Centrally mounted intermediate locking phaser

Abstract

This invention relates to a centrally located intermediate locking phaser, belonging to the technical field of engines. The centrally located intermediate locking phaser of this invention includes a sprocket, a locking pin seat, a stator, a rotor, a locking pin assembly, a one-way valve assembly, a front cover, and a planar helical return spring. The sprocket is provided with a sprocket groove and a sprocket pin hole groove. The first blade of the rotor is provided with a locking pin hole, a left-stepped one-way valve hole, a right-stepped one-way valve hole, and their mating structures, expanding the range of VVT (Vehicle Dynamics Transmission Unit) for large-angle control. Furthermore, the initial VVT position is set in the middle of the condition range, allowing for rapid response to adjustments in both advance and lag directions. This solves the phase requirements for compatibility with cold starts and the Atkinson cycle, while also achieving the lag phase required by the Atkinson cycle relatively quickly.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and more particularly to a centrally mounted intermediate locking phaser of a variable valve timing system. Background Art

[0002] When the engine is at high speed, more air is needed, but the intake valve may be closed before the required air is fully entered, resulting in reduced performance, so the timing of valve opening and closing is very important. Continuously open valves will cause fuel to be discharged from the engine without being burned, which will reduce engine performance and increase exhaust pollution, so the engine idle speed cannot be too low. The crankshaft drives the camshaft through a timing belt, gear or chain. The profile and position of the cam on the camshaft are usually optimized for a specific engine speed, which usually reduces the engine's torque at low speeds and power at high speeds. VVT technology enables it to change according to the engine operating conditions, improving the engine's efficiency and power.

[0003] The principle of variable valve timing (VVT) is to adjust the amount of intake or exhaust and the valve opening and closing time and angle according to the operating conditions of the engine, so as to optimize the amount of air entering, improve the combustion efficiency of the engine, improve its power and economy. VVT technology not only enables the engine to have better torque transmission characteristics and lower fuel consumption under partial load, but also can significantly improve the comprehensive performance of the engine at high and low speeds, high and low loads. The variable valve cam phaser is the most commonly used component in VVT technology.

[0004] Chinese invention patent CN106150587B discloses a centrally mounted variable valve timing device, wherein the phaser comprises a stator, a rotor, and a cover plate, wherein the stator, the rotor and the cover plate cooperate to form more than two sealed chambers, the rotor is provided with a sealing arm, and the sealing avoidance arm evenly divides the corresponding sealed chamber into an advance chamber and a retard chamber, the rotor is provided with two locking pins, and the cover plate is formed with two arc grooves, and the two locking members abut against the adjacent ends of the two arc grooves; it has the advantages of simple structure, convenient use, double locking function, centrally mounted oil control valve, fast adjustment response speed, small oil pressure loss, and high fuel economy; however, the phaser reset action responds slowly, and the matching part of the rotor and the stator is prone to wear under unfavorable working conditions.

[0005] The Chinese invention patent application publication CN106703925A discloses a high-precision rotor for automobile VVT, and the Chinese invention patent CN105234411B discloses an engine VVT ​​powder metallurgy phaser rotor made of aluminum alloy; although it can improve production efficiency and reduce costs, its high temperature resistance is still insufficient, and the adjustment accuracy may deteriorate under long-term use conditions. Moreover, with the increasing market competition in the automotive industry, most of the mainstream passenger car manufacturing industries have achieved or are developing engines with a thermal efficiency of more than 40%. In order to achieve this thermal efficiency target, most of them use Atkinson cycle technology. The Atkinson cycle requires the intake valve to close significantly later, and the late closing of the intake valve is not conducive to the cold start of the engine. The VVT ​​phaser in the prior art cannot be compatible with the phase requirements of cold start and Atkinson cycle at the same time; limited by the existing structure, the VVT ​​in the prior art takes a long time to adjust from the most advanced position to the most retarded position, and the transient accuracy is difficult to guarantee; as a result, the existing VVT phaser is difficult to fully meet the requirements of Atkinson cycle for phase adjustment. Summary of the invention

[0006] In order to solve the above problems in the existing clinical technology, the object of the present invention is to provide a centrally mounted intermediate locking phaser.

