CN114320646A

CN114320646A - Cylinder cover assembly and assembly method thereof, and thermodynamic single cylinder engine

Info

Publication number: CN114320646A
Application number: CN202111677295.2A
Authority: CN
Inventors: 张继杨; 蔡文新; 何勇; 卢炼; 章聂
Original assignee: Dongfeng Motor Group Co Ltd
Current assignee: Dongfeng Motor Group Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-04-12
Anticipated expiration: 2041-12-31
Also published as: CN114320646B

Abstract

The invention discloses a cylinder cover assembly, an assembly method thereof and a thermodynamic single cylinder machine, and solves the technical problems that the conventional single cylinder machine is high in test cost, only suitable for development of a new machine type and not suitable for technical upgrading of a mass-production machine type. The cylinder head assembly provided by the invention comprises a cylinder head and a cover plate, wherein the cylinder head has all functional structures of an engine cylinder head. The cylinder head and the cover plate are arranged side by side along the cylinder arrangement direction of the cylinder block, and the cover plate is used for sealing other cylinders of the cylinder block of the multi-cylinder engine. Therefore, after the cylinder cover is assembled with a cylinder body of a mass-production multi-cylinder engine, a novel engine system can be obtained, the formed thermodynamic single-cylinder engine has the advantages of rapidness, low cost, easiness in adjustment and the like of the thermodynamic single-cylinder engine, the existing prototype boundary and the test tool of the mass-production multi-cylinder engine can be utilized, and the optimal technical effects of the aspects of cost, period, test effect and the like are finally achieved.

Description

Cylinder cover assembly and assembly method thereof, and thermodynamic single cylinder engine

Technical Field

The application belongs to the technical field of engines, and particularly relates to a cylinder cover assembly and an assembly method thereof, and a thermodynamic single cylinder engine.

Background

As national emission and fuel consumption regulations continue to tighten and in response to the rapid demands of the automotive market, the cycle of engine development and technology upgrade continues to be compressed. The performance development of the traditional engine is generally to make various combustion system optimization schemes, a large number of tests and comparisons are carried out on an engine test bed, and the final configuration scheme of the engine is determined according to test results. The method has high development cost and long period, and is often difficult to obtain an ideal optimal configuration scheme in the prediction stage of a new product scheme, and the reliability and the accuracy of the prediction scheme are low. The single-cylinder testing machine has the same structure and working principle as the multi-cylinder machine, and the single-cylinder machine has low manufacturing and testing cost and is easy to adjust; therefore, the single-cylinder engine development and research has very important significance for reducing the development cost of the engine, shortening the development period and carrying out high-performance product research.

The existing single cylinder engine is to trial-manufacture a whole set of special parts for the single cylinder engine according to the definition of the part technology, a special bench test tool needs to be prepared, and the subsequent test needs to be carried out on a special thermodynamic single cylinder engine bench. Therefore, the single-cylinder engine test in the prior art needs to invest in large parts, work trial-manufacturing cost and a special test bench, is only suitable for development of all new models, and cannot be suitable for technical upgrading of mass-production models.

Disclosure of Invention

In order to solve the technical problems, the invention provides a cylinder cover assembly, an assembly method thereof and a thermodynamic single cylinder engine, which can adopt a test bench of the existing mass production type and reduce the research and development cost.

The technical scheme adopted for realizing the aim of the invention is that the cylinder cover is formed and is adapted to a cylinder body of a multi-cylinder engine; the cylinder cover assembly comprises a cylinder cover and a cover plate which are arranged side by side along the arrangement direction of cylinders of the cylinder block, a first butt joint structure and a second butt joint structure which are matched with each other are respectively arranged at the butt joint ends of the cylinder cover and the cover plate, the cylinder cover and the cover plate are positioned through the first butt joint structure and the second butt joint structure, and the cylinder cover and the cover plate are fixedly connected through threaded fasteners.

Optionally, the first butt joint structure and the second butt joint structure are both provided with pin holes, and positioning pins are inserted into the pin holes;

or, the first butt joint structure is provided with a positioning hole, the second butt joint structure is correspondingly provided with a positioning column, and the positioning column is inserted into the positioning hole.

Optionally, the first butt joint structure is a step structure, and the second butt joint structure is an inverted step structure.

Optionally, the step structure is in clearance fit with the butt joint surface of the inverted step structure; a chamfer is arranged at the edge of the step structure and/or the corner between the surface layer and the side surface; a chamfer is arranged at the edge of the inverted ladder structure and/or the folding angle between the surface layer and the side surface;

the positioning pin/positioning column is in clearance fit with the pin hole/positioning hole; the length of the positioning pin/positioning column is smaller than the total depth of the pin hole/positioning hole.

