RU2179641C1 - Hydraulic tappet - Google Patents

Abstract

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: proposed invention can be used in valve actuating mechanisms of internal combustion engines. Hydraulic tappet has housing I in form of hollow cylinder 2 closed by bottom 4 at one side. Radial channel 22 to feed oil into ring-shaped oil reservoir 11 is made in thin-walled bushing 5 in zone of contact of bushing with bottom of housing in diametrically opposite side relative to longitudinal oil feed channel 19 made on outer cylinder 6 of thin-walled bushing. Channels 22 and 19 are connected by ring line 21 limited by bottom 4 of housing, and ring concentric groove 20 made on inner cylindrical wall 2 of housing close to bottom. Diametrically opposite arrangement of channels 19 and 22 makes it possible to keep maximum amount of oil in ring oil reservoir 11 which feeds central oil space 16 at inclined arrangement of tappet in different position when engine is shut down. EFFECT: improved efficiency and reliability of hydraulic tappets. 2 cl, 3 dwg

Description

 The invention can be used in engine building.

 A hydraulic pusher is known for the valve mechanism of an internal combustion engine, consisting of a cup-shaped housing having an outer wall in the form of a pipe closed at one end with a bottom, in which a sleeve abuts in the inner cavity, passing near the base into an annular washer in the form of a funnel, which in its hole holds the guide in the form of a pipe, in which the hydraulic compensator of the backlash selection moves. In one place on the circumference between the inner wall of the cylindrical part of the housing and the sleeve in the longitudinal direction, an oil-conducting channel is formed, exiting from the oil-supplying hole in the housing wall. The channel at the junction of the cylindrical sleeve into an annular washer is in communication with an annular oil reservoir limited by the bottom of the casing, an annular washer and a hydraulic compensator consisting of an external cylindrical part with a bottom having a piston in its inner bore that abuts the bottom of the casing, while limiting the central oil a cavity divided with a high-pressure chamber by a check valve, and in one place of the contact surface between the piston and the bottom, on the inner surface of the bottom, a recess is provided for transferring oil to the central cavity from the annular oil reservoir. The deepening is made diametrically opposite to the entrance of the oil-conducting channel into the annular oil reservoir. Patent DE 3500 425 C. F 01 L 1/24 01/09/08.

 The said pusher stores the oil in the central oil cavity in the positions around the axis shown in FIGS. 4 and 5 of the known invention, but does not exclude the formation of an air cavity in intermediate positions when the engine is off with the formation of an air cavity. When the engine starts, air from the annular oil reservoir enters the high-pressure chamber, causing the knock of valves.

 The closest in technical essence is a hydraulic pusher in which a concentric annular channel is formed at the point of transition of the cylindrical sleeve into the ring washer, bounded by the inner cylindrical wall and the bottom of the housing. The annular channel is connected to the annular oil reservoir by a recess on the inner surface of the bottom, offset around the circumference relative to the longitudinal oil channel. Patent DE 4343876 A1, cl. F 01 L 1/24 12/22/93.

 The disadvantage of this pusher can be considered that the recess on the inner surface of the bottom of the housing, arbitrarily offset around the circumference, also does not prevent the outflow of oil from the annular oil reservoir of the inclined pusher.

 The purpose of the present invention is to increase the efficiency and reliability of the hydraulic pusher with an inclined axis by maintaining the maximum possible amount of oil in the annular oil reservoir, feeding the Central oil cavity when starting the engine, when the channels leading the oil to the plunger are not yet filled.

 This goal is achieved by the fact that the hydraulic pusher for the valve mechanism of the internal combustion engine contains a housing in the form of a hollow cylinder with an oil supply hole in the wall, closed at one end with a bottom interacting with a camshaft control cam, a thin-walled sleeve fixed in the housing, resting on the bottom of the housing and consisting of an external cylinder with a longitudinal oil supply channel, an internal guide cylinder in which a movable hydraulic compensator is located, and connecting these cylinders are the conical part forming an annular oil reservoir, which is limited by the bottom of the housing and a hydraulic compensator consisting of a cap and a piston with a check valve. Moreover, at the junction of the outer cylinder of the thin-walled sleeve with its conical part in the contact zone with the bottom of the body, a radial channel is formed in the form of a recess connecting the longitudinal oil supply channel with an annular tank through a concentric groove on the inner cylindrical wall of the body near the bottom, forming an annular collector bounded by the bottom case and a thin-walled sleeve, a channel for supplying oil to an annular tank, made in the form of a recess in a thin-walled sleeve, overlapping the line Sleeve-contact with the bottom of the housing is formed at diametrically opposite side with respect to a longitudinal channel in the outer thin-walled cylinder sleeve. The radial and longitudinal channels are connected by an annular collector.

