JP2009036100A - Internal combustion engine structure body and sensor attachment member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine structure body or the like, which prevents a temperature of a gas sensor from exceeding the heat resistant temperature while securing early activation of the gas sensor, and improves flexibility on designing of the internal combustion engine main body or the like. <P>SOLUTION: The internal combustion engine structure body 100 includes: an internal combustion engine main body 110 having an exhaust port part 111 discharging exhaust gas; and an introduction port part 121 through which exhaust gas is introduced, and also includes: an exhaust pipe 120 making exhaust gas flow therein and discharging exhaust gas to an outside; and the gas sensor 190 capable of detecting specific gas component in exhaust gas. The sensor attachment member 130 attaching the gas sensor 190 to the sensor attachment part 133 provided on itself is put between the exhaust port part 111 of the internal combustion engine main body 110 and the introduction port part 121 of the exhaust pipe. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an internal combustion engine structure having an internal combustion engine body, an exhaust pipe, and a gas sensor, and a member constituting the internal combustion engine structure.

Conventionally, it is known to attach a gas sensor capable of detecting a specific gas component in exhaust gas to an internal combustion engine body or an exhaust pipe. For example, Patent Documents 1 to 5 disclose such techniques.
Patent Document 1 describes a technique of attaching an oxygen sensor to a predetermined portion of a dual exhaust manifold in an exhaust pipe (see FIG. 1 of Patent Document 1).
Also in Patent Document 2, an oxygen sensor is attached to a predetermined portion of the exhaust manifold in the exhaust pipe (see FIG. 1 of Patent Document 2).

On the other hand, Patent Document 3 describes a technique of attaching an exhaust gas sensor to a predetermined part of a cylinder head in an internal combustion engine body (see FIG. 1 of Patent Document 3 and its explanation part).
Also in Patent Document 4, an oxygen concentration sensor is attached to a predetermined portion of the cylinder head in the internal combustion engine body (see FIG. 2 of Patent Document 4).
Also in Patent Document 5, an exhaust gas sensor is attached to a predetermined portion of the cylinder head in the internal combustion engine body (see FIG. 6 of Patent Document 5).

JP-A-6-74034 Japanese Utility Model Publication No.59-952 JP 2004-316430 A JP 2000-257466 A JP 2005-207231 A

  The exhaust pipe becomes hot due to exhaust gas during use. In particular, an upstream portion of the exhaust pipe close to the internal combustion engine body on the upstream side tends to be particularly hot because the exhaust gas temperature is high. And when attaching a gas sensor to an exhaust pipe like the said patent documents 1, 2, it is ideal to attach to an upstream site | part with high exhaust temperature from the objective of shortening the active time of a sensor element. However, since such an attachment part can become very high as described above, there is a possibility that the gas sensor will exceed its heat resistance temperature.

  On the other hand, the engine block and cylinder head of the internal combustion engine main body are cooled by cooling water or engine oil, and therefore do not reach a higher temperature than the upstream portion of the exhaust pipe. Therefore, as in Patent Documents 3 to 5, if the gas sensor is attached to the cylinder head of the internal combustion engine body, the gas sensor can be prevented from exceeding the heat resistance temperature. Further, since the exhaust gas in the cylinder head is at a high temperature, there is an advantage that the activation time of the sensor element can be sufficiently shortened. However, when the gas sensor is directly attached to the internal combustion engine body, a mounting portion for the gas sensor must be separately formed on the internal combustion engine body. Moreover, in order to ensure the space and attachment property which attach a gas sensor to an internal combustion engine main body, it is necessary to consider the form of an internal combustion engine main body or a gas sensor.

  The present invention has been made in view of such a current situation, and without attaching the gas sensor directly to the exhaust pipe or the internal combustion engine body, the activation time of the gas sensor can be shortened and the gas sensor can be prevented from exceeding the heat-resistant temperature. It is an object of the present invention to provide an internal combustion engine structure and a sensor mounting member for constituting such an internal combustion engine structure.

  The solution includes an internal combustion engine main body having an exhaust port portion including an exhaust port for discharging exhaust gas, and an introduction port portion including an introduction port into which the exhaust gas is introduced, and the exhaust gas flows and the An internal combustion engine structure comprising: an exhaust pipe that exhausts exhaust gas to the outside; and a gas sensor that includes a sensor unit that detects a specific gas component in the exhaust gas, wherein the exhaust port part of the internal combustion engine body and the A communication passage that is interposed between the introduction port portion of the exhaust pipe and connects the exhaust port and the introduction port; and a sensor attachment portion that attaches the gas sensor and positions the sensor unit in the communication passage. And an internal combustion engine structure including a sensor mounting member thermally connected to the exhaust port portion.

In the internal combustion engine structure of the present invention, a sensor mounting member is interposed between the exhaust port portion of the internal combustion engine body and the inlet port portion of the exhaust pipe. And the gas sensor is attached to the sensor attachment part of this sensor attachment member.
In this manner, the gas sensor is not directly attached to the internal combustion engine body, but is attached to a separately prepared sensor attachment member, so that it is not necessary to separately form a gas sensor attachment portion on the internal combustion engine body. Further, it is not necessary to consider the form of the internal combustion engine main body and the gas sensor in order to secure the space for mounting the gas sensor on the internal combustion engine main body and the mountability.

