Engine and vehicle

Abstract

The invention discloses an engine and a vehicle, the engine comprises a holder, a rocker arm, a valve and a knob, the rotation axis of the holder and the rotation axis of the knob are parallel to the rotation axis of the rocker arm; the air valve is connected to the first end of the rocker arm; the knob is connected to the second end of the rocker arm; the retainer is connected with the middle part of the rocker arm, so that the rocker arm can rotate around the middle part; when the engine is in a starting mode, the knob can be kept at a first gear, so that the valve is kept in an open state. According to the engine and the vehicle, the knob is kept at the first gear, so that the air valve is kept in the open state, when the engine is started, the air valve is opened, compressed air can flow out of the air valve, compression pressure in a cylinder is reduced, and vibration is effectively relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and in particular to an engine and a vehicle. Background Art

[0002] The variable valve lift device in the engine includes main components such as retainers, rocker arms and valves. Its working principle is as follows: When the engine crankshaft rotates, the retainer also starts to rotate. The protruding part of the retainer that is off-center corresponds to the rocker arm, and the rocker arm corresponds to the valve. When the protruding part of the retainer rotates downward, the rocker arm below will move under the action of pressure, and then transmit the force transmitted by the retainer to the valve. At this time, the valve moves downward under the action of pressure to open the cylinder intake channel or exhaust channel. When the protruding part of the retainer turns upward after half a circle of movement, the valve will rise upward under the reaction force of the valve spring to complete the closing of the intake channel or exhaust channel.

[0003] However, when the motor reverses and starts the engine, there is no combustion inside the combustion chamber. If the compressed air is not discharged in time, it will easily lead to excessive pressure in the combustion chamber, causing vibration. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] The present invention provides an engine, comprising a retainer, a rocker arm, a valve and a knob, wherein the rotation axis of the retainer and the rotation axis of the knob are parallel to the rotation axis of the rocker arm; the valve is connected to the first end of the rocker arm; the knob is connected to the second end of the rocker arm; the retainer is connected to the middle part of the rocker arm so that the rocker arm can rotate around the middle part;

[0006] When the engine is in a starting mode, the knob can be kept in a first gear position to keep the valve open.

[0007] Exemplarily, when the engine is in the running mode, the knob can be kept in the second gear position and the valve is in the closed state.

[0008] Exemplarily, the engine further includes: a hydraulic support member, a first end of the hydraulic support member is connected to the second end of the rocker arm, and a second end of the hydraulic support member is connected to the knob.

[0009] Exemplarily, when the knob is in the first position, the distance from the rotation axis of the knob to the second end of the rocker arm is a first distance; when the knob is in the second position, the distance from the rotation axis of the knob to the second end of the rocker arm is a second distance, and the first distance is greater than the second distance; when the knob is rotated from the second position to the first position, the distance from the rotation axis of the knob to the second end of the rocker arm switches from the second distance to the first distance.

[0010] Exemplarily, the engine further includes: a retaining member shaft, the retaining member is mounted on the retaining member shaft, the rotation axis of the retaining member is the axis of the retaining member shaft, and when the retaining member shaft rotates, the retaining member rotates; a rocker arm shaft, the rocker arm is mounted on the rocker arm shaft, and the rotation axis of the rocker arm is the axis of the rocker arm shaft; a knob shaft, the knob is mounted on the knob shaft, the rotation axis of the knob is the axis of the knob shaft, and when the knob shaft rotates, the knob rotates; wherein the relative positions of the rocker arm shaft and the knob shaft are fixed.

[0011] Exemplarily, the engine further comprises: a rocker roller, wherein the rocker roller is mounted on the rocker shaft, and the rocker roller is in contact with the retaining member.

[0012] Exemplarily, the knob includes at least a first part and a second part, the first part and the second part are arranged in sequence along the rotation direction of the knob, the first part has a first radial length, the second part has a second radial length, and the first radial length is greater than the second radial length; when the knob is in a first gear position, the extension direction of the hydraulic support member coincides with or is parallel to the first part; when the knob is in a second gear position, the extension direction of the hydraulic support member coincides with or is parallel to the second radial length.

[0013] Exemplarily, the cross-section of the knob is a shape composed of a rectangle or a square in the middle and semicircles or arcs at both ends.

[0014] Exemplarily, the retaining member is a cam.

