Crankshaft rear oil seal assembly tool

Abstract

The utility model relates to the technical field of engine assembly equipment, and particularly discloses a crankshaft rear oil seal assembly tool which is used for horizontally pushing an oil seal into an annular groove between a flange plate and an engine shell. Comprising a guide seat, a pressing seat and a press-fitting bolt, the guide seat comprises a mounting head and a guide rod which are coaxially connected, the end, away from the guide rod, of the mounting head is coaxially connected with the flange disc, and the outer diameter of the mounting head is equal to the inner diameter of the groove; the pressing seat comprises a pressing ring and a guide ring which are coaxially connected, the guide rod is slidably sleeved with the guide ring, the mounting head is slidably sleeved with the pressing ring, a through hole is coaxially formed in the end, away from the pressing ring, of the guide ring, and the threaded part of the press-fitting bolt penetrates through the through hole and then is in threaded connection with the guide rod; the problems that due to the fact that the oil seal is difficult to be coaxially aligned with the groove and the state of the inner lip is difficult to observe due to the fact that the inner lip is blocked by a crankshaft or an assembly tool, the inner lip is damaged occasionally, the oil seal loses efficacy, and the overall installation efficiency is low are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine assembly equipment, in particular to a crankshaft rear oil seal assembly tool. Background Art

[0002] The rear end of the crankshaft, the section after the last main journal, features a flanged plate for mounting the flywheel. To prevent oil from leaking backward, a return thread or other oil-sealing device is typically cut into the rear end of the crankshaft. The rear crankshaft oil seal is a component that seals the rear end of the crankshaft, preventing oil from leaking through the flanged plate. In a typical engine design, the rear crankshaft oil seal is first press-fitted onto a separate rear oil seal seat using a tool. The crankshaft rear oil seal seat assembly is then assembled to the rear end of the cylinder block using a guide tool.

[0003] Most of the existing engine crankshaft rear oil seals do not have an independent oil seal seat, so the oil seal needs to be directly assembled into the annular groove between the flange plate on the engine crankshaft and the engine housing; TC oil seals are generally used now, which are double-lip oil seals with a self-tightening spring that are completely covered with rubber. The oil seals generally refer to this TC skeleton oil seal; in the natural state, the end opening size of the inner and outer lips of the oil seal is larger than the width of the annular groove between the flange plate and the engine housing where the oil seal is to be installed. After the oil seal is installed, the inner and outer lips of the oil seal can respectively abut against the flange plate and the engine housing, thereby achieving sealing of the engine oil.

[0004] Currently, when installing an oil seal, workers need to align the oil seal coaxially with the annular groove. In order to prevent the oil seal from being damaged due to the oil seal lips not entering the groove in time due to pushing it in too quickly, the oil seal is usually initially aligned and then slowly pushed into the groove to check whether the outer lip enters the groove smoothly. Then, the oil seal is slowly pushed horizontally to avoid damaging the inner lip while ensuring that the outer lip enters smoothly. However, since the oil seal is difficult to align coaxially with the groove and the inner lip is blocked by the crankshaft or assembly tooling, it is difficult to observe the status of the inner lip, resulting in occasional damage to the inner lip, causing oil seal failure, and the overall installation efficiency is low. Utility Model Content

[0005] The purpose of the utility model is to provide a crankshaft rear oil seal assembly tooling, which solves the problems of occasional damage to the inner lip and failure of the oil seal due to the difficulty in aligning the oil seal coaxially with the groove and the obstruction of the inner lip by the crankshaft or the assembly tooling, and the low efficiency of the overall installation.

[0006] The utility model is realized by the following technical solutions: a crankshaft rear oil seal assembly tool is used to push the oil seal horizontally into the annular groove between the flange plate and the engine housing;

[0007] The guiding seat comprises a mounting head coaxially connected with a guiding rod, and the mounting head is coaxially connected with the flange disc at the end away from the guiding rod, and the outer diameter of the mounting head is the same as the inner diameter of the groove.

[0008] The pressing seat comprises a pressing ring coaxially connected with a guiding ring, the guiding ring is slidingly sleeved on the guiding rod, the pressing ring is slidingly sleeved on the mounting head, the guiding ring is coaxially provided with a through hole at the end away from the pressing ring, and the threaded part of the pressing bolt is threadedly connected with the guiding rod after passing through the through hole.

