JP2018081053A - Sensor mounting structure - Google Patents

Sensor mounting structure Download PDF

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JP2018081053A
JP2018081053A JP2016225247A JP2016225247A JP2018081053A JP 2018081053 A JP2018081053 A JP 2018081053A JP 2016225247 A JP2016225247 A JP 2016225247A JP 2016225247 A JP2016225247 A JP 2016225247A JP 2018081053 A JP2018081053 A JP 2018081053A
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sensor
pipe
mounting structure
sensor mounting
end side
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JP6888279B2 (en
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勝弘 佐藤
Katsuhiro Sato
勝弘 佐藤
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a sensor mounting structure which effectively prevents a sensor from contacting with a vehicle body part and other components by reducing the height of protrusion of the sensor from an outer periphery of a pipe.SOLUTION: A mounting structure 20 of a sensor 30 provided at an intake/exhaust system of an engine 1 includes: a boss part 21 provided in a manner to protrude from an outer peripheral surface of a pipe 13; a seating surface 22 which is formed by obliquely cutting off a protruding end of the boss part 21, and which seats a nut part 33 of the sensor 30; and a through hole 23 which penetrates the boss part 21 from the seating surface 22 along an inner peripheral surface of the pipe 13, and which allows a sensor part 31 to be inserted.SELECTED DRAWING: Figure 1

Description

本発明は、センサの取付構造に関し、特に、エンジンの吸排気系に設けられるセンサの取付構造に関する。   The present invention relates to a sensor mounting structure, and more particularly to a sensor mounting structure provided in an intake / exhaust system of an engine.

一般的に、エンジンの吸気管、排気管、ＥＧＲ配管（以下、単に配管ともいう）には、吸気や排気、ＥＧＲガスの状態量を取得する各種センサ類が設けられている。各種センサ類としては、温度センサ、ＮＯｘセンサ、酸素濃度センサ、ブースト圧センサ等がある。   In general, an intake pipe, an exhaust pipe, and an EGR pipe (hereinafter also simply referred to as a pipe) of an engine are provided with various sensors that acquire state quantities of intake air, exhaust gas, and EGR gas. Various sensors include a temperature sensor, a NOx sensor, an oxygen concentration sensor, a boost pressure sensor, and the like.

この種のセンサ類は、先端側のセンサ部を配管内に挿入させると共に、基端側のハーネス保持部を配管外に突出させて、センサ軸心が鉛直方向となるように取り付けられるのが一般的である（例えば、特許文献１〜３参照）。   This type of sensor is generally mounted so that the sensor part on the front end side is inserted into the pipe and the harness holding part on the base end side protrudes outside the pipe so that the sensor axis is in the vertical direction. (For example, see Patent Documents 1 to 3).

特開２００２−１２２４８６号公報JP 2002-122486 A 特開２０１３−０２９４８２号公報JP 2013-029482 A 特開２００７−０２３８５０号公報JP 2007-023850 A

ところで、上記従来技術のように、センサを配管に鉛直方向に取り付けると、特に配管の外側に位置するハーネス保持部が配管外周から上方に大きく突出された状態となる。このため、例えば、エンジンとキャブ下面とのクリアランスが狭いキャブオーバ型車両において、エンジンの上部側に隣接配置されるＥＧＲ配管に、センサを鉛直方向に取り付けると、車両の振動等の影響によりクリアランスが変動した際に、ハーネス保持部がキャブ下面に接触して干渉する課題がある。   By the way, when the sensor is attached to the pipe in the vertical direction as in the prior art described above, the harness holding portion positioned particularly outside the pipe is greatly protruded upward from the outer circumference of the pipe. For this reason, for example, in a cab-over type vehicle where the clearance between the engine and the cab lower surface is narrow, if the sensor is mounted in the vertical direction on the EGR pipe disposed adjacent to the upper side of the engine, the clearance fluctuates due to the influence of vehicle vibration and the like. When this occurs, there is a problem that the harness holding portion contacts the cab lower surface and interferes therewith.

本開示の技術は、センサの配管外周からの突出高さを低減させることで、センサが車体部位や他の部品類に接触することを効果的に防止することを目的とする。   An object of the technology of the present disclosure is to effectively prevent the sensor from coming into contact with a vehicle body part or other parts by reducing the protruding height of the sensor from the outer periphery of the pipe.

