Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
  • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
  • F01M9/10—Lubrication of valve gear or auxiliaries
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/12—Transmitting gear between valve drive and valve
  • F01L1/18—Rocking arms or levers
  • F01L1/181—Centre pivot rocking arms
  • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/20—Adjusting or compensating clearance
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/02—Valve drive
  • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
  • F01L1/047—Camshafts
  • F01L2001/0476—Camshaft bearings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/02—Valve drive
  • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
  • F01L1/047—Camshafts
  • F01L1/053—Camshafts overhead type
  • F01L2001/0535—Single overhead camshafts [SOHC]
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L2305/00—Valve arrangements comprising rollers
  • F01L2305/02—Mounting of rollers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/24—Cylinder heads

Definitions

• the present invention relates to the field of engines, and in particular to a cylinder head, an engine using the cylinder head, and a method of manufacturing a cylinder head. Background technique
• a first object of the present invention is to overcome the above disadvantages and to provide a compact cylinder head for further miniaturization of the engine.
• the present invention provides the following technical solutions:
• a cylinder head having a top surface, an air intake side surface, an exhaust side surface, a front end surface and a rear end surface, wherein the top surface is provided with a cam shaft mounting seat and a rocker arm mounting mounting boss, the front end There is a through oil passage between the face and the rear end face, and the cylinder head has a support from the rocker arm
• the mounting boss starts a first straight oil hole extending vertically downward and a second straight oil hole horizontally extending from the air intake side, the first straight oil hole is in communication with the second straight oil hole, and The second straight oil hole is in communication with the oil return passage.
• the opening of the second straight oil hole on the side of the intake air is blocked.
• An overhead camshaft engine comprising: a cylinder head as described above; a camshaft mounted in the camshaft mount; a rocker mount mounted on the rocker mount mounting boss, including An intake rocker support pad and an exhaust rocker support pad, the intake rocker support pad and the exhaust rocker support pad are connected by a bridge portion, the intake rocker support pad and the exhaust shake
• the arm support pad is fixedly mounted with an intake rocker arm support and an exhaust rocker arm support;
• the intake rocker arm has a roller driven by the camshaft at one end and a pair of intake valves at the other end, and a rotating shaft in the middle Fixedly mounted on the intake rocker arm support;
• the exhaust rocker arm has a roller driven by the camshaft at one end, and a pair of exhaust valves connected at the other end, and the intermediate shaft is fixedly mounted on the exhaust shaker
• the rocker arm has an oil passage communicating with the first straight
• the rotating shaft of the roller is made of lead brass wire.
• the rotating shaft of the roller is provided with a lubricating oil groove.
• each of the rocker arm supports has two pairs of the intake rocker support pad and the exhaust rocker support pad.
• the cam track of the cam shaft can be approximately tangent to the two straight oil holes, and is approximately tangent to the oblique oil hole.
• the camshaft is closer to the rocker mount mounting boss in the width between the intake side and the exhaust side, and can also be lowered in the height direction, and accordingly, the size of the entire engine can be reduced. , to achieve a more compact layout of the engine, which is conducive to miniaturization.
• the second straight oil hole is blocked by the plugging cover after the processing is completed, which does not affect the performance of the engine, and is blocked by the original plugging process, without adding other equipment or adding force.
• the present invention uses a camshaft to directly contact the roller of the valve rocker arm to drive the intake air.
• the rocker arm and the exhaust valve rocker arm cancel the ejector pin, making the structure more compact and the height can be further reduced.
• the intake rocker arm and the exhaust rocker arm are offset in parallel, which can make the engine The width is as small as possible, which is good for the timing of intake and exhaust.
• the oil passage on the rocker support communicates with the first straight oil hole to provide lubrication for the valve rocker arm and its components, thereby improving engine life.
• the rotating shaft of the roller made of the lead brass wire and the lubricating oil groove on the rotating shaft of the roller all make the rotating shaft and the roller more wear-resistant and prolong the service life.
