JP2013124587A - Gas pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas pipe mounted to an engine in which the gas pipe can be prevented from being dropped off.SOLUTION: A gas pipe (10) is connected to an engine (1) for circulating blow-by gas exhausted from the engine to a gas reduction device (20) that reduces the gas and sends the gas to an intake side of the engine. The gas pipe comprises a first connecting part (12) connected to the engine, a second connecting part (13) connected to the gas reduction device, and a pipe body (11) connecting the first connecting part and the second connecting part which are integrally formed. The pipe body is composed of a member harder than that of the first connecting part and the second connecting part; and the pipe body includes a fixed part (15) fixed to an engine component connected to the engine.

Description

  The present invention relates to a gas pipe that is connected to an engine and that can prevent the pipe from coming off.

  An engine mounted on a vehicle is provided with various pipes. For example, blow-by gas that leaks from the crank chamber of the engine to the cylinder head is configured to be returned to the intake system via a filter such as a gas oil separator by a pipe that communicates from the rocker cover to the gas oil separator. (See Patent Document 1).

JP 2010-121537 A

  Conventional blow-by gas pipes are generally made of soft pipes such as rubber, and the connecting portions are prevented from coming off by clips or the like.

  In such a configuration, there is a possibility that the rubber blow-by gas piping may come off from the connection portion due to some external factors such as vibration and work around the engine. The blow-by gas piping reduces the raw gas of the engine to the engine intake system. When the blow-by gas piping is disconnected, the raw gas is discharged to the outside.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a gas pipe that can prevent a gas pipe from being removed from the engine.

  The present invention relates to a gas pipe that is connected to an engine and distributes the blow-by gas discharged from the engine to a gas reduction device that reduces the blow-by gas to the intake side of the engine. A second connection portion connected to the reduction device, and a pipe main body that connects the first connection portion and the second connection portion are integrally formed. The pipe main body includes the first connection portion and the second connection. It is comprised by the member harder than a part, The fixing | fixed part fixed to the engine components connected to an engine is formed in the piping main body, It is characterized by the above-mentioned.

  According to the present invention, since the pipe main body connected to the middle part of the gas pipe is formed of a member that is harder than the first or second connection portion, the gas pipe is prevented from being deformed. And since it fixes to an engine component by the fixing | fixed part formed in the piping main body of the intermediate part of gas piping, it is prevented that gas piping falls out.

It is a perspective view of an engine provided with blowby gas piping of an embodiment of the present invention. It is explanatory drawing which shows the structure of the engine of embodiment of this invention. It is a perspective view centering on the blowby gas piping of embodiment of this invention. It is a side view centering on the blowby gas piping of embodiment of this invention. It is sectional drawing of blowby gas piping centering on the flange part of embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of an engine 1 including a blow-by gas pipe according to an embodiment of the present invention.

  In the engine 1, vaporized fossil fuel is sent to a cylinder chamber together with air, the piston is pushed down by compressing the fuel, and the movement of the piston is output as rotational energy.

  The engine 1 is provided with a rocker cover 2 that covers the components of the cylinder head. The rocker cover 2 is provided with a blow-by gas pipe 10. The blow-by gas piping 10 reduces the blow-by gas staying inside the rocker cover 2 to the intake system via the gas reduction device 20.

  The engine 1 is further provided with an EGR pipe 50 for an exhaust gas reduction device (EGR).

  FIG. 2 is an explanatory diagram showing the configuration of the engine 1 according to the embodiment of the present invention.

  The engine 1 includes a cylinder block 3, a cylinder head 4, a rocker cover 2, an oil pan 5, an intake system pipe 6 and an exhaust system pipe 7.

  The cylinder block 3 includes a cylinder 3a, a piston 3b, a crankshaft 3c, and a crank chamber 3d, and the vertical movement of the piston 3b due to the combustion of fossil fuel is output as a rotational movement by the crankshaft 3c.

