阅读说明：本技术 船用柴油机曲轴与飞轮配铰孔工装及铰孔方法 (Marine diesel engine crankshaft and flywheel matching reaming tool and reaming method ) 是由 尹建军 聂嘉良 庄磊 罗彬� 于 2021-09-09 设计创作，主要内容包括：本发明公开一种船用柴油机曲轴与飞轮配铰孔工装,包括铰模板、铰套压板、铰套、铰刀接杆、手用铰刀、台阶插销和铰孔限位装置,铰模板外缘设有一圈多个定位孔。铰套一端嵌入定位定位孔中,铰刀接杆与手用铰刀固定连接成一体,铰刀接杆外螺纹拧入铰套另一端的螺纹沉孔中,铰套压板套入固定在铰套一端上,台阶插销将铰模板、飞轮和曲轴端头板固定连接成一体,铰孔限位装置设置在铰模板和铰套压板上。方法包括1)安装飞轮,2)安装铰孔工装,3)铰孔。本发明在船舶机舱内不需拆除曲轴就能快速、安全、高效地实现曲轴和飞轮配铰孔操作,从而大大降低了船用柴油机的维修成本,明显缩短了维修周期,显著提高了船用柴油机的维修效率及维修质量。(The invention discloses a marine diesel engine crankshaft and flywheel reaming hole tool which comprises a reaming template, a reaming sleeve pressing plate, a reaming sleeve, a reaming cutter connecting rod, a manual reaming cutter, a step bolt and a reaming hole limiting device, wherein a circle of a plurality of positioning holes are formed in the outer edge of the reaming template. One end of the hinge sleeve is embedded into the positioning hole, the reamer connecting rod is fixedly connected with a hand reamer into a whole, external threads of the reamer connecting rod are screwed into a threaded counter bore at the other end of the hinge sleeve, the hinge sleeve pressing plate is sleeved and fixed on one end of the hinge sleeve, the hinge template, the flywheel and the crankshaft end plate are fixedly connected into a whole through a step bolt, and the hinge hole limiting device is arranged on the hinge template and the hinge sleeve pressing plate. The method comprises the steps of 1) installing the flywheel, 2) installing a reaming tool and 3) reaming. The invention can quickly, safely and efficiently realize the operation of the hinge hole of the crankshaft and the flywheel in the marine engine room without dismounting the crankshaft, thereby greatly reducing the maintenance cost of the marine diesel engine, obviously shortening the maintenance period and obviously improving the maintenance efficiency and the maintenance quality of the marine diesel engine.)

1. The utility model provides a marine diesel engine bent axle and flywheel join in marriage hinge hole frock which characterized in that: the device comprises a hinged template, a hinged sleeve pressing plate, a hinged sleeve, a reamer connecting rod, a manual reamer, a reamer wrench and a step bolt, wherein a circle of a plurality of positioning holes are formed in the outer edge of the hinged template and correspond to the positions of corresponding flywheel hinged bolt holes respectively; the diameter of the excircle of the hinged template is smaller than that of the flywheel pit, and a central boss of the hinged template is embedded and positioned in a central inner hole of the flywheel; one end of the reaming sleeve is embedded and positioned in a positioning hole of the reaming template, the handle of the hand reamer penetrates through one end of the reaming sleeve and then extends into a counter bore at one end of a reamer connecting rod, a plurality of inner hexagonal flat end set screws are respectively screwed into one end of the reamer connecting rod, one end of the reamer connecting rod and the hand reamer are fixedly connected into a whole, and a cutting edge guide part of the hand reamer extends into a flywheel reaming bolt hole; the external thread of the reamer connecting rod is screwed into the threaded counter bore at the other end of the reamer sleeve, and the central square hole of the reamer wrench is sleeved on the square head at the end head at the other end of the reamer connecting rod; the hinged sleeve pressing plate is sleeved and fixed on one end of the hinged sleeve and abuts against the hinged template; one end of the step bolt sequentially penetrates through the positioning hole of the hinge template, the flywheel bolt mounting hole and the through hole of the crankshaft end plate, and the hinge template, the flywheel and the crankshaft end plate are fixedly connected into a whole through a nut screwed at one end of the step bolt.

