RU2115813C1 - Oil sump of internal combustion engine - Google Patents

Abstract

FIELD: mechanical engineering; base members of internal combustion engines. SUBSTANCE: oil sump secured on cylinder block-and-crankcase unit has bottom and upper parts connected to each other. Bottom part is made of single layer thin sheet metal, and upper part is made of three layer "metal-plastic-metal" material. Direct rigid contact between sump parts can be eliminated by fitting vibration damping member in connecting joint. Sump parts can be connected either in split or non-split manner. EFFECT: reduced noise, improved performance characteristics of automobile. 7 cl, 5 dwg

Description

 The invention relates to engine building, in particular to body parts of an internal combustion engine (ICE). As a rule, the ICE oil sump is made in the form of a single part - cast, absorbing part of the loads, deforming the lower part of the cylinder block (crankcase), and increasing its stiffness, or a light thin-walled all-stamped sheet metal part fixed through a gasket to the crankcase engine and dynamically easily deformable in the area of connection to the mounting area of the crankcase.

 The design of oil pans (MP), which are oil collectors, must satisfy at least two basic requirements: to be a good heat sink on the external surface for cooling the oil and to have a low noise level emitted by the vibrating walls of the sump into the environment (low body sound).

 Known oil pan ICE VA3-2108, V.A. Vershigora et al. Car VA3-2108 M., DOSAAF USSR, 1986, p. 67, fig. 32, pos. 20, which is a single-layer thin-walled, one-piece stamped from a metal sheet part equipped with flanges for fastening to the engine block of the engine. The crankcase has the required heat removal surface area, and engine oil is placed inside its cavity.

 The design of the described oil sump provides a sufficiently efficient heat sink, however, subject to strong vibrations, dynamically deformable, oscillating thin-walled metal sump having a developed surface, is a sufficiently efficient emitter of sound energy into the environment, which is a significant structural disadvantage.

 This disadvantage is partially eliminated in the technical solution described in the application of France 2398887, cl. F 02 F 11/00, published. 03/13/79, where the pallet is attached to the crankcase through special intermediate elastic vibration-isolating elements that partially weaken the dynamic excitation of the walls and accordingly reduce the structural sound emitted by the pallet.

 However, structurally, this is a rather complicated solution that increases the material consumption and product range, while the case sound is not sufficiently suppressed due to the limited vibration-isolating qualities of the elastic elements and the loss of these qualities during operation due to high-temperature and dynamic loads.

 From Japanese application 63-18019, cl. F 02 F 7/00, published. 04/15/88, BI 5- 451, an oil sump made of a composite three-layer metal-plastic-metal (MPM) material is known. Due to the sufficiently high vibration damping properties of carbon filaments and the viscoelastic properties of a plastic layer with a low softening temperature, the energy of vibrations is dissipated and the internal noise of the internal combustion engine is reduced in the medium and high frequencies of the sound spectrum.

 Being effective from the point of view of improving noise and vibration damping qualities, the MPM material is quite expensive to manufacture, it is technologically poorly susceptible to deep drawing (difficulties occur in the production of oil pallets), which increases the amount of rejects in the manufacture of pallets from MPM, and also has poor heat dissipation due to the presence of the material of the plastic layer, which forces either to increase the performance of the oil cooler, or to use additional means for cooling the engine about oil, for example directed forced blowing of the pan.

 Numerous technical solutions are known in which, to one extent or another, both of these problems are simultaneously addressed, in particular, improving the heat removal from the walls of the sump and reducing the vibrational excitation of the walls of the sump and, thus, reducing body noise emitted by the oil sump into the environment. In particular, to reduce vibrational excitation, various stops-dampers and reinforcing elements are used (see German application 4027242, class P 02 B 77/13, published 05.03.92, EPO 0497753, class F 02 F 7/00, published 08/05/92, Japanese application 63-61757, class F 02 F 1/00, published March 17, 88. Either the panel of the pallet is equipped with special stiffeners, as is known from Japanese application 1-247746, class F 02 F 7 / 00, published 0Z. 10.89, or in the aut. St. USSR 1083923 class F 02 F 7/00, published 1984. In the technical decision on the application of Japan 63-2101C, class F 02 B 77/13, published .16.06.80, the bottom of the oil sump is made of two, placed with a gap vibration-isolated from each other by plates (walls).

