Maintenance device for camshaft hole of high-power diesel engine and use method

Abstract

The invention discloses a high-power diesel engine camshaft hole maintenance device and a use method, and belongs to the technical field of engine maintenance. The side wall of the cutter bar is connected with a cutter head, one end of the cutter head is sleeved with a second bush, and the other end of the cutter head is fixedly connected with a screwing head assembly. The bushing II can be inserted into the cam shaft hole; the cutter bar close to the screwing head assembly is sleeved with a shaft sleeve; a flange is arranged at one end of the shaft sleeve; a screw hole is formed in the flange; the cutter bar is in threaded connection with the shaft sleeve; the length of a tool nose cutting line of the tool bit is larger than the thread pitch of the threaded connection. According to the invention, the camshaft hole of the diesel engine can be machined on site without being machined by a machine tool, so that the efficiency of maintaining the camshaft hole of the high-power diesel engine is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine maintenance, and specifically relates to a maintenance device and usage method for the camshaft hole of a high-power diesel engine. Background Art

[0002] The out-of-tolerance of the camshaft hole of a diesel engine mainly includes out-of-tolerance in size, which will affect the mating accuracy with the camshaft and cause uneven contact between the camshaft hole and the camshaft. When the above out-of-tolerance occurs in the camshaft hole, maintenance is required, otherwise it will affect the service life of the diesel engine and even risk the scrapping of the whole machine. The problem is that during general repairs, the diesel engine must be disassembled extensively and the engine block must be returned to the processing factory to complete the machining of the camshaft hole and the fitting of the sleeve using a boring machine or a machining center. After the repair is completed, the engine block is shipped to the customer. The above repair process will waste a lot of time on disassembly, assembly and transportation, increasing the maintenance cost. Especially for high-power marine diesel engines, it is difficult, costly and inefficient to disassemble and assemble the engine block from the hull. In the prior art, there is a lack of devices and methods for repairing the camshaft hole on-site in high-power diesel engines, which in turn affects the service life of the diesel engine. Summary of the Invention

[0003] In order to overcome the deficiencies in the background art, the present invention provides a maintenance device and usage method for the camshaft hole of a high-power diesel engine, aiming to change the maintenance method, simplify the process and improve the service life of the diesel engine. It can realize the machining of the camshaft hole of the diesel engine at the shipyard, without the need to extensively disassemble the engine block and without using machine tools for machining, thereby improving the efficiency of repairing the camshaft hole of high-power diesel engines and reducing the maintenance cost.

[0004] To achieve the above object, the present invention provides the following technical solution: A maintenance device for the camshaft hole of a high-power diesel engine, including a tool shank; a tool bit is connected to the side wall of the tool shank, a second bushing is sleeved at one end thereof, and a screwing head assembly is fixedly connected to the other end thereof for connecting a screwing tool; the second bushing can be inserted into the camshaft hole of the diesel engine; a sleeve is sleeved on the tool shank near the position of the screwing head assembly; one end of the sleeve is provided with a flange, and screw holes are provided on the flange for detachably installing the sleeve to one end of the engine block of the diesel engine through a second screw; the tool shank is threadedly connected with the sleeve; the cutting line length of the tool bit tip is greater than the pitch of the threaded connection.

[0005] As a further optimization, the inner wall of the sleeve is provided with internal threads; a transmission sleeve is sleeved on the tool shank between the screwing head assembly and the sleeve, one end of the transmission sleeve is provided with an extension portion, and external threads corresponding to the internal threads are provided on the outside of the extension portion for threaded connection between the transmission sleeve and the sleeve; the transmission sleeve is fixedly connected to the tool shank through a first screw.

[0006] As a further optimization, the screwing head assembly includes a connecting shaft sleeved on one end of the tool bar; the connecting shaft is fixedly connected to the tool bar through a connecting pin, and a hexagonal head is fixedly arranged at its end for connecting a screwing tool.

[0007] As a further optimization, it further includes a first bushing sleeved on the tool bar; the first bushing can be inserted into the camshaft hole; the tool bit is located between the first bushing and the second bushing.

[0008] As a further optimization, the tool bit is detachably connected to the tool bar by screws.

[0009] As a further optimization, it further includes a positioning sleeve, the positioning sleeve is detachably installed at one end of the body of the diesel engine, and the shaft sleeve is fixedly connected to one end of the positioning sleeve by a second screw.

[0010] As a further optimization, there are multiple screw holes corresponding to the first screw on the tool bar, and they are evenly distributed at axial intervals for adjusting the initial position of the transmission sleeve on the tool bar.