2. The marine diesel engine crankshaft and flywheel reaming tool of claim 1, characterized in that: the hinge sleeve is of a stepped shaft sleeve structure, a small end shaft sleeve at one end of the hinge sleeve is embedded into a positioning hole of the hinge template, a central hole of a hinge sleeve pressing plate is sleeved and positioned at one end of a large end shaft sleeve of the hinge sleeve, the hinge sleeve pressing plate is fixed at one end of the large end shaft sleeve of the hinge sleeve through a plurality of cone end fastening screws, and the hinge sleeve pressing plate is abutted against the hinge template; the reaming limiting device is arranged on the reaming template and the reaming sleeve pressing plate.

3. The marine diesel engine crankshaft and flywheel reaming tool of claim 2, characterized in that: the reaming limiting device comprises 2 arc-shaped grooves and 2 stepped screws, the arc-shaped grooves are respectively arranged on two sides of the central hole of the reaming sleeve pressing plate, and the arc center of the arc-shaped groove is coaxial with the central hole of the reaming sleeve pressing plate; the optical axis diameter of ladder screw one end is greater than the screw rod diameter of the ladder screw other end, and optical axis length L is greater than hinge cover clamp plate thickness H, and L-H =0.7 ~ 1.0 mm.

4. The marine diesel engine crankshaft and flywheel reaming tool of claim 3, characterized in that: one end of the arc-shaped groove is a round hole with the diameter larger than that of the end cap of the step screw, and the groove width C at the other end of the arc-shaped groove is in clearance fit with the optical axis in the middle of the step screw; and the screw rods at the other ends of the stepped screws are respectively screwed into the threaded holes at two sides of the positioning hole of the hinge template.

5. The marine diesel engine crankshaft and flywheel reaming tool of claim 3, characterized in that: the included angle alpha = 30-35 degrees between the centers of the two ends of the arc-shaped groove.

6. The reaming method for the reaming tool for the crankshaft and the flywheel of the marine diesel engine according to claim 1, characterized by comprising the following steps: the method comprises the following steps:

1) installing a flywheel, hoisting the replaced flywheel out of the crankshaft end head plate, aligning pin holes of the flywheel and inserting cylindrical stepped pins, so that the flywheel is positioned on the crankshaft end head plate; then inserting 3 positioning bolts into the flywheel and the crankshaft end plate respectively, and screwing nuts at the ends of the positioning bolts respectively, so as to position and fix the flywheel on the crankshaft end plate, and then taking out the cylindrical stepped pin;

2) mounting a reaming tool, namely firstly hoisting a reaming template to the outer side of the flywheel, then sequentially enabling one end of a step bolt to pass through a positioning hole of the reaming template, a flywheel bolt mounting hole and a through hole of a crankshaft end plate, and fixedly connecting the reaming template, the flywheel and the crankshaft end plate into a whole through a nut screwed on one end of the step bolt;

the hinge sleeve pressing plate is positioned on the positioning hole of the hinge template and corresponds to the position of a flywheel to be hinged; step screws are respectively screwed into threaded holes at two sides of a positioning hole of a hand reamer to be penetrated through a reaming template, and then arc-shaped grooves of a reaming sleeve pressing plate are respectively sleeved on an optical axis at the middle part of the step screw of the step screws;

assembling a hand reamer, a reamer connecting rod and a hinge sleeve assembly, penetrating a handle of the hand reamer through one end of the hinge sleeve and then extending into a counter bore at one end of the reamer connecting rod, and then respectively screwing 4 inner hexagonal flat end set screws into one end of the reamer connecting rod so as to fixedly connect one end of the reamer connecting rod and the hand reamer into a whole; then, sequentially penetrating the cutting edge part of the hand reamer through the threaded counter bore of the hinge sleeve, and rotating the reamer connecting rod to ensure that the external thread of the reamer connecting rod is screwed with the threaded counter bore of the large-end shaft sleeve of the hinge sleeve;

one end of a large-end shaft sleeve of the reaming sleeve is inserted into a central hole of a reaming sleeve pressing plate, the reaming sleeve pressing plate is fixed on one end of the large-end shaft sleeve of the reaming sleeve through a plurality of cone end fastening screws, a square head at the other end of a reamer connecting rod is pulled by a wrench, and the combined body of the reamer connecting rod and a hand reamer moves towards a flywheel reaming bolt hole while rotating until a cutting edge guide part of the hand reamer extends into the flywheel reaming bolt hole to be reamed;

3) reaming a flywheel reaming bolt hole and a crankshaft end plate reaming bolt hole, sleeving a central square hole of a reamer spanner on a square head at the end head of the other end of a reamer connecting rod, tightly pressing and rotating the reamer spanner by force, and driving a reamer, a reaming sleeve and a reaming sleeve pressing plate to rotate around the axis of a hand reamer by the reamer connecting rod; the arc-shaped groove on the reaming pressing plate enables the rotation angle of the reamer to be within the range of 30-35 degrees, the reamer rotates clockwise 30-35 degrees for reaming and then rotates anticlockwise 30-35 degrees for a plurality of times until reaming is finished.

