WO2020183687A1 - 内燃機関 - Google Patents
内燃機関 Download PDFInfo
- Publication number
- WO2020183687A1 WO2020183687A1 PCT/JP2019/010475 JP2019010475W WO2020183687A1 WO 2020183687 A1 WO2020183687 A1 WO 2020183687A1 JP 2019010475 W JP2019010475 W JP 2019010475W WO 2020183687 A1 WO2020183687 A1 WO 2020183687A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- combustion engine
- internal combustion
- vehicle body
- mount portion
- crankshaft
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
- B60K5/12—Arrangement of engine supports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
- F02F7/0073—Adaptations for fitting the engine, e.g. front-plates or bell-housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
- F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
- F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
- F02F7/0073—Adaptations for fitting the engine, e.g. front-plates or bell-housings
- F02F2007/0075—Front covers
Definitions
- the present invention relates to an internal combustion engine.
- Patent Document 1 discloses a configuration in which a metal internal combustion engine side mount bracket for attaching an internal combustion engine to a vehicle body is fastened to a metal timing chain cover that covers the front surface of the internal combustion engine.
- the internal combustion engine is attached to the vehicle body by fastening the vehicle body side mount bracket fixed to the vehicle body and the internal combustion engine side mount bracket fixed to the internal combustion engine via a timing chain cover.
- Patent Document 1 there is room for further improvement in reducing the weight of the internal combustion engine and the number of parts of the internal combustion engine.
- the internal combustion engine of the present invention has a cylinder block in the axial direction of the crankshaft and a resin front cover arranged so as to cover one end surface of the cylinder head.
- the front cover is made of a resin material, and a mount portion for mounting the internal combustion engine to the vehicle body is integrally formed.
- a resin mount portion for mounting an internal combustion engine on a vehicle body is integrally formed on a resin front cover. Therefore, when a separate iron mount bracket or the like is used from the front cover. In comparison, the weight of the internal combustion engine can be reduced and the number of parts can be reduced.
- FIG. 1 An explanatory view schematically showing a schematic configuration of an internal combustion engine to which the present invention is applied.
- a cross-sectional view taken along the line AA of FIG. A cross-sectional view taken along the line BB of FIG.
- Explanatory drawing which shows typically the front surface of the internal combustion engine with the front cover removed.
- the X-axis is the front-rear direction of the internal combustion engine 1 (crank shaft axis direction)
- the Y-axis is the left-right direction (width direction) of the internal combustion engine 1
- the Z-axis is the vertical direction of the internal combustion engine 1 (cylinder axis direction).
- FIG. 1 is an explanatory diagram schematically showing a schematic configuration of an internal combustion engine 1 to which the present invention is applied.
- the internal combustion engine 1 includes a cylinder head 2, a cylinder block 3 attached to the lower part of the cylinder head 2, an integrated cam bracket 4 attached to the upper part of the cylinder head 2, and oil attached to the lower part of the cylinder block 3. It is roughly composed of a pan upper 5, an oil pan lower 6 attached to the lower part of the oil pan upper 5, and a front cover 7 that covers the front surface of the internal combustion engine 1.
- the internal combustion engine 1 is mounted on a vehicle such as an automobile as a drive source or the like.
- Reference numeral 8 in FIG. 1 is a transmission connected to the rear end of the internal combustion engine 1.
- the cylinder head 2 is a cast product made of a metal material such as an aluminum alloy, and exhausts air from an intake port (not shown) that supplies intake air to a combustion chamber (not shown) or from a combustion chamber (not shown).
- An exhaust port (not shown) for exhaust is formed.
- the cylinder block 3 is a cast product made of a metal material such as an aluminum alloy, and a number of cylinders (not shown) corresponding to the number of cylinders are formed.
- the oil pan upper 5 is made of a metal material such as an aluminum alloy, and constitutes a crankcase (not shown) in which a crankshaft (not shown) is housed together with the cylinder block 3.
