Engine cylinder sleeve assembly and assembling method

Abstract

The invention provides an engine cylinder sleeve assembly and an assembling method, relates to the technical field of engine assembling, and aims to solve the problem that relative postures are difficult to accurately control when an engine cylinder sleeve, a water jacket and an engine body are assembled. Rigid fixation of the relative positions of the cylinder sleeve and the water sleeve is achieved through a combined structure of the positioning taper hole, the positioning through hole and the positioning piece, the positioning taper section of the positioning piece penetrates through the water sleeve positioning through hole and then is coaxially matched with the cylinder sleeve positioning taper hole, and the positioning stability of the taper structure is enhanced through surface contact. And the positioning sections are coaxially matched with the water jacket positioning through holes, circumferential rotation is limited, the relative positions of the cylinder sleeve and the water jacket are locked through double matching, dislocation of the cylinder sleeve and the water jacket in the assembling process is avoided, and synchronous and accurate control over the relative positions of the cylinder sleeve, the water jacket and a machine body is achieved.

Description

Technical Field

[0001] This invention relates to the field of engine assembly technology, and specifically to an engine cylinder liner assembly and assembly method. Background Technology

[0002] For cylinders with larger diameters and longer strokes, such as cylinders with a diameter of 280 mm and a stroke of 420 mm, the engine cylinder liners are made of alloy cast iron and have a wet cylinder liner structure. Generally, the engine cylinder liner has a cylindrical structure with a stepped flange at the upper end. The step contacts the upper surface of the engine block to bear the weight of the cylinder liner, and a rubber ring is installed at the cylinder liner sealing position to ensure that the cylinder liner fits tightly with the base.

[0003] Compared to traditionally sized cylinders, when the cylinder diameter and stroke are larger, the connecting rod is prone to collision and interference with the bottom edge of the cylinder liner when it swings relative to the connecting rod axis on the cylinder. To avoid interference between the connecting rod's movement trajectory and the bottom of the cylinder liner, a notch is often made at the bottom of the cylinder liner to avoid this interference. This satisfies the guiding requirements of the piston skirt while preventing interference. When assembling the cylinder liner into the engine block, the piston, connecting rod, and cylinder liner are pre-assembled and moved together. After the bottom of the cylinder liner is inserted into the cylinder bore of the engine block, the notch is obscured by the piston and connecting rod, making it difficult to observe from the normal assembly position. Adjusting the engine block position to observe from the bottom of the cylinder bore affects assembly efficiency. After installing a water jacket structure on the cylinder liner, the obstruction problem becomes even more severe. Not only is it difficult to control the relative posture of the cylinder liner and the engine block, but the relative position between the cylinder liner and the water jacket is also difficult to control. This results in lower assembly accuracy of the cylinder liner, water jacket, and engine block, requiring secondary adjustments and alignment, which affects the assembly efficiency of large-diameter, long-stroke cylinder engines. Summary of the Invention

[0004] In view of this, the present invention provides an engine cylinder liner assembly and assembly method, which establishes multiple positioning structures to assist positioning during assembly and improve efficiency.

[0005] The first objective of this invention is to provide an engine cylinder liner assembly, which adopts the following solution: The cylinder liner has a clearance notch at the bottom and a positioning notch at the top. The positioning notch and the clearance notch are distributed along the same generatrix on the outer circumference of the cylinder liner. A positioning cone hole is formed on the outer circumference of the cylinder liner. The water jacket has a positioning through hole on its outer circumferential wall. When the water jacket and cylinder liner are aligned and assembled, the positioning cone hole and the positioning through hole are coaxial. The positioning component includes coaxially distributed positioning conical segments and positioning sections. The positioning conical segments can pass through the positioning through holes and then coaxially engage with the positioning conical holes. The positioning sections coaxially engage with the positioning through holes to maintain the relative positions of the cylinder liner and the water jacket.

[0006] Furthermore, along the outer circumference of the cylinder liner, guide marks are provided on both sides of the positioning cone hole to indicate the location of the positioning cone hole.

