A rocker arm mechanism and an engine valve gear

Abstract

This utility model discloses a rocker arm mechanism and an engine valve train, relating to the field of engine technology. The rocker arm mechanism includes a connecting shaft, an exhaust rocker arm assembly, and a braking rocker arm assembly. A first seal is disposed in a first cavity, one end of which is connected to a first elastic element, and the other end is connected to a first limiting unit. A first piston is slidably disposed in a second cavity. The braking rocker arm is arranged side-by-side with the exhaust rocker arm and sleeved outside the connecting shaft. A second seal is disposed in a third cavity, one end of which is connected to a second elastic element, and the other end is connected to a second limiting unit. A second piston is slidably disposed in a fourth cavity. The rocker arm mechanism provided by this utility model can quickly switch between HLA rocker arm function and braking rocker arm function, automatically eliminating valve clearance on the one hand and automatically adjusting clearance increased due to wear on the other, offering diverse functions to meet user needs.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and more specifically, to a rocker arm mechanism and an engine valve train. Background Technology

[0002] Currently, with the continuous advancement of science and technology, users have increasingly higher demands for automobile engines. They not only expect high fuel economy under various operating conditions but also require the engine to provide significant braking power during braking. This poses a considerable challenge to current engine valve train systems. The HLA (hydraulic clearance adjustment) rocker arm in the engine valve train can automatically eliminate valve clearance, while the brake rocker arm can automatically and promptly adjust clearances increased due to wear, ensuring that the braking clearance remains within the design range. However, current engine valve train systems can only use either the HLA rocker arm or the brake rocker arm individually, resulting in limited functionality and an inability to simultaneously leverage the advantages of both.

[0003] In view of this, it is particularly important to design and manufacture a rocker arm mechanism and engine valve train that are versatile and easy to switch between, especially in engine production. Utility Model Content

[0004] The purpose of this utility model is to provide a rocker arm mechanism that can quickly switch between HLA rocker arm function and braking rocker arm function. On the one hand, it automatically eliminates valve clearance, and on the other hand, it automatically adjusts the clearance that has increased due to wear. It has multiple functions to meet user needs.

[0005] Another objective of this invention is to provide an engine valve train that enables rapid switching between HLA rocker arm function and brake rocker arm function. On the one hand, it automatically eliminates valve clearance, and on the other hand, it automatically adjusts clearances increased due to wear. It offers multiple functions to meet user needs.

[0006] This utility model is achieved by the following technical solution.

[0007] A rocker arm mechanism includes a connecting shaft, an exhaust rocker arm assembly, and a braking rocker arm assembly. The connecting shaft has a first main flow channel. The exhaust rocker arm assembly includes an exhaust rocker arm, a first elastic element, a first seal, a first limiting unit, and a first piston. The exhaust rocker arm is sleeved outside the connecting shaft and has a first cavity and a second cavity that communicate with each other. The first cavity communicates with the first main flow channel through a first oil passage. The first seal is disposed in the first cavity, with one end connected to the first elastic element and the other end connected to the first limiting unit. The first seal is used to separate the first cavity from the first oil passage. The first limiting unit is used to overcome the elastic force of the first elastic element and push the first seal open. The first piston is slidably disposed in the second cavity. The piston is used to connect with the first valve mechanism; the brake rocker arm assembly includes a brake rocker arm, a second elastic element, a second seal, a second limiting unit, and a second piston. The brake rocker arm is arranged side by side with the exhaust rocker arm and is sleeved outside the connecting shaft. The brake rocker arm has a third cavity and a fourth cavity that are interconnected. The third cavity is connected to the first main flow channel through the second oil passage. The second seal is disposed in the third cavity. One end of the second seal is connected to the second elastic element, and the other end is connected to the second limiting unit. The second seal is used to isolate the third cavity and the second oil passage. The second limiting unit is used to lock the second seal in coordination with the elastic force of the second elastic element. The second piston is slidably disposed in the fourth cavity and is used to connect with the first valve mechanism.

[0008] Optionally, the first limiting unit includes a first connecting rod and a third elastic element. The connecting shaft also has a second main channel. The exhaust rocker arm has a fifth cavity. The first connecting rod is slidably mounted in the fifth cavity and extends into the first cavity and is connected to the first seal. The third elastic element is connected to the first connecting rod. The elastic force applied by the third elastic element to the first connecting rod is in the same direction as the elastic force applied by the first elastic element to the first seal, and is opposite to the pressure applied by the oil entering the fifth cavity from the second main channel to the first connecting rod.

[0009] Optionally, a limiting platform is provided at the end of the first connecting rod away from the first seal, and a limiting groove is provided in the fifth cavity. The limiting platform and the limiting groove are slidably engaged. The first elastic element is sleeved outside the first connecting rod and is provided on one side of the limiting platform. The inlet of the fifth cavity is provided on the other side of the limiting platform.

