Extrusion test tool for cylinder sleeve supporting shoulder of highly-strengthened water-cooled diesel engine

Abstract

The utility model discloses a highly-strengthened water-cooled diesel engine cylinder sleeve support shoulder extrusion test tool, which belongs to the technical field of diesel engines and comprises a base, a positioning ring is sleeved in the base, and the inner wall and the upper end face of the positioning ring are respectively used for positioning the outer wall of a cylinder sleeve body and a support shoulder. The pressing block is arranged above the base and the positioning ring and used for being pressed on the cylinder sleeve body, a conical groove is formed in the center of the top of the pressing block, and a pressing head with a spherical lower end is arranged in the conical groove. According to the utility model, the cylinder sleeve is accurately and reliably positioned and clamped; the extrusion test effect is good, and technical support is provided for stress analysis and structural design of the supporting shoulder part of the cylinder sleeve.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel engines, in particular to a performance test tool for a cylinder liner. Background Art

[0002] The cylinder liner of a water-cooled diesel engine is a thin-walled part. As one of the important parts of the diesel engine combustion chamber system, it forms a combustion chamber with the piston and the cylinder head, and guides the piston to reciprocate. Since it is surrounded by coolant on the outside and alternating pressure and high-temperature combustion gas on the inside, the temperature difference between the inside and outside of the cylinder liner is large. During the operation of the diesel engine, it is simultaneously subjected to the influence of the mechanical load and thermal load in the cylinder. Due to the explosion pressure and the increase in speed of the high-strength diesel engine, the thermal load and mechanical load on the cylinder liner are aggravated. The comprehensive stress generated by these loads is the main reason for the crack failure of the cylinder liner, causing problems such as insufficient fatigue strength, which seriously endangers the durability and reliability of the diesel engine. The structural form of the root of the cylinder liner support shoulder is a rounded transition, which is very easy to cause stress concentration, and the fatigue resistance and fatigue life are relatively poor, and it is easy to have problems such as cracks and fractures at the root of the support shoulder. The use of rolling technology in the processing of cylinder liner can effectively reduce problems such as cracks and fractures at the root of the support shoulder, but there is a lack of extrusion test tooling to provide technical support for the force analysis and structural design of the support shoulder. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test tooling, which can accurately and reliably position and clamp the cylinder liner; the extrusion test effect is good, and technical support is provided for the force analysis and structural design of the cylinder liner support shoulder.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test tool, characterized in that it includes a base, a positioning ring is sleeved in the base, the inner wall and the upper end surface of the positioning ring are respectively used to position the outer wall of the cylinder liner body and the support shoulder, and also includes a pressure block arranged above the base and the positioning ring for pressing on the cylinder liner body, a conical groove is arranged at the center of the top of the pressure block, and a pressure head with a spherical lower end is arranged in the conical groove.

[0006] A further improvement of the technical solution of the utility model is that the pressure block is a step shaft structure, and the small end and the shoulder of the step shaft are respectively matched with the inner wall of the cylinder sleeve body and the top surface of the supporting shoulder.

[0007] A further improvement of the technical solution of the utility model is that the large outer diameter of the pressing block is smaller than the inner diameter of the positioning ring.

[0008] A further improvement of the technical solution of the utility model is that the radius of the large outer circle of the pressing block is 3 to 5 mm smaller than the radius of the positioning ring.

[0009] A further improvement of the technical solution of the utility model is that: the base, the positioning ring and the outer periphery of the pressing block are all connected with handles through threaded holes.

[0010] A further improvement of the technical solution of the utility model is that: knurling is provided on the outer surface of the handle.

[0011] A further improvement of the technical solution of the utility model is that the base and the positioning ring are both cylindrical structures, a step hole is provided at the upper end of the base, a step shaft is provided at the lower end of the positioning ring, and the step hole of the base and the step shaft of the positioning ring are plugged in and matched to achieve positioning.

[0012] A further improvement of the technical solution of the utility model is that the length of the step axis of the positioning ring is greater than the depth of the step hole of the base.