[0009] The pressing ring is coaxially provided with a pushing ring at the end away from the guiding ring, the pushing ring is clearance-fitted with the mounting head, and the ring width of the pushing ring is greater than the groove width of the groove.

[0010] The end of the mounting head is coaxially provided with a butt joint groove, and the end of the flange disc is integrally provided with a convex circular table, and the circular table is clearance-fitted with the butt joint groove.

[0011] Further, a guide ring is slidingly arranged in the inner cavity of the pressing ring, and the inner diameter of the guide ring is not less than the outer diameter of the flange disc.

[0012] A plurality of long sliding holes are arranged in an annular array on the side wall of the pressing ring, the long sliding holes are parallel to the axis of the pressing ring, a plurality of sliding blocks are arranged in an annular array on the guide ring, a driving ring is sleeved outside the pressing ring, and the plurality of sliding blocks are respectively extended out of the plurality of long sliding holes and connected with the driving ring.

[0013] Further, a spring is sleeved on the pressing ring, and the two ends of the spring are respectively abutted with the driving ring and the pushing ring.

[0014] Further, the end of the guide ring close to the flange disc is provided with a tapered ring, and the end of the tapered ring is provided in a circular arc shape.

[0015] Further, the mounting head is in the shape of a circular table, and the end with a small diameter of the mounting head is connected with the guiding rod.

[0016] Further, a plurality of lock holes are arranged in an annular array on the mounting head, an installation bolt is arranged in one of the lock holes, and the threaded segment of the installation bolt is threadedly connected with the flange disc.

[0017] A convex limiting part is integrally arranged on the installation bolt, and the limiting part is abutted with the mounting head after the threaded segment is connected with the flange disc.

[0018] Further, the mounting bolt further comprises an extension column, which is coaxially arranged at one end of the limiting portion away from the threaded segment, and the extension column is slidably arranged out of the compression ring;

[0019] The extension column is provided with a first hexagonal head at one end away from the limiting portion.

[0020] Further, the press-fit bolt is provided with a second hexagonal head at one end away from the guide rod.

[0021] Further, the press-fit bolt is integrally provided with a driving cap, and the driving cap is provided with a convex ring at one end close to the guide ring, and the diameter of the convex ring is greater than the diameter of the through hole.

[0022] Further, a gasket is further included, which is sleeved on the press-fit bolt and located between the convex ring and the guide ring.

[0023] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0024] 1. After the guide seat and the flange disc are coaxially connected, the oil seal to be installed can be first sleeved on the guide rod and then installed on the mounting head, the compression seat is sleeved on the guide seat, and the gasket and the press-fit bolt are installed; then the press-fit bolt is adjusted to rotate by using a wrench, and then the oil seal can be pushed flat by the compression seat.

[0025] 2. The mounting head is in the shape of a circular truncated cone, and the end close to the guide rod is thin, which helps the oil seal to be sleeved on the mounting head; when the oil seal moves to the end of the flange disc on the mounting head, the end of the mounting head has the same diameter as the end of the flange disc, so that the oil seal is coaxial with the flange disc and the groove when the oil seal is separated from the mounting head and enters the groove, and then the oil seal can be made to enter the groove by being continuously pushed flat.

[0026] 3. The end of the mounting head is coaxially provided with a butt joint groove, and the end of the flange disc is integrally provided with a convex circular truncated cone; the circular truncated cone and the butt joint groove are in clearance fit, so that when the guide seat is installed, the groove can be first sleeved on the circular truncated cone, and after the circular truncated cone is inserted into the groove, the guide seat is preliminarily coaxial with the flange disc; then the mounting bolt is only needed to be installed in place to connect the mounting head and the flange disc.

[0027] 4. The extension column is arranged out of the compression ring, which can prevent the compression ring from rotating when the press-fit bolt drives the compression seat to push the oil seal on the guide seat, and the compression ring cannot rotate and cannot produce rotating friction with the oil seal, thereby avoiding damage to the oil seal; in addition, the extension column can also guide part of the compression ring, and the guide ring and the guide rod are cooperatively guided, so that the compression seat does not deviate from the axis of the flange disc when pushing the oil seal, thereby ensuring the translation of the oil seal and preventing the oil seal from being damaged, and also ensuring the flatness and perpendicularity of the oil seal after being installed in place.