[0007] Furthermore, the guide markings are arranged in a linear array of multiple guide arrows, with the tips of the guide arrows pointing towards the positioning cone hole, to guide the adjustment direction when the positioning cone hole and the positioning through hole are aligned.

[0008] Furthermore, the positioning through hole is a threaded hole, and the positioning segment of the positioning element is a threaded segment that mates with the threaded hole.

[0009] Furthermore, the distal end of the positioning through hole is provided with a tapered countersunk head, the positioning tapered hole is a blind hole, and the maximum diameter of the positioning tapered hole is smaller than the minimum diameter of the positioning through hole.

[0010] Furthermore, the outer conical surface of the positioning conical segment can fit into the inner conical surface of the positioning conical hole, and the end of the positioning conical segment is a spherical cap surface.

[0011] A second objective of this invention is to provide a method for assembling an engine cylinder liner assembly, comprising: The cylinder liner and water jacket are initially assembled, and their relative angles are adjusted so that the positioning cone hole on the outer circumferential surface of the cylinder liner corresponds to the positioning through hole on the outer circumferential wall of the water jacket. The positioning component is installed into the aligned positioning through hole and positioning cone hole. During the alignment process of the positioning cone section and the positioning cone hole, the relative positions of the cylinder liner and water jacket are calibrated so that the positioning segment is inserted into the positioning through hole, thereby achieving the coaxial distribution of the positioning segment and the positioning through hole, and temporarily fixing the cylinder liner and water jacket. After the cylinder liner and water jacket assembly is assembled, the cylinder liner and water jacket are hoisted into the cylinder bore of the engine block and the angle is calibrated through the positioning notch at the top of the cylinder liner. The cylinder liner and water jacket are finally assembled and fixed to the engine block.

[0012] Furthermore, guide marks are provided on the outer circumferential surfaces of the cylinder liner on both sides of the positioning cone hole. After the cylinder liner and water jacket are initially assembled, the guide marks are exposed through the positioning through hole. The relative positions of the cylinder liner and water jacket are adjusted according to the guide marks so that the positioning cone hole can be exposed through the positioning through hole.

[0013] Furthermore, after the positioning cone segment of the positioning member passes through the positioning through hole, it gradually enters the positioning cone hole. During the process of probing into the positioning cone hole, the inner cone surface of the positioning cone hole and the outer cone surface of the positioning cone segment are squeezed and reciprocated to push the positioning cone hole and the positioning cone segment to align until the positioning cone hole and the positioning cone segment are coaxial.

[0014] Furthermore, after the cylinder liner and water jacket are finally assembled and fixed to the engine block, the positioning component is removed, or the positioning component is retained and the portion of the positioning component exposed on the outer circumference of the water jacket is removed.

[0015] Compared with the prior art, the advantages and positive effects of this invention are: To address the problem of precise control over the relative posture of engine cylinder liners, water jackets, and engine blocks during assembly, a structure is developed in which positioning notches and clearance notches are distributed along the same generatrix. This transforms the unobservable bottom clearance notch position into the visually observable top positioning notch position. During assembly, the operator does not need to observe the obscured bottom clearance notch; the position of the bottom clearance notch can be indirectly determined solely by the positioning notch at the top of the cylinder liner. This allows for precise control of the relative position of the cylinder liner and the engine block, avoiding positioning deviations caused by obstruction of the clearance notch. No adjustment of the engine block posture is required. The combination of positioning cone holes, positioning through holes, and positioning components achieves rigid fixation of the relative position of the cylinder liner and water jacket. The positioning cone section of the positioning component passes through the positioning through hole of the water jacket and engages coaxially with the positioning cone hole of the cylinder liner. The cone structure enhances positioning stability through surface contact, preventing radial displacement. The positioning segment engages coaxially with the positioning through hole of the water jacket, restricting circumferential rotation. This double engagement locks the relative position of the cylinder liner and water jacket, preventing misalignment during assembly. Combined with the precise control of the relative posture of the cylinder liner and engine block by the top positioning notch, synchronous and precise control of the relative positions of the cylinder liner, water jacket, and engine block is achieved.

