Air compressor, internal combustion engine assembly and vehicle

Abstract

An air compressor is provided with: a cylinder block having a crankcase and a cylinder section of a plurality of cylinders; a cylinder head covering the cylinder block; the crankshaft is supported in the crankcase; a piston that reciprocates in the cylinder section through the crankshaft, sucks in air, compresses the suctioned air, and discharges the compressed air; and a first rib which is provided on the outer wall of the cylinder block, extends in a direction in which the piston reciprocates, protrudes in a direction orthogonal to the direction in which the piston reciprocates, and suppresses vibration of the cylinder block.

Description

Technical Field

[0001] The present invention relates to an air compressor, an internal combustion engine assembly and a vehicle. Background Art

[0002] The air compressor is driven in conjunction with the internal combustion engine to store compressed air used for, for example, vehicle air brakes in an air tank.

[0003] When improving the discharge rate of compressed air of the air compressor, consider changing a single cylinder to a multi-cylinder. In this case, if the single-cylinder air compressor is simply changed to a multi-cylinder, then worry that the noise such as the gear rattling sound (rattle) and piston hitting sound of the air compressor will become larger. Summary of the Invention

[0004] An object of the present invention is to provide an air compressor, an internal combustion engine unit, and a vehicle that can suppress an increase in noise even when the engine has multiple cylinders.

[0005] According to one embodiment of the present invention, an air compressor comprises: a cylinder block having a crankcase and a cylinder portion having a plurality of cylinders; a cylinder head covering the cylinder block; a crankshaft supported in the crankcase; a piston which reciprocates in the cylinder portion via the crankshaft to inhale air and compress the inhaled air and discharge it; and a first rib provided on an outer wall of the cylinder block, extending in a direction along the direction of the reciprocating movement of the piston and protruding in a direction orthogonal to the direction of the reciprocating movement of the piston to suppress vibration of the cylinder block.

[0006] According to the present invention, it is possible to provide an air compressor, an internal combustion engine unit, and a vehicle that can suppress an increase in noise even when the engine has multiple cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram showing a vehicle including an internal combustion engine unit having an air compressor according to an embodiment and an internal combustion engine serving as a power source for driving the air compressor.

[0008] Figure 2 This is a schematic diagram showing the positional relationship between the internal combustion engine and the air compressor, and illustrating the arrangement of the power gear (crankshaft sprocket) of the internal combustion engine, the driven gear fixed to the crankshaft of the air compressor, and the idle gear between the power gear and the driven gear.

[0009] Figure 3 It is a schematic diagram showing an air compressor according to an embodiment.

[0010] Figure 4It is a schematic diagram showing a crankshaft arranged in a crankcase of an air compressor according to an embodiment.

[0011] Figure 5 It is a schematic diagram showing a cylinder block of an air compressor according to an embodiment.

[0012] Figure 6 It is a schematic diagram showing a rib provided on a cylinder block of an air compressor according to an embodiment and a comparative example of the rib.

[0013] Figure 7 It is a schematic diagram showing a state in which the air compressor according to the embodiment is mounted on an internal combustion engine.

[0014] Figure 8 The results of the analysis of the air compressor when vibration is applied in the vertical direction (horizontal axis: frequency (Hz), vertical axis: acceleration (m / s 2 ))'s graphics.

[0015] Figure 9A This is a diagram showing an example of the operation of the air compressor when the input frequency to the air compressor in the upward and downward directions is 575 Hz on the left and 585 Hz on the right.

[0016] Figure 9B This is a diagram showing an example of the operation of an air compressor in which the input frequencies in the upward and downward directions to the air compressor are 2178 Hz on the left and 2048 Hz on the right.

[0017] Figure 9C This is a diagram showing an example of the operation of an air compressor in which the input frequencies in the upward and downward directions to the air compressor are 2704 Hz on the left and 2557 Hz on the right.

[0018] Figure 10 The results of the analysis of the air compressor when vibration is applied in the left and right directions (horizontal axis: frequency (Hz), vertical axis: acceleration (m / s 2 ))'s graphics.

[0019] Figure 11A This is a diagram showing an example of the operation of an air compressor in which the input frequencies in the left and right directions to the air compressor are 406 Hz for the left and 394 Hz for the right.

