Integrated rocker arm hydraulic clearance automatic adjusting engine valve driving device

Abstract

The utility model relates to the technical field of engine valve driving, in particular to an integrated rocker arm hydraulic clearance automatic adjusting engine valve driving device, which is characterized in that a main piston, an execution piston and a hydraulic clearance adjuster are arranged on a rocker arm body, and an auxiliary piston is arranged on a valve bridge body and is connected with a driving valve; the driving oil way is communicated with the main piston, the execution piston, the auxiliary piston and the control valve, the driving oil way is opened, the main piston and the auxiliary piston achieve hydraulic linkage, and the driving air valve is opened; in the main lift process, the driving oil way between the main piston and the auxiliary piston is disconnected, and the auxiliary piston automatically resets. And the main piston absorbs the driving lift of the integrated cam to the rocker arm body, and the driving lift is not transmitted to the driving valve. In the whole valve moving process, the valve is automatically adjusted in a gapless hydraulic mode, noise is lowered, timing accuracy is improved, and meanwhile the problem that the valve driving function and the hydraulic gap adjusting function are compatible is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine valve driving devices, in particular to an engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment. Background Art

[0002] The concept and operation of compression release engine brakes are well known in the heavy commercial vehicle industry. Cost, power, reliability and engine modification requirements are often factors in determining whether an engine brake will be employed. There are several different types of compression release engine brakes in use, with valve train integrated engine brake systems becoming more popular due to their low cost, high performance and reliability, and compact construction.

[0003] The Chinese patent application number CN 202011384578.3 submitted by the applicant in December 2020 discloses a self-resetting single-valve dual-piston hydraulic drive device and method for an overhead cam engine, which mainly utilizes the hydraulic linkage of the driving main piston and the auxiliary piston during the driving lift. During the main lift, the auxiliary piston automatically resets, and the driving main piston also has a hydraulic clearance adjustment function to eliminate the noise, impact and wear caused by the valve clearance, and reduce the frequency of maintenance. However, the driving main piston can only play the hydraulic clearance adjustment function during the driving lift, and the hydraulic clearance adjustment cannot be performed throughout the entire process. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to solve the problem that the integrated rocker arm valve driving device in the prior art cannot perform hydraulic clearance adjustment throughout the entire process, and the addition of a hydraulic clearance adjuster is prone to excessive extension during the driving lift process, an integrated rocker arm hydraulic clearance automatic adjustment engine valve driving device is now provided.

[0005] The technical solution adopted by the utility model to solve the technical problem is: an engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment, comprising:

[0006] The rocker arm assembly comprises a rocker arm body, a driving oil circuit and an oil supply circuit, wherein the rocker arm body is rotatably mounted on the rocker arm shaft; the rocker arm body comprises a hydraulic clearance adjuster, a main piston slidably mounted in a main piston hole, and an actuator piston slidably mounted in an actuator piston hole and arranged opposite to the valve bridge body;

[0007] An integrated cam comprises a base circle portion and a main lift boss and a drive lift boss arranged on the base circle portion;

[0008] A valve group having actuated valves and non-actuated valves;

[0009] The valve bridge assembly located below the hydraulic clearance adjuster and the actuator piston comprises a valve bridge body, the valve bridge body comprises an auxiliary piston slidably mounted in the auxiliary piston hole, the auxiliary piston arranged at one end of the valve bridge body and located below the actuator piston is connected to the driving valve, and the other end of the valve bridge body is connected to the non-driving valve; the hydraulic force bearing area of ​​the actuator piston is smaller than the hydraulic force bearing area of ​​the auxiliary piston;

[0010] And a control valve, the driving oil circuit passes through the main piston hole, the control valve, the actuator piston hole, the actuator piston and the auxiliary piston hole, and the oil supply circuit is used to supply oil to the driving oil circuit; wherein, when the control valve is closed, the main piston hole and the actuator piston hole are not connected, and the actuator piston hole leaks oil; when the control valve is opened, the main piston hole and the actuator piston hole are connected to each other, and when the integrated cam does not drive the valve bridge body to displace, the actuator piston is displaced under the action of hydraulic pressure to seal and contact the valve bridge body, so that the actuator piston hole and the auxiliary piston hole are connected, thereby realizing hydraulic linkage between the main piston and the auxiliary piston in the process of driving the lift boss to contact the main piston.