Technical Field

The invention relates to a manual reaming device, in particular to a tool and a method for quickly matching and reaming a crankshaft and a flywheel during flywheel replacement operation in a narrow space of a ship cabin, and belongs to the technical field of diesel engine maintenance.

Background

The crankshaft and the flywheel are important parts for stable and safe operation of the diesel engine, and are fixedly connected into a whole through a circle of a plurality of hinged bolts and nuts in the manufacturing and assembling process of the diesel engine. In order to install the hinge bolt, a circle of a plurality of hinge bolt holes are required to be hinged on the flywheel and the crankshaft end head plate. During processing, respectively drilling a bottom hole of a hinged bolt hole on the flywheel and the crankshaft end plate, then fixedly connecting the crankshaft and the flywheel through 3 bolt nuts, and then drilling holes in the crankshaft end plate and the flywheel together through a machine tool so as to ensure that the crankshaft and the flywheel can be finally fixedly connected in an interference fit manner by using the hinged bolt nuts.

In the running process of the diesel engine, if serious quality problems such as flywheel cracks or reamed hole bolt breakage occur, the running safety, the whole machine performance, the service life and the like of the diesel engine are affected very badly, the diesel engine needs to be stopped immediately to replace a new flywheel, and the new flywheel and the crankshaft end plate are matched with a reamed hole. A new hinge bolt can be installed.

The process of the existing marine diesel engine for replacing the flywheel and the crankshaft reaming hole is as follows: the method comprises the steps of firstly detaching a flywheel to be replaced from a crankshaft, then taking out the crankshaft from a rack after a diesel engine is disassembled, then hoisting the flywheel and the crankshaft out of a ship cabin, sending the flywheel and the crankshaft to a maintenance workshop after the flywheel and the crankshaft end plate are fixedly connected, then using a machine tool to complete reaming on the flywheel and the crankshaft end plate together, and hoisting the flywheel and the crankshaft end plate to the ship cabin for installation after machining is finished. Consumes a large amount of manpower and material resources and has low maintenance efficiency.

Disclosure of Invention

The invention aims to provide a marine diesel engine crankshaft and flywheel reaming tool and a reaming method, which can complete the reaming operation of a crankshaft and a replaced flywheel in a marine engine cabin without disassembling a diesel engine.

The invention is realized by the following technical scheme:

a marine diesel engine crankshaft and flywheel reaming hole tool comprises a reaming template, a reaming sleeve pressing plate, a reaming sleeve, a reamer connecting rod, a manual reamer, a reamer wrench and a step bolt, wherein a circle of a plurality of positioning holes are formed in the outer edge of the reaming template and correspond to corresponding flywheel reaming bolt holes respectively; the diameter of the excircle of the hinged template is smaller than that of the flywheel pit, and a central boss of the hinged template is embedded and positioned in a central inner hole of the flywheel; one end of the reaming sleeve is embedded and positioned in a positioning hole of the reaming template, the handle of the hand reamer penetrates through one end of the reaming sleeve and then extends into a counter bore at one end of a reamer connecting rod, a plurality of inner hexagonal flat end set screws are respectively screwed into one end of the reamer connecting rod, one end of the reamer connecting rod and the hand reamer are fixedly connected into a whole, and a cutting edge guide part of the hand reamer extends into a flywheel reaming bolt hole; the external thread of the reamer connecting rod is screwed into the threaded counter bore at the other end of the reamer sleeve, and the central square hole of the reamer wrench is sleeved on the square head at the end head at the other end of the reamer connecting rod; the hinged sleeve pressing plate is sleeved and fixed on one end of the hinged sleeve and abuts against the hinged template; one end of the step bolt sequentially penetrates through the positioning hole of the hinge template, the flywheel bolt mounting hole and the through hole of the crankshaft end plate, and the hinge template, the flywheel and the crankshaft end plate are fixedly connected into a whole through a nut screwed at one end of the step bolt.

The object of the invention is further achieved by the following technical measures.