  The cylinder head 4 is provided with a camshaft, a rocker arm, a valve and the like (not shown) for sending fossil fuel and air to the cylinder 3a and discharging exhaust gas from the cylinder 3a. These are connected to the intake system pipe 6 and the exhaust system pipe 7.

  The rocker cover 2 covers components such as a cam shaft, a rocker arm, and a valve provided in the cylinder head 4 and supplies engine oil to these components.

  The cylinder head 4 is provided with an oil passage 4a through which engine oil supplied from the rocker cover 2 is circulated to the oil pan 5 via the cylinder block.

  During operation of the engine 1, part of the vaporized fossil fuel that is sent to the cylinder 3a leaks into the crank chamber 3d through the gap between the cylinder 3a and the piston 3b. The gas containing fuel leaked into the crank chamber 3d flows back through the oil passage 4a and leaks out to the cylinder head 4 as the volume of the crank chamber 3d changes due to the vertical movement of the piston 3b. This gas is called blow-by gas.

  Inside the rocker cover 2, there is provided a gas oil separation chamber 2 a for separating the blowby gas into a gas component and a liquid component. The gas oil separation chamber 2a separates the blow-by gas into a gas component and a liquid component (mainly engine oil) and sends the gas component to the blow-by gas pipe 10. The liquid component is circulated from the cylinder head to the oil pan 5 via the oil passage 4a.

  The blow-by gas is sent to the gas reduction device 20 via the blow-by gas pipe 10 connected to the rocker cover 2. The gas reduction device 20 further separates the blow-by gas into a gas component and a liquid component (mainly engine oil), and reduces the gas component to the intake system pipe 6. This gaseous component is sent again to the cylinder 3a and burned. The liquid component is circulated from the drain pipe 21 to the oil pan 5.

  Next, the blow-by gas piping 10 will be described.

  FIG. 3 is a perspective view centering on the blow-by gas piping 10 of the embodiment of the present invention, and FIG. 4 is a side view centering on the blow-by gas piping 10 of the embodiment of the present invention.

  The blow-by gas pipe 10 is a hollow pipe, and a first connection portion 12 provided on one side thereof is connected to a rocker cover connection port 23 formed in the rocker cover 2. Further, the second connection portion 13 provided on the other side of the blow-by gas pipe 10 is connected to a gas reduction device connection port 22 formed in the gas reduction device 20.

  In addition, the 1st connection part 12 and the 2nd connection part 13 are fixed to the rocker cover connection port 23 and the gas reduction apparatus connection port 22 with the clamp 41, respectively.

  The blow-by gas pipe 10 is provided in order to send blow-by gas that is connected in this way and leaks into the rocker cover 2 to the gas reduction device 20. The gas reduction device 20 separates the gas component and the liquid component from the blow-by gas, and reduces the gas component to the intake system pipe 6.

  The blow-by gas pipe 10 is curved upward from the first connection part 12 formed in the lateral direction and then extended in the lateral direction, and further curved downward and communicated with the second connection part 13 in the lateral direction. . The first connection portion and the second connection portion are connected to each other by the curved portion (pipe body) 11. Note that the opening of the first connecting portion 12 and the opening of the second connecting portion 13 open in opposite directions.

  In the blow-by gas pipe 10, the first connection portion 12 and the second connection portion 13 are formed of a soft member such as rubber, for example. Moreover, the piping main body 11 connected between these 1st connection parts 12 and the 2nd connection parts 13 is formed with hard members, such as resin, for example. The 1st connection part 12, the piping main body 11, and the 2nd connection part 13 are shape | molded integrally.

  A gas detection sensor mounting portion 14 and a flange portion 15 are formed in the pipe body 11 of the blow-by gas pipe 10.

  The gas detection sensor mounting portion 14 is provided with a blow-by gas detection sensor 61 that detects gas passing through the blow-by gas pipe. The blow-by gas detection sensor 61 is for determining whether leakage has occurred in the blow-by gas, and is configured by, for example, a pressure sensor.

