Intake camshaft bed of an internal combustion engine

Abstract

This utility model pertains to mechanical engineering, specifically to cylinder head assemblies for gasoline internal combustion engines. Specifically, the utility model concerns the design of an intake camshaft bed, designed as a standalone, replaceable component for installation on the cylinder head of an EP6 engine without modification and equipped with means for precise relative positioning of the housing and the split cover.The bed of the intake camshaft of an internal combustion engine comprises a housing with support surfaces for the journal of the camshaft and a detachable cover and is distinguished in that the housing is made as a separate replaceable element for installation on the cylinder head of the engine without modification, is provided with mounting holes for standard fastening means to the cylinder head and a pair of centering holes for standard guide bushings of the cylinder head, while in the housing there is an oil supply channel for lubricating the journal of the camshaft, a channel for supplying oil to the cavity between two Teflon sealing rings on the camshaft for feeding the phase shifter clutch and a channel for draining oil from the said cavity, and the housing and the detachable cover are provided with a mutual positioning unit made in the form of two spaced guide elements and corresponding mating mounting holes.This enables the replacement of the bed as a separate unit without replacing the cylinder head, as well as increased accuracy in the relative positioning of the housing and bed cover, which reduces the likelihood of incorrect cover installation during assembly, improves the centering of the Teflon sealing rings, reduces oil leakage from the phase shifter clutch control cavity, reduces wear on mating surfaces, and improves the stability of the phase control system. 4 references, 19 figs.

Description

[0001] This utility model pertains to mechanical engineering, specifically to cylinder head assemblies for gasoline internal combustion engines. Specifically, the utility model concerns the design of an intake camshaft bed, designed as a standalone, replaceable component for installation on the cylinder head of an EP6 engine without modification and equipped with means for precise relative positioning of the housing and split cover.

[0002] The prior art includes, for example, a cylinder head and a cylinder head assembly (variants) according to patent RU 141530 U1 dated June 10, 2014, which relates to engines including recesses for easy access to components and for maintenance. The cylinder head comprises: a combustion chamber portion and a drainage channel including an inlet and outlet opening to the atmosphere external to the cylinder head.

[0003] Also known from the prior art are separate replacement beds for the intake camshaft for engines of the EP6 family, publicly disclosed on the KMD autoparts website in at least two versions: KMDCBR001 (EURO-5, with one hole for supplying oil to the phase shifter) and KMDCBR002 (EURO-4, with two holes for supplying oil to the phase shifter) (https: / / kmd-autoparts.ru / shop / product-bugel-ep6-euro4 and https: / / kmd-autoparts.ru / shop / product-bugel-ep6).

[0004] The closest analogue (prototype) is the specified bed, a separate replaceable element for installation on the cylinder head of the EP6 engine family without modification. It contains a housing, a split cover, mounting holes, and oil channels. The known design lacks special guides for the relative positioning of the housing and cover.

[0005] If there is a gap in the cover mounting holes, precise positioning of the cover relative to the housing during assembly is difficult. This can lead to mutual displacement of the cover and housing, misalignment of the bearing surfaces they form, deterioration of the operating conditions of the Teflon sealing rings, reduced tightness of the oil supply cavity to the phase shifter clutch, oil leaks, and increased wear of the mating surfaces.

[0006] Thus, the known solutions do not simultaneously provide the ability to restore the unit by replacing the bed as a separate repair element and precise, repeatable relative positioning of the body and the bed cover, regardless of the play in the mounting holes.

[0007] The technical problem that the utility model is aimed at solving is to increase the maintainability of the cylinder head unit of the EP6 engine family while simultaneously increasing the accuracy of the relative positioning of the housing and the cover of the intake camshaft bed.

[0008] The technical result consists in the possibility of replacing the bed as a separate unit without replacing the cylinder head, as well as in increasing the accuracy of the relative positioning of the housing and the bed cover, which reduces the likelihood of incorrect installation of the cover during assembly, improves the centering of the Teflon sealing rings, reduces oil leakage from the phase shifter clutch control cavity, reduces wear on the mating surfaces and increases the stability of the phase control system.

[0009] The specified technical result is achieved in that the bed of the intake camshaft of the internal combustion engine contains a housing with support surfaces for the camshaft journal and a detachable cover and is characterized in that the housing is made as a separate replaceable element for installation on the cylinder head of the engine without its modification, is provided with mounting holes for standard fastening means to the cylinder head and a pair of centering holes for standard guide bushings of the cylinder head, while in the housing there is an oil supply channel for lubricating the camshaft journal, a channel for supplying oil to the cavity between two Teflon sealing rings on the camshaft for feeding the phase shifter clutch and a channel for draining oil from the specified cavity, and the housing and the detachable cover are provided with a mutual positioning unit made in the form of two spaced guide elements and corresponding mating holes.

[0010] In addition, the guide elements are made in the form of cylindrical metal pins, installed with tension in the split cover, and the mating mounting holes are made in the body with a calibrated size.

[0011] In addition, the guide elements are located on opposite sides of the camshaft axis.

[0012] In addition, the split cover is secured to the housing with threaded fasteners, while the housing and cover form a single coaxial support channel for the camshaft journal with the required operating clearance.

[0013] In addition, the body is made of aluminum alloy, and the guide elements are made of metal, ensuring dimensional stability and wear resistance during assembly and operation.