- the oil pan lower 6 is made of a resin material such as a synthetic resin and stores lubricating oil.
- the integrated cam bracket 4 is made of a metal material such as an aluminum alloy and rotatably supports two camshafts (not shown) together with the cylinder head 2.
- FIG. 2 is a perspective view of the integrated cam bracket 4.
- the integrated cam bracket 4 shown in FIG. 2 is applied when the internal combustion engine 1 has four cylinders.
- the integrated cam bracket 4 connects the two side frames 11 and 11, the rectangular plate-shaped front frame 12 that connects the front ends of both side frames 11 and 11, and the rear ends of both side frames 11 and 11. It has a rear frame 13, a plurality of bearing beams 14, a central center beam 15, sub-center beams 16 and 17 on both sides, and a side wall 18 at one end protruding upward from the front frame 12.
- Each bearing beam 14 rotatably sandwiches two camshafts together with a bearing holder (not shown) formed on the cylinder head 2.
- the bearing beam 14 is arranged so as to cross the center of each cylinder, for example.
- the center beam 15 extends along the cylinder row direction (crankshaft axis direction) and spans the two bearing beams 14 in the center.
- the sub-center beam 16 extends along the cylinder row direction (crankshaft axis direction) and is bridged between the bearing beam 14 adjacent to the front frame 12 and the front frame 12.
- the sub-center beam 17 extends along the cylinder row direction (crankshaft axis direction) and is bridged between the bearing beam 14 adjacent to the rear frame 13 and the rear frame 13.
- One end side wall 18 is located on one end side of the integrated cam bracket 4 in the crankshaft axial direction. That is, one end side wall 18 is located in front of the internal combustion engine 1 and faces the front cover 7.
- One end side wall 18 has a protruding portion 19 having a wedge-shaped cross section on the back side.
- the protruding portion 19 is formed so as to gradually become thicker toward the cylinder head side in the cylinder axis direction of the internal combustion engine 1. More specifically, the surface of the protruding portion 19 is inclined so as to gradually become thicker toward the cylinder head side in the cylinder axis direction of the internal combustion engine 1.
- the upper surface opening of the integrated cam bracket 4 is covered with, for example, a cylinder head cover (not shown) made of a synthetic resin molded product. As a result, the sealed state of the valve chamber in which the camshaft and the like are housed is ensured.
- the front cover 7 is made of a resin material such as synthetic resin, and is attached to the internal combustion engine body so as to cover the front surface of the internal combustion engine body. More specifically, the front cover 7 is attached to the front surface of the cylinder block 3, the front surface of the cylinder head 2, the front surface of the integrated cam bracket 4, and the front surface of the oil pan upper 5 by bolts (not shown). In other words, the front cover 7 is arranged so as to cover the end faces of the cylinder block 3 and the cylinder head 2 on one end side in the axial direction of the crankshaft.
- the front cover 7 is a space formed between the front surface of the internal combustion engine main body and a crank sprocket (not shown) fixed to the front end of the crank shaft (not shown) or a cam shaft (not shown). Accommodates a cam sprocket (not shown) fixed to the front end. A timing chain (not shown) for transmitting rotational power is wound around these crank sprockets and cam sprockets.
- the front cover 7 has a mount portion 21 projecting to the front side of the internal combustion engine 1.
- the front side of the internal combustion engine 1 in the present specification is the right side in FIG. 1, the front side in the vertical direction of the paper surface in FIG. 3, and the left side in FIG. 7.
- FIG. 3 is a front view of the front cover 7.
- FIG. 4 is a rear view of the front cover 7.
- 5 and 6 are perspective views of the front cover 7.
- FIG. 7 is a cross-sectional view taken along the line AA of FIG.
- FIG. 8 is a cross-sectional view taken along the line BB of FIG.
