Gap adjusting device and optical internal combustion engine

Abstract

The invention relates to a gap adjusting device and an optical internal combustion engine, the gap adjusting device having a cylinder head, a cylinder liner, a gap adjusting disk and a cylinder liner carrier, the cylinder liner being fitted at the gap adjusting disk, the gap adjusting disk being arranged at the cylinder liner carrier, the cylinder liner carrier being fixed on one side at the cylinder head and on the other side at the cylinder block, the cylinder liner being fixed relative to the cylinder head by means of the cylinder liner carrier together with the gap adjusting disk, the gap between the cylinder liner and the cylinder head being adjusted by adjusting the position of the gap adjusting disk relative to the cylinder liner carrier.

Description

Technical Field

[0001] The present invention relates to a clearance adjustment device capable of adjusting the gap between the cylinder head and the cylinder liner, and an optical internal combustion engine having such a clearance adjustment device. Background Technology

[0002] To better understand the workings of internal combustion engines, researchers often use optical internal combustion engines to study airflow, spray formation, and combustion processes within the combustion chamber. Compared to conventional internal combustion engines, optical internal combustion engines can visualize the internal workings of the combustion chamber using two-dimensional or three-dimensional images, providing more information and thus guiding targeted optimization of the combustion chamber design.

[0003] Structurally, due to the long assembly chain, it is difficult to guarantee the final assembly clearance between the top surface of the cylinder liner and the bottom surface of the cylinder head. If the clearance is too small, the cylinder liner may break during assembly or operation. Conversely, if the clearance is too large, reliable sealing of the combustion chamber cannot be guaranteed. Furthermore, when the cylinder liner is made of expensive, high-purity, high-strength quartz glass, the machinability of the glass cylinder liner is difficult to guarantee, making it hard to ensure that the clearance between the cylinder liner and the cylinder head is within the ideal range. When the clearance does not meet the requirements, since it cannot be adjusted during or after assembly, new parts must be remanufactured, thus extending the entire test and development cycle and significantly increasing R&D costs. Summary of the Invention

[0004] According to one aspect of the invention, the objective is to provide a clearance adjusting device for adjusting the clearance between the cylinder liner and the cylinder head, specifically the clearance between the top surface of the cylinder liner and the bottom surface of the cylinder head.

[0005] According to one aspect of the present invention, a clearance adjusting device includes a cylinder head, a cylinder liner, a clearance adjusting disc, and a cylinder liner bracket. The cylinder liner is mounted on the clearance adjusting disc, and the clearance adjusting disc is arranged on the cylinder liner bracket. One side of the cylinder liner bracket is fixed to the cylinder head, and the other side is fixed to the cylinder block. The cylinder liner and the clearance adjusting disc are fixed relative to the cylinder head by means of the cylinder liner bracket. The clearance between the cylinder liner and the cylinder head is adjusted by adjusting the position of the clearance adjusting disc relative to the cylinder liner bracket.

[0006] According to one aspect of the present invention, the clearance adjusting disc is provided with a set of bosses evenly distributed along its periphery at the bottom surface away from the cylinder liner, and correspondingly, a plurality of recesses for receiving the bosses are provided at the top surface of the cylinder liner bracket, the recesses having the same shape as the bosses and being evenly arranged along the periphery of the cylinder liner bracket, wherein one set of recesses has a different depth than the other set of recesses.

[0007] According to one aspect of the present invention, a gap adjusting device is provided at the gap adjusting disc with a pair of bosses spaced 180° apart, and correspondingly, a plurality of pairs of recesses are provided at the cylinder liner bracket, with the recesses in each pair spaced 180° apart.

[0008] According to one aspect of the invention, the gap adjusting device has a boss on the gap adjusting disc and a recess on the cylinder liner bracket constructed in a truncated sector shape to prevent the gap adjusting disc from rotating relative to the cylinder liner bracket.

