JP6111697B2 - Engine negative pressure supply device - Google Patents

Engine negative pressure supply device Download PDF

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JP6111697B2
JP6111697B2 JP2013015547A JP2013015547A JP6111697B2 JP 6111697 B2 JP6111697 B2 JP 6111697B2 JP 2013015547 A JP2013015547 A JP 2013015547A JP 2013015547 A JP2013015547 A JP 2013015547A JP 6111697 B2 JP6111697 B2 JP 6111697B2
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negative pressure
cylinder head
engine
vacuum pump
axis
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JP2014145342A (en
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裕之 金子
裕之 金子
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Suzuki Motor Co Ltd
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Suzuki Motor Co Ltd
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Priority to JP2013015547A priority Critical patent/JP6111697B2/en
Priority to CN201310684333.6A priority patent/CN103967642B/en
Priority to DE102014200616.3A priority patent/DE102014200616B4/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F02B37/186—Arrangements of actuators or linkage for bypass valves

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Description

本発明は、車両に用いられる負圧作動機器に負圧を供給する負圧供給装置に関し、特にエンジンのシリンダヘッドに取付けられたバキュームポンプによって負圧作動機器に負圧を供給するエンジンの負圧供給装置に好適なものである。   The present invention relates to a negative pressure supply device that supplies a negative pressure to a negative pressure operating device used in a vehicle, and in particular, to a negative pressure of an engine that supplies a negative pressure to a negative pressure operating device by a vacuum pump attached to a cylinder head of the engine. It is suitable for the supply device.

バキュームポンプは、回転駆動力によって負圧を発生させる機能を持ち、その負圧はブレーキの負圧倍力装置、ターボチャージャ制御用ＶＳＶ（Vacuum Switching Valve）などのエンジン負圧作動機器に利用される。このようなバキュームポンプによるエンジンの負圧供給装置としては、例えば下記特許文献１に記載されるものがある。このエンジンの負圧供給装置では、タイミングチェーンによってポンプ軸が駆動されるバキュームポンプをシリンダブロックに取付け、このバキュームポンプと負圧作動機器を接続する負圧形成通路部材をシリンダヘッドの上端部に沿わせて配管する。そして、負圧形成通路部材は、金属製パイプを湾曲させて形成される。   The vacuum pump has a function of generating a negative pressure by a rotational driving force, and the negative pressure is used in an engine negative pressure operating device such as a negative pressure booster for a brake or a VSV (Vacuum Switching Valve) for turbocharger control. . As an engine negative pressure supply device using such a vacuum pump, for example, there is one described in Patent Document 1 below. In this negative pressure supply device for an engine, a vacuum pump whose pump shaft is driven by a timing chain is attached to a cylinder block, and a negative pressure forming passage member for connecting the vacuum pump and the negative pressure operating device is provided along the upper end of the cylinder head. Pipe them together. The negative pressure forming passage member is formed by bending a metal pipe.

特開２００３−７４４１１号公報JP 2003-74411 A

ところで、このようなバキュームポンプの回転駆動源として、近年ではカム軸を使用するものも多い。即ち、バキュームポンプはカム軸に接続され、そのカム軸によって駆動される。このようなバキュームポンプはシリンダヘッドに取付けられることも多いが、前記特許文献１に記載されるエンジンの負圧供給装置では、負圧作動機器がシリンダヘッドの近傍に配置されているにも関わらず、それら負圧作動機器とバキュームポンプを金属製パイプからなる負圧形成通路部材で接続するため、配管構造が複雑で、例えば金属製パイプを固定する固定具などの部品点数も多い。   By the way, as a rotational drive source of such a vacuum pump, a camshaft is often used in recent years. That is, the vacuum pump is connected to and driven by the cam shaft. Such a vacuum pump is often attached to the cylinder head. However, in the engine negative pressure supply device described in Patent Document 1, the negative pressure operating device is disposed in the vicinity of the cylinder head. Since the negative pressure operating device and the vacuum pump are connected by a negative pressure forming passage member made of a metal pipe, the piping structure is complicated, and for example, there are many parts such as a fixture for fixing the metal pipe.

本発明は、上記のような問題点に着目してなされたものであり、配管構造の簡略化が可能で、シリンダヘッドの剛性を高めることもできるエンジンの負圧供給装置を提供することを目的とするものである。   The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a negative pressure supply device for an engine that can simplify the piping structure and increase the rigidity of the cylinder head. It is what.

