Engine

Abstract

To prevent damage of an exhaust pipe caused by vibration of an engine and absorb heat expansion of the exhaust pipe.SOLUTION: An engine includes an engine body, an exhaust pipe 12, and a stay 16 which fixes the exhaust pipe 12 to the engine body. The stay 16 includes: a stay body 17; a first joint part 18 which is provided at one end of the stay body 17 and joined to the engine body; and a second joint part 19 which is provided at the other end of the stay body 17 and joined to the exhaust pipe 12. A joint direction of the first joint part 18 differs from a joint direction of the second joint part 19.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an engine. [Background technology]

[0002] An engine exhaust pipe is required to withstand vibrations and thermal expansion in various directions. For example, in the case of an exhaust pipe that connects auxiliary devices through which exhaust gas passes, such as a turbocharger and an exhaust gas purification device, the directions of vibrations and thermal expansion differ for each auxiliary device. In order to absorb vibrations and thermal expansion in various directions, it is effective to partially incorporate a flexible structure, such as a flexible pipe, into the exhaust pipe, but this requires the exhaust pipe to be long. However, simply lengthening the exhaust pipe increases the overall dimensions of the engine, so some ingenuity is required in the layout of the exhaust pipe. For example, it is possible to connect the exhaust pipe to an exhaust gas purification device located above the engine, via a portion below a turbocharger located near the exhaust manifold. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-162713 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, making the exhaust pipe longer increases the possibility of damage due to engine vibration. One possible method of suppressing vibration is to fix the exhaust pipe to the engine using an anti-vibration member, but if the anti-vibration member suppresses the thermal expansion of the exhaust pipe, there is a risk of the anti-vibration member being damaged. Patent Document 1 describes a configuration in which exhaust gas is sent to an exhaust gas purification device located above the engine via a turbocharger, but does not disclose any measures against vibration or thermal expansion of the exhaust pipe.

[0005] SUMMARY OF THE PRESENT INVETION The present invention has been made in consideration of the above circumstances and has an object to prevent damage to an exhaust pipe due to engine vibration and to absorb thermal expansion of the exhaust pipe. [Means for solving the problem]

[0006] In order to solve the above problems, the engine of the present invention comprises an engine body, an exhaust pipe, and a stay that fixes the exhaust pipe to the engine body, the stay comprising a stay main body, a first joint provided at one end of the stay main body and joined to the engine body, and a second joint provided at the other end of the stay main body and joined to the exhaust pipe, and the joining direction of the first joint is different from the joining direction of the second joint.

[0007] One of the joining direction of the first joint portion and the joining direction of the second joint portion may be a direction along the crankshaft of the engine body, and the other may be a direction intersecting the crankshaft.

[0008] The first joint portion and the second joint portion may be bent with respect to the stay body.

[0009] The stay body may be connected to a lower end of the first joint portion and a lower end of the second joint portion.

[0010] The engine body may include a bracket that supports an exhaust gas purification device, and the first joint portion may be joined to the bracket.

[0011] The exhaust gas purification device may be arranged above the engine body, the exhaust pipe may be arranged to the side of the engine body and connected to the exhaust gas purification device, the first joint may be joined to a lower part of the bracket, and the second joint may be joined to a lower part of the exhaust pipe. Effect of the Invention

[0012] According to the present invention, damage to the exhaust pipe caused by engine vibration can be prevented, and thermal expansion of the exhaust pipe can be absorbed. [Brief description of the drawings]

[0013] [Figure 1] 1 is a perspective view showing an engine according to an embodiment of the present invention. [Diagram 2] FIG. 4 is a perspective view showing the bracket, the downstream connecting pipe, and the stay. [Diagram 3] FIG. [Figure 4] FIG. 4 is an exploded view showing the downstream connecting pipe and the stay. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an engine 100 according to an embodiment of the present invention will be described with reference to the drawings.

[0015] First, the overall configuration of the engine 100 will be described. Fig. 1 is a perspective view showing the engine 100. In each drawing, U, Lo, L, R, Fr, and Rr indicate up, down, left, right, front, and rear, respectively. In this embodiment, an example in which the cylinder head 1 is provided above the cylinder block 2 is shown, but the engine 100 may be used in any position.