[0011] The present invention also provides a usage method of a maintenance device for a camshaft hole of a high-power diesel engine. Using the maintenance device for a camshaft hole of a high-power diesel engine as described above, it includes the following steps:

[0012] S1: First, according to the aperture size of the camshaft hole to be repaired, calculate and obtain the cutting amount, and adjust and set the size of the tool bit on the tool bar according to the cutting amount;

[0013] S2: Install the shaft sleeve at one end of the diesel engine so that the axis of the shaft sleeve coincides with the axis of the camshaft hole to be repaired;

[0014] S3: After inserting the second bushing into the next gear camshaft hole adjacent to the camshaft hole to be repaired, then insert the tool bar into the shaft sleeve so that the tool bit is close to the camshaft hole to be repaired, and the end of the tool bar is inserted into the second bushing;

[0015] S4: Connect the screwing head assembly to a screwing tool and drive the tool bar to rotate; through the threaded connection between the tool bar and the shaft sleeve, the tool bit is spirally advanced to cut the camshaft hole to be repaired, and continuously rotate the tool bar until the processing of the camshaft hole is completed;

[0016] S5: Rotate the tool bar in the reverse direction so that both the tool bit and the end of the tool bar are disengaged from the camshaft hole to be repaired, then insert a sleeve into the camshaft hole to complete the repair of the camshaft hole.

[0017] As a further optimization, the screwing tool is any one of an electric wrench, a handwheel, and a manual wrench.

[0018] The advantages of the present invention are as follows. First, the cutting motion of the tool is achieved through screw drive in this device, which can ensure the machining accuracy of the camshaft hole; and large machining equipment is not required, making it flexible and convenient. Second, the diesel engine does not need to be completely disassembled as a whole, nor does it need to be sent back to the factory. With this device, the machining of the camshaft hole can be completed on-site, saving maintenance costs and improving maintenance efficiency. Third, the structure of this camshaft hole repair device is simple, the operation is easy, and the cost is low. In short, the present invention can realize the on-site machining of the camshaft hole of the diesel engine without using machine tools, improving the efficiency of repairing the camshaft hole of high-power diesel engines and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic structural diagram of the repair device according to Embodiment 1 of the present invention;

[0020] Figure 2 Schematic structural diagram of the bushing according to Embodiment 1 of the present invention;

[0021] Figure 3 Schematic structural diagram when machining the camshaft hole of a diesel engine according to Embodiment 1 of the present invention;

[0022] Figure 4 Schematic diagram of the principle of spiral cutting of the tool tip according to Embodiment 1 of the present invention;

[0023] Figure 5 Schematic structural diagram when machining the camshaft hole of a diesel engine according to Embodiment 2 of the present invention;

[0024] Figure 6 Schematic structural diagram of the positioning sleeve according to Embodiment 2 of the present invention.

[0025] In the figure: 1, tool shank; 2, first bushing; 3, second bushing; 4, bushing; 5, drive sleeve; 6, connecting shaft; 7, connecting pin; 8, first screw; 9, second screw; 10, third screw; 11, positioning sleeve; 12, diesel engine body; 13, camshaft hole; 14, tool tip; 15, length of the tool tip cutting line. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only some preferred embodiments of the present invention, rather than all embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0027] Embodiment 1; Please refer to Figure 1-4 .

[0028] In this embodiment, the camshaft hole 13 of a certain type of high-power diesel engine installed on the hull is taken as the repair object. Without removing the diesel engine from the hull, only the cylinder head and the accessories at both ends, as well as components such as the camshaft, need to be removed, so that the camshaft hole 13 of the diesel engine block 12 is exposed. The following technical solution is provided in this embodiment: A repair device for the camshaft hole of a high-power diesel engine, including a tool shank 1; a tool bit 14 is connected to the side wall of the tool shank 1. A second bushing 3 is sleeved at one end of it, and a screwing head assembly is fixedly connected to the other end for connecting a screwing tool; the second bushing 3 can be inserted into the camshaft hole 13 of the diesel engine; a sleeve 4 is sleeved on the tool shank 1 near the position of the screwing head assembly; a flange is provided at one end of the sleeve 4, and connection holes are provided on the flange for detachably installing the sleeve 4 to one end of the diesel engine block through a second screw 9; the tool shank 1 is threadedly connected to the sleeve 4; the cutting edge length 15 of the tool bit is greater than the pitch of the threaded connection.

[0029] During use, the following steps S1 - S5 are included.

[0030] S1: First, according to the aperture size of the camshaft hole 13 to be repaired, calculate and obtain the cutting amount, and adjust the size of the tool bit 14 on the tool shank 1 according to the cutting amount.

[0031] S2: Install the sleeve 4 at one end of the diesel engine so that the axis of the sleeve 4 coincides with the axis of the camshaft hole 13 to be repaired.

[0032] S3: After inserting the second bushing 3 into the next gear camshaft hole 13 adjacent to the camshaft hole 13 to be repaired, then insert the tool shank 1 into the sleeve 4 so that the tool bit 14 is close to the camshaft hole 13 to be repaired, and the end of the tool shank 1 is inserted into the second bushing 3.