In addition, since the sensor mounting member is interposed between the internal combustion engine body and the exhaust pipe, the exhaust gas flowing through the communication path of the sensor mounting member is sufficiently hot. For this reason, the activation time of the gas sensor can be sufficiently shortened.
In addition, the heat transmitted from the exhaust gas flowing through the communication path to the sensor mounting member and the heat transmitted from the gas sensor to the sensor mounting member can be radiated from the sensor mounting member to the outside air, and the cooling water and engine oil can be used. It can be transmitted to the internal combustion engine body to be cooled. For this reason, since it can suppress that the member for sensor attachment becomes high temperature, it can prevent that the gas sensor attached to this exceeds heat-resistant temperature.

The “internal combustion engine body” has an exhaust port portion including an exhaust port for discharging exhaust gas as described above, but the exhaust port portion may be a single or a plurality. When there are a plurality of exhaust ports, sensor mounting members may be interposed between all of the exhaust ports and the exhaust pipe, or some exhaust ports and the exhaust pipe A sensor mounting member may be interposed only between them.
In addition, the “sensor mounting member” is interposed between the exhaust port portion of the internal combustion engine main body and the inlet port portion of the exhaust pipe as described above, and is directly connected to the exhaust port portion and the inlet port portion. Alternatively, it may be connected indirectly through a gasket or the like.
The term “thermally connected” between the sensor mounting member and the exhaust port means that heat is transmitted from one to the other, contrary to thermal insulation. For example, when both are mechanically connected directly and thermally connected, or both are mechanically indirectly connected via a metal gasket etc., but thermally connected Is mentioned.
In addition, the “exhaust pipe” has an introduction port portion including an introduction port into which exhaust gas is introduced as described above, and exhausts exhaust gas to the outside. It may be divided into

  Further, in the internal combustion engine structure described above, the sensor mounting member is made of a material having a higher thermal conductivity than a material constituting the introduction port portion of the exhaust pipe. And good.

In the present invention, any part of the sensor mounting member is made of a material having higher thermal conductivity than the material constituting the introduction port portion of the exhaust pipe. For this reason, compared with the case where a material having the same or lower thermal conductivity than the material constituting the inlet portion of the exhaust pipe is used, it is transmitted from the exhaust gas flowing through the communication path to the sensor mounting member. Heat and heat transmitted from the gas sensor to the sensor mounting member can be radiated from the sensor mounting member to the outside air more efficiently and can be transmitted to the internal combustion engine body more efficiently. Therefore, since it can further suppress that the member for sensor attachment becomes high temperature, it can prevent more reliably that the gas sensor attached to this exceeds heat-resistant temperature.
The material for the sensor mounting member can be appropriately selected in consideration of heat resistance and the like. For example, when the material constituting the inlet portion of the exhaust pipe is iron, stainless steel, or titanium, the sensor mounting member The material can be aluminum, aluminum alloy, copper or copper alloy having higher thermal conductivity than them.

  Further, in the internal combustion engine structure, the sensor mounting member includes a communication path constituting part that forms the communication path, and surrounds the periphery of the communication path constituting part, and is exposed to the outside. And an outer constituent part provided with the sensor mounting part, wherein the communication path constituent part is more thermally conductive than a material constituting the outer constituent part. The internal combustion engine structure is preferably made of a low-quality material.

  In the present invention, the sensor mounting member has the communication path component and the outer component as described above, and the communication path component is made of a material having lower thermal conductivity than the material constituting the outer component. . Since the thermal conductivity of the communication path component is low, it is possible to suppress heat from being transmitted from the exhaust gas flowing through the communication channel to the outer component via the communication path component. On the other hand, because the thermal conductivity of the outer component is high, heat transferred from the communication channel component to the outer component and heat transferred from the gas sensor to the outer component can be efficiently radiated from the outer component to the outside air. , Can be efficiently transmitted to the internal combustion engine body. Therefore, since it can further suppress that an outer side composition part becomes high temperature, it can prevent still more reliably that the gas sensor attached to this exceeds heat-resistant temperature.

  Further, in the internal combustion engine structure described above, it is preferable that the outer constituent portion is an internal combustion engine structure made of a material having higher thermal conductivity than a material constituting the inlet portion of the exhaust pipe.

  In the present invention, the outer constituent portion is made of a material having higher thermal conductivity than the material constituting the exhaust pipe. For this reason, compared with the case where a material having the same or lower thermal conductivity than the material constituting the inlet portion of the exhaust pipe is used, the heat transmitted from the communication path component to the outer component, the gas sensor The heat transferred from the outer component to the outside component can be radiated from the outer component to the outside air more efficiently, and can be transferred to the internal combustion engine body more efficiently. Therefore, since it can further suppress that an outer side composition part becomes high temperature, it can prevent still more reliably that the gas sensor attached to this exceeds heat-resistant temperature.

  The internal combustion engine structure according to any one of the above, wherein the first gasket interposed between the exhaust port portion of the internal combustion engine body and the sensor mounting member, the sensor mounting member, and the An internal combustion engine structure made of a material having a higher thermal conductivity than a material constituting the second gasket, and a second gasket interposed between the introduction port portion of the exhaust pipe, Good.

  In the present invention, the first gasket interposed between the exhaust port portion of the internal combustion engine body and the sensor mounting member is replaced with the second gasket interposed between the sensor mounting member and the inlet port portion of the exhaust pipe. It is made of a material having higher thermal conductivity than the constituent material. For this reason, the heat transmitted from the exhaust gas flowing through the communication path of the sensor mounting member to the sensor mounting member and the heat transmitted from the gas sensor to the sensor mounting member are passed through the first gasket having high thermal conductivity, and the internal combustion engine. Can communicate efficiently to the main body. On the other hand, since the second gasket has low thermal conductivity, heat from the exhaust pipe that has reached a high temperature can be prevented from being transmitted to the sensor mounting member through the second gasket. Thereby, since it can suppress more effectively that the member for sensor attachment becomes high temperature, it can prevent more reliably that the gas sensor attached to this exceeds heat-resistant temperature.

