TWI383093B - Configuration Structure of Oxygen Sensor for Internal Combustion Engine - Google Patents

Description

Configuration structure of oxygen sensor of internal combustion engine

The invention relates to an arrangement structure of an oxygen sensor, in particular to an arrangement structure of an oxygen sensor of an internal combustion engine suitable for a locomotive.

The oxygen-containing sensor used in general internal combustion engines is designed to monitor the exhaust gas emitted by the engine and to provide feedback for combustion control. Usually, the oxygen sensor is installed at the exhaust port of the exhaust pipe near the cylinder head, but due to its The installation position should avoid damage caused by jumping stones or splashes on the road surface, prevent theft, and consider the influence of the installation method on the performance of the oxygen sensor. Therefore, how to install the oxygen sensor in the best position. A difficult subject for the industry.

Most of the conventional techniques place the oxygen sensor on the exhaust pipe, and the oxygen sensor is disposed on the exhaust pipe at a high shielding position or an additional protection component is added to avoid jumping or splashing on the road surface. The water splash causes damage; and the disassembly and assembly of the exhaust pipe is also time consuming, and it is also easy to cause damage to the oxygen sensor due to inadvertent.

In addition, Taiwan Patent Publication No. 200528627 discloses a new oxygen sensor configuration structure in which an oxygen sensor is directly mounted on a side wall surface of a cylinder head which is not provided with an intake and exhaust port to make oxygen sensing The installation position of the device is higher than that installed on the exhaust pipe, relatively far away from the ground, and effectively utilizes components such as a fuel tank and an exhaust pipe to protect the oxygen-containing sensor, and the oxygen pipe does not need to be welded on the exhaust pipe. The sensor's lock holder does not require additional protective components. In addition to reducing the possibility of damage to the oxygen sensor, it also reduces the number and cost of the overall locomotive parts.

However, in the above configuration in which the oxygen sensor is directly mounted to the cylinder head, in order to avoid interference with the cylinder head cam transmission element, the oxygen sensor mounting range is limited to the cylinder head side on the opposite side of the transmission element housing space. Wall. Further, in order to use the exhaust pipe as the protection device for the oxygen sensor, the arrangement is only applicable to an internal combustion engine in which the direction in which the exhaust pipe is bent and the direction in which the transmission element is accommodated is opposite to each other, which is not preferable.

In addition, when the cylinder diameter of the internal combustion engine is increased and the combustion chamber is enlarged, the four holes of the receiving cylinder and the cylinder head fixing screw will be moved outward, so that the oxygen sensor can not be disposed on the side wall surface of the cylinder head. At the same time, the cylinder head is miniaturized. Therefore, the arrangement in which the oxygen sensor is directly mounted to the cylinder head is not ideal, and there is room for improvement.

Because of this, in the spirit of active invention, I thought about the configuration of an oxygen sensor of an internal combustion engine that can solve the above problems, and finally completed the present invention after several research experiments.

The main object of the present invention is to provide an arrangement structure of an oxygen sensor of an internal combustion engine, which can simultaneously achieve a proper protection of the oxygen sensor, reduce the cost for protecting the oxygen sensor, and can be applied to various design types. The configuration of the internal combustion engine.

In order to achieve the above object, the configuration of the oxygen sensor of the internal combustion engine of the present invention comprises: a cylinder, and a cylinder head assembled on the cylinder. The utility model is characterized in that: the cylinder head has an exhaust port extending structure extending from the wall surface of the exhaust port side, and the exhaust port extending structure is configured to connect the front surface of the exhaust pipe with the exhausting direction as a joint surface of the exhaust pipe, and An oxygen-containing sensor mounting hole for mounting an oxygen-containing sensor is disposed on a side wall of the outer periphery of the bonding surface, and the center line of the oxygen sensor mounting hole is substantially perpendicular to the central axis of the exhaust channel.

In other words, in order to ensure that the exhaust passage of the cylinder head can smoothly slide toward the curved extension of the exhaust pipe, the wall surface of the exhaust port side of the cylinder head is extended to become an exhaust port extension structure higher than the sidewall of the cylinder head. As a locking seat surface of the exhaust pipe, the exhaust port extending structure is integrally provided with a mounting hole for the oxygen sensor to be installed and fixed, so that the oxygen sensor is installed on the exhaust port extending substantially in a radial manner. Side wall surface. Therefore, the oxygen-containing sensor mounting position of the present invention can be installed without being restricted by the cylinder head transmission component accommodating space, and can be installed according to the configuration requirements of the overall engine and its peripheral components, so that the cylinder head can be miniaturized and applicable. The configuration of various design types, whether the cylinder is an upright or horizontal type internal combustion engine.

