A timing chain installation device and method for a v-type engine

Abstract

The application discloses a timing chain assembling and adjusting device and method of a V-type engine and belongs to the technical field of passenger car engine research and development trial assembling and adjusting, and comprises a layered assembling module, a tensioning chain module and a tightening camshaft sprocket module.The layered assembling module is used for sequentially assembling an oil pump chain set, a left camshaft chain set and a right camshaft chain set and tightening an oil pump sprocket.The tensioning chain module is used for sequentially tensioning the left camshaft chain, the right camshaft chain and the oil pump chain.The tightening camshaft sprocket module is used for tightening a right-row camshaft sprocket, a right-in camshaft sprocket, a left-row camshaft sprocket and a left-in camshaft sprocket in a clockwise direction as a tightening sequence.The camshaft and the crankshaft are simultaneously operated, so that power transmission efficiency attenuation is reduced, valve timing lag is eliminated, engine valve timing precision, engine performance and quality are improved, the failure rate is reduced, maintainability and whole-machine reliability are improved, and the service life of the engine is prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of passenger car engine development and trial production adjustment, and particularly relates to a timing chain adjustment device and method for a V-type engine. BACKGROUND

[0002] The V-type twelve-cylinder engine is the first domestically developed high-end gasoline engine with in-cylinder direct injection and double turbocharging. Due to the application of multiple new technologies, the overall product design structure is complex, and in particular, the timing chain system is a key kinematic pair mechanism, and its performance directly affects the power, economy and reliability of the engine. The existing V-type twelve-cylinder engine chain system, such as the chain system involved in the invention patent application: an engine chain system and a vehicle (application number 202310710879.8), reduces friction loss by eliminating the intermediate idler, reduces phase deviation, improves timing accuracy, reduces overall fuel consumption and noise, avoids the reliability and use experience problems caused by the intermediate idler, and cooperates with the sprocket integrally arranged on the crankshaft, so that the sizes of the crankshaft, the intake camshaft and the exhaust camshaft can be reduced, thereby reducing the space required for installing the engine chain system, which is beneficial to optimizing the vehicle design and improving the overall product power. However, the two-stage chain drive structure of the above-mentioned chain system has a power transmission lag phenomenon, and the right camshaft lags more obviously than the left camshaft.

[0003] The existing timing chain adjustment method cannot solve the camshaft lag problem when applied to the two-stage chain structure of the above-mentioned chain system, which affects the initial accuracy of engine valve timing, and further causes the cylinder charging efficiency to be unable to adapt to the in-cylinder direct injection combustion mode. In addition, the existing adjustment method sets a timing groove at the rear end of the camshaft, which can cause the front and rear ends of the camshaft to be stressed simultaneously when the camshaft sprocket is fixed at the front end of the camshaft, resulting in bending deformation of the camshaft and affecting the timing accuracy. SUMMARY

[0004] The purpose of the present application is to provide a timing chain adjustment device and method for a V-type engine, which closely fits the chain with the camshaft and crankshaft, eliminates the gap between the tight side of the chain, ensures the synchronous operation of the crankshaft and camshaft in the clockwise direction, eliminates the lag phenomenon, improves the engine valve timing accuracy, thereby improving the engine performance and quality, reducing the failure rate, improving the maintainability, improving the overall reliability, and prolonging the service life of the engine.

[0005] The present application provides the following solutions:

[0006] In a first aspect, the present application discloses a timing chain adjustment device for a V-type engine, comprising:

[0007] The layered assembly module is used for sequentially assembling the oil pump chain set, the left camshaft chain set and the right camshaft chain set, and tightening the oil pump chain wheel.

[0008] The tensioning chain module is used for sequentially tensioning the left camshaft chain, the right camshaft chain and the oil pump chain.

[0009] The tightening camshaft sprocket module is used for tightening the right row camshaft sprocket, the right inlet camshaft sprocket, the left row camshaft sprocket and the left inlet camshaft sprocket in the clockwise direction as the tightening sequence.

[0010] Preferably, the layered assembly module is provided with an initial positioning module in advance.

[0011] The initial positioning module is used for rotating and adjusting the crankshaft, the right row camshaft, the right inlet camshaft, the left inlet camshaft and the left row camshaft to the initial position of the positive time and fixing them by using positioning tools.