[0028] 5. By driving the driving ring to move to one side of the flange plate, the guide ring inside the compression ring moves along the inner cavity of the compression ring, first abuts the dustproof lip of the oil seal, forces the inner lip to move into the groove, if still not, continue to drive the guide ring to move, the guide ring contacts the side wall of the inner lip after passing through the dustproof lip, forces the inner lip to enter the groove, further ensures that the inner lip and the outer lip of the oil seal can smoothly enter the groove, provides a prior condition for subsequent flat pushing of the oil seal, and the oil seal will not be damaged.

[0029] 6. Due to partial machining or installation error, sometimes it is difficult to keep coaxial after the guide seat and the flange plate are installed, at this time, the guide ring can be driven to move into the groove before the oil seal is flat pushed, if the guide ring cannot smoothly enter the groove, it indicates that there is machining or installation error, and after the worker checks and adjusts, further provides a judgment basis for whether to continue to install the oil seal or judge that the flange plate is unqualified. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 A sectional view structure schematic diagram of the crankshaft rear oil seal assembly tool provided by the present application is shown in the figure.

[0032] Figure 2 A sectional view structure schematic diagram of the crankshaft rear oil seal assembly tool provided by the present application is shown in the figure. Figure 1 An enlarged schematic diagram of the structure at C in the figure.

[0033] Figure 3 A sectional view structure schematic diagram of the crankshaft rear oil seal assembly tool provided by the present application is shown in the figure. Figure 1 An enlarged schematic diagram of the structure at C in the figure.

[0034] Figure 4 An enlarged schematic diagram of the structure at C in the figure. Figure 1 An enlarged schematic diagram of the structure at C in the figure.

[0035] Icon: 1, oil seal, 11, inner lip, 12, outer lip, 13, dust lip, 2, flange plate, 21, circular table, 3, engine housing, 4, groove, 5, guide seat, 51, mounting head, 511, butt joint groove, 512, lock hole, 52, guide rod, 53, mounting bolt, 531, threaded section, 532, limiting portion, 533, extension column, 534, first hexagonal head, 6, pressing seat, 61, pressing ring, 611, long sliding hole, 62, guide ring, 621, through hole, 63, pushing ring, 7, pressing bolt, 71, second hexagonal head, 72, driving cap, 73, convex ring, 74, gasket, 8, guide ring, 81, sliding block, 82, driving ring, 83, spring, 84, taper ring. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be a clear and complete description of the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0038] Referring to Figures 1 to 4 The present embodiment provides a crankshaft rear oil seal assembly tool for pushing the oil seal 1 into the annular groove 4 between the flange plate 2 and the engine housing 3. The assembly tool mainly comprises a guide seat 5, a pressing seat 6, and a pressing bolt 7. More specifically, the guide seat 5 comprises a mounting head 51 and a guide rod 52 connected coaxially, the mounting head 51 is connected coaxially with the flange plate 2 at the end away from the guide rod 52, a plurality of lock holes 512 are annularly arranged on the mounting head 51, one mounting bolt 53 is arranged in one lock hole 512, and the threaded section 531 of the mounting bolt 53 is threadedly connected with the flange plate 2. In specific implementation, the mounting bolt 53 is integrally provided with a protruding limiting portion 532, the limiting portion 532 abuts against the mounting head 51 after the threaded section 531 is connected with the flange plate 2, and the mounting head 51 is coaxially connected with the flange plate 2 through the mounting bolt 53.

[0039] More specifically, as Figure 1 and 2As shown, the outer diameter of the mounting head 51 is the same as the inner diameter of the groove 4, and the mounting head 51 is in the shape of a circular truncated cone, and the end of the mounting head 51 with a small diameter is connected with the guide rod 52. After the guide seat 5 is coaxially connected with the flange plate 2, the oil seal 1 to be installed can be first passed through the guide rod 52 and then sleeved on the mounting head 51. The mounting head 51 is in the shape of a circular truncated cone, and the end close to the guide rod 52 is thin, which helps the oil seal 1 to be sleeved on the mounting head 51. When the oil seal 1 moves on the mounting head 51 to the end of the flange plate 2, the end of the mounting head 51 has the same diameter as the end of the flange plate 2, and then the oil seal 1 is coaxial with the flange plate 2 and the groove 4 when it is separated from the mounting head 51 and enters the groove 4, and then only needs to be continuously pushed to make the oil seal 1 enter the groove 4.