[0016] The engine 100 includes a cylinder head 1, a cylinder block 2, and an oil pan 5. The cylinder head 1, the cylinder block 2, and the oil pan 5 are collectively referred to as an engine body 101. The engine 100 is, for example, a diesel engine. A crankcase 2C having a crankshaft 2S is integrated with the cylinder block 2. In this embodiment, it is assumed that the axial direction of the crankshaft 2S is the front-rear direction.

[0017] Next, the exhaust path will be described. In the exhaust path, an exhaust manifold 10, a turbocharger 11, an exhaust pipe 12, and an exhaust gas purification device 13 are provided in this order from the upstream side in the exhaust direction. A tail pipe (not shown) is provided downstream of the exhaust gas purification device 13.

[0018] The turbocharger 11 includes a turbine 11T and a compressor 11C, whose axial direction is the front-to-rear direction. The turbine 11T is disposed behind the compressor 11C. Exhaust gas is supplied to the turbine 11T from the exhaust passage of the cylinder head 1 through the exhaust manifold 10. Air compressed by the compressor 11C is supplied to the cylinder head 1 through an intake manifold (not shown).

[0019] The exhaust gas discharged from the turbine 11T is sent to an exhaust gas purification device 13 via an exhaust pipe 12. The exhaust gas purification device 13 is, for example, a DPF (Diesel particulate filter), a urea SCR (Selective Catalytic Reduction) system, etc. The exhaust gas purification device 13 is provided above the cylinder head 1.

[0020] The exhaust pipe 12 includes an upstream connecting pipe 12U connected to the turbocharger 11, a downstream connecting pipe 12D connected to the exhaust gas purification device 13, and a flexible pipe 12F connecting the upstream connecting pipe 12U and the downstream connecting pipe 12D. The upstream connecting pipe 12U and the downstream connecting pipe 12D are formed using a metal such as stainless steel. The flexible pipe 12F is formed into a bellows shape with a circular cross section using a metal such as stainless steel, and has flexibility.

[0021] The exhaust gas that rotates the turbine 11T is discharged rearward. The upstream connecting pipe 12U is bent downward from the rear of the turbine 11T and then bent forward. The flexible pipe 12F is provided linearly with its longitudinal direction aligned in the front-to-rear direction. The upstream end of the flexible pipe 12F is connected to the downstream end of the upstream connecting pipe 12U.

[0022] A downstream side connecting pipe 12D is connected to the downstream end of the flexible pipe 12F. The downstream side connecting pipe 12D has, in order from the upstream side, an upstream section 12DU, an intermediate section 12DC, and a downstream section 12DD. The upstream section 12DU is provided along the front-rear direction. The intermediate section 12DC is inclined so that the downstream side is higher than the upstream side. The downstream section 12DD is provided along the up-down direction.

[0023] Fig. 2 is a perspective view showing the bracket 14, the downstream side connecting pipe 12D, and the stay 16. Fig. 3 is an exploded view showing the bracket 14 and the stay 16. Fig. 4 is an exploded view showing the downstream side connecting pipe 12D and the stay 16.

[0024] The exhaust gas purification device 13 is fixed to the cylinder block 2 via brackets 14, 15 (see FIG. 1) arranged on the front and rear sides, respectively, of the engine body 101. An engine body fixing part 14E that is fastened to the cylinder block 2 by a bolt is provided at the lower part of the bracket 14 (see FIGS. 2 and 3). A purification device fixing part 14A that is fastened to the exhaust gas purification device 13 by a bolt is provided at the upper part of the bracket 14. A stay joint part 14S is provided at the left part of the lower part of the bracket 14. A screw hole 14H is provided in the left-right direction in the stay joint part 14S. The bracket 14 may be fixed to the cylinder head 1.

[0025] A stay joint 12S is provided at the intermediate portion 12DC of the downstream connecting pipe 12D. The stay joint 12S protrudes from a portion of the outer circumferential surface of the intermediate portion 12DC facing forward and downward. A screw hole 12H is provided in the stay joint 12S in the front-rear direction.

