Variable valve timing assembly and vehicle

Abstract

The embodiment of the present application provides a variable valve timing assembly and a vehicle, wherein the variable valve timing assembly includes: a camshaft, a timing pulley, a first cover plate, and a locking member disposed on the first cover plate; the timing pulley is sleeved on the camshaft and connected to the engine; the first cover plate is disposed on the timing pulley; the locking member includes an elastic member and a positioning pin, the first end of the elastic member is connected to the first cover plate, the second end of the elastic member is connected to the positioning pin, and the elastic member drives the positioning pin to move in an operating area, which is an area on the camshaft; a plurality of limiting holes are provided on the operating area, and when the positioning pin is located in at least one of the plurality of limiting holes, the camshaft and the timing pulley stop relative rotation. In this way, by changing the relative position between the positioning pin and the plurality of limiting holes in the operating area, multi-angle adjustment of the variable valve timing is achieved, thereby improving adjustment flexibility.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a variable valve timing assembly and a vehicle. Background Art

[0002] At high rpm, the engine needs more air, but the intake valve may close before the required air is fully in, resulting in reduced performance. Therefore, the timing of valve opening and closing is very important. Continuously open valves will cause unburned fuel to be expelled from the engine, which will reduce engine performance and increase exhaust pollution. On the other hand, if the cam keeps the valve open for a long time, as in racing, problems will occur at lower rpm.

[0003] Currently, the existing valve timing system (VVT) has limited adjustment timing angles, cannot be adjusted at multiple angles, and has low flexibility. Summary of the Invention

[0004] The embodiments of the present application provide a variable valve timing assembly and a vehicle to solve the problem of low flexibility of existing variable valve timing.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a variable valve timing assembly, comprising: a camshaft, a timing pulley, a first cover plate, and a locking member disposed on the first cover plate;

[0007] The timing pulley is sleeved on the camshaft, and the timing pulley is connected to the engine;

[0008] The first cover plate is arranged on the timing pulley;

[0009] The locking member includes an elastic member and a positioning pin, wherein a first end of the elastic member is connected to the first cover plate, and a second end of the elastic member is connected to the positioning pin, and the elastic member drives the positioning pin to move in an operating area, which is an area on the camshaft;

[0010] A plurality of limiting holes are provided on the operating area. When the positioning pin is located in at least one of the plurality of limiting holes, the camshaft and the timing pulley stop rotating relative to each other.

[0011] Optionally, the camshaft includes a positioning column, a shaft body, and an intermediate body arranged on the shaft body, and the timing pulley is sleeved on the intermediate body;

[0012] The intermediate body is provided with a first through hole, and the positioning post passes through the first through hole and is connected to the shaft body.

[0013] Optionally, the camshaft further includes an oil sealing plate provided on the intermediate body;

[0014] The oil sealing plate, the first cover plate and the timing pulley form a receiving cavity, and the intermediate body is located in the receiving cavity.

[0015] Optionally, the timing pulley further comprises a second cover plate provided on the timing pulley, the second cover plate and the first cover plate being arranged opposite to each other, and the oil sealing plate being located between the second cover plate and the intermediate body;

[0016] The oil sealing plate is provided with a second through hole, the second cover plate is provided with a third through hole, and the shaft passes through the third through hole and the second through hole in sequence to be connected to the intermediate body;

[0017] The vertical projection of the oil sealing plate on the second cover plate is located on the second cover plate.

[0018] Optionally, the intermediate body divides the accommodating cavity into a first chamber and a second chamber, the limiting hole is located on the intermediate body, and the first chamber and the second chamber are connected through the limiting hole.

[0019] Optionally, the shaft body is provided with an oil inlet and an oil outlet along the axial direction, and a first channel is provided in the shaft body, the first end of the first channel is connected to the oil inlet, the second end of the first channel is connected to the oil outlet, and the oil outlet is connected to the first chamber.

[0020] Optionally, an oil unloading hole is further provided on the oil sealing plate, and an oil unloading channel is provided on the intermediate body, a first end of the oil unloading channel is connected to the second chamber, and a second end of the oil unloading channel is connected to the oil unloading hole.

[0021] Optionally, the plurality of limiting holes are evenly arranged around the first through hole.

[0022] Optionally, a vertical projection of the oil sealing plate on the intermediate body is located on the intermediate body.

[0023] In a second aspect, an embodiment of the present application further provides a vehicle comprising the variable valve timing assembly as described above.