• two pairs of the intake rocker support pad and the exhaust rocker support pad are disposed on one rocker support, which can further improve the installation precision and ensure the intake and exhaust synchronization between adjacent cylinders.
• a second object of the present invention is to provide a cylinder head which is capable of further miniaturization of the engine and which is capable of manufacturing a single cylinder and having higher precision.
• the present invention provides the following technical solutions:
• a cylinder head having a top surface, a bottom surface, an air intake side surface, an exhaust side surface, a front end surface and a rear end surface, wherein the top surface is provided with a cam shaft mounting seat and a rocker arm mounting mounting boss
• An oil return passage is formed between the front end surface and the rear end surface, and an L-shaped tubular member is cast in the cylinder head, and an opening of an end portion of the vertical portion of the L-shaped tubular member is located at the rocker arm
• a horizontal portion of the L-shaped tubular member is in communication with the oil return passage and a space is formed between an end portion of the horizontal portion and the intake air side.
• a smooth transition is formed between the vertical portion of the L-shaped tubular member and the horizontal portion.
• the outer wall of the L-shaped tubular member has a rib or a pointed protrusion.
• a space between the end of the horizontal portion and the side of the intake side is distributed with a water jacket chamber.
• a method of manufacturing a cylinder head comprising the steps of: pre-burying an L-shaped tubular member in a mold; casting a cast material and cooling, casting the L-shaped tubular member into the cylinder head, and causing the L An opening of the end of the vertical portion of the tubular member is located at the rocker mount mounting boss of the cylinder head, between the end of the horizontal portion of the L-shaped tubular member and the intake side of the cylinder head Having a spacing; machining the return passage to communicate the return passage with a horizontal portion of the L-shaped tubular member.
• machining is performed at the opening of the end of the vertical portion of the L-shaped tubular member, and the L-shaped tubular member and a portion of the cast material are simultaneously cut off, so that the opening is tapered shape.
• the invention pre-embeds the L-shaped tubular member in the casting mold during the casting process of the cylinder head, so that the L-shaped tubular member is cast in the cylinder head to form an oil passage from the rocker arm mounting boss to the oil return passage, without Horizontal drilling and vertical drilling are carried out, which saves the process, makes the processing more simple, and ensures that the oil path is penetrated without considering the influence of the machining accuracy of the drilling. Moreover, there is a space between the end of the horizontal portion of the L-shaped tubular member and the side of the intake air, which not only saves the process of sealing on the side of the intake side, but also provides space for the arrangement of the water jacket of the cylinder head.
• the rounded transition between the vertical portion and the horizontal portion of the L-shaped tubular member not only makes the oil flow more smooth, but also eliminates or weakens the connection between the vertical portion and the horizontal portion of the cylinder head during the casting process. The risk of cracking at the location due to stress concentration.
• the ribs or spikes on the outer wall of the L-shaped tubular member enable the L-shaped tubular member to be more tightly coupled to the cast material.
• a water jacket chamber is distributed between the end portion of the horizontal portion and the air intake side surface, so that the cooling water jacket is distributed in a wider range, which is advantageous for cylinder cooling.
• machining is performed at the opening of the end portion of the vertical portion of the L-shaped tubular member, which can eliminate sarcoma, sticky sand, excess material, etc. near the opening, thereby preventing the lubrication passage from being blocked.
• the oil effect makes the surface of the rocker support mounting boss smoother and ensures the installation accuracy of the rocker support.
• machining is performed at the opening of the end of the vertical portion of the L-shaped tubular member, and the material at the opening of the L-shaped tubular member and the casting material in the vicinity thereof are simultaneously cut off, and the opening is tapered. It can not only eliminate sarcoma, sticky sand, excess materials, etc. near the opening, thus avoiding the lubrication channel being blocked and affecting the oil supply effect, and at the same time making the surface of the rocker support mounting boss smoother, ensuring the installation of the rocker support Accuracy, and eliminates the stress concentration at the opening of the end portion of the cast material and the L-shaped tubular member during the casting process, thereby improving the ability to be stressed.
