JP2017048707A - Positioning structure of cylinder head cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively improve the positioning accuracy of a cylinder head cover with a simple structure.SOLUTION: The invention relates to a positioning structure of a cylinder head cover 10 of an engine in which an upper part of a cylinder head 20, on which a cam shaft 25 is disposed, is covered with the cylinder head cover 10. The positioning structure of the cylinder head cover 10 includes: an oil shower pipe 13 provided at the cylinder head cover 10 and configured to jet an oil to the cam shaft 25; a cylindrical protruding part 22 which is provided protruding from the cylinder head 20 side and has a supply opening 23 for supplying the oil to the oil shower pipe 13; and a nozzle part 15 which is provided at an upstream end of the oil shower pipe 13 and is inserted and fitted into the supply opening 23 to determine an attachment relative position of the cylinder head cover 10 relative to the cylinder head 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a positioning structure for a cylinder head cover.

  Generally, a cylinder head cover of an engine is attached to the upper surface of the cylinder head by fastening and fixing with a bolt.

  For example, in Patent Document 1, a bolt is inserted from above into a through hole of an outer peripheral flange portion of a cylinder head cover, and a shaft portion of the bolt is screwed into a bolt hole on a corresponding upper surface of the cylinder head. A structure for fixing to a cylinder head is disclosed.

  Further, in Patent Document 2, a pin fitting hole is provided on the cylinder head side, and a positioning pin protruding downward is provided on the lower surface of the cylinder head cover. When the cylinder head cover is assembled to the cylinder head, the pin fitting hole is provided. A structure is disclosed in which the positioning of the cylinder head and the cylinder head cover can be performed by inserting a positioning pin.

JP 2004-270561 A JP 2005-163697 A

  In recent years, due to engine downsizing, the clearance between the camshaft disposed above the cylinder head and the cylinder head cover tends to be narrowed. For this reason, for example, if a stud bolt or the like having a large tolerance is used for positioning of the cylinder head cover, the positioning accuracy may be reduced, and interference between the cylinder head cover and the camshaft may be caused.

  Further, when positioning pins are individually provided on the cylinder head cover, it is necessary to form a boss portion or the like for holding the positioning pins on the cylinder head cover, and there is a problem that affects the weight increase and clearance of the cylinder head cover.

  The disclosed positioning structure is intended to effectively improve the positioning accuracy of the cylinder head cover with a simple configuration.

  The disclosed positioning structure is an engine cylinder head cover positioning structure in which an upper portion of a cylinder head on which a camshaft is disposed is covered with a cylinder head cover, and is provided in the cylinder head cover and injects oil onto the camshaft. A tube, a cylindrical projection provided to protrude from the cylinder head side and having a supply opening for supplying oil to the oil shower pipe, and provided at an upstream end of the oil shower pipe and fitted into the supply opening. A nozzle portion that determines a mounting relative position of the cylinder head cover to the cylinder head by being inserted.

  The cylindrical projecting portion may be provided so as to project upward from the cylinder head side, and the nozzle portion may be formed by bending the upstream end of the oil shower pipe downward.

  An elastic seal member that seals a gap between the outer periphery and the inner periphery of the supply opening may be provided on the outer periphery of the nozzle portion.

  At least one of the tip outer corner portion of the nozzle portion or the supply opening side corner portion of the cylindrical projecting portion may be chamfered at a predetermined angle.

  According to the disclosed positioning structure, the positioning accuracy of the cylinder head cover can be effectively improved with a simple configuration.

It is the typical perspective view which notched and showed a part of cylinder head cover which concerns on one Embodiment of this invention. It is typical sectional drawing explaining the connection structure of the nozzle part which concerns on one Embodiment of this invention, and a cylindrical protrusion part.

  A cylinder head cover positioning structure according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a schematic perspective view in which a part of a cylinder head cover 10 of the present embodiment is cut away. The cylinder head cover 10 of this embodiment is attached to the upper part of the cylinder head 20 of a multi-cylinder in-line engine in which a plurality of cylinders are arranged in series in the longitudinal direction (crankshaft direction) of the engine, for example.

  In FIG. 1, reference numeral 21 denotes a cam carrier disposed on the upper surface of the cylinder head 20, and reference numeral 25 denotes an intake camshaft which is disposed in the longitudinal direction of the engine and is rotatably supported by the cam carrier 21. Show. The exhaust camshaft extending in parallel with the intake camshaft 25 is not shown.

  As shown in FIG. 1, a plurality of bolt insertion holes 12 through which bolts (not shown) for fastening the cylinder head cover 10 to the cylinder head 20 are inserted are formed in the outer peripheral flange portion 11 of the cylinder head cover 10. In addition, the cylinder head cover 10 branches from the intake side oil shower pipe 13A extending above the intake camshaft 25 and the intake side oil shower pipe 13A, and extends above the exhaust camshaft (not shown). The exhaust-side oil shower pipe 13B is provided. These oil shower tubes 13 are provided with a plurality of oil injection holes 14 for injecting oil toward the camshaft 25.

