Replacing tool for main bearing bush

Abstract

The utility model discloses a replacement tool for a main bearing bush, and relates to the technical field of quick assembly and disassembly devices. The main bearing bush is arranged on the outer side of a crankshaft between a main bearing cover and a machine body; a crankshaft oil duct hole is formed in the crankshaft in the radial direction, and an internal threaded hole is formed in a main bearing bolt, connected with a machine body, of a main bearing cover. The lifting mechanism is connected to the base in a sliding mode and can drive the main bearing cover to do lifting motion relative to a machine body so as to take out a main bearing bush on one side of the main bearing cover; the guide piece is fixedly connected to the base and can be partially connected to the interior of the internal threaded hole; the pushing assembly comprises a pushing piece and a connecting plate which are connected with each other; the connecting plate is pushed to enable the pushing piece to be inserted into the crankshaft oil duct hole, and a main bearing bush on one side of the machine body can be ejected out. And the main bearing bush between the main bearing cover of a certain gear and the engine body can be disassembled without disassembling the whole engine.

Description

Technical Field

[0001] The utility model belongs to the technical field of quick assembly and disassembly devices, and in particular relates to a tool for replacing a main bearing bush. Background Art

[0002] The crankshaft is installed in the mounting hole formed by the connection between the engine body and the main bearing cover. A main bearing is arranged between the crankshaft and the mounting hole. The main bearing supports the crankshaft and is subjected to complex alternating loads caused by gas explosion pressure, piston connecting rod group inertia force, etc. during operation, which affects the working life and reliability of the diesel engine. A main bearing is arranged between the main bearing and the crankshaft. The main bearing is used to prevent the friction between the crankshaft and the mounting hole from damaging the crankshaft. Due to the increasing degree of wear of the main bearing under the long-term operation of the crankshaft, it may even exceed the allowable value, so that when the tension is small, the surface of the main bearing is hardened, which may easily cause the risk of cracks and peeling of the main bearing in severe cases. Therefore, the main bearing needs to be replaced regularly.

[0003] The existing replacement of main bearings usually requires the removal of the entire engine, including the complete removal of multiple main bearing caps arranged in a row in the entire engine. During bench testing or use on a ship, once the main bearing in a certain gear of the main bearing cap is abnormal and needs to be inspected or replaced, the engine can only be removed from the bench or removed from the ship. The construction and operation process is complicated, and the cost, manpower and material resources consumed are huge. The application number of the existing patent is CN202211244711.4, and the patent name is a hydraulic main bearing cap removal tool and its use method. It discloses that the main bearing cap is replaced by driving the piston rod up and down by a hydraulic pump to drive the main bearing cap to generate displacement, but its hydraulic cylinder occupies a large space, and the space inside the engine is limited, which is not conducive to deployment and operation; and it is also necessary to connect additional equipment such as hydraulic pipelines and hydraulic pumps, which further increases the occupied space and is inconvenient to operate, and it can only realize the removal of the main bearing cap located in the main bearing cap, and cannot realize the removal of the main bearing cap on the body. Utility Model Content

[0004] The utility model provides a tool for replacing a main bearing to solve the problem that in the prior art, the whole machine usually needs to be disassembled before the main bearing can be replaced, and the method of using a hydraulic cylinder to drive a piston rod occupies a large space, which is not conducive to loading and unloading operations, and the replacement method in the prior art can only realize the replacement of the main bearing located in the main bearing cover.

[0005] The technical solution adopted by the utility model is:

[0006] A main bearing replacement tool is used for disassembling and installing the main bearing on the outer side of the crankshaft between the main bearing cap and the engine body; the crankshaft is provided with a crankshaft oil passage hole in the radial direction, and the main bearing bolt connecting the main bearing cap and the engine body is provided with an internal threaded hole, and the main bearing replacement tool comprises:

[0007] Base;

[0008] A lifting mechanism, the lifting mechanism is slidably connected to the base and can drive the main bearing cap to perform lifting movement relative to the machine body to remove the main bearing shell on one side of the main bearing cap;

[0009] A guide member, the guide member is fixedly connected to the base and can be partially connected to the internal threaded hole;

[0010] The ejector assembly comprises an ejector member and a connecting plate connected to each other; the connecting plate is pushed to insert the ejector member into the crankshaft oil passage hole, so as to eject the main bearing bush on one side of the machine body.

[0011] The main bearing replacement tool of the utility model also has the following additional technical features:

[0012] The lifting mechanism includes a first connecting seat, a second connecting seat and a lifting assembly; a lifting assembly capable of lifting and lowering movement is connected between the first connecting seat and the second connecting seat, the first connecting seat is slidably connected to the base, and the second connecting seat can be abutted and connected to the main bearing cover under the action of the lifting assembly to drive the main bearing cover to move relative to the machine body.

