A cam phase adjustment mechanism for medium and heavy-duty diesel engines

Abstract

This utility model relates to the field of variable valve timing technology, specifically a camshaft phase adjustment mechanism for medium and heavy-duty diesel engines. It includes a ring gear, a ring stator, a rotor, and a ring sealing plate coaxially arranged. The ring gear is fixedly connected to one axial side of the ring stator. The rotor is rotatably connected within the ring stator. An annular gasket groove is provided on the side of the rotor near the ring gear. An annular gasket for increasing the coefficient of friction is provided within the annular gasket groove. The annular sealing plate is fixedly connected to the other axial side of the ring stator, axially limiting the rotor between the annular sealing plate and the ring gear. The advantages of this utility model are that the overall structure is more compact, with stronger connectivity and reliability. The annular gasket increases the coefficient of friction between the camshaft and rotor mating surfaces, adapting to high torque requirements while ensuring structural stability and reliability.

Description

Technical Field

[0001] This utility model relates to the field of variable valve timing technology, and more specifically, to a cam phase adjustment mechanism for medium and heavy-duty diesel engines. Background Technology

[0002] To meet increasingly stringent environmental protection regulations, the development of medium and heavy-duty diesel engines may be a new trend and direction for variable valve timing technology. With the increasing global environmental protection requirements, the overall greenhouse gas and carbon dioxide emissions, as well as the need for fuel economy and the cost of using commercial trucks, most commercial vehicles are also facing the challenge of electrification. However, it is still expected that diesel engines (displacement of 6L to 20L) will remain dominant in the commercial vehicle sector in the medium term, with increased opportunities for alternative fuel applications and VCT (variable camshaft timing phaser, hereinafter referred to as phaser or VCT).

[0003] The main function of the valve timing device (VCT) is to adjust the valve timing of the engine, thereby improving the engine's power and economy at different speeds and reducing exhaust pollution. By adjusting the opening and closing time of the valves, the engine can obtain sufficient torque at low speeds and provide strong power at high speeds.

[0004] Current medium and heavy-duty diesel engines do not use phaser technology. Because diesel engines require higher reliability, longer service life, and harsher operating environments, the phasers used in traditional gasoline engines cannot be simply and directly replicated and used in diesel engines due to insufficient structural reliability. Utility Model Content

[0005] The present invention addresses the technical problem that the phaser structure of existing gasoline engines cannot be directly replicated and used in diesel engines. To overcome the shortcomings of the prior art, the present invention provides a more compact and convenient installation structure. By setting an annular gasket, the friction coefficient of the camshaft and rotor mating surface is increased, which can meet high torque requirements and improve the reliability and stability of the overall structure.

[0006] To achieve the objective of this utility model, the following technical solution is adopted:

[0007] A camshaft phase adjustment mechanism for medium and heavy-duty diesel engines includes a ring gear, a ring stator, a rotor, a ring sealing plate, a ring torsion spring, and a torsion spring support, all coaxially arranged. The ring gear is fixedly connected to one axial side of the ring stator. The rotor is rotatably connected within the ring stator. An annular gasket groove is provided on the side of the rotor near the ring gear. An annular gasket for increasing the coefficient of friction is provided within the annular gasket groove. The annular gasket is coaxially arranged with the rotor and axially limited between the rotor and the ring gear. The ring sealing plate is fixedly connected to the other axial side of the ring stator, further limiting the rotor axially between the annular sealing plate and the ring gear. This mechanism, with its fixed connection between the ring gear, ring stator, and annular sealing plate, is more compact, offering stronger connectivity and reliability. By installing an annular gasket between the annular sealing plate and the ring gear, the coefficient of friction at the camshaft and rotor contact surface is increased, adapting to high torque requirements and further ensuring its applicability to medium and heavy-duty diesel engines, while also ensuring structural stability and reliability.

[0008] Preferably, the annular gasket is made of diamond abrasive. The use of diamond abrasive increases overall strength and friction, and ensures a longer service life.