[0015] Exemplarily, the number of the retaining members, the rocker arms, the valves and the knobs is respectively plural, the plurality of retaining members are respectively arranged at intervals along the rotation axis of the retaining members, the plurality of rocker arms are respectively arranged at intervals along the rotation axis of the rocker arms, the plurality of knobs are respectively arranged at intervals along the rotation axis of the knobs, and the plurality of retaining members, the rocker arms, the valves and the knobs correspond to each other one by one.

[0016] Exemplarily, the engine further includes a crankshaft, a timing transmission device and a driving source, wherein the crankshaft is drivingly connected to the retaining member via the timing transmission device, the driving source is drivingly connected to the knob, and the driving source can rotate independently of the crankshaft.

[0017] The present invention also provides a vehicle, comprising the engine as described above.

[0018] According to the engine and vehicle provided by the present invention, the valve is kept open by keeping the knob in the first gear position. When the engine is started, the opening of the valve allows compressed air to flow out of the valve, reducing the compression pressure in the cylinder and effectively alleviating vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0020] In the attached figure:

[0021] Figure 1 is a schematic structural diagram of an engine according to an embodiment of the present invention;

[0022] Figure 2 is a front view of an engine according to an embodiment of the present invention;

[0023] Figure 3 1 is a valve timing diagram according to an embodiment of the present invention.

[0024] Reference numerals

[0025] 1. Retaining shaft 2. Rocker arm

[0026] 3. Hydraulic support 4. Knob shaft

[0027] 5. Valve 6. Valve spring upper seat

[0028] 7. Spring 8. Valve guide

[0029] 9. Rocker shaft 10. Retaining piece

[0030] 11. Rocker roller 12. Knob DETAILED DESCRIPTION

[0031] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0032] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0033] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0034] In order to fully understand the present invention, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0035] In view of the problem in the prior art that the valve cannot remain open to discharge the compressed air in time when the motor reverses the engine to start, one solution is to directly adjust the position of the knob shaft during the startup phase, thereby adjusting the distance between the knob shaft and the rocker arm shaft to achieve different valve lifts. However, moving the knob shaft is prone to errors and the driving components are complex, interference between components is prone to occur, and the spatial layout also needs to be replanned, resulting in high overall costs.

[0036] The present invention provides an engine, such as Figure 1 and Figure 2 As shown, it includes: a retaining member 10, a rocker arm 2, a valve 5 and a knob 12, the rotation axis of the retaining member 10 and the rotation axis of the knob 12 are parallel to the rotation axis of the rocker arm 2; the valve 5 is connected to the first end of the rocker arm 2; the knob 12 is connected to the second end of the rocker arm 5; the retaining member 10 is connected to the middle part of the rocker arm 5 so that the rocker arm 5 can rotate around the middle part; when the engine is in the starting mode, the knob 12 can be kept in the first gear position to keep the valve 5 in an open state.

[0037] According to the engine provided by the present invention, the valve 5 is kept in an open state by keeping the knob 12 in the first gear position. When the engine is started, the opening of the valve allows compressed air to flow out of the valve, reducing the compression pressure in the cylinder and effectively alleviating vibration.

[0038] In one embodiment, the retaining member 10 includes but is not limited to a cam, the valve 5 includes but is not limited to an intake valve, and the middle portion of the rocker arm refers to other portions except the first end and the second end. Figure 1 As shown, the number of the retainer 10, the rocker arm 2, the valve 5 and the knob 12 is respectively plural, and the number of the retainer 10, the rocker arm 2, the valve 5 and the knob 12 is consistent. The plurality of retainers are respectively arranged at intervals along the rotation axis of the retainer, the plurality of rocker arms are respectively arranged at intervals along the rotation axis of the rocker arm, the plurality of knobs are respectively arranged at intervals along the rotation axis of the knob, and the plurality of retainers, the rocker arms, the valves and the knobs correspond to each other one by one.

[0039] Exemplarily, the engine provided by the present invention also includes: a retaining member shaft 1, the retaining member 10 is installed on the retaining member shaft, the rotation axis of the retaining member is the axis of the retaining member shaft, and when the retaining member shaft rotates, the retaining member rotates; a rocker arm shaft 9, the rocker arm 2 is installed on the rocker arm shaft, and the rotation axis of the rocker arm is the axis of the rocker arm shaft; a knob shaft 4, the knob 12 is installed on the knob shaft, the rotation axis of the knob is the axis of the knob shaft, and when the knob shaft rotates, the knob rotates; wherein the relative position of the retaining member shaft 1 and the knob shaft 4 is fixed.

