Simple and convenient sleeve dismounting tool and method for ignition fuel injector

Abstract

The invention discloses a simple sleeve disassembling tool and method for a fuel injector. The tool comprises a lead screw, a cross beam, a lead screw nut, a tension block, a round pin and a bolt. Wherein the cross beam is fixed on the cylinder cover above the mounting hole, the screw rod sequentially penetrates through a central hole of the cross beam and an inner hole of the bushing from top to bottom, and the lower end of the screw rod extends out of the lower part of the bushing; the tension block is hinged to the lower portion of the lead screw through a round pin, the lead screw nut is rotated on the lead screw around the round pin to be connected to the lead screw, the tension block and the lead screw are connected in a 90-degree mode and penetrate through an inner hole of the lining from top to bottom, then the tension block rotates by 90 degrees by means of gravity and is coaxial with the lead screw, the lead screw nut rotates and pulls the lead screw upwards through threads by means of the cross beam, and the tension block and the lead screw are connected in a 90-degree mode. The upper plane of the tension block is tightly attached to the lower end face of the lining through the peripheral part, the lead screw continues to move upwards, force is applied through the tension block, the lining is pulled upwards, interference friction force between the lining and the mounting hole is overcome, and the lining is detached from the mounting hole of the cylinder cover. The cylinder cover does not need to be dismantled from the main engine, and the effects of improving the operation efficiency, shortening the maintenance time and reducing the production cost are achieved.

Description

Technical Field

[0001] The invention relates to an assembly process of a marine dual-fuel diesel engine, in particular to a simple disassembly tool and method for a pilot oil injector, and belongs to the technical field of marine diesel engine manufacturing. Background Art

[0002] With the development of marine diesel engine technology and increasingly stringent international environmental protection requirements, marine dual-fuel main engines have gradually become the leaders in the shipping industry. The pilot fuel injector is a key component of marine dual-fuel diesel engines. It is installed on the cylinder head of the main engine. The function of the pilot fuel injector is to inject pilot fuel into the combustion chamber and ignite it, and then ignite the compressed fuel gas in the cylinder liner. After the fuel gas burns and expands, it pushes the piston to reciprocate in the cylinder liner, thereby achieving work.

[0003] See also Figure 1 The pilot oil injector is installed in the mounting hole B on the cylinder head A. The mounting hole B is a multi-step hole, including a large hole B1 and a small hole B2 connected to each other. The small hole B2 is located at the bottom of the mounting hole B. The top of the cylinder head A is provided with a screw hole F for installing the pilot oil injector. Since the working temperature of the pilot oil injector is extremely high, in order to cool the pilot oil injector during operation, a bushing C is provided between the mounting hole B and the pilot oil injector to construct a cavity D for circulating cooling water to cool the pilot oil injector. The cavity D must be a sealed space to prevent circulating cooling water from entering the combustion chamber. Figure 1 The bushing C shown is installed in the mounting hole B of the cylinder head A, and the pilot oil injector is installed in the inner hole of the bushing C. The bushing C is a stepped sleeve member, including a large-diameter sleeve C1 and a small-diameter sleeve C2 connected to each other; the small-diameter sleeve C2 is installed in the small hole B2 at the bottom of the mounting hole B by a cold-fitting process, and the outer circle forms an interference fit with the inner wall of the small hole B2 to achieve a sealing effect; the large-diameter sleeve C1 is accommodated in the large hole B1 of the mounting hole B, and a cavity D for circulating cooling water is formed between the outer circle and the inner wall of the large hole B1, and a sealing ring E is arranged between the outer periphery of the upper part of the large-diameter sleeve C1 and the inner wall of the large hole B1, so as to work together with the interference fit structure at the bottom to completely seal the cavity D to prevent the circulating cooling water from leaking into the combustion chamber.

[0004] After a period of operation, the marine dual-fuel main engine needs maintenance and overhaul. When the pilot oil injector needs to be overhauled and the bushing needs to be replaced, the bushing needs to be removed from the pilot oil injector mounting hole of the cylinder head. Since the small hole at the bottom of the mounting hole and the small diameter sleeve of the bushing are interference-fitted, the force is relatively large, so the bushing is difficult to disassemble and assemble.