  Furthermore, in the internal combustion engine structure according to any one of the above, the sensor mounting member may be an internal combustion engine structure having a cooling fin portion for cooling itself.

  In the present invention, the sensor mounting member has a cooling fin portion for cooling itself. For this reason, the heat transferred from the exhaust gas flowing through the communication path to the sensor mounting member and the heat transferred from the gas sensor to the sensor mounting member can be efficiently radiated to the outside air through the cooling fin portion. Therefore, since it can further suppress that the member for sensor attachment becomes high temperature, it can prevent more reliably that the gas sensor attached to this exceeds heat-resistant temperature.

  In addition, the other solution means has the exhaust port portion of the internal combustion engine main body having an exhaust port portion including an exhaust port for exhaust gas exhaust, and an introduction port portion including an introduction port into which the exhaust gas is introduced, The exhaust gas circulates and the exhaust port that exhausts the exhaust gas to the outside is configured to be interposed between the exhaust port and the introduction port, and the communication path that connects the exhaust port, A gas sensor having a sensor part for detecting a specific gas component in the exhaust gas, and a sensor attaching part capable of attaching the sensor part to a state where the sensor part is located in the communication path. It is the member for sensor attachment made into the form which can be connected.

The sensor mounting member of the present invention can be interposed between the exhaust port portion of the internal combustion engine main body and the exhaust port introduction port portion with the gas sensor mounted on the sensor mounting portion. Therefore, if this sensor mounting member is used, it is not necessary to separately form a gas sensor mounting portion in the internal combustion engine body. Further, it is not necessary to consider the form of the internal combustion engine main body and the gas sensor in order to secure the space for mounting the gas sensor on the internal combustion engine main body and the mountability.
Further, since the sensor mounting member is interposed between the internal combustion engine body and the exhaust pipe, the exhaust gas flowing through the communication path of the sensor mounting member is sufficiently hot. For this reason, the activation time of the gas sensor can be sufficiently shortened.
In addition, the heat transmitted from the exhaust gas flowing through the communication path to the sensor mounting member and the heat transmitted from the gas sensor to the sensor mounting member can be radiated from the sensor mounting member to the outside air, and the cooling water and engine oil can be used. It can be transmitted to the internal combustion engine body to be cooled. For this reason, since it can suppress that the member for sensor attachment becomes high temperature, it can prevent that the gas sensor attached to this exceeds heat-resistant temperature.

  Further, in the sensor mounting member described above, any part may be a sensor mounting member made of aluminum, an aluminum alloy, copper, or a copper alloy.

  Since the sensor mounting member of the present invention is made of aluminum, aluminum alloy, copper, or copper alloy in any part, the thermal conductivity is high. Therefore, the heat transmitted from the exhaust gas flowing through the communication passage to the sensor mounting member and the heat transmitted from the gas sensor attached to the sensor mounting member to the sensor mounting member can be efficiently radiated from the sensor mounting member to the outside air, It can be efficiently transmitted to the internal combustion engine body. Therefore, since it can further suppress that the member for sensor attachment becomes high temperature, it can prevent more reliably that the gas sensor attached to this exceeds heat-resistant temperature.

  Further, the sensor mounting member is a communication path component that forms the communication path, and surrounds the periphery of the communication path structure and is exposed to the outside, and heat is applied to the exhaust port of the internal combustion engine body. An external component provided with the sensor mounting portion, and the communication path component is made of a material having lower thermal conductivity than a material constituting the outer component. It is preferable to use a sensor mounting member.

  The sensor mounting member according to the present invention includes the above-described communication path component and the outer component, and the communication path component is made of a material having lower thermal conductivity than the material constituting the outer component. Since the thermal conductivity of the communication path component is low, it is possible to suppress heat from being transmitted from the exhaust gas flowing through the communication channel to the outer component via the communication path component. On the other hand, because the thermal conductivity of the outer component is high, heat transferred from the communication channel component to the outer component and heat transferred from the gas sensor to the outer component can be efficiently radiated from the outer component to the outside air. , Can be efficiently transmitted to the internal combustion engine body. Therefore, since it can further suppress that an outer side component becomes high temperature, it can prevent more reliably that the gas sensor attached to this exceeds heat-resistant temperature.

  Further, in the sensor mounting member described above, the outer constituent portion may be a sensor mounting member made of aluminum, aluminum alloy, copper, or copper alloy.

  In the sensor mounting member of the present invention, the outer constituent portion is made of aluminum, aluminum alloy, copper, or copper alloy, and thus the outer constituent portion has high thermal conductivity. For this reason, heat transferred from the communication path component to the outer component and heat transferred from the gas sensor to the outer component can be efficiently radiated from the outer component to the outside air, and can be efficiently transferred to the internal combustion engine body. it can. Therefore, since it can further suppress that an outer side component becomes high temperature, it can prevent more reliably that the gas sensor attached to this exceeds heat-resistant temperature.

  Furthermore, the sensor mounting member according to any of the above may be a sensor mounting member having a cooling fin portion for cooling itself.

  The sensor mounting member of the present invention has a cooling fin portion for cooling itself. For this reason, the heat transmitted from the exhaust gas flowing through the communication passage to the sensor mounting member and the heat transmitted from the gas sensor attached to the sensor mounting member to the sensor mounting member can be efficiently radiated to the outside air through the cooling fin portion. Therefore, since it can further suppress that the member for sensor attachment becomes high temperature, it can prevent more reliably that the gas sensor attached to this exceeds heat-resistant temperature.