[0020] Figure 11B This is a diagram showing an example of the operation of an air compressor in which the input frequencies in the left and right directions to the air compressor are 1906 Hz for the left and 1784 Hz for the right.

[0021] Figure 11CThis is a diagram showing an example of the operation of an air compressor in which the input frequencies in the left and right directions to the air compressor are 2178 Hz for the left and 2048 Hz for the right. DETAILED DESCRIPTION

[0022] Next, the air compressor 22 of the internal combustion engine unit 12 of the vehicle 10 according to the present embodiment will be described with reference to the drawings. The relative sizes of the components in the drawings are schematic and may differ from the actual sizes.

[0023] like Figure 1 As shown, the vehicle 10 includes an internal combustion engine assembly 12 having an air compressor 22 and an internal combustion engine 24 serving as a power source for driving the air compressor 22. An example of the vehicle 10 is a truck, a tractor, or the like.

[0024] The internal combustion engine 24 is, for example, a diesel engine.

[0025] like Figure 2 As shown, a driven gear 36 for fixing the crankshaft 46 of the air compressor 22 is arranged on a power gear 32 such as a crank sprocket of the internal combustion engine 24 via an idle gear 34 .

[0026] The idle gear 34 is used as an intermediate gear between the power gear 32 and the driven gear 36 .

[0027] The driven gear 36 is disposed between the idle gear 34 and the power gear 32 , and receives the rotational force of the power gear 32 via the idle gear 34 to rotate.

[0028] Figure 3 Although the illustrated air compressor 22 is described as having two cylinders in this embodiment, it may also have more cylinders, such as three or more cylinders.

[0029] The air compressor 22 includes: a cylinder block 42 having a crankcase 52 and a cylinder portion 54 of multiple cylinders; a cylinder head 44 covering the cylinder portion 54 of the cylinder block 42; a crankshaft 46 supported in the crankcase 52; and pistons 48a, 48b, which reciprocate in the cylinder portion 54 via the crankshaft 46, respectively, to inhale air from outside the air compressor 22 and compress the inhaled air to eject (discharge) it outside the air compressor 22.

[0030] The cylinder block 42 and the cylinder head 44 are each formed of, for example, cast iron.

[0031] An air intake port 44a and an air discharge port 44b are provided in the cylinder head 44. The air intake port 44a is formed as an opening for introducing air into the air compressor 22. An air receiver (not shown) is connected to the air discharge port 44b, and compressed air compressed by pistons 48a and 48b in the air compressor 22 is discharged from the air discharge port 44b and stored in the air receiver.

[0032] In this embodiment, the crankshaft 46 is used Figure 4 The structure shown.

[0033] The crankshaft 46 includes a main shaft 46a, a main journal 46b, a first crankpin 46c, a first counterweight 46d, a connecting portion 46e, a second crankpin 46f, and a second counterweight 46g.

[0034] The first crank pin 46c is disposed between the first counterweights 46d. The center axis of the first crank pin 46c is offset from the center axis of the main shaft 46a and the main journal 46b. The first crank pin 46c is connected to the first connecting rod 47a (see Figure 3 ) at one end.

[0035] The second crank pin 46f is disposed between the second counterweights 46g. The center axis of the second crank pin 46f is offset from the center axis of the main shaft 46a and the main journal 46b. The second crank pin 46f and the second connecting rod 47b (see Figure 3 ) at one end.

[0036] The center axis of the first crankpin 46 c and the center axis of the second crankpin 46 f are offset from the center axis of the main shaft 46 a and the main journal 46 b by, for example, 180°.

[0037] In the present embodiment, the central axis of the connecting portion 46e coincides with the central axes of the main shaft 46a and the main journal 46b.

[0038] exist Figure 5 The cylinder block 42 is shown in FIG.

[0039] Figure 5 The crankcase 52 shown is formed in a substantially cylindrical shape because the crankshaft 46 is rotated around the central axis of the main shaft 46 a and the main journal 46 b in the crankcase 52 .

[0040] The cylinder portion 54 is provided so as to protrude radially relative to the crankcase 52. The cylinder portion 54 includes a first cylindrical portion 62 and a second cylindrical portion 64 arranged along the axial direction of the crankshaft 46. The axial directions of the first cylindrical portion 62 and the axial directions of the second cylindrical portion 64 intersect the axial direction of the crankshaft 46. The axial directions of the first cylindrical portion 62 and the second cylindrical portion 64 are preferably parallel to each other.

