JP4565540B2 - Camshaft - Google Patents

Camshaft Download PDF

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JP4565540B2
JP4565540B2 JP2003300634A JP2003300634A JP4565540B2 JP 4565540 B2 JP4565540 B2 JP 4565540B2 JP 2003300634 A JP2003300634 A JP 2003300634A JP 2003300634 A JP2003300634 A JP 2003300634A JP 4565540 B2 JP4565540 B2 JP 4565540B2
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cam
camshaft
piece
center
pieces
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JP2005069383A (en
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拓也 松浦
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Musashi Seimitsu Industry Co Ltd
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Description

本発明は、自動車等の内燃機関に使用されるカムシャフトに関する。   The present invention relates to a camshaft used for an internal combustion engine such as an automobile.

従来から自動車等の内燃機関にはカムシャフトが使用されてきた。このようなカムシャフト１０１としては、図４に示される如く、軸線方向に延びるカム軸１０２と、カム軸１０２上に形成され、図２に示される如くベース円１１０とベース円１１０から突出するトップ１１１とよりなるカム形状のカム駒１０４、１０５，１０６，１０７と、円形のジャーナル駒１０３を有している構造が一般的である。図４に示されるカムシャフト１０１においては、カム軸１０２は軽量化をはかるため軸方向に延びる中空孔１０８を有する中空形状となっており、この中空孔１０８の中心Ｏ１０２はカム軸１０２の中心Ｏ１０１と同心に形成されている。また、カム駒１０４は同位相の一対のカム駒１０４が各カム駒１０４間にジャーナル駒１０３を配置した状態で第一カム駒１０４から第四カム駒１０７まで四対形成され、各一対はそれぞれ異なる位相で配置されている。   Conventionally, camshafts have been used in internal combustion engines such as automobiles. As shown in FIG. 4, such a camshaft 101 includes a camshaft 102 extending in the axial direction, a base circle 110 formed on the camshaft 102, and a top protruding from the base circle 110 as shown in FIG. A structure having cam-shaped cam pieces 104, 105, 106, and 107, and a circular journal piece 103 is generally used. In the camshaft 101 shown in FIG. 4, the camshaft 102 has a hollow shape having a hollow hole 108 extending in the axial direction in order to reduce the weight. The center O102 of the hollow hole 108 is the center O101 of the camshaft 102. It is formed concentrically. The cam pieces 104 are formed in four pairs from the first cam piece 104 to the fourth cam piece 107 with the pair of cam pieces 104 having the same phase and the journal piece 103 disposed between the cam pieces 104. They are arranged in different phases.

上記の如きカムシャフト１０１は、クランクシャフトの回転が伝達されたカムシャフト１０１が回転することにより、カム駒１０４、１０５，１０６，１０７が吸入バルブ又は排気バルブを押圧して、適切な時期に開閉を行い、吸気と排気を行っている。この吸気及び排気の時期を調整するために複数のカム駒１０４、１０５，１０６，１０７は位相が異なった状態にカム軸１０２上に配置され、その配置の状態は内燃機関の構造により異なる。図４に示されるカムシャフト１０１の場合は、第二カム駒１０５乃至第四カム駒１０７である三対のカム駒が、カム軸１０２の周状に近似する位置にトップ１１１が集中する状態で配置されている。   The camshaft 101 as described above is opened and closed at an appropriate time by the camshafts 104, 105, 106, and 107 pressing the intake valve or the exhaust valve as the camshaft 101 to which the rotation of the crankshaft is transmitted rotates. The intake and exhaust are performed. In order to adjust the timing of intake and exhaust, the plurality of cam pieces 104, 105, 106, and 107 are arranged on the cam shaft 102 in different phases, and the arrangement state differs depending on the structure of the internal combustion engine. In the case of the camshaft 101 shown in FIG. 4, the top 111 is concentrated in a position where the three cam pieces, which are the second cam piece 105 to the fourth cam piece 107, approximate the circumferential shape of the cam shaft 102. Has been placed.