[0016] Guide markers are placed on both sides of the positioning cone hole along the outer circumference of the cylinder liner. During the initial assembly of the cylinder liner and water jacket, the operator can directly locate the position of the positioning cone hole by following the guide arrows, without having to repeatedly search or use additional tools to confirm the hole position. The linear array of arrows forms a gradient guide, allowing the operator to quickly determine the accurate orientation of the positioning cone hole even in situations where assembly space is limited or the visual angle is poor. This enables efficient adjustment of the relative angle between the cylinder liner and water jacket, ensuring precise alignment of the positioning cone hole and the positioning through hole, reducing adjustment time during the initial assembly stage, and improving assembly efficiency.

[0017] By setting the locating through hole as a threaded hole and the locating segment of the locating component as a threaded segment that mates with the threaded hole, compared to a simple cylindrical surface fit, the threaded fit can form a double lock in the axial and circumferential directions through the self-locking characteristics of the helical pair. During the process of the threaded segment being screwed into the threaded hole, the axial position stability of the locating component and the water jacket can be ensured by controlling the screwing depth. The meshing action of the threads can effectively prevent the cylinder liner and the water jacket from rotating circumferentially relative to each other during assembly or transportation, and avoid the failure of the coaxial relationship between the locating cone hole and the locating through hole, thereby ensuring the long-term stability of the relative position of the cylinder liner and the water jacket, and providing a reliable foundation for the subsequent final assembly stage.

[0018] The positioning through hole has a tapered countersunk head at its distal end, and the positioning tapered hole is a blind hole with a maximum diameter smaller than the minimum diameter of the positioning through hole. This guides the positioning tapered section of the positioning component to smoothly enter the positioning through hole, avoiding collisions between the positioning component and the edge of the through hole due to minor deviations during assembly. This ensures that the positioning tapered section of the positioning component first forms a preliminary guide with the positioning through hole, and then forms a tight-fitting tapered surface with the positioning tapered hole, achieving a progressive assembly from coarse positioning to fine positioning. This improves positioning accuracy while protecting the surface of the component from damage. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is a schematic diagram of the cylinder liner structure in one or more embodiments of the present invention.

[0021] Figure 2 This is a schematic diagram of a cylinder liner in one or more embodiments of the present invention.

[0022] Figure 3 This is a schematic diagram of a water jacket in one or more embodiments of the present invention.

[0023] Figure 4 This is a schematic diagram of the pre-assembly of an engine cylinder liner assembly in one or more embodiments of the present invention.

[0024] Figure 5 This is a schematic diagram of an engine cylinder liner assembly installed on an engine in one or more embodiments of the present invention.

[0025] Among them, 1. Cylinder liner; 2. Positioning cone hole; 3. Guide mark; 4. Water jacket; 5. Positioning through hole; 6. Positioning component; 7. Stand; 8. Avoidance notch; 9. Positioning notch; 10. Engine body. Detailed Implementation

[0026] Example 1 In a typical embodiment of the present invention, such as Figures 1-5 As shown, an engine cylinder liner assembly is presented.

[0027] The assembly of cylinder liners 1 in large-diameter, long-stroke engines suffers from difficulties in positioning and low assembly accuracy. During cylinder liner 1 assembly, the bottom clearance notch 8 is obstructed by the pre-installed piston and connecting rod, making its position impossible to observe under normal assembly posture. Even adjusting the engine block 10 posture for observation from the bottom of the cylinder bore reduces assembly efficiency. Adding a water jacket 4 exacerbates the obstruction problem, further hindering accurate judgment of the notch position. The relative posture of cylinder liner 1 and engine block 10 is difficult to control precisely, and the relative position between cylinder liner 1 and water jacket 4 lacks effective constraints, resulting in insufficient assembly accuracy and requiring secondary alignment adjustments. This severely impacts the assembly efficiency of large-diameter, long-stroke engines. Therefore, this embodiment provides an engine cylinder liner assembly with a positioning structure to assist in positioning the various components of the engine cylinder liner assembly, improving assembly efficiency and accuracy.

