Classifications

• • 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
  • F02B77/00—Component parts, details or accessories, not otherwise provided for
  • F02B77/11—Thermal or acoustic insulation
  • F02B77/13—Acoustic insulation

Definitions

• This disclosure relates to a fixing structure for an insulator fixed to an engine body.
• Insulators for reducing engine combustion noise have been known for some time. Such insulators are fixed to the engine body by passing bolts through the insulator.
• a fixing structure that uses bolts to fix an insulator requires an increased number of bolts to secure the insulator. This increases the number of parts and the amount of work required to fix the insulator.
• the objective of this disclosure is to provide an insulator fixing structure that can fix an insulator without having to penetrate a fastener such as a bolt into the insulator.
• the insulator fixing structure disclosed herein comprises an engine body, a first part fixed to the engine body by a plurality of attachment points, and an insulator sandwiched and fixed between the first part and the engine body, the insulator having a base and a foam body arranged in close contact with the base, the base being arranged between the plurality of attachment points.
• This insulator fixing structure allows the insulator to be fixed without having to penetrate the insulator with fasteners such as bolts. This reduces the number of parts and allows the insulator to be fixed efficiently.
• FIG. 1 illustrates an insulator according to an embodiment of the present disclosure in a fixed state.
• 2 illustrates a first insulator according to an embodiment of the present disclosure.
• FIG. 10 illustrates a second insulator according to an embodiment of the present disclosure.
• FIG. 2 is a cross-sectional view taken along line II of FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1;
• the fixing structure 1 for the insulator 10 includes an engine body 2, an exhaust gas recirculation cooling device (an example of a first part) 4, an engine support bracket (an example of a first part) 6, a flange (an example of a second part) 8a, a bracket (an example of a second part) 8b, the insulator 10, and a harness bracket (an example of a third part) 20.
• the engine body 2 includes cylinders in which the air-fuel mixture is burned, generating combustion noise.
• the engine body 2 is a cylinder block.
• Figure 1 shows the cylinder block as viewed from the side, with the engine crankshaft (not shown) extending in the longitudinal direction of the engine body 2.
• the front side is labeled F
• the rear side is B
• the right side is R
• the left side is L
• the top side is U
• the bottom side is D.
• the exhaust gas recirculation cooling device 4, engine support bracket 6, flange 8a, and bracket 8b are components that are fixed to the engine body 2 with fasteners such as bolts.
• the exhaust gas recirculation cooling device 4 is a device that cools the exhaust gas recirculation device.
• the engine support bracket 6 is a device for fixing the engine body 2 to the vehicle.
• the flange 8a is the flange portion of the water pipe.
• the bracket 8b is a bracket for fixing the air conditioning compressor.
• the exhaust gas recirculation cooling device 4 and engine support bracket 6 are fixed to the engine body 2 at multiple attachment points.
• the exhaust gas recirculation cooling device 4 is fixed to at least two points, boss 2a and boss 2b, extending from the engine body 2.
• the engine support bracket 6 is fixed to at least two points, boss 2c and boss 2d, extending from the engine body 2.
• the insulator 10 is a component used to attenuate engine combustion noise.
• the insulator 10 is sandwiched and fixed between the exhaust gas recirculation cooling device 4, engine support bracket 6, flange 8a, and bracket 8b and the engine body 2.
• the insulator 10 has a first insulator 10a and a second insulator 10b arranged below the first insulator 10a.
• the insulator 10 has a base 12 and a foam 14 that is arranged in close contact with the base 12.
• the foam 14 is arranged to cover at least a portion of the periphery of the base 12.
• the first insulator 10a has a first base 13 and a first foam 14a that is arranged in close contact with the first base 13.
• the second insulator 10b has a second base 16 and a second foam 14b that is arranged in close contact with the second base 16.
• first base 13 and the second base 16 are plate-shaped resin plates.
• first base 13 and the second base 16 may also be metal plates, etc.
• the first foam 14a and the second foam 14b are urethane foam.
• the first insulator 10a and the second insulator 10b are formed by foaming and hardening the foam 14 on the base 12.