[0011] In the present scheme, when the integrated cam rotates to the base circle, the main piston is driven to extend under the action of the main piston oil channel hydraulic pressure and the main elastic element. At the same time, the hydraulic clearance adjuster also compensates the clearance between the hydraulic clearance adjuster and the valve bridge under the action of the hydraulic pressure, and makes the main piston contact the base circle of the integrated cam without clearance, so as to complete the hydraulic automatic adjustment of the valve without clearance. At the same time, an actuator piston is arranged on the linkage path of the main piston and the auxiliary piston. On the one hand, the valve bridge body is subjected to the hydraulic pressure difference toward the rocker arm body to balance the thrust of the valve bridge body generated by the hydraulic clearance adjuster on the valve bridge body toward the valve bridge body, so as to prevent the hydraulic clearance adjuster from being excessively extended during the driving lift and increasing the subsequent positive power lift of the valve; on the other hand, the actuator piston is in sealing contact with the valve bridge body to prevent leakage and improve the stability of the hydraulic linkage between the main piston and the auxiliary piston.

[0012] Furthermore, when the control valve is closed, the piston and the valve bridge body are separated by clearance.

[0013] In order to facilitate layout and improve the compactness of the structure, further, a main piston is arranged at one end of the rocker arm body, a hydraulic clearance adjuster and an actuator piston are arranged at the other end, and a control valve and a rocker arm shaft are arranged in the middle.

[0014] In order to facilitate layout and improve the compactness of the structure, further, the actuator piston is located between the rocker arm shaft and the hydraulic clearance adjuster.

[0015] In order to facilitate the resetting of the main piston and the actuator piston after hydraulic linkage, the main piston further includes a main piston body and a main elastic element. The main piston body is slidably installed in the main piston hole. A main limiting unit is provided on the main piston body to limit the moving distance of the main piston body along its axial direction. The main elastic element is provided between the main piston body and the rocker arm body, and the main elastic element is used to provide a force for the main piston body to move away from the rocker arm body to a limited position.

[0016] Furthermore, an adjusting bolt for adjusting the axial position of the main piston is installed on the rocker arm body.

[0017] In order to facilitate the resetting of the actuator piston after hydraulic linkage, the actuator piston further includes an actuator piston body and an actuator elastic element, the actuator elastic element is used to provide a resetting force for the actuator piston to move toward the rocker arm body, and an actuator piston limiting unit is provided at the actuator piston hole, and the actuator piston limiting unit is used to limit the maximum axial stroke of the actuator piston body in the actuator piston hole.

[0018] In order to achieve stable sealing contact between the actuator piston and the valve bridge body, the actuator piston body is further provided with an actuator piston joint part and an actuator piston joint seat, and a spherical pair connection or a rotational pair connection is formed between the actuator piston joint seat and the actuator piston joint part, and the actuator piston joint seat is used for sealing contact with the side surface of the valve bridge body close to the rocker arm body.

[0019] Further, the driving oil circuit includes a main piston oil passage, an actuator piston oil passage and an oil drain passage, the actuator piston body is provided with an inner oil passage extending toward the oil drain passage, the inner oil passage is communicated with the actuator piston hole, the side surface of the valve bridge body close to the rocker arm body is a valve bridge limit surface, the auxiliary piston hole is located on the side of the valve bridge body away from the rocker arm body, one end of the oil drain passage is located on the valve bridge limit surface, and the other end is communicated with the auxiliary piston hole, the main piston oil passage is connected between the main piston hole and the control valve, and the actuator piston oil passage is connected between the control valve and the actuator piston hole;

[0020] Among them, when the control valve is opened, the main piston oil channel is connected with the actuator piston oil channel through the control valve, and when the actuator piston presses against the valve bridge body, the internal oil channel is connected with the oil drain channel; when the control valve is closed, the main piston oil channel is disconnected from the actuator piston oil channel.

[0021] Further, the control valve comprises a control valve body, an elastic return element and a one-way mechanism, the control valve body is provided with a control valve main oil passage, a control valve auxiliary oil passage and a connecting passage, the control valve body is slidably arranged in the control valve hole, the control valve main oil passage and the control valve auxiliary oil passage are connected through the connecting passage, the one-way mechanism is arranged in the connecting passage, and is used for allowing the oil in the control valve main oil passage to enter the control valve auxiliary oil passage in one direction, and the elastic return element is used for driving the control valve body to reset;

[0022] The oil supply path includes a control valve oil supply channel and a rocker arm oil supply channel, and the control valve oil supply channel is connected to one end of the control valve hole;

[0023] When the pressure of the oil in the control valve hole from the control valve oil supply channel on the control valve body is greater than the elastic force of the elastic return element, the control valve body is in the open position, the main piston oil channel is connected with the actuator piston oil channel through the control valve auxiliary oil channel, and the rocker arm oil supply channel is connected with the control valve main oil channel;

[0024] When the pressure of the oil flowing into the control valve hole from the control valve oil supply channel on the control valve body is less than the elastic force of the elastic return element, the elastic return element drives the control valve body to move to the closed position, and the main piston oil channel is connected with the rocker arm oil supply channel through the control valve auxiliary oil channel, executing the piston oil channel to drain oil.

