Flywheel housing crankshaft center hole milling tool

Abstract

The utility model provides a milling tool for a central hole of a crankshaft of a flywheel housing. The plane side supporting and binding module is arranged on one side of the top end of the bottom plate through bolt connection; the arc-shaped side supporting and positioning module is connected to the side, away from the plane side supporting and binding module, of the top end of the bottom plate through bolts. The exhaust hole positioning module is arranged at the top end of the bottom plate through bolts in a connected mode and located between the plane side supporting and binding module and the arc side supporting and positioning module, and the bottom plate, the plane side supporting and binding module, the arc side supporting and positioning module and the exhaust hole positioning module are adopted. During use, exhaust holes in the left side and the right side of a flywheel casing casting needing to be machined are clamped into the top of a third supporting ejector rod in the exhaust hole positioning module, and a first air cylinder in the plane side supporting and binding module is driven to press a pressing head downwards so that one side of a flywheel casing connecting base can be limited to the top of a first supporting ejector rod; a second air cylinder in the arc-shaped side supporting and positioning module is driven to press a rubber block downwards so that one side of the arc-shaped shell of the flywheel shell can be limited to the top of a second supporting ejector rod.

Description

Technical Field

[0001] The utility model relates to the field of fine machining, in particular to the technical field of milling a center hole of a flywheel housing crankshaft, and specifically is a tool for milling a center hole of a flywheel housing crankshaft. Background Art

[0002] After the flywheel housing is formed by sand casting during processing, the crankshaft center hole in the middle of the flywheel housing has a high accuracy requirement, so it is necessary to subsequently improve the accuracy of the crankshaft center hole and the surface roughness of the hole wall through milling. However, since the inner wall of the flywheel housing is thin and the overall shape is complex, if conventional flat-nose pliers are used during milling, they cannot provide bottom support force, and the outer walls on both sides of the clamp are more likely to be deformed, reducing the qualified rate of the finished flywheel housing. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a flywheel housing crankshaft center hole milling tool to solve the difficulties of the prior art.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a flywheel housing crankshaft center hole milling tool, comprising:

[0005] Bottom plate 1;

[0006] A plane side support binding module 2, wherein the plane side support binding module 2 is arranged on one side of the top of the bottom plate 1 by bolt connection;

[0007] The arc-shaped side support positioning module 3 is arranged on the top of the bottom plate 1 away from the plane side support binding module 2 through bolt connection;

[0008] The exhaust hole positioning module 4 is arranged at the top of the bottom plate 1 between the plane side support binding module 2 and the arc side support positioning module 3 through bolt connection.

[0009] According to the preferred embodiment, the plane side support binding module 2 includes:

[0010] A No. 1 cylinder 21, which is symmetrically arranged on one side of the top of the bottom plate 1 through bolt connection, and a No. 1 cylinder arm 22 is passed through the middle of the top of the No. 1 cylinder 21;

[0011] The first rotating block 23 is arranged on the top of the first cylinder 21 and close to the central axis of the bottom plate 1 by welding;

[0012] A first driving rotating rod 24, wherein the first driving rotating rod 24 is disposed on the top of the first cylinder arm 22;

[0013] A pressure rod 25, one side of which is sleeved on the left and right sides of the driving rotating rod 24, a driving rotating rod 26 is arranged in the middle of the pressure rod 25, a pressure head 27 is arranged at the bottom of the pressure rod 25 away from the cylinder 21 through bolts, and the bottom of the pressure head 27 is rounded;

[0014] A first fixed rod 28, the first fixed rod 28 is inserted in the middle of the first rotating block 23;

[0015] A No. 1 connecting plate 29, the No. 1 connecting plate 29 is arranged on the left and right sides of the No. 1 pressure rod 25, the top of the No. 1 connecting plate 29 is sleeved on the left and right sides of the No. 1 driving rotating rod 26, and the bottom of the No. 1 connecting plate 29 is sleeved on the left and right sides of the No. 1 fixed rod 28;

[0016] A No. 1 support seat 210, the No. 1 support seat 210 is semicircular, the No. 1 support seat 210 is arranged on the top of the bottom plate 1 by bolt connection, and is located on the side of the No. 1 cylinder 21 close to the central axis of the bottom plate 1, and a threaded hole is opened in the middle of the No. 1 support seat 210;

[0017] The No. 1 support push rod 211 is arranged just below the pressure head 27 , and the bottom of the No. 1 support push rod 211 is threadedly fitted in the middle of the No. 1 support seat 210 .

