Cylinder device and reciprocating piston internal combustion engine

Abstract

The invention provides an air cylinder device which comprises an air cylinder, an air valve and a combined rocker arm mechanism. The combined rocker arm mechanism comprises a shaft seat, a rotating shaft, a branch rocker arm, a main rocker arm and an adjusting mechanism; the rotating shaft is rotatably arranged on the shaft seat; the support rocker arm is provided with a first end part and a second end part, the first end part is matched with the cam, and the second end part is fixedly connected to the rotating shaft; the main rocker arm is provided with a third end and a fourth end, the third end is used for pressing the other end, extending out of the cylinder cover, of the valve, the fourth end is located on the side, back to the valve, of the first end at intervals, and the middle of the main rocker arm is rotationally connected to the rotating shaft; the adjusting mechanism comprises a gear, a toothed bar and a cushion block, the gear rotatably sleeves the rotating shaft and is driven by the adjusting driving mechanism, one end part of the toothed bar is meshed with the gear, and the other end part of the toothed bar extends and is connected to the cushion block cushioned between the first end part and the fourth end part; the adjusting mechanism drives the gear to drive the toothed bar and the cushion block to move, the distance between the first end and the fourth end is adjusted, and therefore the valve lift is adjusted.

Description

Technical Field

[0001] This invention relates to the field of reciprocating piston internal combustion engine technology, and more particularly to a cylinder assembly and a reciprocating piston internal combustion engine. Background Technology

[0002] For reciprocating piston internal combustion engines used in automobiles, the cam profile of the traditional camshaft and the structure of the valve train are fixed. This results in a fixed and unchangeable variation in the valve lift curve relative to the crankshaft angle. However, automotive internal combustion engines operate over a wide range of conditions with dramatic speed variations, ranging from tens of thousands of RPM to only a few hundred RPM. This fixed valve lift curve often only achieves optimal intake and exhaust performance under specific engine speed conditions, and this lift cannot provide a good response at both high and low speeds. This cam profile design represents a balance choice for the engine under all operating conditions. As a result, the engine does not achieve optimal high-speed efficiency or optimal low-speed torque. Variable valve lift mechanisms can adjust valve lift according to changes in engine speed, enabling the engine to achieve the required valve lift in both high and low speed ranges, thereby improving high-speed power and low-speed torque. However, existing variable valve lift schemes use hydraulic methods to adjust the lift, which places high demands on the hydraulic system. Changes in the temperature and quality of the hydraulic oil directly affect the accuracy of valve lift control, making it difficult to achieve precise control of valve lift. Summary of the Invention

[0003] A primary objective of this invention is to overcome at least one of the deficiencies of the prior art and to provide a cylinder device with a highly accurate valve lift adjustment function.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] According to one aspect of the present invention, a cylinder assembly is provided for mounting in a reciprocating piston internal combustion engine. The cylinder assembly includes a cylinder, valves, and a combined rocker arm mechanism. The valves extend along a first direction and pass through the cylinder head of the cylinder. One end of the valve is located within the cylinder head and is used to block or open the vent of the cylinder head, while the other end of the valve extends out of the cylinder head. The combined rocker arm mechanism includes a bearing, a rotating shaft, a rocker arm support, a main rocker arm, and an adjusting mechanism. The rotating shaft extends along a second direction and is rotatably mounted on the bearing, the second direction being perpendicular to the first direction. The rocker arm support has a first end and a second end, the first end cooperating with a cam, and the second end fixedly connected to the rotating shaft. The main rocker arm has a third end and a fourth end. The fourth end is located at a distance from the first end on the side opposite to the valve in the first direction, and the main rocker arm is rotatably connected to the rotating shaft at its center. A first return elastic element is connected between the main rocker arm and the shaft seat. The adjusting mechanism includes a gear, a rack, and a pad. The gear is rotatably mounted on the rotating shaft and driven by the adjusting drive mechanism. One end of the rack meshes with the gear, and the other end extends between the first end and the fourth end. The pad is fixed to the other end of the rack and is placed between the first end and the fourth end. The adjusting mechanism is configured to adjust the distance between the first end and the fourth end by driving the gear to rotate, thereby adjusting the valve lift.

[0006] According to one embodiment of the present invention, the pad is wedge-shaped, and the two sides of the pad in the first direction respectively cooperate with the two opposing sides of the first end and the fourth end.

