Single overhead intake and exhaust cam phase adjusting device, engine and vehicle

Abstract

According to the single overhead intake and exhaust cam phase adjusting device provided by the invention, an air valve adjusting scheme of two parallel cam shafts of a common double overhead cam shaft is completed by adjusting the two groups of cam shafts which are mutually nested inside and outside, and the phase angles of the cam parts at the corresponding positions on the two cam shafts of the concentric single overhead cam shaft can be adjusted; therefore, in order to meet the requirement of the working condition, control over the variable phase difference angle is achieved through phase adjusting assemblies connected to the ends of the inner cam shaft and the outer cam shaft, each phase adjusting assembly comprises a rotating arm and a vane plate which are circumferentially positioned with the inner cam shaft and the outer cam shaft respectively, and the vane plates and the rotating arms can relatively rotate within the preset angle range. The rotation amplitude can be accurately controlled through oil pressure, so that accurate control of phase angles of the inner cam shaft and the outer cam shaft is achieved, and control of an air inlet valve and an air outlet valve of the single overhead cam shaft can be achieved. The invention further provides an engine comprising the single overhead intake and exhaust cam phase adjusting device and a vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a single overhead intake and exhaust cam phase adjustment device, and also to an engine and a vehicle. Background Art

[0002] With the advancement of engine technology and the increasing requirements of regulations on engine emissions and fuel consumption, variable valve timing (VVT) technology has become a must-have technology. The system adjusts the phase of the engine cam through the control and execution system of the duty cycle, so that the opening and closing of the valve can be adjusted according to the changes in the engine speed, load and other working conditions, achieving the best power performance, fuel economy and improved emissions. The adjustment of the tracking path VVT is mainly composed of a control valve and a solenoid valve. The electromagnet can push the control valve to different stroke positions at different duty cycles, thereby controlling the opening of the oil port and the switching of the oil circuit. According to the release state of different oil supply, the rotor can be adjusted in advance or lag relative to the stator.

[0003] Currently, the more popular and mature one is the mid-mounted VVT of the dual overhead cam (DOHC) engine, but this technical solution cannot meet the variable valve adjustment of the single overhead cam (SOHC) engine and cannot reach the valve adjustment requirements of the single overhead cam engine.

[0004] In summary, the existing variable valve timing system cannot meet the technical problem of the valve control requirements of the single overhead cam engine. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing variable valve timing system cannot meet the valve control requirements of a single overhead cam engine.

[0006] In order to solve the above problems, the present invention provides a single overhead intake and exhaust cam phase adjustment device, comprising an inner camshaft and an outer camshaft and a phase adjustment component located at one end of the two, the outer camshaft is in the shape of a hollow shaft, and the inner camshaft is coaxially rotatably arranged in the outer camshaft; the phase adjustment component includes a vane and a rotating arm that can rotate relative to each other within a preset angle range, the vane is circumferentially positioned and connected to the outer camshaft, and the rotating arm is circumferentially positioned and connected to the inner camshaft via a connecting rod mechanism, and the phase angle between the inner camshaft and the outer camshaft is maintained through the cooperation between the vane and the rotating arm to achieve phase adjustment of the intake and exhaust.

[0007] The single overhead intake and exhaust cam phase adjustment device provided by the present invention can be used for variable valve adjustment of a single overhead cam engine, and the valve adjustment scheme of two parallel camshafts of a general double overhead camshaft is completed by two sets of camshafts nested inside and outside each other. Since the phase angle of the phase difference can be adjusted by the interval of the cam parts at corresponding positions on the two camshafts of the double overhead camshaft, in order to meet the working condition requirements, the control of the variable phase difference angle is achieved by a phase adjustment component connected to the respective ends of the inner and outer camshafts. The phase adjustment component includes a rotating arm and a vane respectively positioned circumferentially with the inner camshaft and the outer camshaft, and the vane and the rotating arm can rotate relative to each other within a preset angle range. The amplitude of the rotation can be accurately controlled by oil pressure, thereby achieving accurate control of the phase angles of the inner and outer camshafts, and achieving intake and exhaust valve control of the single overhead camshaft, which effectively solves the technical problem that the existing variable valve timing system cannot meet the valve control requirements of the single overhead cam engine.