 In FIG. 1 presents the claimed hydraulic pusher in axial section.

 In figure 2, 3 is an axial section of an inclined pusher in various positions around the axis.

 The hydraulic pusher comprises a housing 1 — a hollow cylinder 2 with an oil-supplying hole 3. The cylinder 2 is closed at one end by the bottom 4. A thin-walled sleeve 5 is supported in the housing 1 and is supported on the bottom 4, consisting of an outer cylinder 6, an inner guide cylinder 7, in which moves the hydraulic compensator 8, and connecting the cylinders of the conical part 9 in the form of a truncated cone, facing its smaller base 10 in the direction opposite to the bottom 4. The conical part 9 forms an annular oil cut with the hydraulic compensator 8 and the bottom 4 reservoir 11. The hydraulic compensator 8 consists of a cap 12 and a piston 13 pressed against the bottom 4 by a spring 14. The internal cavities of the cap 12 and the piston 13 form a high pressure chamber 15 communicating through a check ball valve 17 with a central oil cavity 16 bounded by the piston 13 and the bottom 4. To ensure the transfer of oil from the annular oil reservoir 11 to the Central oil cavity 16, in one place around the circumference of the contact surface between the piston 13 and the bottom 4, a recess 18 is provided. On the inner side of the cylinder 2 is made with a concentric groove 20 connecting to the bottom 4, forming, in combination with the bottom 4 and the thin-walled sleeve 5 resting on the bottom 4, an annular manifold 21. A longitudinal channel 19 is made in the outer cylinder 6 of the thin-walled sleeve 5, connected to the oil-supplying hole 3, which exits into the annular manifold 21.

On the opposite side around the circumference of the sleeve 5 in the area adjacent to the bottom 4 at an angle of 180 ^o to the longitudinal channel 19, a radial channel 22 is made connecting the annular manifold 21 with the annular oil reservoir 11.

 The oil supplied to the hole 3 in the cylinder 2 enters through the longitudinal channel 19 into the annular manifold 21, then through the radial channel 22 into the annular oil reservoir 11 and then through the recess 18, made in the bottom 4, into the central oil cavity 16, then through the return ball valve 17 into the high pressure chamber 15.

 In FIG. 2, 3 show axial sections of an inclined hydraulic pusher with a filled annular tank. The effect of preserving oil in the annular oil reservoir of the pusher in its various positions around the axis is realized due to the diametrically opposite arrangement on the thin-walled sleeve 5 of the longitudinal 19 and radial 22 channels interconnected by the collector 21, while the known hydraulic pushers do not have this quality.

Claims (2)

 1. A hydraulic pusher for the valve mechanism of an internal combustion engine, comprising a housing in the form of a hollow cylinder with an oil supply hole in the wall, closed at one end by a bottom interacting with a camshaft control cam, a thin-walled sleeve fixed in the housing, resting on the bottom of the housing and consisting of an outer a cylinder with a longitudinal oil supply channel, an internal guide cylinder in which the movable hydraulic compensator is located, and a conical part connecting these cylinders, a ring-shaped oil reservoir, which is limited by the bottom of the housing and a hydraulic compensator consisting of a cap and a piston with a check valve, while at the junction of the outer cylinder of the thin-walled sleeve with its conical part in the contact zone with the bottom of the housing, a radial channel is formed in the form of a recess connecting the longitudinal oil supply a channel with an annular reservoir through a concentric groove on the inner cylindrical wall of the housing near the bottom, forming an annular collector bounded by the bottom of the housing and t nkostennoy sleeve, characterized in that the channel for supplying oil in the annular reservoir configured as a recess in the thin-walled sleeve, the sleeve overlying the line of contact with the bottom of the housing is formed at diametrically opposite side with respect to a longitudinal channel in the outer thin-walled cylinder sleeve.  2. The hydraulic pusher according to claim 1, characterized in that the radial and longitudinal channels are connected by an annular collector.

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