[0012] Preferably, the initial positioning module comprises:

[0013] The fixed crankshaft module is used for setting the crankshaft timing slot on the crankshaft, rotating the crankshaft to make the crankshaft timing slot coaxial with the cylinder timing hole, installing the tail of the crankshaft timing pin in the crankshaft timing slot, fixing the middle part of the crankshaft timing pin with the cylinder, connecting the rear end of the crankshaft with the flywheel, installing the flywheel fixed clamping plate on the flywheel, and fixing the flywheel fixed clamping plate with the cylinder through the fastener.

[0014] The fixed camshaft module is used for setting the camshaft timing slot on the right row camshaft, the right inlet camshaft, the left inlet camshaft and the left row camshaft, and inserting the tail of the camshaft timing pin into the camshaft timing slot, and fixing the middle part of the camshaft timing pin with the camshaft cover.

[0015] Preferably, the camshaft timing slot is arranged at the front end of the right row camshaft, the right inlet camshaft, the left inlet camshaft and the left row camshaft.

[0016] Preferably, the flywheel fixed clamping plate is provided with a threaded hole and a fixed tooth, the fastener is screwed with the threaded hole and fixed with the cylinder, and the fixed tooth is clamped with the flywheel.

[0017] Preferably, the layered assembly module comprises:

[0018] The oil pump chain assembly module is used for connecting the oil pump chain with the oil pump drive sprocket, placing the oil pump bolt into the oil pump sprocket and tightening it, and installing the oil pump tensioner.

[0019] The left camshaft chain assembly module is used for connecting the left camshaft chain with the left crankshaft sprocket and sleeving the left camshaft chain on the left exhaust camshaft sprocket and the left intake camshaft sprocket, installing the left tensioner, placing the left exhaust camshaft sprocket bolt into the left exhaust camshaft sprocket without tightening, and placing the left intake camshaft sprocket bolt into the left intake camshaft sprocket without tightening.

[0020] The right camshaft chain assembly module is used for connecting the right camshaft chain with the right crankshaft sprocket and sleeving the right camshaft chain on the right exhaust camshaft sprocket and the right intake camshaft sprocket, installing the right tensioner, placing the right exhaust camshaft sprocket bolt into the right exhaust camshaft sprocket without tightening, and placing the right intake camshaft sprocket bolt into the right intake camshaft sprocket without tightening.

[0021] Preferably, the tensioning chain module sequentially tensions the left camshaft chain, the right camshaft chain and the oil pump chain by sequentially tensioning the left tensioner, the right tensioner and the oil pump tensioner.

[0022] Preferably, the tightening camshaft sprocket module comprises:

[0023] The determination of the tightening sequence module is used for observing the positions of the right exhaust camshaft, the right intake camshaft, the left intake camshaft and the left exhaust camshaft from the front end of the engine, and taking the clockwise direction as the tightening sequence.

[0024] The sequential tightening module is used for sequentially tightening the right exhaust camshaft sprocket bolt, the right intake camshaft sprocket bolt, the left intake camshaft sprocket bolt and the left exhaust camshaft sprocket bolt.

[0025] In a second aspect, the present application discloses a timing chain assembly and adjustment method of a V-type engine, which is completed by using the timing chain assembly and adjustment device of the V-type engine.

[0026] S2, layered assembly: sequentially assemble the oil pump chain set, the left camshaft chain set and the right camshaft chain set, and tighten the oil pump sprocket;

[0027] S3, tensioning the chain: sequentially tension the left camshaft chain, the right camshaft chain and the oil pump chain, and eliminate the fitting clearance;

[0028] S4, tighten the camshaft sprocket: tighten the right exhaust camshaft sprocket, the right intake camshaft sprocket, the left exhaust camshaft sprocket and the left intake camshaft sprocket, take the clockwise direction as the tightening sequence, and eliminate the valve timing retardation between the right exhaust camshaft, the right intake camshaft, the left intake camshaft, the left exhaust camshaft and the right exhaust camshaft sprocket, the right intake camshaft sprocket, the left intake camshaft sprocket and the left exhaust camshaft sprocket.