[0033] S4: The screwing head assembly is connected to a screwing tool to drive the tool shank 1 to rotate; through the threaded connection between the tool shank 1 and the sleeve 4, the tool bit 14 is advanced in a spiral manner to cut the camshaft hole 13 to be repaired. Continuously rotate the tool shank 1 until the machining of the camshaft hole  13 is completed.

[0034] S5: Rotate the tool shank 1 in the reverse direction so that both the tool bit 14 and the end of the tool shank 1 are disengaged from the camshaft hole 13 to be repaired, and then insert a sleeve into the camshaft hole 13 to complete the repair of the camshaft hole 13.

[0035] Among them, the screwing tool is any one of an electric wrench, a handwheel, and a manual wrench.

[0036] The advantages of this embodiment are as follows. First, the cutting motion of the tool is realized through screw drive in this device, which can ensure the machining accuracy of the camshaft hole 13. Moreover, large-scale machining equipment is not required, which is flexible and convenient. Second, the diesel engine does not need to be completely disassembled as a whole, nor does it need to be returned to the factory. With this device, the machining of the camshaft hole 13 can be completed on-site, saving maintenance costs and improving maintenance efficiency. Third, the repair device for the camshaft hole 13 has a simple structure, is easy to operate, and has a low cost.

[0037] In one of the implementation manners, an internal thread is provided on the inner wall of the sleeve 4; an external thread is provided on the tool shank 1 to achieve the threaded connection described above. A hexagonal head is machined at the end of the tool shank 1 to connect a screwing tool. However, in this manner, the external thread and the hexagonal head are integrally formed with the tool shank 1. After the external thread and the hexagonal head are damaged, the entire tool shank 1 needs to be repaired or scrapped, which is not cost-effective.

[0038] This embodiment adopts a more optimal implementation manner. Specifically, an internal thread is provided on the inner wall of the sleeve 4; a transmission sleeve 5 is sleeved on the tool shank 1 between the screwing head assembly and the sleeve 4. One end of the transmission sleeve 5 is provided with an extension part, and an external thread corresponding to the internal thread is provided on the outer side of the extension part for the threaded connection between the transmission sleeve 5 and the sleeve 4; the transmission sleeve 5 is fixedly connected to the tool shank 1 by a first screw 8. The screwing head assembly includes a connecting shaft 6 sleeved on one end of the tool shank 1; the connecting shaft 6 is fixedly connected to the tool shank 1 by a connecting pin 7, and a hexagonal head is fixedly provided at its end for connecting a screwing tool.

[0039] It can be seen that the external thread and the hexagonal head in this embodiment are both detachable and can be replaced after being damaged, without the need to repair the tool shank 1, which is more convenient to use and has a lower cost.

[0040] Although the parts of the tool shank 1 on both sides of the tool head 14 are supported by the sleeve 4 and the bushing, avoiding the cantilever structure and improving the cutting accuracy, in order to further improve the machining accuracy and the supporting ability of the tool shank 1 to make the tool shank 1 more stable when rotating, this embodiment further includes a first bushing 2 sleeved on the tool shank 1; the first bushing 2 can be inserted into the camshaft hole 13; the tool head 14 is located between the first bushing 2 and the second bushing 3. Among them, the first bushing 2 is inserted into the adjacent upper gear camshaft hole 13 to be repaired, making the stiffness of the tool shank 1 better and the machining accuracy higher.

[0041] In order to facilitate the adjustment or replacement of the tool head 14, the tool head 14 is detachably connected to the tool shank 1 by screws. Although the tool head 14 makes a spiral motion, in order to avoid the cutting trajectory of the tool tip being a thread line, the cutting line length 15 of the tool tip is greater than the pitch of the threaded connection, so that all parts of the camshaft hole 13 can be cut.

[0042] Preferably, there are a plurality of screw holes corresponding to the first screw 8 on the tool shank 1, and they are evenly distributed at axial intervals for adjusting the initial position of the transmission sleeve 5 on the tool shank 1 to adapt to different machining positions and facilitate the adjustment of the initial position of the cutting head 14.

[0043] Example 2, please refer to Figure 1 、 2 、5, 6.

[0044] The difference between this embodiment and Embodiment 1 is that the camshaft hole 13 repaired in Embodiment 1 is close to the shock-absorbing end, and the tool shank 1 needs to feed from the shock-absorbing end. Since there are differences in the machining of screw holes on the outer surface of the camshaft holes 13 in the first and last gears. The camshaft hole 13 repaired in this embodiment is close to the other end of the diesel engine, that is, the flywheel end. At this time, the positioning sleeve 11 is installed on the flywheel end of the engine block by the third screw 10, and then the bushing 4 is installed on the positioning sleeve 11.