[0007] The centrally mounted intermediate locking phaser of the present invention comprises a sprocket, a locking pin seat, a stator, a rotor, a front cover and a planar spiral structure return spring; the characteristics are as follows: the sprocket has a disc-shaped sprocket body, a non-through sprocket groove is arranged on the sprocket body, and a non-through sprocket pin hole groove is arranged on the inner side of the sprocket groove; the rotor is coaxially arranged in the stator; the stator comprises a stator cylinder, and three stator bosses are arranged on the inner side of the stator cylinder; the locking pin seat is arranged in the sprocket pin hole groove of the sprocket; the rotor comprises a rotor body and a first blade, a second blade and a third blade arranged on the outer side of the rotor body; the first blade, the second blade and the third blade are respectively connected to the adjacent stator bosses An advance chamber and a retardation chamber are formed between the platforms; a camshaft bolt hole is provided at the center of the rotor, and a first annular groove, a second annular groove and a third annular groove are provided in the camshaft bolt hole; the second annular groove is connected to the retardation chamber through the retardation chamber side oil hole, the third annular groove is connected to the advance chamber through the advance chamber side oil hole, and the first annular groove is connected to the sprocket pin hole groove through the rotor unlocking oil inlet hole; a left groove and a right groove are symmetrically provided on both sides of the first blade, a left groove side hole is provided in the left groove, and a right groove side hole is provided in the right groove, and a lock pin circular hole parallel to the axial direction, a left stepped one-way valve hole and a right stepped one-way valve hole are also provided on the first blade.

[0008] Wherein, the left stepped one-way valve hole and the right stepped one-way valve hole are symmetrically or asymmetrically arranged on both sides of the locking pin circular hole, the outer side of the left stepped one-way valve hole is provided with a left stepped one-way valve hole side groove, and the left stepped one-way valve hole side groove is connected with the left stepped one-way valve hole; the outer side of the right stepped one-way valve hole is provided with a right stepped one-way valve hole side groove, and the right stepped one-way valve hole side groove is connected with the right stepped one-way valve hole; the left groove side hole passes through the locking pin circular hole, and the right groove side hole passes through the locking pin circular hole; one-way valve assemblies are arranged in the left stepped one-way valve hole and the right stepped one-way valve hole, and a locking pin assembly is arranged in the locking pin circular hole; when the phaser is in the initial position, the locking pin circular hole is directly opposite to the sprocket pin hole groove.

[0009] The front cover is arranged at the front end of the rotor, and the sprocket is arranged at the rear end of the rotor. The sprocket, the stator and the front cover are connected by fasteners.

[0010] Wherein, the planar spiral structure return spring is arranged at the upper end surface of the front cover, the planar spiral structure has an outer ring and an inner ring, and the outer ring and the inner ring are limitedly supported by a positioning rod.

[0011] Wherein, the one-way valve assembly is composed of a one-way valve plate, a one-way valve spring and a one-way valve base; the one-way valve base has a stepped seat with a cylindrical structure, and the one-way valve spring is sleeved on the cylindrical structure of the one-way valve base.

[0012] Among them, the one-way valve plate is close to the rear ends of the left stepped one-way valve hole and the right stepped one-way valve hole, the one-way valve base is close to the front ends of the left stepped one-way valve hole and the right stepped one-way valve hole, and the one-way valve spring is arranged between the one-way valve plate and the one-way valve base.

[0013] Wherein, the locking pin assembly consists of a locking pin, a locking spring and a locking spring seat.

[0014] Among them, the locking pin is in the form of an elongated cylindrical structure, and a ring-shaped concave structure is provided in the middle of the elongated cylindrical structure; the locking spring is arranged between the groove at the front end of the locking pin and the locking spring seat.

[0015] Wherein, an axial circular hole is arranged at the center of the sprocket body, gear teeth are arranged at the outer ring of the sprocket body, and a plurality of axial threaded holes are arranged on the sprocket body.

[0016] Wherein, bolt holes are respectively arranged on the three stator bosses.

