CN1296609C - Crosshead large two-stroke internal combustion engine - Google Patents

Abstract

The invention discloses a crosshead type large double-stroke internal combustion engine. The engine includes a base (7), an A-shaped crankcase structure (2) and a cylinder structure (30, 30'). The base is provided with a main bearing supporting the crankshaft (22), and the crankcase structure is installed on the base and provided with a support. On the transverse support rib (9) of the guide plate (13) of the crosshead, the cylinder structure is installed on the crankcase structure, and the crankcase structure is clamped together with the base by tie rod bolts (16). The cylinder structure (30, 30') is formed of a welded structure and includes a generally flat upper steel plate (31) provided with a circular opening (39) for accommodating and supporting the cylinder liner (6). The cylinder structure is also provided with two outer side walls (32, 33) extending substantially parallel to the crankshaft (22), at least two transverse walls (34, 35, 36) interconnecting the side walls. The side walls (32, 33) of the cylinder structure are arranged approximately directly above the guide plate (13) such that the side walls are supported on the guide plate.

Description

Crosshead type large two-stroke internal combustion engine

technical field

The present invention relates to a crosshead type large double-stroke internal combustion engine, comprising a base with a main bearing supporting the crankshaft, an A-shaped crankcase structure mounted on the base, and a cylinder structure mounted on the A-shaped crankcase structure, the crankcase The structure and the base are clamped by tie rod bolts, the crankcase structure includes transverse ribs for supporting the crosshead type guide plate, the cylinder structure is formed by welding structure, and includes at least one cylinder liner for receiving and supporting the cylinder liner. A substantially flat upper steel plate of the circular opening, two outer side walls extending substantially parallel to the crankshaft and at least two transverse walls connected to the side walls. The cylinder structure forms the support to carry the cylinder liners, crankcase and purge air reservoir.

Background technique

It is known from the "K98MC Project Guide Two-Stroke Engine K98MC Project Guide" ("K98MC Project Guide Two-Stroke Engines" 2nd edition1999, MAN B&W Diesel A/S) of the second edition in 1999 that it is used for large two-stroke engines. The cylinder structure of an internal combustion engine is manufactured entirely from cast steel as a complete cylinder block for two or more cylinders or as a cylinder unit for a large engine. The camshaft housing is cast together with the cylinder structure as a unit. A generally flat upper steel plate has at least one circular opening for receiving and supporting the cylinder liner, the upper steel plate is mounted on the upper part of the cylinder structure.

For engines with cylinder bores up to 50 cm, the cylinder structure and camshaft housing are cast as one unit. When the cylinder bore is between 60-70 cm, the cylinder structure and cam housing are usually manufactured from a block comprising two cylinders. For large engines with a cylinder bore greater than 80 cm, the cylinder structure is cast from a block comprising only one cylinder. The cylinder structure of a large engine must be divided into several small units, otherwise its weight will exceed the maximum support weight of the lifting mechanism in the engine assembly equipment. Furthermore, current casting processes also limit the maximum size of objects to be cast. The production process of making the cylinder structure by casting is relatively cheap and a mature process, and the disassembly of the cylinder structure of a large engine will cause additional production costs.

For example, in order to machine a flat surface on the upper surface of a cylinder structure, individual units need to be lifted one by one onto a plane milling machine. Afterwards, they are bolted together and the cylinder structure is machined. However, the production process requires that the cylinder structure be assembled and disassembled before and after the machining process of the cylinder structure itself, before and after the engine running test, and during assembly at an engine workplace such as a ship or a power generation facility. Correspondingly, a considerable amount of additional resources is expended in large engines, since in these steps each cylinder structure needs to be assembled and adjusted from several units, and vice versa. Furthermore, the connections between the individual units of the cylinder structure must be strong and precise when assembled. The bolted connections applied here are expensive and labor intensive.

Patent application DK 1405/92 discloses a large two-stroke internal combustion engine of the crosshead type, comprising a cylinder structure made of welded plates. Thick cylinder structure side walls are provided directly above the outer walls of the crankcase structure, which thick side walls can withstand the enormous and varying pressures transmitted to the structural case and cylinder structure via stay bolts. Therefore, the outer wall of the crankcase structure also needs to be able to withstand the above-mentioned huge pressure transmitted by the tie rod bolts, and the outer wall of the crankcase also has a corresponding thickness. This leads to a considerable increase in the weight of the crankcase structure and the weight of the engine as a whole. Furthermore, the cylinder structure must span the entire width of the upper part of the crankcase structure. This results in a relatively large cylinder structure and requires an additional longitudinally extending wall to support the upper steel plate of the cylinder structure. Therefore, such a cylinder structure becomes relatively heavy.