  Further, the sensor mounting member according to any one of the above, wherein the sensor mounting member is configured to be mounted in the exhaust port portion of the internal combustion engine body by changing a direction in a circumferential direction of the exhaust port. And good.

In attaching the sensor mounting member to the internal combustion engine main body and the exhaust pipe, the internal structure of the internal combustion engine main body and the exhaust pipe, the mounting space of the gas sensor, etc. There may be cases where it is unavoidable to use a dedicated sensor mounting member defined according to the main body and exhaust pipe. If it does so, it will be necessary to prepare many types of members for sensor attachment according to the kind of internal combustion engine main body, an installation form, etc., and will also raise a cost.
On the other hand, the sensor mounting member of the present invention is configured to be mounted on the exhaust port portion of the internal combustion engine body by changing the direction along the circumferential direction of the exhaust port. For this reason, even if the type and installation form of the internal combustion engine body are different, it is sufficient to prepare one or a few types of sensor mounting members, and the sensor mounting member and the gas sensor can be mounted to the internal combustion engine body in an appropriate posture. it can.
In addition, as a specific form that can be mounted by changing the direction in the circumferential direction of the exhaust port, a plurality of mounting holes arranged in the circumferential direction are provided in the sensor mounting member, or an elongated shape along the circumferential direction is provided. For example, a mounting hole may be provided.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a scooter type motorcycle 900 having an internal combustion engine structure 100 according to the first embodiment. 2 and 3 show the internal combustion engine structure 100 according to the first embodiment.
In the motorcycle 900, a head pipe 903 is formed at the front end of a body frame 901, a front fork 905 is pivotably fitted to the head pipe 903, and a front wheel 907 is rotatably attached to the lower end side of the front fork 905. It has been.

  On the other hand, the internal combustion engine structure 100 is attached to the rear side of the body frame 901. The internal combustion engine structure 100 includes a single-cylinder water-cooled internal combustion engine body 110, an exhaust pipe 120, and the like. In addition, a power transmission device 911 and a rear wheel support portion 913 are attached to the internal combustion engine main body 110, and a rear wheel 915 is rotatably attached to the rear wheel support portion 913. A rear suspension 917 is attached between the rear portion of the vehicle body frame 901 and the rear wheel support portion 913. A seat 921 is provided at the upper rear part of the body frame 901. A fuel tank 925 is disposed below the step floor 923 at the center of the vehicle body. The body frame 201 is covered with a body cover 927.

  Among these, the internal combustion engine structure 100 will be described in detail. As shown in FIGS. 2 and 3, the internal combustion engine structure 100 includes an internal combustion engine main body 110, an exhaust pipe 120, and a sensor attachment member 130 interposed therebetween. A gas sensor (oxygen sensor) 190 having a sensor portion 190 s for detecting a specific gas component in the exhaust gas is attached to the sensor attachment member 130. Further, a first gasket 170 is interposed between the internal combustion engine body 110 and the sensor mounting member 130, and a second gasket 180 is interposed between the sensor mounting member 130 and the exhaust pipe 120. .

  The internal combustion engine body 110 has a known structure. That is, the internal combustion engine body 110 has a cylinder block in which a cylinder hole is formed, and a piston is inserted into the cylinder hole. The piston is connected to the crankshaft via a connecting rod. A cylinder head is coupled to the cylinder block, and a combustion chamber is formed therein. The cylinder head is provided with an intake valve and an exhaust valve. The intake valve and the exhaust valve are configured to be opened and closed by a valve operating device disposed in a valve operating chamber formed between a cylinder head and a head cover attached thereto. The internal combustion engine main body 110 is provided with an intake port, to which an intake pipe is connected, and further, a fuel injection valve, a throttle valve, and an air cleaner are connected. The internal combustion engine main body 110 is provided with an exhaust port portion 111 including an exhaust port 112, and an exhaust pipe 120 including a muffler is connected to the exhaust port portion 111 via a sensor mounting member 130.

  Next, the sensor mounting member 130 will be described. FIG. 4 shows the sensor mounting member 130 according to the first embodiment. The sensor mounting member 130 is integrally formed from a metal (specifically, aluminum), and has a first surface 130b whose outer shape is an elliptical shape, and a second surface 130c that is the back surface and has the same elliptical shape as the outer shape. The third surface 130d is a curved surface connecting the outer edges of the first surface 130b and the second surface 130c. At the center of the first surface 130b and the second surface 130c, a through hole (communication path) 131 is provided to penetrate between the first surface 130b and the second surface 130c. Exhaust gas flows through the through hole 131 during use.

In addition, in order to attach the gas sensor 190 to the predetermined position of the third surface 130d of the sensor attachment member 130, a sensor attachment hole 133h communicating with the through hole 131 is formed, and the inner periphery of the sensor attachment hole 133h is formed. A sensor mounting portion 133 having a screw portion on the surface is provided. When the gas sensor 190 is inserted into the sensor mounting hole 133h from the tip (see FIG. 3) side which is the sensor portion 190s, and the gas sensor 190 is mounted on the sensor mounting portion 133, the sensor portion 190s of the gas sensor 190 is disposed in the through hole 131. The
In addition, the sensor mounting member 130 has a circular cross-section that penetrates between the first surface 130b and the second surface 130c at predetermined positions on both sides of the through hole 131 of the first surface 130b and the second surface 130c. Mounting holes 135, 135 are provided.

