JP7148560B2 - Sensor boss and sensor boss mounting structure - Google Patents

Description

The present disclosure relates to a sensor boss and a mounting structure for the sensor boss.

Sensors for measuring temperature, pressure, oxygen concentration, etc. are arranged in an exhaust gas flow path of an internal combustion engine. These sensors are attached to the piping by being fixed to sensor bosses welded to the piping.

The sensor boss must be welded to the pipe along its entire periphery. However, if another component such as a flange is arranged near the welding position of the sensor boss, the welding torch used for welding the sensor boss interferes with the other component.

Therefore, a sensor boss having a shape that allows welding from the radial direction of the pipe (that is, the direction parallel to the normal to the outer peripheral surface of the pipe) has been devised (see Patent Document 1).

JP 2009-228645 A

In the above publication, it is said that interference between the welding torch and other parts can be avoided by inserting the welding torch from the radial direction of the pipe. However, if the welding torch is applied to the sensor boss in the radial direction of the pipe, there is a risk that the welding quality of the sensor boss cannot be ensured due to insufficient penetration on the pipe side.

An object of one aspect of the present disclosure is to provide a sensor boss that can improve welding quality while avoiding interference with other parts of the welding torch.

One aspect of the present disclosure is a sensor boss for mounting a sensor in an exhaust gas flow path of an internal combustion engine. The sensor boss includes a cylindrical body configured to secure the sensor and a collar coupled to one end of the body. The flange has a central portion located inside the outer peripheral surface of the main body when viewed in a direction parallel to the central axis of the main body, and a protruding portion that protrudes radially outward from the main body from the central portion. The radius of curvature at the tip of the protrusion when viewed in a direction parallel to the central axis of the main body is smaller than the radius of the main body.

According to such a configuration, since the protruding portion of the flange has a sharp tip, the side surface of the protruding portion can be welded with a welding torch that is tilted with respect to the normal to the outer peripheral surface of the pipe. The tip of the part can be welded.

That is, even if the welding torch is not moved so as to abut against the tip of the protrusion, the entire periphery of the flange can be welded with the welding torch in an inclined position with a large amount of penetration. Therefore, by arranging the sensor boss so that the protruding portion approaches other parts that are arranged close to the sensor boss, it is possible to improve welding quality while avoiding interference between the welding torch and other parts. .

Another aspect of the present disclosure is a pipe configured to allow the exhaust gas of an internal combustion engine to flow, the sensor boss as a first sensor boss disposed on the outer peripheral surface of the pipe, and the outer peripheral surface or end of the pipe. and a piping component arranged in a part of the sensor boss mounting structure. The collar portion is welded to the outer peripheral surface of the pipe in an orientation in which the projecting portion is arranged between the central portion and the pipe component.

According to such a configuration, it is possible to obtain an exhaust gas flow path in which the first sensor boss and the piping component are arranged close to each other while ensuring the welding quality of the sensor boss.

One aspect of the present disclosure may include, as the piping component, a second sensor boss for attaching a sensor other than the sensor to the piping. According to such a configuration, a plurality of sensors can be arranged close to the exhaust gas flow path.

In one aspect of the present disclosure, the second sensor boss may comprise a tubular body configured to secure another sensor. The central axis of the main body portion of the second sensor boss may be parallel to the central axis of the main body portion of the first sensor boss. When viewed from the axial direction of the main body of the first sensor boss, the tangential line of the outer peripheral edge of the first sensor boss other than the tip of the projecting portion is the central axis of the main body of the first sensor boss and the second sensor boss. may be parallel to or intersect with an imaginary straight line connecting the central axis of the main body of the According to such a configuration, it is possible to improve the welding quality of the first sensor boss while avoiding interference between the welding torch and the second sensor boss.