[0028] like Figures 1-5 As shown, the engine cylinder liner assembly mainly includes a cylinder liner 1, a water jacket 4, and a positioning component 6. The water jacket 4 is fitted over the cylinder liner 1, and the positioning component 6 fixes the relative position of the water jacket 4 and the cylinder liner 1.

[0029] The bottom end of the cylinder liner 1 is provided with a clearance notch 8 for avoiding the connecting rod, and the top end is provided with a positioning notch 9. The positioning notch 9 and the clearance notch 8 are distributed along the same generatrix on the outer circumference of the cylinder liner 1, that is, the orientation reference of the upper and lower notches is consistent. At the same time, a positioning cone hole 2 is machined on the outer circumference of the cylinder liner 1 as a reference structure for positioning with the water jacket 4.

[0030] The water jacket 4 has a positioning through hole 5 on its outer circumferential wall at the position corresponding to the positioning cone hole 2 of the cylinder liner 1. This through hole matches the positioning cone hole 2 of the cylinder liner 1, providing support for the positioning of the cylinder liner 1 and the water jacket 4.

[0031] The positioning component 6 consists of a coaxially distributed positioning conical section and a positioning segment. The positioning conical section is adapted to the positioning conical hole 2 of the cylinder liner 1, and the positioning segment is adapted to the positioning through hole 5 of the water jacket 4. The positioning function is achieved through the double cooperation.

[0032] By utilizing the structural design where the positioning notch 9 and the clearance notch 8 are distributed along the same generatrix, the previously unobservable position of the bottom clearance notch 8 is transformed into the directly observable position of the top positioning notch 9. During assembly, the operator does not need to observe the obscured bottom clearance notch 8; the position of the bottom clearance notch 8 can be indirectly determined solely by the positioning notch 9 at the top of the cylinder liner 1. Because the upper and lower notches are distributed along the same generatrix, the position of the top positioning notch 9 directly reflects the position of the bottom clearance notch 8. By adjusting the relative attitude of the positioning notch 9 and the preset reference of the engine block 10, the relative position of the cylinder liner 1 and the engine block 10 can be precisely controlled, avoiding positioning deviations caused by the obstruction of the clearance notch 8. This eliminates the need to adjust the attitude of the engine block 10, significantly improving positioning convenience.

[0033] The combination of the positioning cone hole 2, the positioning through hole 5, and the positioning element 6 achieves rigid fixation of the relative positions of the cylinder liner 1 and the water jacket 4. First, the cylinder liner 1 and the water jacket 4 are initially aligned, ensuring that the positioning cone hole 2 of the cylinder liner 1 and the positioning through hole 5 of the water jacket 4 are coaxially aligned. Then, the positioning element 6 is inserted into the two holes. The positioning cone section of the positioning element 6 passes through the positioning through hole 5 of the water jacket 4 and engages coaxially with the positioning cone hole 2 of the cylinder liner 1. The cone structure enhances positioning stability through surface contact, preventing radial displacement. The positioning segment engages coaxially with the positioning through hole 5 of the water jacket 4, restricting circumferential rotation. This double engagement firmly locks the relative positions of the cylinder liner 1 and the water jacket 4, preventing misalignment during assembly. Simultaneously, combined with the precise control of the relative posture of the cylinder liner 1 and the engine block 10 by the top positioning notch 9, the synchronous and precise control of the relative positions of the cylinder liner 1, the water jacket 4, and the engine block 10 is achieved.

