Diesel engine connecting rod bearing disassembly tool and disassembly method

Abstract

The invention discloses a diesel engine connecting rod bearing disassembly tool, comprising a fixing frame and two inverted T-shaped brackets, wherein the fixing frame comprises a channel steel beam and a Z-shaped curved plate, wherein the channel steel beam is fixed on one side of the frame, one end of the Z-shaped curved plate is welded and fixed on the middle part of the channel steel beam, and the other end is fixed on one side of the large end of the connecting rod that has been moved downward. The inverted T-shaped bracket is symmetrically arranged on both sides of the lower end of the cylinder sleeve, and comprises an inverted T-shaped head and a connecting rod, wherein both ends of the inverted T-shaped head are respectively fixed on both sides of the end surface of the lower end of the cylinder sleeve, and the upper end of the connecting rod abuts against the lower side of the piston pin that has been moved downward. The disassembly and assembly method comprises 1) installing the inverted T-shaped bracket, 2) removing the connecting rod lower end cover and the connecting rod lower bearing to take out the connecting rod upper bearing, 3) removing the fixing frame, and 4) removing the inverted T-shaped bracket. The invention greatly simplifies the disassembly and assembly procedure of the connecting rod bearing of the diesel engine, shortens the maintenance cycle of the diesel engine, reduces the maintenance cost of the diesel engine, and significantly reduces the maintenance workload and the labor intensity of the workers.

Description

Technical Field

[0001] The invention relates to a disassembly tool for a diesel engine transmission component, in particular to a tool and a disassembly method for fixing a diesel engine connecting rod so as to facilitate disassembly of a diesel engine connecting rod bearing, and belongs to the technical field of diesel engine maintenance. Background Art

[0002] Most of the connecting rod bearings of modern diesel engines are replaceable. During the service of the diesel engine, it is often necessary to remove the connecting rod bearings to check their wear. According to the corresponding statistics of the connecting rod bearing inspection, except for a small part that does need to be replaced, most of the connecting rod bearings do not need to be replaced, and they need to be reinstalled in the connecting rod big end cover after removal. The current method of replacing the connecting rod bearing is as follows: first remove the cylinder head, then remove the connecting rod big end cover, and then use a crane to lift the piston and connecting rod from the top of the frame together. The connecting rod body and the crankshaft must be separated before the connecting rod bearing can be replaced. Since the cylinder head needs to be disassembled and removed first, the water, lubricating oil and fuel delivery system of the diesel engine must be disassembled. If there is any negligence or carelessness during the reinstallation process, it is very easy to cause various fluid delivery systems to leak and contaminate the lubricating oil, causing significant economic losses, and the maintenance workload and labor intensity of the workers are very large. Summary of the invention

[0003] The purpose of the present invention is to provide a diesel engine connecting rod bearing disassembly tool and disassembly method which has a simple structure and is efficient and convenient to assemble and disassemble.

[0004] The present invention is achieved through the following technical solutions:

[0005] A diesel engine connecting rod bearing removal tool comprises a fixing frame and two inverted T-shaped brackets, the fixing frame comprises a channel steel crossbeam and a Z-shaped curved plate, the two ends of the channel steel crossbeam are respectively fixed to one side of the frame by fastening screws, one end of the Z-shaped curved plate is welded and fixed to the middle part of the channel steel crossbeam, and the other end of the Z-shaped curved plate is fixed to one side of the large end of the connecting rod that has been moved downward after passing through the frame window; the inverted T-shaped bracket is symmetrically arranged on both sides of the lower end of the cylinder sleeve, and comprises an inverted T-shaped head and a connecting rod, the upper end of the inverted T-shaped head is fixedly connected to the lower end of the connecting rod by connecting screws, the two ends of the inverted T-shaped head are respectively fixed to both sides of the lower end surface of the cylinder sleeve by fastening screws, and the upper end of the connecting rod abuts against the lower side of the piston pin that has been moved downward.

[0006] The purpose of the present invention can be further achieved by the following technical measures.

[0007] Furthermore, one end of the Z-shaped curved plate is a channel steel beam connecting end, and the other end of the Z-shaped curved plate is a connecting rod large end connecting end. The channel steel beam connecting end and the connecting rod large end connecting end are connected by a bending transition portion. The channel steel beam connecting end is welded and fixed to the middle part of the channel steel beam. The angle α between the connecting rod large end connecting end and one end of the transition portion is 88°~92°.

