 42 fixed, on the front side, to the front side wall of the cylinder block 12F. The air compressor 42 is driven by the driving force which is transmitted from the crankshaft.
[0028] A fuel injector 43 and an air injector 44 constitute the injector 40, while these injectors 43 and 44 are coaxially connected to each other. The fuel injector 43 is installed into the head cover 14F for the purpose of injecting the fuel. The air injector 44 is installed into the cylinder head 13F as an engine component member for the purpose of injecting the fuel as well as the compressed air directly into the combustion chamber 21. The air injector 44 has a nozzle 44a, which plunges into the combustion chamber 21, at a first of the two end portions. The air injector 44 also has a large-diameter portion 44b in the middle portion in the axial directions.
[0030] The air injector 44 is held between the annular shoulder portion 45c and a damper cover 46, which is a supporting member attached to the cylinder head 13F. A first damper means 47 with a high vibration-damping property, is set between the annular shoulder portion 45c and the air injector 44. A second damper means 48 with a high vibration-damping property, is set between the damper cover 46 and the air injector 44.
[0036] A second end portion of the air injector 44 is, hermetically and slidably, fitted into an injector holder 64, which is a valve-holding member located at a fixed position to the cylinder head 13F. A retaining hole 65, coaxial with the installation hole 45, is provided in the injector holder 64. The second end portion of the air injector 44 is, hermetically and slidably, fitted into a small-diameter-hole portion 65a of the injector holder 64. The small-diameter-hole portion 65a, an intermediate-diameter-hole portion 65b with a larger diameter than that of the small-diameter-hole portion 65a, and a large-diameter hole portion 65c with a larger diameter than that of the intermediate-diameter-hole portion 65b are coaxially and successively provided from the bottom up to form the retaining hole 65 . A tapered shoulder portion 65d is formed between the small-diameter-hole portion 65a and the intermediate-diameter-hole portion 65b. An annular shoulder portion 65e, facing the exterior side, is formed between the intermediate-diameter-hole portion 65b and the large-diameter-hole portion 65c.
[0041] A pressurized air chamber 75 is formed in the injector holder 64 and between the tip end portion of the fuel injector 43 and the rear end portion of the air injector 44. The second end, that is, the rear end, of the air injector 44 is communicated with the pressurized air chamber 75. The seal member 71 attached to the nozzle portion 43a, and a ring-shaped seal member 76 seal the pressurized air chamber 75 on the two axial sides thereof. The seal member 76 is attached to the outer circumference of the air injector 44 near the second end thereof, and is brought into contact with the inner circumference of the small-diameter-hole portion 65a of the retaining hole 65 by spring force.
[0042] A pressurized air route 77, which leads to the pressurized air chamber 75, is provided in the injector holder 64. As is shown in Fig. 2, a regulator 79 is attached to the cylinder head 13F with bolts 80.... The compressed air, ejected from the air compressor 42, is introduced into the regulator 79, and the regulator 79 adjusts the pressure of the compressed air. The compressed air thus adjusted is led through an air supply pipe 78. A first end of the air supply pipe 78 is hermetically connected to the regulator 79. The second end of the air supply pipe 78 is connected to the injector holder 64 allowing the pipe 78 and the pressurized air route 77 to communicate with each other hermetically.
[0043] The fuel supply structure in the rear bank BR shares the air compressor 42 with the fuel supply structure in the front bank BF. Except this, the structure in the rear bank BR is the same as that in the front bank BF. Thus, no detail explanation will be given as to the structure in the rear bank BR.
[0044] Explanations will follow as to the advantageous effects of this embodiment. Each of the cylinder heads 13F and 13R is provided with the installation hole 45, in the middle of which an annular shoulder portion 45c is formed to face the exterior side. The air injector 44, which is inserted into the installation hole 45, is held between the annular shoulder portion 45c and the damper cover 46. The damper cover 46 is attached to each of the cylinder heads 13F and 13R. In addition, the first damper means 47, with a high vibration-damping property, is set between the annular shoulder portion 45c and the air injector 44. Moreover, the second damper means 48, with a high vibration-damping property, is set between the damper cover 46 and the air injector 44.
[0045] In this way, the air injector 44 is floatingly supported, by the first and the second damper means 47 and 48, between the damper cover 46 and either of the cylinder heads 13F or 13R. As a result, the damper means 47 and 48 can curb the vibration generated in the air injector 44 that may otherwise be emitted out from each of the cylinder heads 13F and 13R. With this configuration, the operation noise due to the vibration of the air injector 44 can be effectively reduced.
[0046] In addition, the first damper means 47 is formed by stacking the two vibration-damping members 49 and 50, each one of which has a vibration-damping property different from that of the other. In this embodiment, four damping washers 49... made of a vibration-damping steel sheet, or of a vibration-damping alloy, and a wave washer 50 are stacked to constitute the first damper means 47. As a result, the first damper means 47 can have an excellent effect on the reduction of the operation noise. Besides, the temperature rise of the air injector 44 can be curbed by the first damper means 47, by effectively blocking the transfer of the heat from each of the cylinder heads 13F and 13R to the corresponding air injector 44 with the stacked damping washers 49... and the wave washer 50.
The EPO does not accept any responsibility for the accuracy of data and information originating from other authorities than the EPO; in particular, the EPO does not guarantee that they are complete, up-to-date or fit for specific purposes. Claims Tree Translate this text Claims not available for ES 2334512 (T3) Claims of corresponding document: EP 1813804 (A1) 1. A fuel injection valve installation structure of an engine, in which an installation hole (45) with an annular shoulder portion (45c) in the middle portion thereof, is formed in an engine component member (13F, 13R) that constitutes a part of the engine, and a fuel injection valve (44) that is inserted into the installation hole (45) is held between the annular shoulder portion (45c) and a supporting member (46) attached to the engine component member (13F, 13R), the fuel injection valve installation structure of an engine wherein first damper means (47) with a high vibration-damping property is set between the annular shoulder portion (45c) and the fuel injection valve (44), and second damper means (48) with a high vibration-damping property is set between the supporting member (46) and the fuel injection valve (44).
2. The fuel injection valve installation structure of an engine as recited in claim 1, wherein: the second damper means (48) has a damper holder (56) and a damper member (58), the damper holder (56) being brought into contact with the fuel injection valve (44) from the exterior side of the installation hole (45), and being supported by the supporting member (46) slidably in the axial directions of the installation hole (45), and the damper member (57) being held by the damper holder (56), and being set between the damper holder (56) and the supporting member (46); and a sliding member (58) is attached to the supporting member (46), and guides the sliding movement of the damper holder (56), in the axial directions of the installation hole (45), against the supporting member (46).
3. The fuel injection valve installation structure of an engine as recited in any of the preceding claims, wherein the first damper means (47) is formed by stacking two kinds of vibration-damping member (49, 50), each one of which has a different vibration-damping property from that of the other.
4. The fuel injection valve installation structure of an engine as recited in any of the preceding claims, wherein at least a part of the damper member (57) that the second damper means (48) has is made of a rubber (59), and the first damper means (47) has a wave washer (50) with a spring force being set to be lower than that of the rubber (59) .
5. The fuel injection valve installation structure of an engine as recited in any of claims 1 to 4, wherein the fuel injection valve (44) is an air injector that is slidably fitted into a valve-holding member (64), while the rear end of the fuel injection valve (44) is communicated with a pressurized air chamber (75) formed in the valve-holding member (64), which is located at a fixed position to the engine component member (13F, 13R).
6. The fuel injection valve installation structure of engine as recited in any of the preceding claims, wherein the engine component member (13F, 13R) is a cylinder head.
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