1A is a schematic perspective view of a sensor boss mounting structure in an embodiment, FIG. 1B is a schematic plan view of the sensor boss mounting structure of FIG. 1A, and FIG. 1C is a schematic plan view of FIG. 2 is a schematic side view of the mounting structure of the sensor boss in FIG. 2A is a schematic perspective view of the sensor boss in the embodiment, FIG. 2B is a schematic plan view of the sensor boss in FIG. 2A, and FIG. 2C is a schematic diagram of the sensor boss in FIG. 2A. FIG. 2D is a schematic front view of the sensor boss in FIG. 2A, and FIG. 2E is a partially enlarged view of the tip of the protrusion in the sensor boss in FIG. 2A. FIG. 3A is a schematic cross-sectional view taken along line IIIA-IIIA of FIG. 2D, and FIG. 3B is a schematic cross-sectional view showing the sensor attached to the sensor boss. 4A is a schematic perspective view of a sensor boss mounting structure in an embodiment different from FIG. 1A, and FIG. 4B is a schematic plan view of the sensor boss mounting structure of FIG. 4A. 4C is a schematic side view of the sensor boss mounting structure of FIG. 4A. 5A, 5B, 5C and 5D are schematic plan views of a sensor boss in an embodiment different from that of FIG. 2A.

Embodiments to which the present disclosure is applied will be described below with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
A sensor boss mounting structure 100 shown in FIGS.

<Piping>
The pipe 2 is configured so that the exhaust gas of the internal combustion engine flows inside. The internal combustion engine to which the pipe 2 is connected is not particularly limited, but an example is a diesel engine. Examples of diesel engines include those used for driving or generating power in transportation equipment such as automobiles, railroads, ships, and construction machinery, and power generation facilities.

<Piping parts>
The first piping component 3 is arranged on the outer peripheral surface of the piping 2 . The first piping component 3 of this embodiment is a bracket for fixing other members to the piping 2 . The first piping component 3 is joined to the outer peripheral surface of the piping 2 by, for example, welding.

The second piping component 4 is arranged at the end of the piping 2 . The second piping component 4 of this embodiment is a flange for connecting the piping 2 to another piping or the like. The second piping component 4 is joined to the end of the piping 2 by welding, for example. The second piping component 4 protrudes radially outward of the piping 2 from the piping 2 . The second piping component 4 is arranged, together with the first piping component 3 , so as to sandwich the first sensor boss 1 , which will be described later, in the axial direction of the pipe 2 .

<Boss for sensor>
The first sensor boss 1 is a member for attaching a sensor to the exhaust gas flow path of the internal combustion engine, which is formed by the pipe 2 .

The sensor attached to the first sensor boss 1 measures the temperature, pressure, components (for example, oxygen, NOx, PM), etc. of the exhaust gas.
The first sensor boss 1 includes a body portion 11 and a collar portion 12 as shown in FIGS. 2A, 2B, 2C, 2D and 3A.

The body portion 11 is a hollow cylindrical portion. A main body S1 of the sensor S is inserted into and fixed to the main body 11 as shown in FIG. 3B. The body portion 11 protrudes radially outward from the pipe 2 while the first sensor boss 1 is fixed to the pipe 2 . Further, the central axis P1 of the body portion 11 is parallel to the radial direction of the pipe 2 .

The collar portion 12 is connected to one end of the body portion 11 (that is, the end closer to the pipe 2). The flange portion 12 is welded to the outer peripheral surface of the pipe 2 . The collar portion 12 is formed integrally with the body portion 11 .

The flange portion 12 is a plate-like portion having an opening in the center through which the rod-like tip portion S2 of the sensor S is inserted. As shown in FIGS. 2C and 2D , the collar portion 12 curves along the outer peripheral surface of the pipe 2 .

The collar portion 12 has a central portion 12A, a first projecting portion 12B, a second projecting portion 12C, a first connecting portion 12D, and a second connecting portion 12E.

The central portion 12A is a portion located inside the outer peripheral surface of the main body portion 11 when viewed from a direction parallel to the central axis P1 of the main body portion 11 (that is, when viewed from the radial direction of the pipe 2). The central portion 12A has an annular shape in plan view.

As shown in FIG. 3A, the central portion 12A includes a first region 121 overlapping the main body portion 11 in a direction parallel to the central axis P1, and a second region 122 located inside the inner peripheral surface of the main body portion 11. have. In the second region 122, the surface (that is, the upper surface) on the side closer to the body portion 11 is tapered so that the thickness of the central portion 12A becomes smaller toward the radially inner side of the body portion 11. As shown in FIG.

