Engine timing phase auxiliary device and assembling method

Abstract

The invention relates to the field of engine phase assembly, and provides an engine timing phase auxiliary device and an assembly method.The device comprises a limiting shell, one end of the limiting shell is open, and the edge of the open end of the limiting shell extends outwards to be provided with a first connecting flange; an annular limiting piece is arranged at the position, close to the interior of the rear edge, of the opening end of the limiting shell. A timing gear connected with the end of the transmission shaft is arranged at the rear end of the limiting shell in a suspended mode. A gear positioning correction structure is accommodated between the limiting shell and the annular limiting piece; the rear end of the gear positioning and correcting structure is in sliding fit with the annular limiting piece. Wherein the gear positioning correction structure is configured to linearly move in the limiting shell under the limiting of the annular limiting piece, and can be coupled with or decoupled from a timing gear behind the limiting shell. According to the gear phase assembling device, the gear phase assembling operation of the external accessories of the engine can be rapidly, efficiently and accurately completed under the condition that the flywheel assembly does not need to be disassembled.

Description

Technical Field

[0001] The present application relates to the field of engine phase assembly, and in particular to an engine timing phase assist device and an assembly method. Background Art

[0002] As engine technology continues to evolve towards leaner performance, an increasing number of external accessories (such as high-pressure oil pumps, air compressors, and camshaft drives) are requiring timing phase alignment, leading to increasingly complex engine maintenance procedures. Existing technology typically achieves timing phase alignment for external accessories by aligning the timing marks on adjacent drive gears. However, these accessories have strict timing positional requirements, but due to the compact engine layout and the presence of multiple components, their installation locations prevent direct visibility of the timing marks on adjacent drive gears. To ensure correct phase alignment after accessory removal and installation, the common practice is to simultaneously remove and install components that obstruct the drive gears, such as the flywheel and flywheel housing, to ensure visibility of the gear timing marks and ensure proper phase alignment. This not only complicates engine maintenance but also allows for grease leakage from the gear housing during removal and installation, potentially leading to a poor seal and subsequently negatively impacting overall engine performance. Furthermore, removing and installing components like the flywheel housing places higher demands on the technical expertise of on-site maintenance personnel, increasing maintenance costs and resulting in a poor user experience. Summary of the Invention

[0003] The purpose of this application is to provide an engine timing phase assist device and assembly method that can quickly, efficiently, and accurately complete the gear phase assembly operation of an engine external accessory without disassembling the flywheel assembly, simplifying the maintenance process, avoiding lubricant leakage and seal failure, and reducing the technical requirements and maintenance costs for maintenance personnel. The specific solution is as follows:

[0004] An engine timing phase assist device, comprising:

[0005] A limit housing, wherein one end of the limit housing is open, and a first connecting flange is provided outwardly from the edge of the open end of the limit housing; an annular limit member is provided inside the open end of the limit housing near the rear edge;

[0006] A guide hole for the transmission shaft to pass through is provided at the front center of the limit housing;

[0007] The rear end of the limit housing may be suspended to provide a timing gear connected to the end of the transmission shaft;

[0008] A gear positioning and correction structure is accommodated between the limiting housing and the annular limiting member; the rear end of the gear positioning and correction structure is slidably engaged with the annular limiting member;

[0009] The gear positioning and correction structure is configured to move linearly inside the limiting housing under the limitation of the annular limiting member, and can be coupled or decoupled with the timing gear behind the limiting housing.

[0010] Optionally, the gear positioning correction structure includes:

[0011] A compression spring, the compression spring being accommodated in the limiting housing;

[0012] A limiter, wherein the front end of the limiter contacts the compression spring and the rear end slides with the annular limiter; wherein the rear end of the limiter can pass through the annular limiter and can be coupled with the timing gear behind the limiter housing.

[0013] Optionally, the stopper comprises: an annular plate, wherein the rear end surface of the annular plate is a plane design, and the rear end surface of the annular plate can be fitted with the front end surface of the annular stopper;

[0014] The front end of the annular plate contacts the compression spring;

[0015] The rear end surface of the annular plate is evenly arranged with a plurality of limiting posts on the same circumference, and correspondingly, corresponding positions on the annular limiting member are provided with limiting grooves for sliding with the limiting posts;

[0016] An annular protrusion is provided on the edge of the center hole of the annular plate extending backward; the annular protrusion can slide within the center hole of the annular limiting member;

[0017] A plurality of gear limiting portions are arranged at the rear end of the annular protrusion; wherein, the plurality of gear limiting portions can be coupled with the timing gear.