[0034] The top positioning notch 9 replaces the bottom clearance notch 8 as the observation benchmark, allowing for accurate determination of the position of the clearance notch 8 without adjusting the attitude of the engine block 10, thus completely solving the positioning problem caused by the obstruction of the clearance notch 8. The cooperation between the positioning component 6 and the positioning cone hole 2 and positioning through hole 5 enables the rapid alignment and fixation of the cylinder liner 1 and the water jacket 4, avoiding secondary adjustments and significantly improving assembly efficiency. The alignment of the generatrices of the positioning notch 9 and the clearance notch 8 ensures the accurate relative attitude of the cylinder liner 1 and the engine block 10. The double-fitting structure of the positioning component 6 firmly constrains the relative position of the cylinder liner 1 and the water jacket 4, achieving high-precision assembly of the cylinder liner 1, the water jacket 4, and the engine block 10, reducing assembly errors.

[0035] This embodiment can adapt to the needs of large-diameter, long-stroke scenarios, and specifically solves the problems of difficult positioning and low accuracy caused by the large size of components and limited assembly space in large-diameter, long-stroke cylinder engines, thus ensuring the stability and efficiency of the assembly process of such engines.

[0036] like Figure 1 and Figure 2 As shown, along the outer circumference of the cylinder liner 1, guide marks 3 are provided on both sides of the positioning cone hole 2. The guide marks 3 are positioned to indicate the location of the positioning cone hole 2. The guide marks 3 are arranged in a linear array of multiple guide arrows, with the tips of the guide arrows pointing towards the positioning cone hole 2, so as to guide the adjustment direction when the positioning cone hole 2 and the positioning through hole 5 are aligned.

[0037] Specifically, guide markers 3 are set on both sides of the positioning cone hole 2 along the outer circumference of the cylinder liner 1. Their core function is to reduce the difficulty of initial alignment between the cylinder liner 1 and the water jacket 4. During the initial assembly of the cylinder liner 1 and the water jacket 4, the operator can directly locate the position of the positioning cone hole 2 by following the guide arrows, without repeatedly searching or using additional tools to confirm the hole position. The linear array distribution of the arrows forms a gradient guide, allowing for quick determination of the accurate orientation of the positioning cone hole 2 even in situations with limited assembly space or poor visual angles. This enables efficient adjustment of the relative angle between the cylinder liner 1 and the water jacket 4, ensuring precise alignment between the positioning cone hole 2 and the positioning through hole 5, reducing adjustment time during the initial assembly stage, and further improving assembly efficiency.

[0038] In this embodiment, the positioning through hole 5 is set as a threaded hole, and the positioning segment of the positioning component 6 is set as a threaded segment that mates with the threaded hole. The rigid constraint of the threaded connection strengthens the relative position fixation of the cylinder liner 1 and the water jacket 4. Compared with a simple cylindrical surface fit, the threaded fit can form a double lock in the axial and circumferential directions through the self-locking characteristics of the helical pair. On the one hand, during the process of the threaded segment being screwed into the threaded hole, the axial position stability of the positioning component 6 and the water jacket 4 can be ensured by controlling the screwing depth. On the other hand, the meshing action of the threads can effectively prevent the cylinder liner 1 and the water jacket 4 from rotating circumferentially relative to each other during assembly or transportation, avoiding the failure of the coaxial relationship between the positioning cone hole 2 and the positioning through hole 5, thereby ensuring the long-term stability of the relative position of the cylinder liner 1 and the water jacket 4, and laying a reliable foundation for the subsequent final assembly stage.

[0039] The distal end of the positioning through hole 5 is equipped with a tapered countersunk head, and the positioning tapered hole 2 is a blind hole with a maximum diameter smaller than the minimum diameter of the positioning through hole 5. The tapered countersunk head can guide the positioning tapered section of the positioning component 6 to smoothly enter the positioning through hole 5, avoiding collision between the positioning component 6 and the edge of the through hole due to minor deviations during assembly. The blind hole design of the positioning tapered hole 2 restricts the over-insertion of the positioning component 6, preventing it from penetrating the inner wall of the cylinder liner 1 and affecting the piston movement. The dimensional relationship that the maximum diameter of the positioning tapered hole 2 is smaller than the minimum diameter of the positioning through hole 5 ensures that the positioning tapered section of the positioning component 6 first forms a preliminary guide with the positioning through hole 5, and then forms a tight conical surface fit with the positioning tapered hole 2, realizing a progressive assembly from coarse positioning to fine positioning, improving positioning accuracy while protecting the surface of the component from damage.