[0024] In the technical solution provided in the embodiment of the present application, a timing pulley is sleeved on a camshaft, a first cover plate is disposed on the timing pulley, a first end of an elastic member is connected to the first cover plate, and a second end of the elastic member is connected to a positioning pin. The elastic member drives the positioning pin to move within an operating area on the camshaft. The operating area is provided with multiple limiting holes. When the positioning pin is located in at least one of the multiple limiting holes, the camshaft and the timing pulley stop relative rotation. In this way, by changing the relative position between the positioning pin and the multiple limiting holes in the operating area, multi-angle adjustment of the camshaft and the timing pulley sleeved on the camshaft is achieved, that is, multi-angle adjustment of the variable valve timing is achieved, thereby improving adjustment flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 A schematic structural diagram of a variable valve timing assembly provided in an embodiment of the present application;

[0027] Figure 2 Another structural schematic diagram of the variable valve timing assembly provided in an embodiment of the present application;

[0028] Figure 3 A schematic structural diagram of a timing pulley and a first cover plate provided in an embodiment of the present application;

[0029] Figure 4 A schematic structural diagram of an intermediate provided in an embodiment of the present application;

[0030] Figure 5 Another schematic structural diagram of the intermediate provided in the examples of the present application;

[0031] Figure 6 A schematic structural diagram of a second cover plate provided in an embodiment of the present application;

[0032] Figure 7 A schematic structural diagram of a shaft provided in an embodiment of the present application;

[0033] Figure 8 Another structural schematic diagram of the shaft provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field described in this application. The words "first", "second" and similar terms used in this application do not indicate any order, quantity or importance. They are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0036] Variable valve timing (VVT) is a technology used in automotive piston engines. VVT technology can adjust the overlap time and timing (partially or completely) of the engine's intake and exhaust systems to reduce fuel consumption and improve efficiency. Specifically, at high speeds, the engine needs more air, but the intake valve may close before the required air is fully in, resulting in reduced performance. Continuously open valves cause fuel to be discharged from the engine without being burned, which will reduce engine performance and increase exhaust pollution, so the idle speed of a racing engine cannot be too low. If the cam keeps the valve open for a long time, as in the case of racing cars, problems will arise at lower speeds.

[0037] The VVT mechanism in today's engines uses internal oil pressure combined with camshaft torque to adjust timing. However, the timing adjustment angle is limited and cannot be adjusted at multiple angles, which is not conducive to combustion development.

[0038] Therefore, an embodiment of the present application provides a variable valve timing assembly and a vehicle. Next, a variable valve timing assembly provided by the present application is introduced in detail.

[0039] See also Figures 1 to 6 , a variable valve timing assembly provided by an embodiment of the present application includes: a camshaft 10, a timing pulley 20, a first cover plate 30, and a locking member 40 provided on the first cover plate 30;

[0040] The timing pulley 20 is sleeved on the camshaft 10 and connected to the engine;

[0041] The first cover plate 30 is provided on the timing pulley 20;

[0042] The locking member 40 includes an elastic member 41 and a positioning pin 42. The first end of the elastic member 41 is connected to the first cover plate 30, and the second end of the elastic member 41 is connected to the positioning pin 42. The elastic member 41 drives the positioning pin 42 to move in the operating area, which is the area on the camshaft 10.

[0043] A plurality of limiting holes are provided on the operating area. When the positioning pin 42 is located in at least one of the plurality of limiting holes, the camshaft 10 and the timing pulley 20 stop rotating relative to each other.

[0044] The camshaft 10 is a component in a piston engine that controls the opening and closing of the valves. Because valve motion is crucial to an engine's power and operating characteristics, its design plays a crucial role in engine design. Specifically, the camshaft 10 is a cylindrical rod approximately the same length as the cylinder block.

[0045] In a specific implementation, the crankshaft drives the camshaft 10 via a timing belt, gears, or chain connected to a timing pulley 20 . The profile and position of the timing pulley 20 on the camshaft 10 are typically optimized for a specific engine speed.