[0010] Optionally, the first piston is provided with a limiting shoulder, the second cavity is provided with a stepped end face, and the exhaust rocker arm assembly also includes a fourth elastic element. The fourth elastic element is disposed in the second cavity and connected to the first piston. The fourth elastic element is used to apply elastic force to the first piston so that the limiting shoulder abuts against the stepped end face.

[0011] Optionally, the second limiting unit includes a second connecting rod and a fifth elastic element. The connecting shaft also has a second main channel. The brake rocker arm has a sixth cavity. The second connecting rod is slidably mounted in the sixth cavity and extends into the third cavity and is connected to the second seal. The fifth elastic element is connected to the second connecting rod. The elastic force applied by the fifth elastic element to the second connecting rod is opposite in direction to the elastic force applied by the second elastic element to the second seal, and is also opposite in direction to the pressure applied by the oil entering the sixth cavity from the second main channel to the second connecting rod.

[0012] Optionally, a limiting sleeve is provided at the end of the second connecting rod away from the first seal. The limiting sleeve slides with the inner wall of the sixth cavity. A limiting flange is provided inside the sixth cavity. The fifth elastic element is sleeved outside the limiting flange and is located on one side of the limiting sleeve. The inlet of the sixth cavity is located on the other side of the limiting sleeve.

[0013] Optionally, the brake rocker arm assembly further includes a fixed post and a sixth elastic element. The fixed post is installed on the brake rocker arm and extends into the fourth cavity. The second piston is sleeved outside the fixed post. A limit ring is provided at the opening of the second piston. The limit ring slides with the fixed post. A retaining ring is provided at the free end of the fixed post. The sixth elastic element is sleeved outside the fixed post. One end of the sixth elastic element abuts against the retaining ring, and the other end abuts against the limit ring.

[0014] Optionally, the rocker arm mechanism further includes an intake rocker arm assembly, which includes an intake rocker arm, a seventh elastic element, a third seal, and a third piston. The intake rocker arm is located on the side of the exhaust rocker arm away from the brake rocker arm and is sleeved outside the connecting shaft. The connecting shaft also has a second main flow channel. The intake rocker arm has a seventh cavity and an eighth cavity that are interconnected. The seventh cavity is connected to the second main flow channel through a third oil passage. The third seal is located in the seventh cavity and is connected to the seventh elastic element. The third seal is used to isolate the seventh cavity from the third oil passage. The third piston is slidably located in the eighth cavity and is used to connect with the second valve mechanism.

[0015] Optionally, the third piston is provided with a limiting protrusion, and a stop end face is provided in the eighth cavity. The intake rocker arm assembly also includes an eighth elastic element, which is disposed in the eighth cavity and connected to the third piston. The eighth elastic element is used to apply elastic force to the third piston so that the limiting protrusion abuts against the stop end face.

[0016] An engine valve train includes the aforementioned rocker arm mechanism. The rocker arm mechanism includes a connecting shaft, an exhaust rocker arm assembly, and a brake rocker arm assembly. The connecting shaft has a first main flow channel. The exhaust rocker arm assembly includes an exhaust rocker arm, a first elastic element, a first seal, a first limiting unit, and a first piston. The exhaust rocker arm is sleeved outside the connecting shaft and has a first cavity and a second cavity that communicate with each other. The first cavity communicates with the first main flow channel via a first oil passage. The first seal is disposed within the first cavity, with one end connected to the first elastic element and the other end connected to the first limiting unit. The first seal isolates the first cavity from the first oil passage. The first limiting unit overcomes the elastic force of the first elastic element to push the first seal open. The first piston is slidably disposed. Within the second cavity, the first piston is used to connect with the first valve mechanism; the brake rocker arm assembly includes a brake rocker arm, a second elastic element, a second seal, a second limiting unit, and a second piston. The brake rocker arm is arranged side by side with the exhaust rocker arm and is sleeved outside the connecting shaft. The brake rocker arm has a third cavity and a fourth cavity that are interconnected. The third cavity is connected to the first main flow channel through the second oil passage. The second seal is disposed within the third cavity. One end of the second seal is connected to the second elastic element, and the other end is connected to the second limiting unit. The second seal is used to isolate the third cavity and the second oil passage. The second limiting unit is used to lock the second seal in conjunction with the elastic force of the second elastic element. The second piston is slidably disposed within the fourth cavity and is used to connect with the first valve mechanism.