• a third object of the present invention is to further reduce the processing of the cylinder head while providing a larger space for the arrangement of the cooling water jacket to achieve better cooling efficiency while further miniaturizing the engine. fruit.
• the present invention provides the following technical solutions:
• a cylinder head having a top surface, a bottom surface, an air intake side surface, an exhaust side surface, a front end surface and a rear end surface, wherein the top surface is provided with a cam shaft mounting seat and a rocker arm mounting mounting boss a front oil return passage is formed between the front end surface and the rear end surface, and the cylinder head is integrally cast with a circular arc-shaped tubular member, the circular arc-shaped tubular member is connected to the oil return passage, and the circle One end of the curved tubular member is open on the rocker mount mounting boss, and the center of the arcuate tubular member coincides with the center of the shaft hole of the camshaft mount.
• the spacing position is distributed with a water jacket chamber.
• the outer wall of the circular arc-shaped tubular member has a rib or a pointed protrusion.
• a method for manufacturing a cylinder head comprising the steps of: pre-burying a circular arc-shaped tubular member in a mold; casting a casting material and cooling, so that the circular arc-shaped tubular member is cast in the cylinder head, and One end of the circular arc-shaped tubular member is opened on the rocker arm mounting boss of the cylinder head, and the center of the circular arc-shaped tubular member coincides with the center of the shaft hole of the camshaft mounting seat; And communicating the oil return passage with the arcuate tubular member.
• the opening of the arcuate tubular member is machined.
• the opening of the arcuate tubular member is machined to simultaneously cut off the material at the opening and the casting material in the vicinity thereof to make the opening tapered.
• the invention pre-embeds the circular arc-shaped tubular member in the casting mold during the casting process of the cylinder head, so that the circular arc-shaped tubular member is cast in the cylinder head to form an oil passage from the rocker arm mounting boss to the oil return passage
• the center of the circular arc-shaped tubular member coincides with the center of the shaft hole of the camshaft mount, so that the contour of the entire arc-shaped tubular member can be inclined to be tangent to the cam rotation locus, thereby maximally arranging water.
• the sleeve chamber provides space to increase the cooling effect while achieving further miniaturization of the engine.
• the circular arc shape of the tubular member facilitates the stress distribution between the cast material of the cylinder head and the tubular member without causing stress concentration.
• the arrangement of the water jacket chamber at the interval position can improve the water jacket cooling effect.
• the ribs or cusps on the outer wall of the circular arc-shaped tubular member can make the connection of the circular-arc tubular member to the cast material more compact.
• the opening of the circular arc-shaped tubular member is machined to eliminate sarcoma, sand, excess material, etc. near the opening, thereby preventing the lubricating oil passage from being blocked and affecting the oil supply effect, and simultaneously making the rocker arm
• the surface of the mount mounting boss is smoother, ensuring the mounting accuracy of the rocker mount.
• the opening of the circular arc-shaped tubular member is machined to simultaneously cut off the material at the opening and the casting material in the vicinity thereof, so that the opening is tapered, thereby not only eliminating the sarcoma and the sticky sand near the opening. , excess material, etc., so as to avoid the lubrication channel being blocked and affecting the oil supply effect, and at the same time making the surface of the rocker support mounting boss smoother, ensuring the installation accuracy of the rocker support, and eliminating the casting material during the casting process.
• the stress at the opening of the end of the L-shaped tubular member is concentrated to improve the force.
• FIG. 1 is a plan view of a cylinder head of an overhead camshaft engine
• FIG. 2 is a perspective view of an engine of an embodiment of the present invention, and some components on the engine are omitted;
• Figure 3 is a cross-sectional view taken along line AA of Figure 1, showing a prior art lubricating oil passage structure
• Figure 4 is a cross-sectional view taken along line AA of Figure 1 similar to Figure 3, showing the first embodiment of the present invention Lubricating oil passage structure
• Figure 5 is a schematic view showing the comparison of the structural principle of the lubricating oil passage structure of the first embodiment of the present invention and the prior art lubricating oil passage structure;
• Figure 6 is a perspective view of a rocker arm support of a first embodiment of the present invention.