[0018] Optionally, the rear end surface of the first connecting flange of the limiting housing is provided with at least one first timing mark, and correspondingly, the timing gear is provided with a first alignment mark that can be aligned with the first timing mark.

[0019] An external engine accessory, which can be equipped with the engine timing phase assist device;

[0020] The engine external accessories include: an external accessory body, a transmission shaft and a timing gear;

[0021] The front end of the transmission shaft is rotatably connected to the outer component body, and the rear end can be passed through the guide hole of the limiting shell and extends out of the rear end of the limiting shell to be detachably connected to the timing gear.

[0022] Optionally, at least one second timing mark is provided on the front side of the limiting shell, and correspondingly, a second alignment mark that can be aligned with the second timing mark is provided on the rear end of the external accessory body.

[0023] An engine rear end flywheel structure comprises at least one of the aforementioned engine external accessories; and further comprises: a flywheel housing;

[0024] The flywheel is housed in the rear chamber of the flywheel housing; the front end of the flywheel housing is concave to form a gear chamber; the front end opening of the gear chamber is closed and provided with a flywheel end cover;

[0025] The gear chamber is provided with a crankshaft timing gear connected to the flywheel and an intermediate idler gear meshing with the crankshaft timing gear;

[0026] The intermediate idler gear can be meshed and connected with the timing gears at the rear ends of the two engine external accessories;

[0027] The outer circumferential surface of the flywheel is provided with a group of timing eye-catching marks for indicating the timing position of the timing gear of the engine external accessories;

[0028] A timing confirmation window is provided on the side wall of the flywheel housing; wherein, the timing confirmation window can be matched with a set of timing eye-catching marks to determine the timing position of the flywheel.

[0029] Optionally, a set of the timing eye-catching marks includes: at least one eye-catching mark and a flywheel timing mark; wherein the eye-catching mark and the flywheel timing mark are spaced apart, and the distance between the two is ≤ 1 / 2 of the length of the timing confirmation window;

[0030] The outer surface of the timing confirmation window is provided with a third timing mark which can be aligned with the flywheel timing mark.

[0031] A method for assembling the timing phase of an engine external accessory is applied to the aforementioned engine rear end flywheel structure, and is characterized by comprising the following steps:

[0032] Step S1: determining the timing position of the flywheel;

[0033] Step S2: determining the installation position of the idler gear based on the timing position of the flywheel;

[0034] Step S3: Based on the installation position of the intermediate idler gear, marking an engine external accessory assembly indicator corresponding to the installation position of the intermediate idler gear on the front end surface of the flywheel end cover;

[0035] Step S4: Based on the engine external accessory assembly indicator mark, a second alignment mark corresponding to the position of the engine external accessory assembly indicator mark is marked on the rear end of the external accessory body;

[0036] Step S5: Based on the second alignment mark at the rear end of the external accessory body, a second timing mark corresponding to the second alignment mark is marked at the front end of the limit housing;

[0037] Step S6: Based on the second timing mark marked on the front end of the limit housing, mark the first timing mark on the side surface of the first connecting flange;

[0038] Step S7: Based on the first timing mark of the first connecting flange, mark a first alignment mark corresponding to the first timing mark on the timing gear;

[0039] Step S8: Based on the first alignment mark on the timing gear, each engine external accessory is mounted on the flywheel structure at the rear end of the engine using a preset mounting method.

[0040] Optionally, step S8 includes:

[0041] Based on the first timing mark at the rear end of the first connecting flange, align the first alignment mark position of the timing gear at the rear end of the engine external accessory with the first timing mark position of the first connecting flange. At this time, the timing gear and the gear positioning correction structure are in a coupled state.

[0042] Based on the coupling state of the timing gear and the gear positioning correction structure, the timing gear is locked and fixed to the rear end of the transmission shaft of the engine external accessory, so that the engine timing phase assist device is fixed to the rear end of the transmission shaft of the engine external accessory;