本開示の技術は、エンジンの吸排気系に設けられるセンサの取付構造であって、前記吸排気系の配管外周面に突出して設けられたボス部と、前記ボス部の突出端側を斜めに切り欠いて形成されて、前記センサの一部を着座させる座面と、前記ボス部を前記座面から前記配管の内周面に亘って貫通形成されて、前記センサの先端側を挿通させる貫通穴と、を備えることを特徴とする。   The technology of the present disclosure is a sensor mounting structure provided in an intake / exhaust system of an engine, wherein a boss portion provided to protrude from a pipe outer peripheral surface of the intake / exhaust system and a protruding end side of the boss portion are inclined. A seating surface formed by cutting out and seating a part of the sensor, and a penetration through which the boss portion is penetrated from the seating surface to the inner peripheral surface of the pipe, and the tip side of the sensor is inserted. And a hole.

また、前記センサは、少なくとも、前記配管の内部に挿入される先端側のセンサ部と、該センサ部よりも基端側に設けられた雄ネジ部と、該雄ネジ部よりも基端側に設けられた拡径部と、該拡径部よりも基端側に設けられてハーネスの一端を保持するハーネス保持部とを含み、前記貫通穴に前記雄ネジ部と螺合する雌ネジ部が設けられると共に、前記座面に前記雄ネジ部と前記拡径部との間に形成された段差面が着座されるものでもよい。   Further, the sensor includes at least a sensor part on a distal end side inserted into the pipe, a male screw part provided on a base end side of the sensor part, and a base end side of the male screw part. A female screw portion that includes a diameter-enlarged portion that is provided and a harness holding portion that is provided on the proximal side of the enlarged-diameter portion and holds one end of the harness, and that is screwed into the male screw portion in the through hole. In addition to being provided, a step surface formed between the male screw portion and the enlarged diameter portion may be seated on the seat surface.

また、前記配管が少なくとも一部に屈曲部を含み、前記ボス部が前記屈曲部の管屈曲外側と管屈曲内側との間の外周面に突出して設けられ、前記座面が前記ボス部の突出端を管屈曲外側から管屈曲内側に向かって斜めに切り欠いて形成され、前記センサ部の先端側が前記屈曲部内の屈曲外側に位置されるものでもよい。   The pipe includes a bent portion at least in part, the boss portion is provided to protrude on an outer peripheral surface between a tube bent outer side and a tube bent inner side of the bent portion, and the seat surface protrudes from the boss portion. The end may be formed by obliquely notching from the outer side of the tube bending toward the inner side of the tube bending, and the tip side of the sensor portion may be positioned on the outer side of the bending portion.

また、前記配管が前記エンジンの排気系から吸気系に再循環される排気ガスを流通させる再循環排気配管であり、前記ボス部が前記再循環排気配管の上部外周面から上方に突出して設けられ、前記座面が水平方向に対して傾斜して形成されてもよい。   Further, the pipe is a recirculation exhaust pipe through which exhaust gas recirculated from the engine exhaust system to the intake system is circulated, and the boss portion is provided so as to protrude upward from an upper outer peripheral surface of the recirculation exhaust pipe. The seating surface may be formed inclined with respect to the horizontal direction.

また、前記貫通穴の穴軸方向が前記座面の面方向と直交することが好ましい。   Moreover, it is preferable that the hole axial direction of the said through-hole is orthogonal to the surface direction of the said seat surface.

本開示の技術によれば、センサの配管外周からの突出高さを低減させることで、センサが車体部位や他の部品類に接触することを効果的に防止することができる。   According to the technique of the present disclosure, it is possible to effectively prevent the sensor from coming into contact with the vehicle body part or other parts by reducing the height of the sensor protruding from the outer periphery of the pipe.