Optionally, the gap between the step structure and the surface layer of the inverted step structure is 0.2-0.4 mm; the side gap between the step structure and the inverted step structure is 0.2-0.5 mm; and an aluminum repairing agent is filled in a gap between the butt joint end of the cylinder cover and the butt joint end of the cover plate.

Optionally, a connection side plate is arranged at the butt joint end of the cover plate, and the cylinder cover is fixedly connected with the connection side plate through the threaded fastener.

Optionally, the cover plate is provided with a raised ridge extending along the arrangement direction of the cylinders, and the connecting side plate is connected to the raised ridge; the end face of the connecting side plate protrudes out of the end face of the butt joint end of the cover plate.

Optionally, more than 3 leveling threaded holes for installing leveling bolts are arranged on the end surface, far away from the assembly sealing surface, of the raised ridge.

Based on the same inventive concept, the application also provides an assembling method suitable for the cylinder cover assembly, which comprises the following steps:

securing the cylinder head and the cover plate with a cylinder block to pre-position the cylinder head and the cover plate;

determining the circle center position of the pin hole of the cylinder cover and marking a circle center point according to the pin hole of the cover plate, machining the pin hole of the cylinder cover according to the circle center point, and ensuring that the deviation between the pin hole of the cylinder cover and the center line of the pin hole of the cover plate is less than 0.10 mm;

determining the circle center position of the threaded hole of the cylinder cover and marking a circle center point according to a fixed threaded hole on a connecting side plate of the cover plate, processing the threaded hole of the cylinder cover according to the circle center point, and ensuring that the deviation of the center line of the threaded hole of the cylinder cover and the fixed threaded hole of the cover plate is less than 0.10 mm;

inserting the positioning pins into pin holes of the cylinder head and pin holes of the cover plate, and screwing the threaded fasteners into threaded holes of the cylinder head and fixing threaded holes of the cover plate so that the cylinder head and the cover plate form a combined body; removing the complex from the cylinder block;

mounting the leveling bolts on the cover plate, placing the combined body on a plane in a posture that an assembly sealing surface faces upwards, and adjusting the screwing amount of each leveling bolt and/or the threaded fastener by taking the assembly sealing surface of the cylinder cover as a horizontal reference so that the horizontal inclination amount of the assembly sealing surface of the cover plate is less than 0.04 mm;

and filling an aluminum repairing agent in a gap between the butt joint end of the cylinder cover and the butt joint end of the cover plate, and bonding and fixing the cylinder cover and the cover plate after the aluminum repairing agent is cured to form the cylinder cover.

Based on the same inventive concept, the application also provides a thermodynamic single cylinder engine, which comprises:

a cylinder block;

the cylinder head assembly is connected to the cylinder block, a cylinder head of the cylinder head assembly covers a first cylinder of the cylinder block, and a cover plate of the cylinder head assembly covers other cylinders of the cylinder block;

and the cylinder gasket is arranged between the cylinder block and the cylinder cover assembly so as to seal an assembly sealing surface formed by the cylinder block and the cylinder cover.

According to the technical scheme, the cylinder cover comprises the cylinder cover and the cover plate, wherein the cylinder cover has all functional structures of an engine cylinder cover. According to the test requirements, the cylinder cover can adopt a single-cylinder cover, a double-cylinder cover, a three-cylinder cover and the like. The cylinder head and the cover plate are arranged side by side along the cylinder arrangement direction of the cylinder block, and the cover plate is used for sealing other cylinders of the cylinder block of the multi-cylinder engine. Therefore, after the cylinder cover is assembled with a cylinder body of a mass-production multi-cylinder engine, a novel engine system can be obtained, the formed thermodynamic single-cylinder engine has the advantages of rapidness, low cost, easiness in adjustment and the like of the thermodynamic single-cylinder engine, the existing prototype boundary and the test tool of the mass-production multi-cylinder engine can be utilized, and the optimal technical effects of the aspects of cost, period, test effect and the like are finally achieved.

According to the novel engine system, the cylinder head and the cylinder block of the mass-production multi-cylinder engine are assembled by using the mass-production cylinder gasket, and the structure of the cylinder head is different from that of the cylinder head of the mass-production multi-cylinder engine, so that the problems that the fastening connection and the sealing between the cylinder head and the multi-cylinder block become the reliability of the novel engine system, and if the cylinder gasket is sealed and fails, the cooling liquid in the water jacket of the cylinder block leaks to the oil pan to cause oil-water mixing are solved. In the cylinder head of this application is constituteed, the butt joint end of cylinder head and apron is equipped with first butt joint structure of matched with and second butt joint structure respectively, and the cylinder head passes through first butt joint structure and second butt joint structure location with the apron, and the cylinder head passes through threaded fastener with the apron and is connected fixedly, through the location and the fixed connection of cylinder head and apron for the cylinder head forms the complex body with the apron, and the assembly sealing face satisfies the plane degree requirement, can seal well with the cylinder block.

