JP2012211593A - Gasket for valve of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple gasket for a valve of an internal combustion engine having a cost reduction effect.SOLUTION: The gasket (18) includes a tubular support element (26) on an axis (B), and an elastically deformable element (25) installed between a valve (12) and the support element (26). The support element (26) has a first part (42) and a second part (41). The first part (42) is drawn orthogonally to the axis (B), and receives action by a component parallel to the axis (B) for easily installing the gasket (18) to the valve. The second part (41) becomes slender along the axis (B) with the first part (42) as a starting point, and has at least one segment (45) of increasing a radial dimension toward the first part (42) so as to reduce the volume of the elastically deformable element (25).

Description

  The present invention relates to a gasket for a valve of an internal combustion engine.

  An internal combustion engine for a vehicle including a head is known, and the head defines a plurality of combustion chambers and respective cylinders, and a mixture of combustible gas and air in the head. Engine cycles are underway that convert chemical energy in the body into mechanical energy. Further, the head defines an air supply unit and an exhaust unit, and the air supply unit is configured to flow a mixture of combustible gas and air into the combustion chamber, and the exhaust unit is a combustion gas. And air are discharged from the combustion chamber.

  The air supply unit includes a plurality of intake pipes and a plurality of intake valves. The intake pipes supply combustible gas and combustion air to the respective combustion chambers, and the intake valves are supplied to the respective combustion chambers. In order to control the flow of combustible gas and combustion air, each intake pipe is engaged via a respective shutter section and at a predetermined regular time.

  The exhaust unit includes a plurality of pipes and a plurality of exhaust valves, and the pipes exhaust the combustion gas and the combustion air from the respective combustion chambers to the outside air, and the exhaust valve is a combustion gas to each exhaust pipe. In order to control the flow of air and combustion air, each exhaust pipe is engaged via a respective shutter section and at a predetermined regular time.

  Specifically, each intake / exhaust valve generally includes a guide element and a stem, the guide element is mounted in a cavitation made in the head, and the stem is a penetration sheet defined by the guide element. It slides in the opposite direction.

  The aforementioned type of valve is usually fitted with a seal gasket, which is usually for the lubricating oil circulating in the engine and the amount of oil flowing from the intake / exhaust unit to the combustion chamber. Is to control.

  Such gaskets define a dynamic type seal and a static type seal towards the combustion chamber, where the dynamic type seal lubricates the coupling between the stem and the guide element. Only the minimum required flow of oil is allowed, and the static type seal is to prevent a second flow of oil to the combustion chamber.

  Typically, the gasket includes an elastomeric portion pressed against the stem and guide element and a support element attached to the elastomeric portion pressed against the stem and guide element to achieve the aforementioned function.

  More specifically, the first small portion of the inner surface of the elastomer portion cooperates directly with the stem, allowing the minimum flow of oil required to lubricate the coupling between the stem and the guide element. (Dynamic sealing), the aforementioned second small part of the inner surface is arranged between the first small part and the combustion chamber and cooperates with the guide element so that the lubricant leaks into the combustion chamber. Is designed to prevent (static seal).

  In the sector, it is necessary to effectively achieve static and dynamic sealing functions while at the same time ensuring maintenance of the correct positioning of the elastomer part in the operating state. In addition, in the sector, the volume of the elastomer part is required and the gasket needs to be easily attached to the valve.

  It is an object of the present invention to provide a simple and cost effective gasket for a valve of an internal combustion engine that satisfies the aforementioned needs.

  The object of the invention is achieved by a gasket for a valve of an internal combustion engine as defined in claim 1.

  For a better understanding of the present invention, a preferred but non-limiting embodiment will be described with reference to the accompanying drawings.

FIG. 1 is a partial cross-sectional view of an internal combustion engine having a valve gasket made according to the present invention. FIG. 2 is an enlarged longitudinal sectional view of the valve and the seal in FIG.

  In FIG. 1, an internal combustion engine numbered 1 as a whole converts chemical energy contained in fuel into mechanical energy, and only the portion related to the present invention is shown.

  More specifically, in FIG. 1, the internal combustion engine 1 is shown limited to a head 2 that extends symmetrically with respect to the axis A.

  The head 2 defines a combustion chamber 3 (a part of which is shown) and a cylinder 4 (a part of which is shown). A combustible gas is oxidized in the combustion chamber 3 due to the presence of combustion air, and is combustible. The chemical energy contained in the gas is converted into pressure energy, and the axis A of the cylinder 4 is fluidly connected to the combustion chamber 3 to convert the pressure energy into mechanical energy. Yes.

