Cylinder block with a water jacket and inlet elements

Abstract

A cylinder block includes: a plurality of cylinders; a water jacket through which a coolant flows along an outer periphery of the plurality of cylinders; and introducing members inserted into the water jacket, which are formed at both sides of the plurality of cylinders to separately cool upper and lower portions of the plurality of cylinders, the introducing members restricting a flow of the coolant at a lower side of the water jacket and generating a flow of the coolant at an upper side of the water jacket.

Description

Background(a) Technical FieldThe present disclosure relates to a cylinder block of a vehicle engine, and more specifically, to a cylinder block suitable for implementing a cross flow type coolant flow by having an insertion member in a water jacket.(b) Description of Related ArtGenerally, heat generated in a combustion chamber of an engine is partially absorbed by a cylinder head, a cylinder block, intake and exhaust valves, a piston, and the like. When temperatures of these components are excessively increased, the components are thermally deformed or a defect in lubrication occurs due to damage to an oil film on an inner wall of a cylinder, and therefore a thermal problem occurs.The thermal problem of the engine generates abnormal combustion such as combustion failure and knocking, which generates severe damage such as melting of the piston. In addition, there is a problem that thermal efficiency and engine performance may deteriorate. In contrast, since excessive cooling of the engine generates problems of deterioration of engine performance and fuel efficiency and low temperature shaving of the cylinder, it is necessary to appropriately control a temperature of the coolant.In this aspect, a water jacket is formed in the cylinder block and the cylinder head of the related art engine, and the coolant circulating in the water jacket cools metal surfaces at a periphery of a spark plug corresponding to a combustion chamber, an exhaust port, and a valve seat.However, in the related art engine, the coolant introduced in the order of the cylinders circulates in the water jacket inserted in the cylinder block, and as a result, there is a problem that the cylinder blocks correspond to upper and lower portions of the combustion chamber where a relative temperature difference occurs, which cannot be effectively cooled, so that an overall effect of cooling the engine is inadequate.In particular, the upper portion of the cylinder block that is close to the combustion chamber may be overheated, leading to various problems. Meanwhile, the lower portion of the cylinder block comparatively far from the combustion chamber may be cooled excessively, resulting in an increase in the time required for warming-up.The information disclosed in this Background section above is merely for promoting understanding of the background of the disclosure, and therefore may include information that does not form prior art already known to those skilled in the art.US 2017 / 0 067 411 A1 discloses a water jacket spacer disposed to surround substantially an entire periphery of a portion of the cylinder liner corresponding to the water jacket, wherein an opening through which a coolant introduced from a coolant introduction portion is introduced into an inside of a water jacket spacer is formed in a portion of the water jacket spacer corresponding to the coolant introduction portion. An upper portion of the water jacket spacer is positioned near an outer circumferential wall of the cylinder block. A coolant passage through which the coolant introduced from the opening circulates around an outer periphery of an upper portion of the cylinder liner is formed between the upper portion of the water jacket spacer and the outer periphery of the upper portion of the cylinder liner. A lower portion of the water jacket spacer is positioned near the cylinder liner.US 2018 / 0 363 587 A1 discloses a cylinder bore wall heat insulating device comprising bore wall insulating portions provided for each of the bore walls of cylinder bores and for insulating a wall surface on the cylinder bore side of the groove-like cooling water passage, and a support portion on which the bore wall insulating portions are framed, wherein the bore wall insulating portions include rubber members for covering the wall surface on the cylinder bore side of the groove-like cooling water passage, back surface pressing members provided on the back surface sides of the rubber members and configured to press from the back side of the entire rubber members toward the wall surface on the cylinder bore side of the groove-like cooling water passage, and elastic members urging the back surface pressing members, pushing the rubber members toward the wall surface on the cylinder bore side of the groove-like cooling water passage.SummaryThe present disclosure provides a cylinder block in which upper and lower portions of the cylinder block are separately cooled, thereby minimizing a temperature deviation between the cylinder.The cylinder block according to the invention is defined by independent claim 1. The dependent claims relate to preferred embodiments.The flow restricting portion formed on the frame member of the first insertion member may be formed such that a height of the flow restricting portion increases from a front side to a rear side of the frame member, and the flow restricting portion formed on the frame member of the second insertion member may be formed such that a height of the flow restricting portion increases from the rear side to the front side of the frame member.The thermal insulating members may be formed of a plastic material and may restrict a flow of the coolant by being expanded in volume as a temperature of the coolant increases.A portion of the flow restricting portion that is in contact with the cylinder block may be formed in a lattice shape to minimize friction between the frame member and the cylinder block.The first insertion member may further include a first sealing member that prevents a flow of the coolant from the one side of the water jacket to the other side of the water jacket.The second insertion member may further include a second sealing member that prevents a flow of the coolant from the other side of the water jacket to the one of the water jacket.According to the present disclosure, the insertion members are disposed in the water jacket in the cylinder block, and the flow restricting portions and the thermal insulating members restrict a flow of the coolant at the lower side of the water jacket, thereby providing an environment capable of preventing overheating of the upper portion of the cylinder block by separately cooling the upper