[0025] Furthermore, the rocker arm oil supply channel is connected to a regulator oil supply channel, and the regulator oil supply channel is used to supply oil to the hydraulic clearance adjuster.

[0026] The beneficial effects of the utility model are as follows: the integrated rocker arm hydraulic clearance automatic adjustment engine valve drive device of the utility model can realize valve hydraulic clearance-free automatic adjustment during the entire valve movement process, reduce engine noise and improve engine timing accuracy, and solve the problem of mismatch between the valve drive device and the hydraulic clearance adjuster and inability to automatically adjust the valve clearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a two-dimensional schematic diagram of the utility model when the integrated cam rotates to the base circle position when the engine is in positive power state and the control valve disconnects the drive oil circuit;

[0029] Figure 2 It is a two-dimensional schematic diagram of the rocker arm assembly in the utility model;

[0030] Figure 3 It is a two-dimensional schematic diagram of the valve bridge assembly in the utility model;

[0031] Figure 4It is a two-dimensional schematic diagram of the utility model when the engine is in positive power state, the control valve disconnects the drive oil circuit, and the integrated cam rotates to the drive lift boss for "idling";

[0032] Figure 5 It is a two-dimensional schematic diagram of the utility model when the engine is in positive power state, the control valve disconnects the drive oil circuit, and the integrated cam rotates to the main lift boss;

[0033] Figure 6 It is a two-dimensional schematic diagram of the utility model when the engine is driven, the control valve is in the open position, and the integrated cam drives the valve to open during the lift process;

[0034] Figure 7 It is a schematic diagram of the main piston in the utility model;

[0035] Figure 8 It is a schematic diagram of the execution piston in the utility model;

[0036] Fig. 9 It is a schematic diagram of the control valve in the utility model;

[0037] In the figure: 1. Rocker arm assembly:

[0038] 11. Rocker arm body: 111. Main piston hole, 112. Actuator piston hole, 113. Control valve hole;

[0039] 12. Driving oil circuit: 121, main piston oil channel, 122, actuator piston oil channel;

[0040] 13. Main piston: 131. Main piston body, 132. Adjusting bolt, 133. Main elastic element, 134. Main limiting unit, 135. Main piston cam contact surface;

[0041] 14. Hydraulic lash adjuster;

[0042] 15. Actuating piston: 151. Actuating piston body, 152. Actuating elastic element, 153. Internal oil passage, 154. Actuating piston joint, 155. Actuating piston limiting unit, 156. Actuating piston joint seat.

[0043] 16. Control valve: 161. Control valve body, 161a. Control valve main oil passage, 161b. Control valve auxiliary oil passage, 161c. Communication passage, 162. One-way mechanism, 162a. One-way valve ball, 162b. One-way spring, 163. Elastic return element, 164. Opening cavity;

[0044] 17. Rocker arm shaft;

[0045] 18. Oil supply circuit: 181, control valve oil supply channel, 182, rocker arm oil supply channel;

[0046] 2. Integrated cam:

[0047] 21. base circle, 22. main lift boss, 23. drive lift boss;

[0048] 3. Valve group: 31, driven valve, 32, non-driven valve;

[0049] 4. Valve bridge assembly:

[0050] 41. Valve bridge body: 411. Valve bridge limit surface, 412. Oil drain channel, 413. Secondary piston hole, 414. Valve groove;

[0051] 42. Auxiliary piston: 421. Auxiliary piston valve seat. DETAILED DESCRIPTION

[0052] The utility model is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model, and the directions and references (for example, up, down, left, right, etc.) can only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0053] Example 1

[0054] like Figure 1-9 As shown, an engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment comprises:

[0055] The rocker arm assembly 1 comprises a rocker arm body 11, a driving oil circuit 12 and an oil supply circuit 18. The rocker arm body 11 is rotatably mounted on a rocker arm shaft 17. The rocker arm body 11 comprises a hydraulic clearance adjuster 14, a main piston 13 slidably mounted in a main piston hole 111, and an actuator piston 15 slidably mounted in an actuator piston hole 112 and arranged opposite to a valve bridge body 41.