In addition, the oxygen-containing sensor of the present invention is installed in the exhaust pipe to the periphery of the cylinder head, and the oxygen-containing sensor installation position thereof is relatively far away from the road surface, so the protection, the shielding property and the theft difficulty are significantly improved. Safety requirements can be achieved without the need for additional protective components. Moreover, when it is necessary to disassemble the exhaust pipe, it is not necessary to remove the oxygen sensor, which simplifies the unnecessary disassembly process and prevents the oxygen sensor from being damaged due to disassembly and assembly. In addition, the exhaust pipe does not need to be welded with a lock for the oxygen sensor, which can reduce the overall number of parts and reduce the manufacturing difficulty and cost.

In addition, the direction in which the center line of the oxygen-containing sensor mounting hole extends outward from the inside of the exhaust passage is defined as the installation direction of the oxygen sensor, and the horizon of the midpoint of the exhaust port of the joint surface is defined as a horizontal line. Wherein, the installation direction of the oxygen sensor can be higher than the horizontal line, thereby not only utilizing the exhaust pipe as a protection device for the oxygen sensor, but also the installation hole of the oxygen sensor has drainage property to avoid moisture condensation. Between the oxygen sensor and the mounting hole to avoid damage to the oxygen sensor.

Furthermore, the outer wall of the outer surface of the joint surface may be provided with two locking holes for the exhaust pipe to be locked, and the two locking holes may be located on opposite sides of the exhaust port of the joint surface, and The line connecting the midpoint of the exhaust port of the joint surface and perpendicular to the two lock attachment holes is defined as the exhaust port offset direction line. Wherein, the angle between the installation direction of the oxygen sensor and the deviation direction line of the exhaust port is not more than ninety degrees, thereby fully utilizing the space of the extension structure of the exhaust port, and achieving a proper setting with a shorter extension structure height The necessary space for the oxygen sensor, and further the design of the cylinder head miniaturization.

Moreover, the cylinder head and the exhaust port extension structure may be an integral structure or a two-piece structure, and may be assembled and fixed into an integrated structure.

Please refer to FIG. 1, FIG. 2, and FIG. 3, which are side views of a side view of an internal combustion engine and a cross-sectional view of a cylinder head exhaust port joint surface according to a preferred embodiment of the present invention. The configuration of the embodiment includes a cylinder 10, a cylinder head 20, and a cylinder head cover 22.

As shown, the cylinder head 20 is assembled on the cylinder 10, and the cylinder head cover 22 is attached to the cylinder head 20. The cylinder head 20 has an exhaust port extension 21 extending from the wall surface of the exhaust port 201 side. The exhaust port extending structure 21 has a front surface of the normal direction of the exhaust gas as a joint surface 211 of the exhaust pipe 25, and an outer surface of the outer surface of the joint surface 211 is provided with an oxygen sensor. 30 Mounting the fixed oxygen sensor mounting hole, the oxygen sensor mounting hole center line I is substantially perpendicular to the exhaust channel center axis O.

As shown in FIG. 2, the direction in which the oxygen sensor mounting hole center line I extends outward from the inside of the exhaust passage is defined as the oxygen sensor mounting direction (overlap with the oxygen sensor mounting hole center line I), and the combination The horizon of the midpoint of the exhaust port 201 of the face 211 is defined as a horizontal line H, and the oxygen sensor is mounted in a direction higher than the horizontal line H. Thereby, not only the exhaust pipe 25 can be used as the protection device of the oxygen sensor 30, but also the installation hole of the oxygen sensor 30 has drainage property to prevent moisture condensation from remaining between the oxygen sensor 30 and the mounting hole. In order to avoid damage to the oxygen sensor 30.

As shown in FIG. 3, the outer peripheral wall of the outer surface of the joint surface 211 is provided with two locking holes 213 for the exhaust pipe 25 to be locked. The two locking holes 213 are located at the row of the joint surface 211. The opposite sides of the air port 201, and the line passing through the midpoint of the exhaust port 201 of the joint surface 211 and perpendicular to the two lock attachment holes 213 is defined as the exhaust port offset direction line S, and the oxygen sensor is installed. The angle β between the direction and the exhaust line offset direction line S does not exceed ninety degrees. In the present embodiment, the cylinder head 20 and the exhaust port extension structure 21 are of a unitary structure.