Furthermore, the hinge sleeve is of a stepped shaft sleeve structure, a small end shaft sleeve at one end of the hinge sleeve is embedded into a positioning hole of the hinge template, a central hole of a hinge sleeve pressing plate is sleeved and positioned at one end of a large end shaft sleeve of the hinge sleeve, the hinge sleeve pressing plate is fixed at one end of the large end shaft sleeve of the hinge sleeve through a plurality of cone end set screws, and the hinge sleeve pressing plate abuts against the hinge template; the reaming limiting device is arranged on the reaming template and the reaming sleeve pressing plate.

Further, the reaming limiting device comprises 2 arc-shaped grooves and 2 stepped screws, the arc-shaped grooves are respectively arranged on two sides of the central hole of the reaming sleeve pressing plate, and the arc centers of the arc-shaped grooves are coaxial with the central hole of the reaming sleeve pressing plate; the optical axis diameter of ladder screw one end is greater than the screw rod diameter of the ladder screw other end, and optical axis length L is greater than hinge cover clamp plate thickness H, and L-H =0.7 ~ 1.0 mm.

Furthermore, one end of the arc-shaped groove is a round hole with a diameter larger than that of the end cap of the step screw, and the groove width C at the other end of the arc-shaped groove is in clearance fit with the optical axis in the middle of the step screw; and the screw rods at the other ends of the stepped screws are respectively screwed into the threaded holes at two sides of the positioning hole of the hinge template. The included angle alpha = 30-35 degrees between the centers of the two ends of the arc-shaped groove.

A reaming method for a marine diesel engine crankshaft and flywheel matching reaming tool comprises the following steps:

1) installing a flywheel, hoisting the replaced flywheel out of the crankshaft end head plate, aligning pin holes of the flywheel and inserting cylindrical stepped pins, so that the flywheel is positioned on the crankshaft end head plate; then inserting 3 positioning bolts into the flywheel and the crankshaft end plate respectively, and screwing nuts at the ends of the positioning bolts respectively, so as to position and fix the flywheel on the crankshaft end plate, and then taking out the cylindrical stepped pin;

2) mounting a reaming tool, namely firstly hoisting a reaming template to the outer side of the flywheel, then sequentially enabling one end of a step bolt to pass through a positioning hole of the reaming template, a flywheel bolt mounting hole and a through hole of a crankshaft end plate, and fixedly connecting the reaming template, the flywheel and the crankshaft end plate into a whole through a nut screwed on one end of the step bolt;

the hinge sleeve pressing plate is positioned on the positioning hole of the hinge template and corresponds to the position of a flywheel to be hinged; step screws are respectively screwed into threaded holes at two sides of a positioning hole of a hand reamer to be penetrated through a reaming template, and then arc-shaped grooves of a reaming sleeve pressing plate are respectively sleeved on an optical axis at the middle part of the step screws;

assembling a hand reamer, a reamer connecting rod and a hinge sleeve assembly, penetrating a handle of the hand reamer through one end of the hinge sleeve and then extending into a counter bore at one end of the reamer connecting rod, and then respectively screwing 4 inner hexagonal flat end set screws into one end of the reamer connecting rod so as to fixedly connect one end of the reamer connecting rod and the hand reamer into a whole; then, sequentially penetrating the cutting edge part of the hand reamer through the threaded counter bore of the hinge sleeve, and rotating the reamer connecting rod to ensure that the external thread of the reamer connecting rod is screwed with the threaded counter bore of the large-end shaft sleeve of the hinge sleeve;

one end of a large-end shaft sleeve of the reaming sleeve is inserted into a central hole of a reaming sleeve pressing plate, the reaming sleeve pressing plate is fixed on one end of the large-end shaft sleeve of the reaming sleeve through a plurality of cone end fastening screws, a square head at the other end of a reamer connecting rod is pulled by a wrench, and a combined body of the reamer connecting rod and a hand reamer moves towards a flywheel reaming bolt hole while rotating until a cutting edge guide part of the hand reamer extends into a flywheel reaming bolt hole to be reamed;

3) reaming a flywheel reaming bolt hole and a reaming bolt hole of a crankshaft end plate, sleeving a central square hole of a reamer spanner on a square head at the end head of the other end of a reamer connecting rod, tightly pressing and rotating the reamer spanner by force, and driving a hand reamer, a reaming sleeve and a reaming sleeve pressing plate to rotate around the axis of the reamer by the reamer connecting rod; the arc-shaped groove on the reaming sleeve pressing plate enables the rotation angle of the hand reamer to be within the range of 30-35 degrees, the hand reamer rotates clockwise 30-35 degrees for reaming and then rotates anticlockwise 30-35 degrees for a plurality of times until reaming is finished.