[0029] Preferably, before the S2 step, the following steps are further included:

[0030] S1, initial positioning: respectively rotate and adjust the crankshaft, the right row camshaft, the right inlet camshaft, the left inlet camshaft and the left row camshaft to the initial position of the timing and fix them.

[0031] Compared with the prior art, the present application has the following advantages:

[0032] 1. The present application first installs the chain groups in the order of "oil pump chain group - left camshaft chain group - right camshaft chain group", then respectively tensions the chains in the order of "left camshaft chain - right camshaft chain - oil pump chain", so that the chains are closely attached to the camshafts and the crankshaft, the tight side gap between the chains and the camshafts is eliminated, finally the camshaft bolts are tightened in the clockwise direction one by one, so that the camshaft sprocket is fixedly installed on the camshaft, the camshafts and the crankshaft are always synchronously operated, the power transmission efficiency decay and the valve timing lag are reduced, the engine valve timing precision, engine performance and quality are improved, the failure rate is reduced, the maintainability and the overall reliability are improved, the engine service life is prolonged, a new technical scheme and idea are provided for the development and trial production of new energy powertrain products, which is helpful for the technical innovation and development of the industry.

[0033] 2. The present application fixes the crankshaft at the initial position of the timing through the crankshaft timing pin and the flywheel fixing plate, and fixes the camshaft at the initial position of the timing through the camshaft timing pin, which has good positioning effect.

[0034] 3. The camshaft timing groove and the camshaft sprocket of the present application are both arranged at the front end of the camshaft, so that the stress of the camshaft is concentrated at the front end, avoiding the stress on the front and rear ends of the camshaft, which leads to the bending deformation of the middle part of the camshaft and affects the timing precision. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0036] Figure 1 A perspective view of the timing chain system of the V-type engine assembled and adjusted by the present application;

[0037] Figure 2 A front view of the timing chain system of the V-type engine assembled and adjusted by the present application;

[0038] Figure 3Structure diagram of the crankshaft of the timing chain system assembled by the timing chain assembling device of the present application;

[0039] Figure 4 Block diagram of the timing chain assembling device of the present application;

[0040] Figure 5 Block diagram of the initial positioning module of the timing chain assembling device of the present application;

[0041] Figure 6 Block diagram of the layered assembling module of the timing chain assembling device of the present application;

[0042] Figure 7 Block diagram of the camshaft sprocket tightening module of the timing chain assembling device of the present application;

[0043] Figure 8 Structure diagram of the crankshaft timing pin of the timing chain assembling device of the present application;

[0044] Figure 9 Structure diagram of the flywheel fixing clamping plate of the timing chain assembling device of the present application;

[0045] Figure 10 Structure diagram of the camshaft timing pin of the timing chain assembling device of the present application;

[0046] Figure 11 Flow chart of the timing chain assembling method of the present application.

[0047] In the drawings:

[0048] 1. crankshaft; 1-1. right crankshaft sprocket; 1-2. left crankshaft sprocket; 1-3. oil pump drive sprocket; 2. right exhaust camshaft; 3. right intake camshaft; 4. left intake camshaft; 5. left exhaust camshaft; 6. flywheel;

[0049] 7. crankshaft timing pin; 8. flywheel fixing clamping plate; 8-1. fixing tooth; 8-2. threaded hole; 9. camshaft timing pin;

[0050] Y1. right camshaft chain; Y2. right exhaust camshaft sprocket; Y3. right exhaust camshaft sprocket bolt; Y4. right movable rail; Y5. right upper guide rail; Y6. right intake camshaft sprocket; Y7. right intake camshaft sprocket bolt; Y8. right fixed rail; Y9. right tensioner;

[0051] Z1. left camshaft chain; Z2. left exhaust camshaft sprocket; Z3. left exhaust camshaft sprocket bolt; Z4. left movable rail; Z5. left upper guide rail; Z6. left intake camshaft sprocket; Z7. left intake camshaft sprocket bolt; Z8. left fixed rail; Z9. left tensioner;

[0052] X1. Oil pump chain; X2. Oil pump sprocket; X3. Oil pump bolt; X4. Oil pump tensioner;

