JP6300354B2

JP6300354B2 - Pressure detection device

Info

Publication number: JP6300354B2
Application number: JP2014098471A
Authority: JP
Inventors: 篤史本田; 晃示大矢
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2014-05-12
Filing date: 2014-05-12
Publication date: 2018-03-28
Anticipated expiration: 2034-05-12
Also published as: JP2015215247A

Description

本発明は、燃焼室の燃焼圧を検出する圧力検出装置に関する。 The present invention relates to a pressure detection device that detects a combustion pressure in a combustion chamber.

従来より、燃焼室の燃焼圧を検出する燃焼圧センサが、特許文献１で提案されている。具体的には、燃焼圧センサは、筒状の本体の前端部に設けられたダイヤフラムと、ダイヤフラムと一体的に形成された電極部と、電極部に当接した荷重検出素子と、荷重検出素子のうち電極部とは反対側に当接したリード電極と、を備えている。 Conventionally, a combustion pressure sensor for detecting the combustion pressure in the combustion chamber has been proposed in Patent Document 1. Specifically, the combustion pressure sensor includes a diaphragm provided at a front end portion of a cylindrical main body, an electrode portion integrally formed with the diaphragm, a load detection element in contact with the electrode portion, and a load detection element And a lead electrode in contact with the opposite side of the electrode portion.

また、燃焼圧センサは、リード電極のうち荷重検出素子とは反対側に絶縁部を介して設けられたインナーボディ及び予圧ねじを備えている。予圧ネジは、本体の内周面に設けられたネジ部にネジ止めされることで、インナーボディに対して予圧を作用させている。 Further, the combustion pressure sensor includes an inner body and a preload screw provided on an opposite side of the lead electrode to the load detection element via an insulating portion. The preload screw is screwed to a screw portion provided on the inner peripheral surface of the main body, thereby applying a preload to the inner body.

上記の構成により、ダイヤフラムと予圧ネジとの間に位置する電極部、荷重検出素子、リード電極、絶縁部、及びインナーボディに予め予荷重が掛かる。これにより、ダイヤフラムに印加される衝撃によってダイヤフラムと予圧ネジとの間の部品が跳ね上がって破壊されないようになっている。 With the above configuration, a preload is applied in advance to the electrode portion, the load detection element, the lead electrode, the insulating portion, and the inner body located between the diaphragm and the preload screw. As a result, an impact applied to the diaphragm prevents the parts between the diaphragm and the preload screw from jumping up and being destroyed.

特開２００８−１９１０５９号公報JP 2008-191059 A

しかしながら、上記従来の技術では、ダイヤフラムは受圧だけでなく予荷重のための支持の機能も担っているので、ダイヤフラムが予荷重に耐えられるようにダイヤフラムを高強度及び高バネ定数とする必要がある。ここで、ダイヤフラムを高感度にするためにはダイヤフラムのバネ定数を小さくする必要がある。このため、圧力検出装置において荷重検出素子に印加する予荷重を保持するための高強度な構成とダイヤフラムの高感度とを両立することができないという問題があった。 However, in the above-described conventional technology, the diaphragm has not only pressure reception but also a support function for preloading. Therefore, the diaphragm needs to have high strength and high spring constant so that the diaphragm can withstand the preloading. . Here, in order to make the diaphragm highly sensitive, it is necessary to reduce the spring constant of the diaphragm. For this reason, there existed a problem that the high intensity | strength structure for hold | maintaining the preload applied to a load detection element in a pressure detection apparatus and the high sensitivity of a diaphragm were not able to be made compatible.

また、燃焼室で異常燃焼が発生した場合、想定外の衝撃波がダイヤフラムに作用する。そして、ダイヤフラムが破れてしまう場合がある。これにより、荷重検出素子や電極部等が燃焼室に脱落するという可能性があった。 In addition, when abnormal combustion occurs in the combustion chamber, an unexpected shock wave acts on the diaphragm. And a diaphragm may be torn. Thereby, there existed a possibility that a load detection element, an electrode part, etc. will fall in a combustion chamber.

本発明は上記点に鑑み、荷重検出素子に予め予荷重を印加した構成を有する圧力検出装置において、荷重検出素子に印加する予荷重を保持するための高強度な構成とダイヤフラムの高感度な構成とを両立し、さらに燃焼室への荷重検出素子の脱落を防止することができる構造を提供することを目的とする。 In view of the above points, the present invention provides a high-strength configuration for maintaining a preload applied to a load detection element and a highly sensitive configuration for a diaphragm in a pressure detection device having a configuration in which a preload is applied to the load detection element in advance. It is another object of the present invention to provide a structure that can prevent both the load detection element from dropping into the combustion chamber.

上記目的を達成するため、請求項１に記載の発明では、燃焼室を構成する燃焼機構に取り付けられると共に、燃焼室の燃焼圧を検出する圧力検出装置であって、以下の点を特徴としている。 In order to achieve the above object, the invention described in claim 1 is a pressure detection device that is attached to a combustion mechanism constituting the combustion chamber and detects the combustion pressure in the combustion chamber, and is characterized by the following points. .

印加される荷重を検出する荷重検出素子（４１）と、荷重検出素子（４１）を挟み込むと共に荷重検出素子（４１）に所定の予荷重を印加することで荷重検出素子（４１）に圧接された予荷重印加部（４２）と、を有する予荷重保持部（４０）を備えている。 The load detecting element (41) for detecting the applied load is sandwiched between the load detecting element (41) and a predetermined preload is applied to the load detecting element (41) to press the load detecting element (41). A preload holding section (40) having a preload application section (42).

また、燃焼室に配置されると共に予荷重印加部（４２）に当接しており、燃焼室の燃焼圧に基づく荷重を予荷重印加部（４２）を介して荷重検出素子（４１）に伝達させるダイヤフラム（６０）を備えている。 Moreover, it arrange | positions in a combustion chamber and is contact | abutted to the preload application part (42), and transmits the load based on the combustion pressure of a combustion chamber to a load detection element (41) via a preload application part (42). A diaphragm (60) is provided.

また、第１中空部（３１）を有する中空筒状であり、第１中空部（３１）に予荷重保持部（４０）を収容し、一方の開口端（３４）にダイヤフラム（６０）が固定された胴体部（３０）を備えている。 Moreover, it is a hollow cylinder shape which has a 1st hollow part (31), a preload holding part (40) is accommodated in a 1st hollow part (31), and a diaphragm (60) is fixed to one open end (34). The body part (30) made is provided.

そして、胴体部（３０）は、一方の開口端（３４）とは反対側の他方の開口端（３６）のうちの内壁面（３７）側が一方の開口端（３４）側に凹んだ段差部（３３）を有している。 The body portion (30) has a stepped portion in which the inner wall surface (37) side of the other opening end (36) opposite to the one opening end (34) is recessed toward the one opening end (34). (33).