[0040] In one embodiment, the engine provided by the present invention comprises a retainer shaft 1, a rocker shaft 9 and a knob shaft 4 arranged in parallel, that is, the axes of the retainer shaft 1, the rocker shaft 9 and the knob shaft 4 are parallel and not coaxial. The number of the retainer shaft 1 and the knob shaft 4 is the same. Figure 1 In the illustrated embodiment, the number of the retaining member shaft 1 and the number of the knob shaft 4 are both one; the number of the rocker arm shafts 9 is consistent with the number of the rocker arms 2, that is, each rocker arm 2 has a separate rocker arm shaft 9. The spacing between the retaining member shaft 1, the rocker arm shaft 9 and the knob shaft 4 can be selected according to the size and position of the parts on the retaining member shaft 1, the rocker arm shaft 9 and the knob shaft 4. The present invention does not limit this. It should be noted that the distance between the retaining member shaft 1 and the knob shaft 4 is fixed, that is, the retaining member shaft 1 and the knob shaft 4 cannot move relative to each other. In the embodiment of the present invention, the retaining member shaft 1 and the knob shaft 4 are both fixedly arranged and can only rotate around the axis but cannot move as a whole.

[0041] In one embodiment, a retaining member 10 is disposed on the retaining member shaft 1, and the retaining member 10 is relatively fixedly disposed with respect to the retaining member shaft 1, that is, the retaining member 10 cannot rotate around the retaining member shaft 1, and the retaining member shaft 1 can drive the retaining member 10 to rotate when it rotates. For example, the retaining member 10 is welded on the retaining member shaft 1, or the retaining member 10 and the retaining member shaft 1 are integrally formed, or the retaining member 10 is fixedly connected to the retaining member shaft 1 via a spline. It should be noted that a plurality of retaining members 10 are usually disposed on the retaining member shaft 1, such as Figure 1 By arranging a plurality of retainers 10 on the retainer shaft 1, when the retainer shaft 1 is driven, the plurality of retainers 10 are simultaneously driven to rotate, thereby improving the efficiency of the engine.

[0042] In one embodiment, a knob 12 is disposed on the knob shaft 4, and the knob 12 is fixedly disposed relative to the knob shaft 4, that is, the knob 12 cannot rotate around the knob shaft 4, and the knob 12 can be driven to rotate when the knob shaft 4 rotates. The knob shaft 4 is usually provided with a plurality of knobs 12, such as Figure 1 By arranging a plurality of knobs 12 on the knob shaft 4, when the knob shaft 4 is driven, the plurality of knobs 12 are driven to rotate at the same time, thereby improving the efficiency of the engine.

[0043] In one embodiment, a rocker arm 2 and a rocker arm roller 11 are provided on the rocker arm shaft 9. The rocker arm 2 can rotate around the rocker arm shaft 9. For example, when the second end of the rocker arm 2 rises, the first end of the rocker arm 2 sinks, and when the second end of the rocker arm 2 lowers, the first end of the rocker arm 2 rises; the rocker arm roller 11 contacts the retaining member 10, and when the protruding part of the retaining member 10 rotates to the rocker arm roller 11, the rocker arm 2 moves in a direction away from the retaining member 10 under the action of pressure.

[0044] Exemplarily, the engine has a starting mode and an operating mode: the knob can be maintained in the first gear position when the engine is in the starting mode, and the knob can be maintained in the second gear position when the engine is in the operating mode; when the knob is in the first gear position, the valve is in an open state; when the knob is in the second gear position, the valve is in a closed state.

[0045] Exemplarily, when the knob is in the first position, the distance from the rotation axis of the knob to the second end of the rocker arm is a first distance; when the knob is in the second position, the distance from the rotation axis of the knob to the second end of the rocker arm is a second distance, and the first distance is greater than the second distance.

[0046] Exemplarily, the engine further includes a crankshaft, a timing transmission device and a driving source, wherein the crankshaft is drivingly connected to the retaining member via the timing transmission device, and the driving source is drivingly connected to the knob.

