Crankshaft oil pressure test device assembly of medium-high speed diesel engine

Abstract

The utility model discloses an oil pressure test device assembly for a crankshaft of a medium-high speed diesel engine. The oil pressure test device assembly comprises a crankshaft, a main journal oil hole sealing device, a crank journal oil hole sealing device and an oil hole sealing device with an oil duct, an oil hole sealing device with an oil duct seals a starting main journal oil hole, a main journal oil hole sealing device seals all the remaining main journal oil holes except the starting main journal oil hole, and a crank journal oil hole sealing device seals a crank journal oil hole. The high-speed diesel engine crankshaft oil pressure test device assembly can improve oil pressure test stability and test efficiency, and is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil pressure testing, and in particular relates to an oil pressure testing device assembly for a crankshaft of a medium- and high-speed diesel engine. Background Art

[0002] The crankshaft is the heart of a medium- and high-speed diesel engine. Its quality determines the performance of the diesel engine. When the diesel engine is running, the crankshaft is subject to a very high load, and its oil pressure lubrication system is very critical. At present, there are many types of medium- and high-speed marine crankshafts with different sizes and narrow journal widths. When doing oil pressure tests, the space for installing the sealing device is small, and whether there is interference and operability must be considered; and the sealing oil pressure is high, and the metal parts of the sealing device are not allowed to contact the product. Summary of the invention

[0003] The utility model aims to overcome the deficiencies of the prior art and provides a medium- and high-speed diesel engine crankshaft oil pressure test device assembly which can improve the oil pressure test stability and test efficiency.

[0004] To achieve the above-mentioned purpose, the utility model provides a medium- and high-speed diesel engine crankshaft oil pressure test device assembly, including a crankshaft, a main shaft neck oil hole sealing device, a crank neck oil hole sealing device and an oil hole sealing device with an oil channel; the oil hole sealing device with an oil channel seals the starting main shaft neck oil hole, the main shaft neck oil hole sealing device seals all remaining main shaft neck oil holes except the starting main shaft neck oil hole, and the crank neck oil hole sealing device seals the crank neck oil hole.

[0005] Furthermore, the main journal oil hole sealing device includes a U-shaped arm and a sealing adjustment device respectively arranged on the two end surfaces of the U-shaped arm, each set of sealing adjustment device includes a screw seat with an internal threaded hole, an adjusting bolt, a sealing plug and a sealing ring; the screw seat with the internal threaded hole is welded at the end surface of the U-shaped arm, one end surface of the sealing plug is provided with a stop matched with the end of the adjusting bolt, and the other end surface of the sealing plug is provided with a boss facing outward, the axial center line of the boss, the axial center line of the internal threaded hole of the screw seat and the axial center line of the main journal oil channel are colinear, and the sealing ring is sleeved in the annular groove of the boss; the adjusting bolt is screwed into the internal threaded hole until it passes through the internal threaded hole and matches with the stop gap of one end surface of the sealing plug, and the boss on the other end surface of the sealing plug is inserted into the oil hole of the main journal until the sealing ring is tightly fitted with the edge of the orifice of the oil hole.

[0006] Furthermore, the end dimension of the boss is slightly smaller than the diameter of the oil hole.

[0007] Furthermore, the structure of the crank neck oil hole sealing device is the same as that of the main shaft neck oil hole sealing device; in the main shaft neck oil hole sealing device, the width of the inner groove of the U-shaped arm is greater than the main shaft neck diameter, and the height of the inner groove is greater than the main shaft neck radius; in the crank neck oil hole sealing device, the width of the inner groove of the U-shaped arm is greater than the crank neck diameter, and the height of the inner groove is greater than the crank neck radius.

[0008] Furthermore, one of the sealing adjustment devices of the oil hole sealing device with an oil channel is a sealing adjustment device with an oil channel, and the sealing adjustment device with an oil channel comprises an oil filling sealing plug and an oil filling adjusting bolt; a stopper is provided on one end face of the oil filling sealing plug, and a boss is extended outwardly from the other end face for the sealing ring to be sleeved, and an axial plug oil channel is provided to penetrate the oil filling sealing plug, and the axial center line of the stopper, the axial center line of the boss and the axial center line of the plug oil channel coincide with the axial center line of the main journal oil channel; a bolt oil channel is provided to penetrate the oil filling adjusting bolt axially, and the axial center line of the bolt oil channel coincides with the axial center line of the starting main journal oil channel; the flange at one end of the oil filling adjusting bolt is clearance-matched with the stopper of the oil filling sealing plug, and the outlet end at the other end is matched with the oil pump oil pipe interface.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows: the medium- and high-speed diesel engine crankshaft oil pressure test device assembly of the utility model can improve the oil pressure test stability and test efficiency, and has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the assembly structure of the medium- and high-speed diesel engine crankshaft oil pressure test device of the utility model;