[0053] 100. Initial positioning module; 101. Fixed crankshaft module; 102. Fixed camshaft module; 200. Layered assembly module; 201. Oil pump chain assembly module; 202. Left camshaft chain assembly module; 203. Right camshaft chain assembly module; 204. Oil pump sprocket fixing module; 300. Tensioning chain module; 400. Tightening camshaft sprocket module; 401. Oil pump sprocket fixing module; 402. Sequential tightening module. DETAILED DESCRIPTION

[0054] In order to make the purposes, technical solutions and advantages of the present application clearer, the following will further describe the present application with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0055] The terms used in the embodiments of the present application are merely for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0056] It should be understood that the term "and / or" used herein is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0057] It should be understood that although the terms first, second, third, etc. can be used in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the description. For example, without departing from the scope of the embodiments of the present application, the first can also be called the second, and similarly, the second can also be called the first.

[0058] Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)".

[0059] It is also important to note that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

[0060] In particular, it is expressly intended that the symbols and / or numbers in the description that could be marked in the drawings are not drawing references.

[0061] The application provides a timing chain adjusting device and method of a V-type engine, which is used for adjusting and assembling Figures 1-3 The timing chain system of the V-type engine shown in the figure comprises:

[0062] The crankshaft 1 is provided with a right crankshaft sprocket 1-1, a left crankshaft sprocket 1-2 and an oil pump driving sprocket 1-3 from front to back at the front end of the crankshaft 1.

[0063] The camshaft is provided with four camshafts, i.e., a right row camshaft 2, a right inlet camshaft 3, a left inlet camshaft 4 and a left row camshaft 5; correspondingly, the camshaft sprocket is provided with four camshaft sprockets, i.e., a right row camshaft sprocket Y2, a right inlet camshaft sprocket Y6, a left inlet camshaft sprocket Z6 and a left row camshaft sprocket Z2; correspondingly, the camshaft sprocket bolt is used for tightening the camshaft sprocket and is provided with four camshaft sprocket bolts, i.e., a right row camshaft sprocket bolt Y3, a right inlet camshaft sprocket bolt Y7, a left inlet camshaft sprocket bolt Z7 and a left row camshaft sprocket bolt Z3.

[0064] The oil pump is provided with an oil pump sprocket X2 which can be fixedly installed on the oil pump through an oil pump bolt X3.

[0065] The oil pump sprocket set comprises an oil pump sprocket X1 and an oil pump tensioner X4.

[0066] The left camshaft sprocket set comprises a left camshaft sprocket Z1, a left fixed rail Z8, a left upper guide rail Z5, a left movable rail Z4 and a left tensioner Z9; the left fixed rail Z8, the left upper guide rail Z5, the left movable rail Z4 and the left tensioner Z9 are used for guiding and tensioning the left camshaft sprocket Z1.

[0067] The right camshaft chain set includes a right camshaft chain Y1, a right fixed rail Y8, a right upper guide rail Y5, a right movable rail Y4 and a right tensioner Y9; the right fixed rail Y8, the right upper guide rail Y5, the right movable rail Y4 and the right tensioner Y9 are used for guiding and tensioning the right camshaft chain Y1.

[0068] Embodiment 1

[0069] Referring to Figures 1-4 As shown in the figure, the timing chain assembly device of the V-type engine provided by the embodiment of the application comprises: a layered assembly module 200, which is used for sequentially assembling an oil pump chain set, a left camshaft chain set and a right camshaft chain set, and tightening an oil pump chain wheel X2; a tensioning chain module 300, which is used for sequentially tensioning a left camshaft chain Z1, a right camshaft chain Y1 and an oil pump chain X1; and a camshaft chain wheel tightening module 400, which is used for tightening a right row camshaft chain wheel Y2, a right inlet camshaft chain wheel Y6, a left row camshaft chain wheel Z2 and a left inlet camshaft chain wheel Z6 in a clockwise direction as the tightening sequence.

[0070] First, the chain sets are installed in the order of "oil pump chain set-left camshaft chain set-right camshaft chain set", and then the chains are tensioned in the order of "left camshaft chain-right camshaft chain-oil pump chain", so that the chains are closely attached to the camshafts and the crankshaft, the gap between the chains and the camshafts and the crankshaft is eliminated, and finally the camshaft bolts are tightened one by one in the clockwise direction, so that the camshaft chain wheels are fixedly installed on the camshafts, the camshafts and the crankshaft are always synchronously operated, the power transmission efficiency decay is reduced, and the valve timing lag is eliminated, thereby improving the valve timing precision of the engine, the engine performance and quality, reducing the failure rate, improving the maintainability and the overall reliability, and prolonging the service life of the engine.