[0013] The base has a slot hole arranged along the length direction of the base and mounting holes arranged at both ends of the extending direction of the slot hole; the first connecting seat is slidably connected to the slot hole, and the guide member is fixedly connected to the mounting hole.

[0014] The lifting assembly includes a first lifting assembly, a second lifting assembly and a driving rod; the first lifting assembly and the second lifting assembly are symmetrically connected between the first connecting seat and the second connecting seat; the driving rod is connected between the first lifting assembly and the second lifting assembly and can drive the first lifting assembly and the second lifting assembly to perform lifting movements.

[0015] The first lifting assembly includes a first lifting arm assembly and a first connecting member hingedly connected to the first lifting arm assembly; the second lifting assembly includes a second lifting arm assembly and a second connecting member hingedly connected to the second lifting arm assembly; the first lifting arm assembly and the second lifting arm assembly are enabled to perform lifting movements by changing the spacing between the first connecting member and the second connecting member.

[0016] The driving rod has a driving end connected to the first connecting member and a fastening end connected to the second connecting member; the driving end is slidably connected to the first connecting member, and the fastening end is fastened to the second connecting member, and the driving end is driven to move axially relative to the first connecting member to change the distance between the first connecting member and the second connecting member.

[0017] The driving end is connected with an adjustment rod perpendicular to the axial direction of the driving rod, and is used for being handheld to rotate the driving rod.

[0018] The side of the connecting plate facing the ejector member has an arc surface matched with the outer circumferential surface of the crankshaft.

[0019] The guide member has a guide portion for guiding the main bearing cap, one end of the guide portion along the axial direction has a fixed end connected to the base, and the other end of the guide member along the axis line has a connecting end extending and connected to the internal threaded hole.

[0020] At least a partial area of ​​the guide portion is provided with a mesh pattern to prevent the guide member from falling off in the axial direction when the guide member is held by hand.

[0021] Due to the adoption of the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0022] 1. A main bearing replacement tool, used for disassembling and installing the main bearing on the outer side of the crankshaft between the main bearing cap and the engine body; the crankshaft is provided with a crankshaft oil passage hole in the radial direction, and the main bearing bolt connecting the main bearing cap and the engine body is provided with an internal threaded hole, and the main bearing replacement tool comprises: a base; a lifting mechanism, the lifting mechanism is slidably connected to the base and can drive the main bearing cap to perform lifting movement relative to the engine body so as to remove the main bearing on one side of the main bearing cap; a guide member, the guide member is fixedly connected to the base and can be partially connected to the internal threaded hole; an ejector assembly, comprising a connected ejector member and a connecting plate; pushing the connecting plate to insert the ejector member into the crankshaft oil passage hole can eject the main bearing on one side of the engine body. The guide piece can connect the entire main bearing replacement tool to the internal threaded hole, so that the main bearing replacement tool can be directly connected to the engine body, saving space. The guide piece has a guiding effect on the main bearing cover. After the lifting mechanism abuts against the bottom of the main bearing cover, it can drive the main bearing cover to drop a certain distance along the guide piece, so that space for disassembling and installing the main bearing cover is reserved between the main bearing cover and the engine body. The main bearing cover on one side of the main bearing cover can be directly taken out through this space, and the main bearing cover on one side of the engine body needs to be inserted to the bottom of the main bearing cover with the help of the ejector assembly. The crankshaft oil passage hole distributed in the radial direction of the crankshaft is rotated so that the main bearing pushed out by the ejection assembly falls down under the action of gravity to achieve disassembly. The present application avoids the problem of removing the engine from a stand or from a cabin, saves a lot of manpower and material resources, reduces labor intensity and cost; it is possible to disassemble a certain gear main bearing cover without disassembling the entire engine, thereby achieving separate disassembly and assembly of the main bearing cover of a certain gear, and also achieving disassembly and assembly of the main bearing cover on one side of the engine body; the main bearing cover can be quickly assembled and disassembled by replacing tools without damaging the main bearing cover.

[0023] 2. As a preferred embodiment of the utility model, the lifting mechanism includes a first connecting seat, a second connecting seat and a lifting assembly; a lifting assembly capable of lifting and lowering movement is connected between the first connecting seat and the second connecting seat, the first connecting seat is slidably connected to the base, and the second connecting seat can abut against the main bearing cap under the action of the lifting assembly to drive the main bearing cap to move relative to the machine body. The first connecting seat can slide relative to the base, and the position adjustment of the lifting mechanism along the base can be realized, so as to adjust the position of the lifting mechanism relative to the main bearing cap, so as to facilitate the disassembly of the main bearing cap of a certain gear under the corresponding machine body; the second connecting seat can abut against the bottom of the main bearing cap under the rising action of the lifting assembly, and after the main bearing cap is in contact with the main bearing cap, the main bearing cap is linked with the lifting assembly under the descending action of the lifting assembly, so that the main bearing cap is lowered a certain distance relative to the machine body, and a space for disassembling and assembling the main bearing shell is reserved.