[0017] Among them, the front cover is a disc-shaped structure, the inner center of the front cover is provided with an axial special-shaped hole and the front cover is provided with a plurality of axial conical threaded countersunk holes, screws pass through the axial conical threaded countersunk holes, bolt holes and threaded holes to screw and fix the front cover, stator and sprocket; the edge of the front cover is provided with an axially penetrating long groove or hole structure, the first positioning rod passes through the long groove or hole structure and is riveted and fixed to the stator, so as to limit the outer ring of the planar spiral structure reset spring.

[0018] The second positioning rod and the third positioning rod pass through the central through hole of the front cover and are fixedly connected to the rotor by riveting, so as to limit and support the inner ring of the planar helical structure return spring.

[0019] Wherein, the locking pin seat is a metal bushing, and the locking pin seat is fixedly connected to the sprocket by riveting; the locking pin seat is quenched and is a circular ring structure, and the interior of the circular ring structure has an elliptical center.

[0020] Wherein, the sprocket groove is a C-shaped groove.

[0021] Wherein, the sprocket and the stator are an integrated structure.

[0022] Compared with the prior art, the centrally mounted intermediate locking phaser of the present invention has the following beneficial effects: The advance cavity and the retard cavity of the phaser of the present invention can be adjusted in both directions, which expands the range of large-angle control that VVT can achieve, and the initial position of VVT is set in the middle of the condition range, and the adjustment in both the advance and retard directions can respond quickly; it solves the phase requirements of compatibility with cold start and Atkinson cycle, and at the same time can also relatively quickly reach the lag phase required by the Atkinson cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an assembly structure diagram of the centrally mounted intermediate locking phaser of the present invention; Figure 2 It is an exploded structural diagram of the centrally mounted intermediate locking phaser of the present invention; Figure 3 It is a schematic diagram of the rotor structure in the center-mounted intermediate locking phaser of the present invention; Figure 4 It is a cross-sectional structural diagram of a center-mounted intermediate locking phaser of the present invention; Figure 5 It is a perspective view of a center-mounted intermediate locking phaser of the present invention.

[0024] The meanings of the reference numerals in the figures are: 10-sprocket, 11-sprocket body, 12-sprocket groove, 13-sprocket pin hole groove; 20-locking pin seat; 30-stator, 31-stator cylinder, 32-stator boss, 33-advance chamber, 34-advance chamber side oil hole, 35-retardation chamber, 36-retardation chamber side oil hole, 37-stator bolt through hole; 40-locking pin assembly, 41-locking pin, 42-locking spring, 43-locking spring seat; 50-check valve assembly, 51-check valve plate, 52-check valve spring, 53-check valve base; 60-front cover; 70-planar spiral structure reset spring; 80-rotor, 81-first blade, 82-second blade, 83-third blade, 84-left groove, 85-left groove side hole, 86-lock pin circular hole, 87-right groove side hole, 88-right groove, 89-left stepped one-way valve hole, 90-right stepped one-way valve hole, 91-left stepped one-way valve hole side groove, 92-right stepped one-way valve hole side groove, 93-camshaft bolt hole, 95-rotor unlocking oil inlet hole, 96-first annular groove, 97-second annular groove, 98-third annular groove, 101-first positioning rod, 102-second positioning rod, 103-third positioning rod, 105-screw. DETAILED DESCRIPTION

[0025] The centrally mounted intermediate locking phaser of the present invention will be further described below in conjunction with specific embodiments to help those skilled in the art to have a more complete, accurate and in-depth understanding of the technical solution of the present invention.