[0018] According to the preferred solution, the No. 1 cylinder 21 drives the No. 1 cylinder arm 22 to move up and down, and the No. 1 cylinder arm 22 moves and drives the No. 1 pressure rod 25 to swing along the No. 1 driving rotating rod 24 as the rotation axis, and the No. 1 pressure rod 25 swings along the No. 1 driving rotating rod 26 as the rotation axis to make the pressure head 27 press down in the direction of the No. 1 supporting top rod 211.

[0019] According to the preferred embodiment, the arc-shaped side support positioning module 3 includes:

[0020] The second cylinder 31 is bolted and arranged on the top of the bottom plate 1 at a side away from the first cylinder 21, and a second cylinder arm 32 is provided in the middle of the top of the second cylinder 31;

[0021] A second rotating block 33, which is arranged on the top of the second cylinder 31 and close to the first cylinder 21 by welding;

[0022] A second driving rod 34, wherein the second driving rod 34 is disposed on the top of the second cylinder arm 32;

[0023] A second pressure rod 35, one side of which is sleeved on the left and right sides of the second driving rotating rod 34, a second driving rotating rod 36 is arranged in the middle of the second pressure rod 35, and a rubber block 37 is arranged in the middle of the bottom of the second pressure rod 35 by gluing;

[0024] A second fixed rod 38, the second fixed rod 38 is inserted in the middle of the second rotating block 33;

[0025] A second connecting plate 39, the second connecting plate 39 is arranged on the left and right sides of the second pressure rod 35, the top of the second connecting plate 39 is sleeved on the left and right sides of the second driving rotating rod 36, and the bottom of the second connecting plate 39 is sleeved on the left and right sides of the second fixed rod 38;

[0026] A second support seat 310, the second support seat 310 is bolted and arranged at the top of the bottom plate 1 and located on the side of the second cylinder 31 close to the first cylinder 21, and a threaded hole is opened in the middle of the second support seat 310;

[0027] The second support top rod 311 is arranged just below the rubber block 37 , and the bottom of the second support top rod 311 is threadedly fitted in the middle of the second support seat 310 .

[0028] According to the preferred solution, the No. 2 cylinder 31 drives the No. 2 cylinder arm 32 to move up and down, the No. 2 cylinder arm 32 moves and drives the No. 2 pressure rod 35 to swing along the No. 2 driving rotating rod 34 as the rotation axis, the No. 2 pressure rod 35 swings along the No. 2 driving rotating rod 36 as the rotation axis to press the rubber block 37 downward toward the No. 2 supporting top rod 311.

[0029] According to a preferred embodiment, the exhaust hole positioning module 4 includes:

[0030] A third support seat 41, the third support seat 41 is arranged between the second support seat 310 and the first support seat 210 by bolt connection, the third support seat 41 is arranged on the side of the third support seat 41 away from the central axis of the bottom plate 1, and a circular groove 42 is opened in the middle of the third support seat 41;

[0031] A sleeve 43, which is arranged at the center of the top of the third support seat 41 by welding, and a through hole 44 is arranged at the center of the sleeve 43;

[0032] A third support rod 45, wherein the outer diameter of the top of the third support rod 45 is greater than the outer diameter of the bottom, the bottom of the third support rod 45 is clamped at the top of the circular groove 42, the top of the third support rod 45 vertically passes through the through hole 44 and extends upward, and the top of the third support rod 45 is provided with a chamfer;

[0033] The buffer spring 46 is placed at the bottom of the circular groove 42 , and the top of the buffer spring 46 contacts the bottom of the third supporting top rod 45 .

[0034] According to a preferred embodiment, the outer diameter of the sleeve 43 is larger than the outer diameter of the circular groove 42 , and the diameter of the through hole 44 is smaller than the outer diameter of the circular groove 42 .