- Reference numerals 22 in FIGS. 3 to 8 are crankshaft holes through which the crankshaft (not shown) penetrates the internal combustion engine 1.
- the mount portion 21 includes a vehicle body mounting portion 23 for mounting the internal combustion engine 1 to a vehicle body (not shown) on which the internal combustion engine 1 is mounted.
- the vehicle body mounting portion 23 is integrally formed with the mounting portion 21 as shown in FIGS. 3, 5 to 7.
- the vehicle body mounting portion 23 is fixed to the vehicle body side on which the internal combustion engine 1 is mounted.
- the mount portion 21 projects to the front side of the internal combustion engine 1 and is formed in an elongated hollow shape along the cylinder axis direction of the internal combustion engine 1. That is, the mount portion is formed so that the length along the cylinder axis direction of the internal combustion engine 1 is longer than the length along the width direction of the internal combustion engine 1 in the crankshaft axial direction.
- the mount portion 21 has a length along the cylinder axis direction of the internal combustion engine 1 longer than a length along the width direction of the internal combustion engine 1 in the crankshaft axial direction. It is formed.
- the cylinder axis direction of the internal combustion engine 1 is the vertical direction in FIG.
- the width direction of the internal combustion engine 1 in the axial direction of the crankshaft is the left-right direction in FIG.
- the vehicle body mounting portion 23 is formed on the cylinder head side of the mount portion 21 in the cylinder axis direction of the internal combustion engine 1. In other words, the vehicle body mounting portion 23 is formed above the mount portion 21 in the cylinder axis direction of the internal combustion engine 1.
- the mount portion 21 has a gentle outer shape (outer shape S) along the longitudinal direction of the mount portion 21 from the vehicle body mounting portion 23 to the lower end of the mount portion 21 without causing a step. It is formed to be continuous.
- the mount portion 21 has a predetermined curvature (for example, 0.) in which the outer shape (outer shape S) along the cylinder axis direction of the internal combustion engine 1 from the vehicle body mounting portion 23 to the lower end of the mount portion 21 is convex outward. It has 5) and is formed so as to be gently continuous.
- the mount portion 21 is the longitudinal direction of the mount portion 21 from the vehicle body mounting portion 23 to the lower end of the mount portion 21 located on the crankshaft side of the internal combustion engine 1 in the cylinder axis direction of the internal combustion engine 1 with respect to the vehicle body mounting portion 23.
- the outer shape (outer shape S) along the above side has a predetermined curvature (for example, 0.5), is convex outward, and is formed in a gently continuous curved shape.
- the mount portion 21 is formed so that the rate of change in cross section in the process from the vehicle body mounting portion 23 to the lower end of the mount portion 21 becomes small.
- the mount portion 21 has a smaller cross-sectional change rate from the vehicle body mounting portion 23 to the lower end of the mounting portion located on the crankshaft side of the internal combustion engine 1 in the cylinder axis direction of the internal combustion engine 1 than the vehicle body mounting portion 23. It is formed.
- the upper end side (upper side) of the mount portion 21 provided with the vehicle body mounting portion 23 projects forward of the internal combustion engine 1 from the lower end side (lower side). Is formed.
- the mount portion 21 is formed so that the amount of protrusion of the upper end portion (upper portion) of the vehicle body mounting portion 23 to the front of the internal combustion engine 1 is substantially constant.
- the mount portion 21 is formed so that the amount of protrusion toward the front of the internal combustion engine 1 decreases toward the lower end side (lower side).
- the mount portion 21 is formed so that the amount of protrusion of the central portion 25 toward the vehicle front side in the width direction of the internal combustion engine 1 is relatively large. .. That is, as shown in FIGS. 3, 5, 6 and 8, the amount of protrusion of the central portion 25 of the internal combustion engine 1 in the width direction toward the vehicle front side of the mount portion 21 is in the width direction of the internal combustion engine 1. It is formed so as to be larger than the amount of protrusion of both sides toward the front of the vehicle.