[0005] At present, the traditional bushing removal operation is carried out with the help of removal tools. Figure 2The disassembly tool includes a gland 01, a liner 02, a tension screw 03 and a connecting bolt 04. The gland 01 is fixed to the opening of the mounting hole B of the cylinder head A through the connecting bolt 04 and the screw hole F. The tension screw 03 is connected to the gland 01 through a thread and passes through the mounting hole B and the bushing C, and extends from the bottom of the small-diameter sleeve C2; ​​the liner 02 is connected to the bottom end of the tension screw 03 and is a stepped cylindrical structure. The small cylinder at the top is inserted into the inner hole of the small-diameter sleeve C2, and the diameter of the large cylinder at the bottom is larger than the inner diameter of the small-diameter sleeve C2 and slightly smaller than the outer diameter of the small-diameter sleeve C2. The liner 02 is milled with an open T-slot for inserting the boss at the bottom end of the tension screw 03 to connect the tension screw 03. Since the large cylindrical diameter of the liner 02 is larger than the inner diameter of the small diameter sleeve C2, it cannot pass through the inner hole of the bushing C and be placed under the bushing C. Therefore, the bushing removal operation must first remove the entire cylinder head A or the exhaust valve on the cylinder head A, and then the disassembly tooling can be installed in place.

[0006] The conventional bushing disassembly process is as follows: Figure 2 : First, remove the cylinder head A from the main engine, fix the pressure cover 01 with the tension screw 03 screwed on it to the cylinder head A through the connecting bolts 04, and make the tension screw 03 pass through the inner hole of the bushing C, and the bottom end extends out of the small-diameter sleeve C2, and then insert the liner 02 into the bottom end of the tension screw 03 and install it inside the cylinder head A; rotate the tension screw 03 to drive the small cylinder of the liner 02 to enter the inner hole of the small-diameter sleeve C2, and the end face of the large cylinder is close to the bottom surface of the small-diameter sleeve C2; ​​continue to rotate the tension screw 03, with the help of the top force of the fixed pressure cover 01, pull the entire bushing C through the liner 02, overcome the interference friction between the small-diameter sleeve C2 and the small hole B2, and remove the bushing C from the mounting hole B of the cylinder head A.

[0007] The above-mentioned traditional method of bushing removal has a great defect. Due to the limitation of the structure of the removal tool, the removal tool cannot be directly installed in the installation hole of the pilot oil injector. Instead, the entire cylinder head must be removed before the removal tool can be installed in place to perform bushing removal. This makes the entire removal process cumbersome and the engineering workload huge. It not only consumes a lot of man-hours, but also requires a lot of equipment resources, which not only prolongs the production cycle and increases the process cost, but also the removal of the cylinder head will lead to unnecessary quality risks. In short, the existing bushing removal device and method have the defects of high cost, long cycle and high risk. Summary of the invention

[0008] The object of the present invention is to provide a simple sleeve removal tool and method for a pilot oil injector, wherein the removal tool is directly inserted into the inner hole of the sleeve to complete the sleeve removal operation without removing the cylinder head from the main engine, thereby simplifying the operation process and facilitating the operation, thereby achieving the effects of improving operation efficiency, shortening maintenance time, reducing production costs, and ensuring product quality.

[0009] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0010] A simple disassembly tool for a pilot oil injector, wherein the pilot oil injector is installed in a mounting hole of a cylinder head, a small hole is provided at the bottom of the mounting hole, a bushing is installed between the pilot oil injector and the mounting hole, a small diameter sleeve at the bottom of the bushing forms an interference fit with the small hole, and a screw hole for installing the pilot oil injector is provided on the top of the cylinder head; the characteristic is that the simple disassembly tool comprises a screw rod, a crossbeam, a screw rod nut, a tension block, a round pin and a bolt;

[0011] The crossbeam is fixed to the cylinder head above the opening of the mounting hole through the bolts and screw holes, a center hole is provided in the center of the crossbeam, and a countersunk hole is provided concentrically with the center hole;

[0012] The screw rod is a round rod-type component, with threads on the outer circumference, and a semicircular arc head and a flat portion at the lower end for connecting with the tension block, and the flat portion is provided with a hinge hole. The screw rod passes through the center hole of the beam and the inner hole of the bushing from top to bottom, and the lower end extends out from the bottom of the small-diameter sleeve;