• Figure 7 is an exploded view of the valve rocker arm of the first embodiment of the present invention.
• Figure 8 is a partial plan view of Figure 2;
• Figure 9 is a view schematically showing a state in which the first straight oil hole and the second straight oil hole are only partially in communication with each other in the first embodiment of the present invention;
• Figure 10 is a front elevational view of an L-shaped tubular member of a second embodiment of the present invention.
• Figure 11 is a cross-sectional view taken along line A-A of Figure 1 similar to Figure 3, showing the lubricating oil passage structure of the second embodiment of the present invention
• Figure 12 is a cross-sectional view taken along line A-A of Figure 1 similar to Figure 3, showing the lubricating oil passage structure of the third embodiment of the present invention
• Figure 13 is a cross-sectional view taken along line A-A of Figure 1 similar to Figure 3, showing the lubricating oil passage structure of the fourth embodiment of the present invention.
• Figure 14 is a front elevational view of a circular arc-shaped tubular member of a fifth embodiment of the present invention.
• Figure 15 is a cross-sectional view taken along line A-A of Figure 1 similar to Figure 3, showing the lubricating oil passage structure of the fifth embodiment of the present invention
• Figure 16 is a schematic view showing the principle of the fifth embodiment of the present invention in comparison with the first embodiment of the present invention.
• the above figure indicates: top surface 1, intake side 2, exhaust side 3, front end 4, rear end 5, camshaft mount 6, rocker mount mounting boss 7, oil return 8, oblique oil hole 9.
• the cylinder head has a top surface 1, an intake side 2 in which an intake port is distributed, an exhaust side 3 in which an exhaust port is distributed, a front end face 4 facing the timing train, and a front end face 4.
• the top surface 1 is relative to the cylinder head and cylinder block
• the bottom surface 215 that is in contact with (not shown) is defined, and the front end surface 4 and the rear end surface 5 are defined relative to the position of the timing train. Of course, other definitions can be employed.
• a camshaft mount 6 is distributed, and a rocker mount mounting boss 7 is distributed in the vicinity thereof.
• the cam shaft 13 is mounted in a shaft hole 61 of the cam shaft mount 6, and the cam shaft 13 drives the intake rocker arm 20 by rotation to drive a pair of intake valves 23, while the cam shaft 13 drives the exhaust rocker arm 21 to drive a pair Exhaust valve 25.
• the oil return passage 8 extends from the front end face 4 to the rear end face 5 so as to penetrate the entire cylinder head between the front and rear end faces as a part of the cylinder lubricating oil passage.
• the processing position of the oil return passage 8 can be selectively small, and is substantially located obliquely below the rocker arm mounting boss 7 near the intake side 2.
• the valve rocker arm (including the intake rocker arm and the exhaust rocker arm) assembly it is generally connected to the oil return by drilling the inclined oil hole 9 from the rocker arm mounting boss 7. Road 8, so that only one drilling is required, and the processing is convenient.
• the present invention is to drill the first straight oil hole 10 vertically downward from the rocker arm mounting boss 7, and then horizontally drill the second straight oil from the air intake side 2.
• the hole 11 , the first oil hole 10 and the second straight oil hole 11 are in communication with each other, and the second straight oil hole 11 is communicated with the oil return passage 8 during processing, so that the oil in the oil return passage 8 can be passed through
• the second straight oil hole 11 and the first straight oil hole 10 reach the rocker arm mounting boss 7 and further enter the valve rocker arm.
• the opening on the intake side 2 needs to be blocked, and the sealing method can be performed by welding or the like, but preferably using pressure.
• Blocking is carried out by plugging the cover, because after the cylinder head is finished, it is generally necessary to block the water hole and the oil hole, so that it can be completed by using existing equipment and existing processes, without being on the production line. Add welding equipment and processes.
• FIG. 5 which schematically shows the advantage of using straight oil holes compared to the inclined oil holes.