 However, the described technical solutions are complex and material intensive.

 A device is known to reduce the noise of an oil pan of an internal combustion engine, Japanese application 3-25.330, class. F 02 F 7/00, published. 04/08/91, containing slots made in the side walls of the pallet attached to the lower part of the engine crankcase. In the slots mounted special elastic elements. A distinctive feature of the indicated technical solution is that ribs are made between adjacent slots, elongated from the mounting surface of the pallet to its bottom. This design provides an increase in the bending stiffness of the walls of the pallet and, as a consequence, a decrease in its vibrational activity and body sound.

 A further improvement of the device described above is the technical solution described in Japanese application 3-48338, cl. F 02 B 77/13, published. 07.24.91, in which convex sections are made on elastic elements on both sides of the through holes (slots). In addition, the device contains clamps, which, due to pressure on the lateral surfaces of the elastic elements, press the sections against the lateral edge of the casing. The device is characterized by ease of installation of elastic elements and provides a reliable seal.

 However, even in these technical solutions, vibrations from the mating zone of the engine block crankcase are transmitted insufficiently weakened to the connecting bottom of the oil sump, which directly affects the amplification of the radiation of the body noise.

 As a prototype, the oil pan of the engine block crankcase of the split type described in German application 4242513, class. F 02 F 7/00, published. 06/23/94, made in the form of two interconnected parts, one of which is the bottom of the pallet, and the other is the upper part, through which the pallet is attached to the engine block crankcase. In the plane of the connector, the bottom and upper parts, a cassette oil filter is installed, which, along with its direct function (oil cleaning), also contributes to some damping of vibrations of the pallet structure, which to some extent reduces its vibration activity and body sound.

 However, this technical solution is characterized, to one degree or another, by the design, technological and operational disadvantages already noted above. In particular, this is the increased vibrational excitation of the pallet structure and the transmission of the corresponding structural noise to the environment.

 The objective of the invention is to reduce the noise emitted by the structure of the pallet into the environment, while ensuring effective heat removal from the walls of the crankcase, as well as ensuring simplicity and high technological design.

 The problem is achieved in that in an oil pan containing interconnected bottom and top, hermetically mounted on the end connecting part of the engine block crankcase, the upper part of the pan is made of a three-layer metal-plastic-metal material, and the bottom is made of a single-layer sheet material.

 In this case, the bottom and upper parts of the pallet are mounted with the possibility of no hard contact between each other in the joint joint due to the placement of the ends of the bottom and upper parts of the vibration-damping element in conjunction (for example, gaskets made of oil-resistant rubber).

 With this design, the upper part of the pallet, as the most dynamically loaded, made of MPM composite material (having high vibration damping ability), becomes damped with low body sound, high-tech in manufacturing (since there is no blind and deep drawing operation), which is practically excludes marriage, which is very important, since the material of the MMM is expensive. The bottom of the pan is filled and damped with the oil in it and, in this regard, weakly emits noise. An additional factor contributing to this is the insignificant transmission of vibrations to the bottom from the side of the engine block crankcase, since the upper part from the MPM and the additional vibration damping element installed at the junction of the bottom part with the top significantly reduce the vibration flow transmitted from the engine block to the bottom parts of the crankcase. At the same time, the thin metal sheet from which the bottom part is made and in which the heated engine oil is located, effectively removes heat to the environment, especially when it is deliberately organized by blowing it with a directed air flow, which can be specially provided for at least in cars.

 The bottom and top of the pallet can be mounted detachably (using fasteners, such as screws), or one-piece, for example by rolling, welding, soldering, etc.

 The junction plane of the bottom and top of the pan is placed above the maximum level of engine oil located in the bottom of the pan. The passage section of the upper part of the pallet is made narrower in comparison with the receiving section of the bottom part of the pallet.

 In FIG. 1 shows a portion of a crankcase, an engine on which an oil pan is attached; in FIG. 2 and 3 - one-piece connection of the bottom and upper parts of the oil pan; in FIG. 4 - detachable connection of the bottom and upper parts of the oil pan; in FIG. 5 is a view I in FIG. one.