[0013] The tension block includes a base plate, two hinged ear plates are vertically extended upward from the upper plane of the base plate, an open groove is formed between the two hinged ear plates for accommodating the flat part of the screw rod, and horizontal pin holes are coaxially opened on the two hinged ear plates. The tension block is hinged to the flat part of the lower end of the screw rod through the round pin and can rotate on the screw rod around the round pin. The peripheral part of the upper plane is in close contact with the lower end surface of the small-diameter sleeve. When the tension block rotates to a position where its symmetry center line forms a 90° position with the axis of the screw rod, it can pass through the inner hole of the small-diameter sleeve at the lower part of the bushing together with the screw rod;

[0014] The screw nut is connected to the screw by threads and penetrates into the countersunk hole.

[0015] Furthermore, U-shaped grooves for connecting the bolts are provided on both sides of the crossbeam.

[0016] Furthermore, the distance between the two hinged ear plates is greater than the thickness of the flat portion of the screw rod.

[0017] Furthermore, the radius of the arc head of the screw rod is equal to 1 / 2 of the diameter of the screw rod and is smaller than the distance between the center of the pin hole of the tension block and the upper plane of the base plate.

[0018] Furthermore, the tension block at least meets the following minimum conditions: the height of the tension block is smaller than the inner diameter of the small-diameter sleeve, and the diameter of the screw rod is smaller than the height of the hinged ear plate.

[0019] Furthermore, the length of the tension block is greater than the inner diameter of the small-diameter sleeve and smaller than the outer diameter of the small-diameter sleeve.

[0020] Furthermore, the outer diameter of the screw nut is greater than the diameter of the central hole of the crossbeam.

[0021] Furthermore, the round pin has a clearance fit with the hinge hole and an interference fit with the pin hole.

[0022] Another technical solution of the present invention is as follows:

[0023] A method for removing the sleeve of a pilot oil injector implemented by using the above-mentioned simple sleeve removal tool is characterized in that: the tension block and the screw rod are connected at 90° to each other, and pass through the inner hole of the bushing and its small-diameter sleeve from top to bottom, and then the tension block rotates 90° by gravity to be coaxial with the screw rod, and the screw rod nut rotates and relies on the crossbeam fixed on the cylinder head to pull the screw rod upward through the thread, so that the upper plane of the tension block is tightly attached to the lower end surface of the small-diameter sleeve with the peripheral part, and the screw rod continues to move upward, and the force is applied by the tension block to pull the bushing upward, thereby overcoming the interference friction between the small-diameter sleeve and the small hole, and removing the bushing from the mounting hole of the cylinder head.

[0024] Furthermore, the disassembly method comprises the following specific steps:

[0025] 1) The screw rod is passed through the center hole of the cross beam from top to bottom with the arc head facing downward, and the screw rod nut is screwed onto the thread of the screw rod above the cross beam;

[0026] 2) embed the arc head and the flat part of the screw rod between the two hinged ear plates of the tension block, insert the round pin into the pin hole and the hinge hole, hinge the tension block to the lower end of the screw rod, and rotate the tension block until its symmetry center line forms a 90° position with the axis of the screw rod;

[0027] 3) fixing the crossbeam to the cylinder head above the opening of the mounting hole through the bolts and screw holes;

[0028] 4) The tension block and the screw rod connected at 90° to each other are passed through the inner hole of the bushing and its small-diameter sleeve from top to bottom, and then the tension block is rotated 90° by gravity to be coaxial with the screw rod;

[0029] 5) Rotate the screw nut to be close to the crossbeam, pull the screw and the tension block upward through the thread, so that the peripheral portion of the upper plane of the tension block is close to the lower end surface of the small-diameter sleeve;

[0030] 6) Continue to rotate the screw nut, the screw pulls the bushing upward through the tension block, overcomes the interference friction between the small-diameter sleeve and the small hole, and pulls out the bushing, thereby completing the installation of the sleeve removal tool from the top of the cylinder head and realizing the disassembly operation of the bushing of the pilot oil injector.