[0043] Move the engine external accessory to the installation position of the flywheel end cover, and align the engine external accessory assembly indication mark on the flywheel end cover with the second comparison mark at the rear end of the external accessory body. At this time, under the external force, several limit columns at the rear end of the gear positioning and correction structure abut against the end face of the flywheel end cover or the assembly flange end face at the front end of the flywheel end cover, and push the gear positioning and correction structure forward to squeeze the compression spring, so that the coupling state of the timing gear and the gear positioning and correction structure is adjusted to the decoupling state, so as to complete the installation and fixation of the engine external accessory and the flywheel end cover.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention provides an engine timing phase assist device and assembly method. Through a special engine timing phase assist device, the timing marks of the engine's external accessory gears can be quickly aligned without disassembling or assembling shielding components such as the flywheel and flywheel housing, which greatly shortens the assembly time and significantly improves assembly efficiency. At the same time, since frequent disassembly and assembly of the gear chamber is avoided, the leakage of lubricating grease is avoided, the risk of gear wear is effectively reduced, the engine's sealing is guaranteed, and the overall service life is extended. Furthermore, a standardized marking process is innovatively introduced into the assembly method. Through a preset scale reference system and a rapid positioning benchmark, the flywheel structure identification and marking work is simplified. Even ordinary maintenance personnel can quickly master it. Compared with traditional methods, the technical threshold has been significantly lowered, and the maintenance cost is reduced. The device and method are highly versatile and can be adapted to a variety of engine models. They completely solve the problems of complex traditional assembly processes and low reliability, and bring users a new application experience with high efficiency, low cost, and low risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the overall structure of the engine timing phase assist device when it is coupled with the timing gear of the engine external accessories;

[0047] Figure 2 for Figure 1 PP cross-section diagram;

[0048] Figure 3 It is a schematic diagram of the overall structure of the engine timing phase assist device in a decoupled state from the timing gear of the engine external accessories;

[0049] Figure 4 for Figure 3 NN profile diagram;

[0050] Figure 5 It is a perspective view of the engine timing phase assist device;

[0051] Figure 6 for Figure 5 The enlarged schematic diagram of R in FIG.

[0052] Figure 7 This is a schematic diagram of the flywheel structure at the rear end of the engine being installed on the cylinder block;

[0053] Figure 8 for Figure 7 The enlarged structural diagram at M in FIG.

[0054] Figure 9 This is a schematic diagram of the exploded structure of the flywheel structure at the rear end of the engine when the engine timing phase assist device is not installed.

[0055] In the picture:

[0056] 1. Limit housing; 11. Second timing mark; 2. First connecting flange; 21. First timing mark; 3. Annular limiter; 31. Limit groove; 4. Guide hole;

[0057] 5. Gear positioning correction structure; 51. Compression spring;

[0058] 52. Stopper; 520. Annular plate; 521. Stopper column; 522. Annular protrusion; 523. Gear stopper;

[0059] 6. External accessory body; 7. Drive shaft; 8. Timing gear; 81. First alignment mark;

[0060] 1A, flywheel housing; 1B, flywheel end cover; 1C, crankshaft timing gear; 1D, intermediate idler gear; 1E, flywheel; 1G, timing confirmation window; 1H, eye-catching mark; 1J, flywheel timing mark. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of this application clearer, the following Figure 1-9 This application is further described in detail. Obviously, the embodiments described are only a part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in the examples of this application and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0063] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0064] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0065] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0066] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0067] It should be noted in particular that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0068] like Figure 1 As shown, an engine timing phase assist device includes:

[0069] A limiting housing 1, one end of which is open, and a first connecting flange 2 is provided extending outward from the edge of the open end of the limiting housing 1; an annular limiting member 3 is welded and fixed inside the open end of the limiting housing 1 near the edge;

[0070] The front center of the limiting housing 1 is provided with a guide hole 4 for the transmission shaft 7 to pass through;

[0071] The rear end of the limit housing 1 may be suspended with a timing gear connected to the end of the transmission shaft 7;

[0072] A gear positioning correction structure 5 is accommodated between the limiting housing 1 and the annular limiting member 3; the gear positioning correction structure 5 is slidably engaged with the annular limiting member 3 at one end thereof close to the timing gear;

[0073] The gear positioning correction structure 5 is configured to move linearly inside the limiting housing 1 under the limitation of the annular limiting member 3 , and can be coupled or decoupled with the timing gear 8 at the rear of the limiting housing 1 .

[0074] Specifically, the engine timing phase assist device provided in the present application can accurately install the timing gear 8 at the rear end of the external accessory in the gear chamber when installing the external accessory of the engine without removing the flywheel assembly, thereby ensuring the precise alignment of the gear phase of the external accessory of the engine, simplifying the operation process, and avoiding the problems of lubricating grease leakage and sealing failure.

[0075] The engine timing phase assist device provided in this application, as an auxiliary device for engine external accessories, optimizes the assembly process and has high repeatability and versatility.

[0076] Furthermore, the gear positioning correction structure 5 includes:

[0077] A compression spring 51 is housed in the limiting housing 1;

[0078] The limiter 52 has a front end in contact with the compression spring 51 and a rear end in sliding cooperation with the annular limiter 3 ; wherein the rear end of the limiter 52 can pass through the annular limiter 3 and be coupled with the timing gear 8 above the limit housing 1 .