[0071] Referring to Figure 1 , 2 , 4, the layered assembly module 200 is provided with an initial positioning module 100 in advance:

[0072] The initial positioning module 100 is used for rotating and adjusting the crankshaft 1, the right row camshaft 2, the right inlet camshaft 3, the left inlet camshaft 4 and the left row camshaft 5 to the initial timing position by the positioning tool and fixing.

[0073] The crankshaft 1 and the camshafts are fixed, so that the assembly of the oil pump chain set, the left camshaft chain set and the right camshaft chain set can be completed.

[0074] Referring to Figure 1 , 3 , 5, 8, 9, 10, the initial positioning module 100 comprises:

[0075] The fixed crankshaft module 101 is used to set the crankshaft timing groove 1-4 on the crankshaft 1, and rotate the crankshaft 1 to make the crankshaft timing groove 1-4 coaxial with the cylinder block timing hole; the tail of the crankshaft timing pin 7 is installed in the crankshaft timing groove 1-4, and the middle part of the crankshaft timing pin 7 is fixedly connected to the cylinder block; the rear end of the crankshaft 1 is connected to the flywheel 6, the flywheel fixing plate 8 is installed on the flywheel 6, and the flywheel fixing plate 8 is fixedly connected to the cylinder block by fasteners;

[0076] The fixed camshaft module 102 is used to set camshaft timing grooves on the right-hand camshaft 2, right-in camshaft 3, left-in camshaft 4 and left-hand camshaft 5. The tail of the camshaft timing pin 9 is inserted into the camshaft timing groove, the middle of the camshaft timing pin 9 is fixedly connected to the camshaft cover, and the head of the camshaft timing pin 9 is provided with a nut that cooperates with a tightening tool.

[0077] The crankshaft timing pin 7 and flywheel retaining plate 8 are designed to fix the crankshaft 1 in the initial timing position. The crankshaft timing groove 1-4 is set in the middle of the crankshaft 1. The crankshaft timing groove 1-4 is rotated to a position coaxial with the timing hole of the cylinder block, so that the crankshaft 1 is in the initial timing position. Then, the crankshaft timing pin 7 is inserted into the crankshaft timing groove 1-4 to fix the middle part of the crankshaft 1 to the cylinder block, thus fixing the crankshaft 1 in the initial timing position. Since the flywheel 6 is installed at the rear end of the crankshaft 1, the flywheel retaining plate 8 fixes the flywheel 6, thereby fixing the rear end of the crankshaft 1. Fixing the middle and rear ends of the crankshaft 1 ensures that the crankshaft 1 will not shift when the chain assembly is installed at the front end of the crankshaft 1. The camshaft timing pin 9 is designed. The camshaft timing pin 9 is tightened by a tightening tool to fix the camshaft on the camshaft cover, thus fixing the camshaft in the initial timing position.

[0078] See Figure 1 As shown, the camshaft timing grooves are all located at the front ends of the right-hand camshaft 2, right-hand camshaft 3, left-hand camshaft 4, and left-hand camshaft 5.

[0079] The camshaft is a component with an extremely large shaft diameter ratio. Since the camshaft sprocket is installed at the front end of the camshaft via camshaft sprocket bolts, the front end of the camshaft is subjected to a large force when the camshaft sprocket bolts are tightened. If a camshaft timing groove is set at the rear end of the camshaft to fix the camshaft, the front and rear ends of the camshaft will bear a large load at the same time, which can easily cause the middle part of the camshaft to bend and deform, affecting the timing accuracy. Therefore, the camshaft timing groove is set near the front end of the camshaft, so that the force on the camshaft is concentrated at the front end, avoiding bending and deformation of the camshaft and affecting the timing accuracy.

[0080] See Figure 1 , 9 As shown, the flywheel fixing plate 8 is provided with threaded hole 8-2 and fixing tooth 8-1. After the fastener is screwed into the threaded hole 8-2, it is fixedly connected to the cylinder body, and the fixing tooth 8-1 is engaged with the flywheel 6.