[0017] The rocker arm mechanism and engine valve train provided by this utility model have the following beneficial effects:

[0018] The rocker arm mechanism provided by this utility model has a first main channel on the connecting shaft; the exhaust rocker arm assembly includes an exhaust rocker arm, a first elastic element, a first sealing element, a first limiting unit, and a first piston. The exhaust rocker arm is sleeved outside the connecting shaft and has a first cavity and a second cavity that are interconnected. The first cavity is connected to the first main channel through a first oil passage. The first sealing element is disposed in the first cavity, with one end connected to the first elastic element and the other end connected to the first limiting unit. The first sealing element is used to separate the first cavity from the first oil passage. The first limiting unit is used to overcome the elastic force of the first elastic element and push the first sealing element open. The first piston is slidably disposed in the second cavity and is used to interact with the first... The valve mechanism is connected; the brake rocker arm assembly includes a brake rocker arm, a second elastic element, a second seal, a second limiting unit, and a second piston. The brake rocker arm and exhaust rocker arm are arranged side by side and sleeved outside the connecting shaft. The brake rocker arm has a third cavity and a fourth cavity that are interconnected. The third cavity is connected to the first main flow channel through a second oil passage. The second seal is disposed in the third cavity. One end of the second seal is connected to the second elastic element, and the other end is connected to the second limiting unit. The second seal is used to isolate the third cavity and the second oil passage. The second limiting unit is used to lock the second seal in conjunction with the elastic force of the second elastic element. The second piston is slidably disposed in the fourth cavity and is used to connect with the first valve mechanism. Compared with the prior art, the rocker arm mechanism provided by this utility model, due to the use of a brake rocker arm and an exhaust rocker arm arranged side by side, and a first cavity and a third cavity both connected to the first main flow channel, can realize rapid switching between HLA rocker arm function and brake rocker arm function. On the one hand, it automatically eliminates valve clearance, and on the other hand, it automatically adjusts the clearance increased due to wear. It has multiple functions to meet user needs.

[0019] The engine valve train provided by this utility model includes a rocker arm mechanism, which can quickly switch between HLA rocker arm function and braking rocker arm function. On the one hand, it automatically eliminates valve clearance, and on the other hand, it automatically adjusts the clearance that has increased due to wear. It has multiple functions to meet user needs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A structural schematic diagram of the engine valve train provided in an embodiment of this utility model;

[0022] Figure 2A structural schematic diagram of the engine valve train provided in an embodiment of this utility model from another perspective;

[0023] Figure 3 This is a schematic diagram of the rocker arm mechanism provided in an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the exhaust rocker arm assembly in the rocker arm mechanism provided in the embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the braking rocker arm assembly in the rocker arm mechanism provided in an embodiment of the present utility model;

[0026] Figure 6 A schematic diagram of the air intake rocker arm assembly in the rocker arm mechanism provided in this embodiment of the utility model.

[0027] Icons: 10-Engine valve train; 100-Rock arm mechanism; 110-Connecting shaft; 111-First main flow channel; 112-Second main flow channel; 120-Exhaust rocker arm assembly; 121-Exhaust rocker arm; 1211-First cavity; 1212-Second cavity; 1213-First oil passage; 1214-First roller; 1215-Fifth cavity; 1216-Limiting groove; 122-First elastic element; 123-... 1. Sealing element; 124-First limiting unit; 1241-First connecting rod; 1242-Third elastic element; 1243-Limiting platform; 125-First piston; 126-Fourth elastic element; 130-Brake rocker arm assembly; 131-Brake rocker arm; 1311-Third cavity; 1312-Fourth cavity; 1313-Second oil passage; 1314-Second roller; 1315-Sixth cavity; 1316-Limiting flange; 132-Second elastic element; 133-Second seal; 134-Second limiting unit; 1341-Second connecting rod; 1342-Fifth elastic element; 1343-Limiting sleeve; 135-Second piston; 136-Fixing post; 137-Sixth elastic element; 140-Intake rocker arm assembly; 141-Intake rocker arm; 1411-Seventh cavity; 1412-Eighth cavity; 1413-Third oil passage; 1414-Third Roller; 142-Seventh elastic element; 143-Third seal; 144-Third piston; 145-Eighth elastic element; 200-Camshaft mechanism; 210-Main shaft; 220-Intake cam; 230-Exhaust cam; 240-Brake cam; 300-First valve mechanism; 310-First valve bridge; 320-First valve; 400-Second valve mechanism; 410-Second valve bridge; 420-Second valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that the terms "inner," "outer," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0034] Please refer to the reference. Figures 1 to 6This utility model embodiment provides an engine valve train 10 for realizing the intake and exhaust of cylinders. It can quickly switch between HLA rocker arm function and braking rocker arm function, automatically eliminating valve clearance on the one hand and automatically adjusting clearance increased due to wear on the other hand, providing multiple functions to meet user needs.