[0079] Specifically, in the initial state, under the action of the compression spring 51, the limiter 52 pushes the rear end of the limiter 52 out of the annular limiter 3, and couples and limits the position of the limiter with the timing gear 8 at the position where the limiter extends out of the annular limiter 3, and in the coupled state, the common length of the coupling portion of the limiter 52 and the timing gear 8 is 1 / 2-2 / 3 of the axial length of the timing gear 8; for example, in the coupled state, the common length of the coupling portion of the limiter 52 and the timing gear 8 is 1 / 2 of the axial length of the timing gear 8; the advantage of this design is that, when in the coupled state, the limiter 52 and the timing gear 8 limit the free rotation of the timing gear 8 by means of a card connection, thereby facilitating the phase alignment of the timing gear and the gear inside the gear chamber, and avoiding interference between the timing gear and the gear inside the gear chamber during installation, resulting in a position offset of the timing gear and causing phase installation. Inaccurate; a further benefit is that, since in the coupled state, the common length of the limiter 52 and the timing gear coupling portion is 1 / 2 of the axial length of the timing gear, at this time, the meshing portion of the timing gear has an axial spare portion, and during the assembly process, it is ensured that the timing gear and the gear in the gear chamber are initially aligned in the coupled state, and it is also indirectly ensured that the front end installation position of the engine external accessory corresponds to the flywheel housing 1A. Furthermore, the bolts are continuously tightened until the corresponding end faces of the engine external accessory and the flywheel housing 1A are completely fitted and fixed. At this time, during the bolt locking process, the rear end of the limiter 52 is pushed toward the front end under the action of the end face of the flywheel end cover 1B, and the compression spring 51 is squeezed, so that the rear end of the limiter 52 and the timing gear are changed from a coupled state to a decoupled state, and the timing gear installation alignment of the engine external accessory is completed.

[0080] It can be understood that the design advantages of the gear positioning correction structure 5 are as follows: First, before installation, the rotational freedom of the timing gear of the engine external accessory is restricted and is in a coupled state; Second, during assembly, the initial alignment of the timing gear with the teeth inside the gear chamber and the initial alignment of the engine external accessory with the front installation position of the flywheel housing 1A can be simultaneously satisfied, and during the initial alignment, the contact part between the rear end of the limiter and the timing gear will not interfere with the alignment operation of the timing gear with the teeth inside the gear chamber.

[0081] Furthermore, the stopper includes: an annular plate 520, wherein the rear end surface of the annular plate 520 is a flat design, and the rear end surface of the annular plate 520 can be fitted with the front end surface of the annular stopper 3;

[0082] The lower surface of the annular plate 520 contacts the compression spring 51;

[0083] The rear end surface of the annular plate 520 is evenly arranged with a plurality of limiting posts 521 on the same circumference. Correspondingly, a limiting groove 31 is provided at a corresponding position on the annular limiting member 3 to cooperate with the limiting posts 521 to slide.

[0084] An annular protrusion 522 is provided on the edge of the center hole of the annular plate 520 extending backward; the annular protrusion 522 can slide within the center hole of the annular limiting member 3;

[0085] A plurality of gear limiting portions 523 are arranged at the rear end of the annular protrusion 522 ; wherein, the plurality of gear limiting portions 523 can be coupled with the timing gear.

[0086] In this embodiment, four limiting columns 521 are arranged at the rear end of the annular plate 520 , and four gear limiting portions 523 are arranged at the rear end of the annular protrusion 522 .

[0087] It can be understood that in the initial state (such as the state where the engine external accessories are not assembled), under the action of the compression spring 51, the four gear limiting parts 523 at the rear end of the annular protrusion 522 of the annular plate 520 are inserted into the tooth gap of the timing gear to maintain the coupling state.

[0088] Furthermore, at least one first timing mark 21 is provided on the side surface of the first connecting flange 2 at the rear end of the limiting housing 1 , and correspondingly, a first alignment mark 81 that can be aligned with the first timing mark 21 is provided on the timing gear.

[0089] It can be understood that by aligning the first timing mark 21 on the first connecting flange 2 with the first alignment mark 81 on the timing gear, the timing installation position of the timing gear in the engine external accessory can be clearly determined, thereby ensuring the correctness of the timing phase.