[0047] In one embodiment, the retainer shaft 1 and the knob shaft 4 are both input power shafts, and the controller can control the transmission system to drive according to the operating conditions of the engine. For example, when the engine enters the operating mode, the crankshaft drives the retainer shaft 1 to rotate continuously through the timing transmission device, thereby driving the retainer 10 to rotate; since the retainer 10 is in contact with the middle of the rocker arm 2, for example, the retainer 10 is in contact with the rocker arm roller 11, when the protruding part of the retainer 10 rotates to the bottom, the rocker arm 2 moves downward under the action of pressure, driving the valve 5 to move downward under the action of pressure, and opening the cylinder intake channel or exhaust channel. When the engine enters the starting mode, the driving source drives the knob shaft 4 to rotate a preset angle (for example, 90°) and then keeps the knob 12 in the first gear position, so that the distance from the knob shaft 4 to the second end of the rocker arm 2 is the first distance, and the valve 5 is in the open state at this time; when the engine is switched to the running mode (also known as the normal mode), the driving source drives the knob shaft 4 to rotate a preset angle (for example, 90°) and then keeps the knob 12 in the second gear position, so that the distance from the knob shaft 4 to the second end of the rocker arm 2 is the second distance, and at this time, the opening and closing of the valve 5 is only determined by the rotation of the retaining member 10, and has nothing to do with the knob 12. In this embodiment, the rotation of the driving source is independent of the crankshaft, so the rotation of the knob is not affected by the crankshaft, so that when the engine is in the starting mode, the knob can be kept in the first gear position, so that the valve can be kept in the open state for the compressed gas to be discharged. Similarly, when the engine is in the running mode, the knob can be kept in the second gear position, so that the knob no longer affects the opening or closing of the valve.

[0048] The engine provided according to the present invention has a starting mode and an operating mode. In the starting mode, the knob 12 is kept in the first gear position to keep the valve 5 in an open state. When the engine starts, the opening of the valve allows compressed air to flow out of the valve, reducing the compression pressure in the cylinder and effectively alleviating vibration. In the operating mode, the knob 12 is kept in the second gear position, and the valve 5 repeatedly switches between the open state and the closed state as the retaining member 10 rotates to ensure the normal operation of the engine.

[0049] Exemplarily, the engine further includes a hydraulic support member 3, a first end of which is connected to the second end of the rocker arm 2, and a second end of which is connected to the knob 12. In one embodiment, the length of the hydraulic support member 3 can be set as needed, but the length of the hydraulic support member 3 is a fixed value and cannot be changed. The hydraulic support member 3 is not used to change the distance from the knob shaft 4 to the second end of the rocker arm 2. The function of the hydraulic support member 3 is to drive the second end of the rocker arm 2 to rise or fall when the knob 12 is rotated (i.e., the gear is switched), and eliminate the gap between the second end of the rocker arm 2 and the knob 12.

[0050] In one embodiment, the valve 5 includes a valve spring upper seat 6, a valve spring 7 and a valve guide 8. The valve spring 7 is used to ensure that the valve is seated in time and fits tightly, so as to prevent the valve from jumping when the engine vibrates and destroying its sealing. The valve spring upper seat 6 is used to install and position the valve spring 7. The valve guide 8 is used to guide the movement of the valve, ensure that the valve makes reciprocating linear motion, and transfer the heat of the valve stem to the cylinder head. The valve 5 moves downward to open the cylinder, and the valve 5 moves upward to close the cylinder. When the protruding part of the retaining member 10 rotates to the bottom, the rocker arm 2 moves downward under the action of pressure, driving the valve 5 to move downward under the action of pressure, and opening the cylinder intake channel or exhaust channel. When the knob 12 is rotated from the second gear to the first gear, the second end of the rocker arm 2 rises, and the first end of the rocker arm 2 sinks, driving the valve 5 to move downward, and opening the cylinder intake channel or exhaust channel.

[0051] Exemplarily, when the knob is rotated from the second gear position to the first gear position, the distance from the rotation axis of the knob to the second end of the rocker arm switches from the second distance to the first distance.

[0052] Exemplarily, the knob 12 includes at least a first part and a second part, the first part and the second part are arranged in sequence along the rotation direction of the knob, the first part has a first radial length, the second part has a second radial length, and the first radial length is greater than the second radial length; when the knob 12 is in the first gear position, the extension direction of the hydraulic support 3 coincides with or is parallel to the first part; when the knob 12 is in the second gear position, the extension direction of the hydraulic support 3 coincides with or is parallel to the second radial length.