[0013] A further improvement of the technical solution of the utility model is that the base and the locating ring matching surface are clearance matching, the matching clearance is 0.15-0.25mm, and the locating ring and the cylinder sleeve matching surface are clearance matching, the matching clearance is 0.15-0.20mm.

[0014] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0015] The utility model forms an extrusion test fixture of a cylinder liner support shoulder through a base, a positioning ring, a pressure block and a pressure head. The cylinder liner is accurately and reliably positioned and clamped, and the extrusion test effect is good, providing technical support for the force analysis and structural design of the cylinder liner support shoulder.

[0016] The large outer diameter of the pressure block is smaller than the inner diameter of the locating ring, and is 3-5mm smaller on one side, preferably 4mm, to ensure that the cylinder sleeve support shoulder is subjected to shear force and avoid transferring the force to the bottom surface of the locating ring to achieve the best test effect.

[0017] The base, the positioning ring and the outer periphery of the pressing block are all connected with a handle through a threaded hole, and the outer surface of the handle is knurled for easy holding and operation. The step shaft length of the positioning ring is greater than the depth of the step hole of the base, reducing the processing accuracy requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 is a schematic diagram of the pressure head structure;

[0021] Figure 3 It is a schematic diagram of the briquetting structure;

[0022] Figure 4 It is a schematic diagram of the positioning ring structure;

[0023] Figure 5 is a schematic diagram of the base structure;

[0024] Figure 6 It is a schematic diagram of the handle structure;

[0025] Among them, 1. pressure head; 2. pressure block; 3. handle; 4. positioning ring; 5. base. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the embodiments:

[0027] A highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test fixture, such as Figures 1 to 6 As shown, it includes a base 5, a positioning ring 4, a pressure block 2 and a pressure head 1. The positioning ring 4 is sleeved in the base 5. The inner wall and the upper end surface of the positioning ring 4 are used to position the outer wall of the cylinder liner body and the support shoulder respectively. The pressure block 2 is arranged above the base 5 and the positioning ring 4 to be pressed on the cylinder liner body, and the center of the pressure block 2 coincides with the center of the base 5 and the positioning ring 4. A conical groove is arranged at the center of the top of the pressure block 2, and a pressure head 1 with a spherical lower end is arranged in the conical groove. The utility model forms an extrusion test fixture for the cylinder liner support shoulder through the base 5, the positioning ring 4, the pressure block 2 and the pressure head 1, which can accurately and reliably position and clamp the cylinder liner, and the extrusion test effect is good, providing technical support for the force analysis and structural design of the cylinder liner support shoulder.

[0028] Among them, the base 5 and the positioning ring 4 are both cylindrical structures, and a step hole is arranged at the upper end of the base 5, that is, a circular hole larger than the size of the through hole at the lower end is opened inside the upper end of the base 5 to form a step, and a step shaft is arranged at the lower end of the positioning ring 4, that is, the outer circumferential diameter of the lower end of the positioning ring 4 is smaller than the outer diameter of the upper end of the positioning ring 4 to form a step, and the step hole of the base 5 and the step shaft of the positioning ring 4 are plugged in and matched to achieve positioning.

[0029] Further preferably, in order to facilitate assembly and processing, the step axis length of the positioning ring 4 is greater than the depth of the step hole of the base 5, that is, after assembly, there is space between the upper end surface of the base 5 and the lower end step surface of the positioning ring 4.

[0030] Furthermore, for better assembly and testing, the present invention defines the matching relationship: the matching surface between the base 5 and the positioning ring 4 is a clearance match, the matching clearance is 0.15-0.25 mm, and the matching surface between the positioning ring 4 and the cylinder sleeve is a clearance match, the matching clearance is 0.15-0.20 mm.

[0031] The utility model designs the pressing block 2 into a stepped shaft structure, and the small end and the shoulder of the stepped shaft are matched with the inner wall of the cylinder sleeve body and the top surface of the supporting shoulder respectively. In addition, the outer diameter of the pressing block 2 is smaller than the inner diameter of the positioning ring 4, ensuring that the supporting shoulder of the cylinder sleeve is subjected to shear force, avoiding the force from being transmitted to the bottom surface of the positioning ring, and achieving the best test effect. The outer radius of the pressing block 2 is 3 to 5 mm smaller than the radius of the positioning ring 4, preferably about 4 mm.