[0009] Preferably, three rotor blades are circumferentially spaced on the outer peripheral wall of the rotor; the three rotor blades include two small rotor blades and one large rotor blade; the inner peripheral wall of the annular stator is provided with three rotor movable cavities corresponding to the rotor blades; each rotor blade is installed in each rotor movable cavity; a sealing strip groove is provided on the outer peripheral wall of the small rotor blade; a sealing strip is provided in the sealing strip groove along the axial direction; the sealing strip abuts against the inner wall of the rotor movable cavity; and a movable gap is provided between the outer peripheral wall of the large rotor blade and the inner peripheral wall of the rotor movable cavity. The cam phase adjustment structure is located on the exhaust side of the engine. The exhaust side adjusts the phase through torsional vibration. By eliminating the original sealing strip on the rotor blades, the original three-chamber structure is transformed into a two-chamber structure. This connects the advance and lag chambers in the phaser on the exhaust side of the engine, enabling faster and more stable speed adjustment on the exhaust side. This improves the overall speed adjustment efficiency and stability of the structure. Furthermore, by simply eliminating the sealing strip on the rotor blades, more common parts can be maintained with the cam phase adjustment structure on the intake side of the engine. This allows for the sharing of the annular stator in the cam phase adjustment structure, ensuring structural and operational integrity. At the same time, it saves materials and costs, and facilitates parts production.

[0010] Preferably, the system also includes a ring torsion spring and a torsion spring bracket, the torsion spring bracket being detachably connected to the ring sealing plate; the ring torsion spring is sleeved on the torsion spring bracket, and the ring torsion spring is axially limited between the torsion spring bracket and the ring sealing plate; one end of the ring torsion spring is fixed to the torsion spring bracket, and the other end of the ring torsion spring is fixed to the ring sealing plate. The cooperation between the ring torsion spring and the torsion spring bracket facilitates the installation and replacement of the ring torsion spring.

[0011] Preferably, a circular mounting groove is provided on the side of the rotor away from the annular gear; a bracket limiting part is provided in the circular mounting groove; the bracket limiting part includes a first bracket limiting block and a second bracket limiting block arranged circumferentially; the first bracket limiting block and the second bracket limiting block are both radially arranged on the inner peripheral wall of the circular mounting groove; the torsion spring bracket includes a first annular disk and a second annular disk arranged coaxially, and the first annular disk is located axially outside the second annular disk and arranged parallel to it; the first annular disk and the second annular disk are fixedly connected by at least one connecting plate; a radially protruding annular disk protrusion is provided on the outer peripheral wall of the second annular disk; the annular disk protrusion is inserted into the circular mounting groove and located between the first bracket limiting block and the second bracket limiting block; a locking protrusion is provided on the inner peripheral wall of the annular sealing plate; when locked, the annular disk protrusion abuts against the bracket limiting block on one side and is located axially inside the locking protrusion to prevent the second annular disk from axially disengaging from the annular sealing plate. The above structure can achieve both locking and unlocking states by rotating the torsion spring bracket, which facilitates installation and disassembly and improves the convenience of replacing the ring torsion spring.

[0012] Preferably, the system also includes a torsion spring positioning ring; the outer peripheral wall of the torsion spring positioning ring has a positioning opening; the inner peripheral wall of the torsion spring positioning ring has a radially protruding torsion spring positioning protrusion that abuts against the connecting plate; the torsion spring positioning ring is sleeved on the torsion spring bracket and positioned by abutting against the connecting plate through the torsion spring positioning protrusion; the annular torsion spring is sleeved on the torsion spring positioning ring, with its inner end hooked at the positioning opening and its outer end hooked on the annular sealing plate; the torsion spring positioning ring abuts against the connecting plate under the force of the annular torsion spring. The positioning opening facilitates the hooking and fixing of one end of the annular torsion spring, and the torsion spring positioning ring abuts against the connecting plate under the action of the annular torsion spring, further facilitating the positioning and fixing of the torsion spring bracket, while also ensuring the reliability and connectivity of the overall structure.

[0013] Preferably, a positioning screw is axially arranged between the annular sealing plate and the annular stator; the inner end of the positioning screw passes through the annular sealing plate and connects to the annular stator, and the outer end of the positioning screw extends outside the annular sealing plate, hooking the outer end of the annular torsion spring onto the positioning screw. The positioning screw facilitates the positioning of the annular stator and the annular sealing plate, preventing misalignment or improper installation. It also allows the other end of the annular torsion spring to be hooked onto the positioning screw for fixation, improving the ease of assembly and disassembly of the annular torsion spring.

[0014] Preferably, the annular sealing plate, annular stator, and annular gear are provided with a number of screw connection holes, and are connected and fixed together by passing each connecting screw through the annular sealing plate, annular stator, and annular gear in sequence. The connecting screws facilitate the installation and connection of the three components, improve the overall coaxiality and connectivity, and ensure the reliability of the overall structure.