上記課題を解決するために、発明の一態様は、エンジンのカム軸の軸方向端部でシリンダヘッドに取り付けられ、前記カム軸によって駆動されて負圧作動機器に負圧を供給するバキュームポンプと、前記負圧作動機器に負圧を送る配管が連結され、前記バキュームポンプからの負圧が前記配管へ取り出される負圧取出し口と、を備えたエンジンの負圧供給装置において、前記カム軸の軸線と同方向に延びて前記シリンダヘッドに設けられ、前記バキュームポンプのポンプ吸入口と連結する吸入口を備えた吸入フランジと、前記シリンダヘッドの壁内に形成され、前記吸入フランジの前記吸入口と前記負圧作動機器に接続される負圧取出し口とを連絡するシリンダヘッド内負圧通路と、を備え、前記シリンダヘッド内負圧通路は、前記カム軸の軸線と同方向に形成され前記吸入フランジの前記吸入口に連通する連通路と、前記連通路の軸線に対して軸線が直交し且つ軸線が直線状に形成された連結穴と、から形成され、前記連結穴は、一端が前記連通路の端部と連通し、他端が前記負圧取出し口が配置される配管連結部と連通し、前記連結穴の外壁をなす部分は前記シリンダヘッドの外壁から突出するリブ形状に形成されていることを特徴とするエンジンの負圧供給装置である。 In order to solve the above-described problems, an aspect of the invention is a vacuum pump that is attached to a cylinder head at an axial end portion of an engine camshaft and that is driven by the camshaft to supply negative pressure to a negative pressure operating device. the negative pressure motive device to send a negative pressure pipe is connected, the negative pressure supply apparatus for an engine negative pressure is and a negative pressure outlet port to be taken into the pipe from the vacuum pump, the camshaft A suction flange provided in the cylinder head extending in the same direction as an axis and connected to a pump suction port of the vacuum pump; and a suction flange formed in a wall of the cylinder head, the suction port of the suction flange said negative pressure passage in the cylinder head to contact the negative pressure outlet port which is connected to the negative pressure motive device comprises a negative pressure passage in the cylinder head, the camshaft A communication path that is formed in the same direction as the line and communicates with the suction port of the suction flange, and a connection hole in which the axis is orthogonal to the axis of the communication path and the axis is linear. The connecting hole has one end communicating with the end of the communication path, the other end communicating with a pipe connecting portion where the negative pressure outlet is disposed, and a portion forming the outer wall of the connecting hole is an outer wall of the cylinder head 1. A negative pressure supply device for an engine, characterized in that the negative pressure supply device is formed in a rib shape protruding from the engine.

また、前記連結穴は少なくとも２つ設けられ、これらの連結穴のうちの２つの連結穴の一方は連結穴の端部を起点としてエンジン前方向に延びるように配置されており、他方は連結穴の端部を起点としてエンジン後方向に延びるように配置され、前記一方の連結穴と他方の連結穴は一直線状に並び、エンジン前後方向の穴は共通の穴で構成される。 In addition, at least two of the connecting holes are provided, and one of the two connecting holes is arranged so as to extend in the front of the engine starting from the end of the connecting hole, and the other is the connecting hole. The one connection hole and the other connection hole are arranged in a straight line, and the engine front-rear direction hole is formed by a common hole .

また、前記連結穴は、前記配管連結部側よりも前記連通路側がエンジン上下方向で下方になるように軸線が設定されている   Further, the connecting hole has an axis set so that the communication path side is lower in the vertical direction of the engine than the pipe connecting portion side.

発明の一態様によれば、エンジンのシリンダヘッドにバキュームポンプが取付けられ、バキュームポンプのポンプ吸入口に接続される吸入口と負圧作動機器に接続される負圧取出し口とを連絡するシリンダヘッド内負圧通路がシリンダヘッドの壁内に形成され、シリンダヘッド内負圧通路に接続され且つ負圧取出し口を連結するための配管連結部がシリンダヘッドの壁部の外側に配置される。そのため、負圧取出し口から負圧作動機器までの配管構造を簡略化することができる。また、負圧取出し口から負圧作動機器までの配管構造がゴムホースである場合に、ゴムホースの配管区間を短縮することができ、バキュームポンプで発生した負圧が負圧作動機器へ伝わるまでの負圧伝達性能が向上する。また、シリンダヘッドの熱によってシリンダヘッド内負圧通路内における空気中の水分の凍結を防止することができる。   According to an aspect of the invention, a vacuum pump is attached to a cylinder head of an engine, and the cylinder head communicates between an intake port connected to a pump intake port of the vacuum pump and a negative pressure take-out port connected to a negative pressure operating device. An internal negative pressure passage is formed in the wall of the cylinder head, and a pipe connecting portion connected to the negative pressure passage in the cylinder head and for connecting the negative pressure outlet is disposed outside the wall portion of the cylinder head. Therefore, the piping structure from the negative pressure outlet to the negative pressure operating device can be simplified. In addition, when the piping structure from the negative pressure outlet to the negative pressure operating device is a rubber hose, the piping section of the rubber hose can be shortened, and the negative pressure generated by the vacuum pump is transferred to the negative pressure operating device. Pressure transmission performance is improved. Further, it is possible to prevent freezing of moisture in the air in the negative pressure passage in the cylinder head due to the heat of the cylinder head.

また、シリンダヘッド内負圧通路は、吸入口に連絡する連通路と、配管連結部に連絡し且つ連通路の軸線に軸線が直交し且つ軸線が直線状の連結穴とを備えて構成される。そのため、１つの連通路に軸線が直交する２つの連結穴を互いに逆向きに形成する場合には、連通路及び連結穴の外壁を構成するリブがシリンダヘッドの壁部外側に連続して形成され、シリンダヘッドの剛性を高めることが可能となる。また、これにより、カム軸に取付けられたギヤ音やタイミングチェーンの作動音などのエンジン内部の音を遮音する性能も向上する。また、３つ以上の負圧取出し口を設ける場合であっても、１つの連通路に３つ以上の連結穴を接続することで全ての負圧取出し口をシリンダヘッドに配置することができ、負圧取出し口のレイアウトが容易になる。   The negative pressure passage in the cylinder head is configured to include a communication passage that communicates with the suction port, and a connection hole that communicates with the pipe connection portion and whose axis is orthogonal to the axis of the communication passage and whose axis is linear. . For this reason, when two connecting holes whose axes are orthogonal to each other are formed in opposite directions, ribs constituting the outer walls of the communicating path and the connecting hole are continuously formed outside the wall portion of the cylinder head. It becomes possible to increase the rigidity of the cylinder head. This also improves the performance of isolating engine internal sounds such as gear noise attached to the camshaft and timing chain operating noise. Further, even when three or more negative pressure outlets are provided, all the negative pressure outlets can be arranged in the cylinder head by connecting three or more connecting holes to one communication path. The layout of the negative pressure outlet becomes easy.