[0026] like Figure 1-5As shown, the central intermediate locking phaser of this embodiment includes a sprocket 10, a locking pin seat 20, a stator 30, a rotor 80, a locking pin assembly 40, a one-way valve assembly 50, a front cover 60, a planar spiral structure return spring 70, a first positioning rod 101, a second positioning rod 102, a third positioning rod 103 and a screw 105. The sprocket 10 has a disc-shaped sprocket body 11, the center of the sprocket body 11 is provided with an axial circular hole, the outer ring of the sprocket body 11 is provided with gear teeth, the sprocket body 11 is provided with a plurality of axial threaded holes, and the sprocket body 11 is provided with a non-through sprocket groove 12, preferably a C-shaped groove, and the inner side of the sprocket groove is provided with a non-through sprocket pin hole groove 13. The rotor 80 is coaxially arranged in the stator 30, the front cover 60 is arranged at the front end of the rotor 80, and the sprocket 10 is arranged at the rear end of the rotor 80. The planar helical structure reset spring 70 is arranged at the upper end surface of the front cover 60 and has a planar helical structure. The planar helical structure has an outer ring and an inner ring, and the outer ring and the inner ring are limited and supported by positioning rods (the first positioning rod 101 passes through the through groove on the outer side of the front cover 60 and cooperates with the stator 30, which is used to limit and support the outer ring of the planar helical structure reset spring 70; the second positioning rod 102 and the third positioning rod 103 pass through the front cover 60 and cooperate with the rotor 80, which are used to limit and support the inner ring of the planar helical structure reset spring 70). The stator 30 includes a stator cylinder 31, and three stator bosses are arranged on the inner side of the stator cylinder 31. Bolt through holes are respectively arranged on the three stator bosses. The sprocket 10, the stator 30 and the front cover 60 are positioned by positioning pins and connected by fasteners. In this embodiment, the fasteners are 3 screws 105. Specifically, the front cover 60 is a disc-shaped structure, the inner center of the front cover 60 is provided with an axial special-shaped hole and the front cover 60 is provided with a plurality of axial tapered threaded countersunk holes, and the screw 105 passes through the axial tapered threaded countersunk hole, the bolt through hole and the threaded hole of the sprocket body 11 to be screwed and fixed to the sprocket 10. The locking pin seat 20 is arranged in the sprocket pin hole groove 13 of the sprocket 10, and the locking pin seat 20 is an annular structure, the inner part of the annular structure has an elliptical center, and the long diameter direction of the elliptical center points to the sprocket center. The locking pin seat is a metal bushing, which is fixedly connected to the sprocket by riveting. In order to ensure strength and avoid wear, the locking pin seat must be quenched.

[0027] The rotor 80 includes a rotor body and a first blade 81, a second blade 82 and a third blade 83 arranged outside the rotor body; the first blade 81, the second blade 82 and the third blade 83 respectively form an advance chamber 33 and a retard chamber 35 with adjacent bosses (see Figure 5 ), Figure 5Only the first blade 81 and the adjacent boss form an advance chamber 33 and a retard chamber 35, as shown in Figure 5, the second blade and the third blade also form an advance chamber 33 and a retard chamber 35 with the adjacent boss. The volume of the first blade is larger than that of the second blade 82 and the third blade 83. Figure 3-5 As shown, a camshaft bolt hole 93 is provided at the center of the rotor 80, and the camshaft bolt hole 93 is used to connect to the camshaft and is provided with a first annular groove 96, a second annular groove 97 and a third annular groove 98. The second annular groove 97 is communicated with the retardation chamber 35 through the retardation chamber side oil hole 36, and the third annular groove 98 is communicated with the advance chamber 33 through the advance chamber side oil hole 34. The first annular groove 96 is communicated with the sprocket pin hole groove 13 through the rotor unlocking oil inlet hole 95. The first blade 81 is symmetrically provided with a left groove 84 and a right groove 88 on both sides, the left groove 84 is provided with a left groove side hole 85, the right groove 88 is provided with a right groove side hole 87, the first blade is also provided with a locking pin circular hole 86 parallel to the axial direction, a left stepped check valve hole 89 and a right stepped check valve hole 90, the left stepped check valve hole 89 and the right stepped check valve hole 90 are symmetrically provided on both sides of the locking pin circular hole 86, the left stepped check valve hole 89 is provided with a left stepped check valve hole side groove 91 on the outside, and the left stepped check valve hole side groove 91 is communicated with the left stepped check valve hole 89. The right stepped check valve hole 90 is provided with a right stepped check valve hole side groove 92 on the outside, and the right stepped check valve hole side groove 92 is communicated with the right stepped check valve hole 90. The left groove side hole 85 passes through the locking pin circular hole 86 , and the right groove side hole 87 passes through the locking pin circular hole 86 .