[0035] The engine valve train 10 includes a rocker arm mechanism 100, a camshaft mechanism 200, a first valve mechanism 300, and a second valve mechanism 400. The camshaft mechanism 200 cooperates with the rocker arm mechanism 100, and the first valve mechanism 300 and the second valve mechanism 400 are arranged side-by-side. The rocker arm mechanism 100 is connected to both the first valve mechanism 300 and the second valve mechanism 400. The camshaft mechanism 200 can drive the first valve mechanism 300 and the second valve mechanism 400 to move via the rocker arm mechanism 100, thereby closing or opening the ventilation passages to achieve cylinder intake and exhaust. Specifically, the camshaft mechanism 200 includes a main shaft 210 and an intake cam 220, an exhaust cam 230, and a brake cam 240 mounted on the main shaft 210. The intake cam 220, exhaust cam 230, and brake cam 240 all cooperate with the rocker arm mechanism 100. The first valve mechanism 300 includes a first valve bridge 310 and a first valve 320, the second valve mechanism 400 includes a second valve bridge 410 and a second valve 420, and the rocker arm mechanism 100 is connected to the first valve 320 and the second valve 420 through the first valve bridge 310 and the second valve bridge 410.

[0036] The rocker arm mechanism 100 includes a connecting shaft 110, an exhaust rocker arm assembly 120, a braking rocker arm assembly 130, and an intake rocker arm assembly 140. The exhaust rocker arm assembly 120, the braking rocker arm assembly 130, and the intake rocker arm assembly 140 are all rotatably mounted on the connecting shaft 110. The connecting shaft 110 has a first main flow channel 111 and a second main flow channel 112. The first main flow channel 111 and the second main flow channel 112 are used to selectively connect with the exhaust rocker arm assembly 120, the braking rocker arm assembly 130, and the intake rocker arm assembly 140 under the control of a solenoid valve to achieve an oil inlet function.

[0037] The exhaust rocker arm assembly 120 includes an exhaust rocker arm 121, a first elastic element 122, a first sealing element 123, a first limiting unit 124, and a first piston 125. The exhaust rocker arm 121 is sleeved outside the connecting shaft 110 and can rotate relative to the connecting shaft 110. The exhaust rocker arm 121 has a first cavity 1211 and a second cavity 1212 that are interconnected. The first cavity 1211 is connected to the first main channel 111 through a first oil passage 1213. A first seal 123 is disposed within the first cavity 1211. One end of the first seal 123 is connected to the first elastic member 122, and the other end is connected to the first limiting unit 124. The first seal 123 is used to separate the first cavity 1211 and the first oil passage 1213 under the elastic force of the first elastic member 122. The first limiting unit 124 is used to overcome the elastic force of the first elastic member 122 and push the first seal 123 open, so that oil can enter the first cavity 1211 and the second cavity 1212 through the first oil passage 1213. A first piston 125 is slidably disposed within the second cavity 1212. The first piston 125 is used to connect to the middle part of the first valve bridge 310 of the first valve mechanism 300. A first roller 1214 is provided at the end of the exhaust rocker arm 121 away from the first valve mechanism 300. The first roller 1214 cooperates with the exhaust cam 230. The first roller 1214 can drive the exhaust rocker arm 121 to rotate relative to the connecting shaft 110 under the action of the exhaust cam 230, thereby driving the first valve 320 to move through the first valve bridge 310.

[0038] The brake rocker arm assembly 130 includes a brake rocker arm 131, a second elastic element 132, a second seal 133, a second limiting unit 134, and a second piston 135. The brake rocker arm 131 is arranged side by side with the exhaust rocker arm 121 and is sleeved outside the connecting shaft 110. The brake rocker arm 131 can rotate relative to the connecting shaft 110. The brake rocker arm 131 has a third cavity 1311 and a fourth cavity 1312 that are interconnected. The third cavity 1311 is connected to the first main channel 111 through the second oil passage 1313. The second seal 133 is disposed in the third cavity 1311. One end of the second seal 133 is connected to the second elastic member 132, and the other end is connected to the second limiting unit 134. The second seal 133 is used to isolate the third cavity 1311 and the second oil passage 1313 under the elastic force of the first elastic member 122. The second limiting unit 134 is used to lock the second seal 133 in conjunction with the elastic force of the second elastic member 132 to prevent oil from entering the third cavity 1311 through the second oil passage 1313. The second piston 135 is slidably disposed in the fourth cavity 1312. The second piston 135 is used to connect to the end of the first valve bridge 310 of the first valve mechanism 300. A second roller 1314 is provided at the end of the brake rocker arm 131 away from the first valve mechanism 300. The second roller 1314 cooperates with the brake cam 240. Under the action of the brake cam 240, the second roller 1314 can drive the brake rocker arm 131 to rotate relative to the connecting shaft 110, thereby driving the first valve 320 to move through the first valve bridge 310.

[0039] In this way, since the exhaust rocker arm 121 and the brake rocker arm 131 are arranged side by side and both are sleeved on the connecting shaft 110, one end of the exhaust rocker arm 121 is engaged with the exhaust cam 230 and the other end is connected to the first valve mechanism 300. One end of the brake rocker arm 131 is engaged with the brake cam 240 and the other end is also connected to the first valve mechanism 300. Since the first main flow channel 111 is connected to both the first cavity 1211 and the third cavity 1311, the first main flow channel 111 can supply oil to the first cavity 1211 and the third cavity 1311. Therefore, the HLA rocker arm function and the brake rocker arm function can be quickly switched. On the one hand, the valve clearance is automatically eliminated, and on the other hand, the clearance increased due to wear is automatically adjusted. The functions are diverse and meet the needs of users.

