Cam phase adjusting structure for medium-heavy diesel engine

Abstract

The invention relates to the technical field of variable valve timing, in particular to a cam phase adjusting structure for a medium-heavy diesel engine, which comprises a phaser body and a bolt control valve. The phaser body comprises an annular gear, an annular stator, a rotor, an annular sealing plate, an annular torsional spring and a torsional spring support which are coaxially arranged. An annular gasket groove is formed in the rotor; an annular gasket used for increasing the friction coefficient is arranged in the annular gasket groove, the annular sealing plate is fixed to the annular stator, and the torsional spring support is detachably connected to the annular sealing plate. The annular torsional spring is sleeved on the torsional spring bracket, one end of the annular torsional spring is fixed on the torsional spring bracket, and the other end of the annular torsional spring is fixed on the annular sealing plate; the bolt control valve is inserted in the middle of the phaser body. The connecting structure has the advantages that the whole structure is more compact, and the connectivity and reliability are higher; the friction coefficient of the joint face of the cam shaft and the rotor is increased through the annular gasket, the high-torque requirement is met, and meanwhile disassembly and assembly convenience is improved through a detachable installation structure.

Description

Technical Field

[0001] The present invention relates to the technical field of variable valve timing, and in particular to a cam phase adjustment structure for medium and heavy-duty diesel engines. Background Art

[0002] In order to meet the 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 improvement of global environmental protection requirements, the overall greenhouse gas, carbon dioxide emissions and control and the need for fuel economy and commercial truck use costs, most commercial vehicles are also facing the challenge of electrification, but it is still expected that diesel engines (displacement 6L~20L) in the commercial vehicle field will maintain their dominant position in the medium term, among which the opportunities for alternative fuel applications and VCT (variable cam timing phaser, hereinafter referred to as phaser or VCT) will increase.

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

[0004] Phaser technology is not used in existing medium and heavy-duty diesel engines. Since the structure required by diesel engines requires higher reliability of overall components, longer mileage, and harsher operating environment, the phasers of traditional gasoline engines cannot be simply and directly copied and used in diesel engines due to insufficient reliability requirements of the structure. Summary of the invention

[0005] The present invention aims to solve the technical problem that the phaser structure on the existing gasoline engine cannot be directly copied and used on the diesel engine. In order to overcome the defects of the above-mentioned prior art, the present invention provides a structure that is more compact and convenient to install. By arranging an annular gasket, the friction coefficient of the camshaft and the rotor joint surface is increased to adapt to high torque requirements. The torsion spring bracket with a detachable structure facilitates the disassembly and replacement of the annular torsion spring, thereby improving the reliability of the overall structure and the convenience of installation.

[0006] In order to achieve the purpose of the present invention, the following technical solutions are adopted: A cam phase adjustment structure for a medium and heavy-duty diesel engine, comprising a phaser body and a bolt control valve; the phaser body comprises a coaxially arranged annular gear, annular stator, rotor, annular sealing plate, annular torsion spring and torsion spring bracket; the annular gear is fixedly connected to one axial side of the annular stator; the rotor is rotatably connected in the annular stator; an annular gasket groove is provided on the side of the rotor close to the annular gear; an annular gasket for increasing the friction coefficient is provided in the annular gasket groove, the annular gasket is coaxially arranged with the rotor, and the annular gasket is axially limited between the rotor and the annular gear; the annular sealing plate is fixedly connected to the other axial side of the annular stator, and the rotor is axially limited between the annular sealing plate and the annular gear; the torsion spring bracket is detachably connected to the annular sealing plate; the annular torsion spring is sleeved on the torsion spring bracket, and the annular torsion spring is axially limited between the torsion spring bracket and the annular sealing plate, one end of the annular torsion spring is fixed on the torsion spring bracket, and the other end of the annular torsion spring is fixed on the annular sealing plate; the bolt control valve is inserted in the middle of the phaser body and is used to control the operation of the phaser body. The structure is more compact as a whole through the fixed connection between the annular gear, the annular stator and the annular sealing plate, and has stronger connectivity and reliability. By installing an annular gasket between the annular sealing plate and the annular gear, the friction coefficient of the camshaft and rotor joint surface is increased to adapt to 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 annular torsion spring, and the detachable installation structure can also ensure the stability and reliability of the structure.

