Assembly Method and Assembly Tooling for Engine Variable Valve Timing System

Abstract

The present application relates to an assembly method and an assembly tooling for an engine variable valve timing system. The assembly tooling includes: a fixed frame; a positioning shaft fixedly connected to the fixed frame. One end of the positioning shaft away from the fixed frame is provided with a first shaft section, a second shaft section and a third shaft section which are sequentially distributed in a stepped manner. The first shaft section is used for fitting with the inner diameter of the inner rotor, the third shaft section is used for fitting with the timing drive wheel, and the second shaft section is provided with a positioning pin hole for fitting with the pin shaft on the inner rotor; a positioning device coaxially arranged with the positioning shaft, which is used for sleeving the outer rotor on the outer peripheral side of the inner rotor and pressing the cover plate onto the outer rotor so that the threaded holes of the cover plate, the outer rotor and the timing drive wheel are aligned; a first jaw and a second jaw which are symmetrically arranged and connected to the fixed frame. The central axes of the first jaw and the second jaw are eccentrically arranged with respect to the central axis of the positioning shaft, and are used for clamping the timing drive wheel to move in the eccentric direction so as to control the phase of the radial runout of the phaser in a preset direction.

Description

Technical Field

[0001] This application relates to the technical field of vehicle engines, and particularly to an assembly method and an assembly tooling for an engine variable valve timing system. Background Art

[0002] The variable valve / camshaft timing (VVT or VCT for short) system adjusts the opening and closing time and the opening and closing angle of the valve according to different engine load conditions and rotational speeds by an electronic control unit (ECU), so that the engine operates in the most suitable power output and economic zone to improve the combustion efficiency.

[0003] As Figure 1 shown, the phaser is one of the most important components of the engine variable valve timing system. The phaser generally consists of an inner rotor N1, an outer rotor N2 and its accessories. Among them, the inner rotor N1 and the camshaft N6 are fixedly connected together through an oil control valve N5, and the rotation of the inner rotor N1 and the camshaft N6 is synchronous; the outer rotor N2 and the timing drive wheel N3 are fixedly connected together through a connecting bolt N4, and the timing drive wheel N3 and the crankshaft timing drive wheel are connected through a timing drive member to achieve synchronous rotation. When the inner rotor N1 rotates relative to the outer rotor N2, it means that the camshaft N6 is advanced or retarded in timing relative to the crankshaft.

[0004] In order to prevent jamming caused by thermal expansion of materials, there is a radial clearance between the inner and outer rotors. The radial clearance between the inner and outer rotors, the machining and assembly processes, the structural deflection, etc. will cause the rotation center of the timing drive wheel N3 fixed on the outer rotor N2 to be inconsistent with the rotation center of the camshaft N6, that is, the rotation of the timing drive wheel N3 has radial runout, resulting in an increase in the excitation of the timing chain, deterioration of the transmission characteristics of the transmission system, and even abnormal noise problems. Summary of the Invention

[0005] The purpose of this application is to provide an assembly method and an assembly tooling for an engine variable valve timing system, which can effectively control the negative impact brought by the phaser runout to the variable valve timing system and reduce the incidence of system abnormal noise.

[0006] In order to achieve the above purpose, the technical solutions adopted in this application are as follows:

[0007] In a first aspect, an assembly tool for an engine variable valve timing system is used to adjust the radial runout of a phaser at the end of a camshaft. The phaser includes an inner rotor, an outer rotor, and a cover plate arranged coaxially. The inner rotor is fixedly connected to the camshaft, and the cover plate is fixedly connected to the outer rotor and a timing drive wheel through connecting bolts. The assembly tool includes: a fixed frame; a positioning shaft fixedly connected to the fixed frame. One end of the positioning shaft away from the fixed frame is provided with a first shaft section, a second shaft section, and a third shaft section that are sequentially distributed in a stepped manner. Among them, the outer diameter of the second shaft section is greater than the outer diameter of the first shaft section and less than the outer diameter of the third shaft section. The first shaft section is used to cooperate with the inner diameter of the inner rotor, the third shaft section is used to cooperate with the timing drive wheel, and the second shaft section is provided with a positioning pin hole for cooperating with a pin shaft on the inner rotor; a positioning device coaxially arranged with the positioning shaft, which is used to sleeved the outer rotor on the outer peripheral side of the inner rotor and press the cover plate onto the inner rotor and the outer rotor, so that the mounting holes of the cover plate are aligned with the mounting holes of the outer rotor and the threaded holes of the timing drive wheel; and symmetrically arranged first and second jaws connected to the fixed frame. The central axes of the first and second jaws are eccentrically arranged with respect to the central axis of the positioning shaft. The first and second jaws are used to clamp the timing drive wheel and move it in the eccentric direction to control the phase of the radial runout of the phaser in a preset direction.

[0008] Further, the first and second jaws are rotatably connected to the fixed frame and are used to clamp the timing drive wheel in a preset angular direction and move it in the eccentric direction.

[0009] Further, the first and second jaws are fixedly connected to the fixed frame. The second shaft section is provided with two positioning pin holes, and the two positioning pin holes are spaced apart at a preset angle in the circumferential direction. The two positioning pin holes are respectively used to cooperate with the pin shafts on the inner rotors of the intake phaser and the exhaust phaser.

[0010] Further, the coaxiality error between the first shaft section and the second shaft section is 0 - 0.003 mm; and / or, the coaxiality error between the positioning device and the positioning shaft is 0 - 0.003 mm.

[0011] In a second aspect, an assembly method for an engine variable valve timing system is carried out by using the assembly tool for the engine variable valve timing system as described above. The assembly method includes: calculating the phase difference between the radial runout of the intake phaser and the radial runout of the exhaust phaser; moving the intake timing drive wheel of the intake phaser in the eccentric direction of the positioning shaft through the assembly tool to control the phase of the radial runout of the intake phaser in a first direction; moving the exhaust timing drive wheel of the exhaust phaser in the eccentric direction of the positioning shaft through the assembly tool to control the phase of the radial runout of the exhaust phaser in a second direction, where the angular difference between the first direction and the second direction is the phase difference; assembling the intake timing drive wheel, the exhaust timing drive wheel, and the transmission parts to the engine according to the timing marks.