本発明の一実施形態に係るセンサの取付構造が適用されたエンジンの吸排気系を示す模式的な全体構成図である。1 is a schematic overall configuration diagram showing an intake / exhaust system of an engine to which a sensor mounting structure according to an embodiment of the present invention is applied. 本発明の一実施形態に係るセンサの取付構造を示す模式的な斜視図である。It is a typical perspective view which shows the attachment structure of the sensor which concerns on one Embodiment of this invention. 本発明の一実施形態に係るセンサの取付構造を示す模式的な部分断面図である。It is a typical fragmentary sectional view showing the attachment structure of the sensor concerning one embodiment of the present invention. 本発明の一実施形態に係るセンサの取付構造において、ハーネス保持部の突出高さを一般的な取付構造と比較する模式図である。In the sensor mounting structure according to one embodiment of the present invention, it is a schematic diagram comparing the protruding height of the harness holding portion with a general mounting structure.

以下、添付図面に基づいて、本発明の一実施形態に係るセンサの取付構造を説明する。同一の部品には同一の符号を付してあり、それらの名称および機能も同じである。したがって、それらについての詳細な説明は繰返さない。   A sensor mounting structure according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

図１は、本実施形態に係るセンサの取付構造２０が適用されたエンジン１の吸排気系を示す全体構成図である。エンジン１の吸気マニホールド２には、吸気管３が接続されている。また、エンジン１の排気マニホールド４には、排気管５が接続されている。   FIG. 1 is an overall configuration diagram showing an intake / exhaust system of an engine 1 to which a sensor mounting structure 20 according to the present embodiment is applied. An intake pipe 3 is connected to the intake manifold 2 of the engine 1. An exhaust pipe 5 is connected to the exhaust manifold 4 of the engine 1.

排気再循環装置（ＥＧＲ装置）１０は、少なくとも、上流側ＥＧＲ配管１１と、ＥＧＲクーラ１２と、エルボ配管１３と、下流側ＥＧＲ配管１４とを備えている。   The exhaust gas recirculation device (EGR device) 10 includes at least an upstream EGR pipe 11, an EGR cooler 12, an elbow pipe 13, and a downstream EGR pipe 14.

上流側ＥＧＲ配管１１は、排気マニホールド４から分岐すると共に、その下流端をＥＧＲクーラ１２の入口部に接続されている。ＥＧＲクーラ１２には、図示しないエンジン冷却水回路から冷却水が取り込まれており、ＥＧＲガスを冷却水との熱交換により冷却する。エルボ配管１３は、水平方向に略Ｌ字状に屈曲する配管であって、その入口部をＥＧＲクーラ１２の出口部に接続されている。下流側ＥＧＲ配管１４は、その上流端をエルボ配管１３の出口部に接続されると共に、その下流端を吸気マニホールド２に合流させている。また、下流側ＥＧＲ配管１４には、図示しないＥＧＲバルブが設けられている。本実施形態において、取付構造２０はエルボ配管１３に設けられている。以下、取付構造２０の詳細について説明する。   The upstream EGR pipe 11 branches from the exhaust manifold 4, and its downstream end is connected to the inlet portion of the EGR cooler 12. Cooling water is taken into the EGR cooler 12 from an engine cooling water circuit (not shown), and the EGR gas is cooled by heat exchange with the cooling water. The elbow pipe 13 is a pipe that is bent in a substantially L shape in the horizontal direction, and its inlet is connected to the outlet of the EGR cooler 12. The downstream EGR pipe 14 has an upstream end connected to the outlet of the elbow pipe 13 and a downstream end joined to the intake manifold 2. The downstream EGR pipe 14 is provided with an EGR valve (not shown). In the present embodiment, the mounting structure 20 is provided on the elbow pipe 13. Hereinafter, details of the mounting structure 20 will be described.

図２に示すように、エルボ配管１３は、略Ｌ字状に屈曲する中空状の本体部１３Ａと、ＥＧＲクーラ１２（図１参照）に図示しないボルトナットで固定される入口フランジ部１３Ｂと、下流側ＥＧＲ配管１４（図１参照）に図示しないボルトナットで固定される出口フランジ部１３Ｃとを備えている。   As shown in FIG. 2, the elbow pipe 13 includes a hollow main body portion 13 </ b> A that is bent in a substantially L shape, an inlet flange portion 13 </ b> B that is fixed to the EGR cooler 12 (see FIG. 1) with a bolt and nut (not shown), A downstream EGR pipe 14 (see FIG. 1) is provided with an outlet flange portion 13C fixed with a bolt and nut (not shown).