[0007] According to one embodiment of the present invention, the pad is provided with a first through hole extending along a third direction, the third direction being perpendicular to the first direction and perpendicular to the second direction; the toothed rod extends along the third direction, one end of the toothed rod passing through the first through hole, a fixing member is provided in the first through hole, and the fixing member fixably connects the toothed rod and the pad.

[0008] According to one embodiment of the present invention, the inner diameter of the first through hole is greater than the height of the toothed rod in the first direction; wherein, the fixing member is a pin, the pin passes through one end of the toothed rod, and both ends of the pin are respectively fixedly connected to the pad, and one end of the toothed rod can slide along the pin to generate relative displacement with the pad in the first direction.

[0009] According to one embodiment of the present invention, the adjustment drive mechanism includes a drive sleeve and a drive motor. The drive sleeve is sleeved on the rotating shaft, the gear is disposed on the drive sleeve, and the drive motor is used to drive the drive sleeve to rotate around the rotating shaft, so as to drive the gear to rotate.

[0010] According to one embodiment of the present invention, the rocker arm has a second through hole extending along a third direction, the third direction being perpendicular to the first direction and perpendicular to the second direction. The rack extends along the third direction and passes through the second through hole. One end of the rack extends out of the second through hole and is connected to the pad block. The second through hole is located in the portion of the rocker arm between the rotating shaft and the main rocker arm. The second end has a shaft cavity for accommodating the gear and the rotating shaft. The second through hole has an opening and communicates with the shaft cavity through the opening. The rack portion is exposed through the opening and meshes with the gear.

[0011] According to one embodiment of the present invention, the first reset elastic element is a coil spring.

[0012] According to one embodiment of the present invention, the bearing seat is fixed to the cylinder head.

[0013] According to one embodiment of the present invention, a second reset elastic member is connected between the end of the valve extending out of the cylinder head and the cylinder head.

[0014] As can be seen from the above technical solution, the advantages and positive effects of the cylinder device proposed in this invention are as follows:

[0015] The cylinder device proposed in this invention includes a cylinder, a valve, and a combined rocker arm mechanism. The combined rocker arm mechanism includes a bearing seat, a rotating shaft, a rocker arm support, a main rocker arm, and an adjustment mechanism. The rotating shaft is rotatably mounted on the bearing seat. The rocker arm support has a first end and a second end. The first end engages with a cam, and the second end is fixedly connected to the rotating shaft. The main rocker arm has a third end and a fourth end. The third end is used to press against the other end of the valve extending from the cylinder head, and the fourth end is located at intervals on the side of the first end facing away from the valve. The main rocker arm is rotatably connected to the rotating shaft at its center. The adjustment mechanism includes a gear, a rack, and a pad. The gear is rotatably mounted on the rotating shaft and driven by the adjustment drive mechanism. One end of the rack meshes with the gear, and the other end extends and connects to the pad placed between the first end and the fourth end. The adjustment mechanism drives the gear to move the rack and the pad, adjusting the distance between the first end and the fourth end, thereby adjusting the valve lift. Through the above design, by utilizing the action-coordinate relationship of gear driving rack movement and driving pad movement, the present invention can adjust the position of the pad placed between the rocker arm support and the main rocker arm, thereby adjusting the relative position angle between the rocker arm support and the main rocker arm. This causes the combined rocker arm mechanism composed of the rocker arm support and the main rocker arm to change shape when not pushed by the cam convex part, that is, the distance between the third end of the main rocker arm and the valve changes. This achieves the adjustment of the initial relative position between the combined rocker arm mechanism and the valve, thus realizing the function of variable valve lift. Compared with the existing solution of hydraulic lift adjustment, the present invention uses the above-mentioned mechanical adjustment scheme, which reduces the design requirements of the hydraulic drive part and can improve the control stability and accuracy of the valve lift adjustment function.

[0016] Another major objective of the present invention is to overcome at least one of the defects of the prior art described above and to provide a reciprocating piston internal combustion engine employing the cylinder assembly described above.

[0017] To achieve the above objectives, the present invention adopts the following technical solution:

[0018] According to another aspect of the present invention, a reciprocating piston internal combustion engine is provided, wherein the cylinder assembly proposed in the present invention and described in the above embodiments is included.