さらに、予荷重保持部（４０）は、胴体部（３０）の内壁面（３７）に対向する外壁面（４３ｅ、４８ｃ、５０ｅ）に、当該外壁面（４３ｅ、４８ｃ、５０ｅ）の一部が突出すると共に段差部（３３）に配置されることで段差部（３３）に接触するつば部（４３ｄ、４８ｄ、５０ｆ）を有していることを特徴とする。
そして、予荷重印加部（４２）は、第２中空部（４３ａ）を有する有底筒状であると共に荷重検出素子（４１）の一方の電極として機能し、第２中空部（４３ａ）を構成する内壁面（４３ｂ）から離間するように荷重検出素子（４１）が第２中空部（４３ａ）の底面（４３ｃ）に配置された有底筒部（４３）と、第２中空部（４３ａ）に内壁面（４３ｂ）から離間して配置されると共に、荷重検出素子（４１）のうち底面（４３ｃ）側とは反対側に当接し、さらに荷重検出素子（４１）の他方の電極として機能する電極部（４４）と、第２中空部（４３ａ）に配置されると共に、電極部（４４）のうち荷重検出素子（４１）側とは反対側に当接した絶縁材（４５）と、絶縁材（４５）のうち電極部（４４）とは反対側に当接すると共に、底面（４３ｃ）との間に位置する荷重検出素子（４１）、電極部（４４）、及び絶縁材（４５）に所定の予荷重を印加した状態で有底筒部（４３）の開口部（４３ｆ）に固定された荷重部（４７）と、を有して構成されており、つば部（４３ｄ）は、有底筒部（４３）の外壁面（４３ｅ）に設けられていることを特徴とする。
請求項２に記載の発明では、予荷重印加部（４２）は、第２中空部（４８ａ）を有する中空筒状であり、第２中空部（４８ａ）を構成する内壁面（４８ｂ）から離間するように荷重検出素子（４１）が第２中空部（４８ａ）に配置された筒部（４８）と、荷重検出素子（４１）に当接すると共に荷重検出素子（４１）の一方の電極として機能し、筒部（４８）のうちの一方の開口部（４８ｅ）に固定された台座（４９）と、第２中空部（４８ａ）に内壁面（４８ｂ）から離間して配置されると共に、荷重検出素子（４１）のうち台座（４９）とは反対側に当接し、さらに荷重検出素子（４１）の他方の電極として機能する電極部（４４）と、第２中空部（４８ａ）に配置されると共に、電極部（４４）のうち荷重検出素子（４１）とは反対側に当接した絶縁材（４５）と、絶縁材（４５）のうち電極部（４４）とは反対側に当接すると共に、台座（４９）との間に位置する荷重検出素子（４１）、電極部（４４）、及び絶縁材（４５）に所定の予荷重を印加した状態で筒部（４８）のうちの他方の開口部（４８ｆ）に固定された荷重部（４７）と、を有して構成されており、つば部（４８ｄ）は、筒部（４８）の外壁面（４８ｃ）に設けられていることを特徴とする。
請求項３に記載の発明では、予荷重印加部（４２）は、荷重検出素子（４１）に当接すると共に荷重検出素子（４１）の一方の電極として機能する台座（４９）と、荷重検出素子（４１）のうち台座（４９）とは反対側に当接し、さらに荷重検出素子（４１）の他方の電極として機能する電極部（４４）と、電極部（４４）のうち荷重検出素子（４１）とは反対側に当接した絶縁材（４５）と、第２中空部（５０ａ）を有する有底筒状であり、絶縁材（４５）が第２中空部（５０ａ）の底面（５０ｂ）に当接すると共に荷重検出素子（４１）及び電極部（４４）が第２中空部（５０ａ）を構成する内壁面（５０ｃ）から離間して配置され、さらに、台座（４９）との間に位置する荷重検出素子（４１）、電極部（４４）、及び絶縁材（４５）に所定の予荷重を印加した状態で開口部（５０ｄ）が台座（４９）に固定された荷重部（５０）と、を有して構成されており、つば部（５０ｆ）は、荷重部（５０）の外壁面（５０ｅ）に設けられていることを特徴とする。
請求項４に記載の発明では、予荷重印加部（４２）は、第２中空部（４８ａ）を有する中空筒状であり、第２中空部（４８ａ）を構成する内壁面（４８ｂ）から離間するように荷重検出素子（４１）が第２中空部（４８ａ）に配置された筒部（４８）と、荷重検出素子（４１）に当接すると共に荷重検出素子（４１）の一方の電極として機能し、筒部（４８）のうちの一方の開口部（４８ｅ）に固定された台座（４９）と、第２中空部（４８ａ）に内壁面（４８ｂ）から離間して配置されると共に、荷重検出素子（４１）のうち台座（４９）とは反対側に当接し、さらに荷重検出素子（４１）の他方の電極として機能する電極部（４４）と、電極部（４４）のうち荷重検出素子（４１）とは反対側に当接すると共に、台座（４９）との間に位置する荷重検出素子（４１）及び電極部（４４）に所定の予荷重を印加した状態で筒部（４８）のうちの他方の開口部（４８ｆ）に固定された絶縁材（５１）と、を有して構成されており、つば部（４８ｄ）は、筒部（４８）の外壁面（４８ｃ）に設けられていることを特徴とする。 Further, the preload holding part (40) has a part of the outer wall surface (43e, 48c, 50e) on the outer wall surface (43e, 48c, 50e) facing the inner wall surface (37) of the body part (30). It has a collar part (43d, 48d, 50f) which contacts a step part (33) by projecting and being arranged in a step part (33).
The preload application section (42) has a bottomed cylindrical shape having the second hollow section (43a) and functions as one electrode of the load detection element (41) to constitute the second hollow section (43a). A bottomed tube portion (43) in which the load detection element (41) is disposed on the bottom surface (43c) of the second hollow portion (43a) so as to be separated from the inner wall surface (43b), and the second hollow portion (43a) Are spaced apart from the inner wall surface (43b), abut against the side of the load detection element (41) opposite to the bottom surface (43c) side, and further function as the other electrode of the load detection element (41). An insulating member (45) disposed in the electrode portion (44) and the second hollow portion (43a) and in contact with the opposite side of the electrode portion (44) from the load detecting element (41) side, and insulation The material (45) contacts the opposite side of the electrode part (44) and has a bottom surface. 43c) with a predetermined preload applied to the load detecting element (41), the electrode part (44), and the insulating material (45) positioned between the opening part (43f) of the bottomed cylindrical part (43). And a flange portion (43d) provided on the outer wall surface (43e) of the bottomed cylindrical portion (43). .
In the invention according to claim 2, the preload application part (42) is a hollow cylinder having the second hollow part (48a), and is separated from the inner wall surface (48b) constituting the second hollow part (48a). The load detection element (41) functions as a cylinder part (48) disposed in the second hollow part (48a), the load detection element (41) and one electrode of the load detection element (41). The pedestal (49) fixed to one opening (48e) of the cylindrical portion (48) and the second hollow portion (48a) are arranged apart from the inner wall surface (48b) and are loaded. Of the detection element (41), it is in contact with the opposite side of the pedestal (49), and further disposed in the electrode part (44) functioning as the other electrode of the load detection element (41) and the second hollow part (48a). And on the opposite side of the electrode part (44) from the load detection element (41) The abutting insulating material (45), a load detecting element (41) that is in contact with the opposite side of the insulating material (45) to the electrode portion (44) and located between the pedestal (49) and the electrode portion (44) and a load portion (47) fixed to the other opening (48f) of the cylindrical portion (48) in a state where a predetermined preload is applied to the insulating material (45). It is comprised and the collar part (48d) is provided in the outer wall surface (48c) of a cylinder part (48), It is characterized by the above-mentioned.
In the invention according to claim 3, the preload application section (42) contacts the load detection element (41) and functions as one electrode of the load detection element (41), and the load detection element (41) abuts on the opposite side of the pedestal (49) and further functions as the other electrode of the load detection element (41), and the load detection element (41) of the electrode part (44). ) And a bottomed cylindrical shape having a second hollow portion (50a), and the bottom surface (50b) of the second hollow portion (50a). The load detection element (41) and the electrode part (44) are arranged apart from the inner wall surface (50c) constituting the second hollow part (50a), and are further positioned between the base (49) Load detecting element (41), electrode part (44), and insulating material (45) A load portion (50) in which the opening (50d) is fixed to the pedestal (49) in a state where a predetermined preload is applied, and the collar portion (50f) ) On the outer wall surface (50e).
In the invention according to claim 4, the preload application section (42) has a hollow cylindrical shape having the second hollow section (48a) and is separated from the inner wall surface (48b) constituting the second hollow section (48a). The load detection element (41) functions as a cylinder part (48) disposed in the second hollow part (48a), the load detection element (41) and one electrode of the load detection element (41). The pedestal (49) fixed to one opening (48e) of the cylindrical portion (48) and the second hollow portion (48a) are arranged apart from the inner wall surface (48b) and are loaded. An electrode portion (44) that abuts on the opposite side of the detection element (41) from the pedestal (49) and functions as the other electrode of the load detection element (41), and a load detection element of the electrode portion (44) (41) abuts on the opposite side of the pedestal (49) An insulating material (51) fixed to the other opening (48f) of the cylindrical portion (48) in a state where a predetermined preload is applied to the load detecting element (41) and the electrode portion (44). The collar part (48d) is provided in the outer wall surface (48c) of a cylinder part (48), It is characterized by the above-mentioned.

これによると、荷重検出素子（４１）に予荷重を印加する予荷重保持部（４０）と、圧力を受圧するダイヤフラム（６０）と、が分離されているので、ダイヤフラム（６０）に荷重検出素子（４１）に予荷重を与えるための性能を持たせる必要がない。すなわち、ダイヤフラム（６０）を高強度にするためにダイヤフラム（６０）のバネ定数を大きくする必要がない。このため、荷重検出素子（４１）に印加する予荷重を保持するために予荷重印加部（４２）を高強度な構成とすることができる。一方、ダイヤフラム（６０）のバネ定数を小さくすることができるので、ダイヤフラム（６０）を高感度に構成することができる。したがって、荷重検出素子（４１）に印加する予荷重を保持するための高強度な構成とダイヤフラム（６０）の高感度な構成とを両立することができる。 According to this, since the preload holding part (40) for applying a preload to the load detection element (41) and the diaphragm (60) for receiving pressure are separated, the load detection element is connected to the diaphragm (60). It is not necessary to give the performance for giving a preload to (41). That is, it is not necessary to increase the spring constant of the diaphragm (60) in order to make the diaphragm (60) high in strength. For this reason, in order to hold | maintain the preload applied to a load detection element (41), a preload application part (42) can be made into a high intensity | strength structure. On the other hand, since the spring constant of the diaphragm (60) can be reduced, the diaphragm (60) can be configured with high sensitivity. Therefore, it is possible to achieve both a high-strength configuration for holding the preload applied to the load detection element (41) and a high-sensitivity configuration of the diaphragm (60).