[0024] 3. As a preferred embodiment of the present invention, the base has a slot hole arranged along the length direction of the base and connection holes arranged at both ends of the extending direction of the slot hole; the first connection seat is slidably connected to the slot hole, and the guide member is fixedly connected to the connection hole. The slot hole is arranged along the length direction, and the connection holes are symmetrically arranged on both sides of the extending direction of the slot hole. The first connection seat is slidably connected to the slot hole, and the guide member is fixedly connected to the connection hole, so that the lifting mechanism is arranged between the guide members, and the guide members on both sides are convenient for connecting with the internal threaded holes. The lifting mechanism located in the middle between the guide members on both sides can drive the main bearing cap to realize the lifting of the main bearing cap between the guide members on both sides, so as to support the middle position of the main bearing cap, so that the lifting process of the main bearing cap is smoother, and the lifting mechanism is located between the guide members and can slide along the extending direction of the slot hole of the base, so as to more conveniently adjust the position of the lifting mechanism relative to the main bearing cap.

[0025] 4. As a preferred embodiment of the present invention, the lifting assembly includes a first lifting assembly, a second lifting assembly and a driving rod; the first lifting assembly and the second lifting assembly are symmetrically connected between the first connecting seat and the second connecting seat; the driving rod is connected between the first lifting assembly and the second lifting assembly and can drive the first lifting assembly and the second lifting assembly to perform lifting motion. The driving rod can be installed between the first lifting assembly and the second lifting assembly that are relatively arranged, and by driving the driving rod to displace along the axial direction of the driving rod, the spacing between the first lifting assembly and the second lifting assembly is driven to change, thereby realizing the change in the height of the first lifting assembly and the second lifting assembly, and the second connecting seat above the first lifting assembly and the second lifting assembly can be lifted and lowered, thereby realizing the lifting motion of the main bearing cap.

[0026] 5. As a preferred embodiment of the present invention, the driving rod has a driving end connected to the first connecting member and a fastening end connected to the second connecting member; the driving end is slidably connected to the first connecting member; and the fastening end is fastened to the second connecting member. One end of the driving rod is fixedly connected to the second connecting member, and the other end is slidably connected to the first connecting member. When the driving rod is rotated to cause the driving rod to be displaced relative to the first connecting member, the fixed end of the driving rod and the driving end of the driving rod are linked to achieve displacement relative to the first connecting member, thereby causing the spacing between the first connecting member and the second connecting member to change, thereby achieving a change in the height of the first lifting component connected to the first connecting member, and a change in the height of the second lifting component connected to the second connecting member, thereby driving the lifting mechanism to move up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0028] Figure 1 A side structural diagram of a main bearing bush replacement tool according to an embodiment of the utility model;

[0029] In the figure,

[0030] 1 base;

[0031] 2 lifting mechanism, 21 first connecting seat, 22 first lifting assembly, 221 first lifting arm assembly, 2211 first lifting arm, 2212 second lifting arm, 222 first connecting piece, 23 second lifting assembly, 231 third lifting arm assembly, 2311 third lifting arm, 2312 fourth lifting arm, 232 second connecting piece, 24 second connecting seat, 25 driving rod;

[0032] 3. Guides;

[0033] 4 ejection assembly, 41 ejection member, 42 connection plate;

[0034] 5 slotted hole, 6 mounting hole, 7 connecting end, 8 fixing end, 9 mesh pattern, 10 adjustment rod. DETAILED DESCRIPTION

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0036] In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0039] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0040] The utility model relates to a tool for replacing a main bearing bush, such as Figure 1 As shown, a main bearing replacement tool is used for disassembling and installing the main bearing on the outer side of the crankshaft between the main bearing cover and the body; the crankshaft is provided with a crankshaft oil passage hole in the radial direction, and the main bearing bolt connecting the main bearing cover and the body is provided with an internal threaded hole, and the main bearing replacement tool comprises: a base 1; a lifting mechanism 2, the lifting mechanism 2 is slidably connected to the base 1, and can drive the main bearing cover to perform lifting movement relative to the body to remove the main bearing on one side of the main bearing cover; a guide member 3, the guide member 3 is fixedly connected to the base 1 and can be partially connected to the internal threaded hole; an ejector assembly 4, including an ejector member 41 and a connecting plate 42 connected to each other; pushing the connecting plate 42 to insert the ejector member 41 into the crankshaft oil passage hole can eject the main bearing on one side of the body.