[0008] Furthermore, a positioning block is laterally extended from the lower end of the connecting rod, and the axial upper end of the inverted T-shaped head is positioned with the positioning block through a positioning pin and fixedly connected into one body through a connecting screw.

[0009] Furthermore, the inverted T-shaped bracket is an eccentric structure, and an eccentric distance A is provided between the axis of the inverted T-shaped head and the axis of the connecting rod.

[0010] A disassembly and assembly method using a diesel engine connecting rod bearing disassembly tool comprises the following steps:

[0011] 1) Start the cranking machine and crank the crankshaft forward. Move the piston disc of the cylinder where the connecting rod bearing needs to be replaced to the top dead center. Then fix the two ends of the inverted T-shaped head of the assembled inverted T-shaped bracket symmetrically on both sides of the lower end of the cylinder sleeve so that the upper end of the connecting rod points to the piston pin.

[0012] 2) Start the cranking machine and crank the crankshaft in the reverse direction, so that the piston moves down to the top of the connecting rod of the inverted T-shaped bracket and rests against the two ends of the piston pin respectively; then remove the bolts and fastening nuts connecting the big end of the connecting rod and the lower end cover of the connecting rod, remove the lower end cover of the connecting rod and the lower bearing of the connecting rod, check the lower bearing of the connecting rod and determine whether it needs to be replaced; then fix the channel steel crossbeam of the fixing bracket on one side of the frame, and the connecting end of the big end of the connecting rod at the other end of the Z-shaped curved plate is inserted into the frame window and fixed on one side of the big end of the connecting rod, so that the upper and lower ends of the connecting rod are supported and fixed respectively;

[0013] 3) Start the cranking machine and crank the crankshaft in the reverse direction. The crankshaft rotates slowly to separate the port at the big end of the connecting rod from the corresponding crankshaft neck. Slowly slide the connecting rod upper bearing along the crankshaft neck and remove it. Check the connecting rod upper bearing and determine whether it needs to be replaced.

[0014] 4) Slide the intact connecting rod upper bearing back to the corresponding crankshaft neck, start the cranking machine and crank the crankshaft in the opposite direction, so that the connecting rod big end port is close to the connecting rod upper bearing on the corresponding crankshaft neck; then fix the connecting rod lower bearing and the connecting rod lower end cover to the connecting rod big end port with bolts and fastening nuts, tighten the fastening nuts on the bolts, and then remove the fixing bracket;

[0015] 5) Start the cranking machine and continue to crank the crankshaft in the reverse direction. Push the piston back to the top dead center through the connecting rod. The top of the connecting rod of the inverted T-shaped bracket is separated from the piston pin. Finally, remove the inverted T-shaped bracket.

[0016] The fixing frame and the inverted T-shaped bracket of the present invention have a simple structure, low manufacturing cost, and convenient and quick disassembly and assembly method. The fixing frame and the inverted T-shaped bracket are used to fix the large end of the connecting rod and support the connecting rod pin passing through the small end of the connecting rod, so that the two ends of the connecting rod are relatively fixed, which is very convenient for disassembling or installing the connecting rod upper bearing and the connecting rod lower bearing located on the upper and lower sides of the crankshaft neck respectively. The present invention does not require the cylinder head and the water, lubricating oil and fuel delivery system of the diesel engine to be disassembled and removed, which greatly simplifies the disassembly and assembly procedures of the diesel engine connecting rod bearing, shortens the maintenance cycle of the diesel engine, reduces the maintenance cost of the diesel engine, and significantly reduces the maintenance workload and the labor intensity of the workers.

[0017] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the installation position of the disassembly tool of the present invention;

[0019] Figure 2 yes Figure 1 A-direction view;

[0020] Figure 3 It is a structural diagram of the fixed frame;

[0021] Figure 4 yes Figure 3 Left view of

[0022] Figure 5 It is a structural diagram of an inverted T-shaped bracket;

[0023] Figure 6 yes Figure 5 Top view of the . DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] like Figure 1 to Figure 6 As shown, the diesel engine connecting rod bearing removal tool of this embodiment includes a fixing frame 1 and two inverted T-shaped brackets 2. The fixing frame 1 includes a channel steel beam 11 and a Z-shaped curved plate 12. Both ends of the channel steel beam 11 are fixed to the left side of the frame 10 by fastening screws 13 respectively.