[0007] Preferably, the annular gasket is made of corundum material, which increases the overall strength and friction and ensures the service life.

[0008] Preferably, a circular mounting groove is provided on the side of the rotor away from the annular gear; a bracket limiting portion is provided in the circular mounting groove; the bracket limiting portion includes a first bracket limiting block and a second bracket limiting block arranged at a circumferential interval; the first bracket limiting block and the second bracket limiting block are both radially arranged on the inner circumferential wall of the circular mounting groove, and 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 is arranged in parallel; 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 circumferential wall of the second annular disk; the annular disk protrusion is inserted in the circular mounting groove and is located between the first bracket limiting block and the second bracket limiting block; a locking protrusion is provided on the inner circumferential wall of the annular sealing plate; when locking, 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 separating from the annular sealing plate. The above structure can realize the two states of locking and unlocking by rotating the torsion spring bracket, which is convenient for installation and disassembly and improves the convenience of replacing the annular torsion spring.

[0009] Preferably, it also includes a torsion spring positioning ring; a positioning opening is provided on the outer peripheral wall of the torsion spring positioning ring; a torsion spring positioning protrusion which is radially protruding and abuts with the connecting plate is provided on the inner peripheral wall of the torsion spring positioning ring; the torsion spring positioning ring is sleeved on the torsion spring bracket, and the positioning is achieved by abutting with the connecting plate through the torsion spring positioning protrusion; the annular torsion spring is sleeved on the torsion spring positioning ring, and the inner end of the annular torsion spring is hooked at the positioning opening, and the outer end of the annular torsion spring is hooked on the annular sealing plate; the torsion spring positioning ring is pressed against the connecting plate under the action of the annular torsion spring. The positioning opening makes it convenient to hook one end of the annular torsion spring for fixing, and at the same time, under the action of the annular torsion spring, the torsion spring positioning ring can abut with the connecting plate, which further facilitates the positioning and fixing of the torsion spring bracket, and also ensures the reliability and connectivity of the overall structure.

[0010] Preferably, a positioning screw is axially arranged between the annular sealing plate and the annular stator; the axial inner end of the positioning screw passes through the annular sealing plate and is connected to the annular stator, the outer end of the positioning screw extends outside the annular sealing plate, and the outer end of the annular torsion spring is hooked on the positioning screw. The positioning screw can be used to conveniently position the annular stator and the annular sealing plate to prevent misalignment and inadequate installation, and can also facilitate the other end of the annular torsion spring to be hooked on the positioning screw for fixing, thereby improving the convenience of disassembly and assembly of the annular torsion spring.

[0011] Preferably, three rotor blades are arranged on the outer circumferential wall of the rotor at intervals in the circumferential direction; the three rotor blades include two small rotor blades and one large rotor blade; the inner circumferential wall of the annular stator is provided with three rotor active cavities corresponding to the rotor blades; each of the rotor blades is correspondingly installed in each rotor active cavity, and a sealing strip groove is arranged on the outer circumferential wall of the small rotor blade; a sealing strip arranged axially is arranged in the sealing strip groove; the sealing strip abuts against the inner wall of the rotor active cavity, and an active gap is arranged between the outer circumferential wall of the large rotor blade and the inner circumferential wall of the rotor active cavity. The cam phase adjustment structure is arranged on the exhaust end side of the engine; the exhaust side adjusts the phase through torsional vibration, and the original sealing strip design is cancelled on the large rotor blade, which is equivalent to changing the original three-chamber structure into a two-chamber structure, so that the space between the advance chamber and the retard chamber in the phaser on the exhaust end side of the engine is connected, so that the exhaust side speed regulation can be faster and more stable, and the speed regulation efficiency and stability of the overall structure are improved. In addition, by only canceling the sealing strip on the large rotor blade, more common parts can be maintained with the cam phase adjustment structure on the intake end side of the engine, so that the annular stator in the cam phase adjustment structure is shared, ensuring the structural and usage integrity, while saving materials and costs, and facilitating the production of parts.

[0012] Preferably, the rotor blade is provided with a threaded hole in the axial direction, and an idle assembly is installed in the threaded hole, and the idle assembly includes a positioning pin, a spring and a screw plug; the positioning pin is pressed against the gear under the action of the spring, and the screw plug is pressed against the sealing plate under the action of the spring. The positioning pin is positioned on the positioning hole on the ring gear, and after the oil pressure cavity is driven by oil pressure, the positioning pin can slide out from the specified position to ensure that the idle effect can be achieved stably.