[0040] The outer conical surface of the positioning conical section fits into the inner conical surface of the positioning conical hole 2, and the spherical crown surface at the end optimizes the reliability of the positioning fit and the assembly tolerance. The conical surface fit achieves high-precision positioning through a large contact area, which can effectively compensate for minor errors in the machining or assembly of cylinder liner 1 and water jacket 4, ensuring their coaxiality. The spherical crown surface at the end reduces the alignment requirements when the positioning part 6 is inserted. Even if there is a slight angular deviation between the positioning part 6 and the positioning conical hole 2, the spherical crown surface can gradually guide the conical section to fit into the conical hole through point contact, avoiding component deformation or jamming caused by rigid collision, making the assembly process of the positioning part 6 smoother, and enhancing the sealing performance of the conical surface fit, reducing the risk of coolant leakage, since coolant flow often occurs between water jacket 4 and cylinder liner 1.

[0041] In this embodiment, the multi-layered collaboration of guiding marker 3 to improve alignment efficiency, threaded fit to enhance fixing reliability, and size matching and shape optimization to ensure assembly accuracy and safety solves the problems of difficult alignment, loose fixing and low fault tolerance in the assembly of large-diameter, long-stroke cylinder engines. This makes the assembly process of cylinder liner 1 assembly more efficient, the positioning more accurate and the structure more stable, ultimately significantly improving the overall assembly quality and production efficiency of the engine.

[0042] Example 2 In another typical embodiment of the present invention, such as Figures 1-5 As shown, an assembly method for an engine cylinder liner assembly is provided, utilizing the engine cylinder liner assembly as described in Example 1, including the following steps: On the test bench 7, the cylinder liner 1 and the water jacket 4 are initially assembled and their relative angles are adjusted so that the positioning cone hole 2 on the outer circumferential surface of the cylinder liner 1 corresponds to the positioning through hole 5 on the outer circumferential wall of the water jacket 4. The positioning component 6 is installed into the aligned positioning through hole 5 and positioning cone hole 2. During the alignment process of the positioning cone section and the positioning cone hole 2, the relative positions of cylinder liner 1 and water jacket 4 are calibrated so that the positioning segment is inserted into the positioning through hole 5, thereby achieving the coaxial distribution of the positioning segment and the positioning through hole 5, and temporarily fixing cylinder liner 1 and water jacket 4. After the cylinder liner 1 and water jacket 4 are assembled and positioned, they are hoisted into the cylinder bore of the engine block 10 as a whole, and the angle is calibrated through the positioning notch 9 at the top of the cylinder liner 1. The cylinder liner 1 and water jacket 4 are finally assembled and fixed to the engine block 10.

[0043] By employing a step-by-step positioning, rigid constraint, and precise calibration process, the assembly of cylinder liner 1, water jacket 4, and engine block 10 is broken down into operable steps. Structural features are used to replace invisible assembly requirements with visible positioning references. The relative positions are locked by the rigid fit of positioning component 6. Finally, the overall assembly accuracy is ensured through final assembly calibration, thus solving the problems of difficult positioning and low efficiency caused by obstruction in the assembly of large-diameter, long-stroke cylinder engines.

[0044] In practice, after the initial assembly of cylinder liner 1 and water jacket 4, the operator can quickly align them using the guide marks 3 on both sides of the positioning cone hole 2 on the outer circumferential surface of cylinder liner 1. Observing through the positioning through hole 5 of water jacket 4, when the guide mark 3 is visible in the through hole, the operator can adjust the relative angle between cylinder liner 1 and water jacket 4 according to the characteristic that the arrow tip points to the positioning cone hole 2, until the positioning cone hole 2 is visible in the through hole. The purpose of the guide mark 3 is to visualize the position of the positioning cone hole 2, avoiding blind searching when the circumferential dimensions of the outer circumferential surfaces of cylinder liner 1 and water jacket 4 are large, thus significantly shortening the initial alignment time.