[0008] As a preferred solution, the connecting rod mechanism includes a central connecting plate in the shape of a rotating body and a short connecting rod rotatably connected to the side edge of the central connecting plate, the short connecting rod is rotatably connected to one end of the rotating arm, and the central area of ​​the central connecting plate is circumferentially positioned with the inner camshaft through a limiting hole. This design optimizes the matching mode between the rotating arm and the inner camshaft. The two are hingedly connected through the central connecting plate and the short connecting rod. The camshaft is fixedly matched with the central area of ​​the central connecting plate in the circumferential direction. The hinge position of the short connecting rod is located at the edge of the central connecting plate. In this way, when the camshaft rotates axially, the central connecting plate is driven to rotate synchronously, thereby pulling the connected short connecting rod.

[0009] As a preferred solution, the phase adjustment assembly includes a timing sprocket, positioning plates respectively positioned and installed on the end faces of both sides of the timing sprocket, and a phase wheel circumferentially positioned with the inner edge of the timing sprocket, and a hydraulic control oil circuit is provided in the phase wheel and the positioning plate, one end of the rotating arm is hinged to the positioning plate on the corresponding side at the end away from the short connecting rod, and the outer camshaft is fixedly installed with the phase wheel. This design optimizes the other structural distributions of the phase adjustment assembly, including the timing sprocket, the phase wheel, and the hydraulic control oil circuit located in the phase wheel and the positioning plate, which is connected to the oil circuit in the camshaft, and the clutch phase adjustment can be controlled by hydraulic pressure.

[0010] As a preferred solution, the blade is in the shape of a rotating body, and its plate surface has a penetrating guide groove. A guide pin is provided in the middle of the rotating arm, and the guide pin is accommodated in the guide groove. The cooperation between the guide groove and the guide pin limits the limit relative rotation angle between the blade and the rotating arm. This design optimizes the angle limiting cooperation structure between the blade and the rotating arm. The guide groove limits the sliding track and the maximum movement range of the guide pin slidably located therein through its own narrow and long structure, so that the rotating arm rotates relative to the blade at a controllable angle difference.

[0011] As a preferred solution, the rotating arm is connected to a tension spring at one end connected to the short connecting rod, which is used to provide elastic buffering when the rotating arm rotates relative to the blade. This design optimizes the auxiliary structure design of the rotating arm, and a tension spring structure is set at the end connected to the short connecting rod. Through such a spring structure, a part of the kinetic energy of relative rotation can be converted into the potential energy of the spring, and released in a relatively gentle manner through the spring to achieve the effect of buffering and shock absorption.

[0012] As a preferred solution, the phase adjustment component includes two rotating arms spaced 180° apart, and a short connecting rod is connected to both ends of the central connecting plate spaced 180° apart, and the short connecting rod is hinged to the corresponding rotating arm. This design optimizes the overall design of the phase adjustment component and adopts a symmetrical structural distribution. In this way, when the inner and outer camshafts rotate relative to each other, the impeller and the rotating arm connected by the two can maintain a high degree of motion stability when the rotating arm and the impeller rotate, and the design of multiple rotating arm connection points can also enhance the strength of the connection.

[0013] As a preferred solution, the blade has a plate-like structure with an arc-shaped depression in the middle area, and the middle area of ​​the central connecting plate is provided with an arc-shaped guide block, and the blade and the central connecting plate are rotatably matched in a concave-convex manner. This arrangement optimizes the matching between the blade and the central connecting plate, and the concave-convex matching of the arc-shaped structure between the two can provide a rotation guide, so that the movement stability of the structure itself is better.

[0014] As a preferred solution, the positioning plate adjacent to the blade is hollow and annular, the arc-shaped depression in the middle of the blade sinks into the hollow area of ​​the positioning plate, and the blade has a symmetrically distributed counterweight structure at the position where the positioning pin is connected. This design is consistent with the design idea of ​​the above structure. As a further extension, the positioning plate has a circular hollow groove that matches the rotating outer diameter of the blade, so that the two can be guided by each other in a concave-convex matching manner.

[0015] The present invention also provides an engine comprising any one of the above-mentioned single overhead intake and exhaust cam phase adjustment devices. Since the above-mentioned single overhead intake and exhaust cam phase adjustment device has the above-mentioned beneficial effects, the engine equipped with the single overhead intake and exhaust cam phase adjustment device should also have corresponding beneficial effects.