[0009] According to one aspect of the invention, a clearance adjusting device is provided at the clearance adjusting disc, wherein a drilled hole is provided for receiving a locating pin and a bolt, by means of the locating pin and the bolt, the clearance adjusting disc being pre-positioned relative to the cylinder liner bracket.

[0010] According to one aspect of the invention, the cylinder liner support is provided with a plurality of pillars on its top surface facing the cylinder liner and cylinder head, and the cylinder liner is placed in the space enclosed by the pillars to protect the cylinder liner from external impact.

[0011] According to one aspect of the invention, the gap adjustment device of the optical internal combustion engine has cylinder liners made of glass.

[0012] According to one aspect of the present invention, an O-ring is arranged in the gap between the cylinder liner and the cylinder head in a gap adjusting device.

[0013] According to one aspect of the present invention, a clearance adjusting device is provided with an annular recessed structure on the top surface of the clearance adjusting disc facing the cylinder liner, and the cylinder liner can be placed in the recessed structure.

[0014] The gap adjustment device according to the present invention can adjust the gap between the bottom surface of the cylinder head and the top surface of the cylinder liner of an optical internal combustion engine.

[0015] Furthermore, the present invention also proposes an optical internal combustion engine having a cylinder block, piston, crankshaft connecting rod mechanism, and such clearance adjustment device, thus possessing the advantages described above. Attached Figure Description

[0016] The invention will be described in more detail with reference to the accompanying drawings, in which:

[0017] Figure 1 An exploded view of a gap adjustment device according to an embodiment of the present invention is shown;

[0018] Figure 2 Showing the source Figure 1 A three-dimensional view of the gap adjustment disc;

[0019] Figure 3 This is shown from another direction, originating from... Figure 2 A three-dimensional view of the gap adjustment disc;

[0020] Figure 4 Showing the source Figure 1 Cylinder liner bracket. Detailed Implementation

[0021] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0022] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0023] Figure 1 The clearance adjustment device according to the present invention is shown, comprising a cylinder head 10, a cylinder liner 20, a clearance adjustment disc 30, and a cylinder liner bracket 40. As with common internal combustion engines, intake valves, exhaust valves, spark plugs, and other components are typically arranged at the cylinder head 10. When the piston housed in the cylinder block moves to top dead center, the cylinder liner 20, the cylinder head 10, and the top surface of the piston together form a combustion chamber. The cylinder liner bracket 40 is fixed above the cylinder head 10 and below to the cylinder block (not shown). In the case of an optical internal combustion engine for testing, the cylinder liner 20 mentioned herein can optionally be made of glass, such as high-strength quartz glass. Furthermore, the combustion process and gas injection within the combustion chamber can be photographed and observed through this transparent glass cylinder liner. Of course, observation of the combustion chamber can also be achieved, for example, by using a combination of a transparent optical piston head and a reflector, or by other means.

[0024] The cylinder liner 20 is placed or fixed on the clearance adjusting disc 30, while the clearance adjusting disc 30 is placed or fixed on the cylinder liner bracket 40. The cylinder liner 20 and the clearance adjusting disc 30 are fixed relative to the cylinder head 10 by means of the cylinder liner bracket 40. For example, the cylinder liner 20 can be fixed to the clearance adjusting disc 30 by means of threaded fasteners, and the clearance adjusting disc 30 can also be fixed to the cylinder liner bracket 40 by means of threaded fasteners.

[0025] Through holes 21, 31, and 41 of the same size are provided at the center of the cylinder liner 20, the clearance adjusting plate 30, and the cylinder liner bracket 40. The size of the through hole is slightly larger than the outer diameter of the piston so as to allow the piston to reciprocate within it.

[0026] Optionally, refer to Figure 2 and Figure 3 The clearance adjusting disc 30 has an annular recessed structure 32 on its top surface facing the cylinder liner 20 for placing the cylinder liner. The top surface of the recessed structure 32 forms a surface contact fit with the bottom surface of the cylinder liner 20, meaning that the two are in non-linear contact, which reduces the contact stress between them to a certain extent. Furthermore, the recessed structure 32 also has a groove for installing a rubber gasket to prevent the glass cylinder liner 20 from being scratched or cracked due to direct contact with the metal material of the clearance adjusting disc 30.