• the rotational locus of the cam on the cam shaft 13 is indicated by a circle, and is indicated by a broken line in the case of using the inclined oil hole, and is indicated by a solid line in the case of using the straight oil hole.
• the cam rotation locus represented by the dotted circle at most reaches a position tangent to the oblique oil hole 9 indicated by the broken line (of course, the dotted circle is impossible due to the existence of the hole wall of the inclined oil hole 9 Tangent to the inclined oil hole), the width of the opening of the inclined oil hole 9 reaching the rocker arm mounting boss 7 at the time of the dotted circle is W1, that is, the minimum width of the air intake side 2 of the cylinder head reaching the opening is W1 (do not consider convex Under the premise of the thickness of the axle mount 6, the dashed circle reaches the height of the oil return passage 8 as H1.
• the center C of the dotted circle reaches the center C of the solid circle, and the cam rotation of the solid circle represents the maximum arrival and realization representation.
• the position where the first straight oil hole 10 and the second straight oil hole 11 are tangent (similar to the above case, it is impossible to be truly tangent), so that the intake side 2 of the cylinder head reaches the opening of the first straight oil hole 10.
• the width W2 can be significantly smaller than W1, and the height H2 of the solid circle reaching the return passage 8 can be significantly smaller than HI, that is, in other cases, the same as the use of the inclined oil hole 9,
• the height and width of the cylinder head can be further reduced.
• another reason for achieving a circular shape that is not tangential to the first straight oil hole 10 is that if a tangency occurs, the camshaft will directly press against the shaft of the valve rocker arm and cannot be driven.
• valve rocker arm but this does not hinder the reduction in the width of the cylinder head compared to the use of the inclined oil hole 9, and even the center C of the cam rotation locus is vertically moved downward, although this does not bring the cylinder width
• the reduction but still can bring about a reduction in the cylinder height. That is to say, after the first straight oil hole 10 and the second straight oil hole 11 are used instead of the inclined oil hole 9, the cylinder head can at least achieve a reduction in height, or can simultaneously achieve a reduction in height and width.
• This structure realizes further miniaturization of the engine, and although the solution of the present invention requires two drillings, it can bring a huge advantage in that the weight of the engine is reduced and the space for the entire vehicle is larger, and thus it is cost-effective.
• the rocker arm support 14 includes an intake rocker arm support pad 15 and an exhaust rocker arm support pad 16, and the two support pads are connected by a bridge portion 17.
• An intake rocker arm support 18 and an exhaust rocker arm support 19 are fixedly mounted to the intake rocker support pad 15 and the exhaust rocker support pad 16, respectively.
• the lubricating oil passages inside the valve rocker arms are described in various patent documents and prior art documents, and will not be described in detail herein.
• Each of the intake rocker support pads 15 and one of the exhaust rocker support pads 16 are a pair to provide support for the intake rocker arm 20 and the exhaust rocker arm 21 of the same combustion chamber.
• each of the rocker arm supports 14 has two pairs of intake rocker support pads 15 and exhaust rocker support pads 16, so that one rocker support can be the intake of two adjacent combustion chambers.
• Rocker arm 20 and exhaust rocker arm 21 provide support, this Not only does it bring convenience in installation, but also facilitates the control of the mounting accuracy, and ensures the timing synchronization of the intake rocker arm 20 and the exhaust rocker arm 21 of the adjacent combustion chambers.
• valve rocker arm (including the intake rocker arm 20 and the exhaust rocker arm 21) of the present invention.
• One end of the valve rocker arm has a roller 22, and preferably the shaft 27 of the roller 22 is made of lead brass wire for better wear resistance.
• a lubricating oil groove 28 is also opened on the rotating shaft 27, and the oil from the oil returning passage 8 enters the lubricating oil groove 28 to provide lubrication between the rotating shaft 27 and the roller 22.
• the other end of the valve rocker arm is provided with a valve adjusting bolt 30, and the end of the valve adjusting bolt 30 forms a ball joint with the ball head seat 32.