[0016] The present invention also provides a vehicle including the above engine. Since the above engine has the above beneficial effects, the vehicle equipped with the engine should also have corresponding beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A schematic diagram of the overall cross-sectional structure of a single overhead intake and exhaust cam phase adjustment device provided by the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the exploded structure of the phase adjustment assembly of the single overhead intake and exhaust cam phase adjustment device;

[0019] Figure 3 for Figure 1 A schematic diagram of a partial side view of the phase adjustment assembly of the single overhead intake and exhaust cam phase adjustment device;

[0020] in, Figure 1-Figure 3 middle:

[0021] 1. Inner camshaft; 2. Outer camshaft; 3. Phase adjustment assembly; 3-1. Timing sprocket; 3-2. Center connecting plate; 3-3. Short connecting rod; 3-4. Positioning plate; 3-5. Tension spring; 3-6. Phase wheel; 3-7. Rotating arm; 3-8. Guide pin; 3-9. Blade; 3-10. Counterweight structure; 3-11. Guide groove. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0023] Before explaining the working principle of the present invention in detail, the description of the present invention needs to be further explained: In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welding connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] refer to Figure 1-Figure 3 The following embodiments are described, Figure 1A schematic diagram of the overall cross-sectional structure of a single overhead intake and exhaust cam phase adjustment device provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the exploded structure of the phase adjustment assembly of the single overhead intake and exhaust cam phase adjustment device; Figure 3 for Figure 1 A schematic diagram of the partial side view of the phase adjustment component of the mid-single overhead intake and exhaust cam phase adjustment device.

[0026] The single overhead intake and exhaust cam phase adjustment device provided in this embodiment includes an inner camshaft 1 and an outer camshaft 2 and a phase adjustment component 3 located at one end of the inner camshaft 1 and the outer camshaft 2. The outer camshaft 2 is in the shape of a hollow shaft, and the inner camshaft 1 is coaxially rotatably arranged in the outer camshaft 2; the phase adjustment component 3 includes a vane 3-9 and a rotating arm 3-7 that can rotate relative to each other within a preset angle range, the vane 3-9 is circumferentially positioned and connected to the outer camshaft 2, and the rotating arm 3-7 is circumferentially positioned and connected to the inner camshaft 1 through a connecting rod mechanism, and the phase angle between the inner camshaft 1 and the outer camshaft 2 is maintained through the cooperation between the vane 3-9 and the rotating arm 3-7 to achieve phase adjustment of the intake and exhaust.

[0027] The single overhead intake and exhaust cam phase adjustment device provided by the present invention can be used for variable valve adjustment of a single overhead cam engine. The valve adjustment scheme of two parallel camshafts of a general double overhead camshaft is completed by two sets of camshafts nested inside and outside. Since the phase angle of the phase difference can be adjusted by the interval of the cam parts at corresponding positions on the two camshafts of the double overhead camshaft, in order to meet the working condition requirements, the control of the variable phase difference angle is achieved by connecting the phase adjustment component 3 at the respective ends of the inner and outer camshafts 2. The phase adjustment component 3 includes a rotating arm 3-7 and a vane 3-9 respectively positioned circumferentially with the inner camshaft 1 and the outer camshaft 2, and the vane 3-9 and the rotating arm 3-7 can rotate relative to each other within a preset angle range. The amplitude of the rotation can be accurately controlled by oil pressure, thereby achieving accurate control of the phase angles of the inner and outer camshafts 2, and achieving intake and exhaust valve control of the single overhead camshaft, which effectively solves the technical problem that the existing variable valve timing system cannot meet the valve control requirements of the single overhead cam engine.

[0028] In the technical solution provided in this embodiment, the connecting rod mechanism includes a central connecting plate 3-2 in the shape of a rotating body and a short connecting rod 3-3 rotatably connected to the side edge of the central connecting plate 3-2, the short connecting rod 3-3 is rotatably connected to one end of the rotating arm 3-7, and the central area of ​​the central connecting plate 3-2 is circumferentially positioned with the inner camshaft 1 through a limiting hole. This design optimizes the matching mode between the rotating arm 3-7 and the inner camshaft 1. The two are hingedly connected through the central connecting plate 3-2 and the short connecting rod 3-3. The camshaft is fixedly matched with the central area of ​​the central connecting plate 3-2 in the circumferential direction. The hinge position of the short connecting rod 3-3 is located at the edge of the central connecting plate 3-2, so that when the camshaft rotates axially, the central connecting plate 3-2 is driven to rotate synchronously, thereby pulling the connected short connecting rod 3-3.