[0031] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0032] The present invention realizes that, without removing the cylinder head or the exhaust valve, a sleeve removal tool with a larger inner diameter than the sleeve can be directly inserted into the sleeve, and the sleeve of the pilot oil injector can be removed, thereby saving the work hours originally required for disassembling the cylinder head when repairing the pilot oil injector, greatly shortening the maintenance period of the marine dual-fuel main engine, simplifying the sleeve removal operation, reducing the production cost, and ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the pilot fuel injector mounting holes and bushings.

[0034] Figure 2 This is a schematic diagram of the traditional bushing removal method.

[0035] Figure 3 It is a structural schematic diagram of the present invention.

[0036] Figure 4 yes Figure 3 Top view of the .

[0037] Figure 5 It is a partial cross-sectional view of the connection between the screw rod and the liner.

[0038] Figure 6 It is a schematic diagram of the liner being rotated 90°.

[0039] Figure 7 It is a schematic diagram of the screw rod.

[0040] Figure 8 This is the front view of the screw.

[0041] Fig. 9 yes Figure 8 Top view of the .

[0042] Fig.10 It is a schematic diagram of the lining block.

[0043] Fig.11 This is the front view of the lining block.

[0044] Fig.12 yes Fig.11 Left view of .

[0045] Fig.13 yes Fig.11 Top view of the .

[0046] Fig.14 is a schematic diagram of the beam.

[0047] Fig.15 It is a schematic diagram of the lead screw nut.

[0048] Fig.16 It is the working state of the present invention.

[0049] In the figure, A—cylinder head, B—mounting hole, B1—large hole, B2—small hole, C—bushing, C1—large diameter sleeve, C2—small diameter sleeve, D—chamber, E—sealing ring, F—screw hole, 01—pressure cover, 02—bushing block, 03—tension screw rod, 04—connecting bolt, 1—screw rod, 11—thread, 12—arc head, 13—flat part, 14—hinge hole, 15—hexagonal head, 2—crossbeam, 21—center hole, 22—U-shaped groove , 23—counterbore, 3—screw nut, 4—tension block, 41—base plate, 42—hinge ear plate, 43—upper plane of base plate, 44—pin hole, 5—round pin, 6—bolt, d1—diameter of screw, d4—length of tension block, w4—distance between two hinged ear plates, h4—height of tension block, s4—distance between the center of pin hole and the upper plane of base plate, r1—radius of arc head, t4—height of hinged ear plate, w1—thickness of flat part. DETAILED DESCRIPTION

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention shall not be limited thereby.

[0051] The present invention is used for disassembly of the fuel injector bushing of a marine dual-fuel diesel engine. Figure 1 The pilot oil injector is installed in the mounting hole B of the cylinder head A. A small hole B2 is provided at the bottom of the mounting hole B. A bushing C is installed between the pilot oil injector and the mounting hole B. A small diameter sleeve C2 is provided at the lower part of the bushing C. The small diameter sleeve C2 forms an interference fit with the small hole B2. A screw hole F for mounting the pilot oil injector is provided on the top of the cylinder head A.

[0052] Please refer to Figure 3 and Figure 4The disassembly tool shown in the figure includes a screw 1, a crossbeam 2, a screw nut 3, a tension block 4, a round pin 5 and a bolt 6.

[0053] The two bolts 6 are screwed into the screw holes F of the cylinder head A to fix the crossbeam 2 on the cylinder head A above the opening of the mounting hole B, so as to bear the disassembly force of the bushing C transmitted by the screw rod 1. Fig.14 A center hole 21 is provided in the center of the crossbeam 2 for passing the screw rod 1, and a countersunk hole 23 is provided concentrically with the center hole 21 for accommodating and positioning the screw rod nut 3 to prevent the screw rod nut 3 from radial displacement when subjected to force; U-shaped grooves 22 are provided on both sides of the crossbeam 2 for connecting the bolts 6.

[0054] Please refer to Figure 7 , Figure 8 and Fig. 9 The screw rod 1 is a round rod-type component, with a thread 11 on the outer circumference, a hexagonal head 15 on the upper end, and a semicircular arc head 12 on the lower end. Two parallel planes are milled along the axial direction on both sides of the arc head 12. A flat portion 13 is formed at the lower end of the screw rod 1 to connect with the tension block 4. A through hinge hole 14 is drilled radially in the center of the flat portion 13 to insert the round pin 5. The round pin 5 and the hinge hole 14 are clearance-matched. The screw rod 1 passes through the center hole 21 of the beam 2 and the inner hole of the bushing C from top to bottom, and the lower end extends below the small-diameter sleeve C2.