[0056] The integrated cam 2 has a base circle portion 21 and a main lift boss 22 and a drive lift boss 23 arranged on the base circle portion 21;

[0057] A valve group 3, comprising a driven valve 31 and a non-driven valve 32;

[0058] The valve bridge assembly 4 located below the hydraulic clearance adjuster 14 and the actuator piston 15 has a valve bridge body 41, and the valve bridge body 41 has a secondary piston 42 slidably mounted in the secondary piston hole 413. The secondary piston 42 disposed at one end of the valve bridge body 41 and located below the actuator piston 15 is connected to the driving valve 31, and the other end of the valve bridge body 41 is connected to the non-driving valve 32; the hydraulic force area of ​​the actuator piston 15 is smaller than the hydraulic force area of ​​the secondary piston 42, so that the valve bridge body 41 is subjected to a hydraulic pressure difference in the direction of the rocker arm body 11 during the driving lift;

[0059] And the control valve 16, the driving oil circuit 12 passes through the main piston hole 111, the control valve 16, the actuator piston hole 112, the actuator piston 15 and the auxiliary piston hole 413, and the oil supply circuit 18 is used to supply oil to the driving oil circuit 12; wherein, when the control valve 16 is closed, the main piston hole 111 and the actuator piston hole 112 are not connected, the actuator piston hole 112 leaks oil, and the actuator piston 15 is separated from the valve bridge body 41 by a gap; when the control valve 16 is opened, the main piston hole 111 and the actuator piston hole 112 are connected to each other, and when the integrated cam 2 does not drive the valve bridge body 41 to move, the actuator piston 15 is displaced under the action of hydraulic pressure to seal and contact the valve bridge body 41, so that the actuator piston hole 112 and the auxiliary piston hole 413 are connected, thereby realizing hydraulic linkage between the main piston 13 and the auxiliary piston 42 in the process of driving the lift boss 23 to contact the main piston 13.

[0060] A main piston 13 is arranged at one end of the rocker arm body 11, and a hydraulic clearance adjuster 14 and an actuator piston 15 are arranged at the other end, and a control valve 16 and a rocker arm shaft 17 are arranged in the middle. The main piston 13, the integrated cam 2, the actuator piston 15, the hydraulic clearance adjuster 14 and the valve bridge body 41 are all located below the rocker arm body 11, and the integrated cam 2 is located directly below the main piston 13; the actuator piston 15 is located between the rocker arm shaft 17 and the hydraulic clearance adjuster 14. This layout can improve the stability of the structure and enhance the load-bearing capacity of the rocker arm body 11.

[0061] The specific structure of the hydraulic lash adjuster 14 is conventional.

[0062] like Figure 7As shown, in this embodiment, the main piston 13 includes a main piston body 131 and a main elastic element 133. The main piston hole 111 is arranged on the rocker arm body 11 and the opening faces downward. The main piston body 131 is coaxially slidably installed in the main piston hole 111. An adjusting bolt 132 can also be arranged between the main piston body 131 and the main piston hole 111 to adjust and fix the installation position of the main piston 13 on the rocker arm body 11. The main elastic element 133 is arranged between the main piston body 131 and the adjusting bolt 132, and is used to push the main piston 13 to reset downward. The main elastic element 133 can specifically adopt a compression spring. At the same time, the main piston body 131 can also be provided with a main limiting unit 134 to limit the distance that the main piston body 131 moves downward along its axial direction; wherein, a main piston cam contact surface 135 is arranged at the lower end of the main piston 13, and the main piston cam contact surface 135 can be a sliding contact surface or a rolling contact surface.

[0063] like Figure 8 As shown, in this embodiment, the actuator piston 15 includes an actuator piston body 151 and an actuator elastic element 152. The actuator piston hole 112 is arranged on the rocker arm body 11 and the opening faces downward. The actuator piston body 151 is coaxially and slidably arranged in the actuator piston hole 112. An actuator piston limiting unit 155 is arranged at the actuator piston hole 112. The actuator piston limiting unit 155 is used to limit the maximum axial stroke of the actuator piston body 151 in the actuator piston hole 112. The actuator elastic element 152 is arranged in the actuator piston hole 112 to push the actuator piston body 151 to reset upward. The actuator elastic element 152 can specifically adopt a compression spring.

[0064] In order to achieve stable sealing contact between the actuator piston 15 and the valve bridge body 41, the actuator piston body 151 is provided with an actuator piston joint portion 154 and an actuator piston joint seat 156. A spherical pair connection or a rotational pair connection is formed between the actuator piston joint seat 156 and the actuator piston joint portion 154. The actuator piston joint seat 156 is used for sealing contact with the side surface of the valve bridge body 41 close to the rocker arm body 11.

