Assembly method of external thrust stop for engine main shaft

Abstract

The present invention discloses an assembly method for an external thrust stop of an engine main shaft, comprising the following steps: S1: using a process thrust ring to control the axial clearance during the crankshaft assembly process; S2: recording the distance L between the end face of the flywheel end of the engine body and the end face of the crankshaft flange when the crankshaft assembly is completed, and marking the circumferential position of the crankshaft on the end face of the crankshaft body and the circumference of the crankshaft; S3: removing the process thrust ring and continuing the assembly; S4: before assembling the flywheel housing, restoring the distance L and the circumferential position state recorded during the installation of the crankshaft, and making a measuring gauge on the end face of the free end crankshaft flange to realize the transfer of the process reference and control the crankshaft from axial displacement during the assembly of the flywheel housing; the present assembly method for the external thrust stop of the engine main shaft can avoid repeated disassembly and assembly when installing the external thrust stop device, ensure the precise assembly of the engine crankshaft and the external thrust stop device, and greatly improve the installation efficiency and assembly quality.

Description

Technical Field

[0001] The invention relates to the technical field of engine assembly, in particular to an assembly method for an external thrust stop of an engine main shaft. Background Art

[0002] Generally, most common engine crankshaft thrust devices are assembled during the internal installation process. Compared with traditional thrust devices, external thrust devices have the advantages of compact structure, small space occupation, and higher economy.

[0003] The installation position of the external thrust device is on the flywheel housing. The thrust ring is used to control the axial clearance of the crankshaft, and the crankshaft installation is an internal installation process. When the thrust ring is installed, the main bearing cover has been tightened, and the flywheel housing, crankshaft and other components have been assembled. If the flywheel housing is repeatedly disassembled and assembled, it will easily generate axial force on the crankshaft during the reassembly process, causing the axial clearance to change. Repeated disassembly and assembly of the main bearing cover to measure the axial clearance is inefficient and the strong studs of the main bearing cover are easily damaged during the assembly process, resulting in abnormal stress wear of the engine's crankshaft and main bearing, and even a series of serious failures such as shaft seizure that lead to engine scrapping. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide an assembly method for an external thrust stop of an engine main shaft, which can avoid repeated disassembly and assembly when installing the external thrust stop device, ensure the precise assembly of the engine crankshaft and the external thrust stop device, and effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a method for assembling an external thrust stop for an engine main shaft, comprising the following steps:

[0006] S1: Use a process thrust ring to control axial clearance during crankshaft assembly;

[0007] S2: When the crankshaft is assembled, record the distance L between the end face of the flywheel end of the crankshaft body and the end face of the crankshaft flange, and draw lines on the end face of the crankshaft body and the circumference of the crankshaft to record the circumferential position of the crankshaft;

[0008] S3: Remove the process thrust ring and continue assembly;

[0009] S4: Before assembling the flywheel housing, restore the distance L and circumferential position recorded during the crankshaft installation, and make a measuring gauge on the end face of the free end crankshaft flange to achieve the transfer of the process benchmark and control the crankshaft to prevent axial displacement during the assembly of the flywheel housing;

[0010] S5: Install the external thrust ring. The thrust ring is divided into an inner thrust ring and an outer thrust ring. The inner thrust ring is selected to control the axial displacement of the crankshaft. The axial clearance of the crankshaft is controlled to meet the design requirements by replacing the outer thrust ring. Finally, tighten the thrust housing to complete the assembly.

[0011] As a preferred technical solution of the present invention, in step S4, when installing the flywheel housing, a measuring gauge is placed on the free end of the crankshaft and reset to zero, and the flywheel housing is installed and the measuring gauge at the free end of the crankshaft is controlled to always be at zero.

[0012] As a preferred technical solution of the present invention, in step S4, when installing the flywheel housing, the locating pin is installed into the pin hole on the end face of the flywheel housing shaft hole, and the inner thrust ring is positioned and installed on the flywheel housing through the locating pin.

[0013] As a preferred technical solution of the present invention, in step S5, when installing the crankshaft, the axial wheel is fixed on the crankshaft, and the crankshaft locating pin hole and the axial wheel locating pin hole are installed correspondingly.

[0014] As a preferred technical solution of the present invention, in step S5, when the axial clearance changes greatly during the installation of the crankshaft, the axial clearance is kept stable by replacing the inner thrust ring with different thicknesses.

[0015] As a preferred technical solution of the present invention, in step S5, when installing the crankshaft, the outer thrust ring is positioned and installed in the thrust housing by means of a positioning pin.

[0016] As a preferred technical solution of the present invention, when installing the thrust housing in step S5, the thrust housing is installed on the flywheel housing and tightened according to the specified tightening torque, and the crankshaft axial clearance is adjusted to an appropriate range. During the adjustment period, only the outer thrust ring is allowed to be replaced, and the inner thrust ring is not allowed to be adjusted.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) under the premise of ensuring assembly accuracy, there is no need to remove components such as the flywheel housing to repeat the measurement of data during the engine assembly process, thereby preventing process backflow and improving efficiency; (2) avoiding the possibility of damage to the strong studs caused by repeated disassembly and assembly of the main bearing cover, thereby improving the reliability of the entire machine; (3) improving the correlation between the previous and next processes, so that the measurement results of the previous process are verified in the next process, thereby improving the assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the installation of the thrust ring of the process of the present invention;

[0019] Figure 2 This is the structural diagram of the process thrust ring.