[0029] In the technical solution provided in this embodiment, the phase adjustment component 3 includes a timing sprocket 3-1, a positioning plate 3-4 respectively positioned and installed on the end faces of both sides of the timing sprocket 3-1, and a phase wheel 3-6 that is circumferentially positioned with the inner edge of the timing sprocket 3-1. A hydraulic control oil circuit is provided in the phase wheel 3-6 and the positioning plate 3-4. One end of the rotating arm 3-7 is hinged to the positioning plate 3-4 on the corresponding side at the end away from the short connecting rod 3-3, and the outer camshaft 2 is fixedly installed with the phase wheel 3-6. This design optimizes the other structural distributions of the phase adjustment component 3, including the timing sprocket 3-1, the phase wheel 3-6, and the hydraulic control oil circuit located in the phase wheel 3-6 and the positioning plate 3-4. The oil circuit is connected to the oil circuit in the camshaft, and the clutch phase adjustment can be controlled by hydraulic pressure.

[0030] In the technical solution provided in this embodiment, the blade 3-9 is in the shape of a rotating body, and its plate surface has a penetrating guide groove 3-11, and a guide pin 3-8 is provided in the middle of the rotating arm 3-7, and the guide pin 3-8 is accommodated in the guide groove 3-11. The limit relative rotation angle between the blade 3-9 and the rotating arm 3-7 is limited by the cooperation between the guide groove 3-11 and the guide pin 3-8. This design optimizes the angle limiting cooperation structure between the blade 3-9 and the blade 3-9 and the rotating arm 3-7. The guide groove 3-11 limits the sliding track and the maximum movement range of the guide pin 3-8 slidably located therein through its own narrow and long structure, so that the rotating arm 3-7 rotates relative to the blade 3-9 with a controllable angle difference.

[0031] In the technical solution provided in this embodiment, the rotating arm 3-7 is connected to a tension spring 3-5 at one end connected to the short connecting rod 3-3, which is used to provide elastic buffering when the rotating arm 3-7 rotates relative to the blade 3-9. This design optimizes the auxiliary structure design of the rotating arm 3-7, and a tension spring 3-5 structure is set at the end connected to the short connecting rod 3-3. Through such a spring structure, a part of the kinetic energy of relative rotation can be converted into the potential energy of the spring, and released in a relatively gentle manner through the spring to achieve the effect of buffering and shock absorption.

[0032] In the technical solution provided in this embodiment, the phase adjustment component 3 includes two rotating arms 3-7 spaced at an angle of 180°, and a short connecting rod 3-3 is connected to both ends of the central connecting plate 3-2 at an angle of 180°, and the short connecting rod 3-3 is hinged to the corresponding rotating arm 3-7. This design optimizes the overall design of the phase adjustment component 3 and adopts a symmetrical structural distribution, so that when the inner and outer camshafts 2 rotate relative to each other, the impeller and the rotating arm 3-7 respectively connected by the two can maintain a high motion stability when the rotating arm 3-7 and the impeller rotate, and the design of multiple rotating arm connection points can also enhance the strength of the connection.

[0033] In the technical solution provided by this embodiment, the blade 3-9 is a plate-like structure with an arc-shaped depression in the middle area, and the middle area of ​​the central connecting plate 3-2 is provided with an arc-shaped guide block, and the blade 3-9 and the central connecting plate 3-2 are rotatably matched in a concave-convex manner. This setting optimizes the cooperation between the blade 3-9 and the central connecting plate 3-2, and the concave-convex cooperation of the arc-shaped structure between the two can provide a rotation guide, so that the movement stability of the structure itself is better.

[0034] In the technical solution provided by this embodiment, the positioning plate 3-4 adjacent to the blade 3-9 is hollow and annular, the arc-shaped depression in the middle of the blade 3-9 sinks into the hollow area of ​​the positioning plate 3-4, and the blade 3-9 has a symmetrically distributed counterweight structure 3-10 at the position where the positioning pin is connected. This design is consistent with the design idea of ​​the above structure. As a further extension, the positioning plate 3-4 has a circular hollow groove that matches the rotating outer diameter of the blade 3-9, which can make the two mutually concave and convex match and guide each other.

[0035] The present invention also provides an engine including the above-mentioned single overhead intake and exhaust cam phase adjustment device. Since the single overhead intake and exhaust cam phase adjustment device in the above-mentioned embodiment has the above-mentioned beneficial effects, the engine equipped with the single overhead intake and exhaust cam phase adjustment device should also have corresponding beneficial effects. Further, the present invention also provides a vehicle including the above-mentioned engine. Since the engine in the above-mentioned embodiment has the above-mentioned beneficial effects, the vehicle equipped with the engine should also have corresponding beneficial effects.