[0015] In summary, the advantages of this utility model are that the mechanism is more compact and has stronger connectivity and reliability due to the fixed connection between the ring gear, ring stator and ring sealing plate; by installing a ring gasket between the ring sealing plate and the ring gear, the friction coefficient of the camshaft and rotor mating surface is increased, which can meet the high torque requirements and further ensure that it can be used in medium and heavy-duty diesel engines; at the same time, the detachable installation method of the torsion spring bracket facilitates the installation and replacement of the ring torsion spring, and the detachable installation structure can also ensure the stability and reliability of the structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cam phase adjustment mechanism for medium and heavy-duty diesel engines according to this utility model.

[0017] Figure 2 This is a cross-sectional view of the phaser body in this utility model.

[0018] Figure 3 This is an exploded view of the front of the phaser body in this utility model.

[0019] Figure 4 This is an exploded view of the back of the phaser body in this utility model.

[0020] The components are as follows: 1. Ring gear; 2. Ring stator; 21. Rotor movable cavity; 3. Rotor; 30. Ring gasket groove; 300. Movable clearance; 301. Rotor small blade; 302. Rotor large blade; 303. Sealing strip groove; 304. Sealing strip; 305. Positioning pin; 306. Spring; 307. Plug; 31. Circular mounting groove; 32. First bracket limiting block; 33. First bracket limiting block; 4. Ring sealing plate; 41. Positioning screw; 5. Ring torsion spring; 6. Torsion spring bracket; 60. Locking protrusion; 61. First ring disc; 62. Second ring disc; 63. Connecting plate; 64. Ring disc protrusion; 7. Ring gasket; 8. Torsion spring positioning ring; 81. Positioning opening; 82. Torsion spring positioning protrusion; 10. Connecting screw. Detailed Implementation

[0021] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0022] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0023] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 4As shown, a cam phase adjustment phaser is respectively provided on the exhaust side and intake side of a medium- and heavy-duty diesel engine. A cam phase adjustment structure for a medium- and heavy-duty diesel engine, the structure of this application being used on the exhaust side of a medium- and heavy-duty diesel engine, includes a ring gear 1, a ring stator 2, a rotor 3, a ring sealing plate 4, a ring torsion spring 5, and a torsion spring support 6. The ring gear 1 abandons the traditional powder metallurgy sprocket and uses an integrally forged ring gear, achieving higher strength and hardness. The ring stator 2 and rotor 3 have higher strength than the phasers of ordinary gasoline engine models, using a higher density powder metallurgy material. The ring stator 2 is fixedly connected to the axial left side of the ring gear 1, and the rotor 3 is rotatably connected within the ring stator 2; an annular gasket groove 30 is provided on the axial right side of the rotor 3; an annular gasket 7 for increasing the coefficient of friction is provided in the annular gasket groove 30, the annular gasket 7 is coaxially arranged with the rotor 3, and the annular gasket 7 is axially limited between the rotor 3 and the ring gear 1. The annular gasket 7 is made of diamond abrasive material. The use of corundum material enhances overall strength and friction, ensuring a longer service life. The annular sealing plate 4 is fixedly connected to the axial left side of the annular stator 2, axially limiting the rotor 3 between the annular sealing plate 4 and the annular gear 1. Six screw connection holes are correspondingly provided on the annular sealing plate 4, annular stator 2, and annular gear 1, arranged in groups of two, with three groups evenly spaced circumferentially. Six connecting screws 10 are sequentially passed through the annular sealing plate 4, annular stator 2, and annular gear 1 to connect and fix them together. The connecting screws 10 facilitate the connection and installation of the three components, ensuring overall coaxiality and connectivity, while also ensuring the reliability of the overall structure. The torsion spring bracket 6 is detachably connected to the annular sealing plate 4. The annular torsion spring 5 is sleeved on the torsion spring bracket 6, axially limiting the annular torsion spring 5 between the torsion spring bracket 6 and the annular sealing plate 4. One end of the annular torsion spring 5 is fixed to the torsion spring bracket 6, and the other end is fixed to the annular sealing plate 4. The ring gear 1, ring stator 2, and ring sealing plate 4 are fixedly connected by connecting screws 10, making the overall structure more compact and improving connectivity and reliability. By installing an annular gasket 7 between the annular sealing plate 4 and the ring gear 1, the friction coefficient of the camshaft and rotor 3 mating surfaces is increased, adapting to high torque requirements and further ensuring its applicability to medium and heavy-duty diesel engines. At the same time, the detachable installation method of the torsion spring bracket 6 facilitates the installation and replacement of the annular torsion spring 5, and the detachable installation structure also ensures the stability and reliability of the structure.

