JP2020153362A - Support structure of assembly camshaft - Google Patents

Support structure of assembly camshaft Download PDF

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JP2020153362A
JP2020153362A JP2019200595A JP2019200595A JP2020153362A JP 2020153362 A JP2020153362 A JP 2020153362A JP 2019200595 A JP2019200595 A JP 2019200595A JP 2019200595 A JP2019200595 A JP 2019200595A JP 2020153362 A JP2020153362 A JP 2020153362A
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shaft
support member
support structure
shafts
support
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柴田　学
Manabu Shibata
学 柴田
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Otics Corp
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Otics Corp
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Priority to US16/793,707 priority Critical patent/US20200300349A1/en
Priority to CN202010187912.XA priority patent/CN111706415A/en
Publication of JP2020153362A publication Critical patent/JP2020153362A/en
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Abstract

To provide a support structure of an assembly camshaft facilitating assembling of assembly camshafts and support members.SOLUTION: A support structure 1 of an assembly camshaft includes: a pair of assembly camshafts 2, 2 having a pair of shafts 21, 21 arranged parallel to each other and a plurality of cam pieces 22 externally fitted to each of the pair of shafts 21, 21, respectively; a plurality of support members 3 independent from each other, each of which has a pair of bearings 32, 32 into which each of the pair of shafts 21, 21 is inserted and has the bearings 32 including inner peripheral surfaces 32b continuous without joints over the whole periphery; and a plurality of positioning sections 4 each of which includes a pore section 4a into which the shaft 21 is inserted and which fastens the shaft 21 from the outside, and is assigned to both adjacent sides of each support member 3 so that the plurality of support members 3 in a state in which the shafts 21 are inserted into the bearings 32 are positioned respectively in an axial direction of the shafts 21.SELECTED DRAWING: Figure 1

Description

本発明は、組立カムシャフトの支持構造に関する。 The present invention relates to a support structure for an assembled camshaft.

組立カムシャフトと、それを支持する支持部材とを有する組立カムシャフトの支持構造（以下、支持構造）が知られている。この種の支持構造では、組立カムシャフトのジャーナルを支持するために、軸受（ジャーナル軸受）を含む支持部材が用いられている。支持部材は、複数の軸受を備えており、組立カムシャフトは、軸方向に並ぶ複数の軸受によって支持される。このような支持部材としては、例えば、特許文献１に示されるように、ジャーナルが挿通される軸受の孔部の内周面が、全周に亘って継ぎ目なく連続している一体型（単一部品）のものが知られている。一体型の支持部材は、例えば、軸受の内周面が上下で二分割される分割型の支持部材と比べて、軸心の偏心が抑制され、しかも、軸受の内周面に潤滑油が均一に行き渡り易い等の利点を有している。なお、支持構造は、最終的に、内燃機関のシリンダヘッドに対して、ボルト締め等により固定される。 A support structure (hereinafter referred to as a support structure) for an assembled camshaft having an assembled camshaft and a support member for supporting the assembled camshaft is known. In this type of support structure, a support member including a bearing (journal bearing) is used to support the journal of the assembled camshaft. The support member comprises a plurality of bearings, and the assembled camshaft is supported by a plurality of bearings arranged in the axial direction. As such a support member, for example, as shown in Patent Document 1, an integrated type (single) in which the inner peripheral surface of the hole of the bearing through which the journal is inserted is seamlessly continuous over the entire circumference. (Parts) are known. Compared to, for example, a split type support member in which the inner peripheral surface of the bearing is divided into upper and lower parts, the integrated support member suppresses the eccentricity of the axial center, and the lubricating oil is uniform on the inner peripheral surface of the bearing. It has advantages such as easy distribution. The support structure is finally fixed to the cylinder head of the internal combustion engine by tightening bolts or the like.

特開２００８−１５７０６２号公報JP-A-2008-157062

従来の支持部材は、複数の軸受が列状に配置されるように、それらの周りを囲む枠体によって軸受同士が互いに繋がっている。このような支持部材に、組立カムシャフトを取り付ける場合、組立カムシャフトを構成するシャフトを、支持部材の軸受に挿通させつつ、そのシャフトに複数のカムピースを焼き嵌め等により、一度にまとめて取り付ける必要があった。そのため、従来の支持部材に、組立カムシャフトを取り付ける作業は難しく、問題となっていた。また、支持部材に枠体が設けられていると、シャフトにカムピースを取り付ける際の作業スペースを確保することが難しい場合があった。例えば、焼き嵌めによってカムピースをシャフトに取り付ける場合に、軸受の周囲に、カムピースを保持させる冶具を配置することが難しい場合があった。 In the conventional support member, the bearings are connected to each other by a frame body surrounding them so that a plurality of bearings are arranged in a row. When attaching an assembled camshaft to such a support member, it is necessary to insert the shaft constituting the assembled camshaft through the bearing of the support member and attach a plurality of campieces to the shaft at once by shrink fitting or the like. was there. Therefore, it is difficult to attach the assembled camshaft to the conventional support member, which has been a problem. Further, when the support member is provided with the frame body, it may be difficult to secure a work space when attaching the cam piece to the shaft. For example, when the cam piece is attached to the shaft by shrink fitting, it may be difficult to arrange a jig for holding the cam piece around the bearing.

本発明の目的は、組立カムシャフト及び支持部材の組み付けが容易な組立カムシャフトの支持構造を提供することである。 An object of the present invention is to provide a support structure for an assembled camshaft in which the assembled camshaft and the support member can be easily assembled.