[0090] This application provides an engine timing phase assist device for assisting in the timing installation and alignment of an engine external accessory and a gear chamber. In actual use, the operating process of this assist device is as follows: first, the timing gear at the rear end of the engine external accessory is removed using a tool. Then, the engine timing phase assist device of this application is completely inserted into the transmission shaft 7 at the rear end of the engine external accessory. Then, the first alignment mark 81 of the timing gear is aligned with the first timing mark 21 on the first connecting flange 2. Finally, the locking nut at the rear end of the transmission shaft 7 is tightened using a tool to secure the timing gear to the transmission shaft 7.

[0091] On the other hand, the present application provides an external engine accessory, which can be installed with the engine timing phase assist device;

[0092] The engine external accessories include: an external accessory body 6, a transmission shaft 7 and a timing gear;

[0093] The front end of the transmission shaft 7 is rotatably connected to the outer component body, and the rear end can be inserted into the guide hole 4 of the limit housing; wherein, the rear end of the transmission shaft 7 extends out of the limit housing 4 and is detachably connected to the timing gear.

[0094] Furthermore, at least one second timing mark 11 is provided on the front side of the limiting shell, and correspondingly, a second alignment mark that can be aligned with the second timing mark 11 is provided on the rear end of the external accessory body 6 .

[0095] It can be understood that by aligning the second timing mark 11 of the limiting housing 1 with the second timing mark 11 on the external accessory body 6, the engine timing phase assist device can be ensured.

[0096] It can be understood that by aligning the second timing mark 11 on the limit housing 1 with the second alignment mark on the external accessory body 6, the limit housing 1 and the external accessory body 6 achieve a precise relative position relationship during assembly, ensuring that they are installed in place, avoiding problems such as component interference and poor matching due to installation deviations, and ensuring the structural stability and reliability of the entire engine external accessory system. At the same time, the timing relationship between the external accessory body 6 and the limit housing 1 can be accurately calibrated, thereby ensuring the timing matching accuracy between the external accessory and other engine components, ensuring the normal operation of the engine, and avoiding problems such as power reduction, shaking, or even failure to start due to timing errors.

[0097] On the other hand, the present application also provides an engine rear end flywheel structure, comprising the two aforementioned engine external accessories; and further comprising: a flywheel housing 1A;

[0098] The flywheel 1E is housed in the rear chamber of the flywheel housing 1A; the front end of the flywheel housing 1A is concave to form a gear chamber; the front end opening of the gear chamber is sealed with a flywheel end cover 1B;

[0099] The gear chamber is provided with a crankshaft timing gear 1C connected to the flywheel and an intermediate idler gear 1D meshing with the crankshaft timing gear 1C;

[0100] The intermediate idler gear 1D can be meshed and connected with the timing gears at the rear ends of the two engine external accessories;

[0101] The outer circumferential surface of the flywheel is provided with a group of timing eye-catching marks for indicating the timing position of the timing gear of the engine external accessories;

[0102] A timing confirmation window 1G is provided on the side wall of the flywheel housing 1A; wherein, the timing confirmation window 1G can be matched with a set of timing eye-catching marks to determine the timing position of the flywheel.

[0103] Furthermore, the set of timing eye-catching marks includes: at least one eye-catching mark 1H and a flywheel timing mark 1J; wherein the eye-catching mark 1H and the flywheel timing mark 1J are spaced apart, and the distance between the two is ≤ 1 / 2 of the length of the timing confirmation window 1G;

[0104] The outer surface of the timing confirmation window 1G is provided with a third timing mark which can be aligned with the flywheel timing mark 1J.

[0105] It can be understood that by aligning the third timing mark provided on the outer surface of the timing confirmation window 1G with the flywheel timing mark on the flywheel, accurate confirmation of the flywheel timing position is achieved. The eye-catching mark and the spacing between the eye-catching mark and the flywheel timing mark allow the user to quickly confirm the timing position of the flywheel.

[0106] In this embodiment, the engine external accessory may be an air compressor or a high-pressure oil pump.

[0107] On the other hand, the present application provides a method for assembling an engine external accessory timing phase, which is applied to the aforementioned engine rear end flywheel structure, comprising the following steps:

[0108] Step S1: determining the timing position of the flywheel;

[0109] Step S2: determining the installation position of the idler gear based on the timing position of the flywheel;

[0110] Step S3: Based on the installation position of the intermediate idler gear, an engine external accessory assembly indicator corresponding to the installation position of the intermediate idler gear is marked on the front end surface of the flywheel end cover 1B;

[0111] Step S4: Based on the engine external accessory assembly indicator mark, a second alignment mark corresponding to the position of the engine external accessory assembly indicator mark is marked on the rear end of the external accessory body;

[0112] Step S5: Based on the second alignment mark at the rear end of the external accessory body, a second timing mark 11 corresponding to the second alignment mark is marked at the front end of the limit housing 1;

[0113] Step S6: Based on the second timing mark 11 marked on the front end of the limiting housing 1, a first timing mark 21 is marked on the side surface of the first connecting flange 2;

[0114] Step S7: Based on the first timing mark 21 of the first connecting flange 2, mark a first alignment mark 81 corresponding to the first timing mark 21 on the timing gear;

[0115] Step S8: Based on the first alignment mark on the timing gear, each engine external accessory is mounted on the flywheel structure at the rear end of the engine using a preset mounting method.