[0026] like Figures 1 to 4As shown, three rotor blades are evenly spaced circumferentially on the outer peripheral wall of rotor 3. These three rotor blades include two small rotor blades 301 and one large rotor blade 302. Three rotor movable cavities 21, corresponding to the positions of the rotor blades, are provided on the inner peripheral wall of the annular stator 2. Each rotor blade is installed in each rotor movable cavity 21. A sealing groove 303 is provided on the outer peripheral wall of the small rotor blade 301. A sealing strip 304 is axially arranged within the sealing groove 303. The sealing strip 304 abuts against the inner wall of the rotor movable cavity 21, sealing the small rotor blade 301 with the interior of the annular stator 2. The sealing strip 304 is made of powder metallurgy instead of the original resin, making it suitable for harsh environments with higher torque and pressure. A movable gap 300 is provided between the outer peripheral wall of the large rotor blade 302 and the inner peripheral wall of the rotor movable cavity 21. By having the rotor blades rotate within the rotor active cavity 21, and by eliminating the sealing strip 304 on the large rotor blade 302, the original three-cavity structure is effectively transformed into a two-cavity structure. This connects the advance and lag cavities within the phaser on the exhaust side of the engine, enabling faster and more stable exhaust-side speed regulation and improving the overall speed regulation efficiency and stability. Furthermore, by simply eliminating the sealing strip 304 on the large rotor blade 302, more common parts can be maintained with the three-cavity structure in the phaser on the intake side of the engine, and the annular stator can be shared, ensuring structural and operational integrity while saving materials and costs, and facilitating parts production. The large rotor blade 302 has an axially threaded hole for mounting an idle speed assembly, which includes a coaxially arranged locating pin 305, spring 306, and screw plug 307. The locating pin 305 abuts against the ring gear 1 under the action of the spring 306, and the screw plug 307 abuts against the annular sealing plate 4 under the action of the spring 306. When the rotor 3 is in an idling state, the locating pin 305 keeps the rotor 3 in a designated position. The locating pin 305 is positioned in a locating hole on the ring gear 1. After the hydraulic chamber is driven by hydraulic pressure, the locating pin 305 can slide out from the designated position to ensure a stable idling effect.

[0027] like Figures 1 to 4As shown, a circular mounting groove 31 is provided on the left side wall of the rotor 3; two bracket limiting parts are provided on the circular mounting groove 31, and the two bracket limiting parts are spaced 180° apart. Each bracket limiting part includes a first bracket limiting block 32 and a second bracket limiting block 33 arranged circumferentially, and a sliding groove for the rotation of the torsion spring bracket 6 is formed between the first bracket limiting block 32 and the second bracket limiting block 33; the first bracket limiting block 32 and the second bracket limiting block 33 are both provided on the circumferential side wall of the circular mounting groove 31 and are radially toward the center of the rotor 3. The torsion spring bracket 6 includes a first annular disk 61 and a second annular disk 62 arranged coaxially; and the first annular disk 61 is located axially outside the second annular disk 62 and is arranged parallel to it. The size of the first annular disk 61 is larger than the size of the second annular disk 62; and two connecting plates 63 are provided between the first annular disk 61 and the second annular disk 62, the two connecting plates 63 are symmetrically arranged, and the first annular disk 61 and the second annular disk 62 are connected and fixed by the two connecting plates 63. Two symmetrically distributed annular disc protrusions 64 are provided on the outer peripheral wall of the second annular disc 62. The annular disc protrusions 64 protrude radially toward the center of the rotor 3 and face away from the center of the rotor 3. A locking protrusion 60 is provided on the inner peripheral wall of the annular sealing plate 4, and the locking protrusion 60 protrudes radially toward the center of the annular sealing plate 4. When locked, the annular disc protrusion 64 is inserted into the circular mounting groove 31 and located between the first bracket limiting block 32 and the second bracket limiting block 33. By rotating, the annular disc protrusion 64 can slide on the circular mounting groove 31, and finally the annular disc protrusion 64 on the torsion spring bracket 6 abuts against the bracket limiting block (the second bracket limiting block 33 in the figure) near the locking protrusion 60 and is located inside the locking protrusion 60, thereby preventing the second annular disc 62 from axially separating from the annular sealing plate 4, and locking the torsion spring bracket 6 between the annular sealing plate 4 and the rotor 3. The above structure can achieve both locking and unlocking states by rotating the torsion spring bracket 6, which facilitates installation and disassembly and improves the ease of replacing the annular torsion spring 5.