- vertical ribs 27 are formed on the back side of the mount portion 21 so that the wall thickness of the central portion 25 becomes thicker. Further, as shown in FIGS. 4 and 8, the mount portion 21 is formed with horizontal ribs 28 on the back surface side. The horizontal rib 28 is formed below the boss portion 31h, which will be described later, so as to connect the vertical rib 27 and the outer peripheral edge of the mount portion 21 on the side where the auxiliary machinery of the internal combustion engine 1 is not attached.
- the mounting portion 21 has a relatively thick wall thickness at the position where the lateral rib 28 is formed.
- the front cover 7 has a plurality of (eight in this embodiment) boss portions 31 fixed to the internal combustion engine 1 on the outer peripheral edge of the mount portion 21. At the center of these boss portions 31, a through hole 32 into which a bolt (not shown) for fixing the outer peripheral edge of the mount portion 21 to the internal combustion engine main body is inserted is formed.
- Reference numerals 31a to 31h in FIGS. 3 and 4 are boss portions provided on the outer peripheral edge of the mount portion 21.
- Reference numerals 32a to 32h in FIGS. 3 and 4 are through holes provided in the boss portion 31.
- a plurality of through holes are formed on the outer peripheral edge of the front cover 7. Bolts (not shown) for fixing the front cover 7 to the internal combustion engine 1 are inserted into these through holes (not shown).
- the boss portion 31 is fixed to the fastening point 33 set on the internal combustion engine main body side.
- These fastening points 33 are screw holes provided on the internal combustion engine main body side, and bolts (not shown) for fixing the outer peripheral edge of the mount portion 21 of the front cover 7 to the internal combustion engine 1 are inserted.
- the mount portion 21, the vehicle body mounting portion 23, the vertical rib 27, the horizontal rib 28, and the boss portion 31 are made of a resin material such as synthetic resin.
- FIG. 9 is an explanatory view schematically showing the front surface of the internal combustion engine 1 with the front cover 7 removed.
- Reference numerals 33A to 33H in FIG. 9 indicate fastening points of the boss portions 31a to 31h of the front cover 7.
- Reference numeral 34 in FIG. 9 is a ladder frame.
- the ladder frame 34 is made of a metal material such as an aluminum alloy, and is attached to the lower part of the cylinder block 3 by a plurality of bolts (not shown).
- the rudder frame 34 comprises a plurality of main bearing portions 35 that rotatably support a crankshaft (not shown) between the cylinder block 3 and the rudder frame 34. That is, the crankshaft is rotatably supported between the lower surface of the cylinder block 3 and the upper surface of the rudder frame 34.
- the boss portion 31a is fixed to the fastening point 33A set on the side wall 18 at one end of the integrated cam bracket 4. That is, one end side wall 18 of the integrated cam bracket 4 has a fastening point 33A for fixing the boss portion 31a.
- One end side wall 18 provided with the fastening point 33A has a protruding portion 19 on the back surface side to have high rigidity. Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31a is fixed to the fastening point 33A.
- the boss portion 31b is fixed to the fastening point 33B set on the cylinder head 2.
- the fastening point 33B is set on the side where the auxiliary machinery of the internal combustion engine 1 is attached in the axial direction of the crankshaft. That is, the cylinder head 2 has a fastening point 33B for fixing the boss portion 31b on the side where the auxiliary machinery (not shown) of the internal combustion engine 1 is attached in the axial direction of the crankshaft.
- the cylinder head 2 has a high rigidity on the side to which the auxiliary machinery (not shown) of the internal combustion engine 1 is attached. Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31b is fixed to the fastening point 33B.
- the boss portion 31c is fixed to the fastening point 33C set in the cylinder head 2.