[0020] In the figure: 1 process upper thrust ring, 2 process lower thrust ring, L - the distance between the end face of the flywheel end of the body and the end face of the crankshaft flange. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-2 The present invention provides a technical solution: a method for assembling an external thrust stop for an engine main shaft, comprising the following steps:

[0023] S1: First, during the crankshaft installation process, install the process upper thrust ring 1 and the process lower thrust ring 2 on both sides of the first gear bearing cover respectively, measure the crankshaft axial clearance, and control it within the appropriate range;

[0024] S2: Apply appropriate force to the crankshaft to push it to the free end. Record the distance L between the flywheel end face of the crankshaft body and the crankshaft flange end face at this time, and draw a line on the crankshaft body end face and the crankshaft circumference to record the crankshaft circumferential position.

[0025] S3: Remove the process upper thrust ring 1 and the process lower thrust ring 2 and continue assembly;

[0026] S4: Continue the assembly work until the flywheel housing is installed. Turn the crankshaft so that the circumferential direction is aligned with the marking on the engine body. Measure the distance between the end face of the crankshaft flange and the end face of the flywheel on the engine body. Adjust the axial position of the crankshaft so that the distance between the end face of the crankshaft flange and the end face of the flywheel on the engine body is consistent with the distance value L recorded when the crankshaft is installed.

[0027] S5: Install the external thrust ring. The thrust ring is divided into an inner thrust ring and an outer thrust ring. Set the measuring gauge on the free end of the crankshaft and return it to zero. Install the flywheel housing and control the measuring gauge on the free end of the crankshaft to always be at zero. Keep the machine in the same state as when the flywheel housing was installed and continue to assemble the external thrust device.

[0028] During installation, install the locating pin into the pin hole on the end face of the flywheel housing shaft hole, and install the inner thrust ring on the flywheel housing through the locating pin, fix the axial wheel on the crankshaft, and install the crankshaft locating pin hole and the axial wheel locating pin hole in correspondence.

[0029] After fixing, push the crankshaft to the free end. At this time, check the value of the measuring gauge on the free end of the crankshaft to see if there is any change in the axial clearance. If there is no obvious change, you can continue to assemble. If the axial clearance changes significantly, replace the inner thrust ring with different thicknesses to ensure the stability of the axial clearance. Install the outer thrust ring in the thrust housing with the positioning pin;

[0030] Test-assemble the thrust housing, install it on the flywheel housing and tighten the connection according to the specified tightening torque, adjust the crankshaft axial clearance to the appropriate range. During the adjustment period, only the outer thrust ring is allowed to be replaced, and the inner thrust ring is not allowed to be adjusted;

[0031] After the adjustment is completed, tighten all housing fixing bolts according to the specified tightening torque to complete the assembly.

[0032] The present invention uses a process thrust ring to control the crankshaft axial clearance during the internal installation process. At this time, the distance L and the circumferential position between the flywheel end face and the crankshaft flange end face of the engine body are recorded as the reference for subsequent assembly operations. The transfer of the process reference is achieved by marking a measuring gauge on the free end crankshaft flange end face, thereby avoiding the loss of the process reference after the flywheel housing is assembled, avoiding repeated disassembly and assembly that affects the reliability of the entire machine, and ensuring the precise assembly of the engine crankshaft and the external thrust device.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for assembling an external thrust stop for an engine main shaft, characterized in that: The following steps are involved: S1: Use a process thrust ring to control axial clearance during crankshaft assembly; S2: When the crankshaft is assembled, record the distance L between the end face of the flywheel end of the crankshaft body and the end face of the crankshaft flange, and draw lines on the end face of the crankshaft body and the circumference of the crankshaft to record the circumferential position of the crankshaft; S3: Remove the process thrust ring and continue assembly; S4: Before assembling the flywheel housing, restore the distance L and circumferential position recorded during the crankshaft installation, and make a measuring gauge on the end face of the free end crankshaft flange to achieve the transfer of the process benchmark and control the crankshaft to prevent axial displacement during the assembly of the flywheel housing; S5: Install the external thrust ring. The thrust ring is divided into an inner thrust ring and an outer thrust ring. The inner thrust ring is selected to control the axial displacement of the crankshaft. The axial clearance of the crankshaft is controlled to meet the design requirements by replacing the outer thrust ring. Finally, tighten the thrust housing to complete the assembly.

2. The method for assembling an external thrust stop for an engine main shaft according to claim 1, characterized in that: In step S4, when installing the flywheel housing, a measuring gauge is placed on the free end of the crankshaft and reset to zero, and the flywheel housing is installed and the measuring gauge at the free end of the crankshaft is controlled to always be at zero.

3. The method for assembling an external thrust stop for an engine main shaft according to claim 1, characterized in that: In step S4, when installing the flywheel housing, the positioning pin is installed in the pin hole on the end face of the flywheel housing shaft hole, and the inner thrust ring is positioned and installed on the flywheel housing through the positioning pin.

4. The method for assembling an external thrust stop for an engine main shaft according to claim 1, characterized in that: In step S5, when installing the crankshaft, the axial wheel is fixed on the crankshaft, and the crankshaft positioning pin hole and the axial wheel positioning pin hole are installed correspondingly.

5. The method for assembling an external thrust stop for an engine main shaft according to claim 1, characterized in that: In step S5, when the axial clearance changes greatly during the installation of the crankshaft, the axial clearance is kept stable by replacing the inner thrust ring with a different thickness.

6. The method for assembling an external thrust stop for an engine main shaft according to claim 1, characterized in that: In step S5, when installing the crankshaft, the outer thrust ring is positioned and installed in the thrust housing by means of the positioning pins.

7. The method for assembling an external thrust stop for an engine main shaft according to claim 1, characterized in that: When installing the thrust housing in step S5, the thrust housing is installed on the flywheel housing and tightened according to the specified tightening torque, and the crankshaft axial clearance is adjusted to an appropriate range. During the adjustment period, only the outer thrust ring is allowed to be replaced, and the inner thrust ring is not allowed to be adjusted.

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