また、配管連結部側よりも連通路側がエンジン上下方向で下方になるように連結穴の軸線を設定した。これにより、シリンダヘッド内負圧通路内の水分や油分などの液体をバキュームポンプ側に集めてバキュームポンプから排出することが可能となる。   In addition, the axis of the connection hole was set so that the communication path side was lower in the engine vertical direction than the pipe connection side. As a result, liquid such as moisture and oil in the negative pressure passage in the cylinder head can be collected on the vacuum pump side and discharged from the vacuum pump.

本発明のエンジンの負圧供給装置が適用されたシリンダヘッドの一実施形態を示す平面図である。It is a top view which shows one Embodiment of the cylinder head to which the negative pressure supply apparatus of the engine of this invention was applied. 図１のシリンダヘッドにおけるバキュームポンプの取付構造を示す正面図である。It is a front view which shows the attachment structure of the vacuum pump in the cylinder head of FIG. 図１のシリンダヘッドにおける負圧供給装置の斜視図である。It is a perspective view of the negative pressure supply apparatus in the cylinder head of FIG. 図１のシリンダヘッド内負圧通路を示す図２のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 2 which shows the negative pressure channel | path in a cylinder head of FIG.

次に、本発明のエンジンの負圧供給装置の一実施形態について図面を参照しながら説明する。図１は、本実施形態のシリンダヘッドの平面図、図２は、図１のシリンダヘッドにおけるバキュームポンプの取付構造を示す正面図、図３は、図１のシリンダヘッドにおける負圧供給装置の斜視図である。本実施形態のエンジンでは、図示しないシリンダブロックの上方にシリンダヘッド１が取付けられている。本実施形態のシリンダヘッド１は、シリンダブロックの上方に搭載されるシリンダヘッド下部１ａと、その上方に取付けられるカムハウジング２を備えて構成される。なお、エンジン本体は、種々の向きで車両に搭載されるが、凡そシリンダブロックに対してシリンダヘッド１が上方になるように搭載されるので、その方向をエンジン上方、逆方向をエンジン下方と定義する。   Next, an embodiment of an engine negative pressure supply device of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the cylinder head of the present embodiment, FIG. 2 is a front view showing a vacuum pump mounting structure in the cylinder head of FIG. 1, and FIG. 3 is a perspective view of a negative pressure supply device in the cylinder head of FIG. FIG. In the engine of this embodiment, the cylinder head 1 is attached above a cylinder block (not shown). The cylinder head 1 of the present embodiment includes a cylinder head lower portion 1a mounted above the cylinder block, and a cam housing 2 attached above the cylinder head lower portion 1a. Although the engine body is mounted on the vehicle in various directions, it is mounted so that the cylinder head 1 is approximately upward with respect to the cylinder block, so that the direction is defined as the engine upper direction and the opposite direction as the engine lower direction. To do.

本実施形態のエンジンは、シリンダヘッド１の近傍に、負圧倍力装置（マスタバッグ）５１やターボチャージャ制御用ＶＳＶ５２といった負圧作動機器を備える。このうち、負圧倍力装置５１は、マスタシリンダ５３に取付けられ、図示しないブレーキペダルへの踏力を倍力して大きな制動液圧を得るためのものである。また、ターボチャージャ制御用ＶＳＶ５２はターボチャージャ５４に接続され、ターボチャージャ５４の作動状態を制御するためのものである。この他にも、エンジンで得られる負圧を利用する負圧作動機器としては、例えば排気ガス還流装置（ＥＧＲ）の通路を開閉するためのＥＧＲ通路制御用ＶＳＶなどが挙げられる。   The engine of this embodiment includes negative pressure operating devices such as a negative pressure booster (master bag) 51 and a turbocharger control VSV 52 in the vicinity of the cylinder head 1. Among these, the negative pressure booster 51 is attached to the master cylinder 53, and is used for boosting the depression force on a brake pedal (not shown) to obtain a large brake fluid pressure. The turbocharger control VSV 52 is connected to the turbocharger 54 to control the operating state of the turbocharger 54. In addition to this, examples of the negative pressure operating device using the negative pressure obtained by the engine include an EGR passage control VSV for opening and closing a passage of an exhaust gas recirculation device (EGR).