また、予荷重保持部（４０）に設けられたつば部（４３ｄ、４８ｄ、５０ｆ）が胴体部（３０）の段差部（３３）に引っ掛かるので、ダイヤフラム（６０）が破れたとしても予荷重保持部（４０）が燃焼室に脱落することを防止することができる。 Further, since the flange portions (43d, 48d, 50f) provided in the preload holding portion (40) are caught by the step portion (33) of the body portion (30), even if the diaphragm (60) is torn, the preload holding is performed. It can prevent that a part (40) falls out to a combustion chamber.

なお、この欄及び特許請求の範囲で記載した各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。 In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

本発明の第１実施形態に係る圧力検出装置の一部断面図である。1 is a partial cross-sectional view of a pressure detection device according to a first embodiment of the present invention. 圧力検出装置の製造工程のうちのエージング工程を示した図である。It is the figure which showed the aging process among the manufacturing processes of a pressure detection apparatus. 本発明の第２実施形態に係る圧力検出装置の一部断面図である。It is a partial cross section figure of the pressure sensing device concerning a 2nd embodiment of the present invention. 本発明の第３実施形態に係る圧力検出装置の一部断面図である。It is a partial cross section figure of the pressure sensing device concerning a 3rd embodiment of the present invention. 本発明の第４実施形態に係る圧力検出装置の一部断面図である。It is a partial cross section figure of the pressure sensing device concerning a 4th embodiment of the present invention. 本発明の第５実施形態に係る圧力検出装置の一部断面図である。It is a partial cross section figure of the pressure sensing device concerning a 5th embodiment of the present invention.

以下、本発明の実施形態について図に基づいて説明する。なお、以下の各実施形態相互において、互いに同一もしくは均等である部分には、図中、同一符号を付してある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

（第１実施形態）
以下、本発明の第１実施形態について図を参照して説明する。本実施形態に係る圧力検出装置は、燃焼室を構成する燃焼機構に取り付けられると共に、燃焼室の燃焼圧を検出する装置である。燃焼機構は、例えば車両に搭載されたエンジンである。そして、図１に示されるように、圧力検出装置１０は、ハウジング２０、胴体部３０、予荷重保持部４０、及びダイヤフラム６０を備えて構成されている。 (First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The pressure detection device according to the present embodiment is a device that is attached to a combustion mechanism that constitutes a combustion chamber and detects the combustion pressure in the combustion chamber. The combustion mechanism is an engine mounted on a vehicle, for example. As shown in FIG. 1, the pressure detection device 10 includes a housing 20, a body part 30, a preload holding part 40, and a diaphragm 60.

ハウジング２０は、圧力検出装置１０の外観をなす棒状の部品である。ハウジング２０は例えば金属材料で形成されている。ハウジング２０は、燃焼室側に設けられた凹部２１と、この凹部２１の繋がる貫通孔２２と、を有している。さらに、ハウジング２０は側壁に形成されたネジ部２３を有しており、このネジ部２３を介してエンジンブロックにネジ止めされる。なお、ハウジング２０のうち凹部２１とは反対側に図示しない回路基板やコネクタ等の部品が設けられている。 The housing 20 is a rod-like component that makes the appearance of the pressure detection device 10. The housing 20 is made of, for example, a metal material. The housing 20 includes a recess 21 provided on the combustion chamber side and a through hole 22 connected to the recess 21. Further, the housing 20 has a screw portion 23 formed on the side wall, and is screwed to the engine block via the screw portion 23. Note that components such as a circuit board and a connector (not shown) are provided on the opposite side of the housing 20 from the recess 21.

胴体部３０は、予荷重保持部４０を収容する中空筒状の部品である。胴体部３０は中空部３１を有し、この中空部３１に予荷重保持部４０を収容している。 The body part 30 is a hollow cylindrical part that houses the preload holding part 40. The body part 30 has a hollow part 31, and the preload holding part 40 is accommodated in the hollow part 31.

また、胴体部３０は、第１段差部３２及び第２段差部３３を有している。第１段差部３２は、胴体部３０の一方の開口端３４のうちの外壁面３５側が他方の開口端３６側に凹んだ部分である。この第１段差部３２にはダイヤフラム６０が溶接等で接合されている。 The body portion 30 includes a first step portion 32 and a second step portion 33. The first step portion 32 is a portion where the outer wall surface 35 side of the one opening end 34 of the body portion 30 is recessed toward the other opening end 36 side. A diaphragm 60 is joined to the first step portion 32 by welding or the like.

第２段差部３３は、一方の開口端３４とは反対側の他方の開口端３６のうちの内壁面３７側が一方の開口端３４側に凹んだ部分である。言い換えると、胴体部３０の内壁面３７のうちの他方の開口端３６側が胴体部３０の外壁面３５側に凹んだ部分である。また、第２段差部３３は胴体部３０のうち第２段差部３３の内径が、内壁面３７による内径よりも大きくなった部分であると言える。 The second step portion 33 is a portion where the inner wall surface 37 side of the other opening end 36 opposite to the one opening end 34 is recessed toward the one opening end 34. In other words, the other open end 36 side of the inner wall surface 37 of the body portion 30 is a portion recessed toward the outer wall surface 35 side of the body portion 30. Further, it can be said that the second stepped portion 33 is a portion of the body portion 30 where the inner diameter of the second stepped portion 33 is larger than the inner diameter of the inner wall surface 37.

さらに、胴体部３０は、外壁面３５に当該外壁面３５の一部が突出した突出部３８を有している。突出部３８は、ハウジング２０の開口端２４に溶接等で接合された部分である。これにより、胴体部３０のうちの他方の開口端３６側がハウジング２０の凹部２１に配置されていると共に、一方の開口端３４側がハウジング２０から突出している。 Further, the body portion 30 has a protruding portion 38 in which a part of the outer wall surface 35 protrudes on the outer wall surface 35. The protruding portion 38 is a portion joined to the opening end 24 of the housing 20 by welding or the like. Thus, the other opening end 36 side of the body portion 30 is disposed in the recess 21 of the housing 20, and the one opening end 34 side protrudes from the housing 20.

予荷重保持部４０は、ダイヤフラム６０から分離された部品であると共に、ダイヤフラム６０から伝わる荷重の大きさを検出するように構成されている。このような予荷重保持部４０は、荷重検出素子４１及び予荷重印加部４２を有している。 The preload holding unit 40 is a component separated from the diaphragm 60 and is configured to detect the magnitude of the load transmitted from the diaphragm 60. Such a preload holding unit 40 includes a load detection element 41 and a preload application unit 42.

荷重検出素子４１は、印加される荷重を検出するための板状の素子である。具体的に、荷重検出素子４１は、荷重が印加されることで荷重の大きさに応じた電荷を発生させるものであり、例えば圧電体で構成されている。したがって、荷重検出素子４１は、印加された荷重の大きさを例えば電圧に変換して出力する。 The load detection element 41 is a plate-like element for detecting an applied load. Specifically, the load detection element 41 generates an electric charge corresponding to the magnitude of the load when a load is applied, and is made of, for example, a piezoelectric body. Therefore, the load detection element 41 converts the magnitude of the applied load into, for example, a voltage and outputs the voltage.

なお、荷重検出素子４１は、ハウジング２０の中心軸方向に電荷を発生させるように構成されていても良い。一方、荷重検出素子４１は、ハウジング２０の中心軸方向に垂直な方向に電荷を発生させるように構成されていても良い。 The load detection element 41 may be configured to generate charges in the direction of the central axis of the housing 20. On the other hand, the load detection element 41 may be configured to generate charges in a direction perpendicular to the central axis direction of the housing 20.

予荷重印加部４２は、荷重検出素子４１を挟み込むと共に荷重検出素子４１に所定の予荷重を印加することで荷重検出素子４１に圧接された構造を有する。具体的に、予荷重印加部４２は、有底筒部４３、電極部４４、絶縁材４５、埋込部材４６、及び荷重部４７を有している。 The preload application unit 42 has a structure in which the load detection element 41 is sandwiched and pressed against the load detection element 41 by applying a predetermined preload to the load detection element 41. Specifically, the preload application unit 42 includes a bottomed cylindrical portion 43, an electrode portion 44, an insulating material 45, an embedded member 46, and a load portion 47.