[0040] As shown in Figure 1 and 4 , the pressure seat 6 includes a pressure ring 61 and a guide ring 62 coaxially connected, the guide ring 62 is slidably sleeved on the guide rod 52, the pressure ring 61 is slidably sleeved on the mounting head 51, the end of the guide ring 62 away from the pressure ring 61 is coaxially provided with a through hole 621, and the threaded part of the press-fit bolt 7 passes through the through hole 621 and is threadedly connected with the guide rod 52; the end of the press-fit bolt 7 away from the guide rod 52 is provided with a second hexagonal head 71, which facilitates adjustment of the press-fit bolt 7 with a corresponding hexagonal wrench.

[0041] The press-fit bolt 7 is integrally provided with a driving cap 72, the end of the driving cap 72 close to the guide ring 62 is provided with a convex ring 73, the cross section of the convex ring 73 is in the shape of a semicircle, and the diameter of the convex ring 73 is greater than the diameter of the through hole 621. It also includes a washer 74, which is sleeved on the press-fit bolt 7, and the washer 74 is located between the convex ring 73 and the guide ring 62.

[0042] Specifically, as shown in Figure 1 , 2 and 4, after the oil seal 1 is sleeved on the mounting head 51, the pressure seat 6 is sleeved on the guide seat 5, and the washer 74 and the press-fit bolt 7 are installed; then the press-fit bolt 7 is adjusted to rotate by the wrench, and then the press-fit bolt 7 moves to the side of the guide rod 52, while driving the driving cap 72 to move to the side of the guide rod 52. The driving cap 72 can reduce the frictional resistance between the convex ring 73 and the washer 74, and then the driving cap 72 drives the guide ring 62 to move to the side of the flange plate 2 through the convex ring 73 and the washer 74 while rotating and moving, and then the oil seal 1 is pushed.

[0043] More specifically, as shown in Figure 1 and 2As shown, the pressing ring 61 is coaxially provided with a pushing ring 63 at one end away from the guide ring 62, the pushing ring 63 is in clearance fit with the mounting head 51, the ring width of the pushing ring 63 is greater than the groove width of the groove 4, which can prevent the pushing ring 63 from pushing too much; further, in the process of moving the pressing seat 6 on the guide seat 5 to the side of the flange plate 2, the oil seal 1 is gradually pushed into the groove 4 by the pushing ring 63 until the pushing ring 63 abuts against the engine housing 3, after keeping for 5 seconds, the pressing bolt 7, the pressing seat 6 and the guide seat 5 can be removed, through the above-mentioned manner, the oil seal 1 can be quickly aligned with the groove 4, the oil seal 1 is not easy to be damaged and the overall installation efficiency is higher.

[0044] More specifically, as shown in the drawings, Figures 1-3 The end of the mounting head 51 is coaxially provided with a butt joint groove 511, and the end of the flange plate 2 is integrally provided with a protruding circular table 21, the circular table 21 is in clearance fit with the butt joint groove 511, and further, when the guide seat 5 is installed, the groove 4 can be first sleeved on the circular table 21, the groove opening of the groove 4 can be chamfered, which facilitates the quick butt joint of the two, after the circular table 21 is inserted into the groove 4, the guide seat 5 is preliminarily coaxial with the flange plate 2, and then only the mounting bolt 53 needs to be installed in place to connect the mounting head 51 and the flange plate 2.

[0045] The mounting bolt 53 further includes an extension column 533, the extension column 533 is coaxially provided at one end of the limiting portion 532 away from the threaded section 531, and the extension column 533 is slidably provided out of the pressing ring 61; a first hexagonal head 534 is arranged at one end of the extension column 533 away from the limiting portion 532, which can be driven by a corresponding hexagonal wrench.