はじめに、本実施形態で使用されるバキュームポンプ３について説明する。本実施形態のバキュームポンプ３は、ベーンなどのロータが収納される本体部４と、当該ロータが本体部４内で接続され且つ本体部４から外部に突出するポンプ軸５を備える。本体部４は、ロータなどが収納されるハウジング６と、ロータなどを収納したハウジング６を密閉する蓋体７を備えて構成され、蓋体７はボルトなどの締結具１１によってハウジング６に着脱可能に取付けられている。ハウジング６には、バキュームポンプ３のエンジン上部側をエンジンに固定するためのポンプ上部側ボス部８が１カ所、バキュームポンプ３のエンジン下部側をエンジンに固定するためのポンプ下部側ボス部９が２カ所設けられている。これらポンプ上部側ボス部８及びポンプ下部側ボス部９には、夫々、ボルト１０が挿入され、これらボルト１０によってバキュームポンプ３がシリンダヘッド１に固定される。また、ポンプ軸５は、本体部４のハウジング６から前記ボルト１０の突出方向と同方向に突出しており、その突出端部には二股鉤手状の係合爪１２が形成されている。なお、図中の符号２７は、バキュームポンプ３のハウジング６のポンプ軸５側面に設けられたポンプ吸入口である。   First, the vacuum pump 3 used in this embodiment will be described. The vacuum pump 3 of the present embodiment includes a main body portion 4 in which a rotor such as a vane is accommodated, and a pump shaft 5 to which the rotor is connected in the main body portion 4 and protrudes from the main body portion 4 to the outside. The main body 4 includes a housing 6 that accommodates a rotor and the like, and a lid 7 that seals the housing 6 that accommodates the rotor. The lid 7 can be attached to and detached from the housing 6 by a fastener 11 such as a bolt. Installed on. The housing 6 has a pump upper side boss portion 8 for fixing the engine upper side of the vacuum pump 3 to the engine, and a pump lower side boss portion 9 for fixing the engine lower side of the vacuum pump 3 to the engine. There are two places. Bolts 10 are respectively inserted into the pump upper boss portion 8 and the pump lower boss portion 9, and the vacuum pump 3 is fixed to the cylinder head 1 by these bolts 10. The pump shaft 5 projects from the housing 6 of the main body 4 in the same direction as the projecting direction of the bolt 10, and a bifurcated claws 12 are formed on the projecting end. Reference numeral 27 in the drawing denotes a pump inlet provided on the side of the pump shaft 5 of the housing 6 of the vacuum pump 3.

一方、本実施形態では、１つのシリンダヘッド１に二本のカム軸１３、１４が配置されている。このうち、例えば図３の図示左方のカム軸１３が排気カム軸、図示右方のカム軸１４が吸気カム軸である。これらのカム軸１３、１４は、エンジン上方からカムハウジング２を被せるようにシリンダヘッド下部１ａに取付けることで、シリンダヘッド１に対して回転自在に支持される。カムハウジング２をシリンダヘッド下部１ａに取付ける場合には、例えばラッシュアジャスタの反力に抗してカムハウジング２でカム軸１３、１４をシリンダヘッド下部１ａ側に押し付けるようにする。なお、カムハウジング２には、例えば図３に見えているカム軸１３、１４の軸線方向端部側に吸入フランジ１６が形成されており、この吸入フランジ１６の中央部に吸入口１５が形成されている。そして、この吸入口１５は、カムハウジング２、つまりシリンダヘッド１の壁部内で、ターボチャージャ制御用ＶＳＶ５２に接続する第１負圧取出し口１７及び負圧倍力装置５１に接続する第２負圧取出し口１８に連絡されている。このうち、第１負圧取出し口１７はゴムホース５５を介してターボチャージャ制御用ＶＳＶ５２に接続され、ターボチャージャ制御用ＶＳＶ５２はゴムホース５５を介してターボチャージャ５４に接続されている。また、第２負圧取出し口１８はゴムホース５５を介して負圧倍力装置５１に接続されている。   On the other hand, in this embodiment, two camshafts 13 and 14 are arranged in one cylinder head 1. Of these, for example, the left camshaft 13 shown in FIG. 3 is an exhaust camshaft, and the right camshaft 14 is an intake camshaft. These camshafts 13 and 14 are rotatably supported with respect to the cylinder head 1 by being attached to the cylinder head lower portion 1a so as to cover the cam housing 2 from above the engine. When the cam housing 2 is attached to the cylinder head lower portion 1a, for example, the cam shafts 13 and 14 are pressed against the cylinder head lower portion 1a side by the cam housing 2 against the reaction force of the lash adjuster. In the cam housing 2, for example, a suction flange 16 is formed on the axial end side of the cam shafts 13 and 14 that can be seen in FIG. 3, and a suction port 15 is formed in the center of the suction flange 16. ing. The suction port 15 is connected to the first negative pressure extraction port 17 connected to the turbocharger control VSV 52 and the second negative pressure connected to the negative pressure booster 51 in the cam housing 2, that is, the wall of the cylinder head 1. The outlet 18 is communicated. Among these, the first negative pressure outlet 17 is connected to the turbocharger control VSV 52 via the rubber hose 55, and the turbocharger control VSV 52 is connected to the turbocharger 54 via the rubber hose 55. Further, the second negative pressure outlet 18 is connected to the negative pressure booster 51 through a rubber hose 55.

本実施形態では、二本のカム軸１３、１４の一方の軸方向端部、つまり例えば図３に見えている側の軸方向端部にギヤ１９が取付けられている。これらのギヤ１９は、互いに噛み合い、且つ歯数が同じである。従って、二本のカム軸１３、１４は同じ速度で逆方向に回転される。そして、本実施形態では、二本のカム軸１３、１４のうち、吸気カム軸１４にのみタイミングギヤ２０が取付けられている。このタイミングギヤ２０には、クランク軸の回転を伝達するタイミングチェーン２１が掛け回されている。そのため、二本のカム軸１３、１４は、クランク軸の回転に同期して、クランク軸の回転速度の１／２の回転速度で、互いに逆方向に回転する。   In this embodiment, a gear 19 is attached to one axial end of the two camshafts 13 and 14, that is, for example, the axial end on the side visible in FIG. These gears 19 mesh with each other and have the same number of teeth. Accordingly, the two camshafts 13 and 14 are rotated in the opposite directions at the same speed. In this embodiment, the timing gear 20 is attached only to the intake camshaft 14 of the two camshafts 13 and 14. A timing chain 21 that transmits the rotation of the crankshaft is wound around the timing gear 20. For this reason, the two camshafts 13 and 14 rotate in opposite directions at a rotational speed that is half the rotational speed of the crankshaft in synchronization with the rotation of the crankshaft.