取付構造２０は、エルボ配管１３の本体部１３Ａの外周上面に溶接等により固設された略円柱状のボス部２１と、ボス部２１の上端側を斜めに切り欠いて形成した座面２２と、ボス部２１に貫通形成された雌ネジ穴２３とを有する。   The attachment structure 20 includes a substantially cylindrical boss portion 21 fixed to the upper surface of the outer periphery of the main body portion 13A of the elbow pipe 13 by welding or the like, and a seat surface 22 formed by obliquely notching the upper end side of the boss portion 21. And a female screw hole 23 formed through the boss portion 21.

座面２２は、その平面が水平方向に対して傾斜するように、ボス部２１の上端側を管屈曲外側から出口フランジ部１３Ｃ側（又は、管屈曲内側）に向って斜めに切り欠いて形成されている。すなわち、座面２２は、その管屈曲外側の縁端部２２Ａが出口フランジ部１３Ｃ側の縁端部２２Ｂよりも上方に位置するように傾斜して形成されている。   The seating surface 22 is formed by notching the upper end side of the boss portion 21 obliquely from the outer side of the tube bending toward the outlet flange portion 13C (or the inner side of the tube bending) so that the plane is inclined with respect to the horizontal direction. Has been. That is, the seat surface 22 is formed so as to be inclined so that the edge end portion 22A on the outer side of the tube bend is positioned above the edge end portion 22B on the outlet flange portion 13C side.

雌ネジ穴２３は、その穴軸方向が座面２２の面方向と直交するように、座面２２の略中央部から本体部１３Ａの管内周に亘ってボス部２１を貫通形成されている。   The female screw hole 23 is formed to penetrate the boss portion 21 from the substantially central portion of the seat surface 22 to the inner periphery of the main body portion 13A so that the hole axial direction is orthogonal to the surface direction of the seat surface 22.

図３に示すように、センサ３０は、例えば、ＥＧＲガスの温度を検出する温度センサであって、先端（下端）側から順に、エルボ配管１３内に挿入される有底筒状のセンサ部３１と、センサ部３１よりも拡径された雄ネジ部３２と、雄ネジ部３２よりも拡径されたナット部３３と、その内部にハーネス３５の一端を保持する円筒状のハーネス保持部３４とを備えている。   As shown in FIG. 3, the sensor 30 is, for example, a temperature sensor that detects the temperature of EGR gas, and is a bottomed cylindrical sensor unit 31 that is inserted into the elbow pipe 13 in order from the tip (lower end) side. A male screw part 32 having a diameter larger than that of the sensor part 31, a nut part 33 having a diameter larger than that of the male screw part 32, and a cylindrical harness holding part 34 for holding one end of the harness 35 therein. It has.

センサ３０は、センサ部３１を雌ネジ穴２３に挿通させると共に、ナット部３３を図示しない工具で回転させて雄ネジ部３２を雌ネジ穴２３に螺合させ、ナット部３３の下面を座面２２に着座させることで、エルボ配管１３に取り付けられるようになっている。   The sensor 30 inserts the sensor portion 31 into the female screw hole 23 and rotates the nut portion 33 with a tool (not shown) to screw the male screw portion 32 into the female screw hole 23 so that the lower surface of the nut portion 33 is seated on the seat surface. By being seated on 22, it can be attached to the elbow pipe 13.

本実施形態において、座面２２は水平方向に対して斜めに傾斜して形成されているので、センサ３０をエルボ配管１３に取り付けると、本体部１３内に挿入されたセンサ部３１の先端部は管軸心よりも屈曲外側に偏心され、さらに、ボス部２１から突出するハーネス保持部３４は鉛直方向に対して傾けられた状態になる。   In the present embodiment, since the seat surface 22 is formed obliquely with respect to the horizontal direction, when the sensor 30 is attached to the elbow pipe 13, the tip of the sensor unit 31 inserted into the main body unit 13 is The harness holding portion 34 that is eccentric to the bent outer side than the tube axis and further protrudes from the boss portion 21 is inclined with respect to the vertical direction.