[0045] The installation process of positioning component 6 achieves the locking of the relative positions of cylinder liner 1 and water jacket 4 through conical surface guidance and rigid fit. After the positioning conical section of positioning component 6 passes through the positioning through hole 5 of water jacket 4, it gradually probes into the positioning conical hole 2 of cylinder liner 1. Since the outer conical surface of the positioning conical section matches the inner conical surface of the positioning conical hole 2, the squeezing force generated when they come into contact will automatically push cylinder liner 1 and water jacket 4 to finely adjust their relative positions until the positioning conical hole 2 and the positioning conical section are coaxial, that is, the positioning conical hole 2 and the positioning through hole 5 are coaxial. Subsequently, the positioning segment of positioning component 6, such as the threaded segment, is inserted into the positioning through hole 5, such as the threaded hole, and fixed in place. Through the self-locking characteristic of the threaded connection or the tight fit, cylinder liner 1 and water jacket 4 are temporarily rigidly fixed to prevent relative displacement during subsequent hoisting and transportation, ensuring that the initial alignment accuracy is maintained.

[0046] Utilizing the structural feature that the positioning notch 9 and the clearance notch 8 are distributed along the same generatrix, the positional requirement of the bottom clearance notch 8 is transformed into a visual calibration of the top positioning notch 9. After the cylinder liner 1-water jacket 4 assembly with the positioning component 6 installed is hoisted into the cylinder bore of the engine block 10, the operator observes the positioning notch 9 at the top of the cylinder liner 1 and adjusts the angle of the assembly to align the positioning notch 9 with the preset reference of the engine block 10, such as the piston movement axis. Since the positioning notch 9 and the bottom clearance notch 8 are aligned, the completion of the top calibration means that the bottom clearance notch 8 is precisely aligned with the connecting rod movement trajectory, avoiding positioning deviations caused by the clearance notch 8 being obstructed. Calibration can be completed without adjusting the attitude of the engine block 10, significantly improving the final assembly efficiency.

[0047] After the cylinder liner 1 and water jacket 4 are finally fixed to the engine block 10, the positioning component 6 is handled in two ways. If the positioning component 6 is only a temporary auxiliary component during the assembly process, such as a screw with a smooth rod section, it can be removed to avoid interfering with the internal moving parts of the engine. If it is necessary to enhance the connection rigidity between the cylinder liner 1 and the water jacket 4 (especially under the condition of a large-diameter cylinder liner 1), the positioning component 6 is retained and the exposed part is removed to ensure that it does not affect the assembly of the external structure of the engine or other components. Alternatively, a non-exposed positioning component 6, such as a countersunk hexagon socket head cap screw, can be used. Both methods are based on the premise of not affecting the normal operation of the engine, while taking into account assembly efficiency and structural stability.

[0048] The assembly process is broken down into initial alignment, temporary fixing, and final calibration steps. Each step relies on a clear structural benchmark, avoiding the blind adjustment based on experience in traditional assembly and reducing the need for secondary alignment.

[0049] The visual design of the guide mark 3 and the positioning notch 9 reduces positioning time, and the rigid fixation of the positioning part 6 avoids repeated adjustments, making the assembly process of large-diameter, long-stroke cylinder engines more efficient. The self-aligning characteristic of the conical surface fit and the orientation transmission function of the positioning notch 9 ensure that the relative position error of the cylinder liner 1, water jacket 4 and engine block 10 is controllable, meeting the requirements of engine operation for component fitting accuracy. No special tools or complex posture adjustments are required; assembly can be completed through the positioning characteristics of the structure itself, reducing dependence on operator skills and improving the stability of the assembly process.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An engine cylinder liner assembly, characterized in that, include: The cylinder liner has a clearance notch at the bottom and a positioning notch at the top. The positioning notch and the clearance notch are distributed along the same generatrix on the outer circumference of the cylinder liner. A positioning cone hole is formed on the outer circumference of the cylinder liner. The water jacket has a positioning through hole on its outer circumferential wall. When the water jacket and cylinder liner are aligned and assembled, the positioning cone hole and the positioning through hole are coaxial. The positioning component includes coaxially distributed positioning conical segments and positioning sections. The positioning conical segments can pass through the positioning through holes and then coaxially engage with the positioning conical holes. The positioning sections coaxially engage with the positioning through holes to maintain the relative positions of the cylinder liner and the water jacket.