また、タイミングギヤ２０が取付けられていない排気カム軸１３のギヤ１９のエンジン上方には、前記吸入フランジ１６に隣接してカムハウジング側ボス部２２が１カ所形成され、そのカムハウジング側ボス部２２にはねじ穴が１つ形成されている。また、排気カム軸１３のギヤ１９のエンジン下方には、シリンダヘッド側ボス部２３が２カ所形成され、夫々に１つずつねじ穴が形成されている。このうちカムハウジング側ボス部２２のねじ穴は、バキュームポンプ３の本体部４に形成されたポンプ上部側ボス部８に、シリンダヘッド側ボス部２３はポンプ下部側ボス部９に対応している。また、ギヤ１９が取付けられている排気カム軸１３の軸方向端部には、バキュームポンプ３の係合爪１２が嵌合する係合溝２５が形成されている。   Further, a cam housing side boss portion 22 is formed at one location adjacent to the intake flange 16 above the engine of the gear 19 of the exhaust cam shaft 13 to which the timing gear 20 is not attached. Is formed with one screw hole. Also, two cylinder head side boss portions 23 are formed below the engine of the gear 19 of the exhaust camshaft 13, and one screw hole is formed for each. Among these, the screw hole of the cam housing side boss portion 22 corresponds to the pump upper side boss portion 8 formed in the main body portion 4 of the vacuum pump 3, and the cylinder head side boss portion 23 corresponds to the pump lower side boss portion 9. . Further, an engagement groove 25 into which the engagement claw 12 of the vacuum pump 3 is fitted is formed at the axial end of the exhaust camshaft 13 to which the gear 19 is attached.

この係合溝２５にバキュームポンプ３の係合爪１２を嵌合し、カムハウジング側ボス部２２にポンプ上部側ボス部８をあてがい、シリンダヘッド側ボス部２３にポンプ下部側ボス部９をあてがう。その状態で、ポンプ上部側ボス部８に挿入したボルト１０をカムハウジング側ボス部２２のねじ穴にねじ込み、ポンプ下部側ボス部９に挿入したボルト１０をシリンダヘッド側ボス部２３のねじ穴にねじ込む。更に、これらのボルト１０をカムハウジング側ボス部２２のねじ穴及びシリンダヘッド側ボス部２３のねじ穴の夫々に締め付けることで、バキュームポンプ３がカムハウジング２及びシリンダヘッド下部１ａ、即ちシリンダヘッド１に固定される。これにより、バキュームポンプ３のポンプ軸５は排気カム軸１３の軸方向端部に接続されると共に、バキュームポンプ３の本体部４によってカムハウジング２とシリンダヘッド１とが連結される。なお、このようにバキュームポンプ３をシリンダヘッド１及びカムハウジング２に取付けることにより、バキュームポンプ３のポンプ吸入口２７はカムハウジング２の吸入口１５に接続され、後述するシリンダヘッド内負圧通路２４及び配管連結部２６を介して、第１負圧取出し口１７及び第２負圧取出し口１８の気体を吸入することができるように構成される。   The engagement claw 12 of the vacuum pump 3 is fitted into the engagement groove 25, the pump upper side boss part 8 is assigned to the cam housing side boss part 22, and the pump lower side boss part 9 is assigned to the cylinder head side boss part 23. . In this state, the bolt 10 inserted into the pump upper boss 8 is screwed into the screw hole of the cam housing boss 22, and the bolt 10 inserted into the pump lower boss 9 is inserted into the cylinder head boss 23. Screw in. Further, by tightening these bolts 10 into the screw holes of the cam housing side boss portion 22 and the screw holes of the cylinder head side boss portion 23, the vacuum pump 3 is connected to the cam housing 2 and the cylinder head lower portion 1 a, that is, the cylinder head 1. Fixed to. Thereby, the pump shaft 5 of the vacuum pump 3 is connected to the axial end portion of the exhaust cam shaft 13, and the cam housing 2 and the cylinder head 1 are connected by the main body portion 4 of the vacuum pump 3. By attaching the vacuum pump 3 to the cylinder head 1 and the cam housing 2 in this way, the pump suction port 27 of the vacuum pump 3 is connected to the suction port 15 of the cam housing 2, and a negative pressure passage 24 in the cylinder head to be described later. In addition, the gas from the first negative pressure outlet 17 and the second negative pressure outlet 18 can be sucked through the pipe connecting portion 26.

なお、このバキュームポンプ３が取付けられたカムハウジング２及びシリンダヘッド下部１ａ、即ちシリンダヘッド１の端面は、図示しないカバーが取付けられている。このカバーをカムハウジング２及びシリンダヘッド下部１ａの端面に取付けることで、バキュームポンプ３が覆われ、カムハウジング２の端面及びシリンダヘッド下部１ａの端面が密閉される。そして、このカバーにより、バキュームポンプ３の作動時に発生する騒音を遮音することができる。   A cover (not shown) is attached to the cam housing 2 and the cylinder head lower portion 1a to which the vacuum pump 3 is attached, that is, the end face of the cylinder head 1. By attaching this cover to the end surfaces of the cam housing 2 and the cylinder head lower portion 1a, the vacuum pump 3 is covered, and the end surface of the cam housing 2 and the end surface of the cylinder head lower portion 1a are sealed. And this cover can isolate the noise generated when the vacuum pump 3 is operated.