[0046] In specific implementation, as shown in the drawings, Figures 1-3 The extension column 533 is provided out of the pressing ring 61, which can prevent the pressing ring 61 from rotating when the pressing bolt 7 drives the pressing seat 6 to push the oil seal 1 on the guide seat 5, the pressing ring 61 will not rotate and will not produce rotating friction with the oil seal 1, thereby avoiding damaging the oil seal 1, and further, the extension column 533 can also guide part of the pressing ring 61, and the guide ring 62 and the guide rod 52 are cooperatively guided, so that the pressing seat 6 does not deviate along the axis of the flange plate 2 when pushing the oil seal 1, thereby ensuring the translation of the oil seal 1 and preventing the oil seal 1 from being damaged, and further ensuring the flatness and perpendicularity of the oil seal 1 after being installed in place.

[0047] At the same time, after the oil seal 1 is installed, the tooling can be directly removed when it is not used temporarily, which can quickly separate the tooling from the flange plate 2, thereby realizing quick disassembly without first removing the pressing seat 6 and then removing the guide seat 5, the mounting bolt 53 is not easy to fall off, which is convenient for transfer and storage, meets more use conditions, and greatly improves the work efficiency, and when it is needed in the subsequent use, only the pressing ring 61 needs to be removed.

[0048] As another embodiment, as shown in the drawings,Figure 1 and 2 As shown, it also includes a guide ring 8, which is slidably arranged in the inner cavity of the pressure ring 61, and the inner diameter of the guide ring 8 is not less than the outer diameter of the flange disk 2;

[0049] A plurality of long sliding holes 611 are provided in a circular array on the side wall of the pressure ring 61, and the long sliding holes 611 are parallel to the axis of the pressure ring 61. A plurality of sliders 81 are provided in a circular array on the guide ring 8. A driving ring 82 is provided on the outer side of the pressure ring 61, and a plurality of sliders 81 extend out of the plurality of long sliding holes 611 and are connected to the driving ring 82.

[0050] When implementing it specifically, Figure 1 and 2 As shown, the oil seal 1 has some slight deformation, which causes the inner lip 11 or the outer lip 12 to be unable to enter the groove 4 smoothly when the oil seal 1 is pushed into the groove 4. At this time, you can use your hand or a relatively blunt tool to move along the outer circumference of the oil seal 1 to push the outer lip 12 into the groove 4, while the inner lip 11 is directly moved toward the side of the flange plate 2 by driving the driving ring 82, so that the guide ring 8 inside the pressure ring 61 moves along the inner cavity of the pressure ring 61, first abutting against the dust lip 13 of the oil seal 1, forcing the inner lip 11 to move into the groove 4. If it still does not work, continue to drive the guide ring 8 to move. After passing through the dust lip 13, the guide ring 8 contacts the side wall of the inner lip 11, forcing the inner lip 11 into the groove 4, thereby ensuring that the inner lip 11 and the outer lip 12 of the oil seal 1 can both enter the groove 4 smoothly, providing the first condition for the subsequent flat pushing of the oil seal 1, and will not damage the oil seal 1.

[0051] like Figure 1 and 2 As shown, due to some processing or installation errors, it is sometimes difficult to keep the guide seat 5 and the flange plate 2 coaxial after installation. At this time, the oil seal 1 can be pushed flat first, and the guide ring 8 can be driven to move into the groove 4. If the guide ring 8 cannot enter the groove 4 smoothly, it means that there is a processing or installation error, and the staff will check and adjust it, which will provide a basis for judgment on whether to continue to install the oil seal 1 or determine that the flange plate 2 is unqualified.

[0052] More specifically, Figure 1 and 2 As shown, a spring 83 is also included. The spring 83 is sleeved on the pressure ring 61, and the two ends of the spring 83 respectively abut against the drive ring 82 and the push ring 63. The spring 83 can keep the guide ring 8 in the pressure ring 61 when not in use, and can also be used to reset the guide ring 8 after use, making it easier to use the guide ring 8.

[0053] At the same time, if Figure 1 and 2As shown, the guiding ring 8 is provided with a tapered ring 84 near one end of the flange disc 2, and the end of the tapered ring 84 is provided in a circular arc shape, so that the guiding ring 8 can smoothly pass through the dustproof lip 13 of the oil seal 1 when being pushed horizontally, and damage to the dustproof lip 13 and the inner lip 11 is avoided.