[0116] Specifically, in S1: crank the flywheel and determine the timing position of the flywheel through the timing confirmation window on the flywheel housing.

[0117] In step S2, since the flywheel is ultimately connected to the intermediate idler gear through the crankshaft timing gear 1C, the installation position of the intermediate idler gear is determined based on the timing position of the flywheel.

[0118] In step S3, based on the installation position of the intermediate idler gear, an engine external accessory assembly indication mark corresponding to the installation position of the intermediate idler gear is marked on the front end surface of the flywheel end cover 1B;

[0119] In step S4, based on the engine external accessory assembly indicator mark, a second alignment mark corresponding to the position of the engine external accessory assembly indicator mark is marked on the rear end of the external accessory body;

[0120] The timing installation position of the engine external component is determined by aligning the second alignment mark on the external component body with the engine external component assembly indication mark on the front end of the flywheel end cover;

[0121] Using the second alignment mark of the external accessory body in step S5, a second timing mark corresponding to the position of the second alignment mark is marked on the front end of the limit housing to determine the installation position of the engine timing phase assist device;

[0122] Through the second timing mark marked on the front end of the limit shell in step S6, the first timing mark is marked on the side position of the first connecting flange 2 to assist in completing the installation of the components, and the first connecting flange 2 and the limit shell 1 are quickly and accurately installed to the correct position to ensure the relative position accuracy between the two, reduce installation errors, and improve assembly efficiency and quality.

[0123] Through the first timing mark at the rear end of the first connecting flange 2 in step S7 , a first alignment mark corresponding to the position of the first timing mark is marked on the timing gear to ensure that the timing position of the timing gear is accurately installed.

[0124] It can be understood that in actual application, the first alignment mark on the timing gear of the engine external accessory can be pre-marked in the assembly workshop or marked on site by scribing.

[0125] Furthermore, through step S8, based on the first alignment mark on the timing gear, a preset assembly method is adopted to complete the installation and fixation of the engine external accessories.

[0126] It can be understood that this application uses a special engine timing phase assist device to quickly align the timing marks of the engine's external accessory gears without disassembling the flywheel, flywheel housing and other obstructing parts, which greatly shortens the assembly time and significantly improves the assembly efficiency. Secondly, the innovative introduction of a standardized marking process in the assembly method simplifies the flywheel structure identification and marking work through a preset scale reference system and a rapid positioning benchmark. Even ordinary maintenance personnel can quickly master it, and the technical threshold has been significantly lowered compared to traditional methods, and the maintenance cost has been reduced. At the same time, it avoids frequent disassembly and assembly of the gear chamber, avoids the leakage of lubricating grease, effectively reduces the risk of gear wear, ensures the sealing of the engine, and extends the overall service life.

[0127] Furthermore, the step S8 specifically includes:

[0128] Based on the first timing mark at the rear end of the first connecting flange 2, align the first alignment mark position of the timing gear at the rear end of the engine external accessory with the first timing mark position of the first connecting flange 2. At this time, the timing gear and the gear positioning correction structure 5 are in a coupled state;

[0129] Based on the coupling state of the timing gear and the gear positioning correction structure 5, the timing gear is locked and fixed to the rear end of the transmission shaft 7 of the engine external accessory, so that the engine timing phase assist device is fixed to the rear end of the transmission shaft 7 of the engine external accessory;

[0130] Move the engine external accessory to the installation position of the flywheel end cover, and align the engine external accessory assembly indication mark on the flywheel end cover with the second comparison mark at the rear end of the external accessory body. At this time, under the external force, several limiting columns 521 at the rear end of the gear positioning and correction structure 5 abut against the end face of the flywheel end cover 1B or the assembly flange end face at the front end of the flywheel end cover, and push the gear positioning and correction structure 5 forward to squeeze the compression spring 51, so that the coupling state of the timing gear and the gear positioning and correction structure 5 is adjusted to the decoupling state, so as to complete the installation and fixation of the engine external accessory and the flywheel end cover.