前記シリンダヘッド内負圧通路２４は、バキュームポンプ３のポンプ吸入口２７に接続される吸入口１５と負圧作動機器に接続される負圧取出し口１７、１８とを個別に連絡するものであり、本実施形態では、シリンダヘッド１の壁内、より具体的にはカムハウジング２の外壁内に形成されている。また、配管連結部２６は、シリンダヘッド内負圧通路２４に接続されて第１負圧取出し口１７又は第２負圧取出し口１８を連結するものであり、本実施形態では、シリンダヘッド１の壁部の外側、より具体的にはカムハウジング２の外壁部の外側に配置されている。つまり、バキュームポンプ３のポンプ吸入口２７は、シリンダヘッド１、より具体的にはカムハウジング２の吸入口１５からシリンダヘッド内負圧通路２４を経て配管連結部２６の第１負圧取出し口１７又は第２負圧取出し口１８に接続されている。前述のように第１負圧取出し口１７はターボチャージャ制御用ＶＳＶ５２に、第２負圧取出し口１８は負圧倍力装置５１に接続されているから、バキュームポンプ３の負圧はシリンダヘッド内負圧通路２４を介して、これらの負圧作動機器に供給される。   The cylinder head negative pressure passage 24 individually communicates the suction port 15 connected to the pump suction port 27 of the vacuum pump 3 and the negative pressure extraction ports 17 and 18 connected to the negative pressure operating device. In this embodiment, it is formed in the wall of the cylinder head 1, more specifically in the outer wall of the cam housing 2. In addition, the pipe connecting portion 26 is connected to the negative pressure passage 24 in the cylinder head and connects the first negative pressure extraction port 17 or the second negative pressure extraction port 18. It is arranged outside the wall, more specifically outside the outer wall of the cam housing 2. That is, the pump suction port 27 of the vacuum pump 3 is connected to the first negative pressure take-out port 17 of the pipe connecting portion 26 from the cylinder head 1, more specifically, the suction port 15 of the cam housing 2 through the cylinder head negative pressure passage 24. Alternatively, it is connected to the second negative pressure outlet 18. As described above, since the first negative pressure outlet 17 is connected to the turbocharger control VSV 52 and the second negative pressure outlet 18 is connected to the negative pressure booster 51, the negative pressure of the vacuum pump 3 is reduced in the cylinder head. These negative pressure operating devices are supplied via the negative pressure passage 24.

シリンダヘッド内負圧通路２４は、カムハウジング２の吸入口１５に連絡する連通路２８と、配管連結部２６に連絡し且つ連通路２８の軸線に軸線が直交し且つ軸線が直線状の連結穴２９とを備えて構成される。本実施形態では、吸入口１５と第１負圧取出し口１７を連絡するシリンダヘッド内負圧通路２４、並びに吸入口１５と第２負圧取出し口１８を連絡するシリンダヘッド内負圧通路２４の２つの系のシリンダヘッド内負圧通路２４が形成されているが、吸入口１５に連絡する連通路２８は共通である。つまり、１つの連通路２８に、２つの連結穴２９が接続され、夫々の連結穴２９の軸線は連通路２８の軸線と直交する。本実施形態では、第１負圧取出し口１７と第２負圧取出し口１８とは吸入口１５を挟んで逆向きに配置されているので、連通路２８に直交する２つ系統の連結穴２９は、例えば平面視で、連通路２８を挟んで直線状に配置される。連結穴２９の外壁をなす部分はカムハウジング２の外壁、つまりシリンダヘッド１の外壁から突出するリブ形状となるので、互いに逆向きに形成される連結穴２９の外壁は、シリンダヘッド１の外壁に連続するリブ形状となり、シリンダヘッド１の剛性が向上する。なお、バキュームポンプ３内には、図４に示すように逆止弁３０が内装されているが、本実施形態のように２系統のシリンダヘッド内負圧通路２４を形成する場合であっても、逆止弁３０を共用できる。ちなみに、この逆止弁３０は、エンジン停止時にシリンダヘッド内負圧通路２４内の負圧を維持するためのものである。   The negative pressure passage 24 in the cylinder head is connected to a communication passage 28 that communicates with the suction port 15 of the cam housing 2, a connection hole that communicates with the pipe connection portion 26, and whose axis is orthogonal to the axis of the communication passage 28 and whose axis is linear. 29. In the present embodiment, a cylinder head negative pressure passage 24 that communicates the suction port 15 and the first negative pressure extraction port 17, and a cylinder head negative pressure passage 24 that communicates the suction port 15 and the second negative pressure extraction port 18. Two cylinder head negative pressure passages 24 of the two systems are formed, but the communication passage 28 communicating with the suction port 15 is common. That is, two connection holes 29 are connected to one communication path 28, and the axis of each connection hole 29 is orthogonal to the axis of the communication path 28. In the present embodiment, the first negative pressure extraction port 17 and the second negative pressure extraction port 18 are disposed in opposite directions with the suction port 15 in between, and therefore, two systems of connection holes 29 orthogonal to the communication path 28. Are arranged in a straight line across the communication path 28 in a plan view, for example. Since the portion forming the outer wall of the connecting hole 29 has a rib shape protruding from the outer wall of the cam housing 2, that is, the outer wall of the cylinder head 1, the outer wall of the connecting hole 29 formed in the opposite direction is formed on the outer wall of the cylinder head 1. It becomes a continuous rib shape, and the rigidity of the cylinder head 1 is improved. In addition, although the check valve 30 is built in the vacuum pump 3 as shown in FIG. 4, even in the case where two systems of negative pressure passages 24 in the cylinder head are formed as in this embodiment. The check valve 30 can be shared. Incidentally, the check valve 30 is for maintaining the negative pressure in the cylinder head negative pressure passage 24 when the engine is stopped.