[0054] The preferred embodiments of the present application have been described above by way of example only, not for limitation, and various changes and modifications can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A crankshaft rear oil seal assembly tool for pushing an oil seal (1) into an annular groove (4) between a flange plate (2) and an engine housing (3); comprising a guide seat (5), a pressing seat (6) and a pressing bolt (7), the guide seat (5) comprising a mounting head (51) and a guide rod (52) coaxially connected, the mounting head (51) being coaxially connected with the flange plate (2) at an end away from the guide rod (52), the outer diameter of the mounting head (51) being the same as the inner diameter of the groove (4); the pressing seat (6) comprising a pressing ring (61) and a guide ring (62) coaxially connected, the guide ring (62) being slidably sleeved on the guide rod (52), the pressing ring (61) being slidably sleeved on the mounting head (51), the guide ring (62) being coaxially provided with a through hole (621) at an end away from the pressing ring (61), the threaded portion of the pressing bolt (7) passing through the through hole (621) and being threadedly connected with the guide rod (52); the pressing ring (61) being coaxially provided with a pushing ring (63) at an end away from the guide ring (62), the pushing ring (63) being clearance-fitted with the mounting head (51), the ring width of the pushing ring (63) being greater than the groove width of the groove (4); the end of the mounting head (51) being coaxially provided with a butt joint groove (511), the end of the flange plate (2) being integrally provided with a convex circular truncated cone (21), the circular truncated cone (21) being clearance-fitted with the butt joint groove (511). characterized in that Further comprising a guide ring (8) slidably arranged in the inner cavity of the pressing ring (61), the inner diameter of the guide ring (8) being not less than the outer diameter of the flange plate (2); a plurality of long sliding holes (611) being annularly arranged on the side wall of the pressing ring (61), the long sliding holes (611) being parallel to the axis of the pressing ring (61), a plurality of sliding blocks (81) being annularly arranged on the guide ring (8), a driving ring (82) being sleeved on the outside of the pressing ring (61), the plurality of sliding blocks (81) being respectively extended out of the plurality of long sliding holes (611) and connected with the driving ring (82). Further comprising a spring (83) sleeved on the pressing ring (61), the two ends of the spring (83) being respectively abutted with the driving ring (82) and the pushing ring (63). The end of the guide ring (8) close to the flange plate (2) is provided with a tapered ring (84), the end of the tapered ring (84) is provided in a circular arc shape. The mounting head (51) is in the shape of a circular truncated cone, the end with a smaller diameter of the mounting head (51) is connected with the guide rod (52).

2. The assembly tool for a crankshaft rear oil seal according to claim 1, wherein A plurality of lock holes (512) are annularly arranged on the mounting head (51), an installation bolt (53) is arranged in one of the lock holes (512), the threaded section (531) of the installation bolt (53) is threadedly connected with the flange plate (2); A convex limiting portion (532) is integrally arranged on the installation bolt (53), when the threaded section (531) is connected with the flange plate (2), the limiting portion (532) is abutted with the mounting head (51).

3. The assembly tool for a crankshaft rear oil seal according to claim 2, wherein ​ 4. The assembly tool for a crankshaft rear oil seal according to claim 3, wherein ​ 5. The assembly tool for a crankshaft rear oil seal according to any one of claims 1 to 4, characterized in that, ​ 6. The crankshaft rear oil seal assembly tool of claim 5, wherein, ​ ​ 7. The crankshaft rear oil seal assembly tool of claim 6, wherein: The mounting bolt (53) further comprises an extension column (533) coaxially arranged at one end of the limiting portion (532) away from the threaded section (531), and the extension column (533) is slidably arranged through the compression ring (61); One end of the extension column (533) away from the limiting portion (532) is provided with a first hexagonal head (534).

8. The crankshaft rear oil seal assembly tool of claim 1, wherein: The press-fit bolt (7) is provided with a second hexagonal head (71) at one end away from the guide rod (52).

9. The crankshaft rear oil seal assembly tool of claim 8, wherein, The press-fit bolt (7) is integrally provided with a driving cap (72), one end of the driving cap (72) close to the guide ring (62) is provided with a convex ring (73), and the diameter of the convex ring (73) is greater than the diameter of the through hole (621).

10. The crankshaft rear oil seal assembly tool of claim 9, wherein, Further comprising a gasket (74), the gasket (74) is sleeved on the press-fit bolt (7), and the gasket (74) is located between the convex ring (73) and the guide ring (62).

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