本発明に係る組立カムシャフトの支持構造は、互いに平行に配される１組のシャフトと、各シャフトに対してそれぞれ複数ずつ外嵌される複数のカムピースとを有する１組の組立カムシャフトと、各々が、１組の前記シャフトをそれぞれ挿通させる１組の軸受を有し、かつ前記軸受が、全周に亘って継ぎ目なく連続している内周面を含む、互いに独立した複数の支持部材と、各々が、前記シャフトを挿通させかつ前記シャフトを外側から締め付ける孔部を含み、前記軸受に前記シャフトが挿通されている状態の複数の前記支持部材が、前記シャフトの軸方向でそれぞれ位置決めされるように、各支持部材の両隣に割り当てられる複数の位置決め部とを備える。 The support structure of the assembled camshaft according to the present invention includes a set of shafts arranged in parallel with each other, and a set of assembled camshafts having a plurality of campieces fitted to each shaft. Each has a set of bearings through which the shafts are inserted, and the bearings have a plurality of independent support members including an inner peripheral surface that is seamlessly continuous over the entire circumference. A plurality of the support members, each of which includes a hole through which the shaft is inserted and tightens the shaft from the outside, and the shaft is inserted into the bearing, are respectively positioned in the axial direction of the shaft. As described above, a plurality of positioning portions assigned to both sides of each support member are provided.

本発明によれば、組立カムシャフト及び支持部材の組み付けが容易な組立カムシャフトの支持構造を提供することができる。 According to the present invention, it is possible to provide a support structure for an assembled camshaft in which the assembled camshaft and the support member can be easily assembled.

実施形態１に係る組立カムシャフトの支持構造の一部を表した平面図Top view showing a part of the support structure of the assembled camshaft according to the first embodiment. カムピースの斜視図Perspective view of the cam piece 支持部材の斜視図Perspective view of the support member 位置決め部の斜視図Perspective view of the positioning part 組立カムシャフトの支持構造の組立工程を示す説明図An explanatory view showing an assembly process of a support structure for an assembly camshaft. 組立カムシャフトの支持構造の組立工程を示す説明図An explanatory view showing an assembly process of a support structure for an assembly camshaft. 組立カムシャフトの支持構造の組立工程を示す説明図An explanatory view showing an assembly process of a support structure for an assembly camshaft. 組立カムシャフトの支持構造の組立工程を示す説明図An explanatory view showing an assembly process of a support structure for an assembly camshaft. 組立カムシャフトの支持構造がボルトを利用してシリンダヘッド上に取り付けられる工程を示す説明図Explanatory drawing showing a process in which a support structure of an assembly camshaft is mounted on a cylinder head using bolts. 他の実施形態に係る組立カムシャフトの支持構造の一部を表した平面図Top view showing a part of the support structure of the assembled camshaft according to another embodiment.

＜実施形態１＞
本発明の実施形態１を、図１〜図８を参照しつつ説明する。図１は、実施形態１に係る組立カムシャフトの支持構造１の一部を表した平面図である。組立カムシャフトの支持構造１（以下、単に「支持構造１」と称する場合がある）は、主として、１組の組立カムシャフト２，２と、複数の支持部材３と、複数の位置決め部４とを備えている。 <Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 is a plan view showing a part of the support structure 1 of the assembled camshaft according to the first embodiment. The support structure 1 of the assembled camshaft (hereinafter, may be simply referred to as “support structure 1”) mainly includes a set of assembled camshafts 2 and 2, a plurality of support members 3, and a plurality of positioning portions 4. It has.

本明細書において、図１の上側に示される一方の組立カムシャフト（吸気側の組立カムシャフト）２を、「組立カムシャフト２Ａ」と表し、図１の下側に示される他方の組立カムシャフト（排気側の組立カムシャフト）２を、「組立カムシャフト２Ｂ」と表す場合がある。 In the present specification, one assembled camshaft (assembled camshaft on the intake side) 2 shown on the upper side of FIG. 1 is referred to as "assembled camshaft 2A", and the other assembled camshaft shown on the lower side of FIG. (Assembled camshaft on the exhaust side) 2 may be referred to as "assembled camshaft 2B".

組立カムシャフト２は、シャフト２１と、そのシャフト２１に対して複数ずつ外嵌される複数のカムピース（カムロブ）２２とを有する。本実施形態の支持構造１は、１組の組立カムシャフト２，２を有するため、１組のシャフト２１，２１と、各シャフト２１に対してそれぞれ複数ずつ外嵌される複数のカムピース（カムロブ）２２とを有する。本明細書において、図１の上側に示される組立カムシャフト２Ａのシャフト２１を、「シャフト２１Ａ」と表し、図１の下側に示される組立カムシャフト２Ｂのシャフト２１を、「シャフト２１Ｂ」と表す場合がある。 The assembled camshaft 2 has a shaft 21 and a plurality of campieces (camlobs) 22 that are fitted onto the shafts 21. Since the support structure 1 of the present embodiment has one set of assembled camshafts 2 and 2, a set of shafts 21 and 21 and a plurality of campieces (camlobs) fitted to each of the shafts 21. It has 22 and. In the present specification, the shaft 21 of the assembled camshaft 2A shown on the upper side of FIG. 1 is referred to as "shaft 21A", and the shaft 21 of the assembled camshaft 2B shown on the lower side of FIG. 1 is referred to as "shaft 21B". May be represented.