[0019] As can be seen from the above technical solution, the advantages and positive effects of the reciprocating piston internal combustion engine proposed in this invention are as follows:

[0020] The reciprocating piston internal combustion engine proposed in this invention, by adopting the cylinder device proposed in this invention, can realize the function of variable valve lift and improve the control stability and accuracy of valve lift adjustment function. Attached Figure Description

[0021] Various objects, features, and advantages of the invention will become more apparent from the following detailed description of preferred embodiments of the invention, taken in conjunction with the accompanying drawings. The drawings are merely illustrative of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0022] Figures 1 to 4 These are cross-sectional views of a cylinder assembly in several different states, according to an exemplary embodiment.

[0023] Figure 5 yes Figure 1 The diagram shows the arrangement of the adjusting drive mechanism and the first reset elastic element of the cylinder device.

[0024] The annotations in the attached figures are explained as follows:

[0025] 110. Cylinder head; 242. Fourth end;

[0026] 111. Vent; 243. First reset elastic element;

[0027] 120. Valve; 251. Gear;

[0028] 121. Second reset elastic element; 252. Tooth bar;

[0029] 200. Modular rocker arm mechanism; 253. Pad block;

[0030] 210. Shaft seat; 2531. First through hole;

[0031] 220. Shaft; 2532. Fixture;

[0032] 230. Rocker arm support; 254. Drive sleeve;

[0033] 231. First end; 255. Drive motor;

[0034] 232. Second end; 310. Drive shaft;

[0035] 233. Second through hole; 311. Cam;

[0036] 234. Shaft cavity; X. First direction;

[0037] 240. Main rocker arm; Y. Second direction;

[0038] 241. Third end; Z. Third direction. Detailed Implementation

[0039] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the description and drawings therein are for illustrative purposes only and not intended to limit the present invention.

[0040] In the following description of different exemplary embodiments of the invention, reference is made to the accompanying drawings, which form part of the invention, and in which different exemplary structures, systems, and steps that can implement various aspects of the invention are shown by way of example. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the invention. Furthermore, although the terms “above,” “between,” “within,” etc., may be used in this specification to describe different exemplary features and elements of the invention, these terms are used herein only for convenience, such as the orientation according to the examples shown in the drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the invention.

[0041] See Figure 1 This illustration shows a representative cross-sectional view of a portion of the cylinder device proposed in this invention. Specifically, it shows the cross-sectional structure of the cylinder device with the valve 120 in the closed state (i.e., the head of the valve 120 blocking the vent 111 of the cylinder head 110), while the cylinder block and other structures are omitted. In this exemplary embodiment, the cylinder device proposed in this invention is described using a reciprocating piston internal combustion engine for automobiles as an example. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the following specific embodiments to apply the relevant designs of this invention to other types of reciprocating piston internal combustion engines, and these changes remain within the scope of the principles of the cylinder device proposed in this invention.

[0042] like Figure 1 As shown, in one embodiment of the present invention, the cylinder device proposed in this invention is used in a reciprocating piston internal combustion engine. The cylinder device includes a cylinder, a valve 120, and a combined rocker arm mechanism 200. (See also...) Figures 2 to 5 , Figures 2 to 4 The images show representative cross-sectional views of parts of the cylinder assembly in other configurations, where... Figure 2 Specifically, the cylinder assembly is shown in Figure 1 The diagram shows a cross-sectional view of valve 120 when it is open during the stroke. Figure 3 Specifically, a cross-sectional view is shown when the cylinder assembly is adjusted to close valve 120 for another stroke. Figure 4 Specifically, the cylinder assembly is shown in Figure 3 The cross-sectional view shown is of valve 120 when it is open during the stroke. Figure 5 The diagram shows a representative arrangement of the adjusting drive mechanism and the first reset elastic element 243. The structure, connection method, and functional relationship of the main components of the cylinder device proposed in this invention will be described in detail below with reference to the above-mentioned drawings.