すなわち、図４中に破線で示す座面を水平方向に形成した一般的な取付構造に比べ、ハーネス保持部３４の突出高さが低く抑えられるようになっている。なお、座面２２の傾斜角度は、例えば、センサ部３１の先端が管内壁に接触しない角度、或は、センサ部３１の管軸心からの偏心量がセンサ３０の検出値に影響を与えない範囲の角度等、センサ部３１の全長に応じて適宜最適な値に設定すればよい。   That is, the protrusion height of the harness holding portion 34 can be suppressed to be lower than that of a general mounting structure in which a seating surface indicated by a broken line in FIG. 4 is formed in the horizontal direction. The inclination angle of the seating surface 22 is, for example, an angle at which the tip of the sensor unit 31 does not contact the inner wall of the tube, or the amount of eccentricity from the tube axis of the sensor unit 31 does not affect the detection value of the sensor 30. What is necessary is just to set to the optimal value suitably according to the full length of the sensor part 31, such as the angle of a range.

以上詳述したように、本実施形態の取付構造２０によれば、センサ３０のナット部３３下面が着座する座面２２を水平方向に対して傾斜させたことで、センサ３０をエルボ配管１３に取り付けると、ボス部２１から突出するハーネス保持部３４が鉛直方向に対して傾けられるようになる。これにより、ハーネス保持部３４の管外周からの突出高さを効果的に低減させることが可能となり、ハーネス保持部３４がＥＧＲ装置１０の直上に位置するキャブ下面（不図示）、或は、他の車両部位や部品類に接触することを効果的に防止することができる。   As described in detail above, according to the mounting structure 20 of the present embodiment, the sensor 30 is attached to the elbow pipe 13 by inclining the seating surface 22 on which the lower surface of the nut portion 33 of the sensor 30 is seated with respect to the horizontal direction. When attached, the harness holding portion 34 protruding from the boss portion 21 is inclined with respect to the vertical direction. This makes it possible to effectively reduce the protruding height of the harness holding part 34 from the outer periphery of the pipe, and the harness holding part 34 is located on the lower surface of the cab (not shown) directly above the EGR device 10 or other It is possible to effectively prevent the vehicle parts and parts from coming into contact with each other.

また、座面２２を管屈曲外側の縁端部２２Ａが出口フランジ部１３Ｃ側（又は、管屈曲内側）の縁端部２２Ｂよりも上方に位置するように傾斜させたことで、センサ３０のセンサ部３１の先端側をＥＧＲガスの流れが偏流される配管内の屈曲外側に配置させることができる。   Further, the seat surface 22 is inclined so that the edge portion 22A on the outer side of the tube bend is positioned above the edge portion 22B on the outlet flange portion 13C side (or on the inner side of the tube bend). The tip end side of the portion 31 can be disposed outside the bent in the pipe where the flow of EGR gas is drifted.

なお、本発明は、上述の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、適宜変形して実施することが可能である。   In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

例えば、取付構造２０が設けられる配管は、ＥＧＲ装置１０のエルボ管１３に限定されず、吸気管３や排気管５等の他の配管であってもよい。   For example, the pipe provided with the mounting structure 20 is not limited to the elbow pipe 13 of the EGR device 10, and may be other pipes such as the intake pipe 3 and the exhaust pipe 5.

また、取付構造２０が設けられる配管形状はエルボ配管１３等の屈曲配管に限定されず、直線状のストレート配管であってもよい。   Further, the pipe shape in which the mounting structure 20 is provided is not limited to the bent pipe such as the elbow pipe 13 and may be a straight straight pipe.

また、取り付け対象となるセンサ３０は、温度センサに限定されず、ＮＯｘセンサ、酸素濃度センサ、ブースト圧センサ等の他のセンサ類であてもよい。   The sensor 30 to be attached is not limited to a temperature sensor, and may be other sensors such as a NOx sensor, an oxygen concentration sensor, a boost pressure sensor, and the like.