上記の如き構造のカムシャフト１０１においては、三対のカム駒１０５，１０６，１０７のトップ１１１が集中して形成されている側の重量が重くなり、一対の第一カム駒の形成されている側の重量が軽くなる。そのため重心がカム軸１０２の中心と異なり三対のカム駒１０５，１０６，１０７のトップ１１１が集中して形成されている重量の重い側に偏ってしまうので、カムシャフト１０１のバランスが悪くなり、カムシャフト１０１の回転に伴って振動が発生してしまうということがあった。また、カムシャフト１０１は図示せぬ軸受けによってジャーナル駒１０３が回転自在に保持されているが、重量の重い側に重量の軽い側と比べて重い荷重が付与された状態で回転することになるため、ジャーナル駒１０３が軸受けと当接する摩擦力が、カムシャフト１０１の重量の重い側が重量の軽い側と比較して大きくなってしまう。そのため、ジャーナル駒１０３におけるカムシャフト１０１の重量の重い側が重量の軽い側と比較して早く摩耗してしまうため、耐久性が損なわれ、品質が低下するということがあった。
特開平５−２６００７号公報 In the camshaft 101 having the above-described structure, the weight of the side where the tops 111 of the three pairs of cam pieces 105, 106, 107 are concentrated is increased, and the side where the pair of first cam pieces is formed. The weight of the lighter. Therefore, the center of gravity is different from the center of the camshaft 102, and the top 111 of the three pairs of cam pieces 105, 106, 107 is biased toward the heavier side formed so as to be concentrated. In some cases, vibration is generated as the camshaft 101 rotates. Further, the camshaft 101 is rotatably held by a journal piece 103 by a bearing (not shown). However, the camshaft 101 rotates in a state where a heavy load is applied to the heavy side compared to the light side. The frictional force with which the journal piece 103 comes into contact with the bearing is larger on the heavy side of the camshaft 101 than on the lighter side. For this reason, the heavy side of the camshaft 101 in the journal piece 103 is worn faster than the light side, so that the durability is impaired and the quality is deteriorated.
Japanese Patent Laid-Open No. 5-26007

解決しようとする問題点は、カム駒のトップがカム軸の周状に不均一に配置されて一方向に集中して形成されるカムシャフトにおいて、カム駒のトップが集中して形成される側の重量が重くなるので、カムシャフトの回転時に振動が発生したり、ジャーナル駒の一方側が他方側と比較して早く摩耗するので耐久性が損なわれて品質が低下する点である。   The problem to be solved is that in the camshaft in which the tops of the cam pieces are arranged unevenly around the camshaft and concentrated in one direction, the weight on the side where the tops of the cam pieces are concentrated Therefore, vibration is generated when the camshaft is rotated, and one side of the journal piece is worn faster than the other side, so that durability is lost and quality is lowered.

本発明は、軸線方向に延びる中空孔を有するカム軸と、カム軸上に形成され、ベース円とベース円から突出するトップとからなるカム形状の複数のカム駒を有し、複数のカム駒のトップがカム軸の周状に不均一に配置されるカムシャフトにおいて、カム軸は中空孔の中心が、カム軸の中心よりカム軸をその中心を基準にして軸直角方向に二区分した場合、複数のカム駒のトップが集中する一方の区分側に位置することを最も主要な特徴とする。 The present invention includes a camshaft having a hollow bore extending in the axial direction, are formed on the camshaft, having a plurality of cam piece of the cam shape composed of a top projecting from the base circle and base circle, a plurality of cam piece In the camshaft where the top is unevenly arranged around the camshaft, the center of the camshaft is divided into two in the direction perpendicular to the axis of the camshaft from the center of the camshaft. The most important feature is that the tops of a plurality of cam pieces are located on one side where they are concentrated .