[0035] The utility model adopts a bottom plate, a plane side support binding module, an arc side support positioning module and an exhaust hole positioning module. When in use, the exhaust holes on the left and right sides of the flywheel housing casting to be processed are inserted into the top of the No. 3 support push rod in the exhaust hole positioning module, and the No. 1 cylinder in the plane side support binding module is driven to press the pressure head downward so that one side of the flywheel housing connecting seat is limited to the top of the No. 1 support push rod, and the No. 2 cylinder in the arc side support positioning module is driven to press the rubber block downward so that one side of the arc shell of the flywheel housing is limited to the top of the No. 2 support push rod; the following beneficial effects are achieved:

[0036] (1) During milling, the five-point support limiter provides sufficient support force to the flywheel housing to prevent the downward pressure of the milling cutter during processing from causing deformation of the flywheel housing;

[0037] (2) A buffer spring is set at the bottom of the No. 3 support rod to protect the shell with a thin inner wall and provide support force. At the same time, it reduces vibration during processing and improves processing accuracy;

[0038] The best embodiment of the present invention will be described in more detail below in conjunction with the accompanying drawings so that the features and advantages of the present invention can be easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The display is a three-dimensional structural schematic diagram of the utility model;

[0040] Figure 2 It shows a three-dimensional structural schematic diagram of the utility model after clamping the flywheel housing;

[0041] Figure 3 Shown is a schematic diagram of the structure of the first rotating block and the second rotating block in the present utility model;

[0042] Figure 4 Shown is an enlarged schematic diagram of the three-dimensional structure of the exhaust hole positioning module in the present utility model;

[0043] Figure 5 Shown is an enlarged schematic diagram of the three-dimensional structure of the through hole in the utility model;

[0044] Figure 6 Shown is an enlarged schematic diagram of the three-dimensional structure of the flywheel housing in the utility model;

[0045] Description of symbols

[0046] 1. Bottom plate;

[0047] 2. Plane side support binding module; 21. No. 1 cylinder; 22. No. 1 cylinder arm; 23. No. 1 rotating block; 24. No. 1 driving rotating rod; 25. No. 1 pressure rod; 26. No. 1 driving rotating rod; 27. Pressure head; 28. No. 1 fixed rod; 29. ​​No. 1 connecting plate; 210. No. 1 support seat; 211. No. 1 supporting top rod;

[0048] 3. Arc side support positioning module; 31. No. 2 cylinder; 32. No. 2 cylinder arm; 33. No. 2 rotating block; 34. No. 2 driving rotating rod; 35. No. 2 pressure rod; 36. No. 2 driving rotating rod; 37. Rubber block; 38. No. 2 fixed rod; 39. No. 2 connecting plate; 310. No. 2 support seat; 311. No. 2 supporting top rod;

[0049] 4. Exhaust hole positioning module; 41. No. 3 support seat; 42. Round groove; 43. Sleeve; 44. Through hole; 45. No. 3 support push rod; 46. Buffer spring. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the technical solution of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described in conjunction with the drawings of the specific embodiments of the utility model. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0051] Compared with the embodiments shown in the drawings, feasible implementations within the scope of protection of the present invention may have fewer components, other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0052] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate quantity restrictions. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0053] The utility model proposes a flywheel housing crankshaft center hole milling tool, which is used in the milling tool design process. The utility model does not limit the type of flywheel housing that needs to be finely machined, but the base plate 1, the plane side support binding module 2, the arc side support positioning module 3 and the exhaust hole positioning module 4 structure are particularly suitable for clamping the flywheel housing through a milling machine to finely machine the crankshaft center hole in the center of the flywheel housing.

[0054] In general, the flywheel housing crankshaft center hole milling tooling proposed in the utility model mainly includes: a base plate 1, a plane side support binding module 2, an arc side support positioning module 3 and an exhaust hole positioning module 4, which can be seen in Figure 2 , which shows the arrangement relationship of the base plate 1, the plane side support binding module 2, the arc side support positioning module 3 and the exhaust hole positioning module 4.

[0055] When the flywheel housing crankshaft center hole milling tool proposed by the utility model is used, the exhaust holes on the left and right sides of the flywheel housing casting to be processed are inserted into the top of the No. 3 support push rod 45 in the exhaust hole positioning module 4, and the No. 1 cylinder 21 in the plane side support binding module 2 is driven to press the pressure head 27 downward so that one side of the flywheel housing connecting seat is limited at the top of the No. 1 support push rod 211, and the No. 2 cylinder 31 in the arc side support positioning module 3 is driven to press the rubber block 37 downward so that one side of the arc-shaped shell of the flywheel housing is limited at the top of the No. 2 support push rod 311. A buffer spring 46 is arranged at the bottom of the No. 3 support push rod 45 in the exhaust hole positioning module 4 to protect the shell with a thinner inner wall and provide supporting force, while reducing vibration during processing and improving processing accuracy. During milling, sufficient supporting force is given to the flywheel housing through the five-point support limit to prevent deformation of the flywheel housing shell when fine milling the wall of the crankshaft center hole in the middle of the flywheel housing.