[0014] The claimed utility model is illustrated by drawings:

[0015] Fig. 1-3 - general view of the intake camshaft bed assembled and in the spaced position;

[0016] Fig. 4-10 - unit for mutual positioning of the cover and the body and their fastening units;

[0017] Fig. 11-15 - combination of oil channels of the bed and cylinder head, as well as the working area of ​​the camshaft, Teflon sealing rings and oil supply cavity;

[0018] Fig. 16-19 - variants of the bed housing design for various configurations of the oil channels of the cylinder head of the EP6 family, where:

[0019] 1 - body;

[0020] 2 - cover;

[0021] 3 - pins;

[0022] 4 - lid fastener;

[0023] 5 - cylinder head;

[0024] 6 - cylinder head guide bushings;

[0025] 7 - standard means of fastening the housing to the cylinder head;

[0026] 8 - camshaft;

[0027] 9 - Teflon sealing rings;

[0028] 10 - oil supply channel to the camshaft journal;

[0029] 11 - oil supply channel to the phase shifter clutch;

[0030] 12 - oil drain channel;

[0031] 13 - cavity between Teflon sealing rings.

[0032] Fig. 1-3 shows a general view of the utility model in assembly and in an exploded position. The bed includes a housing 1, a detachable cover 2, guide elements 3, a threaded cover fastener 4, standard mounting means 7 on the cylinder head 5, a camshaft 8, Teflon sealing rings 9, and oil channels 10-12.

[0033] Fig. 4-10 shows the fastening assemblies and cross-sections of the fastening and relative positioning zones. In the working version, the guide pins are installed with an interference fit in the cover, and the corresponding mounting holes are made in the housing with a calibrated size sufficient for precise, interference-free assembly.

[0034] Fig. 11-15 shows the alignment of the oil channels of the bed and the cylinder head in versions A and B, as well as the working area of ​​the camshaft, Teflon sealing rings and oil supply cavity.

[0035] Figs. 16-19 show two variants of the bed housing, corresponding to different cylinder head oil channel configurations. Regardless of the design, the general principle of the design remains the same: the housing is a separate, replaceable element, a detachable cover, oil supply and return channels, and a unit for positioning the cover relative to the housing.

[0036] The intake camshaft bed is a separate, replaceable unit consisting of a housing and a split upper cover. It is installed on the top of the EP6 engine's cylinder head and secured with standard fasteners through the provided mounting holes. The housing is equipped with a pair of centering holes for the standard cylinder head guide bushings, ensuring precise positioning of the bed relative to the camshaft axis and the cylinder head lubrication channels.

[0037] The bed housing contains oil channels: an oil supply channel for lubricating the camshaft journal; an oil supply channel into the cavity between two Teflon sealing rings on the camshaft to supply the phase shifter clutch; and an oil drain channel from the said cavity.

[0038] The housing and split cover are additionally equipped with a relative positioning unit, designed in the form of two spaced-apart guide elements and corresponding mating mounting holes, which ensure the centering of the cover relative to the housing until final fastening with threaded fasteners and maintain the alignment of the bearing surfaces formed by the housing and cover. In the preferred embodiment, the guide elements are designed as cylindrical metal pins installed with an interference fit in the cover, and the housing contains mating mounting holes with a calibrated size, ensuring the installation of the pins without interference while maintaining the precise positioning of the cover relative to the housing. Preferably, at least two spaced-apart guide elements are used, located on opposite sides of the camshaft bed axis.

[0039] In the preferred manufacturing embodiment, final machining of the camshaft journal bearing surfaces and / or the mating seating areas of the housing and cover may be performed after the guide elements have been installed and the housing and cover have been assembled.

[0040] The utility model may be implemented in at least two design variants corresponding to different serial configurations of the EP6 family cylinder head, differing in the arrangement of the oil channels. In design A, the oil supply channel to the phase shifter clutch is formed in the bed housing in the form of a single opening located at an angle to the plane of the cylinder head. In design B, the oil supply channel to the phase shifter clutch is formed in the bed housing in the form of two openings located parallel to the plane of the cylinder head. Both designs retain the same geometric and functional features: installation on standard cylinder head guide bushings, fastening with standard fastening means, the presence of the specified oil supply and drain channels, the presence of a detachable cover and a mutual positioning unit by means of guide elements installed with interference fit in the cover, and mating mounting holes made in the housing.

[0041] The utility model can be manufactured using methods of casting, machining, drilling and pressing of guide elements, and enables serial production and use in servicing of EP6 family engines.

Claims

1. A bed for an intake camshaft of an internal combustion engine, comprising a housing with support surfaces for a camshaft journal and a split cover, characterized in that the housing is made as a separate replaceable element for installation on the cylinder head of the engine without modification, is provided with mounting holes for standard fastening means to the cylinder head and a pair of centering holes for standard guide bushings of the cylinder head, wherein an oil supply channel for lubricating the camshaft journal, a channel for supplying oil to the cavity between two Teflon sealing rings on the camshaft for feeding the phase shifter clutch and a channel for draining oil from said cavity are made in the housing, and the housing and the split cover are provided with a mutual positioning unit made in the form of two spaced guide elements and corresponding mating holes.

2. The bed according to paragraph 1, characterized in that the guide elements are made in the form of cylindrical metal pins, installed with tension in a split cover, and the corresponding mounting holes are made in the body with a calibrated size.

3. The bed according to item 1, characterized in that the guide elements are located on different sides of the camshaft axis.

4. The bed according to paragraph 1, characterized in that the detachable cover is secured to the housing with a threaded fastener, wherein the housing and cover form a single coaxial support channel for the camshaft journal with the required working clearance.

5. The bed according to item 1, characterized in that the body is made of an aluminum alloy.

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