[0081] The flywheel fixing plate 8 is clamped with the flywheel gear ring of the flywheel 6 through the fixing teeth 8-1, so as to fix the flywheel 6. The fastener is used to connect the flywheel fixing plate threaded hole 8-2 and the cylinder body at the same time, so as to fix the rear end of the crankshaft 1. In the embodiment, the fastener is a bolt.

[0082] Referring to Figure 1 , 2 , 3, 6, the layered assembly module 200 includes:

[0083] The oil pump chain assembly module 201 is used to connect the oil pump chain X1 with the oil pump driving sprocket 1-3, and place and tighten the oil pump bolt X3 in the oil pump sprocket X2, and install the oil pump tensioner X4.

[0084] The left camshaft chain assembly module 202 is used to connect the left camshaft chain Z1 with the left crankshaft sprocket 1-2 and wrap the left row camshaft sprocket Z2 and the left inlet camshaft sprocket Z6, install the left guide rail Z8, the left upper guide rail Z5, the left guide rail Z8 and the left tensioner Z9, and place the left row camshaft sprocket bolt Z3 in the left row camshaft sprocket Z2 without tightening, and place the left inlet camshaft sprocket bolt Z7 in the left inlet camshaft sprocket Z6 without tightening.

[0085] The right camshaft chain assembly module 203 is used to connect the right camshaft chain Y1 with the right crankshaft sprocket 1-1 and wrap the right row camshaft sprocket Y2 and the right inlet camshaft sprocket Y6, install the right guide rail Y8, the right upper guide rail Y5, the right guide rail Y4 and the right tensioner Y9, and place the right row camshaft sprocket bolt Y3 in the right row camshaft sprocket Y2 without tightening, and place the right inlet camshaft sprocket bolt Y7 in the right inlet camshaft sprocket Y6 without tightening.

[0086] The oil pump sprocket X2 is fixed on the oil pump, and then the chain and the tensioner and other accessories are arranged at the target position in the order of “oil pump chain assembly-left camshaft chain assembly-right camshaft chain assembly”.

[0087] Referring to Figure 1 , 2 The tensioning chain module 300 sequentially tensions the left camshaft chain Z1, the right camshaft chain Y1 and the oil pump chain X1 by sequentially tensioning the left tensioner Z9, the right tensioner Y9 and the oil pump tensioner S4.

[0088] After the step-by-step installation in the order of "oil pump chain set-left side camshaft chain set-right side camshaft chain set" through the layered assembly module 200, the left tensioner Z9, the right tensioner Y9 and the oil pump tensioner X4 are respectively tensioned in the order of "left side camshaft chain-right side camshaft chain-oil pump chain", so that the left side camshaft chain Z1, the right side camshaft chain Y1 and the oil pump chain X1 are respectively closely attached to the left side camshaft sprocket Z2, Z6, the right side camshaft sprocket Y2, Y6 and the oil pump sprocket X2, and the fitting clearance is eliminated.

[0089] Referring to Figure 1 、 2 , 7, the tightening camshaft sprocket module 400 comprises:

[0090] The determination tightening sequence module 401 is used for observing the positions of the right exhaust camshaft 2, the right intake camshaft 3, the left intake camshaft 4 and the left exhaust camshaft 5 at the front end of the engine, and taking the clockwise direction as the tightening sequence.

[0091] The sequentially tightening module 402 is used for sequentially tightening the right exhaust camshaft sprocket bolt Y3, the right intake camshaft sprocket bolt Y7, the left intake camshaft sprocket bolt Z7 and the left exhaust camshaft sprocket bolt Z3.

[0092] According to the rotation direction of the crankshaft 1, that is, observing the four camshafts of the chain structure at the front end of the engine, since the arrangement sequence of the four camshafts in the clockwise direction is the right exhaust camshaft 2, the right intake camshaft 3, the left intake camshaft 4 and the left exhaust camshaft 5 in turn, the right exhaust camshaft sprocket bolt Y3, the right intake camshaft sprocket bolt Y7, the left intake camshaft sprocket bolt Z7 and the left exhaust camshaft sprocket bolt Z3 are sequentially tightened, so as to fix the corresponding camshaft sprocket, complete the fastening of the camshaft and the camshaft sprocket, eliminate the fitting clearance between the crankshaft, the chain and the sprocket, realize the synchronous operation of the crankshaft 1 and the camshaft at all times, and eliminate the camshaft lag phenomenon.