[0043] like Figures 1 to 4As shown, in one embodiment of the present invention, the valve 120 extends along a first direction X and passes through the cylinder head 110 of the cylinder. One end of the valve 120 is located inside the cylinder head 110 and is used to block or open the vent 111 of the cylinder head 110, while the other end of the valve 120 extends out of the cylinder head 110. The combined rocker arm mechanism 200 includes a bearing 210, a rotating shaft 220, a rocker arm support 230, a main rocker arm 240, and an adjustment mechanism. The rotating shaft 220 extends along a second direction Y and is rotatably disposed on the bearing 210, the second direction Y being perpendicular to the first direction X. The rocker arm support 230 has a first end 231 and a second end 232. The first end 231 cooperates with a cam 311, which can be disposed on a drive shaft 310. The second end 232 is fixedly connected to the rotating shaft 220. The main rocker arm 240 has a third end 241 and a fourth end 242. The third end 241 is used to press against the other end of the valve 120 extending from the cylinder head 110. The fourth end 242 is located at a distance from the first end 231 on the side opposite to the valve 120 along the first direction X. The main rocker arm 240 is rotatably connected to the rotating shaft 220 at its middle portion (i.e., the portion of the main rocker arm 240 located between the third end 241 and the fourth end 242). A first reset elastic member 243 is connected between the main rocker arm 240 and the bearing seat 210. Accordingly, the present invention can use the first reset elastic member 243 to keep the combined rocker arm mechanism 200 composed of the support rocker arm 230, the pad 253, and the main rocker arm 240 in a tightly fitted state, and to keep the support rocker arm 230 in contact with the cam 311 at all times. The adjustment mechanism includes a gear 251, a rack 252, and a pad 253. The gear 251 is rotatably mounted on the shaft 220 and driven by an adjustment drive mechanism. One end of the rack 252 meshes with the gear 251, and the other end of the rack 252 extends between the first end 231 of the rocker arm 230 and the fourth end 242 of the main rocker arm 240. The pad 253 is fixed to the other end of the rack 252 and is placed between the first end 231 and the fourth end 242. Accordingly, the adjustment mechanism can drive the rack 252 and the pad 253 to move by rotating the gear 251, thereby adjusting the distance between the first end 231 and the fourth end 242, thus achieving adjustment of the valve lift 120.Through the above design, by utilizing the action-coupling relationship of the gear 251 driving the rack 252 to move and causing the pad 253 to move, the present invention can adjust the position of the pad 253 placed between the rocker arm 230 and the main rocker arm 240, thereby adjusting the relative position angle between the rocker arm 230 and the main rocker arm 240. This causes the combined rocker arm mechanism 200 composed of the rocker arm 230 and the main rocker arm 240 to change its shape when it is not pushed by the protrusion of the cam 311, that is, the distance between the third end 241 of the main rocker arm 240 and the valve 120 changes. This achieves the adjustment of the initial relative position between the combined rocker arm mechanism 200 and the valve 120, thus realizing the function of variable valve lift. Compared with the existing solution of hydraulic lift adjustment, the present invention uses the above-mentioned mechanical adjustment scheme, which reduces the design requirements of the hydraulic drive part and can improve the control stability and accuracy of the valve lift adjustment function.

[0044] Specifically, such as Figures 1 to 4 As shown in the figures, comparing the structures shown in the two sets of figures, it can be seen that when the combined rocker arm mechanism 200 is adjusted to two different valve lifts, the ventilation gap between the valve 120 and the vent 111 is different in the open state. This achieves the adjustment of the ventilation volume, thereby meeting the ventilation requirements of the internal combustion engine in the high-speed and low-speed ranges by adjusting the corresponding valve 120, thus improving the high-speed power and low-speed torque of the internal combustion engine. Specifically, for the two different valve lifts shown in the two sets of figures, when they are simultaneously in the open or closed state, the pad 253 is driven by the gear 251 to move, thereby adjusting the distance between the first end 231 and the fourth end 242. This achieves the adjustment of the relative angle between the support rocker arm 230 and the main rocker arm 240 in the initial state. As a result, when the cam 311 rotates and pushes the first end 231 with its protrusion, the timing of the third end 241 contacting and starting to push the valve 120 changes, that is, the valve lift is adjusted.

[0045] like Figures 1 to 4 As shown, in one embodiment of the present invention, the pad 253 can be wedge-shaped or trapezoidal, and the two sides of the pad 253 in the first direction X respectively mate with the two opposing sides of the first end 231 and the fourth end 242. Through the above design, the present invention enables better assembly of the pad 253 with the first end 231 and the fourth end 242, reduces the resistance during the movement of the pad 253, alleviates wear between components, and extends service life. In some embodiments, the pad 253 can also be circular, elliptical, or rectangular, etc., and is not limited to this embodiment.