[0041] like Figure 3As shown, the first piston 48a is disposed in the first cylinder portion 62, and the first connecting rod 47a is disposed between the crankshaft 46 and the first piston 48a. The second piston 48b is disposed in the second cylinder portion 64, and the second connecting rod 47b is disposed between the crankshaft 46 and the second piston 48b. Furthermore, it is preferable that the first piston 48a and the second piston 48b are formed into a bottomed cylindrical shape, for example, with the bottom side disposed on the cylinder head 44 side.

[0042] like Figure 5 As shown, the air compressor 22 has a 1-1 rib (1st rib) 72 provided on the outer wall of the cylinder body 42 to suppress the vibration of the cylinder body 42. Preferably, the 1-1 rib 72 is provided on the outer peripheral surface of the first cylinder portion 62 and the outer peripheral surface of the second cylinder portion 64. The 1-1 rib 72 is provided along the first piston 48a and the second piston 48b (see Figure 3 ) extends in the axial direction of the first and second cylindrical portions 62 and 64, which reciprocate, and projects in a direction perpendicular to the reciprocating direction of the pistons 48a and 48b. Preferably, the 1-1 rib 72 extends straight.

[0043] The air compressor 22 includes a 1-2 rib (3rd rib) 74 provided on the outer wall of the crankcase 52 and continuous with the 1-1 rib 72. The 1-2 rib 74 protrudes radially outward from the outer peripheral surface of the cylindrical crankcase 52.

[0044] The air compressor 22 also includes a 1-3 rib (1st rib) 76 provided near the boundary between the first cylindrical portion 62 and the second cylindrical portion 64 and parallel to the 1-1 rib 72 .

[0045] The air compressor 22 includes a 1-4 rib (3rd rib) 78 provided on the outer wall of the crankcase 52 and continuous with the 1-3 rib 76 .

[0046] The air compressor 22 includes second ribs 82 provided on the outer wall of the crankcase 52 , projecting radially from the central axis of the crankshaft 46 , and suppressing vibration of the crankcase 52 .

[0047] The air compressor 22 includes an inclined rib (fourth rib) 84 provided on the outer wall of the crankcase 52 and intersecting the second rib 82 and the 1-2 rib 74 .

[0048] Although not shown in the figure, it is preferable that the air compressor 22 is located between the cylinder block 42 and the cylinder block 42. Figure 3 and Figure 5 The surface opposite to the illustrated side also has ribs 72 , 74 , 76 , 78 , 82 , and 84 .

[0049] exist Figure 6 The right figure shows a cross-sectional view of the rib 72. Figure 6 The left picture and Figure 6 The figure in the center is a comparative example of rib 72. Figure 6 The ribs in the left picture are marked with the number 721. Figure 6 The rib in the center of the figure is marked with the number 722.

[0050] Figure 6 The ribs 72, 721, and the lower side of 721 are integrally formed with the cylinder body 42. Figure 6 The cross-sectional coefficients of ribs 72, 721, and 721 are greater than those of ribs 722 in the center. Figure 6 The rib 721 on the left side of the embodiment is larger than the rib 722 in the center. Figure 6 The ribs 72, 721, and 722 shown have higher rigidity as they are closer to the right. Therefore, in this embodiment, it is preferred to use ribs 72, 74, 76, 78, 82, and 84 with a height H greater than a width W. Figure 6 The ratio of the height H to the width W of each rib 72 , 74 , 76 , 78 , 82 , 84 , H / W is preferably greater than 1.

[0051] Moreover, if Figure 7 As shown, the internal combustion engine assembly 12 includes a block-shaped bracket 90 formed of cast iron. This bracket 90 secures the outer peripheral surface of the crankcase 52 of the air compressor 22 to, for example, the internal combustion engine 24. Preferably, the bracket 90 is secured to a lower securing portion 52a of the outer peripheral surface of the crankcase 52 of the air compressor 22. By securing the air compressor 22 on or near an imaginary plane extending from the central axes of the pistons 48a and 48b, the cylinder block 42 including the crankcase 52 can suppress the generation of a moment of inertia.

[0052] The following shows the results of vibration analysis of the air compressor 22 described above, when vibration is applied at an appropriate frequency in the direction along which pistons 48a, 48b move (the vertical direction), and in the left-right direction perpendicular to the vertical direction in which pistons 48a, 48b move. The left-right direction herein is perpendicular to an imaginary plane extending through the two center axes defined by the two pistons 48a, 48b.