Drawings

Fig. 1 is a schematic structural view of a cylinder head assembly in embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of a cylinder head in the cylinder head assembly of fig. 1.

Fig. 3 is a cross-sectional view of a first docking structure in the cylinder head of fig. 2.

Fig. 4 is a schematic structural view of a cover plate in the cylinder head assembly of fig. 1.

Fig. 5 is a cross-sectional view of a second mating structure in the cover plate of fig. 4.

Fig. 6 is a cross-sectional view of the cylinder head assembly of fig. 1 with the first and second mating structures in an assembled state.

Fig. 7 is a schematic structural view of a leveling process of a cylinder head assembly in embodiment 2 of the present invention.

Fig. 8 is a front view of fig. 7.

Fig. 9 is a schematic structural view of a thermodynamic single cylinder engine in embodiment 3 of the present invention.

FIG. 10 is a block diagram of the assembly of the cylinder block and cylinder head of the thermodynamic single cylinder engine of FIG. 9.

Description of reference numerals:

1100-cylinder head assembly; 100-cylinder cover, 101-assembly sealing surface of the cylinder cover, 110-step structure, 111-upper edge of the step structure, 112-bevel of surface layer and side surface, 113-lower edge of the step structure; 200-cover plate, 201-assembly sealing surface of cover plate, 210-connecting side plate, 211-fixing threaded hole, 220-raised ridge, 221-leveling threaded hole, 222-threaded hole, 230-inverted ladder structure, 231-pin hole, 232-upper edge of inverted ladder structure, 233-lower edge of inverted ladder structure; 1-a stud; 2-a nut; 3-positioning pins; 4-aluminum healant; 5-storing the glue and chamfering; 6-clearance; 7-leveling bolt.

1000-thermodynamic single cylinder engine; 100-a cylinder head; 200-a cover plate; 300-a cylinder block; 400-a generator; 500-air conditioning compressor; 600-a cooling system; 700-lubrication system.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.

In the related technology, a whole set of special parts for the single cylinder engine are trial-manufactured according to the definition of the part technology, a special bench test tool needs to be prepared, and the subsequent test needs to be carried out on a special thermodynamic single cylinder engine bench. For the technical upgrading of mass-produced models, the improvement of local systems such as a combustion system and the like is mainly related, other structures and systems continue to use the original models, and if the single-cylinder engine is input, parts and boundaries of the original models cannot be greatly utilized, so that the problems of high part test cost and long test preparation period exist. And the difference of the single-cylinder engine and the multi-cylinder engine on cooling and lubricating systems causes certain difference of test precision. Therefore, the technology upgrading of the existing mass production model is lack of test tools and difficult to upgrade.

In order to solve the problems of the related art, the embodiment of the application provides a cylinder cover composition, an assembly method thereof and a thermodynamic single cylinder machine, parts, boundaries and a test bench of the existing mass production type can be adopted, and the cylinder cover composition, the boundary and the test bench are not only used as a single cylinder testing machine, but also can be used for technical upgrading of mass production type.

The technical scheme of the application is defined in detail by combining the following specific embodiments:

example 1:

an embodiment of the present invention provides a cylinder head assembly 1100, and the cylinder head assembly 1100 is adapted to a cylinder block of a multi-cylinder engine, that is, the cylinder head assembly 1100 can be adapted to a cylinder block of a two-cylinder engine, a cylinder block of a three-cylinder engine, a cylinder block of a four-cylinder engine, or a multi-cylinder engine with other cylinder numbers. Referring to fig. 1, the cylinder head assembly 1100 mainly includes two parts, i.e., a cylinder head 100 and a cover plate 200, the cylinder head 100 and the cover plate 200 are arranged side by side along a cylinder arrangement direction of a cylinder block and are respectively used for covering different cylinders of the cylinder block, and the cylinder head 100 and the cover plate 200 are respectively provided with a cylinder head bolt through hole for connecting and fixing with the cylinder block through a bolt. According to specific requirements, the cylinder cover 100 can be a single-cylinder cover, a double-cylinder cover, a three-cylinder cover and the like, and the requirement that the number of covered cylinders of the cylinder cover 100 is less than the total number of cylinders of an engine is met.