[0055] Please refer to Figure 3 , Figure 5 and Figure 6 The tension block 4 is hinged to the flat portion 13 at the lower end of the screw rod 1 through the round pin 5, and can rotate around the round pin 5 on the flat portion 13 of the screw rod 1. When the tension block 4 rotates to a position where its symmetry center line is 90° with the axis of the screw rod 1, Figure 6 , can pass through the inner hole of the small-diameter sleeve C2 at the lower part of the bushing C together with the screw rod 1, so as to realize the installation of the sleeve removal tool from the top of the cylinder head A.

[0056] Please refer to Fig.10 , Fig.11 , Fig.12 and Fig.13The tension block 4 is a truncated cone-shaped component that is thin at the top and thick at the bottom. The upper conical structure facilitates guidance in the bushing C. The tension block 4 includes a short cylindrical base plate 41, and two hinged ear plates 42 extend vertically upward from the upper plane 43 of the base plate 41 to connect with the screw 1. An open groove is formed between the two hinged ear plates 42 to accommodate the flat portion 13 of the screw 1. The two hinged ear plates 42 are coaxially provided with horizontal pin holes 44 to insert the round pin 5. The round pin 5 and the pin hole 44 are in a tight fit. At the end of the processing of the tension block 4, the outer shape needs to be milled according to the corresponding arc trajectory, see Fig.12 and Fig.13 , so as to reduce the possibility of interference when passing through the inner hole of the small-diameter sleeve C2.

[0057] When the tension block 4 passes through the inner hole of the small-diameter sleeve C2 together with the screw rod 1 at a 90° position, the tension block 4 rotates by gravity and returns to a position where the symmetry center line is coaxial with the axis of the screw rod 1. Figure 3 Then, on the upper plane 43 of the tension block 4, the peripheral portion outside the hinged ear plate 42 is tightly attached to the lower end surface of the small-diameter sleeve C2 to apply force upward to realize the removal of the bushing C.

[0058] In order to enable the tension block 4 to be smoothly installed on the screw rod 1, and to rotate 90° to achieve Figure 6 In the position shown, the distance w4 between the two hinged ear plates 42 is greater than the thickness w1 of the flat portion 13 of the screw rod 1, that is, w4>w1. Fig. 9 and Fig.12 ; The radius r1 of the arc head 12 of the screw rod 1 is equal to 1 / 2 of the diameter d1 of the screw rod, and is smaller than the distance s4 between the center of the pin hole 44 of the tension block 4 and the upper plane 43 of the base plate 41; that is, r1 = 1 / 2d1 <s4。

[0059] In order to enable the tension block 4 and the screw rod 1 connected at 90 degrees to pass smoothly from top to bottom through the inner hole of the bushing C, especially the inner hole of the small-diameter sleeve C2, the size of the tension block 4 must at least meet the following minimum conditions: because the tension block 4 passes through the inner hole of the small-diameter sleeve C2 horizontally, Fig.11 and Fig.12 Therefore, the height h4 of the tension block 4 needs to be at least smaller than the inner diameter of the small-diameter sleeve C2, and the diameter d1 of the screw rod 1 is smaller than the height t4 of the hinged ear plate 42, that is, d1 <t4。

[0060] In order for the tension block 4 to pull the bushing C from below, the length d4 of the tension block 4 needs to be greater than the inner diameter of the small-diameter sleeve C2 and smaller than the outer diameter of the small-diameter sleeve C2.

[0061] Please refer to Figure 3 and Figure 6 The screw nut 3 is connected to the thread 11 of the screw 1 through an internal thread and penetrates into the countersunk hole 23. Fig.14 The outer periphery of the screw nut 5 is provided with an outer hexagonal portion for transmitting torque, which can be rotated with a wrench tool to achieve tightening, and its outer diameter must be greater than the diameter of the center hole 21 of the beam 2.