- the fastening point 33C is set on the side to which the auxiliary machinery of the internal combustion engine 1 is attached in the axial direction of the crankshaft. That is, the cylinder head 2 has a fastening point 33C for fixing the boss portion 31c on the side where the auxiliary machinery (not shown) of the internal combustion engine 1 is attached in the axial direction of the crankshaft.
- the cylinder head 2 has a high rigidity on the side to which the auxiliary machinery (not shown) of the internal combustion engine 1 is attached. Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31c is fixed to the fastening point 33C.
- the boss portion 31d is fixed to the fastening point 33D set in the cylinder block 3.
- the fastening point 33D is set on the side where the auxiliary machinery of the internal combustion engine 1 is attached in the axial direction of the crankshaft. That is, the cylinder block 3 has a fastening point 33D for fixing the boss portion 31d on the side where the auxiliary machinery (not shown) of the internal combustion engine 1 is attached in the axial direction of the crankshaft.
- the cylinder block 3 has a high rigidity on the side to which the auxiliary machinery (not shown) of the internal combustion engine 1 is attached. Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31d is fixed to the fastening point 33D.
- the boss portion 31e is fixed to the fastening point 33E set in the cylinder block 3.
- the fastening point 33E is set on the side to which the auxiliary machinery of the internal combustion engine 1 is attached in the axial direction of the crankshaft. That is, the cylinder block 3 has a fastening point 33E for fixing the boss portion 31e on the side where the auxiliary machinery (not shown) of the internal combustion engine 1 is attached in the axial direction of the crankshaft.
- the fastening point 33E is provided on the crankshaft support portion 36 of the cylinder block 3 that supports the crankshaft (not shown) of the internal combustion engine 1.
- the cylinder block 3 has a high rigidity on the side to which the auxiliary machinery (not shown) of the internal combustion engine 1 is attached.
- crankshaft support portion 36 of the cylinder block 3 has high rigidity in order to support the crankshaft (not shown). Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31e is fixed to the fastening point 33E.
- the boss portion 31f is fixed to the fastening point 33F set on the side wall 18 at one end of the integrated cam bracket 4. That is, one end side wall 18 of the integrated cam bracket 4 has a fastening point 33F for fixing the boss portion 31f.
- One end side wall 18 provided with the fastening point 33F has a protruding portion 19 on the back surface side to have high rigidity. Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31f is fixed to the fastening point 33F.
- the boss portion 31g is fixed to a fastening point 33G set on one end side wall 18 of the integrated cam bracket 4. That is, one end side wall 18 of the integrated cam bracket 4 has a fastening point 33G for fixing the boss portion 31g.
- One end side wall 18 provided with the fastening point 33G has a protruding portion 19 on the back surface side to have high rigidity. Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31 g is fixed to the fastening point 33 G.
- the boss portion 31h is fixed to the fastening point 33H set in the sand dropping portion having high rigidity even in the cylinder head 2. That is, the cylinder head 2 has a fastening point 33H for fixing the boss portion 31h in the highly rigid sand removing portion. Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31h is fixed to the fastening point 33H.
- the lower end of the mount portion 21 located on the crankshaft side (lower side in FIG. 3) of the internal combustion engine 1 in the cylinder axis direction of the internal combustion engine 1 with respect to the vehicle body mounting portion 23 is formed so as to be continuous with the boss portion 31e. There is. Therefore, the front cover 7 can improve the rigidity of the mount portion 21 when the boss portion 31e is fixed to the fastening point 33E.
- the front cover 7 has three load path portions 41 whose rigidity is continuously strengthened linearly along the longitudinal direction of the mount portion 21 for load transmission.
- the load path portion 41 is a portion in which the wall thickness or the like is thicker than the other portions of the mount portion 21 to enhance the rigidity.
- the load path portion 41 is made of a resin material such as a synthetic resin.
- the load path portion 41a is a portion that constitutes the outer peripheral edge of the mount portion 21, and is formed on the side to which the accessories of the internal combustion engine 1 are attached.