As shown in FIG. 3, the exhaust port portion 111 of the internal combustion engine main body 110 is provided with two male screw portions 113, 113 protruding in a rod shape.
Further, the first gasket 170 has a plate shape with an elliptical outer shape, a first hole 171 through which exhaust gas passes is provided at the center, and the male screw of the internal combustion engine main body 110 at predetermined positions on both sides thereof. Two second holes 173 and 173 into which the portions 113 and 113 are inserted are provided. The first gasket 170 is made of metal (specifically, stainless steel).

The second gasket 180 has the same shape as the first gasket 170, has an elliptical outer plate shape, is provided with a first hole 181 through which exhaust gas passes in the center, and is formed on both sides thereof. Two second holes 183 and 183 through which the male screw portions 113 and 113 of the internal combustion engine main body 110 are inserted are provided at predetermined positions. Unlike the first gasket 170, the second gasket 180 is made of a material (specifically, graphite or carbon) having lower thermal conductivity than the first gasket 170.
The exhaust pipe 120 circulates exhaust gas during use and discharges the exhaust gas to the outside. The exhaust pipe 120 has an inlet portion 121 including an inlet 122 into which exhaust gas is introduced. The introduction port portion 121 is provided with two second holes 123 and 123 into which the male screw portions 113 and 113 of the internal combustion engine main body 110 are inserted. The exhaust pipe 120 is made of iron or stainless steel.

  A sensor mounting member 130 is interposed between the exhaust port portion 111 of the internal combustion engine main body 110 and the introduction port portion 121 of the exhaust pipe 120. Further, a first gasket 170 is interposed between the exhaust port portion 111 and the sensor mounting member 130, and a second gasket 180 is interposed between the sensor mounting portion member 130 and the introduction port portion 121. Intervene. Thereby, the exhaust port 112 of the internal combustion engine 110, the first hole 171 of the first gasket 170, the through hole 131 of the sensor mounting member 130, the second hole 181 of the second gasket 180, and the introduction of the exhaust pipe 120 are introduced. Since the port 122 is connected, exhaust gas can be circulated through them.

  In the second holes 173 and 173 of the first gasket 170, the mounting holes 135 and 135 of the sensor mounting member 130, the second holes 183 and 183 of the second gasket, and the second holes 123 and 123 of the exhaust pipe 120, Male thread portions 113 of the internal combustion engine main body 110 are inserted. Then, nuts 129 and 129 (see FIG. 2) are screwed into these male screw portions 113 and 113, so that the exhaust port portion 111 of the internal combustion engine main body 110, the first gasket 170, and the gas sensor 190 are attached. The mounting member 130, the second gasket 180, and the inlet 121 of the exhaust pipe 120 are fixed to each other to constitute the internal combustion engine structure 100.

As described above, in the internal combustion engine structure 100, the sensor attachment member 130 is interposed between the exhaust port portion 111 of the internal combustion engine body 110 and the introduction port portion 121 of the exhaust pipe 120. The gas sensor 190 is attached to the sensor attachment portion 133 of the sensor attachment member 130.
As described above, in the first embodiment, the gas sensor 190 is not directly attached to the internal combustion engine main body, but is attached to the separately prepared sensor attachment member 130. It does not have to be formed. Further, in order to secure a space for attaching the gas sensor 190 to the internal combustion engine body 110, it is not necessary to consider the form of the internal combustion engine body 110 or the gas sensor 190.

Further, since the sensor mounting member 130 is interposed between the internal combustion engine main body 110 and the exhaust pipe 120, the exhaust gas flowing through the through hole 131 of the sensor mounting member 130 is sufficiently hot. For this reason, the activation time of the gas sensor 190 can be sufficiently shortened.
In addition, heat transferred from the exhaust gas flowing through the through-hole 131 to the sensor mounting member 130 and heat transferred from the gas sensor 190 to the sensor mounting member 130 can be dissipated from the sensor mounting member 130 to the outside air and cooled. It can be transmitted to the internal combustion engine main body 110 cooled by water or engine oil. For this reason, since it can suppress that the member 130 for sensor attachment becomes high temperature, it can prevent that the gas sensor 190 attached to this exceeds heat-resistant temperature.

  In particular, in the first embodiment, the sensor mounting member 130 is made of a material having higher thermal conductivity than the material constituting the inlet port 121 of the exhaust pipe 120. When the internal combustion engine body 100 is used, heat is transmitted from the exhaust gas flowing through the through hole 131 of the sensor mounting member 130 to the sensor mounting member 130, and heat is transmitted from the gas sensor 190 to the sensor mounting member 130. However, compared to the case where the sensor mounting member 130 is formed using a material having the same degree as or lower than that of the material constituting the inlet 120 of the exhaust pipe 120, the above heat is The sensor mounting member 130 can efficiently radiate heat to the outside air, and can be efficiently transmitted to the internal combustion engine body 110. For this reason, since it can suppress more effectively that the member 130 for sensor attachment becomes high temperature, it can prevent more reliably that the gas sensor 190 exceeds heat-resistant temperature.

  Further, in the first embodiment, the first gasket 170 disposed between the exhaust port portion 111 and the sensor mounting member 130 is replaced with the second gasket 180 disposed between the sensor mounting member 130 and the introduction port portion 121. It is made of a material having a higher thermal conductivity than the material constituting the. For this reason, the heat transmitted from the exhaust gas flowing through the through hole 131 of the sensor mounting member 130 to the sensor mounting member 130 or the heat transmitted from the gas sensor 190 to the sensor mounting member 130 is high in heat conductivity. Through the gasket 170, the internal combustion engine main body 110 cooled with cooling water or engine oil can be efficiently transmitted. On the other hand, since the second gasket 180 has low thermal conductivity, heat from the exhaust pipe 120 in a high temperature state can be prevented from being transmitted to the sensor mounting member 130 through the second gasket 180. Thereby, since it can suppress more effectively that the member 130 for sensor attachment becomes high temperature, it can prevent more reliably that the gas sensor 190 exceeds heat-resistant temperature.

