JP2005535817A - Reciprocating piston internal combustion engine cylinder head - Google Patents

Abstract

The present invention relates to a rocker arm frame (1) for a cylinder head of an internal combustion engine, attached to the bottom of the cylinder head and fitted with a cylinder head cap. The rocker arm frame supports a rocker shaft (16) having a rocker arm (17) and extends over the entire cylinder head as an integral part.

Description

  The invention relates to a cylinder head of a reciprocating piston internal combustion engine having the features of the preamble of claim 1.

  Patent Document 1 discloses a cylinder head of an internal combustion engine provided with a device for supporting a camshaft and a rocker arm shaft. This device is mounted on its upper side, approximately in the middle of the cylinder head, and extends from the first cylinder to the last cylinder. A cylinder head cover covers the device and is attached to the cylinder head in a form that forms a seal. This device is a relatively narrow component that is mounted only on the rocker arm shaft and camshaft.

German Patent Invention No. 195 04 637 C2 Specification

  In view of the above, it is an object of the present invention to make available a cylinder head with a device for supporting the shaft and / or shaft of a valve drive control device, which device is essentially robust. The cylinder head is reinforced and is easy to install.

  This object is achieved by a cylinder head having the features of claim 1.

  The cylinder head according to the present invention comprises a cylinder head bottom, a cylinder head cover, and a device for supporting a camshaft and / or rocker arm shaft. This device is embodied as a frame and mounted on the bottom of the cylinder head. In order to prevent the oil from flowing around, a seal, for example a liquid seal, is inserted between the frame and the cylinder head bottom. The cylinder head provided with the frame is also provided with a seal, and is closed from above by a cylinder head cover attached to the frame. Since the frame is supported over a large area on the cylinder head, it is inherently very strong and is bolted to the bottom of the cylinder head, thus reinforcing the entire cylinder head assembly. The shaft and / or shaft can be separately pre-mounted in the frame, which simplifies the manufacturing process on the production line.

  In one refinement of the invention, when the cylinder head is embodied as an individual cylinder head, a plurality of devices for supporting the shaft and / or shaft are integrated into an adjacent frame on each adjacent cylinder head. Formed as. In this way, the individual cylinder heads are connected at the upper side by the strong frame, and the entire cylinder head assembly becomes stronger. A further advantage is the extremely simple installation, in which a plurality of individual frames are mounted on the individual cylinder heads of a row of cylinders, rather than mounting each individual frame on an individual cylinder head. It is possible to do.

  In a further refinement of the invention, the shaft mounted in the frame and located above the cylinder head bottom is embodied as a rocker arm shaft or a valve lever shaft. In one embodiment of an internal combustion engine with a camshaft and intake and exhaust valves that actuate the tappet rod in the cylinder head, the tappet rod movement is generally deflected by a rocker arm. These rocker arms rotate or swing on an axis supported in a frame mounted on the cylinder head bottom according to the present invention.

  In a further refinement of the invention, the frame comprises a device for supplying lubricating oil to the valve drive control device. Pre-fabricated, cast or bored lines or ducts in the frame, for example, valve drive control devices such as rocker arms or valve levers, elements to compensate for hydraulic valve play, or control time Lubricant supply to all locations to be lubricated in the switching element, which is actuated with hydraulic pressure for influence, is easily available. If the flow of lubricating oil is dispersed inside the frame, it is only necessary to provide one oil transfer point in the frame, so whether to design the cylinder head as one block or as individual cylinder heads Not limited to this, the bottom of the cylinder head can be produced more easily and more cost-effectively.

  In a further refinement of the invention, the frame comprises a device for controlling the valve for the auxiliary brake. When an internal combustion engine is used in a versatile vehicle, the engine is often provided with an auxiliary brake. That is, each cylinder of the internal combustion engine is provided with a valve that opens too early, for example, at the end of the compression stroke. Braked. Such a valve is operated, for example, directly with hydraulic pressure, or a mechanical means for activating such a valve is hydraulically operated. In such a situation, according to the present invention, the necessary hydraulic and supply lines are integrated into the frame at the top of the cylinder head bottom. These lines or ducts are cast or formed in the frame. If the line or duct is integrated in the frame, the installation costs are considerably simplified. The integrated line eliminates the need for sealing locations on line connections that are expensive to manufacture and seal.