[0026] The left end of the Z-shaped curved plate 12 is a channel steel beam connection end 121, and the right end is a connecting rod big end connection end 122. The channel steel beam connection end 121 and the connecting rod big end connection end 122 are bent and connected by a transition portion 123. The channel steel beam connection end 121 is welded and fixed to the middle of the channel steel beam 11, and the two intersect vertically. The two ends of the channel steel beam 121 are respectively fixed to the right side of the frame 10 by fastening screws 3. The angle α between the connecting rod big end connection end 122 and one end of the transition portion 123 is 90°. The connecting rod big end connection end 122 at the right end of the Z-shaped curved plate 12 penetrates the frame window 101 and is fixed to the left side of the connecting rod big end 201 that has been moved down by fastening screws 13. The 90° included angle α makes the transition portion 123 perpendicular to the left side of the connecting rod big end 201, thereby increasing the supporting force of the Z-shaped curved plate 12 and keeping the connecting rod 20 stably in an inclined state, making it easier to disassemble and assemble the connecting rod upper bearing 30.

[0027] The inverted T-shaped bracket 2 is symmetrically arranged on both sides of the lower end of the cylinder sleeve 30, including an inverted T-shaped head 21 and a connecting rod 22. A positioning block 221 is extended laterally from the lower end of the connecting rod 22. The axial upper end of the inverted T-shaped head 21 is positioned with the positioning block 221 by a positioning pin 23, and is fixedly connected to form a whole by a connecting screw 24. The two ends of the inverted T-shaped head 21 are respectively fixed on both sides of the lower end surface of the cylinder sleeve 30 by a fastening screw 13, and the upper end of the connecting rod 22 is against the lower side of the piston pin 40 that has moved downward. Due to the limitation of the installation position, the axis of the inverted T-shaped head 21 and the axis of the connecting rod 22 cannot be coaxial, and an eccentric distance A is provided between the two. If there is no positioning block 221, the reaction torque of the connecting rod pin 40 on the inverted T-shaped bracket 2 will generate a shear force on the connecting screw 23, which will cause the connecting screw 23 to be sheared after long-term use. Since the positioning block 221 is provided in the present invention, the connecting screw 23 is prevented from being subjected to shear force, thereby improving the reliability of the inverted T-shaped bracket 2.

[0028] A disassembly and assembly method using a diesel engine connecting rod bearing disassembly tool comprises the following steps:

[0029] 1) Start the turning machine and turn the crankshaft 50 in the forward direction. Turn the piston 60 of the cylinder where the connecting rod bearing needs to be replaced to the top dead center. Then fix the two ends of the inverted T-shaped head 21 of the assembled inverted T-shaped bracket 2 symmetrically on both sides of the lower end of the cylinder liner 30 so that the upper end of the connecting rod 22 points to the piston pin 40.

[0030] 2) Start the cranking machine and crank the crankshaft 50 in the reverse direction, so that the piston 60 moves downward until the top of the connecting rod 22 of the inverted T-shaped bracket 2 abuts against the two ends of the piston pin 40. Then remove the bolts and fastening nuts connecting the connecting rod big end 201 and the connecting rod lower end cover, remove the connecting rod lower end cover and the connecting rod lower bearing, check the connecting rod lower bearing and determine whether it needs to be replaced. Then fix the channel steel crossbeam 11 of the fixing frame 1 on the left side of the frame 10, and the connecting rod big end connecting end 122 at the other end of the Z-shaped curved plate 12 is inserted into the frame window 101 and fixed on the left side of the connecting rod big end 201, so that the upper and lower ends of the connecting rod 20 are supported and fixed respectively.

[0031] 3) Start the cranking machine and crank the crankshaft 50 in the reverse direction. The crankshaft 50 rotates slowly to separate the port of the connecting rod big end 201 from the corresponding crankshaft journal 501. Slowly slide the connecting rod upper bearing 70 along the crankshaft journal 501 and remove it. Check the connecting rod upper bearing 70 and determine whether it needs to be replaced.

[0032] 4) Slide the intact connecting rod upper bearing 70 back onto the corresponding crankshaft journal 501, start the cranking machine to crank the crankshaft 50 in the opposite direction, so that the port of the connecting rod big end 201 is close to the connecting rod upper bearing 70 on the corresponding crankshaft journal 501. Then fix the connecting rod lower bearing and the connecting rod lower end cover to the port of the connecting rod big end 201 with bolts and fastening nuts, tighten the fastening nuts on the bolts, and then remove the fixing bracket 1.