１ エンジン
２ 吸気マニホールド
３ 吸気管
４ 排気マニホールド
５ 排気管
１０ ＥＧＲ装置
１１ 上流側ＥＧＲ配管
１２ ＥＧＲクーラ
１３ エルボ配管
１４ 下流側ＥＧＲ配管
２０ 取付構造
２１ ボス部
２２ 座面
２３ 雌ネジ穴
３０ センサ
３１ センサ部
３２ 雄ネジ部
３３ ナット部
３４ ハーネス保持部
３５ ハーネス DESCRIPTION OF SYMBOLS 1 Engine 2 Intake manifold 3 Intake pipe 4 Exhaust manifold 5 Exhaust pipe 10 EGR apparatus 11 Upstream EGR piping 12 EGR cooler 13 Elbow piping 14 Downstream EGR piping 20 Mounting structure 21 Boss part 22 Seat surface 23 Female screw hole 30 Sensor 31 Sensor Part 32 Male thread part 33 Nut part 34 Harness holding part 35 Harness

Claims (5)

エンジンの吸排気系に設けられるセンサの取付構造であって、
前記吸排気系の配管外周面に突出して設けられたボス部と、
前記ボス部の突出端側を斜めに切り欠いて形成されて、前記センサの一部を着座させる座面と、
前記ボス部を前記座面から前記配管の内周面に亘って貫通形成されて、前記センサの先端側を挿通させる貫通穴と、を備える
ことを特徴とするセンサの取付構造。 A sensor mounting structure provided in an intake / exhaust system of an engine,
A boss part protruding from the outer peripheral surface of the pipe of the intake and exhaust system;
A projecting end side of the boss part is formed by cutting obliquely, and a seating surface for seating a part of the sensor;
A sensor mounting structure, comprising: a through hole formed through the boss portion from the seat surface to the inner peripheral surface of the pipe and through which the tip side of the sensor is inserted. 前記センサは、少なくとも、前記配管の内部に挿入される先端側のセンサ部と、該センサ部よりも基端側に設けられた雄ネジ部と、該雄ネジ部よりも基端側に設けられた拡径部と、該拡径部よりも基端側に設けられてハーネスの一端を保持するハーネス保持部とを含み、
前記貫通穴に前記雄ネジ部と螺合する雌ネジ部が設けられると共に、前記座面に前記雄ネジ部と前記拡径部との間に形成された段差面が着座される
請求項１に記載のセンサの取付構造。 The sensor is provided at least at a distal end side sensor portion to be inserted into the pipe, a male screw portion provided at a base end side with respect to the sensor portion, and a base end side with respect to the male screw portion. An enlarged diameter part, and a harness holding part that is provided on the proximal end side of the enlarged diameter part and holds one end of the harness,
The female screw portion that is screwed with the male screw portion is provided in the through hole, and a stepped surface formed between the male screw portion and the enlarged diameter portion is seated on the seat surface. The sensor mounting structure described. 前記配管が少なくとも一部に屈曲部を含み、前記ボス部が前記屈曲部の管屈曲外側と管屈曲内側との間の外周面に突出して設けられ、前記座面が前記ボス部の突出端を管屈曲外側から管屈曲内側に向かって斜めに切り欠いて形成され、前記センサ部の先端側が前記屈曲部内の屈曲外側に位置される
請求項１又は２に記載のセンサの取付構造。 The pipe includes a bent portion at least in part, the boss portion is provided to protrude on an outer peripheral surface between a tube bent outer side and a tube bent inner side of the bent portion, and the seat surface has a protruding end of the boss portion. The sensor mounting structure according to claim 1, wherein the sensor mounting structure is formed by obliquely cutting away from a tube bending outer side toward a tube bending inner side, and a distal end side of the sensor unit is positioned on a bending outer side in the bending portion. 前記配管が前記エンジンの排気系から吸気系に再循環される排気ガスを流通させる再循環排気配管であり、前記ボス部が前記再循環排気配管の上部外周面から上方に突出して設けられ、前記座面が水平方向に対して傾斜して形成された
請求項１から３の何れか一項に記載のセンサの取付構造。 The pipe is a recirculation exhaust pipe for circulating exhaust gas recirculated from the engine exhaust system to the intake system, and the boss portion is provided to protrude upward from the upper outer peripheral surface of the recirculation exhaust pipe, The sensor mounting structure according to any one of claims 1 to 3, wherein the seating surface is formed to be inclined with respect to the horizontal direction. 前記貫通穴の穴軸方向が前記座面の面方向と直交する
請求項１から４の何れか一項に記載のセンサの取付構造。 The sensor mounting structure according to any one of claims 1 to 4, wherein a hole axial direction of the through hole is orthogonal to a surface direction of the seating surface.
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