[0041] It is worth noting that the engine body is connected to the top of multiple main bearing caps, and the engine body and each main bearing cap are connected by main bearing bolts. The main bearing bolts are connected from the top of the engine body to the bottom of the main bearing cap, and the ends of the main bearing bolts are fastened to the main bearing caps through the main bearing nuts. A crankshaft is connected to the mounting hole 6 formed between the engine body and the multiple main bearing caps, and a main bearing is connected between the crankshaft and the mounting hole 6. A main bearing bushing is connected between the main bearing and the crankshaft, and the main bearing bushing includes an upper bushing and a lower bushing; the upper bushing is located between the main bearing and the crankshaft on one side of the engine body, and the lower bushing is located between the main bearing and the crankshaft on one side of the main bearing cap.

[0042] The present application does not need to completely disassemble multiple main bearing caps from the engine body, but only needs to disassemble one of the main bearing caps, so that the main bearing shells of a certain level can be disassembled and installed separately. When using the main bearing shell replacement tool of the present application, it is first necessary to remove the observation window cover on the side of the engine body so that the main bearing bolts and main bearing caps and other parts can be exposed; then the main bearing nut in a certain level of main bearing cap can be loosened using a hydraulic tensioner, and then the hydraulic tensioner can be removed; then the guide member 3 is connected to the internal threaded hole opened by the main bearing bolt, and the main bearing nut moves along the guide member 3 to the base 1, and the lifting mechanism 2 is driven to rise and move until it abuts against the bottom surface of the main bearing cap, and then the lifting mechanism 2 is driven to descend so that the main bearing cap and the lifting mechanism 2 move downward together for a certain distance, so that an operating space for removing the main bearing shell is reserved between the main bearing cap and the engine body. For the lower main shaft shell, since the main bearing cap is lowered away from the engine body by a certain distance, the lower main shaft shell can be directly removed in the operating space; for the upper main shaft shell, since the upper main shaft shell is located between the crankshaft and the mounting hole 6 and is located on the crankshaft;

[0043] Since the replacement tool only removes one of the main bearing caps, the remaining main bearing caps are still connected to the bottom of the engine body, so the crankshaft is still located above the main bearing cap that has been removed, so the main shaft upper bearing is not easy to remove. Therefore, the present application also provides a separately configured ejector assembly 4. After the main shaft lower bearing is removed, the ejector assembly 4 is inserted into the crankshaft oil channel hole of the crankshaft, and then the crankshaft is rotated a certain angle. At this time, the ejector assembly 4 can rotate with the crankshaft. When the main shaft upper bearing rotates to the bottom of the crankshaft in the radial direction, the main shaft upper bearing located on the outer circumferential surface of the crankshaft is ejected and falls to the outside of the crankshaft in the radial direction under the action of gravity, thereby completing the removal of the entire main shaft bearing.

[0044] During replacement, the lower bearing of the main shaft is directly placed in the main bearing cover, and the upper bearing of the main shaft is clamped on the outer circumferential surface of the crankshaft through the push-up assembly 4. Then, the main bearing cover is lifted to the bottom of the engine body by the lifting mechanism 2 to contact the engine body, and the guide member 3 is disengaged from the internal threaded hole of the main bearing bolt. The main bearing nut is screwed to assemble the main bearing cover and the engine body, and the installation of the entire main bearing is completed. This application avoids the problem of removing the engine from the stand or from the cabin, saves a lot of manpower and material resources, and reduces labor intensity and cost; it is possible to disassemble a certain gear of the main bearing cover without disassembling the entire engine, thereby realizing the separate disassembly and assembly of the main bearing cover of a certain gear, and can also realize the disassembly and assembly of the main bearing cover on one side of the engine body; the main bearing can be quickly assembled and disassembled by replacing the tool without damaging the main bearing.

[0045] As a preferred embodiment, the lifting mechanism 2 includes a first connecting seat 21, a second connecting seat 24 and a lifting assembly; a lifting assembly capable of lifting and lowering movement is connected between the first connecting seat 21 and the second connecting seat 24, the first connecting seat 21 is slidably connected to the base 1, and the second connecting seat 24 can abut against the main bearing cover under the action of the lifting assembly to drive the main bearing cover to move relative to the machine body.

[0046] The first connecting seat 21 can slide relative to the base 1, and the position adjustment of the lifting mechanism 2 along the base 1 can be realized, so as to adjust the position of the lifting mechanism 2 relative to the main bearing cap, so as to facilitate the disassembly of a main bearing cap of a certain level under the corresponding machine body; the second connecting seat 24 can abut against the bottom of the main bearing cap under the rising action of the lifting assembly, and after being contacted and connected with the main bearing cap, the main bearing cap is linked with the lifting assembly under the descending action of the lifting assembly, so that the main bearing cap is lowered a certain distance relative to the machine body, and space is reserved for disassembling and assembling the main bearing shell.