[0027] Similarly, the cylinder liner bracket 40 has an annular recessed structure 42 on its top surface facing the clearance adjustment plate 30 for placing the clearance adjustment plate 30. When assembled, the recessed structure forms a surface contact fit with the bottom surface of the clearance adjustment plate 30 in order to reduce the contact stress between the two.

[0028] It should be noted that the terms "top surface" and "bottom surface" are based on their orientation relative to the cylinder head 10 in the assembled state, that is, the side facing the cylinder head 10 is called the "top surface", while the side facing away from the cylinder head 10 is called the "bottom surface".

[0029] Optionally, a drilled hole 33 is provided at the clearance adjusting disc 30 to accommodate the locating pin 50 and bolt 60, which allows the clearance adjusting disc 30 to be pre-positioned relative to the cylinder liner bracket 40. Subsequently, the cylinder liner bracket 40, together with the cylinder liner 20 and the clearance adjusting disc 30, is fixed to the cylinder head 10 by means of mounting bolts 70. The gap between the curved surface of the top surface of the cylinder liner 20 and the curved surface of the bottom surface of the cylinder head 10 can be sealed by means of O-rings. This gap can be set, for example, to 2.0 mm and filled by two O-rings to form a sealed combustion chamber.

[0030] A set of bosses 34 are provided on the bottom surface of the clearance adjusting disc 30 opposite to the cylinder liner 20. These bosses are evenly arranged along the periphery of the clearance adjusting disc 30. Correspondingly, multiple sets of recesses 43 with the same shape as these bosses are provided on the cylinder liner bracket 40 to accommodate the bosses 34. Each set of recesses, or one set of recesses, has a different depth than the other set. By matching the bosses 34 with recesses of different depths, the clearance between the top surface of the cylinder liner 20 and the bottom surface of the cylinder head 10 can be changed, thereby providing a certain degree of redundancy in the design and manufacturing of this clearance. In actual production, this method can reduce the machining accuracy and cost of the cylinder liner.

[0031] It should be noted that the concept of "a set" can be, but is not mandatory, limited to two, and can also include more than two. Furthermore, the number of each set of bosses and notches is preferably equal or in multiples.

[0032] Optionally, such as Figure 3 and Figure 4 As shown, the clearance adjusting disc 30 has a pair of bosses 34 spaced 180° apart. Correspondingly, the cylinder liner bracket 40 has three pairs of recesses 43, 43', and 43'', with each recess in each pair arranged 180° apart. The depths of these three pairs of recesses 43, 43', and 43'' can vary in a certain gradient, for example, in a gradient of 0.1 mm. In particular, the first pair of recesses 43 has a depth of 1.8 mm; the second pair of recesses 43' has a depth of 1.9 mm; and the third pair of recesses 43'' has a depth of 2.0 mm. Correspondingly, the bosses 34 of the clearance adjusting disc can have a height greater than or equal to 2.0 mm. Thus, by cooperating the bosses 34 of the clearance adjusting disc with the recesses 43, 43', and 43'' of different depths, the clearance between the top surface of the cylinder liner 20 placed on the clearance adjusting disc 30 and the bottom surface of the cylinder head 10 can be maintained within a specified range, for example, a clearance of 2 mm.

[0033] Optionally, the boss 34 and the recess 43 can be configured in a truncated sector shape to prevent the clearance adjusting disc 30 from rotating relative to the cylinder liner bracket 40. The term "truncated sector shape" as used herein is similar to a trapezoid, having two sides angled relative to each other and two curved sides, such as... Figure 3 and Figure 4 As shown.