[0012] Further, calculating the phase difference between the radial runout of the intake phaser and the radial runout of the exhaust phaser includes: when calculating that the running length of the transmission part is the center distance L between the intake camshaft and the exhaust camshaft, the angle a turned by any one of the intake timing drive wheel and the exhaust timing drive wheel is a = 360 * L / S, where S is the pitch circle circumference of any one of the intake timing drive wheel and the exhaust timing drive wheel; along the rotation direction of the transmission part, the phase difference between the radial runout of any one of the intake timing drive wheel and the exhaust timing drive wheel and the radial runout of the other is b = 180° - a.

[0013] Further, the first jaw and the second jaw are rotatably connected to the fixed bracket; controlling the phase of the radial runout of the intake phaser by moving the intake timing drive wheel of the intake phaser towards the eccentric direction of the positioning shaft through the assembly tooling includes: sleeving the intake timing drive wheel on the end face of the third shaft section of the positioning shaft of the assembly tooling; sleeving the inner rotor of the intake phaser on the second shaft section of the positioning shaft, and inserting the positioning pin on the inner rotor into the positioning pin hole on the second shaft section; taking the inner rotor as a reference, sleeving the outer rotor of the intake phaser on the inner rotor through the positioning device of the assembly tooling, and rotating the intake timing drive wheel to make the mounting hole of the outer rotor correspond to the threaded hole of the intake timing drive wheel; placing the cover plate of the intake phaser on the inner rotor and the outer rotor through the positioning device, and sequentially passing the connecting bolts through the mounting hole of the cover plate, the mounting hole of the outer rotor and the threaded hole of the intake timing drive wheel; controlling the first jaw and the second jaw of the assembly tooling to clamp the intake timing drive wheel so that the intake timing drive wheel moves towards the eccentric direction; tightening the connecting bolts.

[0014] Further, controlling the phase of the radial runout of the exhaust phaser by moving the exhaust timing drive wheel of the exhaust phaser towards the eccentric direction of the positioning shaft through the assembly tooling includes: sleeving the exhaust timing drive wheel on the end face of the third shaft section of the positioning shaft of the assembly tooling; sleeving the inner rotor of the exhaust phaser on the second shaft section of the positioning shaft, and inserting the positioning pin on the inner rotor into the positioning pin hole on the second shaft section; controlling the first jaw and the second jaw of the assembly tooling to rotate a preset angle, and the preset angle is the phase difference; taking the inner rotor as a reference, sleeving the outer rotor of the exhaust phaser on the inner rotor through the positioning device of the assembly tooling, and rotating the exhaust timing drive wheel to make the mounting hole of the outer rotor correspond to the threaded hole of the exhaust timing drive wheel; placing the cover plate of the exhaust phaser on the inner rotor and the outer rotor through the positioning device, and sequentially passing the connecting bolts through the mounting hole of the cover plate, the mounting hole of the outer rotor and the threaded hole of the exhaust timing drive wheel; controlling the first jaw and the second jaw of the assembly tooling to clamp the exhaust timing drive wheel along the preset angle direction so that the exhaust timing drive wheel moves towards the eccentric direction; tightening the connecting bolts.

[0015] Further, the first jaw and the second jaw are fixedly connected to the fixed frame. The second shaft section is provided with two positioning pin holes, and the two positioning pin holes are circumferentially spaced apart at a preset angle, and the preset angle is the phase difference. Controlling the phase of the radial runout of the intake phaser in the first direction by moving the intake timing drive wheel of the intake phaser towards the eccentric direction of the positioning shaft through an assembly tooling includes: sleeving the intake timing drive wheel on the end face of the third shaft section of the positioning shaft of the assembly tooling; sleeving the inner rotor of the intake phaser on the second shaft section of the positioning shaft, and inserting the positioning pin on the inner rotor into one of the positioning pin holes on the second shaft section; taking the inner rotor as a reference, sleeving the outer rotor of the intake phaser on the inner rotor through the positioning device of the assembly tooling, and rotating the intake timing drive wheel to make the mounting hole of the outer rotor correspond to the threaded hole of the intake timing drive wheel; placing the cover plate of the intake phaser on the inner rotor and the outer rotor through the positioning device, and sequentially passing the connecting bolts through the mounting hole of the cover plate, the mounting hole of the outer rotor and the threaded hole of the intake timing drive wheel; controlling the first jaw and the second jaw of the assembly tooling to clamp the intake timing drive wheel so that the intake timing drive wheel moves towards the eccentric direction; and tightening the connecting bolts.

[0016] Further, controlling the phase of the radial runout of the exhaust phaser in the second direction by moving the exhaust timing drive wheel of the exhaust phaser towards the eccentric direction of the positioning shaft through an assembly tooling includes: sleeving the exhaust timing drive wheel on the end face of the third shaft section of the positioning shaft of the assembly tooling; sleeving the inner rotor of the exhaust phaser on the second shaft section of the positioning shaft, and inserting the positioning pin on the inner rotor into the other positioning pin hole on the second shaft section; taking the inner rotor as a reference, sleeving the outer rotor of the exhaust phaser on the inner rotor through the positioning device of the assembly tooling, and rotating the exhaust timing drive wheel to make the mounting hole of the outer rotor correspond to the threaded hole of the exhaust timing drive wheel; placing the cover plate of the exhaust phaser on the inner rotor and the outer rotor through the positioning device, and sequentially passing the connecting bolts through the mounting hole of the cover plate, the mounting hole of the outer rotor and the threaded hole of the exhaust timing drive wheel; controlling the first jaw and the second jaw of the assembly tooling to clamp the exhaust timing drive wheel so that the exhaust timing drive wheel moves towards the eccentric direction; and tightening the connecting bolts.