[0013] Preferably, the bolt control valve includes a control valve body and a valve core coaxially arranged in the control valve body; the control valve body is inserted in the middle of the phaser body from the torsion spring bracket to the ring gear direction and abuts against the second ring disk, and one end of the control valve body passing through the ring gear is provided with a connecting thread connected to the camshaft; the end of the valve core close to the ring gear is provided with a ball-type one-way valve. The ball-type one-way valve replaces the reed-type one-way valve structure, which is more suitable for high pressure and better reliability, so that the bolt control valve is combined with the phaser body to apply the phaser structure to medium and heavy diesel engines.

[0014] Preferably, it also includes an engine housing, a camshaft, a plurality of transmission ring gears and a solenoid valve; the camshaft is rotatably connected in the engine housing, and the phaser body is tightly connected to the end of the camshaft through the bolt control valve; the ring gear in the phaser body meshes with the transmission ring gear to achieve transmission; the solenoid valve is installed on the engine housing, and a corresponding gap is set between the solenoid valve and the bolt control valve. The arrangement of the phaser, bolt control valve and solenoid valve and the matching structure can be well applied to medium and heavy diesel engines.

[0015] Preferably, the annular sealing plate, the annular stator and the annular gear are provided with a plurality of screw connection holes, and each connection screw passes through the annular sealing plate, the annular stator and the annular gear in sequence to connect and fix them together. The connection screws facilitate the installation and connection of the three, improve the overall coaxiality and connectivity, and ensure the reliability of the overall structure.

[0016] To sum up, the advantages of the present invention are that the structure is more compact as a whole through the fixed connection between the annular gear, the annular stator and the annular sealing plate, and the connectivity and reliability are stronger; by installing an annular gasket between the annular sealing plate and the annular gear, the friction coefficient of the camshaft and rotor joint surface is increased to adapt to high torque requirements, further ensuring that it can be used in medium and heavy-duty diesel engines, and at the same time, the detachable installation method of the torsion spring bracket facilitates the installation and replacement of the annular torsion spring, and the detachable installation structure can also ensure the stability and reliability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a cam phase adjustment structure for a medium and heavy-duty diesel engine of the present invention.

[0018] Figure 2 It is an exploded schematic diagram of the cam phase adjustment structure for medium and heavy-duty diesel engines of the present invention.

[0019] Figure 3 It is a cross-sectional view of the phaser body in the present invention.

[0020] Figure 4 It is an exploded schematic diagram of the front side of the phaser body in the present invention.

[0021] Figure 5 It is an exploded schematic diagram of the front side of the phaser body in the present invention.

[0022] Figure 6 It is an exploded schematic diagram of the bolt control valve in the present invention.

[0023] Among them: 1. annular gear; 2. annular stator; 21. rotor active cavity; 3. rotor; 30. annular gasket groove; 300. active gap; 301. small rotor blade; 302. large rotor blade; 303. sealing strip groove; 304. sealing strip; 305. positioning pin; 306. spring; 307. screw plug; 31. circular mounting groove; 32. first bracket limit block; 33. first bracket limit block; 4. annular sealing plate; 41. positioning screw; 5. annular torsion spring; 6. torsion spring bracket; 60. locking protrusion; 61. first annular disk; 62. second annular disk; 63. connecting plate; 64. annular disk protrusion; 7. annular gasket; 8. torsion spring positioning ring; 81. positioning opening; 82. torsion spring positioning protrusion; 9. bolt control valve; 91. control valve body; 92. valve core; 93. connecting thread; 94. ball check valve; 10. connecting screw. DETAILED DESCRIPTION