[0062] The tension block 4 and the screw rod 1 are connected at 90 degrees to each other, and pass through the inner hole of the bushing C and its small-diameter sleeve C2 from top to bottom. Then, the tension block 4 rotates 90 degrees by gravity to be coaxial with the screw rod 1. The screw nut 3 rotates and relies on the crossbeam 2 fixed on the cylinder head A to pull the screw rod 1 upward through the thread 11, so that the upper plane 43 of the tension block 4 is tightly attached to the lower end surface of the small-diameter sleeve C2 with the peripheral part. The screw rod 1 continues to move upward and applies force through the tension block 4 to pull the bushing C upward, overcome the interference friction between the small-diameter sleeve C2 and the small hole B2, and remove the bushing C from the mounting hole B of the cylinder head A.

[0063] See also Fig.16 The specific process of the method for removing the fuel injector for ignition according to the present invention is as follows:

[0064] 1) The screw rod 1 is passed through the central hole 21 of the cross beam 2 from top to bottom with the arc head 12 facing downward, and the screw nut 3 is screwed onto the thread 11 of the screw rod 1 above the cross beam 2;

[0065] 2) The arc head 12 and the flat part 13 of the screw rod 1 are embedded between the two hinged ear plates 42 of the tension block 4, the round pin 5 is inserted into the pin hole 44 and the hinge hole 14, the tension block 4 is hinged to the lower end of the screw rod 1, and the tension block 4 is rotated until its symmetry center line is 90° to the axis of the screw rod 1 (see Figure 6 );

[0066] 3) Fix the crossbeam 2 to the cylinder head A above the opening of the mounting hole B through the bolts 6 and the screw holes F;

[0067] 4) Connect the tension block 4 and the screw rod 1 at 90° to each other (see Figure 6 ), passes through the inner hole of the bushing C and its small diameter sleeve C2 from top to bottom, and then the tension block 4 rotates 90° by gravity to be coaxial with the screw rod 1 (see Figure 3 );

[0068] 5) Rotate the screw nut 3 to be close to the crossbeam 2, and pull the screw 1 and the tension block 4 upward through the thread 11, so that the peripheral portion of the upper plane 43 of the tension block 4 is in close contact with the lower end surface of the small-diameter sleeve C2;

[0069] 6) Continue to rotate the screw nut 3, the screw 1 pulls the bushing C upward through the tension block 4, overcomes the interference friction between the small-diameter sleeve C2 and the small hole B2, and pulls out the bushing C, thereby completing the installation of the sleeve removal tool from the top of the cylinder head A and realizing the disassembly operation of the bushing of the pilot oil injector.

[0070] The present invention does not need to remove the cylinder head from the main engine. The removal tool is directly passed through the bushing. The tension block is turned over under the action of gravity. The pilot oil injector bushing can be removed by utilizing the characteristic that the outer diameter of the tension block is larger than the inner diameter of the bottom of the bushing. This greatly improves the efficiency of the operation, saves the maintenance time of the marine dual-fuel main engine, and meets the requirements of reducing production costs and ensuring product quality.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be within the technical scope of the present invention.

Claims

1. A simple removal tool for a pilot oil injector, wherein the pilot oil injector is installed in a mounting hole of a cylinder head, a small hole is provided at the bottom of the mounting hole, a bushing is installed between the pilot oil injector and the mounting hole, a small diameter sleeve at the bottom of the bushing forms an interference fit with the small hole, and a screw hole for installing the pilot oil injector is provided on the top of the cylinder head; characterized in that: The simple disassembly tool comprises a screw rod, a crossbeam, a screw rod nut, a tension block, a round pin and a bolt; The crossbeam is fixed to the cylinder head above the opening of the mounting hole through the bolts and screw holes, a center hole is provided in the center of the crossbeam, and a countersunk hole is provided concentrically with the center hole; The screw rod is a round rod-type component, with threads on the outer circumference, and a semicircular arc head and a flat portion at the lower end for connecting with the tension block, and the flat portion is provided with a hinge hole. The screw rod passes through the center hole of the beam and the inner hole of the bushing from top to bottom, and the lower end extends out from the bottom of the small-diameter sleeve; The tension block includes a base plate, two hinged ear plates are vertically extended upward from the upper plane of the base plate, an open groove is formed between the two hinged ear plates for accommodating the flat part of the screw rod, and horizontal pin holes are coaxially opened on the two hinged ear plates. The tension block is hinged to the flat part of the lower end of the screw rod through the round pin and can rotate on the screw rod around the round pin. The peripheral part of the upper plane is in close contact with the lower end surface of the small-diameter sleeve. When the tension block rotates to a position where its symmetry center line forms a 90° position with the axis of the screw rod, it can pass through the inner hole of the small-diameter sleeve at the lower part of the bushing together with the screw rod; The screw nut is connected to the screw by threads and penetrates into the countersunk hole.