[0017] Assembly method and assembly tooling for an engine variable valve timing system according to an embodiment of the present application. The assembly tooling includes a fixed frame; a positioning shaft fixedly connected to the fixed frame, with a first shaft section, a second shaft section, and a third shaft section arranged in a stepped manner at one end of the positioning shaft away from the fixed frame. Among them, the outer diameter of the second shaft section is greater than that of the first shaft section and less than that of the third shaft section. The first shaft section is used to cooperate with the inner rotor, the third shaft section is used to cooperate with the timing drive wheel, and the second shaft section is provided with a positioning pin hole for cooperating with the pin shaft on the inner rotor; a positioning device coaxially arranged with the positioning shaft, which is used to sleeved the outer rotor on the outer peripheral side of the inner rotor and press the cover plate onto the inner rotor and the outer rotor, so that the mounting hole of the cover plate is aligned with the mounting hole of the outer rotor and the threaded hole of the timing drive wheel; and symmetrically arranged first and second jaws connected to the fixed frame, with the central axes of the first and second jaws eccentrically arranged with respect to the central axis of the positioning shaft. The first and second jaws are used to clamp the timing drive wheel and move it in the eccentric direction to control the phase of the radial runout of the phaser in a preset direction. Thus, by eccentrically arranging the central axes of the first and second jaws with respect to the central axis of the positioning shaft, during the process of clamping the timing drive wheel by the first and second jaws and moving it in the eccentric direction, the phase of the radial runout of the phaser can be fixed to the preset direction, so that the phases of the radial runouts of the intake timing drive wheel and the exhaust timing drive wheel can be staggered by a preset phase angle, enabling the peak values of the running fluctuations of the transmission parts to cancel each other out, avoiding the superposition of the peak values of the running fluctuations caused by the radial runouts of the intake timing drive wheel and the exhaust timing drive wheel to generate greater noise, and the noise energy is attenuated. Therefore, the negative impact of the phaser runout on the variable valve timing system can be effectively controlled, and the incidence of system abnormal noise can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic structural diagram of a phaser of an engine variable valve timing system in the related art;

[0019] Figure 2 Schematic structural diagram of the assembly tooling for the engine variable valve timing system provided by the embodiment of the present application;

[0020] Figure 3 Show Figure 2 Top view of an assembly tooling shown;

[0021] Figure 4 Show Figure 2 Top view of another assembly tooling shown;

[0022] Figure 5 Show Figure 2 Schematic diagram of the assembly effect of the assembly tooling and the phaser shown;

[0023] Figure 6 Schematic diagram of the phase combination structure showing the radial runout of the intake phaser and the exhaust phaser

[0024] Figure 7 Flow chart showing the assembly method of the engine variable valve timing system provided by the embodiments of the present application

[0025] Figure 8 Effect diagram of the simulation analysis of the knocking abnormal sound during the assembly of the variable valve timing system

[0026] Wherein, N1, inner rotor; N2, outer rotor; N3, timing drive wheel; N4, connecting bolt; N5, oil control valve; N6, camshaft; N7, cover plate; N8, threaded hole; N10, pin shaft

[0027] 1, intake phaser; M1, runout direction of the intake timing drive wheel; 2, exhaust phaser; M2, runout direction of the exhaust timing drive wheel; 3, crankshaft drive wheel; 4, tensioner; 5, moving rail; 6, fixed rail; 7, transmission part

[0028] 10, positioning shaft; 11, first shaft section; 12, second shaft section; 121, positioning pin hole; 13, third shaft section; 21, first jaw; 22, second jaw Detailed implementation mode

[0029] The following will describe the implementation modes of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for explaining the present invention, rather than for limiting the protection scope of the present invention

[0030] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The diagrams only show the components related to the present invention, rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex

[0031] Such as Figure 1 And Figure 6As shown, taking a four-cylinder four-stroke engine as an example, the variable valve timing system is arranged at the front end of the engine. Looking from the front end towards the flywheel end of the crankshaft, the Z direction is upward parallel to the center line of the cylinder. The function of the intake and exhaust valves is to open or close on time, so that fresh air can be timely filled into the combustion chamber and combustion exhaust gas can be timely discharged. Among them, the intake camshaft is arranged on the left side, and an intake phaser 1 is configured at the end of the intake camshaft; the exhaust camshaft is arranged on the right side, and an exhaust phaser 2 is configured at the end of the exhaust camshaft. The crankshaft and the crankshaft drive pulley 3 are located at the lower side. The outer rotor N2 of the intake phaser 1 and the timing drive pulley N3 of the intake camshaft are fixed together by bolts, and the outer rotor N2 of the exhaust phaser 2 and the timing drive pulley N3 of the exhaust camshaft are fixed together by bolts; the transmission member 7 is respectively drivingly connected with the timing drive pulley N3 of the intake phaser 1, the timing drive pulley of the exhaust phaser 2, and the crankshaft drive pulley 3. Among them, a moving rail 5 is arranged on one side of the transmission member 7, and a fixed rail 6 is arranged on the other side.

[0032] Angle sensors are also respectively arranged on the crankshaft drive pulley 3, the intake camshaft, and the exhaust camshaft. The electronic control unit ECU judges the phase reference according to the crankshaft signal, then judges the phase of the camshaft according to the camshaft signal and its position relative to the crankshaft signal, and then adjusts the phase of the camshaft according to the information from other sensors according to different engine operating conditions.

[0033] In addition, in order to improve the tension between the transmission member 7 and the timing drive pulley N3 of the intake phaser 1, the timing drive pulley N3 of the exhaust phaser 2, and the crankshaft drive pulley 3, a tensioner 4 is also arranged between the moving rail 5 adjacent to the crankshaft drive pulley 3 and the transmission member 7. The tensioner 4 includes a plunger that can move axially along itself.

[0034] As Figures 2 to 6 shown, the embodiment of the present application provides an assembly tool for an engine variable valve timing system, which is used to adjust the radial runout of the phaser at the end of the camshaft. The phaser includes an inner rotor N1, an outer rotor N2, and a cover plate N7 arranged coaxially. The inner rotor N1 is fixedly connected with the camshaft, and the cover plate N7 is fixedly connected with the outer rotor N2 and the timing drive pulley N3 through a connecting bolt N4.

[0035] The assembly tool includes: a fixing frame (not shown in the figure), a positioning shaft 10, symmetrically arranged first jaws 21 and second jaws 22, and a positioning device (not shown in the figure).

[0036] The positioning shaft 10 is fixedly connected to the fixing bracket. At one end of the positioning shaft 10 away from the fixing bracket, there are arranged a first shaft section 11, a second shaft section 12, and a third shaft section 13 that are distributed in a stepped manner in sequence. Among them, the outer diameter of the second shaft section 12 is greater than the outer diameter of the first shaft section 11 and less than the outer diameter of the third shaft section 13. The first shaft section 11 is used for fitting with the inner diameter of the inner rotor, the third shaft section 13 is used for fitting with the timing drive wheel N3, and the second shaft section 12 is provided with a positioning pin hole 121, and the positioning pin hole 121 is used for fitting with the pin shaft N10 on the inner rotor N1.