In order to meet the assembly sealing requirement of the cylinder head assembly 1100, a first butt joint structure and a second butt joint structure which are matched with each other are respectively arranged at the butt joint end of the cylinder head 100 and the butt joint end of the cover plate 200, the cylinder head 100 and the cover plate 200 are positioned through the first butt joint structure and the second butt joint structure, and the first butt joint structure and the second butt joint structure are used for realizing the assembly positioning of the cylinder head 100 and the cover plate 200. The cylinder head 100 and the cover plate 200 are fastened and fixed by a screw fastener, and the screw fastener for fastening and fixing may be provided in the butt structure or in another position of the cylinder head 100 and the cover plate 200. First butt joint structure and second butt joint structure can adopt location structure such as tooth meshing, mortise and tenon joint, step location, and specific structural style this application does not do the restriction.

Referring to fig. 2 to 6, in the present embodiment, the first docking structure and the second docking structure employ a pin positioning structure. Specifically, the pin holes 231 can be formed in the first butt joint structure and the second butt joint structure, and the positioning pins 3 are inserted into the two communicated pin holes 231, so that positioning is achieved. In other embodiments, a positioning hole may be disposed on the first docking structure or the second docking structure, a positioning post is correspondingly disposed on the second docking structure or the first docking structure, and the positioning post is inserted into the positioning hole during assembly, so as to achieve positioning.

In order to simplify the structure, the first butt joint structure and the second butt joint structure adopt a step positioning structure. Referring to fig. 3 and 5, the first docking structure is a step structure 110, the second docking structure is an inverted step structure 230, that is, the second docking structure is an inverted step structure, the step height of the step structure 110 is 10mm ± 1mm, and the step width is 9.5mm ± 0.5 mm. In this embodiment, the step structure 110 and the inverted step structure 230 are both provided with pin holes 231, and the number of the pin holes 231 is 2-4.

In order to ensure good working condition of the engine, the cylinder body and the cylinder cover need to be ensured to have excellent sealing performance. In order to improve the sealing performance, in this embodiment, the step structure 110 is in clearance fit with the abutting surface (including the step surface layer and the step side surface) of the inverted step structure 230, and the gap 6 is sealed by a filler. Specifically, the surface layer gap between the step structure 110 and the inverted step structure 230 is 0.2-0.4 mm; the side gap 6 between the step structure 110 and the inverted step structure 230 is 0.2-0.5 mm, and the gap 6 can ensure smooth filling of fillers and avoid the reduction of the connection strength between the cylinder cover 100 and the cover plate 200 caused by the overlarge gap. By adding the filler into the gap 6, the good sealing of the joint surface of the first joint structure and the second joint structure can be realized, the filler can be a material commonly used in the sealing field, and the aluminum repairing agent 4 is adopted in the embodiment.

Since there is a flow resistance at the edges and corners of the steps, in order to facilitate the filling operation of the filler and store the filler as much as possible, in this embodiment, a chamfer is provided at the edges and/or corners of the surface layer and the side surface of the stepped structure 110, and a chamfer is provided at the edges and/or corners of the surface layer and the side surface of the inverted stepped structure 230. The chamfer can be an oblique angle chamfer or a circular arc chamfer, and the application is not limited. Specifically, in this embodiment, a 1mm × 45 ° chamfer is provided at the upper edge 111 of the stepped structure 110 and the corner 112 between the surface layer and the side surface, and a 1.5mm × 30 ° chamfer is provided at the lower edge 113 (close to the assembly sealing surface) of the stepped structure 110; the upper edge 232 of the inverted step structure 230 is provided with a 1.25mm x 45 ° chamfer, and the lower edge 233 (near the assembly sealing surface) is provided with a 1.5mm x 30 ° chamfer.

To further improve the sealing performance, in some embodiments, the length of the positioning pin 3/positioning post may be set to be smaller than the total depth of the pin hole 231/positioning hole, so that at least one end of the positioning pin 3/positioning post is embedded in the pin hole 231/positioning hole, and the gap between the pin shaft and the hole can be sealed by the filler.

In order to ensure the structural strength of the first and second docking structures, in the present embodiment, the cylinder head 100 and the cover plate 200 are fixedly connected by the threaded fasteners, and the threaded fasteners for fixedly connecting the cylinder head 100 and the cover plate 200 are disposed at other positions of the cylinder head 100 and the cover plate 200. Referring to fig. 1, 2 and 4 in particular, the butt end of the cover plate 200 is provided with a connection side plate 210, and the cylinder head 100 is fixedly connected to the connection side plate 210 by a threaded fastener, which may be a screw, a bolt, a stud bolt or other fasteners. In order to further improve the sealing effect, the end face of the connecting side plate 210 protrudes from the end face of the butt end of the cover plate 200, that is, the end face of the connecting side plate 210 close to the cylinder head 100 protrudes from the step side face of the outermost end of the cover plate 200, so that a stable gap is maintained between the step side face of the outermost end of the cover plate 200 and the step side face of the corresponding position of the cylinder head 100, and fillers are contained.