• the ball head seat 32 presses the valve bridge 33 as the valve rocker arm swings, thereby driving a pair of intake valves 23 or a pair of exhaust valves 25, thereby realizing a drive link between the valve rocker arm and the intake valve or the exhaust valve.
• the installation height of the intake valve 23 and the exhaust valve 25 is regulated by the valve adjusting bolt 30 and is locked by the lock nut 31 after the adjustment is completed.
• a rotating shaft 24 is mounted between the two ends of the valve rocker arm.
• the camshaft 13 When the engine is assembled, the camshaft 13 is mounted into the camshaft mount 6, the rocker mount 14 is mounted to the rocker mount mounting boss 7, and the bolt 29 passes through the rotary shaft 24 to move the intake rocker 20 and the row
• the air rocker arms 21 are fixedly mounted to the intake rocker arm support 18 and the exhaust rocker arm support 19, respectively, and the intake rocker arm 20 and the exhaust rocker arm 21 are swingable about their rotation shafts 24.
• the cam on the camshaft 13 directly contacts the roller 22 to actuate the valve rocker arm.
• the axis a of the rotating shaft of the intake rocker arm 20 is offset in parallel with the axis b of the rotating shaft of the exhaust rocker arm 21. Come and not coincide.
• the first straight oil hole 10 is drilled vertically downward from the rocker arm mounting boss 7, and then the second straight oil hole 11 is horizontally drilled from the air intake side 2,
• the first oil hole 10 and the second straight oil hole 11 are in communication with each other, and the second straight oil hole 11 is communicated with the oil return passage 8 during processing, so that the oil in the oil return passage 8 can pass through the second straight
• the oil hole 11 and the first oil hole 10 reach the rocker arm mounting boss 7 and further enter the valve rocker arm.
• the water jacket chamber 12 cannot be cast in the portion between the oil return passage 8 and the intake side surface 2, or at this position, the water jacket The chamber 12 can only be located below the second straight oil hole 11 to affect the heat dissipation effect of the cylinder head.
• the water jacket chamber cannot be designed at the position of the portion B shown in Fig. 4, because if the water jacket chamber is designed there, At the same time, the oil returning passage 8, the first oil hole 10 and the second straight oil hole 11 must be avoided at the same time, which makes the water jacket setting very complicated.
• the processing time is easy to penetrate the chamber at the B portion to cause oil mixing, so it is actually difficult to achieve, and it is easy to cause an increase in waste.
• the L-shaped tubular member 200 has two portions of a vertical portion 201 and a horizontal portion 202, and an end portion of the vertical portion 201 is labeled as a first end portion 204, a horizontal portion The end of 202 is labeled as a second end 205 and the first end 204 is an open end.
• the L-shaped tubular member 200 is placed as a pre-embedded part in the mold, and then a casting material such as an aluminum alloy, cast iron or the like is cast into the mold, and after the material to be cast is cooled, the L-shaped tubular member 200 serves as a cylinder. A part of the cover is cast in it.
• the outer wall of the L-shaped tubular member 200 has a plurality of ribs 203, and the illustrated ribs 203 are linear, but one of ordinary skill in the art can easily imagine that the ribs 203 It is also possible to have a variety of shapes such as a ring shape, a curved shape, or the like, or a punctiform cusp on the outer wall of the L-shaped tubular member 200, which can achieve a good connection effect.
• the opening of the first end portion 204 is located on the rocker mount mounting boss 7 for the rocker arm support 14 and further to the intake rocker arm. 16 and exhaust rocker arm 18 provide lubrication.
• the oil return passage 8 is formed by machining after the cylinder head is cast, and the horizontal portion 202 is in communication with the oil return passage 8. There is a gap S between the second end 205 and the intake side 2, that is, the horizontal portion 202 has no opening at the intake side 2, and there is no need to block.
• the present invention not only omits the machining process and the plugging process of the two drilling holes, but also the verticality of the L-shaped tubular member 200 while maintaining the miniaturization advantage brought by the straight oil hole instead of the oblique oil hole.