and lower portions of the cylinder block and improving a heat insulating performance of the lower portion of the cylinder block.In addition, according to the present disclosure, the flow restricting portion of the frame member is formed with a predetermined gradient, thereby providing an environment suitable for increasing a flow speed of the coolant.In addition, according to the present disclosure, a gradient of the flow restricting portion formed at the one side of the water jacket and a gradient of the flow restricting portion formed at the other side of the water jacket are symmetric, and the coolant flows in a cross flow type, thereby providing an environment suitable for minimizing a temperature deviation between the cylinders in the cylinder block.In addition, according to the present disclosure, the portion of the flow restricting portion of the frame member that is in contact with the cylinder block is formed in a lattice shape, thereby providing an environment suitable for minimizing friction between the frame member and the cylinder block.Brief Description of the FiguresFIG. 1 is a perspective view showing a cylinder block in which an insertion member is inserted into a water jacket according to an exemplary embodiment of the present disclosure. FIG. 2 is a plan view showing the cylinder block of FIG. 1 when viewed from the upper side. FIG. 3 is a cross-sectional view showing a cross-section taken along line A-A of FIG. 2. FIG. 4 is a cross-sectional view showing a cross-section taken along a line B-B of FIG. 2. FIG. 5 is an exploded perspective view of insertion members to be inserted into the water jacket of the cylinder block according to the exemplary embodiments of the present disclosure. FIG. 6 is a side view showing the insertion members of FIG. 5 when viewed from a first insertion member. FIG. 7 is a side view showing the insertion members of FIG. 5 when viewed from a second insertion member.Detailed Description of EmbodimentsIt is understood that the term "vehicle" or "vehicular" or other similar term as used herein is inclusive of motor vehicles in general such as passenger vehicles including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including a variation of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel-powered vehicles (for example, fuels derived from sources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle having two or more sources of power, for example, both gasoline and electric powered vehicles.The terminology used herein is for the purpose of describing specific embodiments and is not intended to be limiting of the disclosure. As used herein, the singular forms "a / an" and "the / s" are intended to include the plural forms as well, unless the context clearly expresses otherwise. It is further understood that the terms "comprises" and / or "comprising," when used in this specification, indicate the presence of characteristics, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other characteristics, integers, steps, operations, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. Throughout the specification, unless expressly stated to the contrary, the word "comprises" and variations such as "comprises" or "comprising" are understood to indicate the presence of stated elements, but not to exclude the presence of any other elements. In addition, the terms "unit", "element", "means", and "module" as used in this specification denote units for processing at least one function and operation, and may be implemented by hardware components or software components and combinations thereof.Further, the control logic of the present disclosure may be implemented as a non-transitory computer readable medium on a computer readable medium having executable program instructions executed by a processor, controller, or the like. Examples of computer readable media include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards, and optical data storage devices. The computer readable medium may also be distributed in network coupled computer systems such that the computer readable medium is stored and executed in a distributed manner, for example, by a telematics server or a controller area network (CAN).In the following detailed description, only certain example embodiments of the present disclosure are shown and explained, simply for purposes of illustration. As those skilled in the art will understand, the described embodiments may be modified in various ways, i.e., without departing from the scope and spirit of the present disclosure.A cylinder block according to an exemplary embodiment of the present disclosure will now be described in detail with reference to FIGS. 1 to 7.FIG. 1 is a perspective view illustrating a cylinder block according to the exemplary embodiments of the present disclosure in which an insertion member is inserted into a water jacket, FIG. 2 is a plan view illustrating the cylinder block of FIG. 1 when viewed from the upper side, FIG. 3 is a cross-sectional view illustrating a cross-section taken along a line A-A in FIG. 2, and FIG. 4 is a cross-sectional view illustrating a cross-section taken along a line B-B in FIG. 2. Referring to FIG. 1, in an engine having a cylinder head and a cylinder block, a cylinder block 100 according to the exemplary embodiments of the present disclosure includes a plurality of cylinders 102 to 108. For example, a first cylinder 102, a second cylinder 104, a third cylinder 106, and a fourth cylinder 108 may be formed in the cylinder block 100.A water jacket 110 through which a coolant flows along an outer periphery of the plurality of cylinders 102 to 108 is formed in the cylinder block 100.Further, in the engine with the cylinder block 100 according to the exemplary embodiments of the present disclosure, the coolant may flow in a cross flow type such that the coolant flows from one side 110 aof the water jacket in an upward direction toward the cylinder head (not shown), passes an exhaust valve side (not shown) and an intake valve side (not shown) of the cylinder head, and then flows to the other side 110 bof the water jacket.Referring to FIGS. 1 and 2, insertion members 120 and 130 inserted into the water jacket at both sides of the plurality of cylinders, respectively, are disposed in the water jacket 110 to separately cool upper and lower portions of the plurality of cylinders 102 to 108.The insertion members 120 and 130 may restrict a flow of the coolant at a lower side of the water jacket 110, but may generate / increase a flow of the coolant at an upper side of the water jacket 110.As shown in FIG. 2, in the cylinder block 100 according to the exemplary embodiments of the present disclosure, a first insertion member 120 is disposed at one side 110 aof the water jacket corresponding to