[0093] Embodiment 2

[0094] Referring to Figure 1 、 2 , 11, the application embodiment provides a timing chain installation method of a V-type engine, which is completed by using the timing chain installation device of the V-type engine, and comprises the following steps:

[0095] S2, layered assembly: sequentially assemble the oil pump chain set, the left side camshaft chain set and the right side camshaft chain set, and tighten the oil pump sprocket X2;

[0096] S3, tensioning the chain: sequentially tension the left side camshaft chain Z1, the right side camshaft chain Y1 and the oil pump chain X1, and eliminate the fitting clearance;

[0097] S4, tighten camshaft sprocket: tighten the right row camshaft sprocket Y2, right in camshaft sprocket Y6, left row camshaft sprocket Z2 and left in camshaft sprocket Z6, clockwise direction as tightening sequence, eliminate the right row camshaft 2, right in camshaft 3, left in camshaft 4, left row camshaft 5 and right row camshaft sprocket Y2, right in camshaft sprocket Y6, left in camshaft sprocket Z6 and left row camshaft sprocket Z2 between the late timing of the valve train.

[0098] The chain assembly method eliminates the gap between the tight side of the chain and the camshaft, realizes the close fit of the chain and the camshaft and the crankshaft, ensures the simultaneous starting operation of the camshaft and the crankshaft 1, eliminates the delay phenomenon, improves the engine valve timing accuracy, thereby improving the engine performance and quality, reduces the failure rate, improves the maintainability and the whole machine reliability, and prolongs the service life of the engine.

[0099] Referring to Figure 1 , 2 , 11, S2 step before, also includes the following steps:

[0100] S1, initial positioning: through the positioning tool respectively crankshaft 1, right row camshaft 2, right in camshaft 3, left in camshaft 4 and left row camshaft 5 rotation adjustment to the initial position and fixed.

[0101] Effective positioning of crankshaft 1, camshaft, improve the initial timing accuracy of crankshaft, camshaft.

[0102] Finally, it should be noted that: the various embodiments of the present application are described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the related parts are described in the method part.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for assembling and adjusting the timing chain of a V-type engine, characterized in that, This is achieved using a timing chain adjustment device for a V-type engine, the device comprising: The layered assembly module (200) is used to assemble the oil pump chain assembly, the left camshaft chain assembly and the right camshaft chain assembly in sequence, and to tighten the oil pump sprocket (X2); The chain tensioning module (300) is used to tension the left camshaft chain (Z1), the right camshaft chain (Y1) and the oil pump chain (X1) in sequence. The camshaft sprocket tightening module (400) is used to tighten the right camshaft sprocket (Y2), the right infeed camshaft sprocket (Y6), the left camshaft sprocket (Z2), and the left infeed camshaft sprocket (Z6) in a clockwise direction. The assembly and adjustment method includes the following steps: Layered assembly: Assemble the oil pump chain assembly, the left camshaft chain assembly, and the right camshaft chain assembly in sequence, and tighten the oil pump sprocket (X2); Tension the chains: Tension the left camshaft chain (Z1), the right camshaft chain (Y1), and the oil pump chain (X1) in sequence to eliminate clearances; Tighten the camshaft sprockets: Tighten the right camshaft sprocket (Y2), right intake camshaft sprocket (Y6), left camshaft sprocket (Z2), and left intake camshaft sprocket (Z6) in a clockwise direction to eliminate valve timing lag between the right camshaft (2), right intake camshaft (3), left intake camshaft (4), and left camshaft (5) and the right camshaft sprocket (Y2), right intake camshaft sprocket (Y6), left intake camshaft sprocket (Z6), and left camshaft sprocket (Z2).

2. The timing chain assembly and adjustment method for a V-type engine according to claim 1, characterized in that, Before the layered assembly step, the following steps are also included: Initial positioning: The crankshaft (1), right camshaft (2), right intake camshaft (3), left intake camshaft (4) and left camshaft (5) are rotated and adjusted to the initial timing position and fixed by the positioning fixture.