本発明のカムシャフトは、複数のカム駒のトップはカム軸の周状に不均一に配置され、カム軸は中空孔の中心がカム軸の中心よりカム軸をその中心を基準にして軸直角方向に二区分した場合、複数のカム駒のトップが集中する一方の区分側に位置するため、カム駒のトップが集中する一方の区分側はトップ量の重量が増加するが、カム軸の重量は減少するので、バランス良くカムシャフトが回転することができ、振動が発生しない。また、カムシャフト回転時、ジャーナル駒が全周にわたって均一に軸受けに当接するので、ジャーナル駒の摩耗が全周にわたって均一になるので耐久性が向上し、品質の低下も抑制される。更に鋳造による製造時においては、従来と比較して中子の位置を変更するだけで製造できるため、製造が容易である。 In the camshaft of the present invention, the tops of the plurality of cam pieces are non-uniformly arranged around the camshaft, and the camshaft is perpendicular to the camshaft centered on the camshaft from the center of the camshaft. When the top is divided into two, the top of the plurality of cam pieces is located on the one side where the tops are concentrated, so that the weight of the top amount is increased on the one side where the tops of the cam pieces are concentrated, but the weight of the camshaft is reduced. Therefore, the camshaft can rotate in a well-balanced manner and no vibration is generated. Further, when the camshaft rotates, the journal piece abuts against the bearing uniformly over the entire circumference, so that the wear of the journal piece becomes uniform over the entire circumference, so that durability is improved and deterioration in quality is suppressed. Further, in the production by casting, the production is easy because the production can be performed only by changing the position of the core as compared with the conventional case.

カムシャフトをバランスよく回転させるという目的を、容易な製造方法で製造できる形状で実現した。   The purpose of rotating the camshaft in a balanced manner has been realized with a shape that can be manufactured with an easy manufacturing method.

図１乃至図３は、本発明の実施例によるカムシャフト１を表す。このカムシャフト１は、軸線方向に延びるカム軸２と、カム軸２上に設けられる複数のカム駒４及びジャーナル駒３から構成される。ジャーナル駒３は、その外周がカム軸２より大径で同心の円形状である。またカム駒４は、図２に示される如く、その外周がカム軸２より大径で同心の半円形状であるベース円１０と、そのベース円１０から突出するトップ１１とを有するカム形状である。図１の（ア）に示す如く、カム軸２上では同位相に配置された一対のカム駒が、位相の異なる状態で第一カム駒４から第四カム駒７まで、四対形成されており、各一対のカム駒４，５，６，７間にはジャーナル駒３が配置されている。そして図１の（イ）及び図３に示される如く、このカムシャフト１における第二カム駒５から第四カム駒７までの三対のカム駒５，６，７は、カム軸２の周状に近似する方向にトップ１１が形成された状態で配置されている。また、カム軸２には軸線方向に延びる中空孔８が形成されている。この中空孔８の中心Ｏ２はカム軸２の中心Ｏ１と異なり、カム軸２の中心Ｏ１よりカム軸２をその中心を基準にして軸直角方向に二区分した場合、第二カム駒５乃至第四カム駒７のトップ１１が形成される一方の区分側に位置し、カム軸２の肉厚は第二カム駒５乃至第四カム駒７のトップ１１が形成される一方の区分側が薄く、第一カム駒４のトップ１１が形成される他方の区分側が厚く形成されている。 1 to 3 show a camshaft 1 according to an embodiment of the present invention. The cam shaft 1 includes a cam shaft 2 extending in the axial direction, and a plurality of cam pieces 4 and journal pieces 3 provided on the cam shaft 2. The journal piece 3 has a concentric circular shape whose outer periphery is larger in diameter than the cam shaft 2. As shown in FIG. 2, the cam piece 4 has a cam shape having a base circle 10 whose outer periphery is larger in diameter than the cam shaft 2 and is concentric, and a top 11 protruding from the base circle 10. is there. As shown in FIG. 1A, four pairs of cam pieces arranged in the same phase on the camshaft 2 are formed from the first cam piece 4 to the fourth cam piece 7 in different phases. A journal piece 3 is disposed between each pair of cam pieces 4, 5, 6, and 7. As shown in FIGS. 1A and 3, three pairs of cam pieces 5, 6, 7 from the second cam piece 5 to the fourth cam piece 7 on the camshaft 1 are arranged around the cam shaft 2. The top 11 is arranged in a direction approximating the shape. The cam shaft 2 has a hollow hole 8 extending in the axial direction. The center O2 of the hollow hole 8 is different from the center O1 of the camshaft 2, and when the camshaft 2 is divided into two in the direction perpendicular to the axis from the center O1 of the camshaft 2, the second cam piece 5 to the second cam Located on one section side where the top 11 of the four cam pieces 7 is formed, the thickness of the cam shaft 2 is thin on one section side where the top 11 of the second cam piece 5 to the fourth cam piece 7 is formed, The other section side on which the top 11 of the first cam piece 4 is formed is formed thick.