[0040] The first limiting unit 124 includes a first connecting rod 1241 and a third elastic element 1242. The exhaust rocker arm 121 has a fifth cavity 1215. The first connecting rod 1241 is slidably mounted in the fifth cavity 1215 and extends into the first cavity 1211, and is connected to the first seal 123. The third elastic member 1242 is connected to the first connecting rod 1241. The elastic force applied by the third elastic member 1242 to the first connecting rod 1241 is in the same direction as the elastic force applied by the first elastic member 122 to the first seal 123, and is opposite to the pressure applied by the oil entering the fifth cavity 1215 from the second main channel 112 to the first connecting rod 1241. The oil pressure entering the fifth cavity 1215 from the second main channel 112 can overcome the elastic forces of the first elastic member 122 and the third elastic member 1242 to lift the first seal 123, thereby keeping the first cavity 1211 and the first oil passage 1213 in communication, and allowing the oil in the first cavity 1211 and the second cavity 1212 to freely enter and exit.

[0041] Specifically, a limiting platform 1243 is provided at the end of the first connecting rod 1241 away from the first seal 123, and a limiting groove 1216 is provided in the fifth cavity 1215. The limiting platform 1243 and the limiting groove 1216 are slidably engaged. The first elastic member 122 is sleeved on the outside of the first connecting rod 1241 and is located on one side of the limiting platform 1243. The inlet of the fifth cavity 1215 is located on the other side of the limiting platform 1243.

[0042] Furthermore, the first piston 125 is provided with a limiting shoulder (not shown in the figure), and the second cavity 1212 is provided with a stepped end face (not shown in the figure). The exhaust rocker arm assembly 120 also includes a fourth elastic element 126, which is disposed in the second cavity 1212 and connected to the first piston 125. The fourth elastic element 126 is used to apply elastic force to the first piston 125 so that the limiting shoulder abuts against the stepped end face, thereby realizing the reset function of the first piston 125.

[0043] The second limiting unit 134 includes a second connecting rod 1341 and a fifth elastic element 1342. The brake rocker arm 131 has a sixth cavity 1315. The second connecting rod 1341 is slidably mounted in the sixth cavity 1315 and extends into the third cavity 1311, and is connected to the second seal 133. The fifth elastic member 1342 is connected to the second connecting rod 1341. The elastic force applied by the fifth elastic member 1342 to the second connecting rod 1341 is opposite in direction to the elastic force applied by the second elastic member 132 to the second seal 133, and is also opposite in direction to the pressure applied by the oil entering the sixth cavity 1315 from the second main channel 112 to the second connecting rod 1341. The oil pressure entering the sixth cavity 1315 from the second main channel 112 can overcome the elastic force of the fifth elastic member 1342 to lock the second seal 133, thereby keeping the third cavity 1311 isolated from the second oil passage 1313, and thus preventing the oil in the third cavity 1311 and the fourth cavity 1312 from freely entering and exiting.

[0044] Specifically, a limiting sleeve 1343 is provided at the end of the second connecting rod 1341 away from the first seal 123. The limiting sleeve 1343 slides with the inner wall of the sixth cavity 1315. A limiting flange 1316 is provided inside the sixth cavity 1315. The fifth elastic element 1342 is sleeved outside the limiting flange 1316 and is located on one side of the limiting sleeve 1343. The inlet of the sixth cavity 1315 is located on the other side of the limiting sleeve 1343.

[0045] Furthermore, the brake rocker arm assembly 130 also includes a fixed post 136 and a sixth elastic element 137. The fixed post 136 is installed on the brake rocker arm 131 and extends into the fourth cavity 1312. The second piston 135 is sleeved on the fixed post 136. A limit ring (not shown in the figure) is provided at the opening of the second piston 135. The limit ring slides with the fixed post 136. A retaining ring (not shown in the figure) is provided at the free end of the fixed post 136. The sixth elastic element 137 is sleeved on the fixed post 136. One end of the sixth elastic element 137 abuts against the retaining ring, and the other end abuts against the limit ring, thereby realizing the reset function of the second piston 135.