[0028] The one-way valve assembly 50 is composed of a one-way valve disc 51, a one-way valve spring 52 and a one-way valve base 53. The one-way valve base 53 has a cylindrical step seat, and the one-way valve spring 52 is sleeved on the cylindrical structure of the one-way valve base 53. The one-way valve assembly 50 is two and is respectively arranged in the left stepped one-way valve hole 89 and the right stepped one-way valve hole 90. The one-way valve disc 51 is close to the rear end of the left stepped one-way valve hole 89 and the right stepped one-way valve hole 90, and the one-way valve base 53 is close to the front end of the left stepped one-way valve hole 89 and the right stepped one-way valve hole 90. The one-way valve spring 52 is arranged between the one-way valve disc 51 and the one-way valve base 53.

[0029] The locking pin assembly 40 is composed of a locking pin 41, a locking spring 42 and a locking spring seat 43. The locking pin 41 is arranged in the locking pin circular hole 86. The locking pin 41 is a long cylindrical structure, and the middle of the long cylindrical structure has a ring-shaped concave structure. The locking spring 42 is arranged between the groove at the front end of the locking pin 41 and the locking spring seat 43. When the phaser is in the initial position, the locking pin circular hole 86 is opposite to the sprocket pin hole groove 13.

[0030] In the present invention, the designed rotor is an aluminum alloy powder sintered part that can be processed and formed by a powder metallurgy process. The element composition of the aluminum alloy is: 3.60-3.90wt% Cu, 1.15-1.35wt% Li, 0.25-0.50wt% Mn, 0.01-0.10wt% Nb, 0.10-0.15wt% Zr, 0.03-0.10wt% Ti, and the balance is Al and inevitable impurities, and the inevitable impurity content is more than 1.0wt%. The aluminum alloy powder sintered part is mixed according to the above-mentioned element composition, and 1.0% polyamide and 0.5% paraffin are added to the total amount of aluminum alloy raw materials and mixed evenly; then, a green body is obtained by warm pressing at 130°C and a molding pressure of 120-180MPa, and then sintered at 600-610°C for 60min in an inert gas atmosphere, sandblasted after sintering, and subjected to secondary solution treatment, kept at 480-500°C for 1h, kept at 520-540°C for 2h, and finally aged at 150-160°C for 30 hours. The aluminum alloy powder sintered part has a tensile strength of 420-450MPa, an HRB hardness of more than 78, and excellent mechanical properties.

[0031] For the centrally mounted intermediate locking phaser of the present invention, when the engine ECU gives an unlocking action signal, the oil pressure flows through the first annular groove 96 of the camshaft bolt hole 93 on the rotor 80, flows to the rotor unlocking oil inlet hole 95, enters the sprocket pin hole groove 13, and generates oil pressure at the bottom of the locking pin, and the locking pin overcomes the locking spring and lifts upward to complete the unlocking function. At this time, the oil in the phaser advance chamber 33 and the retard chamber 35 cannot be discharged through the oil control valve, and the engine phase does not change. When the engine ECU gives a phase advance action signal, the oil pressure flows through the third annular groove 98 of the rotor camshaft bolt hole 93 to the advance chamber side oil hole 34, enters the advance chamber 33, and the rotor 80 is affected by the oil pressure, and the phaser realizes the action toward the advance chamber. At this time, the retard chamber 35 is drained, and the oil flows to the valve sleeve oil drain hole, and the oil is then discharged from the bolt flange surface. When the engine ECU gives a phase stabilization action signal, the oil control valve controls the oil circuits of the advance chamber 33 and the retard chamber 35 to be closed, and the phase stabilizes the target value; when the engine ECU gives a phase retardation action signal, the oil pressure flows to the retardation chamber side oil hole 36 through the second annular groove 97 of the rotor camshaft bolt hole 93, and enters the retardation chamber 35. The rotor 80 is acted upon by the oil pressure, and the phaser moves toward the retardation chamber 35. At this time, the advance chamber 33 of the phaser is drained, the oil flows to the valve sleeve oil drain hole, and the oil is discharged from the bolt flange surface; when the engine is stopped and the phaser needs to be reset, the phaser has two situations: (1) When the phase is in the advance position, the rotor 80 is acted upon by the camshaft torque and is forced in the retardation direction. At this time, the oil in the phaser advance chamber 33 and the retard chamber 35 cannot be discharged through the oil control valve, so the oil flows from the advance chamber 33 through the sprocket groove 12 to the left groove 84 set on the outer side of the first blade 81 of the rotor 80, and flows to the lock pin circular hole 86, lifting the one-way valve plate 51 of the one-way valve assembly 50 on the right side of the rotor 80, and the oil flows to the right stepped one-way valve hole side groove 92, and then flows to the retard chamber 35, so that the rotor 80 moves in the retardation direction, thereby achieving the engine shutdown lock pin reset. (2) When the phase is in the retarded position, the oil in the phaser advance chamber 33 and the retarded chamber 35 cannot be discharged through the oil control valve. The rotor 80 is subjected to the spring torsion force and is forced in the advance direction. The oil in the retarded chamber 35 flows through the sprocket groove 12 to the lock pin circular hole 86, lifting the one-way valve plate 51 of the one-way valve assembly 50 on the left side of the rotor 80. The oil flows to the left stepped one-way valve hole side groove 91, and then flows to the advance chamber 33, realizing the movement of the rotor 80 in the advance direction, thereby achieving the reset of the engine shutdown lock pin.