• the first base 13 has a first through hole 13a and multiple recesses 13b.
• the first through hole 13a functions as a hole through which the first foam 14a in liquid state passes during the manufacturing of the first insulator 10a, allowing the first foam 14a to flow from the surface of the first base 13 facing the engine body 2 to the surface facing the exhaust recirculation cooling device 4.
• the first through hole 13a also moderately weakens the rigidity of the first base 13, reducing the possibility of creaking caused by vibration of the first base 13 when fixed to the engine body 2, as well as the possibility of damage to the first base 13 due to creaking.
• the first base 13 is disposed between the bosses 2a and 2b when fixed to the engine body 2.
• the first insulator 10a is tightly sandwiched between the exhaust gas recirculation cooling device 4 and the engine body 2.
• the first insulator 10a is sandwiched and fixed between the engine body 2 and the exhaust gas recirculation cooling device 4. This reduces the number of parts, such as bolts, required to fix the first insulator 10a.
• the first insulator 10a can also be fixed when the exhaust gas recirculation cooling device 4 is fixed, work efficiency is improved.
• the first through-hole 13a is provided in the first insulator 10a at a location located between the exhaust gas recirculation cooling device 4 and the engine body 2. In other words, a location where the first base 13 is not present is provided in the first insulator 10a at a location located between the exhaust gas recirculation cooling device 4 and the engine body 2.
• the first foam 14a extends on the surface of the first insulator 10a facing the exhaust gas recirculation cooling device 4 at the portion that is sandwiched between the exhaust gas recirculation cooling device 4 and the engine body 2. This prevents damage to the exhaust gas recirculation cooling device 4 when the first insulator 10a is sandwiched.
• the recess 13b is shaped to fit the bosses 2a and 2b.
• the recess 13b can be positioned by fitting it into the bosses 2a and 2b.
• the bosses 2a and 2b are aligned in the front-to-rear direction and protrude cylindrically in the left-to-right direction from the engine body 2.
• the first base 13 extends between the bosses 2a and 2b, and the recess 13b is recessed in the front-to-rear direction along the circumferential shape of the bosses 2a and 2b.
• the first foam 14a around the recess 13b is also recessed in the front-to-rear direction along the circumferential shape of the bosses 2a and 2b, and the first foam 14a extends above and below the bosses 2a and 2b.
• the first insulator 10a is fixed by being sandwiched between the engine body 2 and the first flange 8a in an area other than the area where the first base 13 extends. In this way, there is no first base 13 between the flange 8a and the engine body 2, and the first foam 14a is sandwiched and fixed, making it possible to make fine positional adjustments when installing the first insulator 10a.
• the portion of the first insulator 10a that is sandwiched between the engine body 2 and the first flange 8a is preferably located at the end of the first insulator 10a.
• the second base 16 has a second through hole 16a and a recess 16b.
• the second through hole 16a functions as a hole through which the second foam 14b in liquid state passes during the manufacture of the second insulator 10b, allowing the second foam 14b to flow from the surface of the second base 16 facing the engine main body 2 to the surface facing the engine support bracket 6.
• the second through hole 16a also moderately weakens the rigidity of the second base 16, reducing the possibility of creaking caused by vibration of the second base 16 when fixed to the engine main body 2, as well as the possibility of damage to the second base 16 due to creaking.
• the second base 16 is positioned between bosses 2c and 2d when fixed to the engine body 2.
• the second insulator 10b is tightly sandwiched between the engine support bracket 6 and the engine body 2.
• the second insulator 10b is sandwiched and fixed between the engine body 2 and the engine support bracket 6.
• the second through hole 16a is provided in the second insulator 10b at a location located between the engine support bracket 6 and the engine body 2. In other words, a location where the second base 16 is not present is provided in the second insulator 10b at a location located between the engine support bracket 6 and the engine body 2.