(Embodiment 2)
Next, a second embodiment will be described. Note that the description of the same parts as those in the first embodiment is omitted or simplified. FIG. 5 shows a sensor mounting member 230 according to the second embodiment. The internal combustion engine structure 200 according to the second embodiment is different from the first embodiment in the form of a sensor mounting member 230. The rest is the same as in the first embodiment.

  The sensor mounting member 230 of the second embodiment is integrally formed of metal (specifically, aluminum), and has a first surface 230b whose outer shape is an elliptical shape, and a first surface 230b that has this back surface and has the same elliptical shape. A second surface 230c, and a third surface 230d formed of a curved surface connecting the outer edges of the first surface 230b and the second surface 230c. In the center of the first surface 230b and the second surface 230c, a through-hole (communication path) 231 that penetrates these surfaces 230b and 230c is provided. In addition, in order to attach the gas sensor 190 to the predetermined position of the third surface 230d, a sensor attachment hole 233h communicating with the through hole 231 is formed, and a screw portion is provided on the inner peripheral surface of the sensor attachment hole 233h. A sensor mounting portion 233 is provided.

Further, the sensor mounting member 230 has mounting holes 235, 235,... Penetrating through the surfaces 230b, 230c at predetermined positions on both sides of the through hole 21 of the first surface 230b and the second surface 230c. There are 8 pieces in total. These mounting holes 235, 235,... Are formed side by side along the circumferential direction of the through hole 121.
By having such attachment holes 235, 235,..., The sensor attachment member 230 is attached to the exhaust port portion 111 of the internal combustion engine main body 110 while changing the direction in four stages along the circumferential direction of the exhaust port 112. Can do. For this reason, even when the type and installation form of the internal combustion engine body 110 are different, it is sufficient to prepare one or a few types of sensor mounting members 230, and the sensor mounting member 230 and the gas sensor 190 are placed in an appropriate posture. 110 can be attached. In addition, the same parts as those of the first embodiment have the same effects as those of the first embodiment.

(Embodiment 3)
Next, a third embodiment will be described. Note that description of the same parts as those in the first or second embodiment is omitted or simplified. FIG. 6 shows a sensor mounting member 330 according to the third embodiment. The internal combustion engine structure 300 according to the third embodiment is different from the first embodiment in the form of a sensor mounting member 330. The rest is the same as in the first embodiment.

  The sensor mounting member 330 according to the third embodiment is integrally formed of metal (specifically, aluminum), and has a first surface 330b whose outer shape is an elliptical shape, and a first surface 330b that has this back surface and has the same elliptical shape as the outer shape. A second surface 330c, and a third surface 330d formed of a curved surface connecting the outer edges of the first surface 330b and the second surface 330c. At the center of the first surface 330b and the second surface 330c, a through hole (communication path) 331 is provided that penetrates these surfaces 330b and 330c. Further, in order to attach the gas sensor 190 to the predetermined position of the third surface 330d, a sensor attachment hole 333h communicating with the through hole 331 is formed, and a screw portion is provided on the inner peripheral surface of the sensor attachment hole 333h. A sensor mounting portion 333 is provided.

In addition, two mounting holes 335 and 335 penetrating these surfaces 330b and 330c are provided at predetermined positions on both sides of the through-hole 331 in the first surface 330b and the second surface 330c. These mounting holes 335 and 335 are formed elongated along the circumferential direction of the through hole 331.
By having such mounting holes 335 and 335, the sensor mounting member 330 changes its direction to the exhaust port portion 111 of the internal combustion engine body 110 within a range of about 45 degrees along the circumferential direction of the exhaust port 112. Can be attached. For this reason, even when the type and installation form of the internal combustion engine body 110 are different, it is sufficient to prepare one or a few types of sensor mounting members 230, and the sensor mounting member 230 and the gas sensor 190 are placed in an appropriate posture. 110 can be attached. In addition, the same parts as those in the first embodiment have the same effects as those in the first embodiment.

(Embodiment 4)
Next, a fourth embodiment will be described. In addition, description of the part similar to either of the said Embodiments 1-3 is abbreviate | omitted or simplified. FIG. 7 shows a sensor mounting member 430 according to the fourth embodiment. In the internal combustion engine structure 400 according to the fourth embodiment, the sensor mounting member 430 is different from the first embodiment. The rest is the same as in the first embodiment.

The sensor mounting member 430 of the fourth embodiment is made of metal (specifically, aluminum), and the mounting member main body portion 432 and the cooling fin portion 437 are integrally formed.
The mounting member main body 432 has a first surface 430b whose outer shape is an elliptical shape, a second surface 430c which is the back surface and has the same elliptical outer shape, and a curved surface connecting the outer edges of the first surface 430b and the second surface 430c. And a third surface 430d. At the center of the first surface 430b and the second surface 430c, a through-hole (communication path) 431 that penetrates these surfaces 430b and 430c is provided. Further, in order to attach the gas sensor 190 to the predetermined position of the third surface 430d, a sensor attachment hole 433h communicating with the through hole 431 is formed, and a screw portion is provided on the inner peripheral surface of the sensor attachment hole 433h. A sensor mounting portion 433 is provided. In addition, two mounting holes 435 and 435 penetrating these surfaces 430b and 430c are provided at predetermined positions on both sides of the through-hole 431 on the first surface 430b and the second surface 430c.