シャフト２１は、金属材料が加工されたものからなり、全体的には丸棒状をなしている。支持部材３で支持される１組のシャフト２１，２１は、互いに平行に並ぶ形で配されている。また、図１に示されるように、各シャフト２１の軸線Ｌ方向（軸方向）に沿って、複数のカムピース２２が複数ずつ並ぶように取り付けられている。なお、本明細書において、シャフト２１Ａの軸線Ｌを「軸線Ｌ１」と表し、シャフト２１Ｂの軸線Ｌを「軸線Ｌ２」と表す場合がある。なお、シャフト２１のうち、支持部材３の軸受３２により支持される部分を、「ジャーナル部」と称する場合がある。 The shaft 21 is made of a processed metal material and has a round bar shape as a whole. A set of shafts 21 and 21 supported by the support member 3 are arranged so as to be arranged in parallel with each other. Further, as shown in FIG. 1, a plurality of cam pieces 22 are attached so as to be lined up along the axis L direction (axial direction) of each shaft 21. In the present specification, the axis L of the shaft 21A may be referred to as "axis L1", and the axis L of the shaft 21B may be referred to as "axis L2". The portion of the shaft 21 supported by the bearing 32 of the support member 3 may be referred to as a “journal portion”.

図２は、カムピース２２の斜視図である。カムピース２２は、全体的には略卵形をなし、シャフト２１が挿通される挿通孔２２ａを備えている。挿通孔２２ａの内径は、シャフト２１の外径と略同じに設定されている。カムピース２２は、挿通孔２２ａと同心の円弧形をなすカムベース部２２ｂと、挿通孔２２ａの中心から外周面までの距離がカムベース部２２ｂよりも大きいカムノーズ部２２ｃとを有する。カムピース２２は、金属材料が所定形状に加工されたものからなり、挿通孔２２ａにシャフト２１を挿通させ、所謂、焼き嵌めによって固定される。 FIG. 2 is a perspective view of the cam piece 22. The cam piece 22 has a substantially oval shape as a whole and includes an insertion hole 22a into which the shaft 21 is inserted. The inner diameter of the insertion hole 22a is set to be substantially the same as the outer diameter of the shaft 21. The cam piece 22 has an arc-shaped cam base portion 22b concentric with the insertion hole 22a, and a cam nose portion 22c in which the distance from the center of the insertion hole 22a to the outer peripheral surface is larger than that of the cam base portion 22b. The cam piece 22 is made of a metal material processed into a predetermined shape, and the shaft 21 is inserted into the insertion hole 22a and fixed by so-called shrink fitting.

図３は、支持部材３の斜視図である。支持部材３は、１組の組立カムシャフト２を支持する機能を有すると共に、最終的に、支持構造１を内燃機関のシリンダヘッドへ固定するための機能を備えている。支持構造１は、互いに独立した複数の支持部材３を備えている。複数の支持部材３は、軸線Ｌ方向に沿って、互いに間隔を保ちつつ一列に並んだ状態で、１組の組立カムシャフト２に取り付けられている。支持部材３は、全体的には偏平な直方体状の外観をなした本体部３１と、１組（２本）のシャフト２１，２１をそれぞれ挿通させた形で支持する１組の軸受３２，３２とを備えている。軸受３２は、シャフト２１が挿通される孔部３２ａと、孔部３２ａの内周面３２ｂとを含んでいる。支持部材３は、アルミニウム合金等の金属材料が加工されたものからなり、単一部品（一体型）から構成される。また、複数の支持部材３は、互いに接続されておらず、互いに独立している。 FIG. 3 is a perspective view of the support member 3. The support member 3 has a function of supporting a set of assembled camshafts 2 and finally has a function of fixing the support structure 1 to the cylinder head of the internal combustion engine. The support structure 1 includes a plurality of support members 3 that are independent of each other. The plurality of support members 3 are attached to a set of assembly camshafts 2 in a state of being arranged in a row along the axis L direction while maintaining a distance from each other. The support member 3 is a set of bearings 32, 32 that support the main body 31 having a flat rectangular parallelepiped appearance as a whole and a set (two) of shafts 21 and 21 inserted therein. And have. The bearing 32 includes a hole portion 32a through which the shaft 21 is inserted and an inner peripheral surface 32b of the hole portion 32a. The support member 3 is made of a processed metal material such as an aluminum alloy, and is composed of a single part (integral type). Further, the plurality of support members 3 are not connected to each other and are independent of each other.

本体部３１は、図１に示されるように、互いに平行に並ぶ２本のシャフト２１（組立カムシャフト２）を、まとめて支持する構成となっている。本体部３１には、軸線Ｌ方向に対して、垂直な方向に並ぶように、２つの軸受３２が設けられている。また、本体部３１には、上下方向に貫通するボルト挿通孔３１ａが設けられている。本実施形態の場合、ボルト挿通孔３１ａは、３つ設けられている。軸線Ｌ方向に対して垂直な方向において、本体部３１の中央にボルト挿通孔３１ａが１つ設けられ、かつ本体部３１の両端にそれぞれボルト挿通孔３１ａが１つずつ設けられている。 As shown in FIG. 1, the main body 31 has a configuration in which two shafts 21 (assembled camshafts 2) arranged in parallel with each other are collectively supported. The main body 31 is provided with two bearings 32 so as to be arranged in a direction perpendicular to the axis L direction. Further, the main body 31 is provided with a bolt insertion hole 31a penetrating in the vertical direction. In the case of this embodiment, three bolt insertion holes 31a are provided. In the direction perpendicular to the axis L direction, one bolt insertion hole 31a is provided in the center of the main body 31, and one bolt insertion hole 31a is provided at both ends of the main body 31.