In order to improve the structural strength of the connecting side plate 210, the upper surface of the cover plate 200 is provided with a convex ridge 220 extending along the cylinder arrangement direction, the connecting side plate 210 is connected to the end of the convex ridge 220, the convex ridge 220 strengthens the connecting side plate 210 on one hand, on the other hand, the convex ridge 220 can also be used as the mounting base of external structural members, for example, more than 3 leveling bolts 7 are arranged on the end surface of the convex ridge 220 far away from the assembly sealing surface, and the leveling bolts 7 can level the cylinder head 100 and the cover plate 200 during assembly, thereby ensuring the flatness of the assembly sealing surface of the cylinder head assembly 1100. The end face of the ridge 220 remote from the mating sealing surface is provided with a threaded hole 222 for mounting other accessories of the engine.

Referring to fig. 4, in the present embodiment, two convex ridges 220 are disposed on the upper surface of the cover plate 200, and the two convex ridges 220 extend along the cylinder arrangement direction and are symmetrically distributed. Two ridges 220 are respectively provided with 2 leveling threaded holes 221, the 2 leveling threaded holes 221 have a larger distance, the distance is larger than 100mm, for example 115mm, and the larger distance ensures the flatness of the cover plate 200 and the bottom surface of the cylinder cover 100 in the leveling process. The two ridges 220 are also provided with 3 threaded holes 222 for mounting other accessories of the engine.

Example 2:

the present embodiment provides an assembling method of a cylinder head assembly 1100 for assembling the cylinder head assembly 1100 of embodiment 1 described above. Referring to fig. 7 to 9, the assembling method specifically includes the steps of:

s1: the cylinder head 100 and the cover plate 200 are fixed with the cylinder block 300 to pre-position the cylinder head 100 and the cover plate 200.

Taking the single cylinder head 100 as an example, the single cylinder head 100 and the cover plate 200 are respectively assembled to the cylinder block 300, the single cylinder head 100 is mounted to the first cylinder at the front end of the cylinder block 300, and the cover plate 200 is mounted behind the cylinder head 100. Specifically, because the butt ends of the cylinder cover 100 and the cover plate 200 are respectively provided with the step structure 110 and the inverted step structure 230, the step structure 110 and the inverted step structure 230 are matched during assembly, the cylinder cover bolt through holes in the cylinder cover 100 and the cover plate 200 are matched with the axis of the cylinder cover bolt hole in the cylinder block 300, 10 cylinder cover 100 bolts respectively penetrate through the cylinder cover bolt through holes in the cylinder cover 100 and the cover plate 200, the cylinder cover 100 bolts are screwed in a cross screwing sequence from inside to outside, and the pre-positioning of the single-cylinder cover 100 and the cover plate 200 is realized by screwing the cylinder cover 100 bolts.

S2: according to the pin hole 231 of the cover plate 200, the circle center position of the pin hole 231 of the cylinder cover 100 is determined, the circle center point is marked, the pin hole 231 of the cylinder cover 100 is machined according to the circle center point, and the deviation between the center line of the pin hole 231 of the cylinder cover 100 and the center line of the pin hole 231 of the cover plate 200 is ensured to be less than 0.10 mm.

Specifically, two pin holes 231 are machined in advance in the inverted stepped structure 230 of the cover plate 200, the position of the center of a circle of the pin holes 231 on the stepped structure 110 of the cylinder head 100 is determined by means of horizontal and vertical scribing lines by using the relative positions of the two pin holes 231 on the step of the cover plate 200, and a central punch is used for punching a central point at the intersection of the horizontal and vertical scribing lines, wherein the central point is the center of the circle.

Drilling a small hole with the diameter of 2mm according to the determined central point, detecting the gross-loss offset from the center of the bottom hole to the reference surface by using a caliper, converting the position of the bottom hole and the position of an ideal center through actual measurement, and if the gross-loss is not more than 0.10mm, properly increasing the top angle of the drill bit, weakening the automatic centering action, and compensating by a method of properly pushing a workpiece in the positive direction and gradually increasing the diameter of a drill tip during reaming. If the excessive loss is larger than 0.10mm, the two side walls of the bottom hole can be trimmed by using a mixed round file, the trimmed parts are in smooth transition connection with the circular arc of the bottom hole, and finally the deviation of the center lines of the pin holes 231 on the cylinder cover 100 and the cover plate 200 is ensured to be smaller than 0.10 mm. The punching and drilling operations must adopt a vertical drill orientation, i.e. the tool is ensured to be vertically downward and perpendicular to the upper surface of the cylinder cover.