The cooling fin portion 437 is provided on the third surface 430 d of the mounting member main body portion 432 so as to avoid the sensor mounting portion 433. The cooling fin portion 437 includes a plurality of cooling fins provided along the circumferential direction of the third surface 430d.
By having such a cooling fin portion 437, the heat transmitted from the exhaust gas flowing through the through hole 431 of the sensor mounting member 430 to the sensor mounting member 430 during use, the sensor mounting member 430 from the gas sensor 190, Heat can be efficiently radiated to the outside through the cooling fin portion 437. Therefore, since it can suppress more effectively that the member 430 for sensor attachment becomes high temperature, it can prevent more reliably that the gas sensor 190 attached to this exceeds heat-resistant temperature. In addition, the same parts as those in the first embodiment have the same effects as those in the first embodiment.

(Embodiment 5)
Next, a fifth embodiment will be described. In addition, description of the part similar to any of the said Embodiment 1-4 is abbreviate | omitted or simplified. FIG. 8 shows a sensor mounting member 530 according to the fifth embodiment. The internal combustion engine structure 500 of the fifth embodiment is different from the first embodiment in the form of a sensor mounting member 530. Other than that, it is basically the same as the first embodiment.

The sensor mounting member 530 according to the fifth embodiment includes a communication path component 532 and an outer component 536, which will be described later, a first surface 530b having a circular outer shape, and a circular shape that is the back surface of the first surface 530b. It has the 2nd surface 530c, and the 3rd surface 530d which consists of a curved surface which connects the outer edge of the 1st surface 530b and the 2nd surface 530c.
At the center of the first surface 530b and the second surface 530c, a through-hole (communication path) 531 that penetrates these surfaces 530b and 530c is provided. The communication path component 532 has a cylindrical shape having the through hole 531. The communication path component 532 is made of a metal (specifically, iron or stainless steel) having lower thermal conductivity than the material constituting the outer component 536.

  The periphery of the communication path constituting portion 532 has a cylindrical shape and is surrounded by an outer constituting portion 536 that forms the third surface 530d and is exposed to the outside. In order to attach the gas sensor 190 to the predetermined position of the third surface 530d of the outer component 536, a sensor attachment hole 533h communicating with the through hole 531 is formed, and the inner peripheral surface of the sensor attachment hole 533h A sensor mounting portion 533 having a screw portion is provided. The outer constituent part 536 has a higher thermal conductivity than the material constituting the communication path constituting part 532 and has a higher thermal conductivity than the material constituting the inlet part 121 of the exhaust pipe 120 (specifically, Is made of aluminum. The outer component 536 is connected to the exhaust port 111 of the internal combustion engine body 110 via the first gasket 170.

  In the sensor mounting member 530 having such a configuration, the communication path constituting portion 532 is made of a material having a lower thermal conductivity than the material constituting the outer constituting portion 536 and has a low thermal conductivity. It is possible to suppress heat from being transmitted from the exhaust gas to the outer constituent part 536 via the communication path constituent part 532. On the other hand, the thermal conductivity of the outer component 536 is higher than that of the material constituting the communication path component 532 and the inlet port 121 of the exhaust pipe 120. Therefore, heat transmitted from the communication path component 532 to the outer component 536 and heat transmitted from the gas sensor 190 to the outer component 536 can be efficiently radiated from the outer component 536 to the outside air, and the internal combustion engine body 110 Can communicate efficiently. Therefore, since it can suppress further that the outer side structure part 536 becomes high temperature, it can prevent more reliably that the gas sensor 190 attached to this exceeds heat-resistant temperature.

  Further, in the predetermined positions on both sides of the through hole 531 in the first surface 530b and the second surface 530c, three attachment holes 535, 535,. It has been. By having such mounting holes 535, 535,..., The sensor mounting member 530 is mounted on the exhaust port portion 111 of the internal combustion engine main body 110 in three stages along the circumferential direction of the exhaust port 112. be able to. For this reason, even if the type and installation form of the internal combustion engine main body 110 are different, it is sufficient to prepare one or a few types of sensor mounting members 530, and the sensor mounting member 530 and the gas sensor 190 are properly positioned in the internal combustion engine main body. 110 can be attached. In addition, the same parts as those in the first embodiment have the same effects as those in the first embodiment.

(Embodiment 6)
Next, a sixth embodiment will be described. In addition, description of the part similar to any of the said Embodiment 1-5 is abbreviate | omitted or simplified. FIG. 9 shows a sensor mounting member 630 according to the sixth embodiment. The internal combustion engine structure 600 according to the sixth embodiment is different from the first embodiment in the form of a sensor mounting member 630. Other than that, it is basically the same as the first embodiment.

  The sensor mounting member 630 of the sixth embodiment is integrally formed from a metal (specifically, aluminum), and has a first surface 630b having a circular outer shape, and a first surface 630b having a back surface and the same outer shape. A second surface 630c, and a third surface 630d formed of a curved surface connecting the outer edges of the first surface 630b and the second surface 630c. At the center of the first surface 630b and the second surface 630c, a through-hole (communication path) 631 that penetrates these surfaces 630b and 630c is provided. Further, in order to attach the gas sensor 190 to the predetermined position of the third surface 630d, a sensor attachment hole 633h communicating with the through hole 631 is formed, and a screw portion is provided on the inner peripheral surface of the sensor attachment hole 633h. A sensor mounting portion 633 is provided.