軸受３２は、所謂、ジャーナル軸受であり、孔部３２ａにシャフト２１（ジャーナル部）が挿通された状態で、シャフト２１（ジャーナル部）を回転可能な状態で支持する。孔部３２ａの内周面３２ｂは、全周に亘って継ぎ目なく連続している。 The bearing 32 is a so-called journal bearing, and supports the shaft 21 (journal portion) in a rotatable state with the shaft 21 (journal portion) inserted through the hole portion 32a. The inner peripheral surface 32b of the hole portion 32a is seamlessly continuous over the entire circumference.

図４は、位置決め部４の斜視図である。位置決め部４は、軸受３２にシャフト２１が挿通されている状態の支持部材３を、シャフト２１の軸方向（軸線Ｌ方向）で位置決めするための部材である。位置決め部４は、全体的には円環状をなし、シャフト２１が挿通される孔部４ａを含む。孔部４ａの内径は、シャフト２１の外径と略同じに設定されている。位置決め部４は、孔部４ａにシャフト２１を挿通させ、焼き嵌めによって固定される。シャフト２１は、位置決め部４の孔部４ａによって、外側から締め付けられる形となる。 FIG. 4 is a perspective view of the positioning unit 4. The positioning portion 4 is a member for positioning the support member 3 in which the shaft 21 is inserted through the bearing 32 in the axial direction (axis L direction) of the shaft 21. The positioning portion 4 has an annular shape as a whole, and includes a hole portion 4a through which the shaft 21 is inserted. The inner diameter of the hole 4a is set to be substantially the same as the outer diameter of the shaft 21. The positioning portion 4 is fixed by inserting the shaft 21 through the hole portion 4a and shrink fitting. The shaft 21 is tightened from the outside by the hole 4a of the positioning portion 4.

支持構造１は、複数の位置決め部４を備えている。図１に示されるように、１つの支持部材３に対して、各シャフト２１の軸方向における位置決めをするために、４つの位置決め部４が使用されている。例えば、図１の左側に示される１つの支持部材３に対して、一方のシャフト２１Ａ上に、２つの位置決め部４，４が割り当てられ、かつ他方のシャフト２１Ｂ上に、２つの位置決め部４，４が割り当てられている。 The support structure 1 includes a plurality of positioning portions 4. As shown in FIG. 1, four positioning portions 4 are used to position one support member 3 in the axial direction of each shaft 21. For example, for one support member 3 shown on the left side of FIG. 1, two positioning portions 4 and 4 are assigned on one shaft 21A, and two positioning portions 4 and 4 are assigned on the other shaft 21B. 4 is assigned.

一方のシャフト２１Ａ上において、図１の左側に示される支持部材３を位置決めするために、１組の位置決め部４，４が、支持部材３を間に置く形で、軸線Ｌ１方向に沿って１列に並びつつ、シャフト２１Ａに固定されている。これらの位置決め部４，４は、シャフト２１Ａ上において、支持部材３を挟むように、支持部材３の両隣に割り当てられている。また、他方のシャフト２１Ｂ上において、図１の左側に示される支持部材３を位置決めするために、１組の位置決め部４，４が、支持部材３を間に置く形で、軸線Ｌ２方向に沿って１列に並びつつ、シャフト２１Ｂに固定されている。これらの位置決め部４，４は、シャフト２１Ｂ上において、支持部材３を挟むように、支持部材３の両隣に割り当てられている。 In order to position the support member 3 shown on the left side of FIG. 1 on one shaft 21A, a set of positioning portions 4 and 4 arranges the support member 3 in between, and 1 along the axis L1 direction. They are fixed to the shaft 21A while lining up in a row. These positioning portions 4 and 4 are assigned to both sides of the support member 3 on the shaft 21A so as to sandwich the support member 3. Further, in order to position the support member 3 shown on the left side of FIG. 1 on the other shaft 21B, a set of positioning portions 4 and 4 are arranged along the axis L2 direction with the support member 3 placed between them. They are fixed to the shaft 21B while lining up in a row. These positioning portions 4 and 4 are assigned to both sides of the support member 3 so as to sandwich the support member 3 on the shaft 21B.

つまり、支持部材３の一方の側面側（図１の左側）に、２つの位置決め部４が配され、また、支持部材３の他方の側面側（図１の右側）にも、２つの位置決め部４が配されている。 That is, two positioning portions 4 are arranged on one side surface side (left side in FIG. 1) of the support member 3, and two positioning portions are also arranged on the other side surface side (right side in FIG. 1) of the support member 3. 4 is arranged.

なお、位置決め部４は、支持部材３に対して密着させる必要はない。各シャフト２１上における支持部材３の移動が、軸方向においてある程度、制限されるものであれば、支持部材３と位置決め部４との間に、隙間が形成されてもよい。このように支持部材３と位置決め部４との間に、隙間が形成されることで、支持構造１をシリンダヘッドの所定箇所へ組み付ける際に、寸法誤差等が許容される。 The positioning portion 4 does not need to be in close contact with the support member 3. A gap may be formed between the support member 3 and the positioning portion 4 as long as the movement of the support member 3 on each shaft 21 is restricted to some extent in the axial direction. By forming a gap between the support member 3 and the positioning portion 4 in this way, a dimensional error or the like is allowed when the support structure 1 is assembled to a predetermined position of the cylinder head.