[0047] There is no specific limitation on the structure of the first connecting socket 21, and any one of the following embodiments may be adopted:

[0048] Implementation method 1: Figure 1 As shown, the middle part of the first connecting seat 21 is connected with a connecting bolt which passes through the first connecting seat 21 in the vertical direction, and the bottom of the connecting bolt is slidably connected in the slot hole 5 and can move along the extension direction of the slot hole 5, so as to realize the first connecting seat 21 sliding along the slot hole 5 to adjust the position of the lifting mechanism 2 relative to the main bearing cover.

[0049] Embodiment 2: The first connecting seat 21 is in the form of a slider structure. The slider has a protrusion at the bottom facing the slot hole 5 . The protrusion is matched with the structure of the slot hole 5 so that the protrusion slides along the slot hole 5 .

[0050] As a preferred embodiment, the base 1 has a slot hole 5 arranged along the length direction of the base 1 and mounting holes 6 arranged at both ends of the extension direction of the slot hole 5; the first connecting seat 21 is slidably connected to the slot hole 5, and the guide member 3 is fixedly connected to the mounting hole 6.

[0051] The slot hole 5 is arranged along the length direction, and connecting holes are symmetrically arranged on both sides of the extension direction of the slot hole 5. The first connecting seat 21 is slidably connected to the slot hole 5, and the guide member 3 is fixedly connected to the mounting hole 6, so that the lifting mechanism 2 is arranged between the guide members 3. The guide members 3 on both sides are convenient for connecting with the internal threaded holes. The lifting mechanism 2 located in the middle between the guide members 3 on both sides can drive the main bearing cover to realize the lifting and lowering of the main bearing cover between the guide members 3 on both sides, so as to support the middle position of the main bearing cover, so that the lifting process of the main bearing cover is smoother, and the lifting mechanism 2 is located between the guide members 3 and can slide along the extension direction of the slot hole 5 of the base 1, so that the position of the lifting mechanism 2 relative to the main bearing cover can be adjusted more conveniently.

[0052] As a preferred embodiment, the lifting assembly includes a first lifting assembly 22, a second lifting assembly 23 and a driving rod 25; the first lifting assembly 22 and the second lifting assembly 23 are symmetrically connected between the first connecting seat 21 and the second connecting seat 24; the driving rod 25 is connected between the first lifting assembly 22 and the second lifting assembly 23 and can drive the first lifting assembly 22 and the second lifting assembly 23 to perform lifting movements.

[0053] The driving rod 25 can be installed between the first lifting assembly 22 and the second lifting assembly 23 which are arranged opposite to each other. By driving the driving rod 25 to displace along the axial direction of the driving rod 25, the distance between the first lifting assembly 22 and the second lifting assembly 23 is changed, thereby realizing the change in the height of the first lifting assembly 22 and the second lifting assembly 23. The second connecting seat 24 above the first lifting assembly 22 and the second lifting assembly 23 can be lifted and lowered, thereby realizing the lifting and lowering movement of the main bearing cover.

[0054] As a preferred embodiment, the first lifting assembly 22 includes a first lifting arm assembly 221 and a first connecting member 222 hingedly connected to the first lifting arm assembly 221; the second lifting assembly 23 includes a first lifting arm assembly 231 and a second connecting member 232 hingedly connected to the first lifting arm assembly 231; the first lifting arm assembly 221 and the first lifting arm assembly 231 are lifted and lowered by changing the distance between the first connecting member 222 and the second connecting member 232.

[0055] Specifically, the first lifting arm assembly 221 includes a first lifting arm 2211 and a second lifting arm 2212; one end of the first lifting arm 2211 is connected to the first connecting seat 21, the other end of the first lifting arm 2211 is connected to the first connecting piece 222, the second lifting arm 2212 is connected to the first connecting piece 222, and the second lifting arm 2212 is connected to the second connecting seat 24; the second lifting arm assembly includes a third lifting arm 2311 and a fourth lifting arm 2312; one end of the third lifting arm 2311 is connected to the first connecting seat 21, the other end of the third lifting arm 2311 is connected to the second connecting piece 232, the fourth lifting arm 2312 is connected to the second connecting piece 232, and the fourth lifting arm 2312 is connected to the second connecting seat 24.

[0056] The driving rod 25 can be installed between the first lifting assembly 22 and the second lifting assembly 23 which are arranged opposite to each other. By driving the driving rod 25 to displace along the axial direction of the driving rod 25, the distance between the first lifting assembly 22 and the second lifting assembly 23 is changed, thereby realizing the change in the height of the first lifting assembly 22 and the second lifting assembly 23. The second connecting seat 24 above the first lifting assembly 22 and the second lifting assembly 23 can be lifted and lowered, thereby realizing the lifting and lowering movement of the main bearing cover.