• the portion 201 and the horizontal portion 202 can be ensured to be completely penetrated, and no straight oil hole misalignment occurs, and the weight loss pit can be processed at the position of the interval S, or at the time of casting.
• the water jacket chamber 12 is disposed at the location. In order to obtain a better water jacket cooling effect, it is preferred to arrange the water jacket chamber 12 at the interval S.
• the second end portion 205 just terminates at the oil return passage 8, and one of ordinary skill in the art can readily imagine that the second end portion 205 can continue toward the intake side 2 for reasons of machining accuracy and the like. Extending, but not reaching the intake side 2, correspondingly, the spacing S will decrease.
• the installation accuracy of the intake rocker arm 16 and the exhaust rocker arm 18 may be affected, and the phase accuracy of the intake and exhaust gases may be further affected, and these casting defects may also be partially or Since the openings are all blocked and the oil does not flow smoothly, it is preferable to perform machining at the opening of the first end portion 204, such as drilling, boring, etc., to remove excess materials such as sand and sarcoma at the position. In the present embodiment and the third embodiment, only the excess material at the opening of the first end portion 204 is cut by drilling.
• the material of the L-shaped tubular member 200 is different from the physical properties of the cast material, so that stress concentration is liable to occur at the edges of the sharp transition of the two materials.
• the opening of the first end portion 204 is machined by shaking.
• the arm support mounting boss 7 is tapered, and part of the material at the opening of the first end portion 204 and a portion of the casting material near the opening are simultaneously removed during the processing, so that the machining can be eliminated only by one machining.
• the stress concentration between the L-shaped tubular member 200 and the cylinder head casting material eliminates casting defects such as sticking sand and sarcoma near the opening of the vertical portion of the L-shaped tubular member to ensure the mounting accuracy of the rocker arm mounting boss 7 and The effect of the force performance, and is conducive to the outflow of oil.
• a tapered opening can also be made in the second embodiment of the present invention.
• the arcuate tubular member 300 has a first end 301 and a second end 302, the first end 301 being an open end.
• the circular arc-shaped tubular member 300 is placed in the mold as an embedded member, and then a casting material such as an aluminum alloy, cast iron or the like is cast into the mold. After the casting material is cooled, the arcuate tubular member 300 is cast therein as part of the cylinder head. Due to the entire tube The member 300 has a circular arc shape, so that it is possible to avoid or reduce cracking of the cast material around the circular arc-shaped tubular member 300 due to stress concentration during cooling.
• the outer wall of the circular arc-shaped tubular member 300 has a plurality of ribs 303, and those skilled in the art can easily imagine that the ribs 303 can be annular, curved, etc.
• the shape, or the burr instead of the burr, can achieve a good connection.
• the circular arc-shaped tubular member 300 is cast in the cylinder head to become a part of the cylinder head, and the first end 301 is opened on the rocker arm mounting boss 7.
• the oil return passage 8 is then machined to communicate the arcuate tubular member 300 with the oil return passage 8 to provide lubrication to the rocker arm support 14 and further to the intake rocker arm 16 and the exhaust rocker arm 18.
• the center of the circular arc-shaped tubular member 300 coincides with the center of the shaft hole 61 of the cam shaft mount 6, which is C, so that the portion B in Fig. 5 can be radially away from the center C, in other words, the portion B is in the shape of a circular arc.
• the outer side of the opposite center of the tubular member 300 so that the water jacket chamber 12 can be expanded to the position of the portion B without regard to avoiding the arcuate tubular member, the water jacket chamber being both with the circular arc shaped member 300 during the casting process (or It is said that it is a circular arc-shaped lubricating oil). It is molded together, which reduces the difficulty of design and processing. Further, the center of the circular arc-shaped tubular member 300 coincides with the center of the shaft hole 61 of the camshaft mount 6 to mean that the water jacket chamber can be arranged to the maximum extent by utilizing the existing space, thereby obtaining a good cooling effect.