次いで、図５〜図８等を参照しつつ、支持構造１の組立方法（製造方法）を説明する。図５に示されるように、支持構造１の組立方法では、先ず、１組のシャフト２１，２１に対して、それぞれ１つずつ位置決め部４が、焼き嵌めにより、取り付けられる。具体的には、一方のシャフト２１Ａに取り付けられる位置決め部４と、他方のシャフト２１Ｂに取り付けられる位置決め部４とが、それぞれ、発熱手段を備えた冶具に保持された状態で、図５に示されるように、軸線Ｌ方向と垂直な方向に沿って並べられる。そして、各冶具に保持された各位置決め部４を加熱して、孔部４ａの内径を大きくし、そのような状態の各位置決め部４の各孔部４ａに対して、常温の各シャフト２１が挿通される。その際、各位置決め部４は、各シャフト２１の所定箇所に配置される。シャフト２１の挿通後、位置決め部４は常温に戻される。位置決め部４は常温に戻される過程で、孔部４ａの内径が小さくなり、孔部４ａの内周面が、シャフト２１の外周面に対して強固に密着することで、位置決め部４がシャフト２１の所定箇所に固定される。各シャフト２１上における各位置決め部４の取り付け位置は、各位置決め部４によって位置決めされる支持部材３の取り付け位置に応じて、適宜、設定される。 Next, an assembly method (manufacturing method) of the support structure 1 will be described with reference to FIGS. 5 to 8 and the like. As shown in FIG. 5, in the method of assembling the support structure 1, first, one positioning portion 4 is attached to each of the sets of shafts 21 and 21 by shrink fitting. Specifically, FIG. 5 shows a positioning portion 4 attached to one shaft 21A and a positioning portion 4 attached to the other shaft 21B, respectively, held by a jig provided with heat generating means. As described above, they are arranged along the direction perpendicular to the axis L direction. Then, each positioning portion 4 held by each jig is heated to increase the inner diameter of the hole portion 4a, and each shaft 21 at room temperature is attached to each hole portion 4a of each positioning portion 4 in such a state. It is inserted. At that time, each positioning unit 4 is arranged at a predetermined position on each shaft 21. After inserting the shaft 21, the positioning portion 4 is returned to room temperature. In the process of returning the positioning portion 4 to room temperature, the inner diameter of the hole portion 4a becomes smaller, and the inner peripheral surface of the hole portion 4a firmly adheres to the outer peripheral surface of the shaft 21, so that the positioning portion 4 becomes the shaft 21. It is fixed in place of. The mounting position of each positioning portion 4 on each shaft 21 is appropriately set according to the mounting position of the support member 3 positioned by each positioning portion 4.

続いて、図６に示されるように、位置決め部４が取り付けられた１組（２本）のシャフト２１を、支持部材３の１組の軸受３２に挿通させることで、１組のシャフト２１，２１に対して、支持部材３が取り付けられる。そして更に、そのような状態の１組のシャフト２１に対して、それぞれ１つずつ位置決め部４が、焼き嵌めにより、取り付けられる。このようにして、支持部材３は、一方のシャフト２１Ａ上において、１組の位置決め部４，４の間に配置され、かつ他方のシャフト２１Ｂ上において、１組の位置決め部４，４の間に配置された形となり、各シャフト２１の軸方向（軸線Ｌ方向）で位置決めされる。 Subsequently, as shown in FIG. 6, a set (two) of shafts 21 to which the positioning portion 4 is attached is inserted through a set of bearings 32 of the support member 3, so that the set of shafts 21, A support member 3 is attached to 21. Further, one positioning portion 4 is attached to each of the set of shafts 21 in such a state by shrink fitting. In this way, the support member 3 is arranged between the set of positioning portions 4 and 4 on one shaft 21A, and between the set of positioning portions 4 and 4 on the other shaft 21B. It becomes an arranged shape and is positioned in the axial direction (axis L direction) of each shaft 21.

その後、図７に示されるように、各シャフト２１の所定箇所に、カムピース２２が、焼き嵌めにより、取り付けられる。具体的には、一方のシャフト２１Ａに取り付けられる２つのカムピース２２と、他方のシャフト２１Ｂに取り付けられる２つのカムピース２２とが、それぞれ、発熱手段を備えた冶具に保持された状態で、軸線Ｌ方向に沿って並べられる。なお、各カムピース２２は、それぞれカムノーズ部２２ｃが所定の向きとなるように、各冶具によって保持されている。そして、各冶具に保持された各カムピース２２を加熱して、挿通孔２２ａの内径を大きくし、そのような状態の各カムピース２２の各挿通孔２２ａに対して、常温の各シャフト２１が挿通される。その際、各カムピース２２は、各シャフト２１の所定箇所に配置される。シャフト２１の挿通後、各カムピース２２は、常温に戻される。カムピース２２は常温に戻される過程で、挿通孔２２ａの内径が小さくなり、挿通孔２２ａの内周面が、シャフト２１の外周面に対して強固に密着することで、カムピース２２がシャフト２１の所定箇所に固定される。 After that, as shown in FIG. 7, the cam piece 22 is attached to a predetermined position of each shaft 21 by shrink fitting. Specifically, the two cam pieces 22 attached to one shaft 21A and the two cam pieces 22 attached to the other shaft 21B are held by a jig provided with heat generating means, respectively, in the L direction of the axis. Lined up along. Each cam piece 22 is held by each jig so that the cam nose portion 22c is oriented in a predetermined direction. Then, each cam piece 22 held by each jig is heated to increase the inner diameter of the insertion hole 22a, and each shaft 21 at room temperature is inserted into each insertion hole 22a of each cam piece 22 in such a state. To. At that time, each cam piece 22 is arranged at a predetermined position on each shaft 21. After inserting the shaft 21, each cam piece 22 is returned to room temperature. In the process of returning the cam piece 22 to room temperature, the inner diameter of the insertion hole 22a becomes smaller, and the inner peripheral surface of the insertion hole 22a firmly adheres to the outer peripheral surface of the shaft 21, so that the cam piece 22 becomes a predetermined position of the shaft 21. It is fixed in place.