2. The engine cylinder liner assembly as described in claim 1, characterized in that, Along the outer circumference of the cylinder liner, guide marks are provided on both sides of the positioning cone hole to indicate the location of the positioning cone hole.

3. The engine cylinder liner assembly as described in claim 2, characterized in that, The guide markings are arranged in a linear array of multiple guide arrows, with the tips of the guide arrows pointing towards the positioning cone hole to guide the adjustment direction when the positioning cone hole and the positioning through hole are aligned.

4. The engine cylinder liner assembly as described in claim 1, 2, or 3, characterized in that, The positioning through hole is a threaded hole, and the positioning segment of the positioning element is a threaded segment that mates with the threaded hole.

5. The engine cylinder liner assembly as described in claim 4, characterized in that, The distal end of the positioning through hole is provided with a tapered countersunk head. The positioning tapered hole is a blind hole, and the maximum diameter of the positioning tapered hole is smaller than the minimum diameter of the positioning through hole.

6. The engine cylinder liner assembly as claimed in claim 5, characterized in that, The outer conical surface of the positioning conical segment can fit with the inner conical surface of the positioning conical hole, and the end of the positioning conical segment is a spherical cap surface.

7. A method for assembling an engine cylinder liner assembly as described in any one of claims 1-6, characterized in that, include: The cylinder liner and water jacket are initially assembled, and their relative angles are adjusted so that the positioning cone hole on the outer circumferential surface of the cylinder liner corresponds to the positioning through hole on the outer circumferential wall of the water jacket. The positioning component is installed into the aligned positioning through hole and positioning cone hole. During the alignment process of the positioning cone section and the positioning cone hole, the relative positions of the cylinder liner and water jacket are calibrated so that the positioning segment is inserted into the positioning through hole, thereby achieving the coaxial distribution of the positioning segment and the positioning through hole, and temporarily fixing the cylinder liner and water jacket. After the cylinder liner and water jacket assembly is assembled, the cylinder liner and water jacket are hoisted into the cylinder bore of the engine block and the angle is calibrated through the positioning notch at the top of the cylinder liner. The cylinder liner and water jacket are finally assembled and fixed to the engine block.

8. The assembly method of the engine cylinder liner assembly as described in claim 7, characterized in that, The cylinder liner outer circumference on both sides of the positioning cone hole is provided with guide marks. After the cylinder liner and water jacket are initially assembled, the guide marks are exposed through the positioning through hole. The relative positions of the cylinder liner and water jacket are adjusted according to the guide marks so that the positioning cone hole can be exposed through the positioning through hole.

9. The assembly method of the engine cylinder liner assembly as described in claim 8, characterized in that, After the positioning cone segment of the positioning component passes through the positioning through hole, it gradually enters the positioning cone hole. During the process of probing into the positioning cone hole, the inner cone surface of the positioning cone hole and the outer cone surface of the positioning cone segment are squeezed and pushed to align the positioning cone hole and the positioning cone segment until the positioning cone hole and the positioning cone segment are coaxial.

10. The assembly method of the engine cylinder liner assembly as described in claim 9, characterized in that, After the cylinder liner and water jacket are finally assembled and fixed to the engine block, remove the positioning parts, or retain the positioning parts and remove the part of the positioning parts exposed on the outer circumference of the water jacket.

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