[0045] Therefore, on the basis of having the same advantages as Embodiment 1, this embodiment can insert the same tool shank 1 and bushing 4 and other components into the inside of the diesel engine block 12 from both ends respectively to machine the camshaft holes 13 at different positions. The tool shank 1 and other components have good versatility, and the length of the tool shank 1 can be as short as possible, with good stiffness, high machining accuracy, and cost savings in manufacturing.

[0046] The parts not detailed in the present invention are the prior art; for those of ordinary skill in the art, the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered to be within the scope described in this specification. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A maintenance device for the camshaft hole of a high-power diesel engine, characterized in that: It includes a tool shank (1); a tool bit (14) is connected to the side wall of the tool shank (1). One end of the tool shank (1) is sleeved with a second bushing (3), and the other end is fixedly connected with a screwing head assembly for connecting a screwing tool; the second bushing (3) can be inserted into the camshaft hole (13) of the diesel engine; A bushing (4) is sleeved on the tool shank (1) near the position of the screwing head assembly; one end of the bushing (4) is provided with a flange, and the flange is provided with screw holes for detachably installing the bushing (4) to one end of the diesel engine body through a second screw (9); the tool shank (1) is threadedly connected with the bushing (4); The cutting line length (15) of the tip of the tool bit is greater than the pitch of the threaded connection.

2. The maintenance device for the camshaft hole of a high-power diesel engine according to claim 1, wherein: The inner wall of the bushing (4) is provided with internal threads; a transmission sleeve (5) is sleeved on the tool shank (1) between the screwing head assembly and the bushing (4). One end of the transmission sleeve (5) is provided with an extension part, and the outer side of the extension part is provided with external threads corresponding to the internal threads for the transmission sleeve (5) to be threadedly connected with the bushing (4); the transmission sleeve (5) is fixedly connected with the tool shank (1) through a first screw (8).

3. A high-power diesel engine camshaft hole repair device according to claim 2, characterized in that: The screwing head assembly includes a connecting shaft (6) sleeved on one end of the tool shank (1); the connecting shaft (6) is fixedly connected with the tool shank (1) through a connecting pin (7), and a hexagonal head is fixedly arranged at its end for connecting a screwing tool.

4. A high-power diesel engine camshaft hole repair device according to claim 2, characterized in that: It also includes a first bushing (2) sleeved on the tool shank (1); the first bushing (2) can be inserted into the camshaft hole (13); the tool bit (14) is located between the first bushing (2) and the second bushing (3).

5. A repair device for a camshaft hole of a high-power diesel engine according to claim 1, characterized in that: The tool bit (14) is detachably connected to the tool shank (1) through screws.

6. The repair device for the camshaft hole of a high-power diesel engine according to claim 1, wherein: It also includes a positioning sleeve (11), the positioning sleeve (11) is detachably installed at one end of the diesel engine body, and the bushing (4) is fixedly connected to one end of the positioning sleeve (11) through a second screw (9).

7. A high-power diesel engine camshaft hole repair device according to claim 2, characterized in that: There are multiple screw holes corresponding to the first screw (8) on the tool shank (1), and they are evenly distributed axially at intervals for adjusting the initial position of the transmission sleeve (5) on the tool shank (1).

8. A method for using a maintenance device for a camshaft hole of a high-power diesel engine, characterized in that, Using the high-power diesel engine camshaft hole repair device according to any one of claims 1-7, it includes the following steps: S1: First, according to the aperture size of the camshaft hole (13) to be repaired, calculate and obtain the cutting amount, and adjust the size of the tool bit (14) on the tool shank (1) according to the cutting amount; S2: Install the bushing (4) at one end of the diesel engine so that the axis of the bushing (4) coincides with the axis of the camshaft hole (13) to be repaired; S3: After inserting the second bushing (3) into the next gear camshaft hole (13) adjacent to the camshaft hole (13) to be repaired, then insert the tool shank (1) into the bushing (4) so that the tool bit (14) is close to the camshaft hole (13) to be repaired, and the end of the tool shank (1) is inserted into the second bushing (3); S4: Connect the screwing head assembly to the screwing tool to drive the tool shank (1) to rotate; due to the threaded connection between the tool shank (1) and the bushing (4), the cutting head (14) is advanced helically to cut the camshaft hole (13) to be repaired, and continuously rotate the tool shank (1) until the machining of the camshaft hole (13) is completed; S5: Reverse-rotate the tool shank (1) so that both the cutting head (14) and the end of the tool shank (1) are disengaged from the camshaft hole (13) to be repaired, and then insert a sleeve into the camshaft hole (13) to complete the repair of the camshaft hole (13).

9. The usage method of a maintenance device for the camshaft hole of a high-power diesel engine according to claim 8, characterized in that: The screwing tool is any one of an electric wrench, a handwheel, and a manual wrench.

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