Contents of the invention

The object of the present invention is to provide a crosshead type large-scale two-stroke internal combustion engine that overcomes the above-mentioned defects. The object of the present invention is achieved by providing a crosshead type two-stroke internal combustion engine comprising a base, an A-shaped crankcase structure and a cylinder structure, the base is provided with a main bearing supporting the crankshaft, the A-shaped crankcase structure is mounted on the base and on which There are transverse ribs to support the guide plates for the crosshead. The cylinder structure is installed in the A-shaped crankcase. The crankcase is clamped together with the base by tie rod bolts. The cylinder structure is formed by welded structure, including the roughly planar The upper steel plate is provided with at least one circular opening to accommodate and support the cylinder liner, the two outer side walls extend approximately parallel to the crankshaft, and at least two transverse walls are connected to the side walls, wherein the side walls are arranged in the guide directly above the guide tab so that the side walls rest on the guide tab.

By replacing the cast steel structure with a welded structure of steel plates, a lighter cylinder structure can be constructed. The integral cylinder structure of the present invention to support several cylinder liners of a large engine can also be lifted by existing load lifting mechanisms. Furthermore, by placing the thick cylinder structure side walls directly above the guide tabs of the crankcase structure on which the side walls rest, when the engine is running, the entire engine structure has the required rigidity to bear The entire engine structure can be realized lightweight while the bolts transmit huge and varying pressures to the structural box and cylinder structure.

The side walls and said support guides take up most of the forces acting on the engine mechanism via the stay bolts, so that the remaining structure can be of compact size.

The side walls and said transverse walls may be welded together so as to form a hollow body with a rectangular cross-section in the plane of the upper steel plate.

The side walls can be arranged inclined to each other, preferably at an angle of 0-10 degrees relative to the upper steel plate, more preferably at an angle of 2-10 degrees relative to the upper steel plate. This reduces the distance between the upper part of the side wall and the circular opening. Therefore, under the influence of the forces acting on the tie rods, the upper steel plate will bend less. The stress level at the joint between the upper steel plate and the side wall is thereby reduced.

Transverse walls may be provided between each cylinder, dividing the rectangular section into generally square sections surrounding each cylinder. An upper steel plate rests on each notch that accommodates the cylinder liner.

In order to improve the supporting force of the upper steel plate at each notch, the roughly square cross-section can be further provided with four other walls to form a hollow body with an octagonal cross-section in the plane where the upper steel plate is located.

The cylinder structure can also be provided with extension plates substantially perpendicular to the above-mentioned side walls, preferably in the plane where the transverse wall is located, at least one of the extension plates is connected with one of the side walls and a reinforcement plate A first hollow profile is formed, into which a stay bolt protrudes.

The A-shaped crankshaft configuration can also be provided with a second hollow profile into which the stay bolts protrude. The second hollow profile is formed by transverse ribs with one of the guide pieces and one of the reinforcing plates.

Preferably, the first hollow profile is arranged approximately directly above the second hollow profile, so that the first hollow profile rests on the second hollow profile. These hollow profiles thus form an integral part of the structure to withstand the enormous and varying pressures transmitted to the structural box and cylinder structure via stay bolts.

For practical reasons, the first hollow profile and the second hollow profile may have a substantially triangular cross-section.

The bending motion of the upper plate caused by the fluctuating force transmitted by the stay bolts from the cylinder liner to the sidewall creates a potential fatigue problem at the junction of the upper plate and the sidewall. One way to reduce the stress at the joint between the upper steel plate and the side wall is to provide a notch with an arc-shaped transverse cross-section on the bottom side of the upper steel plate adjacent to the weld, preferably the cross-section is arc-shaped, preferably semi-circular, semi-elliptical or other similar shapes. This is the punching effect, so that the fatigue problem of enlargement can be avoided to a large extent.

Fatigue problems at the connection between the upper steel plate and the side wall can also be reduced by connecting the upper steel plate and the steel plate of the load-bearing wall with fillet welded joints. groove.

The cylinder structure also includes a base plate formed of steel plate on which is provided an annular opening for receiving the airtight box.

To obtain a higher rigidity and strength of the cylinder structure, the side walls and/or said transverse walls may be made of sheet steel, preferably rolled sheet steel.