  The flange portion 15 is a fixing portion that fixes the blow-by gas pipe 10 by being fixed to an engine component (for example, the EGR pipe 50) provided in the vicinity of the blow-by gas pipe 10 with a bolt or the like.

  Next, the structure of the flange portion 15 will be described.

  A flange portion 15 extends from the pipe body 11 of the blow-by gas pipe 10. The flange portion 15 supports the blow-by gas pipe 10 to the EGR pipe 50 by being fixed to the EGR pipe 50.

  The flange portion 15 is fixed to the EGR pipe 50 by being screwed into a bolt hole of the EGR pipe 50 with a bolt 45. In addition, the flange portion 15 includes an EGR detection sensor mounting portion 42 for mounting an EGR gas detection sensor 62 that detects gas passing through the EGR pipe 50.

  FIG. 5 is a cross-sectional view of the blow-by gas pipe 10 centering on the flange portion 15 according to the embodiment of the present invention.

  The flange portion 15 is fixed to an EGR pipe 50 provided in the vicinity of the blow-by gas pipe 10.

  The EGR pipe 50 is formed with a flange connection portion 52 to which the flange portion 15 is fixed. The flange connection portion 52 is formed with a communication port 52 a that communicates with the gas passage of the EGR pipe 50.

  The EGR gas detection sensor 62 is fixed to the flange portion 15, and the sensor end 62a of the EGR gas detection sensor 62 is exposed at the communication port 52a. Thereby, the EGR gas detection sensor 62 detects the EGR gas at the communication port 52a. The EGR gas detection sensor 62 is constituted by, for example, a temperature sensor, and detects the temperature of the EGR gas.

  The flange portion 15 has an annular shape in which a bolt hole 44 through which a bolt 45 for fixing to the flange connection portion 52 is inserted, an EGR detection sensor attachment portion 42 to which an EGR gas detection sensor 62 is attached, and an O-ring 46 are interposed. Ring groove 46a.

  The EGR detection sensor mounting portion 42 is configured by embedding an insert nut into which the EGR gas detection sensor 62 is screwed in the flange portion 15. An end portion of the EGR gas detection sensor 62 is provided with a washer 62a for preventing leakage of EGR gas.

  Next, the attachment structure of the blowby gas piping 10 of the embodiment of the present invention configured as described above will be described.

  Referring to FIG. 3, in the blow-by gas pipe 10, the first connection portion 12 is connected to the rocker cover connection port 23, and the second connection portion 13 is connected to the gas reduction device connection port 22. The opening part of the rocker cover connection port 23 and the opening part of the gas reduction device connection port 22 are opened in a direction facing each other. Moreover, the opening part of the 1st connection part 12 and the opening part of the 2nd connection part 13 are opened in the direction opposite to each other.

  In order to fix the blow-by gas pipe 10, the longitudinal direction of the blow-by gas pipe 10 is shortened, and the first connection portion 12 and the second connection portion 13 are connected to the rocker cover connection port 23 and the gas reduction device, respectively. Insert into mouth 22.

  In the blow-by gas pipe 10, only the first connection part 12 and the second connection part 13 made of a soft member serve as a shortening allowance, and the blow-by gas pipe 10 is connected between the first connection part 12 and the second connection part 13. The rigid pipe main body 11 is structured so as not to be shortened. With such a configuration, the blow-by gas pipe 10 is configured so that a portion for shortening is small, so that deformation in a direction in which the blow-by gas pipe 10 is detached is suppressed, and the blow-by gas pipe 10 is disposed between the rocker cover 2 and the gas reducing device 20. Therefore, the blow-by gas pipe 10 is prevented from coming off.

  Further, a flange portion 15 is formed in the pipe main body 11 at an intermediate portion of the blow-by gas pipe 10, and the flange portion 15 is fixed to the EGR pipe 50 that passes immediately below the blow-by gas pipe 10. The movement is suppressed and the blow-by gas pipe 10 is prevented from coming off.

  With such a structure, the blow-by gas pipe 10 is prevented from being detached from the engine 1.