このように各カムピース２２が各シャフト２１に取り付けられた後、図８に示されるように、１組のシャフト２１，２１に対して、それぞれ１つずつ位置決め部４が、焼き嵌めにより、取り付けられる。その後、２つ目の支持部材３が、上述した１つ目の支持部材３と同様の方法で、１組のシャフト２１，２１に対して、支持部材３が取り付けられる。そして更に、１組のシャフト２１，２１に対して、図１に示されるように、それぞれ位置決め部４が取り付けられる。 After each cam piece 22 is attached to each shaft 21 in this way, as shown in FIG. 8, one positioning portion 4 is attached to each of the sets of shafts 21 and 21 by shrink fitting. .. After that, the second support member 3 is attached to the set of shafts 21 and 21 in the same manner as the first support member 3 described above. Further, as shown in FIG. 1, positioning portions 4 are attached to one set of shafts 21 and 21 respectively.

以上のように、本実施形態の支持構造１は、１組のシャフト２１，２１に対して、一方の端側から他方の端側に向かって順に、位置決め部４、支持部材３、位置決め部４、カムピース２２等の各部材が取り付けられることで製造される。このような支持構造１は、組立カムシャフト２と、支持部材３との組み付けが容易である。しかも、組立カムシャフト２（シャフト２１）の軸方向において、各支持部材３が位置決め部４によって挟まれることにより位置決めされるため、支持構造１を搬送し易く、また、最終的にシリンダヘッドに対して取り付け易い構成となっている。 As described above, in the support structure 1 of the present embodiment, the positioning portion 4, the support member 3, and the positioning portion 4 are sequentially arranged from one end side to the other end side with respect to one set of shafts 21 and 21. , The cam piece 22 and the like are attached to each member. In such a support structure 1, the assembly camshaft 2 and the support member 3 can be easily assembled. Moreover, since each support member 3 is positioned by being sandwiched by the positioning portion 4 in the axial direction of the assembled camshaft 2 (shaft 21), the support structure 1 can be easily conveyed, and finally with respect to the cylinder head. It is easy to install.

また、本実施形態の支持構造１では、複数の支持部材３が互いに独立しており、それらが互いに接続されていない。そのため、シャフト２１の周りに、位置決め部４やカムピース２２を保持させる冶具を配置するスペースを確保し易い。 Further, in the support structure 1 of the present embodiment, the plurality of support members 3 are independent of each other and are not connected to each other. Therefore, it is easy to secure a space around the shaft 21 for arranging the positioning portion 4 and the jig for holding the cam piece 22.

なお、各図では省略されているが、シャフト２１（組立カムシャフト２）の端部には、クランクシャフトの回転動力を伝達するためのタイミングベルトが架けられるスプロケット等が取り付けられている。 Although omitted in each drawing, a sprocket or the like on which a timing belt for transmitting the rotational power of the crankshaft is hung is attached to the end of the shaft 21 (assembled camshaft 2).

本実施形態の支持構造１は、最終的に、シリンダヘッドに対して、ボルト締めにより固定される。図９は、組立カムシャフトの支持構造１がボルト１００を利用してシリンダヘッド２００上に取り付けられる工程を示す説明図である。支持構造１がシリンダヘッド２００に対して取り付けられる際、具体的には、支持部材３に設けられたボルト挿通孔３１ａにボルト１００が挿通され、かつボルト挿通孔３１ａからはみ出したボルト１００の先端部１００ａが、シリンダヘッド２００に設けられた雌ネジ孔２０１にねじ込まれることで、支持構造１がシリンダヘッド２００上に取り付けられる。 The support structure 1 of the present embodiment is finally fixed to the cylinder head by bolting. FIG. 9 is an explanatory view showing a process in which the support structure 1 of the assembled camshaft is mounted on the cylinder head 200 by using the bolt 100. When the support structure 1 is attached to the cylinder head 200, specifically, the bolt 100 is inserted into the bolt insertion hole 31a provided in the support member 3, and the tip of the bolt 100 protruding from the bolt insertion hole 31a. The support structure 1 is mounted on the cylinder head 200 by screwing the 100a into the female screw hole 201 provided in the cylinder head 200.