Other purposes, technical features, advantages and performances of the cylinder structure of the present invention will be more apparent from the following detailed description.

Description of drawings

In the following, the invention will be described in more detail with reference to specific embodiments shown in the accompanying drawings, in which

Fig. 1 is the sectional view of existing engine;

Figure 1a cutaway view of the engine;

Fig. 1b is the partial sectional enlarged view of Fig. 1 engine along the Ib-Ib line;

Fig. 2 is the perspective view of cylinder structure;

Fig. 3 is a partial sectional view of the upper part of the cylinder structure;

Fig. 3 a and 3b are the cross-sectional views of different structures of cylinder structures of different structures;

Fig. 4 is the perspective view of the purified air storage chamber installed on the cylinder structure;

Fig. 5 is the detailed cross-sectional view of clean air storage chamber and cylinder structure;

Figure 5a is a detailed view of a weld with a relief notch;

Figure 5b is a detailed view of a weld with relief grooves;

Fig. 6 is a more detailed cross-sectional view of cylinder structures and purge air reservoirs of different configurations; and

Fig. 7 is a schematic diagram showing the external dimensions of the combined unit of the cylinder structure and the purified air storage chamber.

Detailed ways

In the following detailed description, the present invention will be described by way of preferred embodiments. Figure 1 discloses an existing engine which is taller and wider than the engine of the present invention.

FIG. 1 a discloses a large 12-cylinder two-stroke straight-line purified diesel engine 1 arranged on a foundation 7 with main bearings for a crankshaft 22 . For ease of production, the base 7 is divided into several sections of suitable size. It consists of high welded stringers with cast steel bearing supports and welded cross members. The welded A-shaped crankcase structure 2 is installed on the base 7 . The crankcase structure is provided with support ribs arranged in the form of transverse plates 9 between each cylinder, and the transverse plates 9 are interconnected with the longitudinally extending outer walls 10 of the crankcase structure 2, and the transverse plates 9 are formed from the A-shaped crankcase structure 2 The top extends to the bottom to increase the lateral rigidity of the crankcase structure 2.

Vertical guide tabs 13 for taking up the forces acting on the crosshead 21 are mounted on the transverse plate 9, for example by welding. Two guide pieces 13 are laterally oppositely installed on both sides of the inner transverse plate 9 . The rear side of each guide piece 13 is supported by a vertically extending additional wall 14 connecting the guide piece and the transverse plate 9 . As shown, the additional wall 14 may comprise a flat plate element arranged at an acute angle to the transverse plate, but it is also possible to use an additional wall 14 having a horizontal quarter circumference or a quarter elliptical circumference portion, i.e. 9 approximately extends at right angles. The guide piece 13, the additional wall 14 and the transverse plate 9 form a hollow profile which accommodates the stay bolts and has high torsional rigidity.

As shown in Fig. 4, two cylinder structures 30, 30' are mounted on the top of the A-shaped crankshaft structure 2 in a straight line. Each cylinder structure 30, 30' supports six cylinder liners 6 of the engine 1. Of course, other structures can also be used, such as an engine with three cylinders, or an engine with eleven cylinders, which includes a cylinder structure with five cylinders and a cylinder structure with six cylinders. The cylinder liner 6 is made of alloy cast iron. The top of the cylinder liner 6 is provided with a cooling hole, and a short cooling sleeve is arranged in the cooling hole. The cylinder liner 6 is provided with exhaust holes and boreholes for cylinder lubrication. One side of the cylinder structure 30, 30' supports the camshaft case 3. The clean air storage chamber 4 is arranged along the other side of the cylinder structure 30, 30'. The clean air reservoir 4 supports a turbocharger unit 8 which pressurizes the clean air, and the exhaust gas receiver 11 balances the fluctuating pressure in the individual cylinders. The compressor of the turbocharger 8 draws air from the engine room through an air filter, and the compressed air is cooled by a clean air cooler working for a plurality of turbochargers. The clean air cooler is provided with a water mist brake, which prevents condensed water in the air from being carried into the clean air storage chamber and combustion chamber.