[0032] In addition to the oil circuits of the advance chamber 33 and the retard chamber 35, the centrally mounted intermediate locking phaser of the present invention has an additional oil circuit for actively controlling unlocking or locking through the design and improvement of the sprocket 10 and the rotor 80; at the same time, through the internal circulation function of the oil circuit, the rotor 80 can be quickly locked to the intermediate initial position after being adjusted to any phase. The phaser of the present invention can be adjusted in both the advance chamber 33 and the retard chamber 35, expanding the range of large-angle control that VVT can achieve, and the initial position of VVT is set in the middle of the condition range, and the adjustment in both the advance and retard directions can respond quickly; it solves the phase requirements of being compatible with cold start and Atkinson cycle, and can also relatively quickly reach the retard phase required by the Atkinson cycle.

[0033] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concepts and technical solutions of the present invention, or the concepts and technical solutions of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A centrally mounted intermediate locking phaser, comprising a sprocket, a locking pin seat, a stator, a rotor, a front cover and a planar spiral structure return spring; characterized in that: The sprocket has a disc-shaped sprocket body, a non-through sprocket groove is provided on the sprocket body, and a non-through sprocket pin hole groove is provided on the inner side of the sprocket groove; the rotor is coaxially arranged in the stator; the stator includes a stator cylinder, and three stator bosses are provided on the inner side of the stator cylinder; the locking pin seat is arranged in the sprocket pin hole groove of the sprocket; the rotor includes a rotor body and a first blade, a second blade and a third blade arranged on the outer side of the rotor body; the first blade, the second blade and the third blade respectively form an advance chamber and a lag chamber with adjacent stator bosses; the center of the rotor is provided with a convex The wheel shaft bolt hole, the camshaft bolt hole is provided with a first annular groove, a second annular groove and a third annular groove; the second annular groove is connected with the retardation chamber through the retardation chamber side oil hole, the third annular groove is connected with the advance chamber through the advance chamber side oil hole, the first annular groove is connected with the sprocket pin hole groove through the rotor unlocking oil inlet hole; the first blade is symmetrically provided with a left groove and a right groove on both sides, the left groove is provided with a left groove side hole, the right groove is provided with a right groove side hole, and the first blade is also provided with a locking pin circular hole parallel to the axial direction, a left stepped one-way valve hole and a right stepped one-way valve hole.