[0046] like Figures 1 to 4As shown, in one embodiment of the present invention, the pad 253 may have a first through hole 2531 extending along a third direction Z, which is perpendicular to the first direction X and the second direction Y. Based on this, the toothed rod 252 may extend along the third direction Z, with one end of the toothed rod 252 passing through the first through hole 2531. A fixing member 2532 is provided in the first through hole 2531, and the fixing member 2532 fixes the toothed rod 252 and the pad 253. Through the above design, the present invention can facilitate the assembly and connection of the toothed rod 252 and the pad 253. In some embodiments, the toothed rod 252 and the pad 253 may also be connected in other ways, such as welding, or the toothed rod 252 and the pad 253 may also be an integral structure, and are not limited to this embodiment.

[0047] like Figures 1 to 4 As shown, based on the design of the pad 253 having a first through hole 2531 and one end of the rack 252 passing through the first through hole 2531, in one embodiment of the present invention, the inner diameter of the first through hole 2531 can be greater than the height of the rack 252 in the first direction X. Furthermore, the fixing member 2532 can be a pin, which passes through one end of the rack 252, and both ends of the pin are respectively fixedly connected to the pad 253. Accordingly, one end of the rack 252 can slide along the pin and generate relative displacement with the pad 253 in the first direction X. Through the above design, the present invention can achieve relative displacement between the rack 252 and the pad 253 in the first direction X, while ensuring that the rack 252 and the pad 253 are relatively fixed in the third direction Z. Accordingly, when the rack 252 drives the pad 253 to move along the third direction Z, the relative angle between the first end 231 and the fourth end 242 changes, causing the pad 253 to be displaced relative to the rotating shaft 220 in the first direction X. At this time, by utilizing the sliding fit design between the rack 252 and the pin, it is possible to further ensure that the rack 252 always maintains its arrangement along the third direction Z, and avoid the rack 252 tilting and affecting its meshing with the gear 251.

[0048] like Figures 1 to 5As shown, in one embodiment of the present invention, the adjustment drive mechanism may include a drive sleeve 254 and a drive motor 255. Specifically, the drive sleeve 254 is sleeved on the rotating shaft 220, that is, the drive sleeve 254 can rotate around the rotating shaft 220, and the gear 251 is disposed on the drive sleeve 254, that is, the gear 251 can rotate with the drive sleeve 254 around the rotating shaft 220. The drive motor 255 is used to drive the drive sleeve 254 to rotate around the rotating shaft 220, so as to drive the gear 251 to rotate. Through the above design, by using the drive motor 255, the present invention can realize a flexible adjustment principle. For example, by controlling the drive motor 255 to rotate forward or backward by an angle, the position of the pad 253 is changed, so that the included angle of the combined rocker arm mechanism 200 composed of the rocker arm 230 and the main rocker arm 240 changes, so that the height of one end (i.e., the third end 241) of the drive valve 120 is changed, and finally the maximum lift of the valve 120 is increased or decreased. When the engine is running, the angle of forward or reverse movement of the drive motor 255 can be controlled according to the actual working conditions of the engine, thereby controlling the increase or decrease of the valve lift 120, further improving accuracy and response speed.

[0049] like Figures 1 to 4 As shown, in one embodiment of the present invention, the rocker arm 230 may have a second through hole 233 extending in a third direction Z, and the rack 252 may pass through the second through hole 233, with one end of the rack 252 extending out of the second through hole 233 and connected to the pad block 253. Furthermore, the second through hole 233 may be provided in the portion of the rocker arm 230 located between the rotating shaft 220 and the main rocker arm 240, and the second end 232 of the rocker arm 230 may have a shaft cavity 234 accommodating the gear 251 and the rotating shaft 220. The second through hole 233 has an opening and communicates with the shaft cavity 234 through the opening, with a portion of the rack 252 exposed through the opening and meshing with the gear 251. Through the above design, the present invention can utilize the second through hole 233 to arrange the rack 252, thereby providing guidance and support for the rack 252. At the same time, the present invention arranges the rack 252 inside the rocker arm 230, which ensures that the rack 252 meshes with the gear 251, and facilitates the arrangement of the middle part of the main rocker arm 240 on the outer periphery of the first end 231, which helps to reduce the structural complexity.

[0050] In one embodiment of the present invention, the first reset elastic element 243 may be a coil spring. One end of the coil spring is connected to the bearing seat 210, and the other end is connected to the main rocker arm 240.