[0131] Specifically, the engine external accessory is moved to the installation position of the flywheel end cover, and the engine external accessory assembly indication mark on the flywheel end cover is aligned with the second comparison mark at the rear end of the external accessory body. At this time, the timing gear on the engine external accessory is preliminarily engaged with the intermediate idler gear in the gear chamber. Then, by tightening the bolts on the first connecting flange 2, the engine timing phase assist device is pushed as a whole toward the flywheel end cover. During the pushing process, the front end face of the flywheel end cover or the assembly flange end face at the front end of the flywheel end cover abuts against several limit columns 521 at the rear end of the gear positioning and correction structure 5, and pushes the limiter to squeeze the compression spring 51 until the front end face of the flywheel end cover or the assembly flange end face at the front end of the flywheel end cover is completely fitted with the rear end face of the annular limit member 3. The coupling state of the timing gear and the gear positioning and correction structure 5 is adjusted to a decoupling state. At this time, the engine external accessory and the flywheel end cover are installed and fixed under the action of the bolts.

[0132] It can be understood that the advantages of the present application by adopting the preset equipment method are as follows:

[0133] 1. When the engine timing phase assist device is assembled on the engine external accessory, the timing gear and the engine external accessory are installed in a timed and positioned manner, and the timing gear and the limiter cooperate to facilitate the locking and fixing of the timing gear;

[0134] 2. The timing phase assist device is used to limit the freedom of the timing gear in the engine external accessories, and in this coupling state, the engine external accessories and the gear chamber are preliminarily installed while ensuring the timing position installation accuracy of the engine external accessories.

[0135] 3. By tightening the bolts, the coupling state of the timing gear and the gear positioning correction structure 5 is gradually adjusted to a decoupling state, and the installation process is controlled to prevent the timing gear from interfering with the gears in the gear chamber, causing the timing gear to rotate freely and causing deviations in the timing position of the external accessories.

[0136] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An engine timing phase assist device, characterized in that: include: A limiting shell (1), wherein one end of the limiting shell (1) is open, and a first connecting flange (2) is provided extending outward from the edge of the open end of the limiting shell (1); an annular limiting member (3) is fixedly provided inside the open end of the limiting shell (1) near the rear edge; A guide hole (4) for the transmission shaft (7) to pass through is provided at the front center of the limiting housing (1); A timing gear (8) connected to the end of a transmission shaft (7) may be suspended at the rear end of the limiting housing (1); A gear positioning correction structure (5) is accommodated between the limiting housing (1) and the annular limiting member (3); an end of the gear positioning correction structure (5) close to the timing gear (8) is in sliding engagement with the annular limiting member (3); The gear positioning correction structure (5) is configured to move linearly inside the limiting housing (1) under the limitation of the annular limiting member (3), and can be coupled or decoupled with the timing gear (8) at the rear of the limiting housing (1).

2. The engine timing phase assist device according to claim 1, characterized in that: The gear positioning correction structure (5) comprises: A compression spring (51), the compression spring (51) being accommodated inside the limiting housing (1); A limiter (52) is provided, wherein the front end of the limiter (52) contacts the compression spring (51) and the rear end is slidably matched with the annular limiter (3); wherein the rear end of the limiter (52) can pass through the annular limiter (3) and be coupled with the timing gear (8) at the rear of the limiter housing (1).

3. The engine timing phase assist device according to claim 2, characterized in that: The stopper (52) comprises: an annular plate (520), wherein the rear end surface of the annular plate (520) is a plane design, and the rear end surface of the annular plate (520) can be fitted with the front end surface of the annular stopper (3); The front end of the annular plate (520) contacts the compression spring (51); A plurality of limiting posts (521) are evenly arranged on the same circumference of the rear end surface of the annular plate (520); correspondingly, limiting grooves (31) for sliding with the limiting posts (521) are provided at corresponding positions on the annular limiting member (3); An annular protrusion (522) is provided on the edge of the center hole of the annular plate (520) extending backward; the annular protrusion (522) can slide within the center hole of the annular limiting member (3); A plurality of gear limiting portions (523) are arranged at the rear end of the annular protrusion (522); wherein the plurality of gear limiting portions (523) can be coupled with the timing gear (8).

4. The engine timing phase assist device according to any one of claims 1 to 3, characterized in that: At least one first timing mark (21) is provided on the side surface of the first connecting flange (2) at the rear end of the limiting housing (1); correspondingly, a first alignment mark (81) that can be aligned with the first timing mark (21) is provided on the timing gear (8).