[0037] The positioning device is coaxially arranged with the positioning shaft 10. The positioning device is used for sleeving the outer rotor N2 on the outer peripheral side of the inner rotor N1, and pressing the cover plate N7 onto the inner rotor N1 and the outer rotor N2, so that the mounting holes of the cover plate N7 are aligned with the mounting holes of the outer rotor N2 and the threaded holes of the timing drive wheel N3.

[0038] The symmetrically arranged first jaw 21 and second jaw 22 are connected to the fixing bracket. The central axis L2 of the first jaw 21 and the second jaw 22 is eccentrically arranged with respect to the central axis L1 of the positioning shaft 10, and the eccentricity is e. The first jaw 21 and the second jaw 22 are used for clamping the timing drive wheel N3 to move in the eccentric direction, so as to fix the phase of the radial runout of the phaser to a preset direction. Then, the cover plate N7 is fixedly connected to the outer rotor N2 and the timing drive wheel N3 through the connecting bolt N4.

[0039] In this embodiment, as Figure 2 shown, the positioning pin hole 121 can be fitted with the pin shaft N10 on the inner rotor N1 of the phaser. After the outer rotor N2 is sleeved on the inner rotor N1 through the positioning device, the timing drive wheel N3 is rotated so that the mounting holes of the outer rotor are aligned with the threaded holes of the timing drive wheel N3, and then the cover plate N7 is pressed onto the inner rotor N1 and the outer rotor N2 so that the mounting holes of the cover plate N7 are aligned with the mounting holes of the outer rotor N2; then, the timing drive wheel N3 is clamped by the first jaw 21 and the second jaw 22 and moved in the eccentric direction, and finally the cover plate N7 is fixedly connected to the outer rotor N2 and the timing drive wheel N3 through the connecting bolt N4, so that the radial runout between the outer rotor N2 and the inner rotor N1 of the phaser can be fixed to a preset direction.

[0040] Furthermore, the intake phaser 1 and the exhaust phaser 2 of the engine variable valve timing system can respectively fix their radial runouts to preset directions through an assembly tooling, and there is a phase difference of a preset angle between the preset directions of their radial runouts, so that the radial runout phases of the outer rotor N2 of the intake phaser 1 and the outer rotor N2 of the exhaust phaser 2 can be staggered by a preset angle arrangement, avoiding the superposition of the running fluctuation peaks of the transmission parts caused by the radial runouts of the intake timing drive wheel and the exhaust timing drive wheel and generating greater noise.

[0041] According to the assembly tooling of the engine variable valve timing system of the embodiments of the present application, by eccentrically arranging the central axes between the first jaw 21 and the second jaw 22 and the central axis of the positioning shaft 10, during the process of clamping the timing drive wheel N3 by the first jaw 21 and the second jaw 22 and moving it in the eccentric direction, the phase of the radial runout of the phaser can be fixed to a preset direction, so that the phases of the radial runouts of the intake timing drive wheel and the exhaust timing drive wheel can be staggered by a preset phase angle, so that the peak values of the running fluctuations of the transmission parts cancel each other out, avoiding the superposition of the peak values of the running fluctuations of the transmission parts caused by the radial runouts of the intake timing drive wheel and the exhaust timing drive wheel to generate greater noise, and the noise energy is attenuated, so that the negative impact brought by the phaser runout to the variable valve timing system can be effectively controlled, and the incidence of system abnormal noise can be reduced.

[0042] In some embodiments, the first jaw 21 and the second jaw 22 are rotatably connected to the fixing frame, and are used to clamp the timing drive wheel N3 in the preset angular direction and move it in the eccentric direction.

[0043] As Figure 3 shown, the assembly tooling can adjust the rotation angles of the first jaw 21 and the second jaw 22 in the circumferential direction of the positioning shaft 10, as Figure 3 shown by the arrow direction in the figure, and then move the phases of the radial runouts of the respective timing drive wheels N3 of the intake phaser 1 or the exhaust phaser 2 in the circumferential direction in the eccentric direction, for example, move towards the position of the first jaw 21, and after determining the radial runout phase of the intake phaser 1 or the exhaust phaser 2, fixedly connect the timing drive wheel N3 with the outer rotor N2 and the cover plate N7 through the connecting bolt N4.

[0044] In addition, the rotation angles of the first jaw 21 and the second jaw 22 in the circumferential direction of the positioning shaft 10 can be determined according to the phase difference between the radial runout of the intake phaser 1 and the radial runout of the exhaust phaser 2 in the variable valve timing system, which will be described in detail later.

[0045] In some embodiments, the first jaw 21 and the second jaw 22 are fixedly connected to the fixing frame, the second shaft section 12 is provided with two positioning pin holes 121, and the two positioning pin holes 121 are distributed at a preset angular interval in the circumferential direction, and the two positioning pin holes 121 are respectively used to cooperate with the pin shafts on the inner rotor N1 of the intake phaser 1 and the pin shafts on the inner rotor N1 of the exhaust phaser 2.

[0046] As Figure 4 shown, the assembly tooling can respectively cooperate the pin shafts on the inner rotors N1 of the intake phaser 1 and the exhaust phaser 2 with the two positioning pin holes 121, as Figure 4As shown by the arrow directions, the two positioning pin holes 121 are circumferentially distributed at a preset angular interval. By the first jaw 21 and the second jaw 22, the phase of the radial runout of the respective timing drive wheel N3 of the intake phaser 1 or the exhaust phaser 2 in the circumferential direction is moved in the eccentric direction, for example, moved towards the position of the first jaw 21. After determining the radial runout direction of the intake phaser 1 or the exhaust phaser 2, the timing drive wheel N3, the outer rotor N2 and the cover plate N7 are fixedly connected by the connecting bolts N4.

[0047] In addition, the two positioning pin holes 121 are circumferentially distributed at a preset angular interval, and the preset angle can be determined according to the phase difference between the radial runout of the intake phaser 1 and the radial runout of the exhaust phaser 2 in the variable valve timing system, which will be described in detail later.