[0034] It should be noted that the present invention is not limited to the scheme in which the boss of the clearance adjusting plate matches the recess of the cylinder liner bracket, but also includes the scheme in which the recess of the clearance adjusting plate matches the boss of the cylinder liner bracket.

[0035] A plurality of supports 44 are provided on the top surface of the cylinder liner bracket 40 facing the clearance adjusting disc 30. For example, in the illustrated embodiment, four supports are provided, which are evenly arranged along the periphery of the cylinder liner bracket 40. These supports enclose a space around a central through-hole, in which the cylinder liner 20 can be accommodated to prevent it from breaking due to external impact in the case of a glass cylinder liner. In addition, in the assembled state, the supports 44 abut against and are fixed to the cylinder head 10.

[0036] Furthermore, the present invention also includes an optical internal combustion engine having a cylinder block, piston, crankshaft connecting rod mechanism, flywheel, and clearance adjustment device according to any one or more of the foregoing embodiments, the technical features and effects of which correspond to the foregoing description, and therefore will not be repeated here.

[0037] It should be understood that all the above embodiments are exemplary and not restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present invention should be within the legal protection scope of the present invention.

Claims

1. A clearance adjusting device for adjusting the clearance between the cylinder liner and cylinder head of an optical internal combustion engine, characterized in that, The clearance adjusting device includes a clearance adjusting disc and a cylinder liner bracket. The cylinder liner is fitted onto the clearance adjusting disc, which is located on the cylinder liner bracket. One side of the cylinder liner bracket is fixed to the cylinder head, and the other side is fixed to the cylinder block. The cylinder liner and the clearance adjusting disc are together fixed relative to the cylinder head by means of the cylinder liner bracket. The clearance adjusting disc has a set of protrusions evenly distributed along the periphery on the bottom surface away from the cylinder liner, and multiple sets of recesses for accommodating the protrusions are provided on the top surface of the cylinder liner bracket. The recesses have the same shape as the protrusions and are evenly arranged along the periphery of the cylinder liner bracket. One set of recesses has a different depth than the other set of recesses. Alternatively, the cylinder liner bracket has a boss, and the clearance adjusting disc has a recess, with the boss of the cylinder liner bracket engaging with the recess of the clearance adjusting disc. By engaging the boss with recesses of different depths, the position of the clearance adjusting disc relative to the cylinder liner bracket can be adjusted, thereby adjusting the clearance between the cylinder liner and the cylinder head.

2. The gap adjusting device according to claim 1, characterized in that, A pair of bosses spaced 180° apart are provided at the clearance adjustment disc, and multiple pairs of recesses are provided at the cylinder liner bracket, with the recesses in each pair spaced 180° apart.

3. The gap adjusting device according to claim 1, characterized in that, The boss of the clearance adjusting disc and the recess of the cylinder liner bracket are constructed in a truncated sector shape to prevent the clearance adjusting disc from rotating relative to the cylinder liner bracket.

4. The gap adjusting device according to claim 1, characterized in that, A drilled hole is provided at the clearance adjusting plate to accommodate a locating pin and a bolt, which are used to pre-position the clearance adjusting plate relative to the cylinder liner bracket.

5. The gap adjusting device according to claim 1, characterized in that, The cylinder liner bracket has multiple supports on its top surface facing the cylinder liner and cylinder head. The cylinder liner is placed in the space enclosed by the supports to protect it from external impacts.

6. The gap adjusting device according to claim 5, characterized in that, The cylinder liner is made of glass.

7. The gap adjusting device according to claim 1, characterized in that, An O-ring is arranged in the gap between the cylinder liner and the cylinder head.

8. The gap adjusting device according to any one of claims 1 to 7, characterized in that, An annular recessed structure is provided on the top surface of the clearance adjusting disc facing the cylinder liner, and the cylinder liner can be placed in the recessed structure.

9. An optical internal combustion engine, characterized in that, It has a cylinder block, a piston, a crankshaft connecting rod mechanism, and a clearance adjustment device according to any one of claims 1 to 8.

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