• the second end 302 just ends at the oil return passage 8 and has a space S between the air intake side surface 2, and the circular arc-shaped tubular member 300 has no opening at the air intake side surface 2, thus omitting
• the plugging process, and, at the position of the interval S, the weight loss pit can be machined, or the water jacket chamber 12 is arranged here during casting. In order to obtain a better water jacket cooling effect, it is preferred to arrange the water jacket chamber 12 at the interval S.
• the second end 302 can continue to extend toward the intake side 2 or even to the intake side 2 for reasons of machining accuracy, etc., but for the above reasons, this is not considered. It is advantageous and therefore not a preferred embodiment of the invention. Casting blanks often have casting defects such as sand sticks and sarcomas, so that some or even all of the openings at the first end 301 are blocked, affecting the flow of oil and affecting the surface smoothness of the mounting brackets of the rocker mounts. In turn, the installation accuracy of the intake rocker arm and the exhaust rocker arm is affected, which affects the gas distribution accuracy.
• the opening of the first end 301 it is preferable to perform cutting machining at the opening of the first end 301, such as drilling, boring, milling, etc., to eliminate casting defects, to ensure that the opening is not closed, and to mount the surface of the boss of the rocker support. Smoother, mention High installation accuracy.
• cutting machining at the opening of the first end 301, such as drilling, boring, milling, etc.
• the material of the circular arc-shaped tubular member 300 is different from the physical properties of the cast material, so that stress concentration is easily generated at the edge of the sharp transition of the two materials, so it is preferable that the first end 301 of the circular arc-shaped tubular member 300 is shaken.
• the opening on the arm support mounting boss 7 is cut into a taper shape, so that the machining of only one cutting machine can eliminate the stress concentration between the arc-shaped tubular member 300 and the cylinder head casting material, and can eliminate Casting defects such as sand and sarcoma near the opening facilitate the outflow of oil and improve the mounting accuracy.
• the principle of the fifth embodiment of the present invention is compared with the first embodiment (or compared with the second to fourth embodiments) to demonstrate the advantages of the embodiment of the present invention.
• all the oil passages in Figure 8 are represented by straight lines or curves.
• the rotational trajectory of the cam on the camshaft 13 (indicated here by the shaft hole 61 instead) tends to be tangent to the lubricating oil passage.
• the oil hole 9 (shown by a broken line) is used as the lubricating oil passage, and the center of the shaft hole 61 of the cam shaft mount 6 (indicated by a broken line at this time) is located at C1.
• the shaft hole 61 of the cam shaft mount 6 (indicated by a solid line at this time)
• the center of the circle can be moved to C2, so that the width (or height, or both) of the cylinder head can be reduced.
• the B portion is replaced by the first straight oil hole 10, the second straight oil hole 11, and the oil.
• the contours of the track 8 and the shaft hole 61 are surrounded by all of the cast material, and it is difficult to arrange the water jacket chamber 12 by this position.
• the circular arc-shaped tubular member 300 is employed, since the lubricating oil passage is a circular arc shape concentric with the shaft hole 61, the circular arc-shaped tubular member 300 is substantially entirely with the shaft hole 61. Tangently, the enclosed space 4 is small, thereby avoiding more space to arrange the water jacket chamber 12, thereby improving the cooling effect of the cylinder head and at the same time achieving miniaturization of the engine.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)
• Valve-Gear Or Valve Arrangements (AREA)
• Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
• Lubrication Of Internal Combustion Engines (AREA)

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• 2013
  • 2013-09-05 RU RU2015149110A patent/RU2629848C2/ru active
  • 2013-09-05 AU AU2013386647A patent/AU2013386647B2/en not_active Ceased
  • 2013-09-05 WO PCT/CN2013/082987 patent/WO2014169553A1/zh active Application Filing
  • 2013-09-05 BR BR112015026313A patent/BR112015026313A2/pt not_active Application Discontinuation
• 2015
  • 2015-10-15 CL CL2015003051A patent/CL2015003051A1/es unknown

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