[0024] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0025] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0026] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] like Figures 1 to 6As shown, the exhaust end side and the intake end side of the engine of the medium and heavy-duty diesel engine are respectively provided with a cam phase adjustment phaser, a cam phase adjustment structure for medium and heavy-duty diesel engines, the structure of the present application is used in the exhaust end side of the power of the medium and heavy-duty diesel engine, including a phaser body and a bolt control valve 9; the phaser body 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 bracket 6. The ring gear 1 abandons the use of a traditional powder metallurgy sprocket and uses an integral forged ring gear to achieve higher strength and hardness. The strength of the ring stator 2 and the rotor 3 is higher than that of the phaser of the ordinary gasoline engine type, and a higher density powder metallurgy model is adopted. The ring stator 2 is fixedly connected to the axial left side of the ring gear 1, and the rotor 3 is rotatably connected in 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 friction coefficient is provided in the annular gasket groove 30, and 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 corundum material. The corundum material makes the overall strength and friction higher and can ensure the service life. The annular sealing plate 4 is fixedly connected to the axial left side of the annular stator 2, and the rotor 3 is axially limited between the annular sealing plate 4 and the annular gear 1. Six screw connection holes are correspondingly arranged on the annular sealing plate 4, the annular stator 2 and the annular gear 1, two in a group, and three groups are arranged at equal intervals along the circumferential direction, and six connecting screws 10 are sequentially passed through the annular sealing plate 4, the annular stator 2 and the annular gear 1 to connect and fix together. The connecting screws 10 are convenient for connecting and installing the three, ensuring the overall coaxiality and connectivity, and at the same time 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, the annular torsion spring 5 is axially limited between the torsion spring bracket 6 and the annular sealing plate 4, and 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. The bolt control valve 9 is axially inserted in the middle of the phaser body and is used to control the operation of the phaser body. The bolt control valve 9 on the exhaust side controls the connection of the internal oil circuit, and the engine oil is used as the medium for transmitting the oil pressure. The engine cam torsional vibration force is used to achieve self-adaptive phase adjustment. The ring gear 1, the ring stator 2 and the ring sealing plate 4 on the structure are fixedly connected by connecting screws 10, which makes the overall structure more compact, and the connectivity and reliability are stronger; by installing an annular gasket 7 between the annular sealing plate 4 and the annular gear 1, the friction coefficient of the joint surface between the camshaft and the rotor 3 is increased to meet the high torque requirements, further ensuring that it can be used in medium and heavy 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 can also ensure the stability and reliability of the structure.

[0029] like Figures 1 to 5As shown, three rotor blades are arranged at equal intervals along the circumferential direction on the outer peripheral wall of the rotor 3, and the three rotor blades include two small rotor blades 301 and one large rotor blade 302. Three rotor active cavities 21 corresponding to the positions of the rotor blades are arranged on the inner peripheral wall of the annular stator 2; each rotor blade is correspondingly installed in each rotor active cavity 21, and a sealing strip groove 303 is arranged on the outer peripheral wall of the small rotor blade 301; a sealing strip 304 is arranged axially in the sealing strip groove 303; the sealing strip 304 abuts against the inner wall of the rotor active cavity 21, so that the small rotor blade 301 is sealed with the inside of the annular stator 2, and the sealing strip 304 is made of powder metallurgy instead of the original resin, which is suitable for harsh environments with higher torque and pressure. An active gap 300 is arranged between the outer peripheral wall of the large rotor blade 302 and the inner peripheral wall of the rotor active cavity 21. The rotor blades rotate in the rotor active cavity 21, and the design of the sealing strip 304 is cancelled on the rotor large blade 302, which is equivalent to changing the original three-cavity structure into a two-cavity structure, so that the space between the advance cavity and the retardation cavity in the phaser on the exhaust end side of the engine is connected, so that the exhaust side speed regulation can be faster and more stable, and the speed regulation efficiency and stability of the overall structure are improved. And by only canceling the sealing strip 304 on the rotor large blade 302, more common parts can be maintained with the three-cavity structure in the phaser on the intake end side of the engine, and the annular stator can be shared, ensuring the structural and use integrity, while saving materials and costs, and facilitating the production of parts. A threaded hole is axially arranged on the rotor large blade 302, and an idle assembly is installed in the threaded hole. The idle assembly includes a coaxially arranged positioning pin 305, a spring 306 and a screw plug 307; the positioning pin 305 is pressed against the ring gear 1 under the action of the spring 306, and the screw plug 307 is pressed against the annular sealing plate 4 under the action of the spring 306. When in the idle state, the positioning pin 305 limits the rotor 3 to a specified position. The positioning pin 305 is positioned on the positioning hole on the ring gear 1. After the hydraulic cavity is driven by the oil pressure, the positioning pin 305 can slide out from the specified position to ensure that the idling effect can be achieved stably.