[0048] Furthermore, the coaxiality error between the first shaft section 11 and the second shaft section 12 is 0 to 0.003 mm.

[0049] As Figure 1 shown, since the outer diameter of the first shaft section 11 is consistent with the minimum nominal inner diameter of the inner rotor N1, that is, the first shaft section 11 is fitted with the inner rotor N1, the positioning pin holes 121 of the second shaft section 12 are used to cooperate with the pin shafts N10 on the inner rotor N1, and the inner rotor N1 is fixedly connected to the camshaft N6. The coaxiality error between the first shaft section 11 and the second shaft section 12 will affect the radial runout of the phaser. In this embodiment, restricting the coaxiality error between the first shaft section 11 and the second shaft section 12 can reduce the influence of the machining and manufacturing error of the assembly tooling itself on the radial runout of the timing drive wheel N3, which is beneficial to reducing the assembly error of the variable valve timing system.

[0050] Furthermore, the coaxiality error between the positioning device and the positioning shaft 10 is 0 to 0.003 mm. Specifically, the positioning device includes a convex shaft, the convex shaft is coaxially arranged with the positioning shaft 10, the convex shaft is used to cooperate with the central hole of the cover plate N7, and the length of the convex shaft is less than the thickness of the cover plate N7. The positioning device further includes a clamping portion provided on the outer peripheral side of the convex shaft for clamping the outer rotor and sleeving the outer rotor on the outer peripheral side of the inner rotor. Similarly, the coaxiality error between the positioning device and the positioning shaft 10 will also affect the radial runout of the phaser. In this embodiment, restricting the coaxiality error between the positioning device and the positioning shaft 10 can reduce the influence of the machining and manufacturing error of the assembly tooling itself on the radial runout of the timing drive wheel N3, which is beneficial to reducing the assembly error of the variable valve timing system.

[0051] As Figure 7 shown, the embodiment of the present application provides an assembly method for an engine variable valve timing system, which is assembled by using the assembly tooling for the engine variable valve timing system as described above. The assembly method includes the following steps S1 to S4. The following will be combined with Figures 1 to 5Describe in detail the specific steps of the assembly method.

[0052] Step S1: Calculate the phase difference between the radial runout of the intake phaser 1 and the radial runout of the exhaust phaser 2.

[0053] Step S2: Move the intake timing sprocket of the intake phaser in the eccentric direction of the positioning shaft through the assembly tooling to control the phase of the radial runout of the intake phaser in the first direction.

[0054] Step S3: Move the exhaust timing sprocket of the exhaust phaser in the eccentric direction of the positioning shaft through the assembly tooling to control the phase of the radial runout of the exhaust phaser in the second direction, where the angular difference between the first direction and the second direction is the phase difference.

[0055] Step S4: Assemble the intake timing sprocket N3, the exhaust timing sprocket N3, and the transmission part N7 to the engine according to the timing marks.

[0056] In one example, both the intake timing sprocket and the exhaust timing sprocket are chain wheels, and the transmission part is a timing chain. In another example, both the intake timing sprocket and the exhaust timing sprocket are belt pulleys, and the transmission part is a timing belt. For the convenience of description, the embodiments of the present application are described by taking both the intake timing sprocket and the exhaust timing sprocket as timing chain wheels and the transmission part as a timing chain as an example.

[0057] Timing marks are respectively provided on the timing chain corresponding to the intake timing sprocket, the exhaust timing sprocket, and the crankshaft sprocket to ensure that the timing drive system is correctly assembled according to the preset requirements. As Figure 6 shown, after being assembled according to the assembly method of this embodiment, the runout direction mark of the left intake timing sprocket is M1, and the runout direction mark of the right exhaust timing sprocket is M2.

[0058] According to the assembly method of the engine variable valve timing system of the embodiments of the present application, by eccentrically arranging the central axes of the first jaw 21 and the second jaw 22 with respect to the central axis of the positioning shaft 10, during the process of clamping the timing sprocket N3 by the first jaw 21 and the second jaw 22 and moving it in the eccentric direction, the phase of the radial runout of the phaser can be fixed to the preset direction, so that the phases of the radial runouts of the intake timing sprocket and the exhaust timing sprocket can be staggered by a preset phase angle, so that the peak values of the running fluctuations of the transmission part cancel each other out, avoiding the superposition of the peak values of the running fluctuations of the transmission part caused by the radial runouts of the intake timing sprocket and the exhaust timing sprocket to generate greater noise, and the noise energy is attenuated, so that the negative impact of the phaser runout on the variable valve timing system can be effectively controlled, and the incidence of system abnormal noise can be reduced.

[0059] Further, in step S1, calculating the phase difference between the radial runout of the intake phaser 1 and the radial runout of the exhaust phaser 2 includes:

[0060] Step S11: When calculating that the running length of the transmission member is the center distance L between the intake camshaft and the exhaust camshaft, the angle a turned by either the intake timing transmission wheel N3 or the exhaust timing transmission wheel N3 is a = 360 * L / S, where S is the pitch circle circumference of either the intake timing transmission wheel N3 or the exhaust timing transmission wheel N3;

[0061] Step S12: Along the rotation direction of the transmission member, the phase difference b between the radial runout of either the intake timing transmission wheel N3 or the exhaust timing transmission wheel N3 and the radial runout of the other is b = 180° - a.

[0062] Assume Figure 6 For the intake timing transmission wheel on the left and the exhaust timing transmission wheel on the right in [], both rotate counterclockwise with the transmission member 7. When calculating that the running length of the transmission member 7 is the center distance L between the intake camshaft and the exhaust camshaft, the angle a turned by the right exhaust timing transmission wheel is a = 360 * L / S, where S is the pitch circle circumference of the exhaust timing transmission wheel. For example, when the ratio of the center distance L to the pitch circle circumference S is 3 / 8, when the running length of the transmission member 7 is the center distance L, the angle a turned by the right intake timing transmission wheel is a = 135°. Then the phase difference b between the radial runout of the left intake timing transmission wheel and the radial runout of the right intake timing transmission wheel is b = 180° - 135° = 45°, that is to say, the phase of the radial runout of the left intake timing transmission wheel lags behind the phase of the radial runout of the right intake timing transmission wheel by 45°.