[0051] like Figures 1 to 4 As shown, in one embodiment of the present invention, the bearing seat 210 can be fixed to the cylinder head 110.

[0052] like Figures 1 to 4As shown, in one embodiment of the present invention, a second reset elastic member 121 can be connected between the end of the valve 120 extending out of the cylinder head 110 and the cylinder head 110. With the above design, when the cam 311 rotates to abut the first end 231 of the rocker arm 230 with its protrusion, the third end 241 of the main rocker arm 240 presses against the valve 120, overcoming the preload force of the second reset elastic member 121, thus opening the valve 120. When the cam 311 rotates to a position where its base circle contacts the first end 231, the third end 241 moves away from the valve 120, and the second reset elastic member 121 releases its preload force, causing the valve 120 to automatically return to the closed state.

[0053] Based on the detailed description of several exemplary embodiments of the cylinder device proposed in this invention above, the following is combined with... Figures 1 to 4 The working status and adjustment actions of the cylinder assembly under different valve 120 lift conditions are explained.

[0054] like Figure 1 As shown, the drive motor 255 drives the drive sleeve 254 to rotate, and the gear 251 drives the rack 252 to move linearly. The rack 252 causes the pad 253 to move to the right through a pin. When it is in the rightmost position, the angle between the combined rocker arm mechanism 200, which consists of the support rocker arm 230 and the main rocker arm 240, is at its maximum. While moving to the right, the pad 253 also moves upward along the rack 252 within the first through hole 2531. When the pad 253 is in the rightmost position, the rack 252 is at its lowest point within the first through hole 2531 of the elongated pad 253.

[0055] like Figure 1 As shown, cam 311 is in the base circle position, and the first reset elastic member 243 causes the rocker arm 230 to fit against the base circle of cam 311, minimizing the clearance between the main rocker arm 240 and valve 120. Valve 120 is in the closed state under the action of the second reset elastic member 121.

[0056] like Figure 2 As shown, when the cam 311 rotates and is in the lift position, it pushes the rocker arm 230. The rocker arm 230 drives the pad 253, which in turn pushes the main rocker arm 240. The main rocker arm 240 acts on the valve 120, opening the valve 120. Because the combined rocker arm mechanism 200 formed by the rocker arm 230 and the main rocker arm 240 has the largest included angle, the main rocker arm 240 overcomes the preload force of the second reset elastic element 121, thus pushing the valve 120 to open with the highest lift.

[0057] like Figure 3As shown, when the drive motor 255 drives the drive sleeve 254 to rotate in the opposite direction, the gear 251 drives the rack 252 to move linearly. The rack 252 causes the pad 253 to move to the left through the pin. When it is in the leftmost position, the angle between the combined rocker arm mechanism 200 composed of the support rocker arm 230 and the main rocker arm 240 is the smallest. The rack 252 is at the uppermost end in the first through hole 2531 of the elongated pad 253 on the pad 253.

[0058] like Figure 3 As shown, cam 311 is in the base circle position, and the first reset elastic member 243 causes the rocker arm 230 to fit against the base circle of cam 311, with the main rocker arm 240 having the maximum clearance from valve 120. Valve 120 is in the closed state under the action of the second reset elastic member 121.

[0059] like Figure 4 As shown, when the cam 311 rotates and is in the lift position, it pushes the rocker arm 230. The rocker arm 230 drives the pad 253, which in turn pushes the main rocker arm 240. The main rocker arm 240 acts on the valve 120, opening the valve 120. Because the angle between the combined rocker arm mechanism 200 formed by the rocker arm 230 and the main rocker arm 240 is the smallest, the main rocker arm 240 overcomes the preload force of the second reset elastic element 121, resulting in the smallest lift for opening the valve 120.

[0060] By controlling the drive motor 255 to rotate forward or backward, and by changing the position of the pad 253, the angle between the combined rocker arm mechanism 200 composed of the rocker arm 230 and the main rocker arm 240 changes, thereby increasing or decreasing the lift of the valve 120. The magnitude of the increase or decrease in the lift of the valve 120 is controlled by the angle through which the drive motor 255 rotates.

[0061] It should be noted that the cylinder devices shown in the accompanying drawings and described in this specification are merely a few examples among many cylinder devices capable of employing the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any detail or component of the cylinder devices shown in the accompanying drawings or described in this specification.