また、本実施形態では、図２に示すように、各シリンダヘッド内負圧通路２４の連結穴２９の軸線を、配管連結部２６側よりも連通路２８側がエンジン上下方向で下方になるように設定した。これにより、シリンダヘッド内負圧通路２４内の水分や油分が吸入口１５側、つまりバキュームポンプ３側に集まる。バキュームポンプ３は、シリンダヘッド内負圧通路２４内の空気を吸入して排出するので、バキュームポンプ３側に集められた水分や油分もバキュームポンプ３によって吸入されて排出される。   Further, in the present embodiment, as shown in FIG. 2, the axis of the connection hole 29 of each cylinder head negative pressure passage 24 is set so that the communication passage 28 side is lower in the engine vertical direction than the pipe connection portion 26 side. Set. As a result, moisture and oil in the cylinder head negative pressure passage 24 gather on the suction port 15 side, that is, on the vacuum pump 3 side. Since the vacuum pump 3 sucks and discharges air in the cylinder head negative pressure passage 24, the water and oil collected on the vacuum pump 3 side are also sucked and discharged by the vacuum pump 3.

このように本実施形態のエンジンの負圧供給装置では、エンジンのシリンダヘッド１にバキュームポンプ３が取付けられ、バキュームポンプ３のポンプ吸入口２７に接続される吸入口１５と負圧作動機器に接続される負圧取出し口１７、１８とを連絡するシリンダヘッド内負圧通路２４がシリンダヘッド１の壁内に形成され、シリンダヘッド内負圧通路２４に接続され且つ負圧取出し口１７、１８を連結するための配管連結部２６がシリンダヘッド１の壁部の外側に配置される。そのため、負圧取出し口１７、１８から負圧作動機器までの配管構造を簡略化することができる。また、負圧取出し口１７、１８から負圧作動機器までの配管構造がゴムホース５５である場合に、ゴムホース５５の配管区間を短縮することができ、バキュームポンプ３で発生した負圧が負圧作動機器へ伝わるまでの負圧伝達性能が向上する。また、シリンダヘッド１の熱によってシリンダヘッド内負圧通路２４内における空気中の水分の凍結を防止することができる。   As described above, in the engine negative pressure supply device according to the present embodiment, the vacuum pump 3 is attached to the cylinder head 1 of the engine, and is connected to the suction port 15 connected to the pump suction port 27 of the vacuum pump 3 and the negative pressure operating device. A negative pressure passage 24 in the cylinder head that communicates with the negative pressure outlets 17 and 18 is formed in the wall of the cylinder head 1 and is connected to the negative pressure passage 24 in the cylinder head and connected to the negative pressure outlets 17 and 18. A pipe connection portion 26 for connection is disposed outside the wall portion of the cylinder head 1. Therefore, the piping structure from the negative pressure outlets 17 and 18 to the negative pressure operating device can be simplified. Further, when the piping structure from the negative pressure outlets 17 and 18 to the negative pressure operating device is the rubber hose 55, the piping section of the rubber hose 55 can be shortened, and the negative pressure generated by the vacuum pump 3 is negative pressure operated. The negative pressure transmission performance until it is transmitted to the equipment is improved. In addition, the moisture in the air in the cylinder head negative pressure passage 24 can be prevented from freezing by the heat of the cylinder head 1.

また、シリンダヘッド内負圧通路２４は、吸入口１５に連絡する連通路２８と、配管連結部２６に連絡し且つ連通路２８の軸線に軸線が直交し且つ軸線が直線状の連結穴２９とを備えて構成される。そのため、１つの連通路２８に軸線が直交する２つの連結穴２９を互いに逆向きに形成する場合には、連通路２８及び連結穴２９の外壁を構成するリブがシリンダヘッド１の壁部外側に連続して形成され、シリンダヘッド１の剛性を高めることが可能となる。また、これにより、カム軸に取付けられたギヤ音やタイミングチェーンの作動音などのエンジン内部の音を遮音する性能も向上する。また、３つ以上の負圧取出し口を設ける場合であっても、１つの連通路２８に３つ以上の連結穴２９を接続することで全ての負圧取出し口をシリンダヘッド１に配置することができ、負圧取出し口のレイアウトが容易になる。   The negative pressure passage 24 in the cylinder head includes a communication passage 28 that communicates with the suction port 15, a connection hole 29 that communicates with the pipe connection portion 26, and whose axis is orthogonal to the axis of the communication passage 28 and whose axis is linear. It is configured with. Therefore, when two connecting holes 29 whose axes are orthogonal to each other are formed in one communication path 28 in opposite directions, the ribs constituting the outer walls of the communication path 28 and the connection hole 29 are formed outside the wall portion of the cylinder head 1. It is formed continuously, and the rigidity of the cylinder head 1 can be increased. This also improves the performance of isolating engine internal sounds such as gear noise attached to the camshaft and timing chain operating noise. Even when three or more negative pressure outlets are provided, all of the negative pressure outlets are arranged in the cylinder head 1 by connecting three or more connecting holes 29 to one communication path 28. And the layout of the negative pressure outlet becomes easy.

また、配管連結部２６側よりも連通路２８側がエンジン上下方向で下方になるように連結穴２９の軸線を設定した。これにより、シリンダヘッド内負圧通路２４内の水分や油分などの液体をバキュームポンプ３側に集めてバキュームポンプ３から排出することが可能となる。   In addition, the axis of the connection hole 29 was set so that the communication passage 28 side was lower in the engine vertical direction than the pipe connection portion 26 side. As a result, liquid such as moisture and oil in the cylinder head negative pressure passage 24 can be collected on the vacuum pump 3 side and discharged from the vacuum pump 3.