The tool is in a compact structure formed by fixedly connecting the hinge template, the hinge sleeve pressing plate, the hinge sleeve, the reamer connecting rod and the hand reamer into a whole, and the method can quickly, safely and efficiently realize the operation of matching hinge holes of the crankshaft and the flywheel without dismounting the crankshaft in a narrow space of a marine engine room, thereby greatly reducing the maintenance cost of the marine diesel engine, obviously shortening the maintenance period and obviously improving the maintenance efficiency and the maintenance quality of the marine diesel engine.

Advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a block diagram of a cylindrical step pin inserted and positioned on the flywheel and crankshaft;

FIG. 4 is an enlarged sectional view A-A of FIG. 1;

fig. 5 is an enlarged sectional view B-B of fig. 4.

Detailed Description

The invention is further illustrated by the following figures and examples.

As shown in fig. 1 to 5, the present embodiment includes a hinge template 1, a hinge sleeve pressing plate 2, a hinge sleeve 3, a reamer connecting rod 4, a hand reamer 5, a reamer wrench 6 and a step bolt 7, wherein the hinge template 1 is a disc structure, and a circle of 12 positioning holes 11 for positioning the hinge sleeve 3 are formed in the outer edge of the hinge template 1, and the positioning holes 11 respectively correspond to the corresponding flywheel hinge bolt holes 103. The diameter of the excircle of the hinging template 1 is smaller than that of the flywheel pit 101, and the central boss 12 of the hinging template is embedded and positioned in the central inner hole 102 of the flywheel. In fig. 1, a hinge sleeve 3 is of a stepped shaft sleeve structure, a small end shaft sleeve 32 at the left end of the hinge sleeve 3 is embedded in a positioning hole 11 of a hinge template 1, a handle part 51 at the right end of a hand reamer 5 penetrates through the left end of the hinge sleeve 1 and then extends into a counter bore 41 at the left end of a reamer connecting rod 4, 4 inner hexagonal flat end fastening screws 42 are respectively screwed into the right end of the reamer connecting rod 4, the end of each inner hexagonal flat end fastening screw 42 is respectively abutted against the handle part 51 at the right end of the hand reamer 5, the left end of the reamer connecting rod 4 is fixedly connected with the hand reamer 5 into a whole, and a cutting edge guide part 52 of the hand reamer 5 extends into a flywheel reaming bolt hole 103. The external thread of the reamer connecting rod 4 is screwed into the threaded counter bore 31 at the right end of the reaming sleeve 3, and the central square hole 61 of the reamer wrench 6 is sleeved on the square head 43 at the end head at the right end of the reamer connecting rod 4.

The central hole 21 of the hinge sleeve pressing plate is sleeved and positioned on the left end of the large-end shaft sleeve 33 of the hinge sleeve 3, the hinge sleeve pressing plate 2 is fixed on the left end of the large-end shaft sleeve 33 of the hinge sleeve 3 through 2 conical-end fastening screws 22, and the hinge sleeve pressing plate 2 is abutted against the hinge template 1.

One end of the step bolt 7 sequentially penetrates through the positioning hole 11 of the hinge template 1, the flywheel bolt mounting hole 103 and the through hole 202 of the crankshaft end plate 201, and the hinge template 1, the flywheel 10 and the crankshaft end plate 201 are fixedly connected into a whole through a nut 71 screwed at the end head of the left end of the step bolt 7.

The reaming limiting device 8 is arranged on the reaming template 1 and the reaming sleeve pressing plate 2 and comprises 2 arc-shaped grooves 23 and 2 stepped screws 81, the arc-shaped grooves 23 are respectively arranged on two sides of a central hole 21 of the reaming sleeve pressing plate, and the arc center of the arc-shaped groove 23 is coaxial with the central hole 21 of the reaming sleeve pressing plate. As shown in fig. 5, the diameter of an optical axis 811 at one end of the stepped screw 81 is larger than the diameter of a screw 812 at the other end of the stepped screw 81, the length L of the optical axis 811 is larger than the thickness H of the hinge sleeve pressing plate 2, and L-H = 0.7-1.0 mm, so that the hinge sleeve pressing plate 2 can swing on the hinge template 1 conveniently. One end of the arc-shaped groove 23 is a round hole with the diameter larger than that of the stepped screw end cap 813, the groove width C at the other end of the arc-shaped groove 23 is in clearance fit with the optical axis 811 in the middle of the stepped screw 82, and the screw 812 at the other end of the stepped screw 81 is screwed into the threaded holes 13 at two sides of the positioning hole 11 of the hinging template 1 respectively. When the hinge sleeve pressing plate 2 swings around the center of the flywheel bolt mounting hole 103 for reaming, the optical axis 811 at one end of the stepped screw 81 plays a role in guiding, and the reaming precision is improved. The included angle alpha =30 ~ 35 of the both ends center of arc groove 23, such structure can restrict the turned angle when reamer 6 reams earlier, improves the pore wall quality after the reamed.