[0011] Figure 2 for Figure 1 Schematic diagram of the structure of the oil hole sealing device of the middle main journal;

[0012] Figure 3 for Figure 2 Schematic diagram of the middle sealing plug structure;

[0013] Figure 4 for Figure 1 Schematic diagram of the structure of the oil hole sealing device with oil channel in the middle belt;

[0014] Figure 5 for Figure 4 Schematic diagram of the oil filling adjustment bolt structure;

[0015] Figure 6 for Figure 4 Schematic diagram of the structure of the center oil-filled sealing plug. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below in conjunction with specific embodiments to facilitate a clearer understanding of the present invention, but they do not constitute a limitation on the present invention.

[0017] like Figure 1The high-speed diesel engine crankshaft oil pressure test device assembly shown includes a crankshaft, a main journal oil hole sealing device 10, a crank neck oil hole sealing device 9 and an oil hole sealing device 8 with an oil channel; wherein the oil hole sealing device 8 with an oil channel seals the starting main journal oil hole, the main journal oil hole sealing device 10 seals all remaining main journal oil holes except the starting main journal oil hole, and the crank neck oil hole sealing device 9 seals the crank neck oil hole.

[0018] Combination Figure 2 , 3 The main journal oil hole sealing device 10 shown includes a U-shaped arm 1 and sealing adjustment devices respectively arranged on the two end surfaces of the U-shaped arm 1, each set of sealing adjustment devices includes a screw seat 2 with an internal threaded hole, an adjusting bolt 3, a sealing plug 4 and a sealing ring 5; the screw seat 2 with an internal threaded hole is welded at the end surface of the U-shaped arm 1, one end surface of the sealing plug 4 is provided with a stop 11 that matches the end of the adjusting bolt 3, and the other end surface of the sealing plug 4 is provided with a boss 12 outward, and the axial center line of the boss 12, the axial center line of the internal threaded hole of the screw seat 2 and the axial center line of the main journal oil channel are collinear; the sealing ring 5 is sleeved in the annular groove 13 of the boss 12, and the end size of the boss 12 is slightly smaller than the oil hole diameter, which is conducive to the smooth assembly of the boss and the positioning and sealing of the sealing ring. The adjusting bolt 3 is screwed into the internal thread hole until it passes through the internal thread hole and then fits with the stopper 11 on one end of the sealing plug 4, which is conducive to releasing the deformation; the boss 12 on the other end of the sealing plug 4 is inserted into the oil hole of the main shaft neck until the sealing ring 5 fits tightly with the edge of the oil hole to achieve the sealing effect. The thrust force of the adjusting bolts of the sealing adjustment device on both end surfaces of the U-shaped arm 1 is opposite and concentric, and the center of the extrusion force generated coincides, which better achieves sealing.

[0019] The structure of the crank neck oil hole sealing device 9 is the same as that of the main shaft neck oil hole sealing device 10, with the only difference being that: in the main shaft neck oil hole sealing device, the width of the inner groove of the U-shaped arm 1 is greater than the main shaft neck diameter, and the height of the inner groove is greater than the main shaft neck radius, so as to avoid interference with the outer circle of the main shaft neck; in the crank neck oil hole sealing device, the width of the inner groove of the U-shaped arm 1 is greater than the crank neck diameter, and the height of the inner groove is greater than the crank neck radius, so as to avoid interference with the outer circle of the crank neck.

[0020] The structure of the oil hole sealing device with oil passage is different from that of the main journal oil hole sealing device in that one of the sealing adjustment devices is a sealing adjustment device with oil passage. Figure 4 , 5As shown in , 6, the sealing plug 4 is an oil-filled sealing plug 7, and the adjusting bolt is an oil-filled adjusting bolt 6; the oil-filled sealing plug 7 has a stopper on one end face, and a boss on the other end face extends outwardly for the sealing ring to be placed, and an axial plug oil passage 17 is opened through the oil-filled sealing plug, and the axial center line of the stopper, the axial center line of the boss and the axial center line of the plug oil passage coincide with the axial center line of the main journal oil passage. The oil-filled adjusting bolt 6 has a bolt oil passage 15 opened through the oil-filled adjusting bolt axially, and the axial center line of the bolt oil passage 15 coincides with the axial center line of the starting main journal oil passage; the flange 14 at one end of the oil-filled adjusting bolt 6 is in clearance fit with the stopper of the oil-filled sealing plug 7, and the outlet end at the other end is in fit with the oil pump oil pipe interface, and the outer side of the oil-filled adjusting bolt has a flat square 16, which is convenient for operating the oil pipe.