[0053] In one embodiment, the knob 12 includes a first portion having a first radial length and a second portion having a second radial length, for example, the knob 12 is an elliptical cylinder. The driving source drives the knob shaft 4 to rotate, driving the knob 12 to rotate. When the extension direction of the hydraulic support 3 coincides with or is parallel to the first portion of the knob 12, the distance from the knob shaft to the second end of the rocker arm 2 reaches a first distance, wherein the first distance may be the maximum distance from the knob shaft to the second end of the rocker arm 2; the driving source drives the knob shaft 4 to rotate, driving the knob 12 to rotate. When the extension direction of the hydraulic support 3 coincides with or is parallel to the second portion of the knob 12, the distance from the knob shaft to the second end of the rocker arm 2 reaches a second distance, wherein the second distance may be the minimum distance from the knob shaft to the second end of the rocker arm 2. The difference between the first radial length and the second radial length of the knob 12 is approximately 2 mm to 3 mm, therefore, the difference between the first distance and the second distance is also 2 mm to 3 mm.

[0054] Exemplarily, the cross-section of the knob 12 is a shape composed of a rectangle or square in the middle and semicircles or arcs at both ends. When the cross-section of the knob is a rectangle or square in the middle, it provides stable support for the hydraulic support member.

[0055] In one embodiment, the cross section of the knob 12 is a shape composed of a rectangle or square in the middle and semicircles or arcs at both ends. When the engine is in the running mode, the middle of the rocker arm 2 is acted upon by the retaining member 10, and the rocker arm 2 as a whole frequently rotates around the second end of the rocker arm within a certain angle range, which will generate certain vibrations. By making the cross section of the knob 12 rectangular or square in the middle, the contact surface between the hydraulic support member 3 and the knob 12 is large, the hydraulic support member 3 can be firmly supported on the knob 12, and the axial displacement of the hydraulic support member 3 will not occur in the case of vibration, so as to ensure that the opening and closing positions of the valves in the running mode meet expectations.

[0056] It should be noted that the change in the distance from the knob shaft 4 to the second end of the rocker arm 2 includes a linear change or a nonlinear change. In the embodiment of the present invention, since the valve 5 only needs to be kept in an open state during the engine startup phase, the first part and the second part of the knob 12 can be switched only by driving the knob shaft 4 to rotate 90°, so that the distance from the knob shaft 4 to the second end of the rocker arm 2 is switched from the first distance to the second distance or from the second distance to the first distance. However, when it is necessary to control the degree of valve opening to different degrees, for example, it is necessary to control the intake or exhaust volume of the valve, the change in the distance from the knob shaft to the second end of the rocker arm includes rotating the knob shaft 4 so that the distance from the knob shaft 4 to the second end of the rocker arm 2 is any value between the first distance and the second distance, that is, the distance from the knob shaft 4 to the second end of the rocker arm 2 changes linearly; the change in the distance from the knob shaft to the second end of the rocker arm also includes rotating the knob shaft 4 so that the distance from the knob shaft 4 to the second end of the rocker arm 2 is several fixed values ​​between the first distance and the second distance, that is, the distance from the knob shaft 4 to the second end of the rocker arm 2 changes nonlinearly.

[0057] The working process of the engine provided by the present invention includes: when the engine is not working, the knob 12 is in Figure 2As shown in the second gear position, the extension direction of the hydraulic support member 3 coincides with the second part of the knob 12, the distance from the knob shaft 4 to the second end of the rocker arm 2 is the second distance, and the valve 5 is in a closed state. When the engine is started, the crankshaft drives the retaining member shaft 1 to rotate continuously through the timing transmission device, and the driving source drives the knob shaft 4 to rotate 90°, so that the knob 12 changes to the first gear position. At this time, the extension direction of the hydraulic support member 3 coincides with the first part of the knob 12, the distance from the knob shaft 4 to the second end of the rocker arm 2 is the first distance, and the hydraulic support member 3 moves upward by 2 to 3 mm under the action of the knob 12. The second end of the rocker arm 2 is lifted up by the hydraulic support member 3 by 2 to 3 mm, and the rocker arm 2 rotates around the rocker arm shaft 9. The first end of the rocker arm 2 sinks, driving the valve 5 to move downward, and the valve 5 opens. At this time, the opening and closing of the valve 5 is not affected by the rotation of the retaining member 10 and remains in an open state. The valve timing at this time is as shown in FIG. Figure 3 As shown in the middle curve ③, when the cylinder runs to the compression stroke, the air is compressed and the air can flow out from the valve. The actual compression ratio of the combustion chamber is low, the compression pressure is small, and the vibration is small. When the engine is dragged backward to more than 800rpm, the engine enters the running state from the starting state, and the crankshaft still drives the retaining member shaft 1 to rotate continuously through the timing transmission device. The driving source drives the knob shaft 4 to rotate 90°, so that the knob 12 changes to the second gear. At this time, the extension direction of the hydraulic support member 3 coincides with the second part of the knob 12, and the distance from the knob shaft 4 to the second end of the rocker arm 2 is the second distance. The hydraulic support member 3 moves downward by 2 to 3 mm under the action of the knob 12, and the second end of the rocker arm 2 moves downward by 2 to 3 mm. The rocker arm 2 rotates around the rocker arm shaft 9, and the first end of the rocker arm 2 rises, driving the valve 5 to move upward. At this time, the opening and closing of the valve 5 is only affected by the rotation of the retaining member 10. The valve timing at this time is as shown in Figure 3 As shown in the middle curve ②.