[0030] like Figures 1 to 5As 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 degrees apart. Each bracket limiting part includes a first bracket limiting block 32 and a second bracket limiting block 33 spaced apart along the circumferential direction, 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 radially face the center of the rotor 3, and the torsion spring bracket 6 includes a first annular disk 61 and a second annular disk 62 coaxially arranged; and the first annular disk 61 is located axially outside the second annular disk 62 and is arranged in parallel. The size of the first annular disk 61 is larger than that 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, and 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, and the annular disc protrusions 64 protrude radially toward the center of the rotor 3; the annular disc protrusions 64 are facing 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 locking, the annular disc protrusion 64 is inserted into the circular mounting groove 31 and is located between the first bracket limit block 32 and the second bracket limit block 33, and the annular disc protrusion 64 can slide on the circular mounting groove 31 by rotation, and finally the annular disc protrusion 64 on the torsion spring bracket 6 is pressed against the bracket limit block (the second bracket limit block 33 in the figure) close to the locking protrusion 60 and is located on the inner side of the locking protrusion 60, thereby preventing the second annular disc 62 from axially disengaging from the annular sealing plate 4, and the torsion spring bracket 6 can be locked and fixed between the annular sealing plate 4 and the rotor 3. The above structure can realize the two states of locking and unlocking by rotating the torsion spring bracket 6, which is convenient for installation and disassembly and improves the convenience of replacing the annular torsion spring 5.

[0031] like Figure 4 and Figure 5As 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 projection 82 is provided on the inner peripheral wall of the torsion spring positioning ring 8, which is radially protruding and abutting and cooperating with the connecting plate 63; the torsion spring positioning projection 82 radially protrudes 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 by the torsion spring positioning projection 82; 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 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, the torsion spring positioning ring 8 can abut against the connecting plate 63, further facilitating the positioning and fixing of the torsion spring bracket 6, thereby preventing and also ensuring the reliability and connectivity of the overall structure.

[0032] like Figure 4 and Figure 5 As shown, a positioning screw 41 is further 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 is connected to the annular stator 2, and the outer end of the positioning screw 41 extends outside the annular sealing plate 4, and the outer end of the annular torsion spring 5 is fixed on the positioning screw 41. The positioning screw 41 can be used to conveniently position the annular stator 2 and the annular sealing plate 4 to prevent misalignment and inadequate installation, and at the same time, it can also be convenient to hook the other end of the annular torsion spring 5 on the positioning screw 41 for fixing, thereby improving the convenience of disassembly and assembly of the annular torsion spring 5.

[0033] like Figure 1 and Figure 6As shown, the bolt control valve 9 includes a control valve body 91 and a valve core 92 arranged in the control valve body 91; the control valve body 91 is inserted in the middle of the phaser body from the torsion spring bracket 6 to the ring gear 1, and is against the second annular disk 62. The control valve body 91 passes through the ring gear 1 and is provided with a connecting thread 93 connected to the camshaft at one end; the valve core 92 is provided with a ball-type one-way valve 94 at one end close to the ring gear 1. The ball-type one-way valve 94 replaces the original reed-type one-way valve structure, which is more suitable for high pressure and better reliability, so that the bolt control valve 9 is combined with the phaser body to apply the phaser structure to medium and heavy diesel engines. It also includes an engine housing, a camshaft, a plurality of transmission ring gears and a solenoid valve; the camshaft is rotatably connected in the engine housing, and the phaser body is tightly connected to the end of the camshaft through the bolt control valve 9; the ring gear 1 in the phaser body meshes with the transmission ring gear to achieve transmission; the solenoid valve is installed on the engine housing, and a corresponding gap is set between the solenoid valve and the bolt control valve 9. The arrangement of the phaser, the bolt control valve 9 and the solenoid valve and the matching structure can be well applied to medium and heavy diesel engines.

[0034] To sum up, the advantage of the present invention is that the structure is fixedly connected between the ring gear 1, the ring stator 2 and the ring sealing plate 4 to make the whole structure more compact, and the connectivity and reliability are stronger; by installing the annular gasket 7 between the annular sealing plate 4 and the ring gear 1, the friction coefficient of the joint surface between the camshaft and the rotor 3 is increased to adapt to high torque requirements, further ensuring that it can be used in medium and heavy-duty diesel engines, and 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 can also ensure the stability and reliability of the structure.