有底筒部４３は、中空部４３ａを有する有底筒状の部品である。また、有底筒部４３は、荷重検出素子４１の一方の電極として機能する。有底筒部４３は、中空部４３ａを構成する内壁面４３ｂから離間するように荷重検出素子４１を中空部４３ａの底面４３ｃに配置させている。有底筒部４３は、例えばＳＵＳ６３０やＳＵＨ６６０等の金属材料によって形成されている。 The bottomed cylinder part 43 is a bottomed cylindrical part having a hollow part 43a. Further, the bottomed cylinder portion 43 functions as one electrode of the load detection element 41. The bottomed cylindrical portion 43 has the load detection element 41 arranged on the bottom surface 43c of the hollow portion 43a so as to be separated from the inner wall surface 43b constituting the hollow portion 43a. The bottomed cylinder part 43 is made of a metal material such as SUS630 or SUH660.

さらに、有底筒部４３は、つば部４３ｄを有している。つば部４３ｄは、有底筒部４３において胴体部３０の内壁面３７に対向する外壁面４３ｅの一部が突出した部分である。すなわち、つば部４３ｄは、予荷重保持部４０の外壁面に設けられていると言える。これにより、有底筒部４３の最大外径部が胴体部３０の最小内径部よりも大きくなっている。 Furthermore, the bottomed cylinder part 43 has a collar part 43d. The collar portion 43 d is a portion where a part of the outer wall surface 43 e that faces the inner wall surface 37 of the body portion 30 in the bottomed cylindrical portion 43 protrudes. That is, it can be said that the collar portion 43 d is provided on the outer wall surface of the preload holding portion 40. Thereby, the maximum outer diameter part of the bottomed cylindrical part 43 is larger than the minimum inner diameter part of the body part 30.

また、つば部４３ｄは、有底筒部４３の開口部４３ｆ側に設けられていると共に、第２段差部３３に配置されることで第２段差部３３に接触している。つば部４３ｄは、溶接やネジ等の方法によって第２段差部３３に接触している。 The collar portion 43 d is provided on the opening 43 f side of the bottomed cylindrical portion 43 and is in contact with the second stepped portion 33 by being disposed on the second stepped portion 33. The collar portion 43d is in contact with the second step portion 33 by a method such as welding or a screw.

さらに、本実施形態では、つば部４３ｄは有底筒部４３の外壁面４３ｅを一周するように連続して設けられている。なお、つば部４３ｄは有底筒部４３の外壁面４３ｅに断続的に設けられていても良い。 Further, in the present embodiment, the flange portion 43 d is continuously provided so as to go around the outer wall surface 43 e of the bottomed cylindrical portion 43. The collar portion 43d may be provided intermittently on the outer wall surface 43e of the bottomed cylindrical portion 43.

電極部４４は、有底筒部４３の中空部４３ａに壁面４３ｂから離間して配置されていると共に、荷重検出素子４１の他方の電極として機能する部品である。また、電極部４４は、荷重検出素子４１のうち有底筒部４３の底面４３ｃ側とは反対側に当接している。これにより、電極部４４は有底筒部４３の一部と共に荷重検出素子４１を挟んでいる。さらに、電極部４４は、荷重検出素子４１側とは反対側に荷重検出素子４１の信号を外部に出力するためのターミナル４４ａを有している。 The electrode portion 44 is a component that functions as the other electrode of the load detection element 41 while being spaced apart from the wall surface 43 b in the hollow portion 43 a of the bottomed cylindrical portion 43. The electrode portion 44 is in contact with the load detecting element 41 on the side opposite to the bottom surface 43 c side of the bottomed cylindrical portion 43. Thus, the electrode portion 44 sandwiches the load detection element 41 together with a part of the bottomed cylindrical portion 43. Furthermore, the electrode part 44 has a terminal 44a for outputting a signal of the load detection element 41 to the outside on the side opposite to the load detection element 41 side.

絶縁材４５は、有底筒部４３の中空部４３ａに配置されていると共に、電極部４４と荷重部４７とを絶縁するためのリング状の部品である。絶縁材４５は、電極部４４のうち荷重検出素子４１側とは反対側に当接している。絶縁材４５は、例えばアルミナ等のセラミックスで形成されている。絶縁材４５の中空部分には電極部４４のターミナル４４ａが通されている。 The insulating material 45 is a ring-shaped component that is disposed in the hollow portion 43 a of the bottomed tubular portion 43 and insulates the electrode portion 44 and the load portion 47. The insulating material 45 is in contact with the opposite side of the electrode portion 44 from the load detecting element 41 side. The insulating material 45 is made of ceramics such as alumina. A terminal 44 a of the electrode portion 44 is passed through the hollow portion of the insulating material 45.

埋込部材４６は、荷重検出素子４１、電極部４４、及び絶縁材４５と有底筒部４３の壁面４３ｂとを絶縁するための部品である。埋込部材４６は、有底筒部４３の中空部４３ａの隙間４３ｇに埋め込まれている。ここで、隙間４３ｇは、中空部４３ａのうち有底筒部４３の壁面４３ｂと荷重検出素子４１、電極部４４、及び絶縁材４５との間の空間である。埋込部材４６として、樹脂等の絶縁材料が採用される。これにより、埋込部材４６によって荷重検出素子４１や電極部４４と壁面４３ｂとの絶縁性を確保することができる。 The embedded member 46 is a component for insulating the load detecting element 41, the electrode portion 44, and the insulating material 45 from the wall surface 43 b of the bottomed cylindrical portion 43. The embedded member 46 is embedded in the gap 43g of the hollow portion 43a of the bottomed cylindrical portion 43. Here, the gap 43g is a space between the wall surface 43b of the bottomed cylindrical portion 43 and the load detecting element 41, the electrode portion 44, and the insulating material 45 in the hollow portion 43a. As the embedded member 46, an insulating material such as resin is employed. Thereby, the insulation between the load detection element 41 and the electrode part 44 and the wall surface 43b can be ensured by the embedded member 46.

荷重部４７は、絶縁材４５のうち電極部４４とは反対側に当接した部品である。荷重部４７は有底筒部４３の中心軸に平行な方向の断面が凸形状をなしている。そして、荷重部４７は、有底筒部４３の中心軸に垂直な方向において幅が狭い凸部分が絶縁材４５に接触している。また、荷重部４７は有底筒部４３の中心軸に沿って設けられた貫通孔４７ａを有している。この貫通孔４７ａに電極部４４のターミナル４４ａの先端部が位置する。 The load portion 47 is a component that is in contact with the side of the insulating material 45 opposite to the electrode portion 44. The load portion 47 has a convex cross section in a direction parallel to the central axis of the bottomed cylindrical portion 43. The load portion 47 is in contact with the insulating material 45 at a convex portion having a narrow width in the direction perpendicular to the central axis of the bottomed cylindrical portion 43. The load portion 47 has a through hole 47 a provided along the central axis of the bottomed cylindrical portion 43. The tip of the terminal 44a of the electrode portion 44 is located in the through hole 47a.

さらに、荷重部４７は、有底筒部４３の底面４３ｃとの間に位置する荷重検出素子４１、電極部４４、及び絶縁材４５に所定の予荷重を印加した状態で有底筒部４３の開口部４３ｆに溶接によって固定されている。所定の予荷重は、例えば１５０Ｎ以上である。このように所定の予荷重を印加する目的の１つは、燃焼室は正圧だけでなく負圧も発生するため、予荷重印加部４２に負圧が作用しても荷重検出素子４１が有底筒部４３または電極部４４から浮き上がって計測不能になることを避けるためである。もう１つの目的は、エンジンで異常燃焼が生じると衝撃波が発生するので、この衝撃波によって荷重検出素子４１が浮き上がって有底筒部４３の底部分や電極部４４に衝突することにより破損してしまうことを防止するためである。 Further, the load portion 47 is formed by applying a predetermined preload to the load detecting element 41, the electrode portion 44, and the insulating material 45 located between the bottom surface 43c of the bottomed tube portion 43 and the bottomed tube portion 43. It is fixed to the opening 43f by welding. The predetermined preload is, for example, 150 N or more. Thus, one purpose of applying a predetermined preload is that the combustion chamber generates not only positive pressure but also negative pressure, so that the load detecting element 41 is present even if negative pressure is applied to the preload application section 42. This is to prevent the measurement from being lifted up from the bottom cylinder part 43 or the electrode part 44. Another object is that when abnormal combustion occurs in the engine, a shock wave is generated, and the shock wave is lifted by the shock wave and is damaged by colliding with the bottom portion of the bottomed cylindrical portion 43 or the electrode portion 44. This is to prevent this.