なお、ボルト挿通孔３１ａの孔径Ｒ１（図１の軸線Ｌ方向の大きさ）は、以下に示される事項を考慮して設定されてもよい。ここで、シリンダヘッドに設けられた雌ネジ孔の軸線Ｌ方向における位置の誤差（精度ばらつき）を、「Ｘａ」と表す。また、支持部材３のボルト挿通孔３１ａの軸線Ｌ方向における位置の誤差（精度ばらつき）を、「Ｘｂ」と表す。また、軸線Ｌ方向における支持部材３と、その支持部材３を挟む各位置決め部４との間の隙間（クリアランス）を、「Ｘｃ」と表す。そして、軸線Ｌ方向におけるボルトの直径Ｒ２と、ボルト挿通孔３１ａとの間の隙間（クリアランス）を、「Ｘｄ」と表す。支持構造１のシリンダヘッドに対する組み付け易さを考慮すると、「Ｘｄ＞Ｘａ＋Ｘｂ＋Ｘｃ」という関係を満たすことが好ましい。 The hole diameter R1 (the size in the axis L direction of FIG. 1) of the bolt insertion hole 31a may be set in consideration of the following items. Here, the error (precision variation) of the position of the female screw hole provided in the cylinder head in the axis L direction is expressed as "Xa". Further, the error (accuracy variation) of the position of the bolt insertion hole 31a of the support member 3 in the axis L direction is represented by “Xb”. Further, the gap (clearance) between the support member 3 in the axis L direction and each positioning portion 4 sandwiching the support member 3 is represented by "Xc". The gap (clearance) between the bolt diameter R2 and the bolt insertion hole 31a in the L direction of the axis is represented by "Xd". Considering the ease of assembling the support structure 1 to the cylinder head, it is preferable to satisfy the relationship "Xd> Xa + Xb + Xc".

＜他の実施形態＞
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。 <Other embodiments>
The present invention is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

（１）上記実施形態において、位置決め部４は、円環状をなしていたが、本発明はこれに限られず、シャフトが挿通される孔部を有し、かつ支持部材を位置決めできるものであれば、特に形状に制限はない。 (1) In the above embodiment, the positioning portion 4 has an annular shape, but the present invention is not limited to this, as long as it has a hole through which the shaft is inserted and the support member can be positioned. , There is no particular limitation on the shape.

（２）上記実施形態において、位置決め部４と、カムピース２２とは、互いに独立した別部材により構成されていたが、本発明はこれに限られず、他の実施形態においては、例えば、図１０に示されるように、同一のシャフト２（２Ａ，２Ｂ）に取り付けられるカムピース２２Ｘと、それの隣にある位置決め部４Ｘとが互いに接続し、かつ一体の部材（一体部材５Ｘ）として構成されてもよい。このようにカムピース２２Ｘと位置決め部４Ｘとを一体的に構成することにより、部品点数が削減され、シャフト２（２Ａ，２Ｂ）に対するカムピース２２Ｘ等の取り付け作業が容易となる。なお、図１０は、他の実施形態に係る組立カムシャフトの支持構造１Ｘの一部を表した平面図である。図１０において、実施形態１と同様の構成については、実施形態１と同じ符号を付し、それらの詳細説明は省略した。 (2) In the above embodiment, the positioning unit 4 and the cam piece 22 are composed of separate members independent of each other, but the present invention is not limited to this, and in other embodiments, for example, FIG. As shown, the cam piece 22X attached to the same shaft 2 (2A, 2B) and the positioning portion 4X next to the cam piece 22X may be connected to each other and configured as an integral member (integrated member 5X). .. By integrally configuring the cam piece 22X and the positioning portion 4X in this way, the number of parts is reduced, and the work of attaching the cam piece 22X or the like to the shaft 2 (2A, 2B) becomes easy. Note that FIG. 10 is a plan view showing a part of the support structure 1X of the assembled camshaft according to another embodiment. In FIG. 10, the same configurations as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.

（３）上記実施形態において、各位置決め部４は、シャフト２１上における支持部材３の位置決めに利用されているが、他の実施形態においては、支持部材３を軸方向で挟む１組以上の位置決め部４，４の取り付け位置の精度を上げる等して、それらの位置決め部４を、シリンダヘッド上における組立カムシャフト２の軸方向（軸線Ｌ方向）の位置決め（所謂、カムスラスト）のために利用してもよい。 (3) In the above embodiment, each positioning unit 4 is used for positioning the support member 3 on the shaft 21, but in other embodiments, one or more sets of positioning that sandwich the support member 3 in the axial direction. By improving the accuracy of the mounting positions of the parts 4 and 4, those positioning parts 4 are used for positioning (so-called cam thrust) in the axial direction (axis L direction) of the assembled camshaft 2 on the cylinder head. You may.

ボルト締めにより固定される
１…組立カムシャフトの支持構造、２…組立カムシャフト、２１…シャフト、２２…カムピース、３…支持部材、３１…本体部、３２…軸受、４…位置決め部、４ａ…孔部 Fixed by bolting 1 ... Assembly camshaft support structure, 2 ... Assembly camshaft, 21 ... Shaft, 22 ... Campiece, 3 ... Support member, 31 ... Main body, 32 ... Bearing, 4 ... Positioning part, 4a ... Hole

Claims (4)