[0065] like Figure 1As shown, the driving oil circuit 12 includes a main piston oil passage 121, an actuator piston oil passage 122 and an oil drain passage 412. The main piston oil passage 121 and the actuator piston oil passage 122 are both provided in the rocker arm body 11 to improve the hydraulic bearing capacity. The oil drain passage 412 is provided on the valve bridge body 41. The actuator piston body 151 has an inner oil passage 153 extending toward the oil drain passage 412. The inner oil passage 153 is connected to the actuator piston hole 112. The inner oil passage 153 sequentially penetrates the actuator piston body 151, the actuator piston joint portion 154 and the actuator piston joint seat 156. The valve bridge body 41 is close to the rocker arm body 11 on one side. The surface is the valve bridge limiting surface 411, the bottom surface of the hydraulic clearance adjuster 14 is against the valve bridge limiting surface 411, the secondary piston hole 413 is located on the side of the valve bridge body 41 away from the rocker arm body 11, one end of the oil leakage passage 412 is located on the valve bridge limiting surface 411, and the other end is connected to the secondary piston hole 413, the main piston oil passage 121 is connected between the main piston hole 111 and the control valve 16, and the actuator piston oil passage 122 is connected between the control valve 16 and the actuator piston hole 112; in this embodiment, when the actuator piston 15 is in sealing contact with the valve bridge body 41 under the action of hydraulic pressure, the oil leakage passage 412 is located directly below the inner oil passage 153.

[0066] Among them, when the control valve 16 is opened, the main piston oil channel 121 is connected with the actuator piston oil channel 122 through the control valve 16, and when the actuator piston 15 is against the valve bridge body 41, the internal oil channel 153 is connected with the oil drain channel 412; when the control valve 16 is closed, the main piston oil channel 121 is disconnected from the actuator piston oil channel 122.

[0067] like Fig. 9 As shown, the control valve 16 includes a control valve body 161, an elastic return element 163 and a one-way mechanism 162. The control valve body 161 is provided with a control valve main oil passage 161a, a control valve auxiliary oil passage 161b and a connecting passage 161c. The control valve body 161 is slidably arranged in the control valve hole 113. The control valve hole 113 is arranged on the rocker arm body 11 and the opening faces upward. The control valve main oil passage 161a and the control valve auxiliary oil passage 161b are connected through the connecting passage 161c. The one-way mechanism 162 is arranged in the connecting passage 161c to allow the oil in the control valve main oil passage 161a to flow into the control valve main oil passage 161a. The oil enters the control valve auxiliary oil passage 161b in one direction. The one-way mechanism 162 can directly adopt a one-way valve, or can include a one-way valve ball 162a and a one-way spring 162b. The one-way valve ball 162a presses downward against the communication passage 161c under the action of the one-way spring 162b. When the pressure in the control valve main oil passage 161a is greater than the pressure in the control valve auxiliary oil passage 161b, the one-way mechanism 162 opens the communication passage 161c. When the pressure in the control valve main oil passage 161a is less than the pressure in the control valve auxiliary oil passage 161b, the one-way mechanism 162 closes the communication passage 161c.

[0068] The elastic return element 163 is disposed at the upper end of the control valve hole 113 to drive the control valve body 161 to move downward to reset. The elastic return element 163 can be specifically a compression spring.

[0069] The oil supply path 18 includes a control valve oil supply passage 181 and a rocker arm oil supply passage 182. The control valve oil supply passage 181 is disposed in the rocker arm body 11 and communicates with the bottom of the control valve hole 113.

[0070] When the pressure of the oil in the control valve hole 113 from the control valve oil supply passage 181 on the control valve body 161 is greater than the elastic force of the elastic return element 163, the control valve body 161 is in the open position, the main piston oil passage 121 is connected to the actuator piston oil passage 122 through the control valve auxiliary oil passage 161b, and the rocker arm oil supply passage 182 is connected to the control valve main oil passage 161a;

[0071] When the pressure of the oil in the control valve oil supply passage 181 flowing into the control valve hole 113 on the control valve body 161 is less than the elastic force of the elastic return element 163, the elastic return element 163 drives the control valve body 161 to move to the closed position, the main piston oil passage 121 is connected with the rocker arm oil supply passage 182 through the control valve auxiliary oil passage 161b, and the actuator piston oil passage 122 is connected with the open cavity 164 to leak oil to the outside; wherein, when the control valve 16 is in the closed position, the upper part of the control valve body 161 in the control valve hole 113 forms an open cavity 164 connected with the outside;

[0072] The control valve 16 in this embodiment may also be other valves with the same function in the prior art.

