Heat management system of IC engine

Abstract

The present invention discloses a heat management system of an IC engine (200) The heat management system comprises an oil passage (240) proximate to intake port(s) (110) of an engine (200) to reduce temperature in intake port(s) (110) region. Oil circulation in the oil passage (240) reduces temperature of an intake air that enters to a cylinder head (100) in suction stroke from intake port (s) (110). Oil flow inside the oil passage (240) is received from a first oil channel (130) inside a stud hole (190a) and the oil flow from the oil passage (240) is further supplied to a second oil channel (140) inside an adjacent opposite stud hole (190b) which further carries oil through jet (160)to cam gallery (210) for lubrication.

Description

HEAT MANAGEMENT SYSTEM OF IC ENGINEFIELD OF INVENTION

[0001] The present invention relates to a heat management system of an internal combustion engine (IC), and more particularly to a heat management system suitable for oil cooling of cylinder head of the IC engine.BACKGROUND

[0002] Long running of IC engine driven vehicles lead to significant increase in the engine’s temperature. The hot environment developed around the engine not only hampers engine’s performance but also causes wear-and-tear of engine’s components. Hence, such engine requires a cooling system for its continuous cooling while in operation. Liquid-cooling or air-cooling are some of the popular heat management techniques for maintaining temperatures of the engine within a safe operating temperature range.

[0003] In an IC engine, the temperature of inlet air entering through intake port has significant impact on engine’s performance. The efficiency of the engine may decrease as the temperature of inlet air increases, making the inlet air thinner. Volumetric efficiency refers to the engine's ability to fill its cylinders with air-fuel mixture during the intake stroke. Cooler air is denser than warmer air, which means it contains more oxygen molecules for a given volume. Hence, intake port cooling is crucial to achieve higher volumetric efficiency of engines. However, it becomes challenging to maintain the intake port at optimum temperatures due to its close proximity to the engine heat being generated during vehicle’s operation.

[0004] Conventional techniques provide a separate oil passage on an intake side to reduce intake air temperatures. However, the oil passage requires an increased width of the cylinder head, thereby increasing the overall dimension of the engine. The increased dimensions of the engine may cause packaging challenges to accommodate the engine on the vehicle. Also, the existing prior arts involve complexities of building separate oil channels for circulating oil to the oil passagefor the intake side cooling. Use of the multiple of such separate oil channels adversely affects strength of the engine. Also, the engine becomes significantly bulky. This further increases the overall cost of the engine.

[0005] Further, a cam gallery of the engine requires a lubrication and decompression unit in close proximity to the cam gallery. In conventional technologies, pressurized lubrication oil is supplied and splashed over the cam gallery through jet. However, in such conventional technologies, a significant amount of the pressurized lubrication oil, directly splashes over the decompression unit, hence adversely affecting functionality of the decompression unit.

[0006] Hence, there is a need for an improved heat management system for the IC engines that solves the above-mentioned problems. Therefore, a more compact, simplified, and effective heat management system with better cooling and lubrication utility is required for the IC engine.OBJECT OF THE INVENTION

[0007] An object of the present invention is to ameliorate the limitations of the existing prior arts by providing a heat management system for an IC engine.

[0008] Another object of the present invention is to provide a heat management system that provides intake port cooling of an IC engine of a vehicle.

[0009] Yet another object of the present invention is to provide an oil passage for engine cooling without increasing any dimensional aspects of the engine.

[0010] Yet another object of the present invention is to provide a heat management system which is simple and compact in construction and provides improved engine cooling efficiency.

[0011] Yet another object of the present invention is to provide an oil passage designed to generate flow and facilitate heat transfer without diminishing oil pressure, thereby preserving the durability of engine components.

[0012] Yet another object of the present invention is to provide an effective lubrication of cam gallery while avoiding direct splash of pressurized oil on thedecompression unit.SUMMARY

[0013] The present invention provides a heat management system for intake port cooling of IC engines in vehicles through an oil passage. The oil passage further supplies oil to a jet for cam gallery lubrication.