[0032] In a further preferred solution, the base 5, the positioning ring 4 and the outer periphery of the pressing block 2 are all connected with a handle 3 through threaded holes, and the outer surface of the handle 3 is provided with knurling for easy holding and operation. The step shaft length of the positioning ring is greater than the depth of the step hole of the base, reducing the requirements for processing accuracy.

[0033] Extrusion tooling assembly method and instructions:

[0034] Install two handles 3 at the threaded holes of the pressure block 2, the positioning ring 4, and the base 5. Place the base 5 on the workbench of the press machine, place the positioning ring 4 in the matching surface of the base 5, and vertically place the cylinder sleeve body along the inner hole wall of the positioning ring 4, so that the lower end surface of the cylinder sleeve support shoulder contacts the upper end surface of the positioning ring 4, then place the pressure block 2 on the upper end surface of the cylinder sleeve, and finally place the pressure head 1 in the upper groove of the pressure block 2.

[0035] Extrusion test steps:

[0036] Adjust the slide block of the press machine to make it slowly descend, and after it contacts the pressure head 1, gradually apply pressure, and stress concentration occurs at the cylinder liner support shoulder. When it exceeds the support shoulder yield limit, cracks and fractures occur at the cylinder liner support shoulder. At this time, stop applying pressure, record the pressure value, and raise the slide block of the press machine, and the test is finished. The utility model provides a test tool, which provides technical support for the force analysis and structural design of the cylinder liner support shoulder by using the test process and test data obtained in the prior art.

[0037] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test tool, characterized in that: The invention comprises a base (5), a positioning ring (4) is sleeved inside the base (5), the inner wall and the upper end surface of the positioning ring (4) are used to position the outer wall of the cylinder sleeve body and the support shoulder respectively, and also comprises a pressing block (2) arranged above the base (5) and the positioning ring (4) and used to press on the cylinder sleeve body, a conical groove is arranged at the top center of the pressing block (2), and a pressing head (1) with a spherical lower end is arranged in the conical groove.

2. A highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test fixture according to claim 1, characterized in that: The pressing block (2) is a stepped shaft structure, and the small end and the shoulder of the stepped shaft are respectively matched with the inner wall of the cylinder sleeve body and the top surface of the supporting shoulder.

3. A highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test fixture according to claim 2, characterized in that: The larger outer diameter of the pressing block (2) is smaller than the inner diameter of the positioning ring (4).

4. A highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test fixture according to claim 3, characterized in that: The radius of the large outer circle of the pressing block (2) is 3 to 5 mm smaller than the radius of the positioning ring (4).

5. The highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test tooling according to claim 1 is characterized in that: The base (5), the positioning ring (4) and the outer periphery of the pressing block (2) are all connected with a handle (3) via threaded holes.

6. A highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test fixture according to claim 5, characterized in that: The outer surface of the handle (3) is provided with knurling.

7. The highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test fixture according to claim 1, characterized in that: The base (5) and the positioning ring (4) are both cylindrical structures. The upper end of the base (5) is provided with a stepped hole, and the lower end of the positioning ring (4) is provided with a stepped shaft. The stepped hole of the base (5) and the stepped shaft of the positioning ring (4) are plugged together to achieve positioning.

8. The highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test fixture according to claim 7, characterized in that: The step axis length of the positioning ring (4) is greater than the depth of the step hole of the base (5).

9. The highly reinforced water-cooled diesel engine cylinder liner support shoulder extrusion test fixture according to claim 1, characterized in that: The matching surfaces of the base (5) and the positioning ring (4) are clearance matched, and the matching clearance is 0.15-0.25 mm. The matching surfaces of the positioning ring (4) and the cylinder sleeve are clearance matched, and the matching clearance is 0.15-0.20 mm.

Images