[0053] Specifically, the driving force from the power gear 32 of the internal combustion engine 24 rotates the crankshaft 46 via the idle gear 34 and the driven gear 36. Furthermore, as the crankshaft 46 rotates, the first piston 48a moves up and down within the first cylindrical portion 62 via the first connecting rod 47a, and the second piston 48b moves up and down within the second cylindrical portion 64 via the second connecting rod 47b. In this state, the air compressor 22 tends to vibrate in the vertical direction and in the left and right direction.

[0054] exist Figure 8The results of the analysis when the air compressor 22 is vibrated in the vertical direction are shown in FIG. The horizontal axis is the frequency (Hz) and the vertical axis is the acceleration (m / s 2 At this time, peaks appear when the input frequency to the air compressor 22 is around 500 Hz to 600 Hz, around 2000 Hz to 2300 Hz, and around 2500 Hz to 2800 Hz.

[0055] exist Figures 9A to 9C Analytical results of vibration response analysis (operation at each peak value) of the air compressor 22 in the vertical direction are shown in FIG. Figures 9A to 9C The colors of the graphs represent the relative displacement of the graphs. Figure 9A The figure and Figure 9B There is no correlation in the colors of the plots shown.

[0056] Figure 9A The following diagram shows an example of the operation of air compressor 22 when the input frequency to air compressor 22 is 500 Hz or higher. As an example, the left side shows 575 Hz, and the right side shows 585 Hz. Although deformation is visible, the maximum displacement of air compressor 22 is within 0.5 mm, and the displacement is kept low.

[0057] Figure 9B An example of the operation of air compressor 22 is shown when the input frequency to air compressor 22 is 2000 Hz or higher. As an example, the left side shows 2178 Hz, and the right side shows 2048 Hz. Although deformation is observed in various locations, the maximum displacement of air compressor 22 is within 0.9 mm, and the displacement is kept low.

[0058] Figure 9C An example of the operation of air compressor 22 is shown when the input frequency to air compressor 22 is 2500 Hz or higher. As an example, the left side shows 2704 Hz, and the right side shows 2557 Hz. Although deformation is observed in various places, the maximum displacement of air compressor 22 is within 2 mm, and the displacement is kept low.

[0059] exist Figure 10 The results of the analysis when the air compressor 22 is vibrated in the left and right directions are shown in FIG. The horizontal axis is the frequency (Hz) and the vertical axis is the acceleration (m / s 2 At this time, peak values ​​appear near the input frequencies of the air compressor 22 of 350 Hz to 450 Hz (~500 Hz), 1800 Hz to 2000 Hz (~2000 Hz), and 2000 Hz to 2250 Hz (2000 Hz~).

[0060] exist Figures 11A to 11CAnalytical results of vibration response analysis (operation at each peak value) of the air compressor 22 in relation to the left and right directions are shown in FIG.

[0061] Figure 11A An example of the operation of air compressor 22 is shown when the input frequency to air compressor 22 is between 500 Hz and 406 Hz on the left and 394 Hz on the right. Although deformation is observed in various locations, the maximum displacement of air compressor 22 is approximately 0.5 mm, indicating that the displacement is kept low.

[0062] Figure 11B An example of the operation of air compressor 22 when the input frequency to air compressor 22 is between 2000 Hz and 1906 Hz is shown on the left, and 1784 Hz is shown on the right. Although deformation is observed in various locations, the maximum displacement of air compressor 22 is approximately 0.8 mm, indicating that the displacement is kept low.

[0063] Figure 11C An example of the operation of air compressor 22 is shown when the input frequency to air compressor 22 is 2000 Hz or higher. As an example, the left side shows 2178 Hz, and the right side shows 2048 Hz. Although deformation is observed in various locations, the maximum displacement of air compressor 22 is approximately 0.9 mm, indicating that the displacement is kept low.

[0064] Therefore, in Figure 8 and Figure 10 In the vibration analysis results of the air compressor 22 shown, the maximum displacement is suppressed to a low level.