１はシリンダヘッド
２はカムハウジング
３はバキュームポンプ
４は本体部
５はポンプ軸
６はハウジング
７は蓋体
８はポンプ上部側ボス部
９はポンプ下部側ボス部
１０はボルト
１１は締結具
１２は係合爪
１３は排気カム軸
１４は吸気カム軸
１５は吸入口
１６は吸入フランジ
１７は第１負圧取出し口
１８は第２負圧取出し口
１９はギヤ
２０はタイミングギヤ
２１はタイミングチェーン
２２はカムハウジング側ボス部
２３はシリンダヘッド側ボス部
２４はシリンダヘッド内負圧通路
２５は嵌合溝
２６は配管連結部
２７はポンプ吸入口
２８は連通路
２９は連結穴
５１は負圧倍力装置
５２はターボチャージャ制御用ＶＳＶ
５３はマスタシリンダ
５４はターボチャージャ
５５はゴムホース
1 is a cylinder head 2 is a cam housing 3 is a vacuum pump 4 is a main body part 5 is a pump shaft 6 is a housing 7 is a lid body 8 is a pump upper side boss part 9 is a pump lower side boss part 10 is a bolt 11 is a fastener 12 The engaging claw 13 is an exhaust camshaft 14 is an intake camshaft 15 is a suction port 16 is a suction flange 17 is a first negative pressure outlet 18 is a second negative pressure outlet 19 is a gear 20 is a timing gear 21 is a timing chain 22 Cam housing side boss portion 23 is cylinder head side boss portion 24 is cylinder head negative pressure passage 25 is fitting groove 26 is pipe connection portion 27 is pump suction port 28 is communication passage 29 is connection hole 51 is a negative pressure booster 52 is VSV for turbocharger control
53 is a master cylinder 54 is a turbocharger 55 is a rubber hose

Claims (3)

エンジンのカム軸の軸方向端部でシリンダヘッドに取り付けられ、前記カム軸によって駆動されて負圧作動機器に負圧を供給するバキュームポンプと、
前記負圧作動機器に負圧を送る配管が連結され、前記バキュームポンプからの負圧が前記配管へ取り出される負圧取出し口と、を備えたエンジンの負圧供給装置において、
前記カム軸の軸線と同方向に延びて前記シリンダヘッドに設けられ、前記バキュームポンプのポンプ吸入口と連結する吸入口を備えた吸入フランジと、
前記シリンダヘッドの壁内に形成され、前記吸入フランジの前記吸入口と前記負圧作動機器に接続される負圧取出し口とを連絡するシリンダヘッド内負圧通路と、を備え、
前記シリンダヘッド内負圧通路は、前記カム軸の軸線と同方向に形成され前記吸入フランジの前記吸入口に連通する連通路と、
前記連通路の軸線に対して軸線が直交し且つ軸線が直線状に形成された連結穴と、から形成され、
前記連結穴は、一端が前記連通路の端部と連通し、他端が前記負圧取出し口が配置される配管連結部と連通し、
前記連結穴の外壁をなす部分は前記シリンダヘッドの外壁から突出するリブ形状に形成されていることを特徴とするエンジンの負圧供給装置。 A vacuum pump attached to a cylinder head at an axial end of an engine camshaft and driven by the camshaft to supply negative pressure to a negative pressure operating device;
In a negative pressure supply device for an engine, a pipe for sending negative pressure to the negative pressure operating device is connected, and a negative pressure outlet from which the negative pressure from the vacuum pump is taken out to the pipe .
A suction flange provided in the cylinder head extending in the same direction as the axis of the cam shaft, and having a suction port connected to a pump suction port of the vacuum pump;
A negative pressure passage in the cylinder head that is formed in the wall of the cylinder head and communicates the suction port of the suction flange and a negative pressure outlet connected to the negative pressure operating device ,
The negative pressure passage in the cylinder head is formed in the same direction as the axis of the cam shaft and communicates with the suction port of the suction flange;
A connecting hole in which the axis is orthogonal to the axis of the communication path and the axis is formed in a straight line,
One end of the connection hole communicates with the end of the communication path, and the other end communicates with a pipe connection portion where the negative pressure outlet is disposed,
A negative pressure supply device for an engine, wherein a portion forming the outer wall of the connection hole is formed in a rib shape protruding from the outer wall of the cylinder head . 前記連結穴は少なくとも２つ設けられ、これらの連結穴のうちの２つの連結穴の一方は連結穴の端部を起点としてエンジン前方向に延びるように配置されており、他方は連結穴の端部を起点としてエンジン後方向に延びるように配置され、
前記一方の連結穴と他方の連結穴は一直線状に並び、エンジン前後方向の穴は共通の穴で構成されることを特徴とする請求項１に記載のエンジンの負圧供給装置。 At least two of the connecting holes are provided, and one of the two connecting holes is arranged to extend in the front of the engine starting from the end of the connecting hole, and the other is the end of the connecting hole. It is arranged to extend in the rear direction of the engine starting from the part,
2. The engine negative pressure supply device according to claim 1, wherein the one connection hole and the other connection hole are arranged in a straight line, and the holes in the longitudinal direction of the engine are configured as a common hole . 前記連結穴は、前記配管連結部側よりも前記連通路側がエンジン上下方向で下方になるように軸線が設定されていることを特徴とする請求項１又は２に記載のエンジンの負圧供給装置。   3. The negative pressure supply device for an engine according to claim 1, wherein an axis of the connection hole is set so that the communication path side is downward in the engine vertical direction than the pipe connection portion side. 4. .
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CN103967642B (en) 2018-01-12

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