2. The centrally mounted intermediate locking phaser according to claim 1, characterized in that: The left stepped one-way valve hole and the right stepped one-way valve hole are symmetrically or asymmetrically arranged on both sides of the locking pin circular hole, and a left stepped one-way valve hole side groove is arranged on the outer side of the left stepped one-way valve hole, and the left stepped one-way valve hole side groove is communicated with the left stepped one-way valve hole; a right stepped one-way valve hole side groove is arranged on the outer side of the right stepped one-way valve hole, and the right stepped one-way valve hole side groove is communicated with the right stepped one-way valve hole; the left groove side hole passes through the locking pin circular hole, and the right groove side hole passes through the locking pin circular hole; a one-way valve assembly is arranged in the left stepped one-way valve hole and the right stepped one-way valve hole, and a locking pin assembly is arranged in the locking pin circular hole; when the phaser is in the initial position, the locking pin circular hole is directly opposite to the sprocket pin hole groove.

3. The centrally mounted intermediate locking phaser according to claim 2, characterized in that: The front cover is arranged at the front end of the rotor, the sprocket is arranged at the rear end of the rotor, and the sprocket, the stator and the front cover are connected by fasteners.

4. The centrally mounted intermediate locking phaser according to claim 3, characterized in that: The planar spiral structure return spring is arranged at the upper end surface of the front cover, the planar spiral structure has an outer ring and an inner ring, and the outer ring and the inner ring are limitedly supported by a positioning rod.

5. The centrally mounted intermediate locking phaser according to claim 2, characterized in that: The one-way valve assembly is composed of a one-way valve plate, a one-way valve spring and a one-way valve base; the one-way valve base has a stepped seat with a cylindrical structure, and the one-way valve spring is sleeved on the cylindrical structure of the one-way valve base.

6. The centrally mounted intermediate locking phaser according to claim 5, characterized in that: The one-way valve plate is close to the rear ends of the left stepped one-way valve hole and the right stepped one-way valve hole, the one-way valve base is close to the front ends of the left stepped one-way valve hole and the right stepped one-way valve hole, and the one-way valve spring is arranged between the one-way valve plate and the one-way valve base.

7. The centrally mounted intermediate locking phaser according to claim 2, characterized in that: The locking pin assembly consists of a locking pin, a locking spring and a locking spring seat.

8. The centrally mounted intermediate locking phaser according to claim 7, characterized in that: The locking pin is in the form of an elongated cylindrical structure, and a ring-shaped concave structure is provided in the middle of the elongated cylindrical structure; the locking spring is arranged between the groove at the front end of the locking pin and the locking spring seat.

9. The centrally mounted intermediate locking phase shifter according to any one of claims 1 to 8, characterized in that: The center of the sprocket body is provided with an axial circular hole, the outer ring of the sprocket body is provided with gear teeth, and the sprocket body is provided with a plurality of axial threaded holes.

10. The centrally mounted intermediate locking phaser according to claim 9, characterized in that: The three stator bosses are respectively provided with bolt through holes.

11. The centrally mounted intermediate locking phaser according to claim 10, characterized in that: The front cover is a disc-shaped structure, an axial special-shaped hole is provided at the inner center of the front cover and a plurality of axial conical threaded countersunk holes are provided on the front cover, screws pass through the axial conical threaded countersunk holes, bolt holes and threaded holes to screw and fix the front cover, stator and sprocket; an axially penetrating long groove or hole structure is provided at the edge of the front cover, a first positioning rod passes through the long groove or hole structure and is riveted and fixed to the stator, so as to limit the outer ring of the planar spiral structure reset spring.

12. The centrally mounted intermediate locking phaser according to claim 8, characterized in that: The second positioning rod and the third positioning rod pass through the central through hole of the front cover and are fixedly connected to the rotor by riveting, and are used to limit and support the inner ring of the planar helical structure return spring.

13. The centrally mounted intermediate locking phaser according to claim 1, characterized in that: The locking pin seat is a metal bushing, and the locking pin seat is fixedly connected to the sprocket by riveting; the locking pin seat is quenched and is a circular ring structure, and the interior of the circular ring structure has an elliptical center.

14. The centrally mounted intermediate locking phaser according to claim 1, characterized in that: The sprocket groove is a C-shaped groove.

15. The centrally mounted intermediate locking phaser according to claim 1, characterized in that: The sprocket and the stator are an integrated structure.

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