[0026] The stay 16 includes a stay body 17 , a first joint portion 18 , and a second joint portion 19 . The stay body 17 is a plate-like member whose thickness direction is the up-down direction, and is formed in an arc shape having its center on the engine body 101 side. The first joint portion 18 is provided at one end of the stay body 17 on the engine body 101 side. The second joint portion 19 is provided at the other end of the stay body 17 on the exhaust pipe 12 side. The first joint portion 18 is a plate-like portion whose thickness direction is the left-right direction. The first joint portion 18 is provided with a screw hole 18H in the left-right direction. The second joint portion 19 is a plate-like portion whose thickness direction is the front-rear direction. The second joint portion 19 is provided with a screw hole 19H in the front-rear direction.

[0027] The first joint 18 is fastened to the stay joint 14S of the bracket 14 by using a bolt (not shown). That is, the joining direction 18D (see FIG. 3) of the first joint 18 is the left-right direction (direction intersecting the crankshaft 2S). The second joint 19 is fastened to the stay joint 12S of the exhaust pipe 12 by using a bolt (not shown). That is, the joining direction 19D (see FIG. 4) of the second joint 19 is the front-rear direction (direction of the crankshaft 2S). Note that the above-mentioned joining directions 18D, 19D are merely examples. As long as the joining direction 18D of the first joint 18 and the joining direction 19D of the second joint 19 are different, the joining directions 18D, 19D may be in any direction. Also, fastening with a bolt is merely one example of a joining method. The joining method of the first joint 18 and the second joint 19 may be welding, riveting, or the like.

[0028] The first joint portion 18 and the second joint portion 19 are bent relative to the stay body 17. The lower end portion of the first joint portion 18 is connected to the stay body 17. The lower end portion of the second joint portion 19 is connected to the stay body 17. In other words, the first joint portion 18 stands upright upward from the stay body 17. The second joint portion 19 stands upright upward from the stay body 17.

[0029] According to the engine 100 according to the present embodiment described above, the engine 101, the exhaust pipe 12, and the stay 16 for fixing the exhaust pipe 12 to the engine body 101 are provided. The stay 16 includes a stay body 17, a first joint 18 provided at one end of the stay body 17 and joined to the engine body 101, and a second joint 19 provided at the other end of the stay body 17 and joined to the exhaust pipe 12. The joining direction 18D of the first joint 18 and the joining direction 19D of the second joint 19 are different. According to this configuration, since the joining direction 18D of the first joint 18 and the joining direction 19D of the second joint 19 are different, it is possible to prevent the exhaust pipe 12 from vibrating in a plurality of directions. In addition, since the first joint 18 and the second joint 19 deform in different directions in response to the thermal expansion of the exhaust pipe 12, it is possible to absorb the thermal expansion in a plurality of directions. Therefore, according to this embodiment, damage to the exhaust pipe 12 due to vibrations of the engine 100 can be prevented, and the thermal expansion of the exhaust pipe 12 can be absorbed.

[0030] Furthermore, in the engine 100 according to this embodiment, one of the joining direction 18D of the first joint portion 18 and the joining direction 19D of the second joint portion 19 is the crankshaft 2S direction of the engine body 101, and the other is a direction intersecting the crankshaft 2S. This configuration makes it possible to prevent vibration of the exhaust pipe 12 in the crankshaft 2S direction and in a direction intersecting the crankshaft 2S. Also, it is possible to absorb thermal expansion of the exhaust pipe 12 in the crankshaft 2S direction and in a direction intersecting the crankshaft 2S.

[0031] Moreover, according to the engine 100 according to this embodiment, the first joint portion 18 and the second joint portion 19 are bent with respect to the stay body 17. With this configuration, the first joint portion 18 and the second joint portion 19 are bent and deformed in different directions in response to thermal expansion of the exhaust pipe 12, and therefore it is possible to absorb thermal expansion in a plurality of directions.