[0062] In summary, the cylinder device proposed in this invention includes a cylinder, a valve 120, and a combined rocker arm mechanism 200. The combined rocker arm mechanism 200 includes a bearing seat 210, a rotating shaft 220, a support rocker arm 230, a main rocker arm 240, and an adjustment mechanism. The rotating shaft 220 is rotatably mounted on the bearing seat 210. The support rocker arm 230 has a first end 231 and a second end 232. The first end 231 cooperates with a cam 311, and the second end 232 is fixedly connected to the rotating shaft 220. The main rocker arm 240 has a third end 241 and a fourth end 242. The third end 241 is used to press against the other end of the valve 120 extending out of the cylinder head 110, and the fourth end... The rocker arm 240 is located at intervals on the side of the first end 231 facing away from the valve 120. The main rocker arm 240 is rotatably connected to the rotating shaft 220 at its center. The adjustment mechanism includes a gear 251, a rack 252, and a pad 253. The gear 251 is rotatably sleeved on the rotating shaft 220 and driven by the adjustment drive mechanism. One end of the rack 252 meshes with the gear 251, and the other end extends and connects to the pad 253 placed between the first end 231 and the fourth end 242. The adjustment mechanism drives the gear 251 to move the rack 252 and the pad 253, adjusting the distance between the first end 231 and the fourth end 242, thereby adjusting the lift of the valve 120. Through the above design, by utilizing the action-coupling relationship of the gear 251 driving the rack 252 to move and causing the pad 253 to move, the present invention can adjust the position of the pad 253 placed between the rocker arm 230 and the main rocker arm 240, thereby adjusting the relative position angle between the rocker arm 230 and the main rocker arm 240. This causes the combined rocker arm mechanism 200 composed of the rocker arm 230 and the main rocker arm 240 to change its shape when it is not pushed by the protrusion of the cam 311, that is, the distance between the third end 241 of the main rocker arm 240 and the valve 120 changes. This achieves the adjustment of the initial relative position between the combined rocker arm mechanism 200 and the valve 120, thus realizing the function of variable valve lift. Compared with the existing solution of hydraulic lift adjustment, the present invention uses the above-mentioned mechanical adjustment scheme, which reduces the design requirements of the hydraulic drive part and can improve the control stability and accuracy of the valve lift adjustment function.

[0063] Furthermore, based on the above design of the present invention, the present invention also has at least the following advantages:

[0064] This invention addresses the need for real-time variable control of valve lift during internal combustion engine operation.

[0065] This invention only requires a redesign of the combined rocker arm mechanism, without modifying the cylinder block, cylinder head, and valves, thus avoiding the increased costs and impact on structural strength caused by the aforementioned modifications.

[0066] This invention reduces the driving force requirements of the drive system.

[0067] This invention has a wide range of applications and is suitable for internal combustion engines using various fuels such as gasoline, diesel, natural gas, and liquefied petroleum gas.

[0068] Based on the detailed description of several exemplary embodiments of the cylinder device proposed in this invention above, an exemplary embodiment of the reciprocating piston internal combustion engine proposed in this invention will be described below.

[0069] In one embodiment of the present invention, the reciprocating piston internal combustion engine proposed in the present invention includes the cylinder assembly proposed in the present invention and described in detail in the above embodiments. The reciprocating piston internal combustion engine may, for example, be a four-stroke reciprocating piston internal combustion engine.

[0070] It should be noted that the reciprocating piston internal combustion engines shown in the accompanying drawings and described in this specification are merely a few examples among many reciprocating piston internal combustion engines from which the principles of the present invention can be employed. It should be clearly understood that the principles of the present invention are by no means limited to any detail or component of the reciprocating piston internal combustion engines shown in the accompanying drawings or described in this specification.

[0071] In summary, the reciprocating piston internal combustion engine proposed in this invention, by employing the cylinder device proposed in this invention, can achieve the function of variable valve lift and improve the control stability and accuracy of the valve lift adjustment function.

[0072] The foregoing has described and / or illustrated exemplary embodiments of the cylinder assembly and reciprocating piston internal combustion engine proposed in this invention. However, the embodiments of this invention are not limited to the specific embodiments described herein; rather, components and / or steps of each embodiment may be used independently and separately from other components and / or steps described herein. Each component and / or step of one embodiment may also be used in combination with other components and / or steps of other embodiments. In describing the elements / components / etc. described and / or illustrated herein, the terms “a,” “an,” and “the above” are used to indicate the presence of one or more elements / components / etc. The terms “comprising,” “including,” and “having” are used to indicate an open-ended inclusion and mean that additional elements / components / etc. may exist in addition to those listed. Furthermore, the terms “first” and “second” in the claims and specification are used only as illustrative marks and are not intended to limit the numerical scope of the subject matter.