[0046] The intake rocker arm assembly 140 includes an intake rocker arm 141, a seventh elastic element 142, a third seal 143, and a third piston 144. The intake rocker arm 141 is located on the side of the exhaust rocker arm 121 away from the brake rocker arm 131, and is sleeved on the connecting shaft 110. The intake rocker arm 141 can rotate relative to the connecting shaft 110. The intake rocker arm 141 has a seventh cavity 1411 and an eighth cavity 1412 that are interconnected. The seventh cavity 1411 is connected to the second main flow channel 112 through the third oil passage 1413. The third seal 143 is disposed in the seventh cavity 1411 and is connected to the seventh elastic member 142. The third seal 143 is used to isolate the seventh cavity 1411 and the third oil passage 1413 under the elastic force of the seventh elastic member 142. The third piston 144 is slidably disposed in the eighth cavity 1412 and is used to connect with the middle part of the second valve bridge 410 of the second valve mechanism 400. A third roller 1414 is provided at the end of the intake rocker arm 141 away from the second valve mechanism 400. The third roller 1414 cooperates with the intake cam 220. The third roller 1414 can drive the intake rocker arm 141 to rotate relative to the connecting shaft 110 under the action of the intake cam 220, thereby driving the second valve 420 to move through the second valve bridge 410.

[0047] Furthermore, the third piston 144 is provided with a limiting protrusion (not shown in the figure), and a stop end face (not shown in the figure) is provided in the eighth cavity 1412. The intake rocker arm assembly 140 also includes an eighth elastic member 145, which is disposed in the eighth cavity 1412 and connected to the third piston 144. The eighth elastic member 145 is used to apply elastic force to the third piston 144 so that the limiting protrusion abuts against the stop end face, thereby realizing the reset function of the third piston 144.

[0048] It is worth noting that the rocker arm mechanism 100 operates in two states: normal operation and braking. In normal operation, the first main flow channel 111 is saturated with oil, while the second main flow channel 112 is disconnected. Within the exhaust rocker arm 121, oil flows from the first main flow channel 111 into the first cavity 1211 via the first oil passage 1213. During this process, the oil pressure overcomes the elastic force of the first elastic element 122 and the third elastic element 1242, opening the first seal 123 and injecting into the first cavity 1211. The oil then enters the second cavity 1212 through the first cavity 1211. When the first cavity 1211 and the second cavity 1212 are filled with oil, the oil pressure inside and outside the first seal 123 is the same. The first seal 123 then... Under the elastic force of the elastic element 122 and the third elastic element 1242, the first cavity 1211 and the first oil passage 1213 are separated. At this time, the first seal 123, the first cavity 1211, the second cavity 1212 and the first piston 125 together form a sealed cavity filled with oil. Since the oil in the sealed cavity cannot be discharged and external oil cannot enter the sealed cavity, the first seal 123, the first cavity 1211, the second cavity 1212 and the first piston 125 constitute a rigid structure. The exhaust cam 230 can drive the exhaust rocker arm 121 relative to the connecting shaft through the first roller 1214. Rotation of valve 110 causes the first valve 320 to move via the first valve bridge 310. Within the brake rocker arm 131, the first main flow channel 111 supplies oil to the third cavity 1311 via the second oil passage 1313. During this process, the oil pressure overcomes the elastic force of the second elastic element 132, opening the second seal 133 and injecting into the third cavity 1311. The oil then enters the fourth cavity 1312 through the third cavity 1311. When the third cavity 1311 and the fourth cavity 1312 are filled with oil, the oil pressure inside and outside the second seal 133 is the same, and the elastic forces of the second elastic element 132 and the fifth elastic element 1342 are equal. The oil in the third cavity 1311 and the fourth cavity 1312 is mutually balanced so that it can freely enter and exit. At this time, the brake cam 240 can drive the brake rocker arm 131 to rotate relative to the connecting shaft 110 through the second roller 1314. However, the second piston 135 can slide in the fourth cavity 1312 with the first valve bridge 310 (and eventually reset under the action of the fourth elastic element 126), and will not exert force on the first valve bridge 310. Therefore, under normal working conditions, the camshaft mechanism 200 drives the first valve mechanism 300 to move through the exhaust rocker arm 121, and the brake rocker arm 131 is ineffective.