[0014] In an exemplary embodiment of the present invention, the heat management system of IC engine, includes a cylinder head including one or more intake ports for intake, one or more exhaust ports for exhaust air removal from engine, a cam gallery including a cam shaft comprising one or more cam lobes for opening and closing the one or more intake ports and the one or more exhaust ports, and a cylinder block includes a plurality of stud bolts secured in a plurality of stud holes for mounting the cylinder head on a top surface of the cylinder block. An oil passage is provided within the cylinder head proximate to the one or more intake ports of the IC engine for cooling of the one or more intake ports during vehicle operation.

[0015] In an exemplary embodiment, oil is supplied to the oil passage from an oil reservoir of the cylinder block through a first oil channel built within one of the stud hole- first stud hole of the cylinder block.

[0016] In an exemplary embodiment of the present invention, a second oil channel carries oil through one of the other stud holes- second stud hole to a top portion of the cylinder head above the one or more intake ports, and the one or more exhaust ports, mounting the cam gallery.

[0017] In an exemplary embodiment of the present invention, the first oil channel and the second oil channel are connected through the oil passage.

[0018] In an exemplary embodiment of the present invention, at the top portion of the cylinder head of the IC engine, a jet is mounted that connects to the second oil channel.

[0019] In an exemplary embodiment of the present invention, the jet splashes the oil received from the second oil channel onto a cam gallery of the IC engine for lubrication.

[0020] In an exemplary embodiment of the present invention, the engine is a single cylinder engine.

[0021] The heat management system may also include features other than those described above. A vehicle including a heat management system as described above forms another embodiment of the present invention. Such vehicles would typically include all types of vehicles such as two wheelers, three wheelers or four wheelers.BRIEF DESCRIPTION OF FIGURES

[0022] The foregoing and other features of this disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several embodiments in accordance with the disclosure and are, therefore, not to be considered limiting of its scope, the disclosure will be described with additional specificity and detail through use of the accompanying drawings, in which:Fig. la is a schematic of an exemplary top view of an engine of a vehicle with representation of cross-sectional plan B-B vertically cut across the engine from top, in accordance with the present invention.Fig. lb is a schematic of an exemplary cross-sectional view of an engine along plan B-B, in accordance with the present invention.Fig. 2a is a schematic of an exemplary top view of a cylinder head of the engine with representation of a cross-sectional plane 0-0 vertically cut across the cylinder head, in accordance with the present invention.Fig. 2b is a schematic of an exemplary cross-sectional view of the cylinder head along plane O-O, in accordance with the present invention.Fig. 3a is a schematic of an exemplary front view of the cylinder head of the engine with representation of cross-sectional plane C-C horizontally cutting across the cylinder head, in accordance with the present invention.Fig. 3b is a schematic of an exemplary cross-sectional view of the cylinder head along plane C-C, in accordance with the present invention.Fig. 4a is a schematic of an exemplary bottom view of the cylinder head of the engine with representation of cross-sectional plane A-A vertically cutting across the cylinder head, in accordance with the present invention.Fig. 4b is a schematic of an exemplary cross-sectional view of the cylinder head along plane C-C, in accordance with the present invention.LIST OF REFERENCE NUMERALS100 - Cylinder Head105 - Cylinder Block105a- Top surface of the Cylinder block110 - Intake Port120 - Exhaust Port130 - First oil channel140 - Second oil channel160 - Jet170 - Cam Chain Chamber180 - Oil Reservoir190a - First stud hole190b - Second stud hole190a, 190b, 190c, 190d - Stud Holes200 - IC Engine210 - Cam Gallery220 - Cam lobe230 - Decompression Unit240 - Oil PassageDETAILED DESCRIPTION

[0023] Embodiments of the present invention are best understood by reference to the figures and description set forth herein. All the aspects of the embodiments described herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit and scope thereof, and the embodiments herein include all such modifications.