[0073] Although the cylinder assembly and reciprocating piston internal combustion engine proposed in this invention have been described according to different specific embodiments, those skilled in the art will recognize that modifications can be made to the implementation of this invention within the spirit and scope of the claims.

Claims

1. A cylinder device characterized by comprising: A cylinder device for a reciprocating piston internal combustion engine, the cylinder device comprising: a cylinder and a valve extending in a first direction and penetrating a cylinder head of the cylinder, one end of the valve being located in the cylinder head and being configured to close or open a port of the cylinder head, the other end of the valve extending out of the cylinder head; and a combined rocker arm mechanism comprising: a shaft seat, a rotating shaft, a branch rocker arm and a main rocker arm, the rotating shaft extending in a second direction and being rotatably arranged in the shaft seat, the second direction being perpendicular to the first direction, the branch rocker arm having a first end portion configured to cooperate with a cam and a second end portion fixedly connected to the rotating shaft, the main rocker arm having a third end portion configured to press against the other end of the valve extending out of the cylinder head and a fourth end portion located on a side of the first end portion opposite to the valve in the first direction, the main rocker arm being rotatably connected to the rotating shaft at a middle portion, and a first reset elastic member being arranged between the main rocker arm and the shaft seat; and an adjusting mechanism comprising a gear, a toothed rod and a spacer, the gear being rotatably sleeved on the rotating shaft and being driven by an adjusting driving mechanism, one end of the toothed rod being engaged with the gear and the other end extending between the first end portion and the fourth end portion, the spacer being fixed to the other end of the toothed rod and being arranged between the first end portion and the fourth end portion, the adjusting mechanism being configured to adjust the distance between the first end portion and the fourth end portion by driving the gear to rotate, thereby adjusting the lift of the valve.

2. The cylinder device according to claim 1, characterized in that The spacer is wedge-shaped, and two side faces of the spacer in the first direction are respectively matched with two side faces of the first end portion and the fourth end portion facing each other.

3. The cylinder device according to claim 1, characterized in that The spacer is provided with a first through hole penetrating in a third direction, the third direction being perpendicular to the first direction and perpendicular to the second direction, the toothed rod extending in the third direction, one end of the toothed rod penetrating the first through hole, and a fixing member being arranged in the first through hole and fixedly connecting the toothed rod and the spacer.

4. The cylinder device according to claim 3, characterized in that An inner diameter of the first through hole is greater than a height of the toothed rod in the first direction, and the fixing member is a pin penetrating one end of the toothed rod and fixedly connected to the spacer at both ends.

5. The cylinder device according to claim 1, characterized in that The adjusting driving mechanism comprises a driving sleeve and a driving motor, the driving sleeve being sleeved on the rotating shaft, the gear being arranged in the driving sleeve, and the driving motor being configured to drive the driving sleeve to rotate around the rotating shaft, thereby driving the gear to rotate.

6. The cylinder device according to claim 1, characterized in that The support rocker arm is provided with a second through hole penetrating in a third direction, the third direction being perpendicular to the first direction and perpendicular to the second direction, the tooth bar extending in the third direction, the tooth bar being arranged in the second through hole, and one end of the tooth bar being connected with the pad by extending out of the second through hole; wherein the second through hole is arranged at a portion of the support rocker arm between the rotating shaft and the main rocker arm, the second end portion is provided with a shaft cavity accommodating the gear and the rotating shaft, the second through hole is provided with an opening and is communicated with the shaft cavity through the opening, and the tooth bar portion is exposed from the opening and engaged with the gear.

7. The cylinder device according to claim 1, characterized in that The first reset elastic member is a coil spring.

8. The cylinder device according to claim 1, characterized in that The shaft seat is fixed on the cylinder head.

9. The cylinder device according to claim 1, characterized in that A second reset elastic member is arranged between the end of the valve extending out of the cylinder head and the cylinder head.

10. A reciprocating piston internal combustion engine characterised in that, The cylinder device comprises the cylinder device according to any one of claims 1-9.

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