[0058] The present invention also provides a vehicle, comprising the engine as described above.

[0059] According to the engine and vehicle provided by the present invention, the valve is kept open by keeping the knob in the first gear position. When the engine is started, the opening of the valve allows compressed air to flow out of the valve, reducing the compression pressure in the cylinder and effectively alleviating vibration.

[0060] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An engine, characterized in that: The invention comprises a retainer, a rocker arm, a valve and a knob, wherein the rotation axis of the retainer and the rotation axis of the knob are parallel to the rotation axis of the rocker arm; the valve is connected to the first end of the rocker arm; the knob is connected to the second end of the rocker arm; the retainer is connected to the middle part of the rocker arm so that the rocker arm can rotate around the middle part; When the engine is in a starting mode, the knob can be kept in a first gear position to keep the valve open.

2. The engine according to claim 1, characterized in that When the engine is in a running mode, the knob can be kept in the second gear position and the valve is in a closed state.

3. The engine according to claim 2, characterized in that Also includes: A hydraulic support member, a first end of the hydraulic support member is connected to the second end of the rocker arm, and a second end of the hydraulic support member is connected to the knob.

4. The engine according to claim 2, characterized in that When the knob is in the first gear position, the distance from the rotation axis of the knob to the second end of the rocker arm is a first distance; when the knob is in the second gear position, the distance from the rotation axis of the knob to the second end of the rocker arm is a second distance, and the first distance is greater than the second distance; When the knob is rotated from the second gear position to the first gear position, the distance from the rotation axis of the knob to the second end of the rocker arm switches from the second distance to the first distance.

5. The engine according to claim 1, characterized in that Also includes: A retainer shaft, the retainer is mounted on the retainer shaft, the rotation axis of the retainer is the axis of the retainer shaft, and when the retainer shaft rotates, the retainer rotates; A rocker shaft, the rocker arm is mounted on the rocker shaft, and the rotation axis of the rocker arm is the axis of the rocker shaft; A knob shaft, the knob is mounted on the knob shaft, the rotation axis of the knob is the axis of the knob shaft, and when the knob shaft rotates, the knob rotates; Wherein, the relative positions of the retaining member axis and the knob axis are fixed.

6. The engine according to claim 5, characterized in that Also includes: A rocker roller is mounted on the rocker shaft and is in contact with the retaining member.

7. The engine according to claim 3, characterized in that The knob comprises at least a first part and a second part, the first part and the second part are sequentially arranged along the rotation direction of the knob, the first part has a first radial length, the second part has a second radial length, and the first radial length is greater than the second radial length; When the knob is in the first gear position, the extension direction of the hydraulic support member coincides with or is parallel to the first portion; when the knob is in the second gear position, the extension direction of the hydraulic support member coincides with or is parallel to the second portion.

8. The engine according to claim 1, characterized in that The cross section of the knob is a shape composed of a rectangle or a square in the middle and semicircles or arcs at both ends.

9. The engine according to claim 1, characterized in that The retaining member is a cam.

10. The engine according to claim 1, characterized in that The number of the retaining members, the rocker arms, the valves and the knobs is respectively plural, the retaining members are respectively arranged at intervals along the rotation axis of the retaining members, the rocker arms are respectively arranged at intervals along the rotation axis of the rocker arms, the knobs are respectively arranged at intervals along the rotation axis of the knobs, and the retaining members, the rocker arms, the valves and the knobs correspond to each other one by one.

11. The engine according to claim 1, characterized in that It also includes a crankshaft, a timing transmission device and a driving source. The crankshaft is drivingly connected to the retaining member through the timing transmission device, the driving source is drivingly connected to the knob, and the driving source can rotate independently of the crankshaft.

12. A vehicle, characterized in that: An engine comprising any one of claims 1-11.

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