[0073] The rocker arm oil supply passage 182 is connected with a regulator oil supply passage, and the regulator oil supply passage is used to supply oil to the hydraulic lash adjuster 14;

[0074] In this embodiment, the rocker arm oil supply channel 182 keeps supplying oil to the main piston oil channel 121 and the regulator oil supply channel. The control valve oil supply channel 181 can be controlled by the engine's solenoid valve. When the engine's solenoid valve is closed, the rocker arm oil supply channel 182 has no oil pressure. When the engine's solenoid valve is opened, the rocker arm oil supply channel 182 starts to fill oil to the bottom of the control valve hole 113.

[0075] The engine in this embodiment is a four-stroke engine, and the driving valve 31 and the non-driving valve 32 are both exhaust valves in the engine. In this embodiment, there can be two driving lift bosses 23 on the base circle portion 21, namely an exhaust gas recirculation lift boss and a compression release driving lift boss. The exhaust gas recirculation lift boss is used to enable the driving valve 31 to perform an exhaust gas recirculation operation, and the compression release driving lift boss is used to enable the driving valve 31 to perform a compression release operation.

[0076] The working principle of this embodiment is:

[0077] The camshaft of the engine drives the integrated cam 2 to rotate;

[0078] When the solenoid valve of the engine is closed, the control valve oil supply passage 181 has no oil pressure, and the control valve 16 is in a closed state: the control valve 16 is in a reset closed position and connects the main piston oil passage 121 and the rocker arm oil supply passage 182. At the same time, the control valve 16 opens the actuator piston oil passage 122, and the actuator piston oil passage 122 is depressurized, so that the actuator piston 15 is separated from the valve bridge body 41 after no hydraulic reset;

[0079] When the integrated cam 2 rotates to the base circle 21 and contacts the main piston 13, the main piston 13 extends under the action of the hydraulic pressure of the main piston oil passage 121 and the main elastic element 133, and at the same time, the hydraulic clearance adjuster 14 also compensates the gap between the hydraulic clearance adjuster 14 and the valve bridge body 41 under the action of the hydraulic pressure, and makes the main piston 13 contact the base circle 21, completing the gapless hydraulic automatic adjustment of the valve;

[0080] When the integrated cam 2 rotates to the driving lift boss 23 and contacts the main piston 13, the main piston 13 absorbs the driving lift of the integrated cam 2 and retracts, the rocker arm body 11 does not move, the integrated cam 2 "idles", and the lift of the driving lift boss 23 is not transmitted to the side where the valve group 3 is located;

[0081] When the integrated cam 2 rotates to the main lift boss 22 and contacts the main piston 13, the main piston 13 completely retracts and is rigidly connected to the rocker arm body 11. The integrated cam 2 pushes the rocker arm body 11 to rotate through the main piston 13 and drives the valve bridge body 41 through the hydraulic clearance adjuster 14 to open the driving valve 31 and the non-driving valve 32, completing the normal valve clearance-free positive power lift.

[0082] When the solenoid valve of the engine is opened, the engine lubricating oil enters the control valve oil supply passage 181, and the control valve 16 is opened: under the hydraulic pressure of the control valve oil supply passage 181, the control valve 16 is in the open position, and the rocker arm oil supply passage 182 is connected with the drive oil circuit 12;

[0083] When the integrated cam 2 rotates to the base circle 21 and contacts the main piston 13, the main piston 13 extends under the action of the hydraulic pressure of the main piston oil passage 121 and the main elastic element 133, and the actuator piston 15 extends under the hydraulic pressure of the actuator piston oil passage 122, automatically compensating the gap between it and the valve bridge body 41, and contacts the valve bridge body 41, sealing and connecting the internal oil passage 153 and the oil drain passage 412, and at the same time, the hydraulic clearance adjuster 14 also compensates the gap between it and the valve bridge body 41 under the action of the hydraulic pressure, and makes the main piston 13 contact the cam base circle 21, completing the hydraulic automatic adjustment of the valve without clearance;

[0084] When the integrated cam 2 rotates to the driving lift boss 23 and contacts the main piston 13, the main piston 13 extends and retracts under the push of the driving lift boss 23, and the control valve 16 closes the driving oil circuit 12 due to hydraulic reflux, so that the main piston 13 and the auxiliary piston 42 form a hydraulic linkage, and the auxiliary piston 42 drives to open the driving valve 31 connected thereto, and the rocker arm body 11 and the valve bridge body 41 do not move, completing the valve clearance-free driving lift;