The first protruding portion 12B is a portion that protrudes radially outward from the main body portion 11 from the central portion 12A. In the present embodiment, the projecting direction of the first projecting portion 12B is the direction from the first sensor boss 1 toward the first piping component 3 (see FIG. 1B). The first projecting portion 12</b>B is a portion of the first sensor boss 1 that is closest to the first piping component 3 . The first projecting portion 12B is arranged between the central portion 12A and the first piping component 3 .

A radius of curvature R2 (see FIG. 2E) at the tip 123 of the first projecting portion 12B when viewed in a direction parallel to the central axis P1 of the main body 11 is smaller than the radius R1 of the main body 11 (see FIG. 2C). Here, the radius R1 of the body portion 11 means 1/2 of the outer diameter of the body portion 11 .

Note that the tip 123 of the first projecting portion 12B does not have to be curved. That is, the tip 123 of the first protrusion 12B may be a point where straight lines or curved lines are discontinuously connected. If the tip 123 of the first protrusion 12B is a discontinuous point, the radius of curvature at the tip 123 of the first protrusion 12B is zero.

The curvature radius of the tip 123 is provided by manufacturing limitations in casting or forging and quality control to limit chipping of the tip 123 . The tip 123 may be angled rather than curved.

The second protruding portion 12C is a portion that protrudes radially outward from the main body portion 11 from the central portion 12A. In the present embodiment, the projecting direction of the second projecting portion 12C is the direction from the first sensor boss 1 toward the second piping component 4, which is opposite to the projecting direction of the first projecting portion 12B (see FIG. 1B). The second projecting portion 12</b>C is a portion of the first sensor boss 1 that is closest to the second piping component 4 . The second projecting portion 12C is arranged between the central portion 12A and the second piping component 4 .

The second protruding portion 12C has a shape obtained by inverting the first protruding portion 12B (that is, rotating the first protruding portion 12B around the central axis P1 of the main body portion 11 by 180°). Therefore, the radius of curvature at the tip of the second projecting portion 12</b>C as viewed from the axial direction of the body portion 11 is smaller than the radius R<b>1 of the body portion 11 .

The first connecting portion 12D and the second connecting portion 12E connect the first protruding portion 12B and the second protruding portion 12C, respectively, on the radially outer side of the central portion 12A. The first connecting portion 12</b>D and the second connecting portion 12</b>E are arranged so as to sandwich the central portion 12</b>A in the radial direction of the body portion 11 .

The outer edge of the first connecting portion 12D and the outer edge of the second connecting portion 12E are parallel to the outer peripheral surface of the main body portion 11, respectively. Also, the radius of curvature of the first connecting portion 12D and the radius of curvature of the second connecting portion 12E are each larger than the radius of the main body portion 11 .

[1-2. action]
When welding the first sensor boss 1 to the pipe 2, the radius of curvature is reduced by moving the welding torch in the directions of arrows D1 and D2 in FIG. Welding of the tip 123 of the first projecting portion 12B is performed.

Therefore, between the first protruding portion 12B and the first pipe component 3, the welding torch T is placed in the first direction in a direction inclined with respect to the central axis P1 of the main body portion 11 (that is, the radial direction of the pipe 2) shown in FIG. 2D. It is not necessary to abut against the tip 123 of the projecting portion 12B.

Similarly, in the second projecting portion 12C, between the second projecting portion 12C and the second piping component 4, the welding torch is placed at the tip of the second projecting portion 12C in a direction inclined with respect to the central axis P1 of the main body portion 11. The tip of the second projecting portion 12C can be welded without abutting.

[1-3. effect]
According to the embodiment detailed above, the following effects are obtained.
(1a) Since the first protruding portion 12B and the second protruding portion 12C of the flange portion 12 each have a shape with a sharp tip, the posture is inclined with respect to the normal line of the outer peripheral surface of the pipe 2 (that is, the radial direction of the pipe 2). By welding the side surface of the first projecting portion 12B and the side surface of the second projecting portion 12C with a welding torch, the tip of the first projecting portion 12B and the tip of the second projecting portion 12C can be welded.

That is, even if the welding torch is not moved so as to abut against the tip of the first projecting portion 12B and the tip of the second projecting portion 12C, it is possible to weld the entire circumference of the collar portion 12 with a welding torch in an inclined posture with a large amount of penetration. can. Therefore, the first protrusion 12B and the second protrusion 12C are arranged so that the first protrusion 12B and the second protrusion 12C approach other parts (that is, the first piping part 3 and the second piping part 4) that are arranged close to the first sensor boss 1. By arranging the sensor boss 1, it is possible to improve welding quality while avoiding interference between the welding torch and other parts.