[0046] In the technical solution provided in the embodiment of the present application, the timing pulley 20 is sleeved on the camshaft 10, the first cover plate 30 is provided on the timing pulley 20, the first end of the elastic member 41 is connected to the first cover plate 30, and the second end of the elastic member 41 is connected to the positioning pin 42. The elastic member 41 drives the positioning pin 42 to move in the operating area on the camshaft 10. The operating area is provided with multiple limiting holes. When the positioning pin 42 is located in at least one of the multiple limiting holes, the camshaft 10 and the timing pulley 20 stop relative rotation. In this way, by changing the relative position between the positioning pin 42 and the multiple limiting holes in the operating area, the camshaft 10 and the timing pulley 20 sleeved on the camshaft 10 can be adjusted at multiple angles, that is, the variable valve timing can be adjusted at multiple angles, thereby improving the adjustment flexibility.

[0047] The operating area can be an annular groove on the camshaft 10, the limiting hole is a through hole that passes through the bottom of the annular groove, the positioning pin 42 is matched with the annular groove, and the elastic member 41 drives the positioning pin 42 to rotate in the annular groove. When the positioning pin 42 is located in one of the multiple limiting holes, the relative rotation between the camshaft 10 and the timing pulley 20 stops, thereby achieving multi-angle adjustment between the camshaft 10 and the timing pulley 20. Specifically, the more limiting holes there are, the greater the accuracy of the angle adjustment. In addition, the number of positioning pins 42 can also be set to one, two, or more.

[0048] Optionally, the camshaft 10 includes a positioning column 11, a shaft body 12, and an intermediate body 13 disposed on the shaft body 12, and the timing pulley 20 is sleeved on the intermediate body 13;

[0049] The intermediate body 13 is provided with a first through hole, and the positioning post 11 passes through the first through hole and is connected to the shaft body 12 .

[0050] Among them, the positioning column 11 can be a bolt, and a first through hole compatible with the bolt is provided on the intermediate body 13. The intermediate body 13 is located at the end of the shaft body 12, and the timing pulley 20 is sleeved on the intermediate body 13. The bolt passes through the first through hole to fix the intermediate body 13 on the shaft body 12.

[0051] Optionally, the camshaft 10 further includes an oil sealing plate 14 provided on the intermediate body 13;

[0052] The oil sealing plate 14 , the first cover plate 30 and the timing pulley 20 form an accommodating cavity, and the intermediate body 13 is located in the accommodating cavity.

[0053] In this embodiment, the intermediate body 13 is isolated from the external environment by being arranged in the accommodation cavity formed by the oil sealing plate 14, the first cover plate 30 and the timing pulley 20, thereby reducing the risk of damage to the intermediate body 13 and improving reliability.

[0054] Optionally, the timing pulley 20 further includes a second cover plate 50 , the second cover plate 50 and the first cover plate 30 are arranged opposite to each other, and the oil sealing plate 14 is located between the second cover plate 50 and the intermediate body 13 ;

[0055] The oil sealing plate 14 is provided with a second through hole, the second cover plate 50 is provided with a third through hole, and the shaft 12 passes through the third through hole and the second through hole in sequence to connect with the intermediate body 13;

[0056] The vertical projection of the oil sealing plate 14 on the second cover plate 50 is located on the second cover plate 50 .

[0057] In a specific implementation, the central axes of the first cover plate 30 , the oil sealing plate 14 and the second cover plate 50 coincide with each other, and the shaft 12 passes through the second cover plate 50 , the oil sealing plate 14 and is connected to the intermediate body 13 in sequence.

[0058] Optionally, the intermediate body 13 divides the accommodating cavity into a first chamber and a second chamber, the limiting hole is located on the intermediate body 13, and the first chamber and the second chamber are connected through the limiting hole.

[0059] In this embodiment, the intermediate body 13 divides the accommodating chamber into a first chamber and a second chamber, and the first chamber and the second chamber are connected through a limiting hole passing through the intermediate body 13. Specifically, when the positioning pin 42 is located in the limiting hole, the first chamber and the second chamber are in a disconnected state. When the positioning pin 42 slides out of the limiting hole and is located in the gap between the intermediate body 13 and the first cover plate 30, the first chamber and the second chamber are in a connected state.

[0060] Optional, such as Figure 7 and Figure 8 As shown, the shaft body 12 is provided with an oil inlet 121 and an oil outlet 122 along the axial direction, and a first channel is provided in the shaft body 12, the first end of the first channel is connected to the oil inlet 121, the second end of the first channel is connected to the oil outlet 122, and the oil outlet 122 is connected to the first chamber.