[0085] When the integrated cam 2 rotates to the main lift boss 22 and contacts the main piston 13, the main piston 13 is completely retracted and rigidly connected to the rocker arm body 11. The integrated cam 2 pushes the rocker arm body 11 to rotate through the main piston 13, and drives the valve bridge body 41 to open the driving valve 31 and the non-driving valve 32 through the hydraulic clearance adjuster 14. At the same time, the piston 15 is separated from the valve bridge body 41, the oil drain channel 412 is opened, and the secondary piston hole 413 is drained and reset to complete the normal valve clearance-free positive power lift.

[0086] In this embodiment, the hydraulic clearance adjuster 14 is used to compensate for the clearance between it and the valve bridge body 41 under the action of hydraulic pressure, so as to realize full-range valve clearance-free hydraulic automatic adjustment. At the same time, an actuator piston 15 is set on the linkage path of the main piston 13 and the auxiliary piston 42. On the one hand, the valve bridge body 41 is subjected to an upward hydraulic pressure difference on the driving valve 31 side to balance the downward thrust generated by the hydraulic clearance adjuster 14 on the valve bridge body 41 in the middle part of the valve bridge body 41, thereby preventing the hydraulic clearance adjuster 14 from being excessively extended during the driving lift and increasing the subsequent valve positive power lift; on the other hand, the actuator piston 15 is in sealing contact with the valve bridge body 41 to prevent leakage and improve the stability of the hydraulic linkage between the main piston 13 and the auxiliary piston 42.

[0087] The above-mentioned ideal embodiments of the utility model are inspirations. Through the above-mentioned description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment, characterized in that: include: The rocker arm assembly (1) comprises a rocker arm body (11), a driving oil circuit (12) and an oil supply circuit (18); the rocker arm body (11) is rotatably mounted on a rocker arm shaft (17); the rocker arm body (11) comprises a hydraulic clearance adjuster (14), a main piston (13) slidably mounted in a main piston hole (111), and an actuator piston (15) slidably mounted in an actuator piston hole (112) and arranged opposite to a valve bridge body (41); An integrated cam (2) comprises a base circle (21) and a main lift boss (22) and a drive lift boss (23) arranged on the base circle (21); A valve assembly (3) having a driven valve (31) and a non-driven valve (32); A valve bridge assembly (4) located below a hydraulic clearance adjuster (14) and an actuator piston (15) comprises a valve bridge body (41), the valve bridge body (41) comprises an auxiliary piston (42) slidably mounted in an auxiliary piston hole (413), the auxiliary piston (42) arranged below the actuator piston (15) at one end of the valve bridge body (41) is connected to a driving valve (31), and the other end of the valve bridge body (41) is connected to a non-driving valve (32); the hydraulic force bearing area of ​​the actuator piston (15) is smaller than the hydraulic force bearing area of ​​the auxiliary piston (42); and a control valve (16); the driving oil circuit (12) passes through a main piston hole (111), a control valve (16), an actuating piston hole (112), an actuating piston (15) and a secondary piston hole (413); the oil supply circuit (18) is used to supply oil to the driving oil circuit (12); wherein when the control valve (16) is closed, the main piston hole (111) is not connected to the actuating piston hole (112), and the actuating piston hole (112) leaks oil; when the control valve (16) is opened, the main piston hole (111) is opened to the actuating piston hole (112); The hole (111) and the actuator piston hole (112) are connected to each other, and when the integrated cam (2) does not drive the valve bridge body (41) to move, the actuator piston (15) is displaced under the action of hydraulic pressure to seal and contact the valve bridge body (41), so that the actuator piston hole (112) and the auxiliary piston hole (413) are connected, thereby realizing hydraulic linkage between the main piston (13) and the auxiliary piston (42) in the process of driving the lift boss (23) to contact the main piston (13).

2. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 1, characterized in that: When the control valve (16) is closed, the piston (15) and the valve bridge body (41) are separated by a gap.

3. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 1, characterized in that: A main piston (13) is arranged at one end of the rocker arm body (11), a hydraulic clearance adjuster (14) and an actuator piston (15) are arranged at the other end, and a control valve (16) and a rocker arm shaft (17) are arranged in the middle.

4. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 3 is characterized in that: The actuator piston (15) is located between the rocker arm shaft (17) and the hydraulic clearance adjuster (14).

5. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 1, characterized in that: The main piston (13) comprises a main piston body (131) and a main elastic element (133). The main piston body (131) is slidably mounted in the main piston hole (111). A main limiting unit (134) is provided on the main piston body (131) for limiting the moving distance of the main piston body (131) along its axial direction. The main elastic element (133) is provided between the main piston body (131) and the rocker arm body (11). The main elastic element (133) is used to provide a force for the main piston body (131) to move to a limited position in a direction away from the rocker arm body (11).

6. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 1, characterized in that: An adjusting bolt (132) for adjusting the axial position of the main piston (13) is installed on the rocker arm body (11).

7. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 1, characterized in that: The actuator piston (15) comprises an actuator piston body (151) and an actuator elastic element (152), wherein the actuator elastic element (152) is used to provide a reset force for the actuator piston (15) to move toward the rocker arm body (11), and an actuator piston limit unit (155) is provided at the actuator piston hole (112), and the actuator piston limit unit (155) is used to limit the maximum axial stroke of the actuator piston body (151) in the actuator piston hole (112).

8. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 7, characterized in that: The actuator piston body (151) is provided with an actuator piston joint portion (154) and an actuator piston joint seat (156); a spherical pair connection or a rotation pair connection is formed between the actuator piston joint seat (156) and the actuator piston joint portion (154); the actuator piston joint seat (156) is used for sealing contact with a side surface of the valve bridge body (41) close to the rocker arm body (11).

9. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 7, characterized in that: The driving oil circuit (12) comprises a main piston oil passage (121), an actuator piston oil passage (122) and an oil drain passage (412); the actuator piston body (151) has an inner oil passage (153) extending toward the oil drain passage (412); the inner oil passage (153) is connected to the actuator piston hole (112); a side surface of the valve bridge body (41) close to the rocker arm body (11) is a valve bridge limit surface (411); the auxiliary piston hole (413) is located on a side of the valve bridge body (41) away from the rocker arm body (11); one end of the oil drain passage (412) is located on the valve bridge limit surface (411), and the other end is connected to the auxiliary piston hole (413); the main piston oil passage (121) is connected between the main piston hole (111) and the control valve (16); and the actuator piston oil passage (122) is connected between the control valve (16) and the actuator piston hole (112); When the control valve (16) is opened, the main piston oil passage (121) is connected to the actuator piston oil passage (122) through the control valve (16), and when the actuator piston (15) abuts against the valve bridge body (41), the internal oil passage (153) is connected to the oil drain passage (412); when the control valve (16) is closed, the main piston oil passage (121) is disconnected from the actuator piston oil passage (122).

10. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 9, characterized in that: The control valve (16) comprises a control valve body (161), an elastic return element (163) and a one-way mechanism (162); the control valve body (161) is provided with a control valve main oil passage (161a), a control valve auxiliary oil passage (161b) and a communication passage (161c); the control valve body (161) is slidably arranged in the control valve hole (113); the control valve main oil passage (161a) and the control valve auxiliary oil passage (161b) are connected through the communication passage (161c); the one-way mechanism (162) is arranged in the communication passage (161c) and is used for allowing the oil in the control valve main oil passage (161a) to enter the control valve auxiliary oil passage (161b) in one direction; the elastic return element (163) is used for driving the control valve body (161) to reset; The oil supply path (18) comprises a control valve oil supply passage (181) and a rocker arm oil supply passage (182), and the control valve oil supply passage (181) is in communication with one end of the control valve hole (113); When the pressure of the oil in the control valve hole (113) flowing through the control valve oil supply passage (181) on the control valve body (161) is greater than the elastic force of the elastic return element (163), the control valve body (161) is in an open position, the main piston oil passage (121) is connected to the actuator piston oil passage (122) through the control valve auxiliary oil passage (161b), and the rocker arm oil supply passage (182) is connected to the control valve main oil passage (161a); When the pressure of the oil in the control valve hole (113) flowing through the control valve oil supply channel (181) on the control valve body (161) is less than the elastic force of the elastic return element (163), the elastic return element (163) drives the control valve body (161) to move to the closed position, and the main piston oil channel (121) is connected to the rocker arm oil supply channel (182) through the control valve auxiliary oil channel (161b), and the piston oil channel (122) is drained.

11. The engine valve driving device with integrated rocker arm hydraulic clearance automatic adjustment according to claim 10, characterized in that: The rocker arm oil supply passage (182) is connected to a regulator oil supply passage, and the regulator oil supply passage is used to supply oil to the hydraulic clearance adjuster (14).

Images