S3: according to the fixing threaded hole 211 on the connecting side plate 210 of the cover plate 200, the circle center position of the threaded hole of the cylinder cover 100 is determined and the circle center point is marked, the threaded hole of the cylinder cover 100 is processed according to the circle center point, and the deviation between the threaded hole of the cylinder cover 100 and the center line of the fixing threaded hole 211 of the cover plate 200 is ensured to be less than 0.10 mm.

Specifically, two fixing threaded holes 211 are processed in advance on the two connecting side plates 210 of the cover plate 200, the circle center position of the threaded hole of the cylinder head 100 is determined by the same method as that in step S2, the circle center point is marked, the threaded hole is formed by drilling, reaming, tapping and other processes, and the deviation between the axis of the threaded hole and the axis of the fixing threaded hole 211 on the connecting side plate 210 of the cover plate 200 is required to be less than 0.10 mm.

S4: the positioning pins 3 are inserted into the pin holes 231 of the cylinder head 100 and the pin holes 231 of the cover plate 200, and threaded fasteners are screwed into the threaded holes of the cylinder head 100 and the threaded holes of the cover plate 200 to form a united body of the cylinder head 100 and the cover plate 200, and the united body is removed from the cylinder block 300.

Specifically, S41: a positioning pin 3 is inserted into a positioning pin 3 hole 231 of the cover plate 200 fixed to the cylinder block 300 and corresponding to the cylinder head 100; in the embodiment, a threaded fastener is screwed into a fixing threaded hole 211 of a connecting side plate 210 of the cover plate 200 and a threaded hole corresponding to the cylinder head 100, the threaded fastener adopts a flat-end asymmetric stud 1 with the thread specification of M6 multiplied by 1, the short end of the stud 1 is screwed into the threaded hole, then a nut 2 is screwed into the long end of the stud 1 and pre-tightened, the pre-tightening torque is 10 +/-1 N.m, and the cylinder head 100 and the cover plate 200 are fixedly connected through the stud 1 and the nut 2 to form a combined body. By adopting the combined fastening mode of the stud 1 and the nut 2, the stud 1 can be used for prepositioning between the cylinder cover and the cover plate 200 before pre-tightening, and frequent disassembly is convenient when each combined surface is leveled subsequently.

S42: bolts of the cylinder head 100 are cross-disassembled from the outside to the inside, and the combination of the cylinder head 100 and the head plate 200 is taken out from the cylinder block 300.

S5: leveling bolts 7 are mounted on the head plate 200, the assembly is placed on a plane with the assembly sealing surface facing upward, and the screwing amount of each leveling bolt 7 and/or threaded fastener is adjusted with the assembly sealing surface 101 of the cylinder head 100 as a horizontal reference, so that the horizontal inclination amount of the assembly sealing surface 201 of the head plate 200 is less than 0.04 mm.

Specifically, the leveling bolt 7 is screwed into the top leveling screw hole 221 of the cover plate 200, and the top surface of the cylinder head 100 is pressed downward against the inspection tool table surface a, as shown in fig. 7 and 8. And adjusting the screwing amount of each leveling bolt 7, measuring the integral flatness of the assembly sealing surface 201 of the cover plate 200 and the assembly sealing surface 101 of the cylinder cover 100 by using a level meter, and when the inclination amount of the level meter is less than 0.04mm, determining that the cover plate 200 is level with the bottom surface of the cylinder cover. If the diameter is more than 0.04mm, the requirement of leveling the bottom surfaces of the cover plate 200 and the single-cylinder cover 100 is met by adjusting the stud bolts 1 of the cover plate 200 and the cylinder cover 100, so that the subsequent sealing of a cylinder gasket is facilitated.

S6: an aluminum repairing agent 4 is filled in a gap 6 between the abutting end of the cylinder head 100 and the abutting end of the cover plate 200, and the cylinder head 100 and the cover plate 200 are bonded and fixed after the aluminum repairing agent 4 is cured, so that a cylinder head assembly 1100 is formed.

Specifically, the combined body posture in the step S5 is maintained, that is, the bottom surfaces of the cover plate 200 and the single-cylinder head 100 face upward, the aluminum repairing agent 4 is uniformly coated on the glue storage chamfer 5 formed by the step edge chamfer at the joint of the cover plate 200 and the bottom surface of the cylinder head 100 along the air intake and exhaust direction, the aluminum repairing agent 4 is in a liquid state and can be diffused along with the step gap 6 at the joint of the cover plate 200 and the single-cylinder head 100, and the gap between the cover plate 200 and the cylinder head 100 is ensured to be filled with the aluminum repairing agent 4.