[0057] like Figure 1As shown, the first lifting assembly 22 and the second lifting assembly 23 are symmetrically distributed along the width direction of the slot hole 5, and the extension direction of the first lifting assembly 22 and the second lifting assembly 23 is perpendicular to the connection direction between the guide members 3 on both sides, so that the first lifting assembly 22 and the second lifting assembly 23 can move along the extension direction of the slot hole 5 without interfering with the guide members 3. The first lifting assembly 22 includes a first lifting arm 2211 and a second lifting arm 2212 which are hingedly connected to both sides of the first connecting member 222, so that a two-link mechanism is formed between the first lifting arm 2211 and the second lifting arm 2212 and the first connecting member 222, and the second lifting assembly 23 includes a third lifting arm 2311 and a fourth lifting arm 2312 which are hingedly connected to both sides of the second connecting member 232, so that a two-link mechanism is formed between the third lifting arm 2311 and the fourth lifting arm 2312 and the second connecting member 232; the driving rod 25 is passed through the first connecting member 222 and the second connecting member 232, one end of the driving rod 25 is fixedly connected to the second connecting member 232, and the other end of the driving rod 25 is slidably connected to the first connecting rod; when in use, when the driving rod 25 is rotated so that the driving rod 25 and the first connecting member 222 slide relative to each other, the first connecting member The distance between the first connecting member 222 and the second connecting member 232 changes. Since the first lifting arm 2211 and the second lifting arm 2212 are hingedly connected to the two sides of the first connecting member 222, and the third lifting arm 2311 and the fourth lifting arm 2312 are hingedly connected to the two sides of the second connecting member 232, when the distance between the first connecting member 222 and the second connecting member 232 is shortened, the first lifting arm 2211 is lifted upward relative to the second lifting arm 2212, and the third lifting arm 2311 is lifted upward relative to the fourth lifting arm 2312, so that the lifting mechanism 2 realizes an upward movement. On the contrary, when the distance between the first connecting member 222 and the second connecting member 232 is increased, the first lifting arm 2211 moves downward relative to the second lifting arm 2212, and the third lifting arm 2311 moves downward relative to the fourth lifting arm 2312, so that the lifting mechanism 2 realizes a downward movement.

[0058] As a preferred embodiment, the driving rod 25 has a driving end connected to the first connecting member 222 and a fastening end connected to the second connecting member 232; the driving end is slidably connected to the first connecting member 222; the fastening end is fastened to the second connecting member 232, and the driving end is driven to move axially relative to the first connecting member 222 to change the distance between the first connecting member 222 and the second connecting member 232.

[0059] One end of the driving rod 25 is fixedly connected to the second connecting member 232, and the other end is slidably connected to the first connecting member 222. When the driving rod 25 is rotated to cause the driving rod 25 to be displaced relative to the first connecting member 222, the fixed end 8 of the driving rod 25 is linked with the driving end of the driving rod 25 to achieve displacement relative to the first connecting member 222, thereby changing the distance between the first connecting member 222 and the second connecting member 232, thereby achieving a change in the height of the first lifting component 22 connected to the first connecting member 222, and a change in the height of the second lifting component 23 connected to the second connecting member 232, thereby driving the lifting mechanism 2 to move up and down.

[0060] The structures of the driving end and the fastening end are not limited by the present application and may adopt any of the following embodiments:

[0061] Embodiment 1: The first connecting member 222 has a first connecting hole for connecting the connecting end 7, the first connecting hole has an internal thread, the driving end is provided with an external thread, and the driving end is threadedly connected to the first connecting hole through the connection between the internal thread and the external thread;

[0062] The second connecting member 232 has a second connecting hole connected to the fastening end, the second connecting hole is a light hole, the fastening end is inserted into the light hole, and the side of the fastening end facing the driving end is connected to the second connecting member 232 through a fastening nut.

[0063] When using, Figure 1 As shown, the driving rod 25 is rotated in the first connecting hole by rotating the driving rod 25. Since the first connecting hole is threadedly connected to the driving rod 25, displacement can occur between the driving rod 25 and the first connecting member 222 along the axial direction of the driving rod 25. When the lifting mechanism 2 needs to be lifted upward, the driving rod 25 is moved along the axial direction toward the side away from the first connecting member 222, so that the first connecting member 222 moves toward the second connecting member 232. Since the fastening end of the driving rod 25 is fixedly connected in the second connecting hole, the fastening end of the driving rod 25 is fixed to the second connecting member 232, and the second connecting member 232 is linked with the driving rod 25, so that the distance between the first connecting member 222 and the second connecting member 232 is reduced; similarly, when the lifting mechanism 2 needs to be lowered, the driving rod 25 is moved along the axial direction toward one side of the first connecting member 222, so that the distance between the first connecting member 222 and the second connecting member 232 is increased.