ここで、予荷重印加部４２のうち、有底筒部４３、電極部４４、及び荷重部４７は、例えば同じ金属材料で形成されている。圧力検出装置１０は高温に晒されることになるため、各部品の熱膨張率に差を生じさせないようにするべく、各部品が同じ金属材料で形成されていることが好ましい。また、予荷重印加部４２は高耐圧性や高ヤング率（硬い）であることも要求される。このようなことから、有底筒部４３、電極部４４、及び荷重部４７は、例えばＳＵＳ６３０で形成されている。なお、ＳＵＨ６６０等の他の金属材料が用いられても良い。 Here, in the preload application section 42, the bottomed cylinder section 43, the electrode section 44, and the load section 47 are made of the same metal material, for example. Since the pressure detection device 10 is exposed to a high temperature, it is preferable that each component is formed of the same metal material so as not to cause a difference in the coefficient of thermal expansion of each component. Further, the preload application unit 42 is required to have high pressure resistance and high Young's modulus (hard). For this reason, the bottomed cylindrical portion 43, the electrode portion 44, and the load portion 47 are formed of, for example, SUS630. Other metal materials such as SUH660 may be used.

そして、予荷重印加部４２は、胴体部３０の内壁面３７に対してクリアランスを持って胴体部３０の中空部３１に配置されている。つまり、予荷重印加部４２は胴体部３０に対して圧入されていない。 The preload application unit 42 is disposed in the hollow portion 31 of the body unit 30 with a clearance from the inner wall surface 37 of the body unit 30. That is, the preload application unit 42 is not press-fitted into the body unit 30.

ダイヤフラム６０は、燃焼室の燃焼圧に基づく荷重を予荷重印加部４２を介して荷重検出素子４１に伝達させる部品である。ダイヤフラム６０は中央部が予荷重印加部４２の有底筒部４３に当接していると共に、外縁部が胴体部３０の第１段差部３２に接合されている。 The diaphragm 60 is a component that transmits a load based on the combustion pressure in the combustion chamber to the load detection element 41 via the preload application unit 42. The diaphragm 60 is in contact with the bottomed cylindrical portion 43 of the preload application portion 42 at the center, and the outer edge portion is joined to the first step portion 32 of the body portion 30.

上記の構成において、ハウジング２０の貫通孔２２に信号線７０が通されている。信号線７０の一端は荷重部４７の貫通孔４７ａに配置されると共に電極部４４のターミナル４４ａと電気的に接続されている。また、信号線７０の一部は荷重部４７の貫通孔４７ａに設けられた絶縁部４７ｂによって荷重部４７に固定されている。信号線７０の他端はハウジング２０に設けられた図示しないコネクタ部に電気的に接続されている。 In the above configuration, the signal line 70 is passed through the through hole 22 of the housing 20. One end of the signal line 70 is disposed in the through hole 47 a of the load portion 47 and is electrically connected to the terminal 44 a of the electrode portion 44. A part of the signal line 70 is fixed to the load portion 47 by an insulating portion 47 b provided in the through hole 47 a of the load portion 47. The other end of the signal line 70 is electrically connected to a connector portion (not shown) provided in the housing 20.

そして、予荷重保持部４０が胴体部３０の中空部３１に収容されると、有底筒部４３のつば部４３ｄが胴体部３０の第２段差部３３に接触する。これにより、有底筒部４３は胴体部３０及びハウジング２０を介してエンジンブロックと同じ電位に固定される。エンジンブロックの電位は例えば接地電位である。 Then, when the preload holding part 40 is accommodated in the hollow part 31 of the body part 30, the flange part 43 d of the bottomed cylinder part 43 comes into contact with the second step part 33 of the body part 30. Thereby, the bottomed cylindrical portion 43 is fixed to the same potential as the engine block via the body portion 30 and the housing 20. The potential of the engine block is, for example, a ground potential.

以上が、本実施形態に係る圧力検出装置１０の全体構成である。上記の構成によると、燃焼室で発生した衝撃がダイヤフラム６０に印加される。これにより、ダイヤフラム６０の衝撃が有底筒部４３を介して荷重検出素子４１に伝わる。荷重検出素子４１は印加された荷重の大きさに応じて電荷を発生させる。これにより、有底筒部４３と電極部４４との間の電圧が変化する。したがって、当該電圧の変化が信号線７０を介して外部に出力される。 The above is the overall configuration of the pressure detection device 10 according to the present embodiment. According to the above configuration, the impact generated in the combustion chamber is applied to the diaphragm 60. Thereby, the impact of the diaphragm 60 is transmitted to the load detection element 41 through the bottomed cylindrical portion 43. The load detection element 41 generates an electric charge according to the magnitude of the applied load. Thereby, the voltage between the bottomed cylinder part 43 and the electrode part 44 changes. Therefore, the voltage change is output to the outside via the signal line 70.

次に、圧力検出装置１０の製造方法について説明する。まず、エージング工程を行う。具体的には、図２に示されるように、荷重検出素子４１、有底筒部４３、電極部４４、絶縁材４５、及び荷重部４７を用意する。そして、固定治具８０に有底筒部４３を乗せると共に、有底筒部４３の中空部４３ａに荷重検出素子４１、電極部４４、絶縁材４５を順に収容する。 Next, a manufacturing method of the pressure detection device 10 will be described. First, an aging process is performed. Specifically, as shown in FIG. 2, a load detection element 41, a bottomed cylinder portion 43, an electrode portion 44, an insulating material 45, and a load portion 47 are prepared. Then, the bottomed cylindrical portion 43 is placed on the fixing jig 80, and the load detecting element 41, the electrode portion 44, and the insulating material 45 are sequentially accommodated in the hollow portion 43a of the bottomed cylindrical portion 43.

続いて、荷重部４７の上に荷重治具８１を乗せて荷重を掛ける。これにより、荷重治具８１を固定治具８０側に押し込む。具体的には、燃焼室に発生するであろう衝撃に基づく荷重よりも高い荷重を予荷重印加部４２に印加した状態で予荷重印加部４２を荷重検出素子４１に圧接する。 Subsequently, a load is applied by placing a load jig 81 on the load portion 47. Thereby, the load jig 81 is pushed into the fixing jig 80 side. Specifically, the preload application unit 42 is pressed against the load detection element 41 in a state where a load higher than the load based on the impact that will occur in the combustion chamber is applied to the preload application unit 42.

ここで、荷重部４７と有底筒部４３の底部分との間に位置する荷重検出素子４１、電極部４４、及び絶縁材４５に印加される所定の予荷重が１５０Ｎ以上となるように、予荷重印加部４２に荷重を印加した状態で、荷重検出素子４１と予荷重印加部４２とを一体化する。すなわち、バネ定数比によるスプリングバックを考慮して有底筒部４３の開口部４３ｆと荷重部４７とを溶接で固定する。 Here, the predetermined preload applied to the load detection element 41, the electrode part 44, and the insulating material 45 located between the load part 47 and the bottom part of the bottomed cylinder part 43 is 150 N or more. In a state where a load is applied to the preload application unit 42, the load detection element 41 and the preload application unit 42 are integrated. That is, the opening 43f of the bottomed cylindrical portion 43 and the load portion 47 are fixed by welding in consideration of the spring back due to the spring constant ratio.

これにより、実使用時よりも高い荷重が予荷重保持部４０に予め印加されるので、充分なエージングを行うことができる。さらに、予荷重保持部４０とダイヤフラム６０とが分離された構成であるので、予荷重保持部４０を製造する際に予荷重保持部４０に高い荷重を印加できるという利点もある。 Thereby, since a load higher than that in actual use is applied to the preload holding unit 40 in advance, sufficient aging can be performed. Further, since the preload holding unit 40 and the diaphragm 60 are separated, there is an advantage that a high load can be applied to the preload holding unit 40 when the preload holding unit 40 is manufactured.

この後、電極部４４のターミナル４４ａに信号線７０を接続して絶縁部４７ｂを設ける。また、予荷重保持部４０を胴体部３０の中空部３１に収容し、つば部４３ｄと第２段差部３３とを固定する。そして、胴体部３０の第１段差部３２にダイヤフラム６０を溶接する。さらに、信号線７０をハウジング２０の貫通孔２２に通しつつ、ハウジング２０に胴体部３０の突出部３８を接合する。また、信号線７０をハウジング２０のコネクタ部に接続する。こうして、圧力検出装置１０が完成する。 Thereafter, the signal line 70 is connected to the terminal 44a of the electrode portion 44 to provide the insulating portion 47b. Further, the preload holding part 40 is accommodated in the hollow part 31 of the body part 30, and the collar part 43d and the second step part 33 are fixed. Then, the diaphragm 60 is welded to the first step portion 32 of the body portion 30. Further, the protruding portion 38 of the body portion 30 is joined to the housing 20 while the signal line 70 is passed through the through hole 22 of the housing 20. Further, the signal line 70 is connected to the connector portion of the housing 20. Thus, the pressure detection device 10 is completed.