a position of the exhaust valve (not shown), and a second insertion member 130 is disposed at the other side 110 bof the water jacket corresponding to a position of the intake valve (not shown).FIG. 5 is an exploded perspective view of the insertion members to be inserted into the water jacket of the cylinder block according to the exemplary embodiment of the present disclosure.Referring to FIG. 5, according to the exemplary embodiment of the present disclosure, the insertion members 120 and 130 include the first insertion member 120 inserted at one side 110 aof the water jacket and the second insertion member 130 inserted at the other side 110 bof the water jacket.According to the exemplary embodiment of the present disclosure, the first insertion member 120 includes a first frame member 122, first thermal insulating members 124, and a first sealing member 126. Further, according to the exemplary embodiment of the present disclosure, the second insertion member 130 includes a second frame member 132, second thermal insulating members 134, and a second sealing member 136.According to the exemplary embodiment of the present disclosure, the frame members 122 and 132 may be formed of a resin material. Further, according to the exemplary embodiment of the present disclosure, the frame members 122 and 132 include flow restricting portions 122 aand 132 aand flow portions 122 band 132 b.The flow restricting portions 122 aand 132 aare formed at a lower side of the water jacket 110 and have a semicircular shape to surround bores of the plurality of cylinders. Further, the flow restricting portions 122 aand 132 amay be formed with a predetermined gradient from one side to the other side of the frame members 122 and 132.Further, the flow portions 122 band 132 bprotrude from the flow restricting portions 122 aand 132 atoward an upper side of the water jacket 110, and can generate a flow of the coolant in the water jacket.The thermal insulating members 124 and 134 are disposed between the plurality of cylinders 102 to 108 and the frame members 122 and 132, and may be fixed to the flow restricting portions 122 aand 132 a.According to the exemplary embodiments of the present disclosure, the thermal insulating members 124 and 134 are formed of a plastic material and restrict a flow of the coolant by undergoing volume expansion when a temperature of the coolant is increased. The thermal insulating members 124 and 134 may be formed of a material having a higher thermal expansion coefficient than the cylinder block formed of aluminum. The thermal insulating members 124 and 134 come into close contact with bore surfaces of the cylinders by the volume expansion, and the close contact state can be continuously maintained.The seal members 126 and 136 prevent a flow of the coolant between one side 110 aof the water jacket and the other side 110 bof the water jacket. For example, the first sealing member 126 may prevent a flow of the coolant from one side 110 aof the water jacket to the other side 110 bof the water jacket, and the second sealing member 136 may prevent a flow of the coolant from the other side 110 bof the water jacket to one side 110 aof the water jacket.FIG. 6 is a side view showing the insertion members of FIG. 5 when viewed from a first insertion member, and FIG. 7 is a side view showing the insertion members of FIG. 5 when viewed from a second insertion member.Referring to FIG. 6, the first flow restricting portion 122 aformed on the first frame member 122 of the first insertion member 120 is formed such that a height of the first flow restricting portion 122 aincreases from one side (front side) to the other side (rear side) of the first frame member 122. For example, a height x 1 of the first flow restricting portion 122 aat the other side (rear side) of the first frame member 122 may be greater than a height y 1 of the first flow restricting portion 122 aat one side (front side) of the first frame member 122. Further, the first thermal insulating member 124 of the first insertion member 120 may be formed with a size corresponding to the height of the first flow restricting portion 122 a.Referring to FIG. 7, the second flow restricting portion 132 aformed on the second frame member 132 of the second insertion member 130 is formed such that a height of the second flow restricting portion 132 aincreases from the other side (rear side) to one side (front side) of the second frame member 132. For example, a height x 2 of the second flow restricting portion 132 aat one side (front side) of the first frame member 122 may be greater than a height y 2 of the second flow restricting portion 132 aat the other side (rear side) of the first frame member 122. In addition, the second thermal insulating member 134 of the second insertion member 130 may be formed to have a size corresponding to a height of the second flow restricting portion 132 a.Further, portions of the flow restricting portions 122 aand 132 athat are in contact with the cylinder block may be formed in a lattice shape to minimize friction between the frame members and the cylinder block.As described above, in the cylinder block according to the exemplary embodiment of the present disclosure, the insertion members are inserted into the water jacket in the cylinder block, and the flow limiting portions and the thermal insulating members limit a flow of the coolant at the lower side of the water jacket, thereby providing an environment suitable for preventing overheating of the upper portion of the cylinder block by separately cooling the upper and lower portions of the cylinder block, and improving thermal insulation performance of the lower portion of the cylinder block.In addition, in the cylinder block according to the exemplary embodiment of the present disclosure, the flow restricting portion of the frame member is formed with a predetermined gradient, thereby providing an environment suitable for increasing a flow speed of the coolant.In addition, in the cylinder block according to the exemplary embodiment of the present disclosure, a gradient of the flow restricting portion formed at one side of the water jacket and a gradient of the flow restricting portion formed at the other side of the water jacket are symmetric, and the coolant flows in a cross flow type, thereby providing an environment suitable for minimizing a temperature deviation between the cylinders in the cylinder block.In addition, in the cylinder block according to the exemplary embodiment of the present disclosure, the portion of the flow restricting portion of the frame member that is in contact with the cylinder block is formed in a lattice shape, thereby providing an environment suitable for minimizing friction between the frame member and the cylinder block.