  In a further refinement of the invention, the fuel low pressure line is integrated in the frame. By integrating the fuel low pressure line into the frame, installation costs are further reduced. Furthermore, only one fuel system path needs to be passed through the cylinder head, and the fuel injectors of the individual cylinders are distributed inside the frame, so that the structure is not too complicated, especially in the fuel system. The risk of leakage at the connection is reduced. Such an integrated fuel line can be used as a forward or return flow of fuel, or a combination of these, as a forward and return flow of fuel.

  In a further refinement of the invention, the frame comprises a connector for the fuel injector. By screwing the fuel injector directly to the frame, there is no need to add a fuel system, and the fuel injector is strong and connected to the cylinder head without the need for additional fixing means. In this way, a means for securing the injector and supplying fuel that is reliable in terms of installation and operation becomes available.

  In a further refinement of the invention, a high-pressure line for controlling fuel injection is integrated in the frame. If the fuel injector is not actuated by a camshaft using arms and similar transmission elements, but operates for example with oil under high pressure, the oil injector is used to prevent high pressure lines from becoming mixed during installation. This high-pressure line for the is advantageously integrated in the frame.

  In a further refinement of the invention, the frame comprises a device for venting the cooling system of the internal combustion engine. In an embodiment of the internal combustion engine with individual cylinder heads, it is particularly advantageous to have a frame on top of the individual cylinder heads with ventilation equipment. This is because individual cylinder heads do not have continuous water holes through all cylinders. For this reason, each individual cylinder head must be provided with a means for venting the coolant system at the highest point of its geodesic line, i.e. a port having a line to, for example, a coolant means balancing vessel. In an embodiment with a frame covering all cylinders, it is advantageous to provide an overflow point in each individual cylinder head for the coolant into the coolant duct in the frame. Since the frame is generally higher in the geodesic line than the bottom of the cylinder head, only one venting means need be provided in the coolant duct in the frame. In this way, the parts and installation costs for venting the coolant system in the cylinder head are considerably reduced. At the same time, operational reliability is significantly improved by reducing the number of lines and line connections.

  In a further refinement of the invention, the shaft bearing is embodied as a bush type bearing. In one embodiment of the rocker arm shaft or camshaft bearing as a bush type bearing, the frame retains its rigidity and the bearing port can be easily manufactured. In one embodiment with a bearing lid, the frame is less rigid and the bearing port can be more costly when the shaft is manufactured and installed.

  Additional features and feature combinations are set forth in the following description and drawings. Certain exemplary embodiments of the invention are shown in simplified form in the drawings and are explained in more detail in the following description.

  FIG. 1 is a perspective view showing a frame 1 according to the present invention for supporting a rocker arm shaft on a plurality of individual cylinder heads (not shown) of a multi-cylinder reciprocating piston engine. The frame 1 covers a plurality of individual cylinder heads (not shown) that are screwed with threaded holes 2. For ease of viewing, the frame 1 is shown in cross-section on a plane 3 between the two cylinders. The cross-sectional area of the frame shown in FIG. 1 is allocated to the three cylinder heads of the reciprocating piston engine and is therefore divided into three frame parts A, B, C.

  The frame 1 comprises two outer walls 4 ′, 4 ″ on the longitudinal side, which walls are each connected to a plane 3 between two cylinders by a transverse plate 5. Only at the central axis M The threaded holes 2 and bearings 6 for the rocker arm shafts shown are arranged on these transverse plates.

  The central axis M of the rocker arm axis (not shown) extends on either side of the frame 1 over its entire length. The frame 1 also includes a base 7 that is partially blocked to further reinforce the frame and to allow passages 8 for valve control elements (not shown) such as tappets, rocker arms, and valves, for example. Have. The base 7 is placed on the upper side of a cylinder head (not shown) and sealed from the outside by a liquid seal or a foam seal disposed between the base 7 and the cylinder head.