[0063] It can be understood that when Figure 6 For the intake timing transmission wheel on the left and the exhaust timing transmission wheel on the right in [], both rotate clockwise with the transmission member 7, the phase of the radial runout of the right exhaust timing transmission wheel will lag behind the phase of the radial runout of the left intake timing transmission wheel by 45°, which will not be elaborated here.

[0064] In some embodiments, the first jaw 21 and the second jaw 22 are rotatably connected to the fixed frame; as Figure 3 shown, in step S2, moving the intake timing transmission wheel of the intake phaser 1 towards the eccentric direction of the positioning shaft 10 through the assembly tooling to control the phase of the radial runout of the intake phaser 1 in the first direction includes:

[0065] Step S21: Sleeving the intake timing transmission wheel N3 on the end face of the third shaft section 13 of the positioning shaft 10 of the assembly tooling;

[0066] Step S22: Fit the inner rotor of the intake phaser 1 onto the second shaft segment 12 of the positioning shaft 10, and insert the positioning pin on the inner rotor into the positioning pin hole 121 on the second shaft segment 12;

[0067] Step S23: With the inner rotor as a reference, fit the outer rotor N2 of the intake phaser 1 onto the inner rotor through the positioning device of the assembly tooling, and rotate the intake timing drive wheel N3 to align the mounting hole of the outer rotor N2 with the threaded hole N8 of the intake timing drive wheel N3;

[0068] Step S24: Place the cover plate N7 of the intake phaser 1 on the inner rotor N1 and the outer rotor N2 through the positioning device, and sequentially insert the connecting bolt N4 through the mounting hole of the cover plate N7, the mounting hole of the outer rotor N2, and the threaded hole N8 of the intake timing drive wheel N3;

[0069] Step S25: Control the first jaw 21 and the second jaw 22 of the assembly tooling to clamp the intake timing drive wheel N3, so that the intake timing drive wheel N3 moves towards the eccentric direction;

[0070] Step S26: Tighten the connecting bolt N4.

[0071] Further, in step S3, moving the exhaust timing drive wheel of the exhaust phaser 2 towards the eccentric direction of the positioning shaft 10 through the assembly tooling to control the phase of the radial runout of the exhaust phaser 2 in the second direction includes:

[0072] Step S31: Fit the exhaust timing drive wheel N3 onto the end face of the third shaft segment 13 of the positioning shaft 10 of the assembly tooling;

[0073] Step S32: Fit the inner rotor of the exhaust phaser 2 onto the second shaft segment 12 of the positioning shaft 10, and insert the positioning pin on the inner rotor into the positioning pin hole 121 on the second shaft segment 12;

[0074] Step S33: Control the first jaw 21 and the second jaw 22 of the assembly tooling to rotate by a preset angle, and the preset angle is the phase difference;

[0075] Step S34: With the inner rotor as a reference, fit the outer rotor N2 of the exhaust phaser 2 onto the inner rotor through the positioning device of the assembly tooling, and rotate the exhaust timing drive wheel N3 to align the mounting hole of the outer rotor N2 with the threaded hole N8 of the exhaust timing drive wheel N3;

[0076] Step S35: Place the cover plate N7 of the exhaust phaser 2 on the inner rotor N1 and the outer rotor N2 through the positioning device, and sequentially insert the connecting bolt N4 through the mounting hole of the cover plate N7, the mounting hole of the outer rotor N2, and the threaded hole N8 of the exhaust timing drive wheel N3;

[0077] Step S36: Control the first clamping jaw 21 and the second clamping jaw 22 of the assembly tool to clamp the exhaust timing transmission wheel N3 along a preset angle direction, so that the exhaust timing transmission wheel N3 moves toward the eccentric direction;

[0078] Step S36: Tighten the connecting bolt N4.

[0079] In this embodiment, the first clamping jaw 21 and the second clamping jaw 22 of the assembly tool are rotatably connected to the fixing frame, and a positioning pin hole 121 is provided on the second shaft section 12 of the positioning shaft 10, and the pin shaft on the inner rotor N1 of either the intake phaser 1 or the exhaust phaser 2 can be connected to the positioning pin hole 121, so that the radial runout of the intake phaser 1 and the radial runout of the exhaust phaser 2 can be fixed in a preset direction respectively by clamping the intake timing transmission wheel or the exhaust timing transmission wheel, and it can be ensured that the phase of the radial runout of the intake phaser 1 and the phase of the radial runout of the exhaust phaser 2 maintain the phase difference as described above.

[0080] In some embodiments, the first clamping jaw 21 and the second clamping jaw 22 are fixedly connected to the fixing frame, the second shaft segment 12 is provided with two positioning pin holes 121, and the two positioning pin holes 121 are distributed at a preset angle interval along the circumferential direction, and the preset angle is the phase difference; Figure 4 As shown, in step S2, moving the intake timing drive wheel of the intake phaser toward the eccentric direction of the positioning shaft by means of an assembly tool to control the phase of the radial runout of the intake phaser in the first direction includes:

[0081] Step S21': sleeve the intake timing transmission wheel N3 onto the end surface of the third shaft section 13 of the positioning shaft 10 of the assembly tool;

[0082] Step S22': sleeve the inner rotor of the intake phaser 1 onto the second shaft section 12 of the positioning shaft 10, and insert the positioning pin on the inner rotor into one of the positioning pin holes 121 on the second shaft section 12;

[0083] Step S23': With the inner rotor as a reference, the outer rotor N2 of the intake phaser 1 is mounted on the inner rotor by means of a positioning device of an assembly tool, and the intake timing transmission wheel N3 is rotated so that the mounting hole of the outer rotor N2 corresponds to the threaded hole N8 of the intake timing transmission wheel N3;

[0084] Step S24': placing the cover plate N7 of the intake phaser 1 on the inner rotor N1 and the outer rotor N2 by means of a positioning device, and inserting the connecting bolt N4 through the mounting hole of the cover plate N7, the mounting hole of the outer rotor N2 and the threaded hole N8 of the intake timing transmission wheel N3 in sequence;

[0085] Step S25': Control the first jaw 21 and the second jaw 22 of the assembly tooling to clamp the intake timing drive wheel N3, so that the intake timing drive wheel N3 moves towards the eccentric direction;

[0086] Step S26': Tighten the connecting bolt N4.