[0061] In a specific implementation, the engine's high-pressure oil flows from the oil inlet 121 on the head of the camshaft 10 along the first channel from the oil outlet 122 into the first chamber between the oil sealing plate 14 and the intermediate body 13. Under the action of the oil pressure, the positioning pin 42 in the limiting hole is pressed out. At this time, the high-pressure oil pressure drops, and the oil supply to the head of the camshaft 10 stops. The pressed-out positioning pin 42 slides along the operating area and, under the action of the spring force, is stuck in the next limiting hole, thereby completing a timing angle adjustment.

[0062] Optionally, an oil unloading hole 141 is further provided on the oil sealing plate 14 , and an oil unloading channel is provided on the intermediate body 13 , wherein a first end of the oil unloading channel is connected to the second chamber, and a second end of the oil unloading channel is connected to the oil unloading hole 141 .

[0063] In a specific implementation, during the timing adjustment process, the engine oil entering the second chamber from the first chamber flows along the oil unloading channel provided on the intermediate body 13, flows out through the oil unloading hole 141 provided on the oil sealing plate 14, and finally flows out of the VVT mechanism.

[0064] The number of the oil unloading channels may be one, two or more, and the number of the oil unloading holes 141 is consistent with the number of the oil unloading channels.

[0065] Optionally, the plurality of limiting holes are evenly arranged around the first through hole, so that the adjustment of the timing angle is more uniform.

[0066] Optionally, a vertical projection of the oil sealing plate 14 on the intermediate body 13 is located on the intermediate body 13 .

[0067] The present application also provides a vehicle including the variable valve timing assembly described above. Since the technical solution of this embodiment includes all the technical solutions of the above embodiments, it can at least achieve all the technical effects of the above embodiments, and will not be described in detail here.

[0068] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A variable valve timing assembly, characterized in that: include: A camshaft, a timing pulley, a first cover plate, and a locking member provided on the first cover plate; The timing pulley is sleeved on the camshaft, and the timing pulley is connected to the engine; The first cover plate is arranged on the timing pulley; The locking member includes an elastic member and a positioning pin, wherein a first end of the elastic member is connected to the first cover plate, and a second end of the elastic member is connected to the positioning pin, and the elastic member drives the positioning pin to move in an operating area, which is an area on the camshaft; A plurality of limiting holes are provided on the operating area, and when the positioning pin is located in at least one of the plurality of limiting holes, the camshaft and the timing pulley stop rotating relative to each other; The camshaft includes a positioning column, a shaft body and an intermediate body arranged on the shaft body, and the timing pulley is sleeved on the intermediate body; The intermediate body is provided with a first through hole, and the positioning column passes through the first through hole and is connected to the shaft body; the camshaft further includes an oil sealing plate provided on the intermediate body; The oil sealing plate, the first cover plate and the timing pulley form a receiving cavity, and the intermediate body is located in the receiving cavity; The intermediate body divides the accommodating cavity into a first chamber and a second chamber, the limiting hole is located on the intermediate body, and the first chamber and the second chamber are connected through the limiting hole; The shaft body is provided with an oil inlet and an oil outlet along the axial direction, and a first channel is provided in the shaft body, the first end of the first channel is connected to the oil inlet, the second end of the first channel is connected to the oil outlet, and the oil outlet is connected to the first chamber.

2. The variable valve timing assembly according to claim 1, characterized in that: It also includes a second cover plate provided on the timing pulley, the second cover plate and the first cover plate are arranged opposite to each other, and the oil sealing plate is located between the second cover plate and the intermediate body; The oil sealing plate is provided with a second through hole, the second cover plate is provided with a third through hole, and the shaft passes through the third through hole and the second through hole in sequence to be connected to the intermediate body; The vertical projection of the oil sealing plate on the second cover plate is located on the second cover plate.

3. The variable valve timing assembly according to claim 1, characterized in that: The oil sealing plate is further provided with an oil unloading hole, and the intermediate body is provided with an oil unloading channel. The first end of the oil unloading channel is connected to the second chamber, and the second end of the oil unloading channel is connected to the oil unloading hole.

4. The variable valve timing assembly according to claim 1, characterized in that: The plurality of limiting holes are evenly arranged around the first through hole.

5. The variable valve timing assembly according to claim 3, characterized in that: The vertical projection of the oil sealing plate on the intermediate body is located on the intermediate body.

6. A vehicle, characterized in that: Comprising a variable valve timing assembly as described in any one of claims 1-5.

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