A reaming method for a marine diesel engine crankshaft and flywheel matching reaming tool comprises the following steps:

1) the flywheel 10 is installed and, as shown in fig. 4, a replacement flywheel 10 is lifted out of the crankshaft end plate 201, and the cylindrical step pins 9 are inserted after aligning the pin holes of each other so that the flywheel 10 is positioned on the crankshaft end plate 201. Then 3 positioning bolts are respectively inserted into the connecting flywheel 10 and the crankshaft end plate 201, nuts 71 at the ends of the positioning bolts are respectively screwed, so that the flywheel 10 is positioned and fixed on the crankshaft end plate 201, and then the cylindrical stepped pin 9 is taken out.

2) The reaming tool is installed, the reaming template 1 is hoisted to the outer side of the flywheel 10, then the left end of the step bolt 7 sequentially penetrates through the positioning hole 11 of the reaming template 1, the flywheel bolt installation hole 103 and the through hole 202 of the crankshaft end plate 201, and the reaming template 1, the flywheel 10 and the crankshaft end plate 201 are fixedly connected into a whole through the nut 71 screwed on the left end of the step bolt 7.

The hinge sleeve pressing plate 2 is positioned on the positioning hole 11 of the hinge template 1 and corresponds to the position of a flywheel 10 to be hinged. The stepped screws 81 are respectively screwed into the threaded holes 13 of the hand reamer 5 which are going to pass through the two sides of the positioning hole 11 of the reaming template 1, and then the arc-shaped grooves 23 of the reaming sheath pressing plate 2 are respectively sleeved on the optical axis 811 at the middle part of the stepped screws 81.

The assembly of the hand reamer 5, the reamer connecting rod 4 and the hinge sleeve 3 is assembled, the handle part 51 of the hand reamer 5 penetrates through one end of the hinge sleeve 3 and then extends into the counter bore 41 at one end of the reamer connecting rod 4, and then 4 inner hexagonal flat end set screws 42 are respectively screwed into one end of the reamer connecting rod 4, so that one end of the reamer connecting rod 4 and the hand reamer 5 are fixedly connected into a whole. Then, the cutting edge part of the hand reamer 5 sequentially penetrates through the threaded counter bore 31 of the hinge sleeve 3, and the reamer connecting rod 4 is rotated, so that the external thread of the reamer connecting rod 4 is screwed with the threaded counter bore 31 of the large-end shaft sleeve 33 of the hinge sleeve 3.

The left end of a large-end shaft sleeve 33 of a hinge sleeve 3 is inserted into a center hole 21 of a hinge sleeve pressing plate, the hinge sleeve pressing plate 2 is fixed on the left end of the large-end shaft sleeve 33 of the hinge sleeve 3 through 2 conical-end fastening screws 22, a square head 43 at the end of the left end of a reamer connecting rod 4 is pulled by a wrench, the combined body of the reamer connecting rod 4 and a hand reamer 5 moves towards a flywheel hinge bolt hole 202 while rotating until a cutting edge guide part 52 of the hand reamer 5 extends into a flywheel hinge bolt hole 103 needing to be reamed.

3) Reaming bolt holes 103 of a flywheel and 202 of a crankshaft end plate 201, sleeving a central square hole 61 of a reamer wrench 6 on a square head 43 at the end of the right end of a reamer connecting rod 4, tightly pressing and rotating the reamer wrench 6, and driving a reamer 5, a hinge sleeve 3 and a hinge sleeve pressing plate 2 to rotate around the axis of the hand reamer 5 by the reamer connecting rod 4. The arc-shaped groove 23 on the reaming sleeve pressing plate 2 ensures that the rotation angle of the hand reamer 4 is within the range of 30-35 degrees, the hand reamer 4 rotates clockwise 30-35 degrees for reaming and then rotates anticlockwise 30-35 degrees for a plurality of times until reaming is finished.

In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.