RU2153587C1 - Internal combustion engine hydraulic valve clearance adjuster - Google Patents

Abstract

FIELD: mechanical engineering; valve timing mechanisms. SUBSTANCE: hydraulic cylinder, spacer spring, plunger with check valve and shell tightly mated with inner surface of housing. Open ring groove is made in shell at side of diaphragm opposite to oil feed hole. Output edge of groove is located lower than hole which forms hydraulic lock and precludes penetration of air. EFFECT: improved serviceability of hydraulic adjuster. 1 dwg

Description

 The invention relates to the field of engine building, and more particularly to gas distribution mechanisms of internal combustion engines.

 A hydraulic device is known for compensating for gaps in the valve mechanism of an internal combustion engine (see, for example, drawing 3105-1007045DS, inv. N 283086), comprising a housing with a base and an oil supply hole, a diaphragm, a movable hydraulic cylinder, an expansion spring, a plunger with a non-return valve.

 During engine operation, the camshaft cam through the base of the housing, plunger, closed volume of oil, a movable hydraulic cylinder acts on the valve. Oil, due to its incompressibility, plays the role of an “elastic” transmission link. According to its specific operation, the engine can be in an idle state for a long time. At the same time, oil from all cavities where it entered during operation is drained into the crankcase, and the free space is filled with air. When the engine starts after a long standstill, the oil entering the device begins to “displace” air from the internal cavity of the housing into the cavity of the plunger pair. This circumstance leads the device to work in shock contact mode in conjunction with a plunger, hydraulic cylinder, which helps to reduce its performance.

 A hydraulic device is known for compensating for gaps in the valve mechanism of an internal combustion engine (see, for example, US Pat. Nos. 4,876,997; oil supply hole, diaphragm with a shell. A plunger with a check valve and a movable hydraulic cylinder, which form a plunger pair, are installed inside the shell. A spacer spring is installed inside the plunger pair, an annular element is tightly mounted on the base of the body, the cylindrical protrusion of which is located coaxially with the outer surface of the shell. Moreover, a channel for supplying oil to the plunger pair is made on the inner surface of the protrusion.

 In this design, when starting the engine after a long stop, for example, for 1.. .2 hours, not all air enters the cavity of the plunger pair from the internal cavity of the housing, but only its part, from the space between the diaphragm and the lower edge of the protrusion, as well as from the channel of the protrusion and the volume located above. Reducing the amount of air entering the plunger pair will lead to a reduction in the operating time of the hydraulic device in shock mechanical contact mode, which can partially improve the operability of the device compared to the previous design. However, this device also did not solve the problem of air entering the plunger pair during engine start-up after prolonged parking.

 The prototype of the invention is a hydraulic device according to US Pat. U.S. N 4876997.

 The objective of the invention is to improve the health and reliability of the hydraulic device.

 To solve the problem in the known hydraulic device for compensating for gaps in the valve mechanism of an internal combustion engine, comprising a housing with an oil supply hole, an annular element with a cylindrical protrusion, a diaphragm, a movable hydraulic cylinder, an expansion spring, a plunger with a non-return valve, a shell is tightly installed on the inner surface of the housing, in which, on the side of the diaphragm, opposite the oil supply hole, an open annular groove is made with an outlet edge located below the passage section Nia openings can thus shroud rigidly mate with the annular element.

 The drawing shows a General view of the proposed hydraulic device.

 The hydraulic device comprises a housing 1 with a base 2 and an oil supply opening 3. A diaphragm 4 with a shell 5 is installed in the housing. A movable hydraulic cylinder 6 and a plunger 7 with a check valve 8 are installed inside the shell 5. The hydraulic cylinder 6 and plunger 7 are spring-loaded with a spacer spring 9 and form a plunger pair . On the base 2 of the housing 1, an annular element 10 is installed with a cylindrical protrusion 11 and a shell 12. The shell 12 is tightly mated with the housing 1. An oil supply channel 13 is made on the inner surface of the protrusion 11. The shell 12 has an open annular groove 14, at which the output edge 15 is located below flow area of the oil supply hole 3.

 The hydraulic device operates as follows.

 During operation of the internal combustion engine, oil from the lubrication system through the hole 3, the annular groove 14, the oil supply channel 13, the check valve 8 enters the internal cavity of the plunger pair. After filling, the check valve 8 closes and blocks the exit of oil from the internal cavity. During the transmission of force, an increase in pressure occurs in the internal cavity. The oil enclosed in a closed volume, due to its practical incompressibility, acts as a rigid link, transferring force through the movable hydraulic cylinder 6 to the valve stem of the gas distribution mechanism. After the engine stops, the oil begins to flow through the oil supply channels into the crankcase. In this case, the internal cavity of the device remains filled with oil. This is due to the fact that the output edge 15 of the annular groove 14, being below the oil supply opening 3, performs the function of a water seal through which air cannot penetrate into the internal cavity of the device.

 Thus, the proposed constructive solution, eliminating the possibility of air entering the internal cavity of the housing, improved the operability and reliability of the hydraulic device to compensate for gaps in the valve mechanism of the internal combustion engine.

Claims (1)

 A hydraulic device for compensating for gaps in the valve mechanism of an internal combustion engine, comprising a housing with an oil supply hole, an annular element with a cylindrical protrusion, a diaphragm, a movable hydraulic cylinder, an expansion spring, a plunger with a non-return valve, characterized in that a shell is tightly installed on the inner surface of the housing, which, on the diaphragm side opposite the oil supply hole, an open annular groove is made with an outlet edge located below the opening section of the hole ment, the shroud can be fixedly mated with the annular element.