[0032] Furthermore, in the engine 100 according to this embodiment, the stay body 17 is connected to the lower end of the first joint portion 18 and the lower end of the second joint portion 19. With this configuration, even if the stay 16 is deformed due to thermal expansion of the exhaust pipe 12, the stay 16 is less likely to interfere with the exhaust pipe 12.

[0033] Moreover, according to the engine 100 of this embodiment, the engine body 101 includes a bracket 14 that supports the exhaust gas purification device 13, and the first joint portion 18 is joined to the bracket 14. According to this configuration, the bracket 14 that supports the exhaust gas purification device 13 can be used to attach the stay 16, so that an increase in the number of parts can be suppressed.

[0034] Furthermore, in the engine 100 according to this embodiment, the exhaust gas purification device 13 is disposed above the engine body 101, the exhaust pipe 12 is disposed to the side of the engine body 101 and is connected to the exhaust gas purification device 13, the first joint 18 is joined to the lower part of the bracket 14, and the second joint 19 is joined to the lower part of the exhaust pipe 12. With this configuration, when the exhaust gas purification device 13 is disposed above the engine body 101, it is possible to prevent the engine 100 from becoming large.

[0035] <Additional Notes> The above embodiment can be specified as follows.

[0036] <Appendix 1> The engine body, Exhaust pipe and a stay for fixing the exhaust pipe to the engine body, The stay is The stay body, A first joint portion provided at one end of the stay main body and joined to the engine main body; A second joint portion is provided at the other end of the stay body and joined to the exhaust pipe, An engine, wherein a joining direction of the first joint portion and a joining direction of the second joint portion are different.

[0037] <Appendix 2> The engine described in appendix 1, characterized in that one of the joining direction of the first joint portion and the joining direction of the second joint portion is a crankshaft direction of the engine body, and the other is a direction intersecting the crankshaft.

[0038] <Appendix 3> The engine according to claim 1 or 2, wherein the first joint portion and the second joint portion are bent with respect to the stay body.

[0039] <Appendix 4> The engine according to claim 3, wherein the stay body is connected to a lower end of the first joint portion and a lower end of the second joint portion.

[0040] <Appendix 5> The engine body includes a bracket for supporting an exhaust gas purification device, The engine according to any one of claims 1 to 4, wherein the first joint portion is joined to the bracket.

[0041] <Appendix 6> The exhaust gas purification device is disposed above the engine body, the exhaust pipe is disposed on a side of the engine body and is connected to the exhaust gas purification device; The first joint portion is joined to a lower portion of the bracket, The engine according to claim 5, wherein the second joint portion is joined to a lower portion of the exhaust pipe. [Explanation of symbols]

[0042] 2S crankshaft 12 Exhaust pipe 14 Bracket 16 Stay 17 Stay body 18 1st joint 19 Second joint 100 Engine 101 Engine body

Claims

1. The engine body, Exhaust pipe and a stay for fixing the exhaust pipe to the engine body, The stay is The stay body, A first joint portion provided at one end of the stay main body and joined to the engine main body; a second joint portion provided at the other end of the stay body and joined to the exhaust pipe, An engine, wherein a joining direction of the first joint portion and a joining direction of the second joint portion are different from each other.

2. 2. The engine according to claim 1, wherein one of the joining direction of the first joint portion and the joining direction of the second joint portion is a crankshaft direction of the engine body, and the other is a direction intersecting the crankshaft.

3. The engine according to claim 1 , wherein the first joint portion and the second joint portion are bent with respect to the stay body.

4. 4. The engine according to claim 3, wherein the stay body is connected to a lower end of the first joint portion and a lower end of the second joint portion.

5. The engine body includes a bracket for supporting an exhaust gas purification device, 5. The engine according to claim 1, wherein the first joint portion is joined to the bracket.

6. The exhaust gas purification device is disposed above the engine body, the exhaust pipe is disposed on a side of the engine body and is connected to the exhaust gas purification device; The first joint portion is joined to a lower portion of the bracket, 6. The engine according to claim 5, wherein the second joint portion is joined to a lower portion of the exhaust pipe.

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