[0056] The above-mentioned plane side support binding module 2 is arranged on one side of the top of the base plate 1 through bolt connection, and the plane side support binding module 2 includes: a No. 1 cylinder 21, a No. 1 rotating block 23, a No. 1 driving rotating rod 24, a No. 1 pressing rod 25, a No. 1 fixed rod 28, a No. 1 connecting plate 29, a No. 1 supporting seat 210 and a No. 1 supporting top rod 211, wherein the No. 1 cylinder 21 is symmetrically arranged on one side of the top of the base plate 1 through bolt connection, and a No. 1 cylinder arm 22 is penetrated in the middle of the top of the No. 1 cylinder 21. A No. 1 rotating block 23 is welded on one side of the top of the No. 1 cylinder arm 22, a No. 1 driving rotating rod 24 is passed through the top of the No. 1 cylinder arm 22, a No. 1 pressure rod 25 is sleeved on the left and right sides of the No. 1 driving rotating rod 24, a No. 1 driving rotating rod 26 is arranged in the middle of the No. 1 pressure rod 25, a pressure head 27 is arranged on the bottom of the No. 1 pressure rod 25 away from the No. 1 cylinder 21, and a rounded corner is arranged around the bottom of the pressure head 27 to prevent it from hitting the surface of the flywheel housing casting, and a No. 1 fixed rod 28 is passed through a In the middle of the No. 1 rotating block 23, a No. 1 connecting plate 29 is arranged on the left and right sides of the No. 1 pressure rod 25, the top of the No. 1 connecting plate 29 is sleeved on the left and right sides of the No. 1 driving rotating rod 26, and the bottom of the No. 1 connecting plate 29 is sleeved on the left and right sides of the No. 1 fixed rod 28. The No. 1 supporting seat 210 is semicircular, and the No. 1 supporting seat 210 is arranged on the top of the bottom plate 1 through bolt connection, and is located on the side of the No. 1 cylinder 21 close to the central axis of the bottom plate 1. A threaded hole is opened in the middle of the No. 1 supporting seat 210, and a threaded hole is arranged directly below the pressure head 27. No. 1 support push rod 211, the bottom of No. 1 support push rod 211 is threadedly fitted in the middle of No. 1 support seat 210, No. 1 cylinder 21 drives No. 1 cylinder arm 22 to move up and down, No. 1 cylinder arm 22 moves to drive No. 1 pressure rod 25 to swing along No. 1 driving rotating rod 24 as the rotation axis, No. 1 pressure rod 25 swings along No. 1 driving rotating rod 26 as the rotation axis to make the pressure head 27 press down toward No. 1 support push rod 211, so that one side of the flywheel housing connecting seat is limited at the top of No. 1 support push rod 211.