[0049] In the braking state, both the first main flow channel 111 and the second main flow channel 112 are filled with oil. Within the exhaust rocker arm 121, the first main flow channel 111 supplies oil to the first cavity 1211 via the first oil passage 1213, and the second main flow channel 112 supplies oil to the fifth cavity 1215. During this process, the oil pressure overcomes the elastic force of the first elastic element 122 and the third elastic element 1242, opening the first seal 123 and injecting into the first cavity 1211. The oil then enters the second cavity 1212 through the first cavity 1211. When the first cavity 1211 and the second cavity 1212 are filled with oil, the oil pressure inside and outside the first seal 123 becomes the same. The oil injected from the second main flow channel 112... The oil pressure is balanced by the sum of the elastic forces of the first elastic element 122 and the third elastic element 1242, allowing the oil in the first cavity 1211 and the second cavity 1212 to move freely in and out. At this time, the exhaust cam 230 can drive the exhaust rocker arm 121 to rotate relative to the connecting shaft 110 via the first roller 1214. However, the first piston 125 can slide in the second cavity 1212 along with the first valve bridge 310 (and eventually reset under the action of the fourth elastic element 126), without exerting a force on the first valve bridge 310. In the brake rocker arm 131, the first main flow channel 111 supplies oil to the third cavity 1311 through the second oil passage 1313. Oil is introduced into the sixth cavity 1315 through channel 112. During this process, the oil pressure overcomes the elastic force of the second elastic element 132, pushes open the second seal 133, and injects into the third cavity 1311. The oil then enters the fourth cavity 1312 through the third cavity 1311. When the third cavity 1311 and the fourth cavity 1312 are filled with oil, the oil pressure inside and outside the second seal 133 is the same. However, the sum of the oil pressure injected from the second main channel 112 and the elastic force of the second elastic element 132 is greater than the elastic force of the fifth elastic element 1342, causing the second seal 133 to isolate the third cavity 1311 and the second oil channel 1313. At this point, the second seal 133 and the third cavity 1311... The fourth cavity 1312 and the second piston 135 together form a sealed cavity filled with oil. Since the oil in the sealed cavity cannot be discharged and external oil cannot enter the sealed cavity, the second seal 133, the third cavity 1311, the fourth cavity 1312 and the second piston 135 constitute a rigid structure. The brake cam 240 can drive the brake rocker arm 131 to rotate relative to the connecting shaft 110 through the second roller 1314, thereby driving the first valve 320 to move through the first valve bridge 310. Therefore, in the braking state, the camshaft mechanism 200 drives the first valve mechanism 300 to move through the brake rocker arm 131, and at this time the exhaust rocker arm 121 is ineffective.

[0050] The rocker arm mechanism 100 provided in this embodiment of the utility model has a first main flow channel 111 on the connecting shaft 110; the exhaust rocker arm assembly 120 includes an exhaust rocker arm 121, a first elastic element 122, a first sealing element 123, a first limiting unit 124, and a first piston 125. The exhaust rocker arm 121 is sleeved outside the connecting shaft 110, and the exhaust rocker arm 121 has a first cavity 1211 and a second cavity 1212 that are interconnected. The first cavity 1211 is connected to the first main flow channel through a first oil passage 1213. The first seal 123 is disposed in the first cavity 1211. One end of the first seal 123 is connected to the first elastic member 122, and the other end is connected to the first limiting unit 124. The first seal 123 is used to separate the first cavity 1211 and the first oil passage 1213. The first limiting unit 124 is used to push the first seal 123 open against the elastic force of the first elastic member 122. The first piston 125 is slidably disposed in the second cavity 1212. The first piston 125 is used to... The first valve mechanism 300 is connected; the brake rocker arm assembly 130 includes a brake rocker arm 131, a second elastic element 132, a second seal 133, a second limiting unit 134, and a second piston 135. The brake rocker arm 131 is arranged side by side with the exhaust rocker arm 121 and is sleeved outside the connecting shaft 110. The brake rocker arm 131 has a third cavity 1311 and a fourth cavity 1312 that are interconnected. The third cavity 1311 is connected to the first main flow channel 111 through the second oil passage 1313. The second seal... The second seal 133 is disposed in the third cavity 1311. One end of the second seal 133 is connected to the second elastic member 132, and the other end is connected to the second limiting unit 134. The second seal 133 is used to isolate the third cavity 1311 and the second oil passage 1313. The second limiting unit 134 is used to lock the second seal 133 in coordination with the elastic force of the second elastic member 132. The second piston 135 is slidably disposed in the fourth cavity 1312. The second piston 135 is used to connect with the first valve mechanism 300. Compared with the prior art, the rocker arm mechanism 100 provided by this utility model adopts the braking rocker arm 131 and the exhaust rocker arm 121 arranged side by side, as well as the first cavity 1211 and the third cavity 1311, which are all connected to the first main channel 111. Therefore, it can realize the rapid switching between HLA rocker arm function and braking rocker arm function. On the one hand, it automatically eliminates valve clearance, and on the other hand, it automatically adjusts the clearance increased due to wear. It has multiple functions and meets user needs. This results in good stability and a long service life for the engine's valve train with 10 valves.

[0051] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rocker arm mechanism, characterized in that, It includes a connecting shaft, an exhaust rocker arm assembly, and a brake rocker arm assembly, wherein the connecting shaft has a first main channel; The exhaust rocker arm assembly includes an exhaust rocker arm, a first elastic element, a first seal, a first limiting unit, and a first piston. The exhaust rocker arm is sleeved outside the connecting shaft. The exhaust rocker arm has a first cavity and a second cavity that are interconnected. The first cavity is connected to the first main channel through a first oil passage. The first seal is disposed in the first cavity. One end of the first seal is connected to the first elastic element, and the other end is connected to the first limiting unit. The first seal is used to isolate the first cavity from the first oil passage. The first limiting unit is used to push the first seal open against the elastic force of the first elastic element. The first piston is slidably disposed in the second cavity. The first piston is used to connect to the first valve mechanism. The brake rocker arm assembly includes a brake rocker arm, a second elastic element, a second seal, a second limiting unit, and a second piston. The brake rocker arm is arranged side by side with the exhaust rocker arm and sleeved outside the connecting shaft. The brake rocker arm has a third cavity and a fourth cavity that communicate with each other. The third cavity is connected to the first main flow channel through a second oil passage. The second seal is disposed in the third cavity. One end of the second seal is connected to the second elastic element, and the other end is connected to the second limiting unit. The second seal is used to isolate the third cavity from the second oil passage. The second limiting unit is used to lock the second seal in conjunction with the elastic force of the second elastic element. The second piston is slidably disposed in the fourth cavity and is used to connect with the first valve mechanism.