[0033] 5) Start the cranking machine and continue to crank the crankshaft 50 in the reverse direction. Push the piston 60 back to the top dead center through the connecting rod 20. The top end of the connecting rod 22 of the inverted T-shaped bracket 2 is separated from the piston pin. Finally, the inverted T-shaped bracket 2 is removed.

[0034] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A diesel engine connecting rod bearing removal tool, Features: It comprises a fixing frame and two inverted T-shaped brackets, the fixing frame comprises a channel steel beam and a Z-shaped curved plate, one end of the Z-shaped curved plate is welded and fixed to the middle part of the channel steel beam, the other end of the Z-shaped curved plate is inserted into the frame window and fixed to one side of the large end of the connecting rod that has been moved down, and the two ends of the channel steel beam are respectively fixed to one side of the frame by fastening screws; the inverted T-shaped bracket is symmetrically arranged on both sides of the lower end of the cylinder sleeve, and comprises an inverted T-shaped head and a connecting rod, the upper end of the inverted T-shaped head is fixedly connected with the lower end of the connecting rod by connecting screws, the two ends of the inverted T-shaped head are respectively fixed to both sides of the lower end surface of the cylinder sleeve by fastening screws, and the upper end of the connecting rod abuts against the lower side of the piston pin that has been moved down; One end of the Z-shaped curved plate is a connecting end of a channel steel beam, and the other end of the Z-shaped curved plate is a connecting end of a connecting rod. The connecting end of the channel steel beam and the connecting end of the connecting rod are bent and connected by a transition portion. The connecting end of the channel steel beam is welded and fixed to the middle part of the channel steel beam. The angle α between the connecting end of the connecting rod and one end of the transition portion is 88° to 92°. A positioning block extends laterally from the lower end of the connecting rod, and the axial upper end of the inverted T-shaped head is positioned with the positioning block by a positioning pin and fixedly connected into one by a connecting screw; the inverted T-shaped bracket is an eccentric structure, and an eccentric distance A is provided between the axis of the inverted T-shaped head and the axis of the connecting rod.

2. A disassembly and assembly method using the diesel engine connecting rod bearing disassembly tool as claimed in claim 1, Features: The following steps are involved: 1) Start the cranking machine and crank the crankshaft forward. Move the piston disc of the cylinder where the connecting rod bearing needs to be replaced to the top dead center. Then fix the two ends of the inverted T-shaped head of the assembled inverted T-shaped bracket symmetrically on both sides of the lower end of the cylinder sleeve so that the upper end of the connecting rod points to the piston pin. 2) Start the cranking machine and crank the crankshaft in the reverse direction, so that the piston moves down to the top of the connecting rod of the inverted T-shaped bracket and rests against the two ends of the piston pin respectively; then remove the bolts and fastening nuts connecting the big end of the connecting rod and the lower end cover of the connecting rod, remove the lower end cover of the connecting rod and the lower bearing of the connecting rod, check the lower bearing of the connecting rod and determine whether it needs to be replaced; then fix the channel steel crossbeam of the fixing bracket on one side of the frame, and the connecting end of the big end of the connecting rod at the other end of the Z-shaped curved plate is inserted into the frame window and fixed on one side of the big end of the connecting rod, so that the upper and lower ends of the connecting rod are supported and fixed respectively; 3) Start the cranking machine and crank the crankshaft in the reverse direction. The crankshaft rotates slowly to separate the connecting rod big end port from the corresponding crankshaft neck. Slowly slide the connecting rod upper bearing along the crankshaft neck and remove it. Check the connecting rod upper bearing and determine whether it needs to be replaced. 3) Slide the intact connecting rod upper bearing back to the corresponding crankshaft neck, start the cranking machine and crank the crankshaft in the opposite direction, so that the connecting rod big end port is close to the connecting rod upper bearing on the corresponding crankshaft neck; then fix the connecting rod lower bearing and the connecting rod lower end cover to the connecting rod big end port with bolts and fastening nuts, tighten the fastening nuts on the bolts, and then remove the fixing bracket; 5) Start the cranking machine and continue to crank the crankshaft in the reverse direction. Push the piston back to the top dead center through the connecting rod. The top of the connecting rod of the inverted T-shaped bracket is separated from the piston pin. Finally, remove the inverted T-shaped bracket.

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