[0087] Further, in step S3, moving the exhaust timing drive wheel of the exhaust phaser 2 towards the eccentric direction of the positioning shaft 10 through the assembly tooling to control the phase of the radial runout of the exhaust phaser 2 in the second direction includes:

[0088] Step S31': Fit the exhaust timing drive wheel N3 onto the end face of the third shaft section 13 of the positioning shaft 10 of the assembly tooling;

[0089] Step S32': Fit the inner rotor of the exhaust phaser 2 onto the second shaft section 12 of the positioning shaft 10, and insert the positioning pin on the inner rotor into another positioning pin hole 121 on the second shaft section 12;

[0090] Step S33': Taking the inner rotor as a reference, fit the outer rotor N2 of the exhaust phaser 2 onto the inner rotor through the positioning device of the assembly tooling, and rotate the exhaust timing drive wheel N3 to make the mounting hole of the outer rotor N2 correspond to the threaded hole N8 of the exhaust timing drive wheel N3;

[0091] Step S34': Place the cover plate N7 of the exhaust phaser 2 on the inner rotor N1 and the outer rotor N2 through the positioning device, and sequentially pass the connecting bolt N4 through the mounting hole of the cover plate N7, the mounting hole of the outer rotor N2, and the threaded hole N8 of the exhaust timing drive wheel N3;

[0092] Step S35': Control the first jaw 21 and the second jaw 22 of the assembly tooling to clamp the exhaust timing drive wheel N3, so that the exhaust timing drive wheel N3 moves towards the eccentric direction;

[0093] Step S36': Tighten the connecting bolt N4.

[0094] In this embodiment, the first jaw 21 and the second jaw 22 of the assembly tooling are fixedly connected to the fixed frame. At the same time, two positioning pin holes 121 are arranged at preset angular intervals along the circumferential direction of the second shaft section 12 of the positioning shaft 10. The preset angle is equal to the phase difference as described above. The pin shafts on the inner rotors N1 of the intake phaser 1 and the exhaust phaser 2 are respectively connected to one of the positioning pin holes 121. Thus, the intake timing drive wheel or the exhaust timing drive wheel can be clamped by the first jaw 21 and the second jaw 22, and the radial runouts of the intake phaser 1 and the exhaust phaser 2 are respectively fixed in the preset direction, and it can be ensured that the phases of the radial runouts of the intake phaser 1 and the exhaust phaser 2 maintain the phase difference as described above.

[0095] Figure 8 It shows the simulation analysis effect diagram of the knocking abnormal sound of the variable valve timing system. Since the camshaft speed of the four-cylinder four-stroke engine is half of the crankshaft speed, the phaser jump will cause an increase in the 0.5th order excitation of the timing chain. After assembling the variable valve timing system with the above-mentioned assembly tooling in this embodiment, the 0.5th order plunger displacement amplitude of the tensioner 4 of the engine variable valve timing system is reduced by about 85%. After actual measurement, the knocking abnormal sound of the system disappears, effectively reducing the risk of the occurrence of the 0.5th order knocking abnormal sound of the engine timing.

[0096] It should be noted that the phrases such as "one embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining specific features, structures or characteristics with an embodiment, it is within the knowledge scope of those skilled in the art to implement such features, structures or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0097] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0098] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An assembly tool for an engine variable valve timing system, which is used to adjust the radial runout of a phaser at the end of a camshaft. The phaser includes an inner rotor, an outer rotor and a cover plate which are coaxially arranged. The inner rotor is fixedly connected to the camshaft, and the cover plate is fixedly connected to the outer rotor and a timing drive wheel through connecting bolts. It is characterized in that, The assembly tooling includes: A fixed frame; A positioning shaft fixedly connected to the fixed frame. At one end of the positioning shaft away from the fixed frame, there are a first shaft section, a second shaft section, and a third shaft section distributed in a stepped manner in sequence. Wherein, the outer diameter of the second shaft section is greater than the outer diameter of the first shaft section and less than the outer diameter of the third shaft section. The first shaft section is used to cooperate with the inner diameter of the inner rotor, the third shaft section is used to cooperate with the timing drive wheel, and the second shaft section is provided with a positioning pin hole for cooperating with the pin shaft on the inner rotor; A positioning device coaxially arranged with the positioning shaft. The positioning device is used to sleeved the outer rotor on the outer peripheral side of the inner rotor, press the cover plate onto the inner rotor and the outer rotor, and align the mounting holes of the cover plate, the mounting holes of the outer rotor, and the threaded holes of the timing drive wheel; and A first jaw and a second jaw symmetrically arranged and connected to the fixed frame. The central axes of the first jaw and the second jaw are eccentrically arranged with respect to the central axis of the positioning shaft. The first jaw and the second jaw are used to clamp the timing drive wheel to move in the eccentric direction, so as to control the phase of the radial runout of the phaser in a preset direction.

2. The assembly tooling according to claim 1, characterized in that, The first jaw and the second jaw are rotatably connected to the fixed frame and are used to clamp the timing drive wheel in a preset angular direction and move it in the eccentric direction.

3. The assembly tooling according to claim 1, wherein The first jaw and the second jaw are fixedly connected to the fixed frame. The second shaft section is provided with two positioning pin holes, and the two positioning pin holes are distributed at a preset angular interval in the circumferential direction. The two positioning pin holes are respectively used to cooperate with the pin shafts on the inner rotors of the intake phaser and the exhaust phaser.

4. The assembly tooling according to claim 1, wherein The coaxiality error between the first shaft section and the second shaft section is 0 - 0.003 mm; and / or, the coaxiality error between the positioning device and the positioning shaft is 0 - 0.003 mm.

5. An assembly method for an engine variable valve timing system, which is assembled by using the assembly tooling for the engine variable valve timing system according to any one of claims 1 to 4, characterized in that The assembly method includes: Calculating the phase difference between the radial runout of the intake phaser and the radial runout of the exhaust phaser; Moving the intake timing drive wheel of the intake phaser in the eccentric direction of the positioning shaft through the assembly tooling to control the phase of the radial runout of the intake phaser in a first direction; Moving the exhaust timing drive wheel of the exhaust phaser in the eccentric direction of the positioning shaft through the assembly tooling to control the phase of the radial runout of the exhaust phaser in a second direction, wherein the angular difference between the first direction and the second direction is the phase difference; Assembling the intake timing drive wheel, the exhaust timing drive wheel, and the transmission parts to the engine according to the timing marks.