[0057] The arc side support positioning module 3 is arranged at the top of the bottom plate 1 between the plane side support binding module 2 and the arc side support positioning module 3 through bolt connection. The arc side support positioning module 3 includes: a No. 2 cylinder 31, a No. 2 rotating block 33, a No. 2 driving rotating rod 34, a No. 2 pressure rod 35, a No. 2 fixed rod 38, a No. 2 connecting plate 39, a No. 2 support seat 310 and a No. 2 support top rod 311. The No. 2 cylinder 31 is arranged at the top of the bottom plate 1 away from the No. 1 cylinder 21 through bolt connection. The No. 2 cylinder 31 A No. 2 cylinder arm 32 is passed through the middle of the top, a No. 2 rotating block 33 is set by welding on the side of the top of the No. 2 cylinder 31 close to the No. 1 cylinder 21, a No. 2 driving rotating rod 34 is passed through the top of the No. 2 cylinder arm 32, one side of the No. 2 pressure rod 35 is sleeved on the left and right sides of the No. 2 driving rotating rod 34, a No. 2 driving rotating rod 36 is set in the middle of the No. 2 pressure rod 35, and a rubber block 37 is set in the middle of the bottom of the No. 2 pressure rod 35 by glue. Because the inner wall of the flywheel housing is thin, it provides support for the flywheel housing and protects the flywheel at the same time. The shell body prevents the flywheel shell body from deforming. A No. 2 fixed rod 38 is passed through the middle of the No. 2 rotating block 33. A No. 2 connecting plate 39 is arranged on the left and right sides of the No. 2 pressure rod 35. The top of the No. 2 connecting plate 39 is sleeved on the left and right sides of the No. 2 driving rotating rod 36. The bottom of the No. 2 connecting plate 39 is sleeved on the left and right sides of the No. 2 fixed rod 38. A No. 2 supporting seat 310 is arranged at the top of the bottom plate 1 and is located on the side of the No. 2 cylinder 31 close to the No. 1 cylinder 21 through bolt connection. A threaded hole is opened in the middle of the No. 2 supporting seat 310. The No. 2 supporting top rod 311 It is arranged just below the rubber block 37, and the bottom of the No. 2 support push rod 311 is threadedly fitted in the middle of the No. 2 support seat 310, and the No. 2 cylinder 31 drives the No. 2 cylinder arm 32 to move up and down, and the No. 2 cylinder arm 32 moves to drive the No. 2 pressure rod 35 to swing along the No. 2 driving rotating rod 34 as the rotation axis, and the No. 2 pressure rod 35 swings along the No. 2 driving rotating rod 36 as the rotation axis to press the rubber block 37 downward toward the No. 2 support push rod 311, so that one side of the arc-shaped shell of the flywheel housing is limited at the top of the No. 2 support push rod 311.

[0058] The exhaust hole positioning module 4 is arranged at the top of the bottom plate 1 between the plane side support binding module 2 and the arc side support positioning module 3 through bolt connection. The exhaust hole positioning module 4 includes: a No. 3 support seat 41, a sleeve 43, a No. 3 support top rod 45 and a buffer spring 46, wherein the No. 3 support seat 41 is arranged between the No. 2 support seat 310 and the No. 1 support seat 210 through bolt connection, and the No. 3 support seat 41 is arranged on the side of the No. 3 support seat 41 away from the central axis of the bottom plate 1, and a circular support seat 41 is opened in the middle of the No. 3 support seat 41. Groove 42, a sleeve 43 is set by welding in the middle of the top of the No. 3 support seat 41, a through hole 44 is set in the middle of the sleeve 43, the outer diameter of the sleeve 43 is larger than the outer diameter of the circular groove 42, the aperture of the through hole 44 is smaller than the outer diameter of the circular groove 42, the top outer diameter of the No. 3 support top rod 45 is larger than the bottom outer diameter, the bottom of the No. 3 support top rod 45 is clamped on the top of the circular groove 42, the top of the No. 3 support top rod 45 vertically passes through the through hole 44 and extends upward, a buffer spring 46 is placed at the bottom of the circular groove 42, and the top of the buffer spring 46 contacts the bottom of the No. 3 support top rod 45.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A flywheel housing crankshaft center hole milling tool, characterized in that: include: Bottom plate (1); A plane side support binding module (2), wherein the plane side support binding module (2) is arranged on one side of the top end of the base plate (1) by bolt connection; An arc-shaped side support positioning module (3), wherein the arc-shaped side support positioning module (3) is arranged on a side of the top of the base plate (1) away from the plane side support binding module (2) through bolt connection; An exhaust hole positioning module (4) is arranged at the top of the bottom plate (1) between the plane side support binding module (2) and the arc side support positioning module (3) through bolt connection.