5. An engine external accessory, characterized in that: The engine external accessory may be equipped with the engine timing phase assist device according to any one of claims 1 to 4; The engine external accessory comprises: an external accessory body (6), a transmission shaft (7) and a timing gear (8); The front end of the transmission shaft (7) is rotatably connected to the outer component body, and the rear end can be inserted into the guide hole (4) of the limiting housing (1); wherein the rear end of the transmission shaft (7) extends out of the limiting housing (1) and is detachably connected to the timing gear (8).

6. The engine external accessory according to claim 5, characterized in that: At least one second timing mark (11) is provided on the front side of the limiting housing (1), and correspondingly, a second alignment mark that can be aligned with the second timing mark (11) is provided on the rear end of the external attachment body (6).

7. A flywheel structure at the rear end of an engine, characterized in that: The invention comprises at least one engine external accessory according to claim 6; and further comprises: a flywheel housing (1A); The rear end chamber of the flywheel housing (1A) contains a flywheel (1E); the front end of the flywheel housing (1A) is concave to form a gear chamber; the front end opening of the gear chamber is sealed and provided with a flywheel end cover (1B); The gear chamber is provided with a crankshaft timing gear (1C) connected to a flywheel (1E), and an intermediate idler gear (1D) meshing with the crankshaft timing gear (1C); The intermediate idler gear (1D) can be meshed and connected with the timing gear (8) at the rear end of the engine external accessory; The outer circumferential surface of the flywheel (1E) is provided with a group of timing eye-catching markings for indicating the timing position of the timing gear (8) of the engine external accessories; A timing confirmation window (1G) is provided on the side wall of the flywheel housing (1A); wherein the timing confirmation window (1G) can be matched with a set of timing eye-catching marks to determine the timing position of the flywheel.

8. The engine rear end flywheel structure according to claim 7, characterized in that: A set of timing eye-catching marks includes: at least one eye-catching mark (1H) and a flywheel timing mark (1J); wherein the eye-catching mark (1H) and the flywheel timing mark (1J) are spaced apart, and the distance between the two is ≤ 1 / 2 of the length of the timing confirmation window (1G); The outer surface of the timing confirmation window (1G) is provided with a third timing mark which can be aligned with the flywheel timing mark (1J).

9. A method for assembling timing phase of an engine external accessory, applied to the engine rear end flywheel structure according to claim 7 or 8, characterized in that: The following steps are involved: Step S1: determining the timing position of the flywheel; Step S2: determining the installation position of the idler gear based on the timing position of the flywheel; Step S3: Based on the installation position of the intermediate idler gear, marking an engine external accessory assembly indication mark corresponding to the installation position of the intermediate idler gear on the front end surface of the flywheel end cover (1B); Step S4: Based on the engine external accessory assembly indicator mark, a second alignment mark corresponding to the position of the engine external accessory assembly indicator mark is marked on the rear end of the external accessory body; Step S5: Based on the second alignment mark at the rear end of the external accessory body, a second timing mark corresponding to the second alignment mark is marked at the front end of the limit housing; Step S6: Based on the second timing mark marked on the front end of the limit housing, mark the first timing mark on the side surface of the first connecting flange; Step S7: Based on the first timing mark of the first connecting flange, mark a first alignment mark corresponding to the first timing mark on the timing gear; Step S8: Based on the first alignment mark on the timing gear, each engine external accessory is mounted on the flywheel structure at the rear end of the engine using a preset mounting method.

10. The method according to claim 9, characterized in that The step S8 comprises: Based on the first timing mark at the rear end of the first connecting flange, align the first alignment mark position of the timing gear at the rear end of the engine external accessory with the first timing mark position of the first connecting flange. At this time, the timing gear and the gear positioning correction structure are in a coupled state. Based on the coupling state of the timing gear and the gear positioning correction structure, the timing gear is locked and fixed to the rear end of the transmission shaft of the engine external accessory, so that the engine timing phase assist device is fixed to the rear end of the transmission shaft of the engine external accessory; Move the engine external accessory to the installation position of the flywheel end cover, and align the engine external accessory assembly indication mark on the flywheel end cover with the second comparison mark at the rear end of the external accessory body. At this time, under the external force, several limit columns at the rear end of the gear positioning and correction structure abut against the end face of the flywheel end cover or the assembly flange end face at the front end of the flywheel end cover, and push the gear positioning and correction structure forward to squeeze the compression spring, so that the coupling state of the timing gear and the gear positioning and correction structure is adjusted to the decoupling state, so as to complete the installation and fixation of the engine external accessory and the flywheel end cover.

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