 The oil pan (Fig. 1) is mounted on the ICE block-crankcase 1 and contains the bottom 2 and the upper part 3. The bottom part 2 of the sump is made of thin-walled single-layer sheet metal, for example 08kp steel. The upper part 3 is made of a three-layer metal-plastic-metal material with a high degree of vibration damping. The pallet is secured to the crankcase 1 through a gasket.

 Direct contact between parts 2 and 3 may be absent due to the placement in their connection of a vibration damping element 4 (Fig. 2-4). The connection of the bottom 2 and the upper parts 3 may be one-piece (Fig. 2 - 3), for example, rolled, or detachable (Fig. 4) using traditional fasteners 5 (bolts, screws, etc.).

 In FIG. 1 shows a preferred embodiment of the proposed technical solution when the joint plane of the bottom 2 and upper 3 parts of the sump is higher than the maximum oil level located in the bottom part 2. In addition, in the joint zone of parts 2 and 3, the passage section of the upper part 3 is made narrower in comparison with the receiving section of the bottom part 2.

 Additionally, in FIG. 5 shows the connecting joint 5 of the bottom 2 and the upper 3 parts of the sump, oil 7 placed in the sump, the sealing gasket 8 securing the sump to the crankcase 1. A fragment of the wall (type I) of the upper part 3 is shown, where on both sides of the plastic layer 9 are placed metal layers 10 and 11. In FIG. 4 there is no direct contact of the elements 2 and 3 through the bolt 5 due to the introduction of additional vibration damping rubber washers 12.

 Dynamic processes during the implementation of working processes in internal combustion engines in the form of gas, unbalanced forces and moments of inertia of the crank mechanism cause dynamic deformation of the engine crankcase 1 of the internal combustion engine with the corresponding excitation and transmission of oscillatory processes and bending dynamic deformations in attached body parts and mounted mounted ICE nodes with the corresponding re-emission of this vibrational energy into the energy of elastic sound waves radiated into the environment in the form of a body sound is schegosya undesired noise pollution.

 In the proposed oil sump, a significant part of the vibrational energy is converted into heat, and not sound, due to the effective damping of the vibration stream from the crankcase 1, first the upper part 3 of the sump, which is made of high-performance noise vibration damping material MPM, then the vibration damping element 4, which it interrupts the flow of vibrations due to the exclusion of direct contact of the upper part 3 with the bottom part 2. The latter is slightly susceptible to vibration, since the oil located inside the bottom part 2 is at the same time It performs the function of vibration damping. At the same time, the bottom part 2, made of a thin metal sheet, effectively removes heat from its walls.

 The connection of parts 2 and 3 can be very different, some options are shown in Fig.2-4.

 Placing the joint 6 above the oil level and the passage section of the upper part 3 narrowed in comparison with the receiving section of the bottom part 2 will eliminate possible oil leakage through the joint 6.

 Thus, the use of a structurally simple and high-tech technical solution allows you to effectively solve simultaneously two problems in the engine industry, namely, reducing the noise of the car and improving its performance by providing efficient heat dissipation from elements that need forced cooling.

Claims (7)

 1. An oil pan containing hermetically connected to each other the bottom and top parts, hermetically mounted on the end connecting part of the crankcase of the internal combustion engine, characterized in that the upper part of the pan is made of a three-layer metal-plastic-metal material, and the bottom part is made of single layer sheet metal.  2. The pallet according to claim 1, characterized in that the bottom and upper part of the pallet are mounted so that there is no hard contact between them in the connecting junction.  3. The pallet according to claims 1 and 2, characterized in that in the conjugation of the ends of the bottom and upper parts there is a vibration damping element.  4. The pallet according to paragraphs. 1 to 3, characterized in that the bottom and upper parts are mounted in one piece.  5. The pallet according to paragraphs. 1 to 3, characterized in that the bottom and upper parts are mounted detachably.  6. The pallet according to claims 1 to 5, characterized in that the junction plane of the bottom and top of the pan is placed above the maximum oil level located in the bottom of the pan.  7. The pallet according to claims 1 to 6, characterized in that the passage section of the upper part of the pallet is made narrower in comparison with the receiving section of the bottom part of the pallet.

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