[0064] Embodiment 2: A clamping plate is hingedly connected to the first connecting member 222, and the clamping plate is inclined to the side of the first connecting member 222 away from the first lifting arm 2211 or the second lifting arm 2212. A clamping portion that is clamped to the clamping plate is provided on the driving rod 25, and the clamping portion has a plurality of grooves along the axial direction of the driving rod 25 that are adapted to the clamping plate. When it is necessary to adjust the distance between the first connecting member 222 and the second connecting member 232, the clamping plate clamped in the groove is lifted so that the driving rod 25 is moved to the desired position along the axial direction, and then the clamping plate is clamped in the corresponding groove so that the distance between the first connecting member 222 and the second connecting member 232 is fixed. Specifically, when it is necessary to realize the downward movement of the lifting mechanism 2, it is necessary to increase the distance between the first connecting member 222 and the second connecting member 232, lift the card plate engaged in the groove, and move the drive rod 25 along the axial direction toward the second connecting member 232; when it is necessary to realize the upward movement of the lifting mechanism 2, it is necessary to shorten the distance between the first connecting member 222 and the second connecting member 232, lift the card plate engaged in the groove, and move the drive rod 25 along the axial direction away from the second connecting member 232.

[0065] Embodiment three: A fastener is rotatably connected to the first connecting member 222, and the fastener can be threadedly connected to the first connecting member 222. The fastener is vertically distributed along the first connecting member 222 and can penetrate the top surface of the first connecting member 222 to the outer circumferential surface of the driving rod 25 in the first connecting member 222 to abut against the driving rod 25, thereby realizing the positioning of the driving rod 25.

[0066] After the guide member 3 of the main bearing replacement tool is connected to the internal threaded hole, when it is necessary to adjust the lifting mechanism 2 to rise and abut against the main bearing cover, first loosen the fastener abutting against the outer side of the driving rod 25, and drive the driving rod 25 to move away from the first connecting member 222 along the axial direction. The movement reduces the distance between the first connecting member 222 and the second connecting member 232, so that the lifting mechanism 2 can realize the lifting movement until it abuts against the bottom surface of the main bearing cover, and then move the driving rod 25 toward the first connecting member 222 along the axial direction, so that the distance between the first connecting member 222 and the second connecting member 232 increases, thereby realizing the descending movement of the lifting mechanism 2 to drive the main bearing cover to descend. When it descends to the required height, tighten the fastener from the first connecting member 222 so that the fastener abuts against the outer circumferential surface of the driving rod 25, thereby fixing the driving rod 25 and fixing the main bearing cover at the required height position.

[0067] As a preferred embodiment, the driving end is connected with an adjustment rod 10 perpendicular to the axial direction of the driving rod 25 for being handheld to rotate the driving rod 25 .

[0068] The adjustment rod 10 is used as a handle to facilitate the staff to hold the adjustment rod 10 and rotate the driving rod 25, so that the driving rod 25 rotates relative to the first connecting member 222 to generate axial displacement, so that the distance between the first connecting member 222 and the second connecting member 232 changes.

[0069] As a preferred embodiment, the side of the connecting plate 42 facing the ejector 41 has an arc surface matched with the outer circumferential surface of the crankshaft.

[0070] like Figure 1 As shown, the connecting plate 42 is an arc-shaped structure, and the shape of the arc surface of the connecting plate 42 facing the ejector 41 is adapted to the shape of the outer circumferential surface of the crankshaft, so that when the ejector 41 of the ejector assembly 4 is inserted into the crankshaft oil passage hole, the connecting plate 42 can fit with the outer circumferential surface of the crankshaft, so that the ejector 41 can be fully inserted into the crankshaft oil passage hole to eject the main shaft upper bearing connected to the outer side of the crankshaft.

[0071] As a preferred embodiment, the guide member 3 has a guide portion for guiding the main bearing cover, one end of the guide portion along the axial direction has a fixed end 8 connected to the base 1, and the other end of the guide member 3 along the axis has a connecting end 7 extending and connected to the internal threaded hole.

[0072] The fixed end 8 of the guide member 3 is inserted into the mounting hole 6. The fixed end 8 has an external thread and can be threadedly connected with the internal thread of the mounting hole 6. The fixed end 8 of the guide member 3 is fixedly connected to the base 1 through a nut; the connecting end 7 of the guide member 3 can be threadedly connected to the internal thread hole. When in use, the connecting end 7 of the guide member 3 is first threadedly connected to the internal thread hole, and then the base 1 is connected to the fixed end 8 of the guide member 3, and the fixed end 8 of the guide member 3 is fixedly connected to the base 1 through a nut; then the lifting mechanism 2 is connected to the base 1.

[0073] As a preferred embodiment, at least a partial area of ​​the guide portion is provided with a mesh 9 to prevent the guide member 3 from falling off in the axial direction when the guide member 3 is held by hand.