以上説明したように、本実施形態では、圧力検出装置１０は、荷重検出素子４１に予荷重を印加する予荷重保持部４０と、圧力を受圧するダイヤフラム６０と、が分離された構造を備えていることが特徴となっている。このように、予荷重が印加される部分と圧力が印加される部分とが分離されているので、ダイヤフラム６０を高強度にするためにダイヤフラム６０のバネ定数を大きくしなくても良いという利点がある。すなわち、ダイヤフラム６０のバネ定数を小さくすることができるので、ダイヤフラム６０を高感度に構成することができる。これに対し、荷重検出素子４１に印加する予荷重を保持するために予荷重印加部４２を高強度な構成とすることができる。本実施形態では、有底筒部４３の電極部分と筒部分とが予め一体化されているので予荷重保持部４０を高強度に構成することができる。したがって、圧力検出装置１０において高強度と高感度との両立を図ることができる。 As described above, in the present embodiment, the pressure detection device 10 includes a structure in which the preload holding unit 40 that applies a preload to the load detection element 41 and the diaphragm 60 that receives pressure are separated. It is a feature. Thus, since the part to which the preload is applied and the part to which the pressure is applied are separated, there is an advantage that it is not necessary to increase the spring constant of the diaphragm 60 in order to increase the strength of the diaphragm 60. is there. That is, since the spring constant of the diaphragm 60 can be reduced, the diaphragm 60 can be configured with high sensitivity. On the other hand, in order to hold the preload applied to the load detection element 41, the preload application unit 42 can be configured to have a high strength. In this embodiment, since the electrode part and the cylinder part of the bottomed cylinder part 43 are integrated beforehand, the preload holding part 40 can be comprised with high intensity | strength. Therefore, it is possible to achieve both high strength and high sensitivity in the pressure detection device 10.

特に、ダイヤフラム６０に負圧が作用して荷重検出素子４１が有底筒部４３や電極部４４から浮き上がって計測不能になることを避けることができる。もちろん、正圧だけでなく負圧も計測可能となる。また、エンジンでプレイグニッションのような異常燃焼が生じた際のノッキングで発生する衝撃波によって荷重検出素子４１が浮き上がって電極部４４等に衝突すると破損に至ることがある。しかしながら、予荷重保持部４０は高い予荷重を保持しているので、この衝撃波による荷重検出素子４１の浮き上がりを防止できる。 In particular, it can be avoided that a negative pressure acts on the diaphragm 60 and the load detection element 41 is lifted from the bottomed cylindrical portion 43 or the electrode portion 44 and cannot be measured. Of course, not only positive pressure but also negative pressure can be measured. Further, when the load detecting element 41 is lifted by a shock wave generated by knocking when abnormal combustion such as pre-ignition occurs in the engine and collides with the electrode portion 44 or the like, damage may occur. However, since the preload holding unit 40 holds a high preload, it is possible to prevent the load detection element 41 from being lifted by the shock wave.

また、予荷重保持部４０に設けられたつば部４３ｄが胴体部３０の第２段差部３３に引っ掛かる構造になっている。このため、異常燃焼時に、想定外の衝撃波がダイヤフラム６０に作用して、万が一、ダイヤフラム６０が破れたとしても、予荷重保持部４０が燃焼室に脱落することを防止することができる。 In addition, the collar portion 43 d provided in the preload holding portion 40 is configured to be caught by the second step portion 33 of the body portion 30. For this reason, at the time of abnormal combustion, even if an unexpected shock wave acts on the diaphragm 60 and the diaphragm 60 is torn, it is possible to prevent the preload holding unit 40 from falling into the combustion chamber.

なお、本実施形態の記載と特許請求の範囲の記載との対応関係については、胴体部３０の中空部３１が特許請求の範囲の「第１中空部」に対応し、胴体部３０の第２段差部３３が特許請求の範囲の「段差部」に対応する。また、有底筒部４３の中空部４３ａが特許請求の範囲の「第２中空部」に対応し、有底筒部４３の外壁面４３ｅが特許請求の範囲の「予荷重保持部の外壁面」に対応する。 As for the correspondence between the description of the present embodiment and the description of the claims, the hollow portion 31 of the trunk portion 30 corresponds to the “first hollow portion” of the claims, and the second portion of the trunk portion 30. The step portion 33 corresponds to a “step portion” in the claims. The hollow portion 43a of the bottomed cylindrical portion 43 corresponds to the “second hollow portion” in the claims, and the outer wall surface 43e of the bottomed cylindrical portion 43 is the “outer wall surface of the preload holding portion” in the claims. ".

（第２実施形態）
本実施形態では、第１実施形態と異なる部分について説明する。図３に示されるように、予荷重印加部４２は、筒部４８、台座４９、電極部４４、絶縁材４５、埋込部材４６、及び荷重部４７を有して構成されている。このうち、電極部４４、絶縁材４５、埋込部材４６、及び荷重部４７は第１実施形態で示されたものと同じである。 (Second Embodiment)
In the present embodiment, parts different from the first embodiment will be described. As shown in FIG. 3, the preload application unit 42 includes a cylindrical portion 48, a pedestal 49, an electrode portion 44, an insulating material 45, an embedded member 46, and a load portion 47. Among these, the electrode part 44, the insulating material 45, the embedding member 46, and the load part 47 are the same as those shown in the first embodiment.

筒部４８は、中空部４８ａを有する中空筒状の部品である。筒部４８は、中空部４８ａを構成する内壁面４８ｂから離間するように荷重検出素子４１を中空部４８ａに収容している。また、筒部４８は当該筒部４８の外壁面４８ｃにつば部４８ｄを有している。つば部４８ｄは、胴体部３０の第２段差部３３に配置されている。 The cylindrical part 48 is a hollow cylindrical part having a hollow part 48a. The cylindrical portion 48 accommodates the load detection element 41 in the hollow portion 48a so as to be separated from the inner wall surface 48b constituting the hollow portion 48a. Further, the cylindrical portion 48 has a collar portion 48 d on the outer wall surface 48 c of the cylindrical portion 48. The collar portion 48 d is disposed in the second step portion 33 of the body portion 30.

台座４９は、筒部４８のうちの一方の開口部４８ｅに固定された板状の部品である。また、台座４９は、荷重検出素子４１に当接すると共に荷重検出素子４１の一方の電極として機能する。すなわち、台座４９は、荷重検出素子４１の保持と電極との両方を兼ねている。そして、台座４９は筒部４８の内径と同じサイズであり、筒部４８の一方の開口部４８ｅのうちの開口端付近で溶接によって筒部４８に固定されている。 The pedestal 49 is a plate-like component that is fixed to one opening 48 e of the cylindrical portion 48. Further, the pedestal 49 abuts on the load detection element 41 and functions as one electrode of the load detection element 41. That is, the pedestal 49 serves as both the holding of the load detection element 41 and the electrode. The pedestal 49 has the same size as the inner diameter of the cylindrical portion 48, and is fixed to the cylindrical portion 48 by welding in the vicinity of the opening end of one opening 48e of the cylindrical portion 48.

電極部４４は、筒部４８の中空部４８ａに内壁面４８ｂから離間して配置されている。また、電極部４４は、荷重検出素子４１のうち台座４９とは反対側に当接している。絶縁材４５は、筒部４８の中空部４８ａに配置されている。また、絶縁材４５は電極部４４のうち荷重検出素子４１とは反対側に当接している。 The electrode portion 44 is disposed in the hollow portion 48a of the cylindrical portion 48 so as to be separated from the inner wall surface 48b. Further, the electrode portion 44 is in contact with the side of the load detection element 41 opposite to the pedestal 49. The insulating material 45 is disposed in the hollow portion 48 a of the cylindrical portion 48. The insulating material 45 is in contact with the side of the electrode portion 44 opposite to the load detecting element 41.

荷重部４７は、絶縁材４５のうち電極部４４とは反対側に当接している。また、荷重部４７は、台座４９との間に位置する荷重検出素子４１、電極部４４、及び絶縁材４５に所定の予荷重を印加した状態で筒部４８のうちの他方の開口部４８ｆに固定されている。 The load portion 47 is in contact with the side of the insulating material 45 opposite to the electrode portion 44. Further, the load portion 47 is placed in the other opening 48 f of the cylindrical portion 48 in a state where a predetermined preload is applied to the load detection element 41, the electrode portion 44, and the insulating material 45 positioned between the pedestal 49. It is fixed.

以上のように、筒部４８と台座４９とを分離した構造とすることもできる。このような構造によると、予荷重保持部４０を製造しやすいというメリットがある。また、予荷重保持部４０の構成が筒部４８と台座４９とに分離しているので、台座４９の端面の加工精度（面粗度、平面度）の確保が容易になる。 As described above, the cylindrical portion 48 and the pedestal 49 can be separated. According to such a structure, there is an advantage that the preload holding part 40 can be easily manufactured. Further, since the configuration of the preload holding portion 40 is separated into the cylindrical portion 48 and the pedestal 49, it is easy to ensure the processing accuracy (surface roughness, flatness) of the end surface of the pedestal 49.