  Further, the head 2 accommodates an air supply unit (not shown) and an exhaust unit 5 so that the air supply unit flows a mixture of combustible gas and combustion air into the combustion chamber 3. The exhaust unit 5 discharges combustion gas and air from the combustion chamber 3 to the outside of the internal combustion engine 1.

  More specifically, the cylinder 4 is provided with a liner 6 and a piston 7, which is slid by the action of fuel pressure inside the liner 6 by reciprocating movement along the axis A, and an engine member (not shown). To convert pressure energy into mechanical energy.

  The combustion chamber 3 is divided in the axial direction by the end wall surface 8, and opens toward the cylinder 4 at a portion facing the end wall surface 8 in the axial direction.

  The end wall surface 8 of the combustion chamber 3 is provided with a pair of circular through-openings (only one of which is numbered and illustrated by reference numeral 9) arranged symmetrically with respect to the axis A. More particularly, an opening not shown allows a mixture of combustible gas and combustion air to pass from the air supply unit into the combustion chamber 3; opening 9 burns the combustion gas and air. It is possible to pass from the chamber 3 to the exhaust unit 5.

  Since the exhaust unit 5 and the air supply unit are completely the same, only the exhaust unit 5 will be described.

  More specifically, the exhaust unit 5 includes an exhaust pipe 11 and a valve 12. The exhaust pipe 11 extends from the opening 9 toward the outside of the internal combustion engine 1, and the valve 12 opens at a predetermined time rule. It engages with the portion 9 to adjust the flow of combustion gas and air from the combustion chamber 3 to the exhaust pipe 11.

  A valve 12 shown in FIG. 2 is accommodated in a seat 14, which is made on the head 2 and usually contains lubricating oil.

  More specifically, the sheet 14 extends symmetrically with respect to the axis B intersecting the axis A and opens at the axial end point 15 with respect to the tube 11.

  More specifically, the valve 12 includes a tubular guide element 16, a stem 17, and a gasket 18. The tubular guide element 16 is inserted inside the end portion 15 of the seat 14, and the stem 17 is a guide. Inside the element 16 is slidably movable in the opposite direction along the axis B, and the gasket 18 coaxially surrounds the stem 17 and the guide element 16 so that oil flows from the seat 14 to the combustion chamber 3. Is to prevent.

  More specifically, the stem 17 protrudes from the guide element 16 in the opposite direction. Furthermore, the stem 17 is provided with a shutter compartment 20 and a compartment 19 at opposite ends in the axial direction, the shutter compartment 20 is adapted to engage the opening 9 in a fluid-tight manner, and the compartment 19 Is adapted to receive a driving force via a control mechanism 21 (illustrated as a cam and tappet type).

  Furthermore, the valve 21 is provided with a spring 22 (illustrated as a spiral type), which spring 22 is attached to the boundary wall surface of the seat 14 and the compartment 19 at the axial ends facing each other, An elastic restoring force is generated on the stem 17 during the reciprocating motion of the stem 17.

  In FIG. 2, the gasket 18 has an annular structure with respect to an axis that coincides with the axis B in the assembled state.

  More specifically, the gasket 18 includes an annular elastomeric element 25 and a support element 26, and the support element 26 is mounted coaxially with the elastomeric element 25, the stem 17 and the guide element 16, and the elastomeric element 25 with respect to the axis B. It is designed to push in the radial direction.

  The elastomeric element 25 defines a dynamic type seal and then a static type seal along the axis B toward the combustion chamber 3, the dynamic type seal being the stem 17 and the guide. The static type seal prevents the second flow of oil into the combustion chamber 3 so as to allow the minimum flow of oil required to lubricate the coupling with the element 16. It is like that.

  More specifically, an elastomeric element 25 is provided with a disk-shaped end section 27 and an axial end section 28 facing each other, an inner circumferential surface 29, and an outer circumferential surface 30, and an inner circle. The peripheral surface 29 is partly adapted to cooperate with the stem 19 and partly cooperates with the guide element 16 in order to form the above-mentioned seal, and the outer circumferential surface 30 connects the inner circumferential surface 29 to the stem 17. And a support element 26 and an annular collar 31 for pressing against the guide element 16.

  In the assembled state, the compartment 27 faces the control mechanism 21 and is traversed by the stem 17; in the assembled state, the compartment 28 faces the combustion chamber 3 and is traversed by the stem 17 and the guide element 16. It is.

  The inner circumferential surface 29 of the elastomeric element 25 is provided with a minimum radius section 33, which section 33 is arranged following the section 27 and is pressed radially against the stem 17 by the collar 31. And defines a circumferential seal line for dynamic type seals, and its compartment 33 allows for a minimum oil leak due to the sliding coupling between the stem 17 and compartment 27.