[0074] The mesh pattern 9 is made on the guide part of the guide member 3 by a knurling process. The guide part is located between the fixed end 8 and the connecting end 7. The mesh pattern 9 is provided to facilitate the staff to hold the guide part and install the guide member 3 in the internal threaded hole, thereby increasing the friction between the hand and the guide member 3, so that the guide member 3 will not fall off from the hands of the staff.

[0075] As a preferred embodiment, a spirit level is magnetically connected to the base 1 to display the levelness of the base plate after assembly, so that workers can easily observe during on-site assembly and ensure that the installation height of the guide member 3 is consistent, so that the base 1 always remains horizontal and avoids tilting during the installation and removal of the main bearing.

[0076] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.

[0077] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0078] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A main bearing replacement tool, used for disassembling and installing the main bearing on the outer side of the crankshaft between the main bearing cap and the engine body; the crankshaft is provided with a crankshaft oil passage hole in the radial direction, and the main bearing bolt connecting the main bearing cap and the engine body is provided with an internal threaded hole, characterized in that: The replacement tool of the main bearing shell comprises: Base (1); A lifting mechanism (2), the lifting mechanism (2) being slidably connected to the base (1) and capable of driving the main bearing cap to perform lifting movement relative to the machine body so as to remove the main bearing shell on one side of the main bearing cap; A guide member (3), the guide member (3) being fixedly connected to the base (1) and capable of being partially connected to the internal threaded hole; The ejector assembly (4) comprises an ejector member (41) and a connecting plate (42) connected to each other; the connecting plate (42) is pushed to insert the ejector member (41) into the crankshaft oil passage hole, thereby ejecting the main bearing shell on one side of the machine body.

2. A main bearing replacement tool according to claim 1, characterized in that: The lifting mechanism (2) comprises a first connecting seat (21), a second connecting seat (24) and a lifting assembly; A lifting assembly capable of lifting and lowering movement is connected between the first connecting seat (21) and the second connecting seat (24); the first connecting seat (21) is slidably connected to the base (1); and the second connecting seat (24) can be abutted against the main bearing cover under the action of the lifting assembly to drive the main bearing cover to move relative to the machine body.

3. A main bearing replacement tool according to claim 2, characterized in that: The base (1) has a slot hole (5) arranged along the length direction of the base (1) and mounting holes (6) arranged at both ends of the slot hole (5) in the extension direction; the first connecting seat (21) is slidably connected in the slot hole (5), and the guide member (3) is fixedly connected in the mounting hole (6).

4. A main bearing replacement tool according to claim 2, characterized in that: The lifting assembly comprises a first lifting assembly (22), a second lifting assembly (23) and a driving rod (25); The first lifting assembly (22) and the second lifting assembly (23) are symmetrically connected between the first connecting seat (21) and the second connecting seat (24); the driving rod (25) is connected between the first lifting assembly (22) and the second lifting assembly (23) and can drive the first lifting assembly (22) and the second lifting assembly (23) to perform lifting movements.

5. A main bearing replacement tool according to claim 4, characterized in that: The first lifting assembly (22) comprises a first lifting arm assembly and a first connecting member (222) hingedly connected to the first lifting arm assembly; the second lifting assembly (23) comprises a second lifting arm assembly and a second connecting member (232) hingedly connected to the second lifting arm assembly; the first lifting arm assembly and the second lifting arm assembly are enabled to perform lifting motion by changing the distance between the first connecting member (222) and the second connecting member (232).

6. A main bearing replacement tool according to claim 5, characterized in that: The driving rod (25) comprises a driving end connected to the first connecting member (222) and a fastening end connected to the second connecting member (232); the driving end is slidably connected to the first connecting member (222), and the fastening end is fasteningly connected to the second connecting member (232), and the distance between the first connecting member (222) and the second connecting member (232) is changed by driving the driving end to move axially relative to the first connecting member (222).

7. A main bearing replacement tool according to claim 6, characterized in that: The driving end is connected to an adjustment rod (10) perpendicular to the axial direction of the driving rod (25) and is used for being handheld to rotate the driving rod (25).

8. A main bearing replacement tool according to claim 1, characterized in that: The side of the connecting plate (42) facing the ejector (41) has an arc surface matched with the outer circumferential surface of the crankshaft.

9. A main bearing replacement tool according to claim 1, characterized in that: The guide member (3) has a guide portion for guiding the main bearing cap, one end of the guide portion along the axial direction has a fixed end (8) connected to the base (1), and the other end of the guide member (3) along the axial direction has a connecting end (7) extending and connected to the internal threaded hole.

10. A main bearing replacement tool according to claim 9, characterized in that: At least part of the guide portion is provided with a mesh pattern (9) to prevent the guide member (3) from falling off in the axial direction when the guide member (3) is held by hand.

Images