なお、本実施形態の記載と特許請求の範囲の記載との対応関係については、筒部４８の中空部４８ａが特許請求の範囲の「第２中空部」に対応し、筒部４８の外壁面４８ｃが特許請求の範囲の「予荷重保持部の外壁面」に対応する。 In addition, regarding the correspondence between the description of the present embodiment and the description of the claims, the hollow portion 48a of the cylindrical portion 48 corresponds to the “second hollow portion” of the claims, and the outer wall surface of the cylindrical portion 48 48c corresponds to the “outer wall surface of the preload holding portion” in the claims.

（第３実施形態）
本実施形態では、第１、第２実施形態と異なる部分について説明する。図４に示されるように、予荷重印加部４２は、台座４９、電極部４４、絶縁材４５、及び荷重部５０を有して構成されている。このうち、電極部４４及び絶縁材４５は第１実施形態で示されたものと同じであり、台座４９は第２実施形態で示されたものと同じである。 (Third embodiment)
In the present embodiment, parts different from the first and second embodiments will be described. As shown in FIG. 4, the preload application unit 42 includes a pedestal 49, an electrode unit 44, an insulating material 45, and a load unit 50. Among these, the electrode part 44 and the insulating material 45 are the same as those shown in the first embodiment, and the pedestal 49 is the same as that shown in the second embodiment.

荷重部５０は、中空部５０ａを有する有底筒状の部品である。また、荷重部５０は、絶縁材４５が中空部５０ａの底面５０ｂに当接すると共に荷重検出素子４１及び電極部４４が中空部５０ａを構成する内壁面５０ｃから離間して配置されている。さらに、荷重部５０は、台座４９との間に位置する荷重検出素子４１、電極部４４、及び絶縁材４５に所定の予荷重を印加した状態で開口部５０ｄが台座４９に溶接で固定されている。そして、本実施形態では、荷重部５０が当該荷重部５０の外壁面５０ｅにつば部５０ｆを有している。 The load part 50 is a bottomed cylindrical part having a hollow part 50a. The load portion 50 is disposed such that the insulating material 45 abuts against the bottom surface 50b of the hollow portion 50a and the load detection element 41 and the electrode portion 44 are spaced apart from the inner wall surface 50c constituting the hollow portion 50a. Further, the load portion 50 has an opening 50 d fixed to the pedestal 49 by welding in a state where a predetermined preload is applied to the load detecting element 41, the electrode portion 44, and the insulating material 45 positioned between the pedestal 49 and the load portion 50. Yes. In the present embodiment, the load portion 50 has a flange portion 50 f on the outer wall surface 50 e of the load portion 50.

以上のように、荷重部５０に荷重検出素子４１等を収容する容器としての機能を持たせることができる。このような構造によると、荷重印加部分と筒部分とが予め一体化されているので予荷重保持部４０を高強度に構成することができる。なお、本実施形態の記載と特許請求の範囲の記載との対応関係については、荷重部５０の中空部５０ａが特許請求の範囲の「第２中空部」に対応し、荷重部５０の外壁面５０ｅが特許請求の範囲の「予荷重保持部の外壁面」に対応する。 As described above, the load portion 50 can have a function as a container for accommodating the load detection element 41 and the like. According to such a structure, since the load application portion and the cylinder portion are integrated in advance, the preload holding portion 40 can be configured with high strength. As for the correspondence between the description of the present embodiment and the description of the claims, the hollow portion 50a of the load portion 50 corresponds to the “second hollow portion” of the claims, and the outer wall surface of the load portion 50 50e corresponds to the “outer wall surface of the preload holding portion” in the claims.

（第４実施形態）
本実施形態では、第１〜第３実施形態と異なる部分について説明する。図５に示されるように、予荷重印加部４２は、筒部４８、台座４９、電極部４４、及び絶縁材５１を有して構成されている。 (Fourth embodiment)
In the present embodiment, parts different from the first to third embodiments will be described. As shown in FIG. 5, the preload application unit 42 includes a cylindrical part 48, a pedestal 49, an electrode part 44, and an insulating material 51.

本実施形態では、絶縁材５１は、電極部４４のうち荷重検出素子４１とは反対側に当接すると共に、台座４９との間に位置する荷重検出素子４１及び電極部４４に所定の予荷重を印加した状態で筒部４８のうちの他方の開口部４８ｆに接着剤等で固定されている。なお、絶縁材５１が溶接可能な材料で形成されている場合、絶縁材５１は筒部４８に溶接で固定されていても良い。 In the present embodiment, the insulating material 51 abuts on the opposite side of the electrode portion 44 to the load detection element 41 and applies a predetermined preload to the load detection element 41 and the electrode portion 44 located between the base 49. In the applied state, it is fixed to the other opening 48f of the cylindrical portion 48 with an adhesive or the like. When the insulating material 51 is formed of a weldable material, the insulating material 51 may be fixed to the cylindrical portion 48 by welding.

さらに、絶縁材５１は、筒部４８の中心軸に沿って設けられた貫通孔５１ａを有している。信号線７０はこの貫通孔５１ａにおいて電極部４４のターミナル４４ａに電気的に接続される。 Furthermore, the insulating material 51 has a through hole 51 a provided along the central axis of the cylindrical portion 48. The signal line 70 is electrically connected to the terminal 44a of the electrode portion 44 through the through hole 51a.

以上のように、予荷重印加部４２は、台座４９と絶縁材５１とによって荷重検出素子４１に所定の予荷重を印加する構造とすることもできる。 As described above, the preload application unit 42 may be configured to apply a predetermined preload to the load detection element 41 by the pedestal 49 and the insulating material 51.

（第５実施形態）
本実施形態では、第１実施形態と異なる部分について説明する。図６に示されるように、本実施形態では、胴体部３０とダイヤフラム６０とは別体ではなく１つの有底筒状の部材から構成されている。したがって、有底筒状の部材の筒部分が胴体部３０として構成されていると共に、当該有底筒状の部材の底部分がダイヤフラム６０として構成されている。このように、胴体部３０とダイヤフラム６０とが一体的に繋がった部品として構成されていても良い。 (Fifth embodiment)
In the present embodiment, parts different from the first embodiment will be described. As shown in FIG. 6, in the present embodiment, the body portion 30 and the diaphragm 60 are not separate bodies but are configured from one bottomed cylindrical member. Accordingly, the cylindrical portion of the bottomed cylindrical member is configured as the body portion 30, and the bottom portion of the bottomed cylindrical member is configured as the diaphragm 60. Thus, the body part 30 and the diaphragm 60 may be configured as a part integrally connected.

（他の実施形態）
上記各実施形態で示された圧力検出装置１０の構成は一例であり、上記で示した構成に限定されることなく、本発明を実現できる他の構成とすることもできる。例えば、ハウジング２０の構成は一例であり、他の構成としても良い。また、予荷重印加部４２を構成する材料は、全て同じ材料で構成されていなくても良い。 (Other embodiments)
The configuration of the pressure detection device 10 shown in each of the above embodiments is an example, and is not limited to the configuration shown above, and may be another configuration that can realize the present invention. For example, the configuration of the housing 20 is an example, and other configurations may be used. Moreover, the material which comprises the preload application part 42 does not need to be comprised with the same material altogether.

また、上記各実施形態で示された埋込部材４６は必須のものではなく、設けられていなくても良い。さらに、第５実施形態で示された構造を、第２〜第４実施形態で示された構造に適用しても良い。 Further, the embedded member 46 shown in each of the above embodiments is not essential and may not be provided. Furthermore, the structure shown in the fifth embodiment may be applied to the structure shown in the second to fourth embodiments.