[0028] like Figure 3 and Figure 4As shown, it also includes a torsion spring positioning ring 8; a positioning opening 81 is provided on the outer peripheral wall of the torsion spring positioning ring 8; a torsion spring positioning protrusion 82 is provided on the inner peripheral wall of the torsion spring positioning ring 8, which protrudes radially and abuts against the connecting plate 63; the torsion spring positioning protrusion 82 protrudes radially toward the center of the torsion spring positioning ring 8. The torsion spring positioning ring 8 is sleeved on the torsion spring bracket 6, and the torsion spring positioning ring 8 is axially limited between the first annular disk 61 and the annular sealing plate 4; the torsion spring positioning ring 8 is positioned by abutting against the connecting plate 63 through the torsion spring positioning protrusion 82; an annular torsion spring 5 is sleeved on the torsion spring positioning ring 8, and the inner end of the annular torsion spring 5 is hooked at the positioning opening 81, and the outer end of the annular torsion spring 5 is hooked on the annular sealing plate 4; the torsion spring positioning ring 8 is pressed against the connecting plate 63 under the action of the annular torsion spring 5. The positioning opening 81 allows one end of the annular torsion spring 5 to be hooked and fixed. At the same time, under the action of the annular torsion spring 5, it can abut against the connecting plate 63 through the torsion spring positioning ring 8, which further facilitates the positioning and fixing of the torsion spring bracket 6, preventing and ensuring the reliability and connectivity of the overall structure.

[0029] like Figure 3 and Figure 4 As shown, a positioning screw 41 is also provided between the annular sealing plate 4 and the annular stator 2. The axial inner end of the positioning screw 41 passes through the annular sealing plate 4 and connects to the annular stator 2, while the outer end of the positioning screw 41 extends outside the annular sealing plate 4, fixing the outer end of the annular torsion spring 5 to the positioning screw 41. The positioning screw 41 facilitates the positioning of the annular stator 2 and the annular sealing plate 4, preventing misalignment or improper installation. It also allows the other end of the annular torsion spring 5 to be hooked onto the positioning screw 41 for fixation, improving the ease of installation and removal of the annular torsion spring 5.

[0030] In summary, the advantages of this utility model are that the mechanism is more compact and has stronger connectivity and reliability due to the fixed connection between the ring gear 1, the ring stator 2 and the ring sealing plate 4; by installing the ring gasket 7 between the ring sealing plate 4 and the ring gear 1, the friction coefficient of the camshaft and rotor 3 joint surface is increased, which can meet the high torque requirements and further ensure that it can be used in medium and heavy-duty diesel engines; at the same time, the detachable installation method of the torsion spring bracket 6 facilitates the installation and replacement of the ring torsion spring 5, and the detachable installation structure can also ensure the stability and reliability of the structure.

[0031] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0032] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0033] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cam phase adjustment mechanism for medium and heavy-duty diesel engines, characterized in that, The system includes a ring gear (1), a ring stator (2), a rotor (3), and a ring sealing plate (4) arranged coaxially. The ring gear (1) is fixedly connected to one axial side of the ring stator (2). The rotor (3) is rotatably connected inside the ring stator (2). An annular gasket groove (30) is provided on the side of the rotor (3) near the ring gear (1). An annular gasket (7) for increasing the coefficient of friction is provided in the annular gasket groove (30). The annular gasket (7) is coaxially arranged with the rotor (3) and is axially limited between the rotor (3) and the ring gear (1). The annular sealing plate (4) is fixedly connected to the other axial side of the ring stator (2) and axially limits the rotor (3) within the annular sealing plate (4). Between and the ring gear (1).

2. The cam phase adjustment mechanism for medium and heavy-duty diesel engines according to claim 1, characterized in that, The annular gasket (7) is made of diamond material.