And (3) smoothing the aluminum repairing agent 4 at the bottom surface glue storage chamfer 5 by using a scraper, standing the sample for 60 minutes, polishing the bottom surface glue storage chamfer 5 by using fine sand paper after the aluminum repairing agent 4 is completely cured, and checking the unevenness between the local part of the glue storage chamfer 5 and the bottom surface by using a knife edge ruler to ensure that the small unevenness is less than 0.02 mm. After the aluminum repairing agent 4 is completely cured, the bonding capability is strong, and the assembly gap reserved between the cover plate 200 and the cylinder cover 100 due to the machining precision is filled. The aluminum repairing agent 4 and the stud 1 are jointly connected with the cover plate 200 and the cylinder cover 100, so that the cover plate 200 and the cylinder cover 100 are fixedly connected into a whole, the structural strength is good, and the assembly sealing surface of the united body has high flatness. After the bottom surface finishing step, the water pressure and the oil pressure on the cylinder gasket can be guaranteed to be blocked in an assembly state, and the sealing of the cylinder gasket is guaranteed.

Example 3:

based on the same inventive concept, the embodiment provides a thermodynamic single cylinder engine 1000, and the thermodynamic single cylinder engine 1000 is formed by improving a mass production multi-cylinder engine. Referring to fig. 9 and 10, the single thermodynamic cylinder engine 1000 includes a cylinder block 300, a cylinder head assembly 1100, and a cylinder gasket interposed between the cylinder block 300 and the cylinder head assembly 1100 to seal a fitting sealing surface of the cylinder block 300 and the cylinder head assembly 1100. The cylinder head assembly 1100 is the cylinder head assembly 1100 of embodiment 1 described above, assembled by the assembly method of embodiment 2, for details see

embodiments

1 and 2.

Referring to fig. 9, the thermodynamic single cylinder engine 1000 further includes necessary accessories such as a generator 400, an air conditioner compressor 500, a cooling system 600, a lubricating system 700, and the like, wherein the cooling system 600 mainly includes a water pump, a radiator, and the like, and is used for realizing circulation of coolant in the engine and cooling the cylinder block 300 and the cylinder head assembly 1100. The lubricating system 700 mainly includes an oil pump, an oil cooler, an oil filter, and the like, and is used to realize circulation of oil in the engine and lubricate each kinematic pair of the engine. The accessories are conventional configurations of engine systems, and the present embodiment is not modified, and details thereof are disclosed in the related art and will not be described herein.

Taking the example of the improvement of a mass-produced four-cylinder engine into a thermodynamic single-cylinder engine 1000, the cylinder head assembly 1100 includes two components, namely a single-cylinder head 100 and a cover plate 200, the single-cylinder head 100 covers the first cylinder of the four-cylinder block 300, and the cover plate 200 covers the two, three, and four cylinders of the four-cylinder block 300. The cylinder block 300 is a mass-produced cylinder block 300 of a four-cylinder engine, and the structure is not modified, and specific contents may refer to related disclosure of the prior art, which will not be described herein.

Through the above embodiment, the present application has the following beneficial effects or advantages:

1) the application provides a connecting and sealing structure and an assembling method of a cylinder cover assembly 1100, solves the connecting and sealing problems of a thermodynamic engine built by using a thermodynamic single-cylinder cover 100 based on mass production of multi-cylinder engine cylinders, improves the reliability of the fast improved thermodynamic single-cylinder engine 1000, and provides a development idea of low cost of the cylinder cover of the thermodynamic engine.

2) 1100 is constituteed to cylinder head, through under the 230 location fit state of the stepped structure of 100 rear end steps of cylinder head 110 and apron 200 falling ladder structures, sets up locating pin 3 and realizes the accurate location of air admission and exhaust direction to the fastening of fore-and-aft direction is realized through stud 1 and nut 2's combination fastening at cylinder head rear end face and apron 200 front end, the restriction of above-mentioned two kinds of directions has promoted the joint strength between cylinder head 100 and the apron 200.

3) According to the cylinder cover assembly 1100 provided by the application, the top surface edge and the bottom surface edge of the step structure 110 at the rear end of the cylinder cover 100 are provided with the glue storage chamfers 5, and are matched with the glue storage chamfers 5 arranged on the front end surface section edge and the bottom plane edge of the inverted step structure 230 of the cover plate 200, and the glue storage chamfers are bonded and locked by the aluminum repairing agent 4, so that the direct connection strength between the cylinder cover 100 and the cover plate 200 is increased, and the assembly gap between the cylinder cover 100 and the cover plate 200 is filled; compared with silica gel, the aluminum repairing agent 4 can resist the pressure of the cooling liquid of the engine water jacket after being cured, and the sealing capability of the cylinder cover and the cover plate 200 is improved.