3. The timing chain assembly and adjustment method for a V-type engine according to claim 2, characterized in that, An initial positioning module (100) is provided before the layered assembly module (200): The initial positioning module (100) is used to rotate and adjust the crankshaft (1), right camshaft (2), right intake camshaft (3), left intake camshaft (4) and left camshaft (5) to the initial timing position and fix them respectively by using positioning fixtures.

4. The timing chain adjustment method for a V-type engine according to claim 3, characterized in that, The initial positioning module (100) includes: A fixed crankshaft module (101) is used to set a crankshaft timing groove (1-4) on the crankshaft (1), and rotate the crankshaft (1) so that the crankshaft timing groove (1-4) is coaxial with the cylinder block timing hole; the tail of the crankshaft timing pin (7) is installed in the crankshaft timing groove (1-4), and the middle part of the crankshaft timing pin (7) is fixedly connected to the cylinder block; the rear end of the crankshaft (1) is connected to the flywheel (6), and the flywheel fixing plate (8) is installed on the flywheel (6), and the flywheel fixing plate (8) is fixedly connected to the cylinder block by fasteners; A fixed camshaft module (102) is provided for camshaft timing grooves on the right camshaft (2), the right inlet camshaft (3), the left inlet camshaft (4) and the left camshaft (5). The tail of the camshaft timing pin (9) is inserted into the camshaft timing groove, and the middle part of the camshaft timing pin (9) is fixedly connected to the camshaft cover.

5. The timing chain adjustment method for a V-type engine according to claim 4, characterized in that, The timing slots of the camshafts are all located at the front end of the right camshaft (2), the right entry camshaft (3), the left entry camshaft (4), and the left camshaft (5).

6. The timing chain adjustment method for a V-type engine according to claim 4, characterized in that, The flywheel fixing plate (8) is provided with a threaded hole (8-2) and a fixing tooth (8-1). The fastener is screwed into the threaded hole (8-2) and then fixedly connected to the cylinder body. The fixing tooth (8-1) is engaged with the flywheel (6).

7. The timing chain adjustment method for a V-type engine according to claim 3, characterized in that, The layered assembly module (200) includes: The oil pump chain assembly module (201) is used to connect the oil pump chain (X1) to the oil pump drive sprocket (1-3), and to place the oil pump bolt (X3) into the oil pump sprocket (X2) and tighten it, and to install the oil pump tensioner (X4). The left camshaft chain assembly module (202) is used to connect the left camshaft chain (Z1) to the left crankshaft sprocket (1-2) and fit it on the left row camshaft sprocket (Z2) and the left inlet camshaft sprocket (Z6), install the left tensioner (Z9), insert the left row camshaft sprocket bolt (Z3) into the left row camshaft sprocket (Z2) without tightening it, and insert the left inlet camshaft sprocket bolt (Z7) into the left inlet camshaft sprocket (Z6) without tightening it; The right camshaft chain assembly module (203) is used to connect the right camshaft chain (Y1) to the right crankshaft sprocket (1-1) and fit it on the right row camshaft sprocket (Y2) and the right inlet camshaft sprocket (Y6). The right tensioner (Y9) is installed, and the right row camshaft sprocket bolt (Y3) is inserted into the right row camshaft sprocket (Y2) without being tightened. The right inlet camshaft sprocket bolt (Y7) is inserted into the right inlet camshaft sprocket (Y6) without being tightened.

8. The timing chain adjustment method for a V-type engine according to claim 7, characterized in that, The tensioning chain module (300) tensions the left camshaft chain (Z1), the right camshaft chain (Y1), and the oil pump chain (X1) in sequence by tensioning the left tensioner (Z9), the right tensioner (Y9), and the oil pump tensioner (S4).

9. The timing chain adjustment method for a V-type engine according to claim 8, characterized in that, The tightening camshaft sprocket module (400) includes: The tightening sequence determination module (401) is used to observe the positions of the right camshaft (2), the right intake camshaft (3), the left intake camshaft (4) and the left camshaft (5) at the front end of the engine, and to tighten them in a clockwise direction. Tighten the module (402) in sequence to tighten the right camshaft sprocket bolt (Y3), the right inlet camshaft sprocket bolt (Y7), the left inlet camshaft sprocket bolt (Z7), and the left camshaft sprocket bolt (Z3) in sequence.

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