2. The simple disassembly tool for the pilot oil injector according to claim 1, characterized in that: U-shaped grooves for connecting the bolts are provided on both sides of the crossbeam.

3. The simple disassembly tool for the pilot oil injector according to claim 1, characterized in that: The distance between the two hinged ear plates is greater than the thickness of the flat portion of the screw rod.

4. The simple disassembly tool for a pilot oil injector according to claim 1, characterized in that: The radius of the arc head of the screw rod is equal to 1 / 2 of the diameter of the screw rod and is smaller than the distance between the center of the pin hole of the tension block and the upper plane of the base plate.

5. The simple disassembly tool for the pilot oil injector according to claim 1, characterized in that: The tension block must at least meet the following minimum conditions: the height of the tension block is smaller than the inner diameter of the small-diameter sleeve, and the diameter of the screw rod is smaller than the height of the hinged ear plate.

6. The simple disassembly tool for a pilot oil injector according to claim 1, characterized in that: The length of the tension block is greater than the inner diameter of the small-diameter sleeve and smaller than the outer diameter of the small-diameter sleeve.

7. The simple disassembly tool for a pilot oil injector according to claim 1, characterized in that: The outer diameter of the screw nut is greater than the diameter of the central hole of the crossbeam.

8. The simple disassembly tool for a pilot oil injector according to claim 1, characterized in that: The round pin is clearance-fitted with the hinge hole and interference-fitted with the pin hole.

9. A method for removing a fuel injector using the simple removal tool of claim 1, characterized in that: The tension block and the screw rod are connected at 90 degrees to each other, and pass through the inner hole of the bushing and its small-diameter sleeve from top to bottom. Then, the tension block rotates 90 degrees by gravity to be coaxial with the screw rod. The screw rod nut rotates and relies on the crossbeam fixed on the cylinder head to pull the screw rod upward through the thread, so that the upper plane of the tension block is tightly attached to the lower end surface of the small-diameter sleeve with the peripheral part. The screw rod continues to move upward and applies force through the tension block to pull the bushing upward, thereby overcoming the interference friction between the small-diameter sleeve and the small hole, and removing the bushing from the mounting hole of the cylinder head.

10. The method for removing the pilot oil injector according to claim 9, characterized in that: The disassembly method comprises the following specific steps: 1) The screw rod is passed through the center hole of the cross beam from top to bottom with the arc head facing downward, and the screw rod nut is screwed onto the thread of the screw rod above the cross beam; 2) embed the arc head and the flat part of the screw rod between the two hinged ear plates of the tension block, insert the round pin into the pin hole and the hinge hole, hinge the tension block to the lower end of the screw rod, and rotate the tension block until its symmetry center line forms a 90° position with the axis of the screw rod; 3) fixing the crossbeam to the cylinder head above the opening of the mounting hole through the bolts and screw holes; 4) The tension block and the screw rod connected at 90° to each other are passed through the inner hole of the bushing and its small-diameter sleeve from top to bottom, and then the tension block is rotated 90° by gravity to be coaxial with the screw rod; 5) Rotate the screw nut to be close to the crossbeam, pull the screw and the tension block upward through the thread, so that the peripheral portion of the upper plane of the tension block is close to the lower end surface of the small-diameter sleeve; 6) Continue to rotate the screw nut, the screw pulls the bushing upward through the tension block, overcomes the interference friction between the small-diameter sleeve and the small hole, and pulls out the bushing, thereby completing the installation of the sleeve removal tool from the top of the cylinder head and realizing the disassembly operation of the bushing of the pilot oil injector.

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