上記カムシャフト１の製造方法を説明する。まず鋳造型に、中空孔８を成形する位置に中子を配置する。この中子は、カム軸成形部分とは中心が異なり、カム軸成形部分中心よりカム駒のトップが集中して形成される側に中心が位置する。続いて鋳造型内に形成されたキャビティ内に溶鋼を注入した後凝固させ、カムシャフト１を鋳造により製造する。 A method for manufacturing the camshaft 1 will be described. First, the core is placed in the casting mold at the position where the hollow hole 8 is formed. The center of the core is different from that of the camshaft molding portion, and the center is located on the side where the tops of the cam pieces are formed concentrated from the center of the camshaft molding portion. Subsequently, molten steel is poured into a cavity formed in the casting mold and then solidified, and the camshaft 1 is manufactured by casting.

上記の如く製造されたカムシャフト１は、図示せぬ軸受けにジャーナル駒３が回転自在に保持された状態で回転する。このときカム軸２の中空孔８はカム軸２の中心Ｏ１よりカム軸２をその中心を基準にして軸直角方向に二区分した場合、第二カム駒５乃至第四カム駒７のトップ１１が形成される一方の区分側に中心Ｏ２が位置しているので、第二カム駒５乃至第四カム駒７のトップ１１が集中する一方の区分側の重量が増加する。これに対し、カム軸２は、第二カム駒５乃至第四カム駒７のトップ１１が形成される一方の区分側の肉厚が薄く、第一カム駒４のトップ１１が形成される他方の区分側の肉厚が厚く形成されているため、カム軸２の重量が第二カム駒５乃至第四カム駒７のトップ１１が形成される側の方が軽量となり、カムシャフト１全体としてバランスがよくなる。 The camshaft 1 manufactured as described above rotates in a state where the journal piece 3 is rotatably held by a bearing (not shown). At this time, the hollow hole 8 of the cam shaft 2 is divided into two in the direction perpendicular to the axis of the cam shaft 2 with respect to the center O1 of the cam shaft 2, and the top 11 of the second cam piece 5 to the fourth cam piece 7 is. Since the center O2 is located on one section side where the top cam 11 is formed, the weight on one section side where the tops 11 of the second cam piece 5 to the fourth cam piece 7 are concentrated increases. On the other hand contrast, the cam shaft 2, the thickness of the segment side of one of the top 11 is formed of the second cam piece 5 to the fourth cam piece 7 is thin, the top 11 of the first cam piece 4 is formed since the thickness of the segment side is formed thickly, towards the side where the weight of the cam shaft 2 is top 11 of the second cam piece 5 to the fourth cam piece 7 is formed it is lightweight as a whole camshaft 1 Balance is improved.

本発明の実施例によるカムシャフトを表し、（ア）は平面図、（イ）はＡ−Ａ断面側面図である。1A and 1B show a camshaft according to an embodiment of the present invention, in which FIG. カムシャフトの形状を表す側面図である。It is a side view showing the shape of a cam shaft. 本発明の実施例によるカムシャフトの部分断面平面図である。1 is a partial cross-sectional plan view of a camshaft according to an embodiment of the present invention. 従来のカムシャフトを表し、（ア）は平面図、（イ）はａ−ａ断面側面図である。A conventional camshaft is represented, (A) is a plan view, and (A) is a side view taken along the line aa.