- the load path portion 41a is formed so that the lower end located on the crankshaft side of the internal combustion engine 1 in the cylinder axis direction of the internal combustion engine 1 overlaps with the crankshaft support portion 36 of the cylinder block 3.
- Boss portions 31a to 31e are formed in the load path portion 41a.
- the position of the upper end of the load path portion 41a substantially coincides with the upper end of the mount portion 21 located on the cylinder head side in the cylinder axis direction of the internal combustion engine 1.
- a boss portion 31e is formed at the lower end located on the crankshaft side of the internal combustion engine 1 in the cylinder axis direction of the internal combustion engine 1.
- the load path portion 41b is a portion of a vertical rib 27 formed in the center of the mount portion 21.
- the position of the upper end of the load path portion 41b substantially coincides with the upper end of the mount portion 21 located on the cylinder head side in the cylinder axis direction of the internal combustion engine 1.
- the lower end of the load path portion 41b located on the crankshaft side of the internal combustion engine 1 in the cylinder axis direction of the internal combustion engine 1 is connected to the load path portion 41a.
- a boss portion 31f is formed in the load path portion 41b.
- the load path portion 41c is composed of a part of the outer peripheral edge of the mount portion 21 on the side where the auxiliary machinery of the internal combustion engine 1 is not attached and the lateral rib 28.
- the position of the upper end of the load path portion 41c substantially coincides with the upper end of the mount portion 21 located on the cylinder head side in the cylinder axis direction of the internal combustion engine 1.
- the lower end of the load path portion 41c located on the crankshaft side of the internal combustion engine 1 in the cylinder axis direction of the internal combustion engine 1 is connected to the load path portion 41b.
- Boss portions 31g and 31h are formed in the load path portion 41c.
- the boss portion 31 of the front cover 7 is formed in the load path portion 41. Further, the load path portion 41 is formed so that the lower end thereof overlaps with the crankshaft support portion 36 of the cylinder block 3 when the front cover 7 is attached to the cylinder block 3.
- the internal combustion engine 1 can receive the load input from the vehicle body mounting portion 23 to the mount portion 21 by the load path portion 41 at the crankshaft support portion 36 of the cylinder block 3 having high rigidity.
- the front cover 7 of the above-described embodiment is integrally formed with a mount portion 21 made of a resin material and having a vehicle body mounting portion 23 for mounting the internal combustion engine 1 to the vehicle body. Therefore, the internal combustion engine 1 can be made lighter and the number of parts can be reduced as compared with the case where the internal combustion engine 1 is fixed to the vehicle body side by using an iron mount bracket or the like separate from the front cover.
- the mount portion 21 Since the outer shape (outer shape S) of the mount portion 21 along the longitudinal direction of the mount portion 21 from the vehicle body mounting portion 23 to the lower end of the mount portion 21 has a predetermined curvature and is gently continuous, stress is applied. It is less likely to occur. Therefore, the mount portion 21 can receive the load input from the vehicle body mounting portion 23 as a whole, and the rigidity can be improved.
- the mount portion 21 can receive the load input from the vehicle body mounting portion 23 as a whole in this respect as well, and the rigidity can be improved.
- the mount portion 21 is formed when the boss portion 31 is fixed to the fastening point 33.
- the rigidity of the can be improved.
- the lower end of the load path portion 41 with enhanced rigidity is fixed to the crankshaft support portion 36 of the highly rigid cylinder block 3, so that the boss portion 31 is also fixed to the fastening point 33 at this point as well. At that time, the rigidity of the mount portion 21 can be improved.
- the present invention is not limited to the above-mentioned examples, and various modifications can be made without departing from the spirit of the present invention.
- the number of boss portions 31 and the number of load path portions 41 are not limited to the number of the above-described examples, and may be larger or smaller than the number of the above-mentioned examples. Is.