[0036] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A single overhead intake and exhaust cam phase adjustment device, characterized in that: The invention comprises an inner camshaft (1) and an outer camshaft (2) and a phase adjustment component (3) located at one end of the inner camshaft (1), wherein the outer camshaft (2) is in the shape of a hollow shaft, and the inner camshaft (1) is coaxially rotatably arranged inside the outer camshaft (2); the phase adjustment component (3) comprises a blade plate (3-9) and a rotating arm (3-7) which are relatively rotatable within a preset angle range, wherein the blade plate (3-9) is circumferentially positioned and connected to the outer camshaft (2), and the rotating arm (3-7) is circumferentially positioned and connected to the inner camshaft (1) via a connecting rod mechanism, and the phase angle between the inner camshaft (1) and the outer camshaft (2) is maintained by the cooperation between the blade plate (3-9) and the rotating arm (3-7) to achieve phase adjustment of intake and exhaust.

2. The single overhead intake and exhaust cam phase adjustment device according to claim 1, characterized in that: The connecting rod mechanism comprises a central connecting plate (3-2) in the shape of a rotating body and a short connecting rod (3-3) rotatably connected to the side edge of the central connecting plate (3-2); the short connecting rod (3-3) is rotatably connected to one end of the rotating arm (3-7); and the central area of ​​the central connecting plate (3-2) is circumferentially positioned and matched with the inner camshaft (1) through a limiting hole.

3. The single overhead intake and exhaust cam phase adjustment device according to claim 2, characterized in that: The phase adjustment assembly (3) comprises a timing sprocket (3-1), positioning plates (3-4) respectively positioned and installed on the end surfaces of both sides of the timing sprocket (3-1), and a phase wheel (3-6) circumferentially positioned and matched with the inner edge of the timing sprocket (3-1), and a hydraulic control oil circuit is arranged in the phase wheel (3-6) and the positioning plate (3-4), one end of the rotating arm (3-7) is hinged to the positioning plate (3-4) on the corresponding side at the end away from the short connecting rod (3-3), and the outer camshaft (2) is fixedly installed on the phase wheel (3-6).

4. The single overhead intake and exhaust cam phase adjustment device according to claim 2 or 3, characterized in that: The blade (3-9) is in the shape of a rotating body, and its plate surface has a penetrating guide groove (3-11). A guide pin (3-8) is provided in the middle of the rotating arm (3-7), and the guide pin (3-8) is accommodated in the guide groove (3-11). The limit relative rotation angle between the blade (3-9) and the rotating arm (3-7) is limited by the cooperation between the guide groove (3-11) and the guide pin (3-8).

5. The single overhead intake and exhaust cam phase adjustment device according to claim 4, characterized in that: The rotating arm (3-7) is connected to a tension spring (3-5) at one end connected to the short connecting rod (3-3), which is used for providing elastic buffering when the rotating arm (3-7) rotates relative to the blade plate (3-9).

6. The single overhead intake and exhaust cam phase adjustment device according to claim 5, characterized in that: The phase adjustment component (3) comprises two rotating arms (3-7) spaced 180° apart, and both ends of the central connecting plate (3-2) are connected to a short connecting rod (3-3) at an angle of 180°. The short connecting rods (3-3) are hinged to the corresponding rotating arms (3-7).

7. The single overhead intake and exhaust cam phase adjustment device according to claim 6, characterized in that: The blade (3-9) is a plate-like structure with an arc-shaped depression in the middle region, and the middle region of the central connecting plate (3-2) is provided with an arc-shaped guide block, and the blade (3-9) and the central connecting plate (3-2) are rotatably matched in a concave-convex manner.

8. The single overhead intake and exhaust cam phase adjustment device according to claim 7, characterized in that: The positioning plate (3-4) adjacent to the blade (3-9) is in a hollow ring shape, the arc-shaped depression in the middle of the blade (3-9) is sunken into the hollow area of ​​the positioning plate (3-4), and the blade (3-9) has a symmetrically distributed counterweight structure (3-10) at the position where the positioning pin is connected.

9. An engine, comprising a housing, a power assembly and a phase assembly, characterized in that: The phase component is a single overhead intake and exhaust cam phase adjustment device as described in any one of claims 1-8.

10. A vehicle comprising a body assembly and an engine assembly, characterized in that: The engine assembly is the engine as claimed in claim 9.

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