  In addition, two mounting holes 635 and 635 penetrating these surfaces 630b and 630c are provided at predetermined positions on both sides of the through-hole 631 in the first surface 630b and the second surface 630c. These mounting holes 635 and 635 are elongated along the circumferential direction of the through-hole 631. By having such long and narrow mounting holes 635, 635,..., The sensor mounting member 630 can reach the exhaust port portion 111 of the internal combustion engine body 110 within a range of about 45 degrees along the circumferential direction of the exhaust port 112. It can be installed in different directions. For this reason, even if the type and installation form of the internal combustion engine main body 110 are different, it is sufficient to prepare one or a few types of sensor mounting members 530, and the sensor mounting member 630 and the gas sensor 190 are placed in an appropriate posture. 110 can be attached. In addition, the same parts as those in the first embodiment have the same effects as those in the first embodiment.

  In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described first to sixth embodiments, and can be appropriately modified and applied without departing from the gist thereof. Not too long.

1 is an explanatory view showing a scooter type motorcycle having an internal combustion engine structure according to Embodiment 1. FIG. 1 is a perspective view of an internal combustion engine structure according to Embodiment 1. FIG. 1 is an exploded perspective view of an internal combustion engine structure according to Embodiment 1. FIG. 3 is a perspective view of a sensor mounting member according to Embodiment 1. FIG. 6 is a perspective view of a sensor mounting member according to Embodiment 2. FIG. 6 is a perspective view of a sensor mounting member according to Embodiment 3. FIG. It is a perspective view of the member for sensor attachment concerning Embodiment 4. 10 is a perspective view of a sensor mounting member according to Embodiment 5. FIG. It is a perspective view of the member for sensor attachment concerning Embodiment 6.

Explanation of symbols

100, 200, 300, 400, 500, 600 Internal combustion engine structure 110 Internal combustion engine main body 111 Exhaust port 112 Exhaust port 120 Exhaust pipe 121 Inlet port 122 Inlet port 130, 230, 330, 430, 530, 630 Sensor mounting member 131,231,331,431,531,631 through hole (communication path)
133, 233, 333, 433, 533, 633 Sensor mounting portion 170 First gasket 180 Second gasket 190 Gas sensor (oxygen sensor)
190s sensor part 432 mounting member main body part 437 cooling fin part 532 communication path constituting part 536 outer constituting part 900 motorcycle

Claims (12)

An internal combustion engine body having an exhaust port portion including an exhaust port for discharging exhaust gas;
An exhaust port including an inlet port through which the exhaust gas is introduced, and an exhaust pipe through which the exhaust gas flows and exhausts the exhaust gas to the outside;
A gas sensor having a sensor unit for detecting a specific gas component in the exhaust gas;
An internal combustion engine structure comprising:
Interposed between the exhaust port portion of the internal combustion engine body and the introduction port portion of the exhaust pipe,
A communication path connecting the exhaust port and the introduction port;
A sensor mounting portion for mounting the gas sensor and positioning the sensor portion in the communication path;
An internal combustion engine structure comprising a sensor mounting member thermally connected to the exhaust port. An internal combustion engine structure according to claim 1,
The sensor mounting member is an internal combustion engine structure made of a material having a higher thermal conductivity than a material constituting the introduction port portion of the exhaust pipe at any part. An internal combustion engine structure according to claim 1,
The sensor mounting member is:
A communication path constituting part forming the communication path;
An outer component that surrounds the periphery of the communication path component and is exposed to the outside, is thermally connected to the exhaust port of the internal combustion engine body, and is provided with the sensor mounting portion. ,
The communication path component is an internal combustion engine structure made of a material having lower thermal conductivity than a material constituting the outer component. An internal combustion engine structure according to claim 3,
The external structure is an internal combustion engine structure made of a material having a higher thermal conductivity than a material constituting the introduction port of the exhaust pipe. An internal combustion engine structure according to any one of claims 1 to 4,
A first gasket interposed between the exhaust port of the internal combustion engine body and the sensor mounting member;
A second gasket interposed between the sensor mounting member and the introduction port portion of the exhaust pipe,
The first gasket is an internal combustion engine structure made of a material having higher thermal conductivity than a material constituting the second gasket. An internal combustion engine structure according to any one of claims 1 to 5,
The sensor mounting member is an internal combustion engine structure having a cooling fin portion for cooling itself. The exhaust port portion of the internal combustion engine body having an exhaust port portion including an exhaust port for exhaust gas exhaust, and an introduction port portion including an introduction port into which the exhaust gas is introduced, and the exhaust gas flows and the It is configured to be interposed between the introduction port portion of the exhaust pipe that discharges exhaust gas to the outside,
A communication path connecting the exhaust port and the introduction port;
A sensor mounting part capable of mounting a gas sensor having a sensor part for detecting a specific gas component in the exhaust gas in a state where the sensor part is located in the communication path;
A sensor mounting member configured to be thermally connectable to the exhaust port. The sensor mounting member according to claim 7,
Each part is a sensor mounting member made of aluminum, aluminum alloy, copper, or copper alloy. The sensor mounting member according to claim 7,
A communication path constituting part forming the communication path;
An outer configuration portion that surrounds the periphery of the communication path configuration portion and is exposed to the outside, is configured to be thermally connectable to the exhaust port portion of the internal combustion engine body, and is provided with the sensor mounting portion. Have
The communication path component is a sensor mounting member made of a material having lower thermal conductivity than the material constituting the outer component. The sensor mounting member according to claim 8,
The outer component part is a sensor mounting member made of aluminum, an aluminum alloy, copper, or a copper alloy. The sensor mounting member according to any one of claims 7 to 10,
A sensor mounting member having a cooling fin portion for cooling itself. The sensor mounting member according to any one of claims 7 to 11,
A sensor mounting member configured to be mounted on the exhaust port portion of the internal combustion engine body by changing a direction in a circumferential direction of the exhaust port.

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