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Abstract
Description
Claims (14)
- クランクシャフト軸線方向におけるシリンダブロック及びシリンダヘッドの一端側の端面を覆うように配置された樹脂製のフロントカバーを有する内燃機関であって、
上記フロントカバーには、樹脂材料からなり、当該内燃機関を車体に対して取り付けるためのマウント部が一体に形成されている内燃機関。 - 上記マウント部は、当該内燃機関の前方側へ突出し、当該内燃機関のシリンダ軸線方向に沿って細長い中空形状に形成されている請求項1に記載の内燃機関。
- 上記マウント部には、車体に対して取り付けられる車体取り付け部が一体に形成され、
上記車体取り付け部は、当該内燃機関のシリンダ軸線方向で上記マウント部のシリンダヘッド側に形成され、
上記マウント部は、上記車体取り付け部から当該マウント部の下端に至る当該マウント部の長手方向に沿った外形状が所定の曲率を有して緩やかに連続するよう形成されている請求項2に記載の内燃機関。 - 上記マウント部には、車体に対して取り付けられる車体取り付け部が一体に形成され、
上記車体取り付け部は、当該内燃機関のシリンダ軸線方向で上記マウント部のシリンダヘッド側に形成され、
上記マウント部は、上記車体取り付け部から当該車体取り付け部よりも当該内燃機関のシリンダ軸線方向で当該内燃機関のクランクシャフト側に位置する当該マウント部の下端に至る過程での断面変化率が小さくなるよう形成されている請求項2または3に記載の内燃機関。 - 上記フロントカバーは、上記マウント部の外周縁に当該内燃機関に固定される複数のボス部を有する請求項1~4のいずれかに記載の内燃機関。
- 上記マウント部には、車体に対して取り付けられる車体取り付け部が一体に形成され、
上記車体取り付け部よりも当該内燃機関のシリンダ軸線方向で当該内燃機関のクランクシャフト側に位置する上記マウント部の下端は、上記ボス部と連続するよう形成されている請求項5に記載の内燃機関。 - 上記シリンダブロックは、上記ボス部を固定する留め点を有する請求項5または6に記載の内燃機関。
- 上記シリンダブロックは、当該内燃機関のクランクシャフトを支持するクランクシャフト支持部に上記ボス部を固定する留め点を有する請求項5~7のいずれかに記載の内燃機関。
- 上記シリンダブロックは、クランクシャフト軸方向視で、当該内燃機関の補機類が取り付けられる側の外周縁に上記ボス部を固定する留め点を有する請求項5~8のいずれかに記載の内燃機関。
- 上記フロントカバーは、荷重伝達用に上記マウント部の長手方向に沿って連続する剛性が強化されたロードパス部を有し、上記ボス部は当該ロードパス部に形成されている請求項5~9のいずれかに記載の内燃機関。
- 当該内燃機関のシリンダ軸線方向で当該内燃機関のクランクシャフト側に位置する上記ロードパス部の下端は、上記ボス部によって当該内燃機関のクランクシャフトを支持する上記シリンダブロックのクランクシャフト支持部に固定されている請求項10に記載の内燃機関。
- 上記シリンダヘッドは、上記ボス部を固定する留め点を有する請求項5~11のいずれかに記載の内燃機関。
- 当該内燃機関のカムシャフトを支持するカムブラケットを有し、
上記カムブラケットは、上記フロントカバーと対向する一端側壁に上記ボス部を固定する留め点を有する請求項5~12のいずれかに記載の内燃機関。 - 上記一端側壁は、背面側に断面楔形状となる突出部を有し、
上記突出部は、当該内燃機関のシリンダ軸線方向のシリンダヘッド側に向かって徐々に厚肉となるように形成されている請求項13に記載の内燃機関。
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US17/438,541 US11623506B2 (en) | 2019-03-14 | 2019-03-14 | Internal combustion engine |
EP19918509.1A EP3939817A4 (en) | 2019-03-14 | 2019-03-14 | COMBUSTION ENGINE |
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