[0021] During the oil pressure test, after the crank neck oil hole sealing device and the main shaft neck oil hole sealing device are assembled, they are inserted into the crank neck and the main shaft neck respectively, so that the sealing plug of the sealing adjustment device is located at the oil hole position; the adjusting bolt is adjusted to insert the boss of the sealing joint into the oil hole until the sealing ring fits tightly with the edge of the oil hole; the oil holes of the same oil channel are sealed one by one, and one oil hole is reserved without being pressed;

[0022] Use the same method to install the oil hole sealing device with oil channel at the oil hole of the starting main shaft neck, adjust the adjusting bolt and the oil filling adjusting bolt to insert the boss of the sealing joint and the oil filling sealing joint into the oil hole until the sealing ring fits tightly with the edge of the oil hole;

[0023] Connect the oil pipe, connect the hydraulic valve, adjust the hydraulic valve according to the specified oil pressure, start pressurizing, wait for the medium to flow out of the reserved unpressurized oil hole for 1 minute, tighten the adjusting bolt at the oil hole to seal the oil hole. Finally, maintain the pressure for the specified time, verify whether there is leakage in the sealing parts of the crankshaft, and ensure that the oil holes in the same oil circuit are sealed and the oil circuit is unobstructed.

Claims

1. A medium- and high-speed diesel engine crankshaft oil pressure test device assembly, comprising a crankshaft, characterized in that: It also includes a main journal oil hole sealing device (10), a crank journal oil hole sealing device (9) and an oil hole sealing device with an oil passage (8); the oil hole sealing device with an oil passage (8) seals the starting main journal oil hole, the main journal oil hole sealing device (10) seals all remaining main journal oil holes except the starting main journal oil hole, and the crank journal oil hole sealing device (9) seals the crank journal oil hole.

2. The medium- and high-speed diesel engine crankshaft oil pressure test device assembly according to claim 1 is characterized in that: The main journal oil hole sealing device (10) comprises a U-shaped arm (1) and sealing adjustment devices respectively arranged on the two end surfaces of the U-shaped arm (1), each set of sealing adjustment devices comprises a screw seat (2) with an internal thread hole, an adjustment bolt (3), a sealing plug (4) and a sealing ring (5); the screw seat (2) with an internal thread hole is welded to the end surface of the U-shaped arm (1), one end surface of the sealing plug (4) is provided with a stopper (11) matched with the end of the adjustment bolt (3), and the other end surface of the sealing plug (4) is outwardly The boss (12), the axial center line of the boss (12), the axial center line of the internal threaded hole of the screw seat (2) and the axial center line of the main journal oil passage are all in a straight line, and the sealing ring (5) is sleeved in the annular groove (13) of the boss (12); the adjusting bolt (3) is screwed into the internal threaded hole until it passes through the internal threaded hole and is gap-matched with the stopper (11) on one end face of the sealing plug (4), and the boss (12) on the other end face of the sealing plug (4) is inserted into the oil hole of the main journal until the sealing ring (5) is tightly fitted with the edge of the oil hole.

3. The medium- and high-speed diesel engine crankshaft oil pressure test device assembly according to claim 2 is characterized in that: The end dimension of the boss (12) is slightly smaller than the diameter of the oil hole.

4. The medium- and high-speed diesel engine crankshaft oil pressure test device assembly according to claim 2 is characterized in that: The structure of the crank neck oil hole sealing device (9) is the same as that of the main shaft neck oil hole sealing device (10); in the main shaft neck oil hole sealing device, the width of the inner groove of the U-shaped arm (1) is greater than the main shaft neck diameter, and the height of the inner groove is greater than the main shaft neck radius; in the crank neck oil hole sealing device, the width of the inner groove of the U-shaped arm (1) is greater than the crank neck diameter, and the height of the inner groove is greater than the crank neck radius.

5. The medium- and high-speed diesel engine crankshaft oil pressure test device assembly according to claim 2 is characterized in that: One of the sealing adjustment devices of the oil hole sealing device with oil passage is a sealing adjustment device with oil passage, and the sealing adjustment device with oil passage comprises an oil filling sealing plug (7) and an oil filling adjustment bolt (6); a stopper is formed on one end surface of the oil filling sealing plug (7), a boss is extended outwardly on the other end surface for the sealing ring to be sleeved, and a plug oil passage (17) is axially formed to penetrate the oil filling sealing plug, and the axial center line of the stopper, the axial center line of the boss and the axial center line of the plug oil passage coincide with the axial center line of the main journal oil passage; a bolt oil passage (15) is axially formed to penetrate the oil filling adjustment bolt, and the axial center line of the bolt oil passage (15) coincides with the axial center line of the starting main journal oil passage; a flange (14) at one end of the oil filling adjustment bolt (6) is clearance-matched with the stopper of the oil filling sealing plug (7), and the outlet end at the other end is matched with the oil pump oil pipe interface.

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