[0024] As used herein, the term ‘exemplary’ or ‘illustrative’ means ‘serving as an example, instance, or illustration.’ Any implementation described herein as exemplary or illustrative is not necessarily to be construed as advantageous and / or preferred over other embodiments. Unless the context requires otherwise, throughout the description and the claims, the word ‘comprise’ and variations thereof, such as ‘comprises’ and ‘comprising’ are to be construed in an open, inclusive sense, i.e., as ‘including, but not limited to.’

[0025] The present invention relates to a field of cylinder head cooling for IC engines in automotive vehicles.

[0026] Referring to Fig. la-lb, a heat management system is disclosed for oil cooling of the cylinder head 100 of the IC engine 200. The cylinder head 100 is formed with one or more intake port(s) 110 (illustrated in figure 3b) and one or more exhaust port(s) 120 (illustrated in figure 3b). The cylinder head 100assembled on a top surface 105 a of a cylinder block 105 of the IC engine 200. An oil passage 240 on the cylinder head 100 passes proximate to the intake port(s) 110 of the IC engine 200. An oil reservoir 180 in the cylinder block 105 supplies oil to the oil passage 240 through a first oil channel 130 built within a first stud hole 190a (illustrated in figure 3b). The oil passage 240 further connects to a second oil channel 140 created within a second stud hole 190b at an adjacent opposite end of the cylinder head 100. The second oil channel 140 supplies the oil received, to a jet 160 in the cylinder head 100. A cam gallery 210 is provided in a top portion of the cylinder head 100. The jet 160 splashes the oil received from the second oil channel 140 onto the cam gallery 210 of the IC engine 200.

[0027] Fig. 2a-2b illustrates the cam gallery 210 and a decompression unit 230 provided within a top portion of the cylinder head 100. The cam gallery 210 includes a cam shaft (not shown) operating one or more cam lobe(s) 220 for opening and closing the one or more intake port(s) 110 and the one or more exhaust port(s) 120.

[0028] The jet 160 is mounted on the top portion of the cylinder head 100 adjacent to the decompression unit 230. The jet 160 splashes the oil received from the second oil channel 140 onto the cam gallery 210 of the IC engine 200 for lubrication of the components within the cam gallery 210, i.e. - cam lobes 220 and bearing journals each having an opening for being received on and positioned longitudinally along the camshaft in a predetermined spaced apart relationship.

[0029] The jet 160 location on the cylinder head 100 is such that the oil passage 240 leading to the jet 160 does not interfere with the cylinder head 100 feeding gate design. Also, the oil passage 240 is the shortest passage to lubricate the cam gallery 210.

[0030] Fig. 3a-3b illustrates four stud bolts secured in four stud holes 190a, 190b, 190c, 190d. The cylinder head 100 is assembled on a top surface 105a of the cylinder block 105 of the IC engine 200 through the four stud bolts secured in four stud holes 190a, 190b, 190c, 190d. The cylinder head 100 includes a cam chain chamber 170 to accommodate a drive mechanism operating the camshaft. The firststud hole 190a is located adjacent to the cam chain chamber 170.

[0031] Fig. 4a-4b illustrating the first oil channel 130 that supplies oil to the oil passage 240 for intake port 110 cooling and the second oil channel 140 at an adjacent opposite end of the cylinder head 100 that receives oil from the oil passage 240 to further supply it to the jet 160 mounted at the top portion of the cylinder head 100 for lubrication of the cam gallery 210.

[0032] Hence, Fig. la to 4b of the present invention provides a compact, simplified, and effective heat management system for the IC engine 200. An oil passage 240 is provided on the cylinder head 100 of an IC engine 200 that not only facilitates intake port 110 cooling but also gives an opportunity to incorporate an oil jet 160 for lubricating cam gallery 210 that ensures no direct oil splash with the decompression spring, thereby preventing any potential sluggishness in the operation of spring of decompression unit 230.