  In one outer wall 4 'on the longitudinal side, a fuel forward flow duct 9 and a fuel return flow duct 9' having a fluid connection to a connector 10 for a fuel injector (not shown) are of length. It extends throughout. In this way, it is not necessary to attach a separate fuel line to each fuel injector, and thus in a simpler, more cost effective, more reliable and easier to install manner. The fuel circulation system can be implemented. The same applies to the hydraulic lines 11, 11 ′ integrated in the frame 1 and used to activate the additional hydraulic start valve of the auxiliary brake.

  A lubrication point of a valve driving device (not shown) is supplied via a lubricating oil line 12 in the horizontal plate 5.

  In the longitudinal side outer wall 4 ′, an integrated high-pressure oil duct 13 used to supply high-pressure oil to a hydraulically supported, electrically activated fuel injector spans the entire length. Extend.

  A cylinder head cover (not shown) rests on the upper connection surface 14 of the frame, and a leak between the cylinder head cover and the frame is prevented from leaking outward toward the outside.

  A duct 15 for venting the cooling system extends over the entire length of the frame in the outer wall 4 "on the longitudinal side. The duct is a fluid to the cooling path at the highest position in each cylinder. Connected and connected to all cylinders, thus reliable, extremely simple, cost-effective and easy to install to vent the cooling system of the internal combustion engine in the cylinder head A method is obtained for cylinder heads of blocks and for individual cylinder head embodiments.

  FIG. 2 is a perspective view showing the frame 1 of FIG. 1 with the rocker arm shaft 16 and a part of the rocker arm 17 attached thereto. This frame 1 is separately mounted in advance and mounted on the cylinder head as an integral complete unit with a seal. In this way, it can be pre-mounted outside the actual engine mounting device, which has advantages in terms of logistics and manufacturing processes. After the partially attached frame 1 is attached, a fuel injector (not shown) is screwed to the connector 10 and a cylinder head cover (not shown) is attached to the end face 14.

The perspective view which shows the flame | frame by this invention for supporting the rocker arm axis | shaft for cylinder heads by this invention. The perspective view which shows the flame | frame of FIG. 1 provided with the inserted rocker arm and the rocker arm axis | shaft.

Claims (10)

The bottom of the cylinder head,
A cylinder head cover;
A device for supporting the shaft and / or shaft of the valve drive control device;
A cylinder head of a reciprocating piston internal combustion engine, comprising:
A cylinder head, characterized in that the device is embodied as a frame (1) mounted on the bottom of the cylinder head and mounting the cylinder head cover.   A plurality of devices provided on adjacent individual cylinder heads of a multi-cylinder internal combustion engine are embodied as an integral frame (1) composed of two outer walls on the longitudinal side. Item 2. The cylinder head according to Item 1.   3. A cylinder head according to claim 1 or 2, characterized in that the shaft (16) mounted in the device is embodied as a rocker arm shaft or a valve lever shaft.   Cylinder head according to any one of claims 1 to 3, characterized in that the frame (1) comprises a device (12) for supplying lubricating oil to elements of the valve drive control device.   Cylinder head according to any one of the preceding claims, characterized in that the frame (1) comprises a device (11, 11 ') for controlling the valve of the auxiliary brake.   6. The cylinder head according to claim 1, wherein a fuel low-pressure line (9, 9 ′) is integrated in the frame (1).   Cylinder head according to any one of the preceding claims, wherein the frame (1) comprises a connector (10) for a fuel injector.   Cylinder head according to claim 7, characterized in that a high-pressure line (13) for controlling the fuel injection is integrated in the frame (1).   Cylinder head according to any one of the preceding claims, wherein the frame (1) comprises a device (15) for ventilating the cooling system of the internal combustion engine.   10. Cylinder head according to any one of the preceding claims, characterized in that the shaft or shaft bearing (6) is embodied as a bush type bearing.

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