4) According to the cylinder cover assembly 1100 provided by the application, the leveling threaded holes 221 are respectively formed in the convex ridges 220 of the cover plate 200, the span of the leveling threaded holes 221 is as large as possible, and the cover plate 200 and the bottom surface of the cylinder cover can achieve high integral flatness through adjustment and support of the leveling bolts 7, so that a subsequent metal repairing agent smearing process is facilitated, and finally the cover plate 200 and the cylinder cover are fastened and connected.

5) According to the assembling method of the cylinder head assembly 1100, after the cylinder head 100 and the cover plate 200 are fixed on the cylinder block 300 as required, the positioning pin 3 hole 231 preprocessed through the inverted stepped structure 230 of the cover plate 200 is punched and drilled step by step on the stepped structure 110 of the cylinder head 100 and is connected through the positioning pin 3, so that the accurate positioning of the cylinder head 100 and the cover plate 200 in the air intake and exhaust directions is guaranteed.

6) The application provides a thermodynamics single cylinder machine 1000 adopts single cylinder head 100 and the novel thermodynamics engine system that volume production multi-cylinder machine border combination formed, both possesses thermodynamics single cylinder machine 1000's advantages such as quick, with low costs, easily adjustment, available volume production multi-cylinder machine's current model machine border and experimental frock again, finally realizes the optimal effect of its cost, each side such as cycle and experimental effect to can be used for the optimization upgrading of volume production multi-cylinder machine combustion system.

7) The application provides a thermodynamics single cylinder engine 1000, be by single cylinder head 100 with the novel thermodynamics engine system that the combination of volume production multi-cylinder engine formed, follow the assembly with the volume production cylinder head gasket between single cylinder head 100 and the volume production cylinder head 300, avoid the cylinder head gasket to seal inefficacy, coolant liquid in the cylinder head 300 water jacket leaks and leads to the problem of oil-water mixture in the oil pan, solve fastening hookup and sealed problem between single cylinder head 100 and the multi-cylinder body from this, improve this thermodynamics engine's reliability.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A cylinder head assembly characterized by: a cylinder block adapted to a multi-cylinder engine; the cylinder cover assembly comprises a cylinder cover and a cover plate which are arranged side by side along the arrangement direction of cylinders of the cylinder block, a first butt joint structure and a second butt joint structure which are matched with each other are respectively arranged at the butt joint ends of the cylinder cover and the cover plate, the cylinder cover and the cover plate are positioned through the first butt joint structure and the second butt joint structure, and the cylinder cover and the cover plate are fixedly connected through threaded fasteners.

2. The cylinder head assembly of claim 1, wherein: pin holes are formed in the first butt joint structure and the second butt joint structure, and positioning pins are inserted into the pin holes;

3. The cylinder head assembly of claim 2, wherein: the first butt joint structure is of a step structure, and the second butt joint structure is of an inverted step structure.

4. The cylinder head assembly of claim 3, wherein: the step structure is in clearance fit with the butt joint surface of the inverted step structure; a chamfer is arranged at the edge of the step structure and/or the corner between the surface layer and the side surface; a chamfer is arranged at the edge of the inverted ladder structure and/or the folding angle between the surface layer and the side surface;

5. The cylinder head assembly of claim 4, wherein: the surface layer gap between the step structure and the inverted step structure is 0.2-0.4 mm; the side gap between the step structure and the inverted step structure is 0.2-0.5 mm; and an aluminum repairing agent is filled in a gap between the butt joint end of the cylinder cover and the butt joint end of the cover plate.

6. The cylinder head assembly of any one of claims 2-5, wherein: the butt joint end of the cover plate is provided with a connecting side plate, and the cylinder cover is fixedly connected with the connecting side plate through the threaded fastener.

7. The cylinder head assembly of claim 6, wherein: the cover plate is provided with a raised ridge extending along the arrangement direction of the cylinders, and the connecting side plate is connected with the raised ridge; the end face of the connecting side plate protrudes out of the end face of the butt joint end of the cover plate.

8. The cylinder head assembly of claim 7, wherein: and more than 3 leveling threaded holes for mounting leveling bolts are formed in the end face, far away from the assembly sealing surface, of each raised ridge.

9. A method of assembling a cylinder head assembly according to claim 8, comprising the steps of:

10. A thermodynamic single cylinder engine, comprising:

a cylinder block;

the cylinder head assembly of any one of claims 1-8, attached to the cylinder block, a cylinder head of the cylinder head assembly covering a first cylinder of the cylinder block, a head plate of the cylinder head assembly covering other cylinders of the cylinder block;