符号の説明Explanation of symbols

２ カム軸
４，５，６，７ カム駒
１０ べース円
１１ トップ
Ｏ１ （カム軸の）中心
Ｏ２ （中空孔の）中心 2 Cam shafts 4, 5, 6, 7 Cam piece 10 Base circle 11 Top O1 Center of cam shaft O2 Center of hollow hole

Claims (1)

軸線方向に延びる中空孔（８）を有するカム軸（２）と、該カム軸（２）上に形成され、ベース円（１０）と該ベース円（１０）から突出するトップ（１１）とからなるカム形状の複数のカム駒（４，５，６，７）を有し、該複数のカム駒（４，５，６，７）のトップ（１１）が前記カム軸（２）の周状に不均一に配置されるカムシャフトにおいて、前記カム軸（２）は中空孔（８）の中心（０２）が、前記カム軸（２）の中心（Ｏ１）より前記カム軸（２）をその中心を基準にして軸直角方向に二区分した場合、前記複数のカム駒（４，５，６，７）のトップ（１１）が集中する一方の区分側に位置することを特徴とするカムシャフト。 A cam shaft (2) having a hollow hole (8) extending in the axial direction, a base circle (10) formed on the cam shaft (2), and a top (11) protruding from the base circle (10) comprising a plurality of cam piece of the cam shape (4,5,6,7), the top (11) of the cam shaft of said plurality of cam piece (4, 5, 6, 7) circumferential (2) The cam shaft (2) has a center (02) of the hollow hole (8) that is connected to the cam shaft (2) from the center (O1) of the cam shaft (2). The camshaft is characterized in that when divided into two at right angles with respect to the center, the top (11) of the plurality of cam pieces (4, 5, 6, 7) is located on one divided side. .
JP2003300634A 2003-08-25 2003-08-25 Camshaft Expired - Fee Related JP4565540B2 (en)

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Publication number Priority date Publication date Assignee Title
DE102006027494A1 (en) * 2006-06-14 2007-12-20 Henkel Kgaa Shaft with fixed component
JP7561783B2 (en) 2022-01-20 2024-10-04 ダイハツ工業株式会社 Camshaft Structure

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61202771A (en) * 1985-03-05 1986-09-08 Nissan Motor Co Ltd Production of cam shaft
JPS61253159A (en) * 1985-04-30 1986-11-11 Honda Motor Co Ltd Tubular body for casting hollow shaft
JPS63235607A (en) * 1987-03-09 1988-09-30 ゼネラル・モータース・コーポレーション Camshaft and assembly method and assembly device thereof
JPH02501323A (en) * 1986-07-12 1990-05-10 エミテック・ゲゼルシャフト・フュア・エミッシオンス　テクノロジー・ミット・ベシュレンクテル・ハフツング Camshaft manufacturing method
JPH0538527A (en) * 1991-08-01 1993-02-19 Mazda Motor Corp Assembled cam shaft and manufacture of the same
JPH0536004U (en) * 1991-10-17 1993-05-18 三菱自動車工業株式会社 Engine camshaft
JP2002021975A (en) * 2000-07-05 2002-01-23 Riken Corp Hollow cam shaft
JP2002038908A (en) * 2000-07-27 2002-02-06 Riken Corp Cast iron hollow camshaft for engine
JP2002178051A (en) * 2000-12-20 2002-06-25 Sumitomo Metal Ind Ltd Manufacturing method for hollow shaft having projection

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61202771A (en) * 1985-03-05 1986-09-08 Nissan Motor Co Ltd Production of cam shaft
JPS61253159A (en) * 1985-04-30 1986-11-11 Honda Motor Co Ltd Tubular body for casting hollow shaft
JPH02501323A (en) * 1986-07-12 1990-05-10 エミテック・ゲゼルシャフト・フュア・エミッシオンス　テクノロジー・ミット・ベシュレンクテル・ハフツング Camshaft manufacturing method
JPS63235607A (en) * 1987-03-09 1988-09-30 ゼネラル・モータース・コーポレーション Camshaft and assembly method and assembly device thereof
JPH0538527A (en) * 1991-08-01 1993-02-19 Mazda Motor Corp Assembled cam shaft and manufacture of the same
JPH0536004U (en) * 1991-10-17 1993-05-18 三菱自動車工業株式会社 Engine camshaft
JP2002021975A (en) * 2000-07-05 2002-01-23 Riken Corp Hollow cam shaft
JP2002038908A (en) * 2000-07-27 2002-02-06 Riken Corp Cast iron hollow camshaft for engine
JP2002178051A (en) * 2000-12-20 2002-06-25 Sumitomo Metal Ind Ltd Manufacturing method for hollow shaft having projection

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