2. The rocker arm mechanism according to claim 1, characterized in that, The first limiting unit includes a first connecting rod and a third elastic element. The connecting shaft also has a second main channel. The exhaust rocker arm has a fifth cavity. The first connecting rod is slidably mounted in the fifth cavity and extends into the first cavity and is connected to the first seal. The third elastic element is connected to the first connecting rod. The elastic force applied by the third elastic element to the first connecting rod is in the same direction as the elastic force applied by the first elastic element to the first seal, and is opposite to the pressure applied by the oil entering the fifth cavity from the second main channel to the first connecting rod.

3. The rocker arm mechanism according to claim 2, characterized in that, A limiting platform is provided at the end of the first connecting rod away from the first seal, and a limiting groove is provided in the fifth cavity. The limiting platform and the limiting groove are slidably engaged. The first elastic element is sleeved outside the first connecting rod and is provided on one side of the limiting platform. The inlet of the fifth cavity is provided on the other side of the limiting platform.

4. The rocker arm mechanism according to claim 1, characterized in that, The first piston is provided with a limiting shoulder, and the second cavity is provided with a stepped end face. The exhaust rocker arm assembly also includes a fourth elastic element, which is disposed in the second cavity and connected to the first piston. The fourth elastic element is used to apply elastic force to the first piston so that the limiting shoulder abuts against the stepped end face.

5. The rocker arm mechanism according to claim 1, characterized in that, The second limiting unit includes a second connecting rod and a fifth elastic element. The connecting shaft also has a second main channel. The brake rocker arm has a sixth cavity. The second connecting rod is slidably mounted in the sixth cavity and extends into the third cavity, and is connected to the second seal. The fifth elastic element is connected to the second connecting rod. The elastic force applied by the fifth elastic element to the second connecting rod is opposite in direction to the elastic force applied by the second elastic element to the second seal, and is also opposite in direction to the pressure applied by the oil entering the sixth cavity from the second main channel to the second connecting rod.

6. The rocker arm mechanism according to claim 5, characterized in that, A limiting sleeve is provided at the end of the second connecting rod away from the first sealing element. The limiting sleeve slides in fit with the inner wall of the sixth cavity. A limiting flange is provided inside the sixth cavity. The fifth elastic element is sleeved outside the limiting flange and is located on one side of the limiting sleeve. The inlet of the sixth cavity is located on the other side of the limiting sleeve.

7. The rocker arm mechanism according to claim 1, characterized in that, The brake rocker arm assembly further includes a fixed post and a sixth elastic element. The fixed post is installed on the brake rocker arm and extends into the fourth cavity. The second piston is sleeved on the fixed post, and a limit ring is provided at the opening of the second piston. The limit ring slides with the fixed post. A retaining ring is provided at the free end of the fixed post. The sixth elastic element is sleeved on the fixed post, with one end abutting against the retaining ring and the other end abutting against the limit ring.

8. The rocker arm mechanism according to claim 1, characterized in that, The rocker arm mechanism further includes an intake rocker arm assembly, which includes an intake rocker arm, a seventh elastic element, a third seal, and a third piston. The intake rocker arm is located on the side of the exhaust rocker arm away from the brake rocker arm and is sleeved outside the connecting shaft. The connecting shaft also has a second main flow channel. The intake rocker arm has a seventh cavity and an eighth cavity that are interconnected. The seventh cavity is connected to the second main flow channel through a third oil passage. The third seal is disposed in the seventh cavity and is connected to the seventh elastic member. The third seal is used to isolate the seventh cavity from the third oil passage. The third piston is slidably disposed in the eighth cavity and is used to connect with the second valve mechanism.

9. The rocker arm mechanism according to claim 8, characterized in that, The third piston is provided with a limiting protrusion, and the eighth cavity is provided with a stop end face. The intake rocker arm assembly also includes an eighth elastic element, which is disposed in the eighth cavity and connected to the third piston. The eighth elastic element is used to apply elastic force to the third piston so that the limiting protrusion abuts against the stop end face.

10. An engine valve train, characterized in that, Includes the rocker arm mechanism as described in any one of claims 1-9.

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