(1b) While ensuring the welding quality of the first sensor boss 1, the first sensor boss 1 and the first piping component 3 are arranged close to each other, and the first sensor boss 1 and the second piping component are arranged. 4 can be obtained in close proximity to each other.

(1c) The peripheral edge of the flange portion 12 becomes linear from the tips of the first projecting portion 12B and the second projecting portion 12C toward the main body portion 11 . Therefore, welding of the flange portion 12 is easier than the circular flange portion of the prior art.

[2. Second Embodiment]
[2-1. Constitution]
A sensor boss mounting structure 200 shown in FIGS.

The first sensor boss 1, the pipe 2, and the second pipe component 4 are respectively the same as the first sensor boss 1, the pipe 2, and the second pipe component 4 in the sensor boss mounting structure 100 of FIG. 1A. Therefore, the description is omitted.

<Boss for second sensor>
The second sensor boss 5 is a pipe component arranged on the outer peripheral surface of the pipe 2 . The second sensor boss 5 is a member for attaching a sensor different from the sensor attached to the first sensor boss 1 .

The second sensor boss 5 of this embodiment is the same as the first sensor boss 1 . The second sensor boss 5 is arranged adjacent to the first sensor boss 1 in the axial direction of the pipe 2 . The second sensor boss 5 is arranged on the opposite side of the second piping component 4 with the first sensor boss 1 interposed therebetween.

As shown in FIG. 4B , the second sensor boss 5 includes a body portion 51 and a flange portion 52 . The collar portion 52 has a central portion 52A, a first projecting portion 52B, a second projecting portion 52C, a first connecting portion 52D, and a second connecting portion 52E.

The shape and function of each part of the second sensor boss 5 are the same as the shape and function of each part of the first sensor boss 1 . The central axis P2 of the body portion 51 of the second sensor boss 5 is parallel to the central axis P1 of the body portion 11 of the first sensor boss 1 .

When viewed from the axial direction of the body portion 11 of the first sensor boss 1 (that is, viewed from the radial direction of the pipe 2), the tangent line L2 of the outer peripheral edge of the first sensor boss 1 other than the tip of the first projecting portion 12B, L3 intersects an imaginary straight line L1 connecting the central axis P1 of the main body portion 11 of the first sensor boss 1 and the central axis P2 of the main body portion 51 of the second sensor boss 5 . The tangent lines L2 and L3 may be parallel to the imaginary straight line L1.

[2-2. effect]
According to the embodiment detailed above, the following effects are obtained.
(2a) The welding quality of the first sensor boss 1 can be improved while avoiding interference between the welding torch and the second sensor boss 5 when welding the first projecting portion 12B of the first sensor boss 1 . In addition, the welding quality of the second sensor boss 5 can be improved while avoiding interference between the welding torch and the first sensor boss 1 when welding the second projecting portion 52</b>C of the second sensor boss 5 .

(2b) The first sensor boss 1 and the second sensor boss 5 allow a plurality of sensors to be arranged close to the exhaust gas flow path.

[3. Other embodiments]
Although the embodiments of the present disclosure have been described above, it is needless to say that the present disclosure is not limited to the above embodiments and can take various forms.

(3a) In the sensor boss of the above-described embodiment, the shape of the collar portion is an example. For example, as shown in Figures 5A and 5B, the collar 12 may have one protrusion 12F. Further, as shown in FIG. 5A , the outer edge of the projecting portion 12F may be partially recessed radially inward of the main body portion 11 . Furthermore, as shown in FIG. 5B, the outer edge of the protrusion 12F may be partially straight. Moreover, as shown in FIGS. 5C and 5D, the collar portion 12 may have three or more protrusions 12F, 12G, and 12H.

(3b) In the sensor boss mounting structure of the above embodiment, the second sensor boss does not necessarily have to be the same as the first sensor boss. The second sensor boss may have a different shape than the first sensor boss. Also, the second sensor boss does not necessarily have a projecting portion whose tip has a smaller radius of curvature than the radius of the main body.