  The cam carrier 21 is provided with a cylindrical protrusion 22 that protrudes upward and supplies oil that is pumped from the cylinder head 20 side to the oil shower pipe 13. The cylindrical protrusion 22 is formed with a supply opening 23 into which a nozzle portion 15, which will be described later in detail, is fitted. The corner of the cylindrical protrusion 22 on the supply opening 23 side is chamfered at a predetermined angle so that the upper opening side of the supply opening 23 becomes larger (see FIG. 2).

  Next, based on FIG. 2, the detail of the connection structure of the nozzle part 15 of this embodiment and the cylindrical protrusion part 22 is demonstrated.

  The nozzle portion 15 is formed by bending the upstream end side of the oil shower pipe 13 downward at a substantially right angle. More specifically, the nozzle portion 15 includes a cylindrical insertion portion 15A that is inserted into the supply opening 23 of the cylindrical projection portion 22, an annular groove 15B that is formed in the circumferential direction on the outer periphery of the insertion portion 15A, and A ring-shaped seal member 15C formed of an elastic member such as a rubber material or a silicon material and mounted in the annular groove 15B is provided.

  The insertion portion 15 </ b> A has an outer diameter that is substantially the same as the inner diameter of the supply opening 23. The gap between the insertion portion 15A and the supply opening 23 is securely sealed by the ring-shaped seal member 15C mounted in the annular groove 15B being pressed against the inner peripheral surface of the supply opening 23. It has become so.

  The outer corner portion of the insertion portion 15A is chamfered at a predetermined angle so that the outer diameter of the insertion portion 15A is reduced toward the distal end side. That is, the nozzle portion 15 can be easily inserted into the supply opening 23 of the cylindrical protrusion 22 by chamfering the outer corner of the distal end of the insertion portion 15A and the opening-side corner of the cylindrical protrusion 22. It has become.

  As described above in detail, in the cylinder head cover 10 positioning structure of the present embodiment, the cylindrical protrusion 22 having the nozzle opening 15 at the upstream end of the oil shower pipe 13 and the supply opening 23 in the cam carrier 21. The nozzle head 15 is inserted into the supply opening 23 so that the cylinder head cover 10 can be easily positioned relative to the cylinder head 20. The nozzle portion 15 and the supply opening 23 are formed to have substantially the same diameter, and the nozzle portion 15 is inserted into the supply opening 23.

  That is, according to the positioning structure of the present embodiment, the positioning accuracy is improved by inserting the nozzle portion 15 having substantially the same diameter into the supply opening 23 as compared with the conventional positioning structure using a stud bolt having a large tolerance. Can be effectively improved, and interference between the cylinder head cover 10 and the camshaft 25 can be reliably prevented.

  In addition, compared to the conventional structure in which positioning fitting pins, fitting pin holes and the like are individually set, it is possible to suppress an increase in the number of parts and an increase in weight by using the existing oil shower pipe 13. The space and clearance in the head cover 10 can be effectively secured.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, the cylinder head cover 10 has been described as being attached to the cylinder head 20, but may be attached to the cam carrier 21. Further, the engine is not limited to a multi-cylinder in-line engine, and can be widely applied to other engines.

DESCRIPTION OF SYMBOLS 10 Cylinder head cover 11 Outer peripheral flange part 12 Bolt insertion hole 13A Intake side oil shower pipe 13B Exhaust side oil shower pipe 14 Oil injection hole 15 Nozzle part 15A Insertion part 15B Annular groove 15C Ring-shaped sealing member 20 Cylinder head 21 Cam carrier 22 Cylinder Protrusion 23 Supply opening 25 Intake camshaft

Claims (4)

An engine cylinder head cover positioning structure in which an upper part of a cylinder head on which a camshaft is arranged is covered with a cylinder head cover,
An oil shower pipe provided on the cylinder head cover for injecting oil onto the camshaft;
A cylindrical projecting portion provided to project from the cylinder head side and having a supply opening for supplying oil to the oil shower tube;
A cylinder head cover positioning structure, comprising: a nozzle portion that is provided at an upstream end of the oil shower pipe and that is fitted into the supply opening to determine a mounting relative position of the cylinder head cover to the cylinder head. The positioning of the cylinder head cover according to claim 1, wherein the cylindrical projecting portion is provided so as to project upward from the cylinder head side, and the nozzle portion is formed by bending an upstream end of the oil shower pipe downward. Construction. The cylinder head cover positioning structure according to claim 1, wherein an elastic seal member that seals a gap between the outer periphery and the inner periphery of the supply opening is provided on the outer periphery of the nozzle portion. The positioning structure of the cylinder head cover according to any one of claims 1 to 3, wherein at least one of a front end outer corner of the nozzle portion or a supply opening side corner of the cylindrical protrusion is chamfered at a predetermined angle. .

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