[0035] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships 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, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0036] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A cam phase adjustment structure for a medium and heavy diesel engine, characterized in that: The invention comprises a phaser body and a bolt control valve (9); the phaser body comprises a coaxially arranged annular gear (1), an annular stator (2), a rotor (3), an annular sealing plate (4), an annular torsion spring (5) and a torsion spring bracket (6); the annular gear (1) is fixedly connected to one axial side of the annular stator (2); the rotor (3) is rotatably connected inside the annular stator (2); an annular gasket groove (30) is provided on one side of the rotor (3) close to the annular gear (1); an annular gasket (7) for increasing the friction coefficient 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 annular gear. The annular sealing plate (4) is fixedly connected to the other axial side of the annular stator (2), and axially limits the rotor (3) between the annular sealing plate (4) and the annular gear (1); 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), 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 to the torsion spring bracket (6), and the other end of the annular torsion spring (5) is fixed to the annular sealing plate (4); the bolt control valve (9) is inserted in the middle of the phaser body and is used to control the operation of the phaser body.

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

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

4. The cam phase adjustment structure for medium and heavy-duty diesel engines according to claim 3, characterized in that: 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 projection (82) is provided on the inner peripheral wall of the torsion spring positioning ring (8) and is radially protruding and abutting 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 projection (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 action of the annular torsion spring (5).

5. The cam phase adjustment structure for medium and heavy-duty diesel engines according to claim 4, characterized in that: A positioning screw (41) is also axially arranged 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 is connected to the annular stator (2), the outer end of the positioning screw (41) extends outside the annular sealing plate (4), and the outer end of the annular torsion spring (5) is hooked on the positioning screw (41).

6. The cam phase adjustment structure for medium and heavy-duty diesel engines according to claim 1, characterized in that: Three rotor blades are arranged at intervals along the circumferential direction on the outer peripheral wall of the rotor (3); 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 active cavities (21) corresponding to the rotor blades; each of the rotor blades is correspondingly installed in each rotor active cavity (21); a sealing strip groove (303) is arranged on the outer peripheral wall of the small rotor blade (301); a sealing strip (304) arranged in the axial direction is arranged in the sealing strip groove (303); the sealing strip (304) is abutted against the inner wall of the rotor active cavity (21); and an active gap (300) is arranged between the outer peripheral wall of the large rotor blade (302) and the inner peripheral wall of the rotor active cavity (21).

7. The cam phase adjustment structure for medium and heavy-duty diesel engines according to claim 6, characterized in that: A threaded hole is axially arranged on the large rotor blade (302), an idle assembly is installed in the threaded hole, and the idle assembly comprises a positioning pin (305), a spring (306) and a screw plug (307); the positioning pin (305) is pressed against the gear (1) under the action of the spring (306), and the screw plug (307) is pressed against the sealing plate (4) under the action of the spring (306).

8. The cam phase adjustment structure for medium and heavy-duty diesel engines according to claim 3, characterized in that: The bolt control valve (9) comprises a control valve body (91) and a valve core (92) coaxially arranged in the control valve body (91); the control valve body (91) is inserted in the middle of the phaser body from the torsion spring bracket (6) towards the ring gear (1) and abuts against the second ring disk (62); one end of the control valve body (91) passing through the ring gear (1) is provided with a connecting thread (93) connected to the camshaft; and one end of the valve core (92) close to the ring gear (1) is provided with a ball-type one-way valve (94).

9. The cam phase adjustment structure for medium and heavy-duty diesel engines according to claim 8, characterized in that: It also includes an engine housing, a camshaft, a plurality of transmission ring gears and a solenoid valve; the camshaft is rotatably connected in the engine housing, and the phaser body is tightly connected to the end of the camshaft through the bolt control valve (9); the ring gear (1) in the phaser body meshes with the transmission ring gear to achieve transmission; the solenoid valve is mounted on the engine housing, and a corresponding gap is provided between the solenoid valve and the bolt control valve (9).

10. The cam phase adjustment structure 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 correspondingly provided with a plurality of screw connection holes, and each connection screw (10) passes through the annular sealing plate (4), the annular stator (2) and the annular gear (1) in sequence to connect and fix them together.

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