6. The assembly method according to claim 5, wherein The calculating the phase difference between the radial runout of the intake phaser and the radial runout of the exhaust phaser includes: Calculating that when the running length of the transmission part is the center distance L between the intake camshaft and the exhaust camshaft, the angle a = 360 * L / S rotated by any one of the intake timing drive wheel and the exhaust timing drive wheel, where S is the pitch circle circumference of any one of the intake timing drive wheel and the exhaust timing drive wheel; Along the rotation direction of the transmission member, the phase difference between the radial runout of any one of the intake timing drive wheel and the exhaust timing drive wheel and the radial runout of the other is b = 180° - a.

7. The assembly method according to claim 5, characterized in that, The first jaw and the second jaw are rotatably connected to the fixed bracket; the step of moving the intake timing drive wheel of the intake phaser in the eccentric direction of the positioning shaft through the assembly tooling to control the phase of the radial runout of the intake phaser in the first direction includes: Sleeving the intake timing drive wheel on the end face of the third shaft section of the positioning shaft of the assembly tooling; Sleeving the inner rotor of the intake phaser on the second shaft section of the positioning shaft, and inserting the positioning pin on the inner rotor into the positioning pin hole on the second shaft section; Taking the inner rotor as a reference, sleeving the outer rotor of the intake phaser on the inner rotor through the positioning device of the assembly tooling, and rotating the intake timing drive wheel to make the mounting hole of the outer rotor correspond to the threaded hole of the intake timing drive wheel; Placing the cover plate of the intake phaser on the inner rotor and the outer rotor through the positioning device, and sequentially passing the connecting bolts through the mounting holes of the cover plate, the mounting holes of the outer rotor and the threaded holes of the intake timing drive wheel; Controlling the first jaw and the second jaw of the assembly tooling to clamp the intake timing drive wheel so that the intake timing drive wheel moves in the eccentric direction; Tightening the connecting bolts.

8. The assembly method according to claim 7, wherein The step of moving the exhaust timing drive wheel of the exhaust phaser in the eccentric direction of the positioning shaft through the assembly tooling to control the phase of the radial runout of the exhaust phaser in the second direction includes: Sleeving the exhaust timing drive wheel on the end face of the third shaft section of the positioning shaft of the assembly tooling; Sleeving the inner rotor of the exhaust phaser on the second shaft section of the positioning shaft, and inserting the positioning pin on the inner rotor into the positioning pin hole on the second shaft section; Controlling the first jaw and the second jaw of the assembly tooling to rotate a preset angle, and the preset angle is the phase difference; Taking the inner rotor as a reference, sleeving the outer rotor of the exhaust phaser on the inner rotor through the positioning device, and rotating the exhaust timing drive wheel to make the mounting hole of the outer rotor correspond to the threaded hole of the exhaust timing drive wheel; Placing the cover plate of the exhaust phaser on the inner rotor and the outer rotor through the positioning device, and sequentially passing the connecting bolts through the mounting holes of the cover plate, the mounting holes of the outer rotor and the threaded holes of the exhaust timing drive wheel; Controlling the first jaw and the second jaw of the assembly tooling to clamp the exhaust timing drive wheel along the preset angle direction so that the exhaust timing drive wheel moves in the eccentric direction; Tightening the connecting bolts.

9. The assembly method according to claim 5, characterized in that, The first jaw and the second jaw are fixedly connected to the fixing bracket. Two positioning pin holes are provided on the second shaft section, and the two positioning pin holes are spaced apart at a preset angle in the circumferential direction. The preset angle is the phase difference. The step of controlling the phase of the radial runout of the intake phaser in the first direction by moving the intake timing drive wheel of the intake phaser in the eccentric direction of the positioning shaft through the assembly tooling includes: Sleeving the intake timing drive wheel on the end face of the third shaft section of the positioning shaft of the assembly tooling; Sleeving the inner rotor of the intake phaser on the second shaft section of the positioning shaft, and inserting the positioning pin on the inner rotor into one of the positioning pin holes on the second shaft section; Taking the inner rotor as a reference, sleeving the outer rotor of the intake phaser on the inner rotor through the positioning device of the assembly tooling, and rotating the intake timing drive wheel to make the mounting hole of the outer rotor correspond to the threaded hole of the intake timing drive wheel; Placing the cover plate of the intake phaser on the inner rotor and the outer rotor through the positioning device, and sequentially passing the connecting bolts through the mounting holes of the cover plate, the mounting holes of the outer rotor and the threaded holes of the intake timing drive wheel; Controlling the first jaw and the second jaw of the assembly tooling to clamp the intake timing drive wheel so that the intake timing drive wheel moves in the eccentric direction; Tightening the connecting bolts.

10. The assembly method according to claim 9, characterized in that, The step of controlling the phase of the radial runout of the exhaust phaser in the second direction by moving the exhaust timing drive wheel of the exhaust phaser in the eccentric direction of the positioning shaft through the assembly tooling includes: Sleeving the exhaust timing drive wheel on the end face of the third shaft section of the positioning shaft of the assembly tooling; Sleeving the inner rotor of the exhaust phaser on the second shaft section of the positioning shaft, and inserting the positioning pin on the inner rotor into the other positioning pin hole on the second shaft section; Taking the inner rotor as a reference, sleeving the outer rotor of the exhaust phaser on the inner rotor through the positioning device, and rotating the exhaust timing drive wheel to make the mounting hole of the outer rotor correspond to the threaded hole of the exhaust timing drive wheel; Placing the cover plate of the exhaust phaser on the inner rotor and the outer rotor through the positioning device, and sequentially passing the connecting bolts through the mounting holes of the cover plate, the mounting holes of the outer rotor and the threaded holes of the exhaust timing drive wheel; Controlling the first jaw and the second jaw of the assembly tooling to clamp the exhaust timing drive wheel so that the exhaust timing drive wheel moves in the eccentric direction; Tightening the connecting bolts.

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