  Further, the blow-by gas pipe 10 is provided with a blow-by gas detection sensor 61, and the state (for example, pressure) of the blow-by gas passing through the blow-by gas pipe 10 is always detected during operation of the engine 1. With such a configuration, it is possible to detect that the blow-by gas pipe 10 has been disconnected when the blow-by gas detection sensor 61 changes the state of the blow-by gas (for example, when the pressure decreases).

  Further, a flange portion 15 is formed in the blow-by gas pipe 10, and an EGR gas detection sensor 62 that detects EGR gas passing through the EGR pipe 50 is fixed to the flange portion 15. As described above, by providing a process for attaching parts other than the constituent parts of the blow-by gas pipe 10 to the blow-by gas pipe 10, the EGR gas detection sensor 62 cannot be attached when the blow-by gas pipe 10 is not provided. Therefore, forgetting to attach the blow-by gas pipe 10 can be prevented by combining a plurality of processes.

  As described above, the blow-by gas pipe 10 according to the embodiment of the present invention distributes the blow-by gas discharged from the engine 1 to the gas reduction device 20 that reduces the blow-by gas to the intake system pipe 6 of the engine 1. A first connecting part 12 connected to the first connecting part, a second connecting part 13 connected to the gas reduction device 20, a piping main body 11 connecting the first connecting part 12 and the second connecting part 13, and 11, Are integrally formed. The pipe body 11 is formed of a member that is harder than the first connection part 12 and the second connection part 13, and is fixed to the engine part (EGR pipe 50) connected to the engine 1. A flange portion 15 is formed as a fixed portion.

  By comprising in this way, when the piping main body 11 is formed with a member harder than the 1st connection part 12 or the 2nd connection part 13, it is suppressed that the blowby gas piping 10 deform | transforms. Moreover, since it fixes to the EGR piping 50 by the flange part 15 formed in the piping main body 11 which is an intermediate part of the blow-by gas piping 10, it is prevented that the blow-by gas piping 10 comes off.

  In the embodiment of the present invention, the flange portion 15 of the blow-by gas pipe 10 is fixed to the EGR pipe 50. However, the present invention is not limited to this. What is necessary is just to arrange | position and form the flange part 15 so that the flange part 15 may be fixed to the engine component with which it adjoins to the blowby gas piping 10. FIG.

  It goes without saying that the present invention is not limited to the above-described embodiments, and includes various modifications and improvements that can be made within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Engine 2 Rocker cover 6 Intake system piping 10 Blow-by gas piping 11 Piping main body 12 1st connection part 13 2nd connection part 14 Gas detection sensor attachment part 15 Flange part 20 Gas reduction apparatus 22 Gas reduction apparatus connection port 23 Rocker cover Connection port 42 EGR detection sensor mounting part 50 EGR piping 61 Blow-by gas detection sensor 62 EGR gas detection sensor

Claims (4)

A gas pipe connected to an engine and flowing to a gas reduction device for reducing blow-by gas discharged from the engine to an intake side of the engine;
A first connecting part connected to the engine, a second connecting part connected to the gas reduction device, and a pipe body connecting the first connecting part and the second connecting part; Integrally formed,
The pipe body is composed of a member that is harder than the first connection part and the second connection part,
A gas pipe characterized in that a fixed portion fixed to an engine component connected to the engine is formed in the pipe main body.   The gas pipe according to claim 1, wherein the pipe main body is formed with a detection portion attachment portion to which a detection portion for detecting the blow-by gas is attached. The engine component is an EGR pipe through which EGR gas flows.
The fixing part is fixed to the EGR pipe, and the fixing part is formed with an EGR gas detection part attachment part to which an EGR gas detection part for detecting EGR gas flowing through the EGR pipe is attached. The gas pipe according to claim 1 or 2, characterized by the above.   5. The gas according to claim 1, wherein the opening portion of the first connection portion and the opening portion of the second connection portion are disposed in opposite directions to each other. Plumbing.

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