Claims

A cylinder block (100) comprising: a plurality of cylinders (102 - 108); a water jacket (110) through which a coolant flows along an outer periphery of the plurality of cylinders (102 - 108); and insertion members (120, 130) inserted into the water jacket (110) formed at both sides of the plurality of cylinders (102 - 108) to separately cool upper and lower portions of the plurality of cylinders (102 - 108), wherein the insertion members (120, 130) restrict a flow of the coolant at a lower side of the water jacket (110) and generate a flow of the coolant at an upper side of the water jacket (110), wherein the insertion members (120, 130) include: a first insertion member (120) inserted at a side (110a) of the water jacket (110); and a second insertion member (130) inserted at another side (110b) of the water jacket (110), wherein the first insertion member (120) and the second insertion member (130) include: frame members (122, 132) including flow restricting portions (122a, 132a) formed at the lower side of the water jacket (110) and having a semicircular shape to surround bores of the plurality of cylinders (102 - 108); Thermal insulating members (124, 134) disposed between the plurality of cylinders (102 - 108) and the frame members (122, 132) and fixed to the flow restricting portions (122a, 132a), and sealing members (126, 136) that prevent a flow of the coolant between the one side (110a) of the water jacket (110) and the other side (110b) of the water jacket, wherein the thermal insulating members (124) of the first insertion member (120) are formed with dimensions corresponding to heights of the flow restricting portions (122a) formed on the frame member (122) of the first insertion member (120); and the thermal insulating members (134) of the second insertion member (130) are formed with dimensions corresponding to heights of the flow restricting portions (132a) formed on the frame member (132) of the second insertion member (130), and the frame members (122, 132) include: flow portions (122b, 132b) protruding from the flow restricting portions (122a, 132a) toward the upper side of the water jacket (110) and generating a flow of the coolant.The cylinder block (100) according to claim 1, wherein: the flow restricting portion (122a) formed on the frame member (122) of the first insertion member (120) is formed such that the height of the flow restricting portion (122a) increases from a front side to a rear side of the frame member (122), and the flow restricting portion (132a) formed on the frame member (132) of the second insertion member (130) is formed such that the height of the flow restricting portion (132a) increases from the rear side to the front side of the frame member (132).The cylinder block (100) according to claim 1 and 2, wherein the thermal insulating members (124, 134) are formed of a plastic material and restrict a flow of the coolant by undergoing volume expansion as a temperature of the coolant increases.The cylinder block (100) according to any one of claims 1 to 3, wherein: a portion of the flow restricting portion (122a, 132a) that is in contact with the cylinder block (100) is formed in a lattice shape to minimize friction between the frame member (122, 132) and the cylinder block (100).The cylinder block (100) according to any one of claims 1 to 4, wherein: the first introduction member (120) further includes a first sealing member (126) that prevents a flow of the coolant from the one side (110a) of the water jacket (110) to the other side (110b) of the water jacket (110).The cylinder block (100) according to any one of claims 1 to 5, wherein: the second introduction member (130) further includes a second sealing member (136) that prevents a flow of the coolant from the other side (110b) of the water jacket (110) to the one side (110a) of the water jacket (110).

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