Referring to Fig. 2 and Fig. 3, the cylinder structure 30 will be described in detail, wherein the cylinder structure 30' is exactly the same as the cylinder structure 30. The cylinder structure 30 comprises two steel plates extending longitudinally forming the side walls 32 , 33 of the cylinder 30 . The side walls 32,33 are interconnected by steel plates extending transversely forming the front and rear walls 34,35. The side walls 32, 33 and the front and rear walls 34, 35 are welded together to form a hollow structure with a generally rectangular cross-section. The front and rear walls 34, 35 may also slope relative to each other to reduce the weight of the structure. Additional transversely extending steel plates 36 are provided between each cylinder, thus dividing the rectangular cross-section of the cylinder structure into square sections. Additional transverse steel plates 36 are welded to the side walls 32, 33 of the cylinder structure. As shown in Figure 3a, according to another preferred embodiment of the present invention, each cylinder is also provided with four steel plates 37 extending at an angle of 45° from the side wall to the additional plate side, so that the inner section of the cylinder structure is approximately into an octagon.

The cylinder structure can be made of ordinary steel plate or ingot iron. According to a preferred embodiment of the present invention, the steel plate for manufacturing the cylinder structure is a rolled steel plate. The upper steel plate can be made of other weldable materials, such as cast steel.

A circular opening 39 is provided in the upper steel plate 31 for receiving and supporting the cylinder liner 6 , which is welded to the steel plates forming the side walls 32 , 33 , front wall 34 , rear wall 35 and additional transversely extending steel plate 36 . Openings 38 are provided in the side walls 32 to allow clean air to enter the cylinder structure 30 for each cylinder. The upper steel plate 31 is also provided with a dense pair of holes 40 on its longitudinally extending edge to accommodate the stay bolts 16 .

As shown in Fig. 3, in a preferred embodiment of the present invention, the side walls 32, 33 are inclined to each other. Thus, the distance between the side walls 32 , 33 at the top of the cylinder structure 30 is smaller than the distance between the side walls 32 , 33 at the bottom of the cylinder structure 30 . The angle between the upper steel plate 31 and the side walls 32, 33 is preferably 2-10 degrees, but can also be selected as 0-20 degrees. Due to the arrangement of the side walls 32, 33 inclined towards each other, during engine operation, the upper steel plate 31 is bent due to the relatively large and varying force applied to the upper steel plate 31 by the cylinder liner 6 and tie rod bolts 16. The mechanical stresses at the welded joints between the steel plate 31 and the side walls 32, 33 are reduced.

In another preferred embodiment shown in FIG. 5 and FIG. 5 a , the side walls 32 and 33 are arranged at right angles to the upper steel plate 31 . Due to the notches 43 , 44 provided through the weld seam, the mechanical stress of the side wall weld joint is reduced. The notches 43, 44 have a semicircular cross-section. This cross-sectional shape can also be selected as a semi-ellipse or other similar shapes.

In another preferred embodiment of the present invention as shown in FIG. 5 b , the upper steel plate 31 is connected to the side walls 32 , 33 through fillet welding joints 48 . The junction of the fillet welded joint 48 and the side walls 32, 33, and the joint of the fillet welded joint 48 and the upper steel plate 31, for example, produce approximately semicircular grooves 49, 49' by grinding to reduce Mechanical stress between the fillet welded joint 48 and the corresponding steel plate 31 .

A base flange 45 extends horizontally from the bottom of the side walls 32 , 33 . Ribs 46 extending vertically and facing the camshaft case 3 are welded on the side wall 33 . A flange 47 for mounting to the camshaft case is welded to the rib 46 . A support plate 53 is welded to the end of the flange 47 and to the side wall 33 to form a triangular profile to accommodate the stay bolts. For engines without a camshaft, the support plate is welded directly to the wall 33 and rib 46 .

A laterally extending backing plate 50 is welded to the side wall 32 facing the clean air reservoir 4 . The extension plate 50 is provided with openings 51 to allow the flow of clean air. The flat plate 52 forming the top wall of the purified air storage chamber is welded between the stretcher plate 50 and the upper steel plate 31 . The reinforcing plate 53 extends from both sides of each spacer 50 at an acute angle to the side wall 32 to form a hollow profile with a substantially triangular cross-section on either side of the spacer 50 . The backing plate 50 , the reinforcing plate 53 and the side wall 32 together form a hollow profile with high torsional compressive stiffness, in which the stay bolt 16 is accommodated.

A generally square base plate 54 is welded to the inner surface of the cylinder structure 30 . The annular flange 55 of the airtight box for accommodating the piston rod is welded to the corresponding opening in the center of the bottom plate 54 .