3. The cam phase adjustment mechanism for medium and heavy-duty diesel engines according to claim 1, characterized in that, The rotor (3) Three rotor blades are arranged circumferentially on the outer peripheral wall of the annular stator (2); the three rotor blades include two small rotor blades (301) and one large rotor blade (302); the inner peripheral wall of the annular stator (2) is provided with three rotor movable cavities (21) corresponding to the rotor blades; each rotor blade is installed in each rotor movable cavity (21); a sealing strip groove (303) is provided on the outer peripheral wall of the small rotor blade (301); a sealing strip (304) is provided in the sealing strip groove (303) along the axial direction; the sealing strip (304) abuts against the inner wall of the rotor movable cavity (21); a movable gap (300) is provided between the outer peripheral wall of the large rotor blade (302) and the inner peripheral wall of the rotor movable cavity (21).

4. The cam phase adjustment mechanism for medium and heavy-duty diesel engines according to claim 1, characterized in that, It also includes an annular torsion spring (5) and a torsion spring bracket (6), the torsion spring bracket (6) being detachably connected to the annular sealing plate (4). Above; the annular torsion spring (5) is sleeved on the torsion spring bracket (6), and the annular torsion spring (5) is axially limited between the torsion spring bracket (6) and the annular sealing plate (4). One end of the annular torsion spring (5) is fixed on the torsion spring bracket (6), and the other end of the annular torsion spring (5) is fixed on the annular sealing plate (4).

5. The cam phase adjustment mechanism for medium and heavy-duty diesel engines according to claim 4, characterized in that, The rotor (3) A circular mounting groove (31) is provided on the side away from the ring gear (1); a bracket limiting part is provided in the circular mounting groove (31); the bracket limiting part includes a first bracket limiting block (32) and a second bracket limiting block (33) arranged circumferentially; the first bracket limiting block (32) and the second bracket limiting block (33) are both radially arranged on the inner peripheral wall of the circular mounting groove (31), and the torsion spring bracket (6) includes a first annular disk (61) arranged coaxially. The first annular disk (61) is located axially outside the second annular disk (62) and parallel to it; the first annular disk (61) and the second annular disk (62) are fixedly connected by at least one connecting plate (63); the outer peripheral wall of the second annular disk (62) is provided with a radially protruding annular disk protrusion (64); the annular disk protrusion (64) is inserted into the circular mounting groove (31) and located between the first bracket limiting block (32) and the second bracket limiting block (33); the inner peripheral wall of the annular sealing plate (4) is provided with a locking protrusion (60); when locked, the annular disk protrusion (64) abuts against the bracket limiting block on one side and is located axially inside the locking protrusion (60) to prevent the second annular disk (62) from axially disengaging from the annular sealing plate (4).

6. The cam phase adjustment mechanism for medium and heavy-duty diesel engines according to claim 5, characterized in that, It also includes a torsion spring positioning ring (8); the outer peripheral wall of the torsion spring positioning ring (8) is provided with a positioning opening (81); the inner peripheral wall of the torsion spring positioning ring (8) is provided with a torsion spring positioning protrusion (82) that protrudes radially and abuts against the connecting plate (63); the torsion spring positioning ring (8) is sleeved on the torsion spring bracket (6) and is positioned by the torsion spring positioning protrusion (82) abutting against the connecting plate (63); the annular torsion spring (5) is sleeved on the torsion spring positioning ring (8), and the inner end of the annular torsion spring (5) is hooked at the positioning opening (81), and the outer end of the annular torsion spring (5) is hooked on the annular sealing plate (4); the torsion spring positioning ring (8) is pressed against the connecting plate (63) under the force of the annular torsion spring (5).

7. The cam phase adjustment mechanism for medium and heavy-duty diesel engines according to claim 6, characterized in that, A positioning screw (41) is axially arranged between the annular sealing plate (4) and the annular stator (2); the inner end of the positioning screw (41) passes through the annular sealing plate (4) and connects to the annular stator (2), and the outer end of the positioning screw (41) extends outside the annular sealing plate (4) and hooks the outer end of the annular torsion spring (5) onto the positioning screw (41).

8. The cam phase adjustment mechanism for medium and heavy-duty diesel engines according to claim 1, characterized in that, The annular sealing plate (4), the annular stator (2) and the annular gear (1) are provided with a number of screw connection holes, and are connected and fixed together by each connecting screw (10) passing through the annular sealing plate (4), the annular stator (2) and the annular gear (1) in sequence.

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