2. The flywheel housing crankshaft center hole milling tool according to claim 1, characterized in that: The plane side support binding module (2) comprises: A No. 1 cylinder (21), the No. 1 cylinder (21) is symmetrically arranged on one side of the top of the bottom plate (1) through bolt connection, and a No. 1 cylinder arm (22) is passed through the middle of the top of the No. 1 cylinder (21); A first rotating block (23), the first rotating block (23) being arranged on a side of the top end of the first cylinder (21) close to the central axis of the bottom plate (1) by welding; A No. 1 driving rotating rod (24), wherein the No. 1 driving rotating rod (24) is disposed on the top of the No. 1 cylinder arm (22); A No. 1 pressure rod (25), one side of which is sleeved on the left and right sides of a No. 1 driving rotating rod (24), a No. 1 driving rotating rod (26) is arranged in the middle of the No. 1 pressure rod (25), a pressure head (27) is arranged at the bottom of the No. 1 pressure rod (25) away from the No. 1 cylinder (21) through bolt connection, and the bottom of the pressure head (27) is provided with rounded corners; A first fixed rod (28), the first fixed rod (28) is inserted in the middle of the first rotating block (23); A No. 1 connecting plate (29), the No. 1 connecting plate (29) is arranged on the left and right sides of the No. 1 pressure rod (25), the top of the No. 1 connecting plate (29) is sleeved on the left and right sides of the No. 1 driving rotating rod (26), and the bottom of the No. 1 connecting plate (29) is sleeved on the left and right sides of the No. 1 fixed rod (28); A No. 1 support seat (210), the No. 1 support seat (210) is semicircular, the No. 1 support seat (210) is arranged on the top of the base plate (1) and is located on the side of the No. 1 cylinder (21) close to the central axis of the base plate (1) through bolt connection, and a threaded hole is opened in the middle of the No. 1 support seat (210); A No. 1 support push rod (211), wherein the No. 1 support push rod (211) is arranged directly below the pressure head (27), and the bottom of the No. 1 support push rod (211) is threadedly fitted through the center of the No. 1 support seat (210).

3. The flywheel housing crankshaft center hole milling tool according to claim 2, characterized in that: The arc-shaped side support positioning module (3) comprises: A second cylinder (31), the second cylinder (31) is arranged on the top of the bottom plate (1) at a side away from the first cylinder (21) through bolt connection, and a second cylinder arm (32) is passed through the middle of the top of the second cylinder (31); A second rotating block (33), the second rotating block (33) being arranged on a side of the top of the second cylinder (31) close to the first cylinder (21) by welding; A second driving rotating rod (34), wherein the second driving rotating rod (34) is disposed on the top of the second cylinder arm (32); A second pressure rod (35), one side of which is sleeved on the left and right sides of the second driving rotating rod (34), a second driving rotating rod (36) is arranged in the middle of the second pressure rod (35), and a rubber block (37) is arranged in the middle of the bottom of the second pressure rod (35) by gluing; A second fixed rod (38), the second fixed rod (38) is inserted in the middle of the second rotating block (33); A second connecting plate (39), the second connecting plate (39) is arranged on the left and right sides of the second pressure rod (35), the top of the second connecting plate (39) is sleeved on the left and right sides of the second driving rotating rod (36), and the bottom of the second connecting plate (39) is sleeved on the left and right sides of the second fixed rod (38); A second support seat (310), the second support seat (310) is arranged at the top of the bottom plate (1) and located on the side of the second cylinder (31) close to the first cylinder (21) through bolt connection, and a threaded hole is opened in the middle of the second support seat (310); A second supporting top rod (311), the second supporting top rod (311) is arranged directly below the rubber block (37), and the bottom of the second supporting top rod (311) is threadedly fitted in the middle of the second supporting seat (310).

4. The flywheel housing crankshaft center hole milling tool according to claim 3, characterized in that: The exhaust hole positioning module (4) comprises: A third support seat (41), the third support seat (41) being arranged between the second support seat (310) and the first support seat (210) by bolt connection, the third support seat (41) being arranged on a side of the third support seat (41) away from the central axis of the bottom plate (1), and a circular groove (42) being provided in the middle of the third support seat (41); A sleeve (43), wherein the sleeve (43) is arranged at the center of the top end of the third support seat (41) by welding, and a through hole (44) is arranged at the center of the sleeve (43); A third support top rod (45), the outer diameter of the top of the third support top rod (45) is greater than the outer diameter of the bottom, the bottom of the third support top rod (45) is clamped on the top of the circular groove (42), the top of the third support top rod (45) vertically passes through the through hole (44) and extends upward, and the top of the third support top rod (45) is provided with a chamfer; A buffer spring (46) is placed at the bottom of the circular groove (42), and the top of the buffer spring (46) contacts the bottom of the third supporting top rod (45).

5. The flywheel housing crankshaft center hole milling tool according to claim 4, characterized in that: The outer diameter of the sleeve (43) is greater than the outer diameter of the circular groove (42), and the diameter of the through hole (44) is smaller than the outer diameter of the circular groove (42).

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