[0065] According to the results of the analysis and the actual operation of the air compressor 22, if the pistons 48a and 48b move up and down, the housing of the air compressor 22 (cylinder block 42 and cylinder head 44) ​​will move to the Figure 3 The proximal and distal sides of the movement, so it is assumed that Figure 5 The presence of the 1-1st rib 72, 1-2nd rib 74, 1-3rd rib 76, and 1-4th rib 78 shown above exerts a greater effect on suppressing vibration. It is anticipated that the presence of the first ribs (1-1st rib 72 and 1-3rd rib 76) provided on the outside of the first and second cylindrical portions 62, 64, which receive the vertical movement of the pistons 48a and 48b, exerts a greater effect on suppressing vibration.

[0066] When the crankshaft 46 of the air compressor 22 rotates, the housing (cylinder block 42 and cylinder head 44) ​​of the air compressor 22 moves to the Figure 3 The proximal and distal sides and the vertical direction of movement, so it is assumed that Figure 5The presence of the 1-1st rib 72, the 1-2nd rib 74, the 1-3rd rib 76, the 1-4th rib 78, and the 2nd rib 82 exert a greater effect on suppressing vibration.

[0067] In addition, if the crankshaft 46 of the air compressor 22 swings and rotates, the pistons 48a and 48b move up and down, it is assumed that not only Figure 5 The presence of the 1-1st rib 72, 1-2nd rib 74, 1-3rd rib 76, 1-4th rib 78 and the 2nd rib 82 also suppresses the torsion of the crankcase 52 through the inclined ribs 84, thereby achieving a greater effect in suppressing vibration.

[0068] In this embodiment, an example in which the air compressor 22 has two cylinders is described. However, even if the air compressor has three cylinders or more, it is possible to suppress the increase in vibration, that is, noise, by forming ribs on the outer peripheral surface of the cylinder body 42 in the same manner as the above-mentioned ribs, or by appropriately forming ribs with higher rigidity on the outer peripheral surface of the cylinder body 42.

[0069] According to the present embodiment, it is possible to provide the air compressor 22 capable of suppressing an increase in vibration, ie, noise, even with a multi-cylinder configuration, the internal combustion engine assembly 12 including the air compressor 22 , and the vehicle 10 including the internal combustion engine assembly 12 .

[0070] In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made during the implementation stage without departing from the scope of its main purpose. In addition, the various embodiments can be appropriately combined and implemented, in which case the effect of the combination is obtained. Moreover, various inventions are included in the above-mentioned embodiments, and various inventions can be extracted by combining the multiple components selected from the disclosed components. For example, even if a few components are deleted from all the components shown in the embodiment, the problem can be solved and the effect can be obtained, the structure after deleting the components can be extracted as an invention.

Claims

1. An air compressor comprising: a cylinder block having a crankcase and a cylinder portion having a plurality of cylinders; a cylinder head covering the cylinder block; a crankshaft supported in the crankcase; a piston that reciprocates in the cylinder portion via the crankshaft, draws in air, and compresses and discharges the drawn-in air; and The first rib is provided on the outer wall of the cylinder block, extends in the direction along the reciprocating direction of the piston, and projects in a direction perpendicular to the reciprocating direction of the piston, thereby suppressing vibration of the cylinder block.

2. The air compressor according to claim 1, wherein The height of the first rib is greater than the width of the first rib.

3. The air compressor according to claim 1 or 2, wherein: A second rib is provided on the outer wall of the crankcase and protrudes radially from the central axis of the crankshaft to suppress vibration of the crankcase.

4. The air compressor according to claim 3, wherein: The height of the second rib is greater than the width of the second rib.

5. The air compressor according to claim 1 or 2, wherein: A third rib is provided on the outer wall of the crankcase and is continuous with the first rib.

6. The air compressor according to claim 5, wherein The height of the third rib is greater than the width of the third rib.

7. The air compressor according to claim 1 or 2, wherein: have: a second rib provided on an outer wall of the crankcase and projecting radially from the central axis of the crankshaft to suppress vibration of the crankcase; a third rib provided on the outer wall of the crankcase and continuous with the first rib; and The fourth rib is provided on the outer wall of the crankcase and intersects with the second rib and the third rib.

8. An internal combustion engine assembly comprising: The air compressor according to claim 1 or claim 2; internal combustion engines; and A block-shaped bracket fixes the outer peripheral surface of the crankcase of the air compressor relative to the internal combustion engine.

9. A vehicle comprising the internal combustion engine assembly according to claim 8.

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