(3c) The function of one component in the above embodiments may be distributed as multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiment may be omitted. Also, at least a part of the configuration of the above embodiment may be added, replaced, etc. with respect to the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording in the claims are embodiments of the present disclosure.

DESCRIPTION OF SYMBOLS 1... 1st sensor boss, 2... Piping, 3... 1st piping part, 4... 2nd piping part,
5... second sensor boss, 11... body portion, 12... flange portion, 12A... central portion,
12B... first projecting portion, 12C... second projecting portion, 12D... first connecting portion,
12E... second connecting portion, 12F, 12G, 12H... projecting portion, 51... body portion, 52... flange portion,
52A... Central part, 52B... First projecting part, 52C... Second projecting part, 52D... First connecting part,
52E... Second connecting portion 100... Mounting structure of sensor boss 121... First region,
122... Second region 123... Tip 200... Mounting structure of sensor boss.

Claims (7)

A sensor boss for attaching a sensor to an exhaust gas flow path of an internal combustion engine,
a cylindrical body configured to secure the sensor;
a collar connected to one end of the main body;
with
The collar portion
a central portion located inside the outer peripheral surface of the main body when viewed in a direction parallel to the central axis of the main body;
two protruding portions protruding radially outward from the main body portion from the central portion;
a connecting portion that connects the two protruding portions on the radially outer side of the central portion;
has
a radius of curvature at the tips of the two projections viewed from a direction parallel to the central axis of the main body is smaller than the radius of the main body,
The sensor boss , wherein an outer edge of the connecting portion is parallel to an outer peripheral surface of the main body portion . The sensor boss according to claim 1,
The central portion is
a first region that overlaps the main body portion in a direction parallel to the central axis of the main body portion;
a second region located inside the inner peripheral surface of the main body;
has
In the second region of the sensor boss, the thickness of the central portion decreases toward the radially inner side of the body portion. a pipe through which the exhaust gas of the internal combustion engine flows;
a sensor boss according to claim 1 or claim 2 as a first sensor boss disposed on the outer peripheral surface of the pipe;
a piping component arranged on the outer peripheral surface or end of the piping;
with
The mounting structure of the sensor boss, wherein the flange portion is welded to the outer peripheral surface of the pipe in a direction in which the projecting portion is disposed between the central portion and the pipe component. a pipe through which the exhaust gas of the internal combustion engine flows;
a first sensor boss arranged on the outer peripheral surface of the pipe;
a piping component arranged on the outer peripheral surface or end of the piping;
with
The first sensor boss,
a cylindrical body configured to secure the sensor;
a collar connected to one end of the main body;
with
The collar portion
a central portion located inside the outer peripheral surface of the main body when viewed in a direction parallel to the central axis of the main body;
a protruding portion that protrudes radially outward from the main body portion from the central portion;
has
a radius of curvature at the tip of the protrusion viewed from a direction parallel to the central axis of the main body is smaller than the radius of the main body;
The flange portion is welded to the outer peripheral surface of the pipe in a direction in which the projecting portion is arranged between the central portion and the pipe component,
The mounting structure of the sensor boss, wherein the tip of the projecting portion is closer to the piping component than other parts of the first sensor boss. The mounting structure for the sensor boss according to claim 3 or 4 ,
A mounting structure for a sensor boss, comprising, as the pipe component, a second sensor boss for mounting a sensor different from the sensor to the pipe. The mounting structure for the sensor boss according to claim 5 ,
the second sensor boss includes a tubular body configured to fix the another sensor;
a central axis of the main body portion of the second sensor boss is parallel to a central axis of the main body portion of the first sensor boss;
When viewed from the axial direction of the main body portion of the first sensor boss, a tangent to the outer peripheral edge of the projecting portion of the first sensor boss other than the tip is the center of the main body portion of the first sensor boss. A mounting structure for a sensor boss that is parallel to or intersects an imaginary straight line that connects the axis and the central axis of the main body of the second sensor boss. The mounting structure for the sensor boss according to claim 5 or 6,
the second sensor boss includes a tubular body configured to fix the another sensor;
When viewed from the axial direction of the main body portion of the first sensor boss, the protruding portion of the first sensor boss is located between the main body portion of the first sensor boss and the main body portion of the second sensor boss. Mounting structure of the sensor boss located between

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