• the second foam 14b extends from the surface of the second insulator 10b facing the engine support bracket 6 at the portion of the second insulator 10b that is sandwiched between the engine support bracket 6 and the engine body 2. This prevents damage to the engine support bracket 6 when the second insulator 10b is sandwiched.
• recess 16b is shaped to fit along boss 2e.
• second base 16 has multiple recesses 16c and 16d.
• Recess 16c is shaped to fit along boss 2f.
• Recess 16d is shaped to fit along boss 2g. This makes positioning of second insulator 10b even easier.
• boss 2c and boss 2d are arranged side by side in the vertical direction, and boss 2f and boss 2g are arranged side by side in the front-to-rear direction.
• boss 2c, boss 2d, boss 2f, and boss 2g protrude cylindrically in the left-to-right direction from engine body 2, and boss 2e protrudes in the left-to-right direction from engine body 2 below boss 2g in the shape of a rectangular prism.
• the second base portion 16 extends between bosses 2c and 2d, between bosses 2f and 2g, and between bosses 2g and 2e.
• the recess 16d corresponding to boss 2c is recessed downward along the circumferential shape of boss 2c
• the recess 16d corresponding to boss 2e is recessed upward along the circumferential shape of boss 2e
• the recesses corresponding to bosses 2f and 2g are recessed downward along the circumferential shape of bosses 2f and 2g.
• the second insulator 10b is sandwiched and fixed between the engine body 2 and bracket 8b in an area other than the area where the second base 16 extends. In this way, there is no second base 16 between the bracket 8b and the engine body 2, and the second foam 14b is sandwiched and fixed, making it possible to make fine positional adjustments when attaching the second insulator 10b.
• the portion of the second insulator 10b that is sandwiched between the engine body 2 and bracket 8b is preferably located at the end of the second insulator 10b.
• the fixing structure 1 for the insulator 10 further includes an overlapping region 18 where the first insulator 10a and the second insulator 10b overlap.
• the first base 13 of the first insulator 10a extends downward to the overlapping region 18.
• the second base 16 of the second insulator 10b extends upward to the overlapping region 18.
• the first base 13 and the second base 16 do not extend to a position where they overlap each other.
• the portion of the first base 13 that extends to the overlapping region 18 is shifted in the front-to-rear direction from the portion of the second base 16 that extends to the overlapping region 18.
• the second foam 14b is positioned so as to cover the portion of the first base 13 that extends to the overlapping region 18 from the side opposite the engine body 2, and the portion of the second base 16 that extends to the overlapping region 18 is positioned so as to cover the first foam 14a from the side opposite the engine body 2.
• the overlapping region 18 is sandwiched between the harness bracket 20 attached to the boss 2h and the engine body 2. In this way, the first base portion 13 and the second base portion 16 do not overlap, thereby suppressing resonance between the first base portion 13 and the second base portion 16.
• the present disclosure provides an insulator 10 fixing structure 1 that can fix the insulator 10 without using fasteners such as bolts.
• the first component is described using the exhaust gas recirculation cooling device 4 and the engine support bracket 6 as examples, but the present disclosure is not limited to these.
• the first component is not limited to these components, and may be any component that is fixed to the engine main body 2.
• the flange 8a and bracket 8b are used as examples of the second component, but the present disclosure is not limited to these.
• the second component is not limited to these components and may be any component that can be fixed to the engine body 2.
• Fixing structure 2 Engine body 2a, 2b, 2c, 2d, 2e, 2f, 2g: Boss 4: Exhaust gas recirculation cooling device (an example of a first component) 6: Engine support bracket (an example of the first part) 8a: flange (an example of the second part), 8b: bracket (an example of the second part) 10: Insulator 10a: First insulator, 10b: Second insulator 12: Base 13: First base, 13a: First through hole, 13b: Recess 14: Foam, 14a: First foam, 14b: Second foam 16: Second base, 16a: Second through hole 16b, 16c, 16d: Recess 18: Overlapping region

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Connection Of Plates (AREA)

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Citations (3)

• 2024
  • 2024-12-06 WO PCT/JP2024/043276 patent/WO2025158800A1/ja active Pending
  • 2024-12-06 JP JP2025571922A patent/JPWO2025158800A1/ja active Pending

Patent Citations (3)

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