[0033] The oil passage 240 is given proximate to intake port(s) 110 of the engine to reduce temperature in intake port 110 region. Hence, the oil passage 240 reduces temperature of intake air that enters to cylinder head 100 in suction stroke from intake port 110. Oil flow inside the oil passage 240 is received from a first oil channel 130 inside a stud hole and the oil flow from the oil passage 240 is further supplied to a second oil channel 140 inside an adjacent opposite stud hole, which further carries oil through the jet 160 to the cam gallery 210 lubrication. The jet 160 location is such that the oil jet passage leading to the jet 160 does not interferes with a cylinder head 100 feeding gate design. Also, the oil jet passage is shortest passage to lubricate the cam gallery 210.

[0034] The heat management system may also include other features than those described above. A vehicle including a heat management system as described above forms another embodiment of the present invention. Such vehicles would typically all type of vehicles such as two wheelers, three wheelers or four wheelers. The engine having such heat management system, typically is a single cylinder engine.

[0035] The heat management system as described hereinabove has technical advantages in terms of providing the heat management system for an IC enginehaving a simple structure, a compact design and cost-effective heat management of engine achieving efficient cooling of intake port(s), effective lubrication of cam gallery, and protection of decompression unit from exposure to pressurized oil splash.

[0036] Although the present invention has been described in terms of certain preferred embodiments, various features of separate embodiments can be combined to form additional embodiments not expressly described. Moreover, other embodiments apparent to those of ordinary skill in the art after reading this disclosure are also within the scope of this invention. Furthermore, not all of the features, aspects and advantages are necessarily required to practice the present invention. Thus, while the above detailed description has shown, described, and pointed out novel features of the invention as applied to various embodiments, it will be understood that various omissions, substitutions, and changes in the form and details of the apparatus or process illustrated may be made by those of ordinary skill in the technology without departing from the spirit of the invention. The inventions may be embodied in other specific forms not explicitly described herein. The embodiments described above are to be considered in all respects as illustrative only and not restrictive in any manner.

Claims

CLAIMSWe Claim:

1. A heat management system of an IC engine (200), comprising: a cylinder head (100) including one or more intake ports (110) for intake, one or more exhaust ports (120) for exhaust air removal from engine, and a cam gallery (210) includes a cam shaft comprising one or more cam lobes (220) for opening and closing the one or more intake ports (110) and the one or more exhaust ports (120), a cylinder block (105) comprising a plurality of stud bolts secured in a plurality of stud holes (190a, 10b, 190c, 190d) for mounting the cylinder head (100) on a top surface (105a) of the cylinder block (105), wherein an oil passage (240) is provided within the cylinder head (100) proximate to the one or more ports (110) of the IC engine (200) for cooling of the one or more intake ports (110) during vehicle operation, and wherein oil is supplied to the oil passage (240) from an oil reservoir (180) of the cylinder block (105) through a first oil channel (130) built within one of the stud holes- of the cylinder block (105).

2. The heat management system as claimed in claim 1 , wherein the first oil channel (130) built within the first stud hole (190a) of the cylinder block (105)3. The heat management system as claimed in claim 1, wherein a second oil channel (140) carries oil through one of the stud holes- to a top portion of the cylinder head (100) above the one or more intake ports (110), and the one or more exhaust ports (120), mounting the cam gallery (210).

4. The heat management system as claimed in claim 3, wherein the second stud hole (190b) carries oil through second stud hole (190b) to the top portion of the cylinder head (100).

5. The heat management system as claimed in claim 2, wherein the first oil channel (130) and the second oil channel (140) are connected through the oil passage (240).

6. The heat management system as claimed in claim 1, wherein at the top portion of the cylinder head (100) of the IC engine (200), a jet (160) is mounted that connects to the second oil channel (140).

7. The heat management system as claimed in claim 1, wherein the jet (160) splashes the oil received from the second oil channel (140) onto a cam gallery (210) of the IC engine (200) for lubrication.

8. The heat management system, as claimed in claim 1, wherein the IC engine (200) is a single cylinder engine.

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