Therefore, in this embodiment, in order to ensure that the exhaust passage of the cylinder head 20 can smoothly slide toward the curved extension of the exhaust pipe 25, the wall surface of the exhaust port side of the cylinder head 20 is extended to be higher than the sidewall of the cylinder head. The exhaust port extending structure 21 serves as a locking seat surface of the exhaust pipe 25, and the exhaust port extending structure 21 is further provided with a mounting hole for fixing the oxygen containing sensor 30, so that the oxygen containing sensor 30 is substantially radial The method is mounted on the side wall surface of the exhaust port extension structure 21. Therefore, the installation position of the oxygen sensor 30 of the present embodiment is not limited by the storage space of the cylinder head transmission component, and can be installed according to the configuration requirements of the overall engine and its peripheral components, so that the cylinder head 20 can be miniaturized, and It can be applied to various design types of configurations, regardless of whether the cylinder is an upright or horizontal type internal combustion engine.

In addition, the oxygen sensor 30 of the present embodiment is installed in the exhaust pipe to the periphery of the cylinder head, and the installation position of the oxygen sensor 30 is relatively far away from the road surface, so the degree of protection, shielding and theft is difficult. Significantly improved, safety requirements can be achieved without the need for additional protective components. Moreover, when the exhaust pipe 25 needs to be disassembled, the oxygen sensor 30 is not required to be removed, the unnecessary disassembly process can be simplified, and the oxygen sensor 30 can be prevented from being damaged due to disassembly and disassembly. In addition, the exhaust pipe 25 does not need to be welded to the lock holder of the oxygen sensor, which can reduce the number of parts and reduce the manufacturing difficulty and cost.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

10. . . cylinder

20. . . Cylinder head

201. . . exhaust vent

twenty one. . . Exhaust port extension structure

211. . . Joint surface

213. . . Locking hole

twenty two. . . Cylinder head cover

25. . . exhaust pipe

30. . . Oxygen sensor

H. . . Horizontal line

I. . . Mounting hole center line

O. . . Exhaust channel center axis

S. . . Exhaust port offset direction

β. . . Angle

1 is a side elevational view of a portion of an internal combustion engine in accordance with a preferred embodiment of the present invention.

2 is a side elevational view of the coupling face of the cylinder head vent of a preferred embodiment of the present invention.

Figure 3 is another side view of the cylinder head vent junction in accordance with a preferred embodiment of the present invention.

10. . . cylinder

20. . . Cylinder head

twenty one. . . Exhaust port extension structure

twenty two. . . Cylinder head cover

25. . . exhaust pipe

30. . . Oxygen sensor

I. . . Mounting hole center line

O. . . Exhaust channel center axis

Claims (5)

An arrangement structure of an oxygen sensor of an internal combustion engine, comprising: a cylinder; and a cylinder head disposed on the cylinder; wherein the cylinder head has an exhaust port extension structure extending from a wall surface of the exhaust port side The exhaust port extending structure has a front surface of the normal direction of the exhaust gas as a joint surface connecting the exhaust pipe, and a side wall covering the outer periphery of the joint surface is provided with an oxygen sensor mounted and fixed. An oxygen sensor mounting hole, the center line of the oxygen sensor mounting hole is substantially perpendicular to the center axis of the exhaust channel. The configuration of an oxygen sensor of an internal combustion engine according to claim 1, wherein a direction in which the center line of the oxygen sensor mounting hole extends outward from the inside of the exhaust passage is defined as an oxygen sensor mounting direction, and The horizon of the midpoint of the exhaust port of the joint surface is defined as a horizontal line, and the oxygen sensor is installed in a direction higher than the horizontal line. The configuration of the oxygen sensor of the internal combustion engine of claim 1, wherein the outer wall of the outer surface of the joint surface is provided with two locking holes for the exhaust pipe to be locked, the two locks. The attachment holes are located on opposite sides of the exhaust port of the joint surface. The configuration of the oxygen sensor of the internal combustion engine according to claim 3, wherein the line connecting the midpoint of the exhaust port of the joint surface and perpendicular to the two lock holes is defined as the exhaust line offset direction line. The angle between the installation direction of the oxygen sensor and the deviation direction line of the exhaust port is not more than ninety degrees. The configuration of an oxygen sensor of an internal combustion engine according to claim 1, wherein the cylinder head and the exhaust port extension structure are a unitary structure.