The cylinder structure 30, 30' and the base 7 are clamped by pairs of closely arranged tie rod bolts, and the tie rod bolts 16 are arranged in the hollow contour of the cylinder structure and the hollow contour of the A-shaped crankcase structure 2, and from the cylinder structure 30, 30 'The upper steel plate 31 extends to the bottom of the A-shaped crankcase structure 2. And the side walls (32, 33) are located approximately directly above the guide piece (13). When the engine is running, these hollow profiles serve as guide grooves for the tie rod bolts, providing the required compressive rigidity to the cylinder structure 30, 30' and the box of the A-shaped crankcase structure 2 to withstand the tension of the tie rod bolts 16 to the crankcase. The box and cylinder structures 30, 30' of structure 2 deliver large, varying pressures. The lower end of the tie rod bolt 16 is suitably fastened in the threaded hole on the upper part of the base 7 . Preferably, the hollow profile of the cylinder structure 30, 30' and the hollow structure of the crankcase structure 2 have the same cross-section and are arranged one above the other. As shown in Figure 3, on the side of the camshaft case, the hollow structure of the cylinder structure 30, 30' can be broken by the flange 47 and installed on the camshaft case 3.

As shown in FIG. 4 , the C-shaped steel plate 56 forming part of the purified air storage chamber 4 is welded between the backing plates 50 . The inner space of the clean air storage chamber 4 is thus enclosed. Therefore, the side walls 32 of the cylinder structures 30, 30' are also the side walls of the clean air storage chamber 4. The side wall of the cylinder structure 30, 30' is also the side wall of the purified air storage chamber 4 through the side wall 32, so that the cylinder structure 30, 30' and the purified air storage chamber 4 become a compact unit. Another advantage of the present invention is that the turbocharger 8 can be placed lower, so that the exhaust receiver 11 can also be lowered, so that the overall height of the engine 1 can be reduced.

The exhaust receiver 11 is supported by a bracket 63 provided on the riser 50 . The relatively low position of the turbocharger 8 and the exhaust receiver 11 increases the natural frequency of the entire exhaust receiver arrangement. Due to the increased rigidity of the exhaust receiver 11, the exhaust receiver 11 can be divided into several units to reduce manufacturing costs.

The clean air storage chamber 4 is made up of different parts. Each cylinder configuration includes one or two dedicated sections 57 to house the turbocharger 8 and the cooling box 58 . The turbocharger support part 57 is of welded design, comprising an upper plate and openings provided in its lower part to receive air passing through the cooler. The cooling box is bolted or welded to the backing plate, which has an upper steel plate with openings to receive compressed air through the turbocharger. The flange of the turbocharger 8 is bolted to the upper steel plate of the cooling box 58 . An internal cooler in the form of a heat exchanger is provided inside the cooling box. The cooling box may span several sections of the purge air reservoir and service and support more than one turbocharger (not shown). Another dedicated part 60 of the clean air plenum 4 comprises an air inlet for an auxiliary blower 61 . The cooling box 58 may be shaped to have a diffuser portion so that an auxiliary blower is mounted inside the diffuser as a motor with impellers in such a way that the auxiliary blower is arranged parallel to or in line with the turbocharger Inserted in the diffuser body.

The purge air plenum 4 consists of twelve sections: six standard C-shaped sections 56 , three turbocharger support sections 57 and three auxiliary blower sections 60 . The clean air storage chamber 4 connects the two cylinder structures 30, 30' through a single annular bridging portion 62, and the annular bridging portion 62 is arranged between the outstretched pads 50 of the two cylinder structures 30, 30', and the three forms One straight line set. By welding the parts between the extension plates, the cylinder structure and the purge air reservoir form a stable integral structure with high rigidity.

By utilizing the modular design of the clean air reservoir 4, the individual parts can be produced in a relatively small workshop.

The upper rib 71 (refer to FIG. 1 ) used to connect the engine to the side wall of the engine case is connected to the extension plate 50 . The riser plate 50 can be attached to the upper stiffener at any position along its vertical extension. Thus, the height of the upper rib can be adapted very easily, for example to the platform height of the engine box.

As shown in Fig. 7, the cylinder structure 30, 30' with the purge air reservoir mounted thereon has a substantially rectangular cross-section, which makes the unit easy to implement in handling and processing during production.

Although the present invention has been described in detail for easy understanding, it can be understood that the purpose of such description is only for this purpose, and those skilled in the art can also modify the present invention without departing from the scope of the present invention.

Therefore, while the products and production methods of the present invention are described in detail with reference to preferred embodiments in accordance with the environment in which the production of the present invention is studied, these descriptions are merely illustrative of the principles of the present invention. Modifications may be made in the embodiments and structures of the invention without departing from the spirit of the invention and the scope of the claims.