３０胴体部
３１中空部（第１中空部）
３３段差部
３４、３６開口端
３７内壁面
４０予荷重保持部
４１荷重検出素子
４２予荷重印加部
４３ｄつば部
４３ｅ外壁面
６０ダイヤフラム 30 body part 31 hollow part (1st hollow part)
33 Stepped portions 34, 36 Open ends 37 Inner wall surface 40 Preload holding portion 41 Load detecting element 42 Preload applying portion 43d collar portion 43e Outer wall surface 60 Diaphragm

Claims

A pressure detection device that is attached to a combustion mechanism constituting a combustion chamber and detects a combustion pressure in the combustion chamber,
A load detection element (41) for detecting an applied load and the load detection element (41) are sandwiched and a predetermined preload is applied to the load detection element (41) to thereby apply a load to the load detection element (41). A preload holding section (40) having a preload application section (42) in pressure contact;
The load detecting element (41) is disposed in the combustion chamber and is in contact with the preload application section (42), and a load based on the combustion pressure in the combustion chamber is passed through the preload application section (42). A diaphragm (60) to be transmitted to
A hollow cylinder having a first hollow portion (31), the preload holding portion (40) is accommodated in the first hollow portion (31), and the diaphragm (60) is provided at one open end (34). A fixed body part (30);
With
The trunk portion (30) is a step in which the inner wall surface (37) side of the other opening end (36) opposite to the one opening end (34) is recessed toward the one opening end (34). Part (33),
The preload holding portion (40) has a portion of the outer wall surface (43e, 48c, 50e) on the outer wall surface (43e, 48c, 50e) facing the inner wall surface (37) of the body portion (30). It has a flange portion (43d, 48d, 50f) that protrudes and contacts the step portion (33) by being disposed on the step portion (33) ,
The preload application section (42)
It has a bottomed cylindrical shape having a second hollow portion (43a) and functions as one electrode of the load detecting element (41), and is separated from an inner wall surface (43b) constituting the second hollow portion (43a). The bottomed tube portion (43) in which the load detecting element (41) is disposed on the bottom surface (43c) of the second hollow portion (43a),
The second hollow portion (43a) is disposed away from the inner wall surface (43b), contacts the opposite side of the load detecting element (41) from the bottom surface (43c) side, and further the load An electrode portion (44) functioning as the other electrode of the detection element (41);
An insulating material (45) disposed in the second hollow portion (43a) and in contact with the side opposite to the load detection element (41) side of the electrode portion (44);
The load detecting element (41), the electrode part (44), and the electrode member (44), which are in contact with the opposite side to the electrode part (44) of the insulating material (45) and located between the bottom surface (43c) and A load portion (47) fixed to the opening (43f) of the bottomed tubular portion (43) in a state where the predetermined preload is applied to the insulating material (45);
It is configured with
The said flange part (43d) is provided in the outer wall surface (43e) of the said bottomed cylinder part (43), The pressure detection apparatus characterized by the above-mentioned .

A pressure detection device that is attached to a combustion mechanism constituting a combustion chamber and detects a combustion pressure in the combustion chamber,
A load detection element (41) for detecting an applied load and the load detection element (41) are sandwiched and a predetermined preload is applied to the load detection element (41) to thereby apply a load to the load detection element (41). A preload holding section (40) having a preload application section (42) in pressure contact;
The load detecting element (41) is disposed in the combustion chamber and is in contact with the preload application section (42), and a load based on the combustion pressure in the combustion chamber is passed through the preload application section (42). A diaphragm (60) to be transmitted to
A hollow cylinder having a first hollow portion (31), the preload holding portion (40) is accommodated in the first hollow portion (31), and the diaphragm (60) is provided at one open end (34). A fixed body part (30);
With
The trunk portion (30) is a step in which the inner wall surface (37) side of the other opening end (36) opposite to the one opening end (34) is recessed toward the one opening end (34). Part (33),
The preload holding portion (40) has a portion of the outer wall surface (43e, 48c, 50e) on the outer wall surface (43e, 48c, 50e) facing the inner wall surface (37) of the body portion (30). It has a flange portion (43d, 48d, 50f) that protrudes and contacts the step portion (33) by being disposed on the step portion (33) ,
The preload application section (42)
The load detecting element (41) has a hollow cylindrical shape having a second hollow portion (48a), and the load detecting element (41) is separated from an inner wall surface (48b) constituting the second hollow portion (48a). A cylinder (48) arranged in 48a);
A base (49) that contacts the load detection element (41) and functions as one electrode of the load detection element (41), and is fixed to one opening (48e) of the cylindrical part (48). When,
The second hollow portion (48a) is spaced apart from the inner wall surface (48b), contacts the opposite side of the load detection element (41) from the pedestal (49), and further detects the load. An electrode part (44) functioning as the other electrode of the element (41);
An insulating material (45) disposed in the second hollow portion (48a) and in contact with the opposite side of the electrode portion (44) from the load detection element (41);
The load detecting element (41), the electrode part (44), and the electrode member (44) that are in contact with the opposite side of the electrode part (44) of the insulating material (45) and located between the base (49) and A load portion (47) fixed to the other opening (48f) of the cylindrical portion (48) in a state where the predetermined preload is applied to the insulating material (45);
It is configured with
The said flange part (48d) is provided in the outer wall surface (48c) of the said cylinder part (48), The pressure detection apparatus characterized by the above-mentioned .

A pressure detection device that is attached to a combustion mechanism constituting a combustion chamber and detects a combustion pressure in the combustion chamber,
A load detection element (41) for detecting an applied load and the load detection element (41) are sandwiched and a predetermined preload is applied to the load detection element (41) to thereby apply a load to the load detection element (41). A preload holding section (40) having a preload application section (42) in pressure contact;
The load detecting element (41) is disposed in the combustion chamber and is in contact with the preload application section (42), and a load based on the combustion pressure in the combustion chamber is passed through the preload application section (42). A diaphragm (60) to be transmitted to
A hollow cylinder having a first hollow portion (31), the preload holding portion (40) is accommodated in the first hollow portion (31), and the diaphragm (60) is provided at one open end (34). A fixed body part (30);
With
The trunk portion (30) is a step in which the inner wall surface (37) side of the other opening end (36) opposite to the one opening end (34) is recessed toward the one opening end (34). Part (33),
The preload holding portion (40) has a portion of the outer wall surface (43e, 48c, 50e) on the outer wall surface (43e, 48c, 50e) facing the inner wall surface (37) of the body portion (30). It has a flange portion (43d, 48d, 50f) that protrudes and contacts the step portion (33) by being disposed on the step portion (33) ,
The preload application section (42)
A pedestal (49) that contacts the load detection element (41) and functions as one electrode of the load detection element (41);
An electrode portion (44) that contacts the opposite side of the pedestal (49) of the load detection element (41) and further functions as the other electrode of the load detection element (41);
An insulating material (45) in contact with the load detection element (41) on the opposite side of the electrode portion (44);
It has a bottomed cylindrical shape having a second hollow portion (50a), and the insulating material (45) contacts the bottom surface (50b) of the second hollow portion (50a), and the load detecting element (41) and the electrode The load detecting element (41), the portion (44) being spaced apart from the inner wall surface (50c) constituting the second hollow portion (50a), and being positioned between the pedestal (49), A load portion (50) in which an opening (50d) is fixed to the pedestal (49) in a state where the predetermined preload is applied to the electrode portion (44) and the insulating material (45);
It is configured with
The said flange part (50f) is provided in the outer wall surface (50e) of the said load part (50), The pressure detection apparatus characterized by the above-mentioned .

A pressure detection device that is attached to a combustion mechanism constituting a combustion chamber and detects a combustion pressure in the combustion chamber,
A load detection element (41) for detecting an applied load and the load detection element (41) are sandwiched and a predetermined preload is applied to the load detection element (41) to thereby apply a load to the load detection element (41). A preload holding section (40) having a preload application section (42) in pressure contact;
The load detecting element (41) is disposed in the combustion chamber and is in contact with the preload application section (42), and a load based on the combustion pressure in the combustion chamber is passed through the preload application section (42). A diaphragm (60) to be transmitted to
A hollow cylinder having a first hollow portion (31), the preload holding portion (40) is accommodated in the first hollow portion (31), and the diaphragm (60) is provided at one open end (34). A fixed body part (30);
With
The trunk portion (30) is a step in which the inner wall surface (37) side of the other opening end (36) opposite to the one opening end (34) is recessed toward the one opening end (34). Part (33),
The preload holding portion (40) has a portion of the outer wall surface (43e, 48c, 50e) on the outer wall surface (43e, 48c, 50e) facing the inner wall surface (37) of the body portion (30). It has a flange portion (43d, 48d, 50f) that protrudes and contacts the step portion (33) by being disposed on the step portion (33) ,
The preload application section (42)
The load detecting element (41) has a hollow cylindrical shape having a second hollow portion (48a), and the load detecting element (41) is separated from an inner wall surface (48b) constituting the second hollow portion (48a). A cylinder (48) arranged in 48a);
A base (49) that contacts the load detection element (41) and functions as one electrode of the load detection element (41), and is fixed to one opening (48e) of the cylindrical part (48). When,
The second hollow portion (48a) is spaced apart from the inner wall surface (48b), contacts the opposite side of the load detection element (41) from the pedestal (49), and further detects the load. An electrode part (44) functioning as the other electrode of the element (41);
The electrode portion (44) contacts the opposite side of the load detection element (41) and is positioned between the load detection element (41) and the electrode portion (44) positioned between the pedestal (49). An insulating material (51) fixed to the other opening (48f) of the cylindrical portion (48) in a state where the predetermined preload is applied;
It is configured with
The said flange part (48d) is provided in the outer wall surface (48c) of the said cylinder part (48), The pressure detection apparatus characterized by the above-mentioned .

The said preload application part (42) has the embedding member (46) embedded in the clearance gap (43g) of a said 2nd hollow part (43a, 48a, 50a), The pressure detection apparatus as described in any one of thru | or 4.