  The inner circumferential surface 29 of the elastomeric element 25 further comprises a substantially cylindrical part 32, which part 32 is arranged following the compartment 28 and is radiused relative to the fluid-tight guide element 16 by the support element 26. It is intended to be pressed in the direction, thus defining a static type cylindrical seal area.

  The outer circumferential surface 30 of the elastomer element 25 is provided with a recess 36 in the vicinity of the section 27 (the operation of which will be described later). The recess 36 separates the outer circumferential surface 30 from the housing sheet 34 of the collar 36 and the section It is divided into an elongated portion 35 extending towards 28 and adapted to be connected to the support element 26.

  Advantageously, the support element 26 comprises a portion 42 and a portion 41, the portion 42 extends orthogonally to the axis B and facilitates the mounting of the gasket 18 to the valve 12; The portion 41 is subjected to the action of a component parallel to the axis B, has a section 45 extending from the portion 42 along the axis B, and having a radius increasing toward the portion 42. Thus, the volume of the elastomer element 25 is reduced.

  More particularly, the portion 41 is adapted to cooperate with the segment 35 of the elastomeric element 25 and comprises a segment 43 and a segment 44 having a larger radial dimension than the segment 43, the segments 43 and 44 being parts. 41 opposite axial ends are defined.

  The segments 43 and 44 have a cylindrical structure and are connected to a segment 45 having a conical structure.

  In the illustrated example, the segments 43 and 44 extend more in the axial direction B than the segment 45.

  Furthermore, the segment 43 provides a free axial end 46 which is bent towards the axis B so as to hold the elastomeric element 25 in the axial direction.

  The portion 42 is disk-shaped and comprises a small portion 50 housed inside the recess 36 for attaching the support element 26 to the elastomeric element 25; the portion 42 also comprises a small portion 51, The small portion 51 is radially outward with respect to the small portion 50 and is adapted to cooperate axially with the elastomeric element 25 on the side of the compartment 28 and is free on the opposite side in the axial direction. Therefore, it is adapted to the action along the axial direction B in the assembled state.

  The gasket 18 made according to the present invention has the following advantages.

  Specifically, the gasket 18 has two advantages: the segment 45 has a decreasing radial dimension toward the portion 42, so less elastomer material is required and the support element 26 is an elastomer. When attached to the element 25, a force parallel to the axial direction B can be applied to the small portion 51, so that the gasket 18 can be easily assembled to the valve 12.

  In addition, the gasket 18 allows the elastomeric element 25 to be placed in the correct mounting position. This is because the end 46 is bent toward the axis B.

  Obviously, the gasket 18 described and illustrated can be changed and modified without departing from the scope of the claims.

  In particular, the gasket 18 can be used for the suction valve of the air supply unit in exactly the same way.

  Furthermore, the part 42 of the support element 26 is completely free from one or both of the axial segments 43 and 44 and is therefore in a completely inclined pattern with respect to the axis B in the latter case.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Head 3 Combustion chamber 4 Cylinder 12 Valve 18 Gasket 25 Elastically deformable element

Claims (4)

A gasket (18) for a valve (12) of an internal combustion engine (1) comprising:
A tubular support element (26) with respect to the axis (B);
An elastically deformable element (25) adapted to be installed between the valve (12) and the support element (26);
In a gasket (18) comprising:
The support element (26) comprises a first part (42) and a second part (41), the first part (42) extends perpendicular to the axis (B) and to the valve (12). In order to facilitate the mounting of the gasket (18), the second part (41) starts from the first part (42), and is acted upon by a component parallel to the axis (B). As at least one segment (45) extending along said axis (B) and increasing in radial dimension towards said first part (42), said elastically deformable element ( 25) characterized in that the volume is reduced;
gasket.   A first shaft end segment (43) and a second shaft, wherein the second portion (41) is connected to each other by the segment 45 having an increasing radial dimension and extends parallel to the shaft (B). Gasket according to claim 1, characterized in that it comprises an end segment (44).   The support element (26) has an axial end (46), the axial end (46) is opposed to the first part (42) and the elastically deformable element (25) The gasket according to claim 1, wherein the gasket is bent toward the axis (B) so as to be held in an axial direction.   The first part (42) comprises a first small part (50) and a second small part (51), the first small part (50) being attached to the elastically deformable element (25) The second small portion (51) is radially outward with respect to the first small portion (50), and at least a portion of the second small portion (51) is free in the direction of the axis (B). The gasket according to claim 1, wherein the gasket is subjected to the action by the parallel components.

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