Claims (17)

1. crosshead two-stroke explosive motor, comprise substrate (7), A shape crankcase structure (12) and cylinder structure (30,30 '), wherein, substrate (7) is provided with the main bearing that supports bent axle (22), A shape crankcase structure (2) is installed in the horizontal buttress (9) that the fairlead (13) of support crosshead (21) was gone up and had in substrate (7), cylinder structure (30,30 ') be installed on the A shape crankcase structure (2), crankcase structure (2) is clamped together by stay-bolt (16) and substrate (7), it is characterized in that: described cylinder structure (30) is formed by welded structure, described cylinder structure comprises the upper steel plate (31) that is roughly plane shape, two outer side walls (32 with described bent axle almost parallel extension, 33), at least two and the interconnective transverse wall (34 of sidewall, 35,36), upper steel plate is provided with at least one and holds circular open (39) with support cylinder lining (6), the relation of sidewall and fairlead (13) be sidewall (32,33) be located at fairlead (13) directly over.

2. two-stroke explosive motor as claimed in claim 1 is characterized in that: described sidewall (32,33) is welded together to form a hollow article with transverse wall (34,35,36), and described hollow article is roughly rectangular at the cross section on upper steel plate (31) plane, place.

3. two-stroke explosive motor as claimed in claim 1 or 2 is characterized in that: described sidewall (32,33) is obliquely installed mutually, and upper steel plate becomes 0-20 degree angle relatively.

4. two-stroke explosive motor as claimed in claim 3 is characterized in that: described transverse wall (34,35,36) is arranged between each cylinder, and the rectangular cross-section is divided into the cross section that roughly is square around each cylinder.

5. two-stroke explosive motor as claimed in claim 4 is characterized in that: also be provided with four walls (32 ', 33 ', 37 ') around the cross section of described general square shape and be roughly octagonal hollow article to form the cross section in upper steel plate (31) plane, place.

6. two-stroke explosive motor as claimed in claim 4, it is characterized in that: described cylinder structure (30,30 ') also comprise from sidewall (32,33) extension plate (50) of approximate vertical extension, one of them extension plate (50) and one of them sidewall (32,33) and a stiffening plate (53) form first hollow profile together, one of them stay-bolt (16) extend in first hollow profile.

7. two-stroke explosive motor as claimed in claim 1, it is characterized in that: one of them is buttress (9) and one of them fairlead (13) and a stiffening plate (14) formation second hollow profile laterally, and one of them stay-bolt (16) extend in second hollow profile.

8. two-stroke explosive motor as claimed in claim 7 is characterized in that: position relation first hollow profile of described first, second hollow profile roughly is located at directly over second hollow profile first hollow profile is supported on second hollow profile.

9. two-stroke explosive motor as claimed in claim 7 is characterized in that: described first, second hollow profile all has and is roughly leg-of-mutton cross section.

10. two-stroke explosive motor as claimed in claim 1, it is characterized in that: described upper steel plate (31) and sidewall (32,33) and/or transverse wall (34,35,36) locate to connect at soldering point (42), described upper steel plate (31) the contiguous soldering point in bottom (42) locates to be provided with the breach (43,44) with arc section.

11. two-stroke explosive motor as claimed in claim 1, it is characterized in that: described upper steel plate (31) and sidewall (32,33) and/or transverse wall (34,35,36) in the welding of fillet soldering point place, at groove that reduces mechanical stress of the joint of fillet soldering point, upper steel plate and sidewall processing.

12. two-stroke explosive motor as claimed in claim 1 is characterized in that: motor also comprises the diapire of being made by steel plate (54), and diapire is provided with an annular opening (55) of accommodating stuffing box.

13. two-stroke explosive motor as claimed in claim 1 is characterized in that: described sidewall (32,33) and/or transverse wall (34,35,36) are made by steel plate.

14. two-stroke explosive motor as claimed in claim 3 is characterized in that: described sidewall (32,33) becomes the angle of 2-10 degree to be obliquely installed mutually with relative upper steel plate.

15. two-stroke explosive motor as claimed in claim 6 is characterized in that: described extension plate (50) is to extend in transverse wall (34,35,36) plane, place.

16. two-stroke explosive motor as claimed in claim 10 is characterized in that: described arc is semicircle or half elliptic.

17. two-stroke explosive motor as claimed in claim 13 is characterized in that: described steel plate is a rolled plate.

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