互いに平行に配される１組のシャフトと、各シャフトに対してそれぞれ複数ずつ外嵌される複数のカムピースとを有する１組の組立カムシャフトと、
各々が、１組の前記シャフトをそれぞれ挿通させる１組の軸受を有し、かつ前記軸受が、全周に亘って継ぎ目なく連続している内周面を含む、互いに独立した複数の支持部材と、
各々が、前記シャフトを挿通させかつ前記シャフトを外側から締め付ける孔部を含み、前記軸受に前記シャフトが挿通されている状態の複数の前記支持部材が、前記シャフトの軸方向でそれぞれ位置決めされるように、各支持部材の両隣に割り当てられる複数の位置決め部とを備える組立カムシャフトの支持構造。 A set of assembled camshafts having a set of shafts arranged parallel to each other and a plurality of campieces fitted to each shaft.
Each has a set of bearings through which the shafts are inserted, and the bearings have a plurality of independent support members including an inner peripheral surface that is seamlessly continuous over the entire circumference. ,
Each of the support members includes a hole through which the shaft is inserted and the shaft is fastened from the outside, and the support members having the shaft inserted through the bearing are positioned in the axial direction of the shaft. A support structure for an assembled camshaft that includes a plurality of positioning portions assigned to both sides of each support member. 前記支持部材は、ボルトが挿通されるボルト挿通孔を有し、
前記ボルトが前記ボルト挿通孔に挿通されつつ、前記ボルト挿通孔からはみ出した前記ボルトの先端部が、シリンダヘッドに設けられた雌ネジ孔にねじ込まれることで、前記シリンダヘッド上に取り付けられる請求項１に記載の組立カムシャフトの支持構造。 The support member has a bolt insertion hole through which a bolt is inserted.
The claim that the bolt is inserted onto the cylinder head while the bolt is inserted into the bolt insertion hole, and the tip of the bolt protruding from the bolt insertion hole is screwed into a female screw hole provided in the cylinder head. The support structure for the assembled camshaft according to 1. 前記シャフトの軸線方向における前記雌ネジ孔の位置の誤差Ｘａと、前記軸線方向における前記ボルト挿通孔の位置の誤差Ｘｂと、前記軸線方向における前記支持部材と前記支持部材の両隣の前記位置決め部との間の隙間Ｘｃと、前記軸線方向における前記ボルトの直径と前記ボルト挿通孔との間の隙間Ｘｄとの関係が、Ｘｄ＞Ｘａ＋Ｘｂ＋Ｘｃである請求項２に記載の組立カムシャフトの支持構造。 An error Xa in the position of the female screw hole in the axial direction of the shaft, an error Xb in the position of the bolt insertion hole in the axial direction, and the support member and the positioning portion on both sides of the support member in the axial direction. The support structure for an assembled camshaft according to claim 2, wherein the relationship between the gap Xc between the spaces and the gap Xd between the diameter of the bolt and the bolt insertion hole in the axial direction is Xd> Xa + Xb + Xc. 前記シャフトに外嵌された前記カムピースと、前記カムピースの隣にある前記位置決め部とは、互いに接続し、かつ一体の部材として構成される請求項１に記載の組立カムシャフトの支持構造。 The support structure for an assembled camshaft according to claim 1, wherein the campiece externally fitted to the shaft and the positioning portion adjacent to the campiece are connected to each other and configured as an integral member.
JP2019200595A 2019-03-18 2019-11-05 Support structure of assembly camshaft Pending JP2020153362A (en)

Priority Applications (2)

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US16/793,707 US20200300349A1 (en) 2019-03-18 2020-02-18 Camshaft assembly support structure
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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0874523A (en) * 1994-09-01 1996-03-19 Daihatsu Motor Co Ltd Bearing device of cam shaft in internal combustion engine
JP2005090345A (en) * 2003-09-17 2005-04-07 Toyota Motor Corp Support structure of cam shaft for internal combustion engine
WO2006088149A1 (en) * 2005-02-17 2006-08-24 Jtekt Corporation Camshaft device and method of assembling camshaft device
JP2007247875A (en) * 2006-03-20 2007-09-27 Jtekt Corp Split type roller bearing device
JP2008008157A (en) * 2006-06-27 2008-01-17 Otics Corp Cam shaft supporting structure
JP2008075653A (en) * 2006-09-20 2008-04-03 Muhr & Bender Kg Assembly type cam shaft, and method for manufacturing the same
JP2008157062A (en) * 2006-12-21 2008-07-10 Otics Corp Supporting structure for camshaft, method for mounting camshaft and method for manufacturing camshaft
WO2012032634A1 (en) * 2010-09-09 2012-03-15 トヨタ自動車株式会社 Camshaft
DE102014110674A1 (en) * 2014-07-29 2016-02-04 Thyssenkrupp Presta Teccenter Ag Method for adjusting an axial clearance between two components of a camshaft
JP2017534017A (en) * 2014-11-06 2017-11-16 ティッセンクルップ プレスタ テックセンター アクチエンゲゼルシャフト Camshaft module installation method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0874523A (en) * 1994-09-01 1996-03-19 Daihatsu Motor Co Ltd Bearing device of cam shaft in internal combustion engine
JP2005090345A (en) * 2003-09-17 2005-04-07 Toyota Motor Corp Support structure of cam shaft for internal combustion engine
WO2006088149A1 (en) * 2005-02-17 2006-08-24 Jtekt Corporation Camshaft device and method of assembling camshaft device
JP2007247875A (en) * 2006-03-20 2007-09-27 Jtekt Corp Split type roller bearing device
JP2008008157A (en) * 2006-06-27 2008-01-17 Otics Corp Cam shaft supporting structure
JP2008075653A (en) * 2006-09-20 2008-04-03 Muhr & Bender Kg Assembly type cam shaft, and method for manufacturing the same
JP2008157062A (en) * 2006-12-21 2008-07-10 Otics Corp Supporting structure for camshaft, method for mounting camshaft and method for manufacturing camshaft
WO2012032634A1 (en) * 2010-09-09 2012-03-15 トヨタ自動車株式会社 Camshaft
DE102014110674A1 (en) * 2014-07-29 2016-02-04 Thyssenkrupp Presta Teccenter Ag Method for adjusting an axial clearance between two components of a camshaft
JP2017534017A (en) * 2014-11-06 2017-11-16 ティッセンクルップ プレスタ テックセンター アクチエンゲゼルシャフト Camshaft module installation method

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