Variable lift rocker arm structure and variable valve phase and lift rocker arm assembly structure

Abstract

The embodiment of the invention provides a variable lift rocker arm structure and a variable valve phase and lift rocker arm assembly structure, and relates to the technical field of rocker arms. According to the variable-lift rocker arm structure and the rocker arm assembly structure with the variable valve phase and lift, the variable-lift rocker arm structure comprising the rocker arm body and the auxiliary rocker arm structure is arranged, and the rocker arm body achieves switching of the extending position of the piston assembly through oil under the action of the auxiliary rocker arm structure; the first position is the first position or the second position, so that the first valve lift and the second valve lift generated by the valve are switched; on one hand, the eccentric wear influence on the tappets when double rollers or double tappets are switched in the prior art can be reduced to a certain extent; on the other hand, the number of parts is reduced, the mass is reduced, and the overall rotational inertia of the variable lift rocker arm structure is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rocker arm, in particular to a variable lift rocker arm structure and a rocker arm assembly structure with variable valve phase and lift. BACKGROUND

[0002] An internal combustion engine is a complex machine that operates under very complex working conditions, and it fluctuates between a very large range of speed and torque. When high speed and large torque are required, as much fresh air as possible is needed, and when low speed and small torque are required, less fresh air is needed. Therefore, the theoretical intake amount required by the internal combustion engine is constantly changing during actual operation. The opening and closing of the internal combustion engine valve need to be changed according to the actual demand, and the valve lift needs to be changed to achieve the adjustment of the valve intake amount. The variable valve lift mechanism of the internal combustion engine can be realized by variable cam, double rocker arm switching or variable valve bridge.

[0003] The variable cam method in the prior art can be realized by changing the cam position or switching the cam and the rocker arm roller, and a complex conversion mechanism and a servo motor are often needed for control. However, the realization mechanism of the variable cam method is complex and has high cost. At the same time, the cam switching also needs a certain time, which is not conducive to timely adaptation to the change of the automobile driving condition, and relatively leads to slow change of the internal combustion engine working condition.

[0004] The variable height valve bridge in the prior art realizes the change of the valve lift by changing the height of the valve bridge. The variable height valve bridge method is limited by the space around the valve bridge, and is not convenient to apply to engines with different displacements. In addition, the control oil way needs to be extended from the electromagnetic valve to the inside of the valve bridge, the control oil way is long, the response is slow, and it is not conducive to timely adaptation to the change of the automobile driving condition, and relatively leads to slow change of the internal combustion engine working condition. SUMMARY

[0005] The purpose of the present application includes providing a variable lift rocker arm structure and a rocker arm assembly structure with variable valve phase and lift, which can switch the extension position of the piston assembly, i.e. the first position or the second position, by the auxiliary rocker arm structure, and further switch the first valve lift and the second valve lift generated by the valve.

[0006] The embodiments of the present application can be realized as follows: In a first aspect, the present application provides a variable lift rocker arm structure, comprising: a rocker arm body, the rocker arm body is movably arranged on a rocker arm shaft, the rocker arm shaft is provided with a rocker arm shaft oil way, the rocker arm body is provided with a first cavity, the first cavity is movably provided with a piston assembly connected with a valve transmission, the piston assembly has a first position and a second position; An auxiliary rocker arm structure is fixed on the rocker shaft, the auxiliary rocker arm structure comprises a one-way valve assembly and a tappet assembly, the one-way valve assembly is provided with a hydraulic cavity and a second cavity, the hydraulic cavity is communicated with the rocker shaft oil passage, the second cavity is communicated with the first cavity and the hydraulic cavity respectively, and the tappet assembly is movably arranged in the second cavity; The electromagnetic valve is opened, and the piston assembly is extended from the first position to the second position; The electromagnetic valve is closed, and the piston assembly is retracted from the second position to the first position.

[0007] In an optional embodiment, the one-way valve assembly comprises a transmission member movably arranged in the hydraulic cavity; The electromagnetic valve is opened, and the oil in the rocker shaft oil passage enters the hydraulic cavity, and the transmission member cuts off the oil passage between the rocker shaft oil passage and the hydraulic cavity; The electromagnetic valve is closed, and under the action of the valve, the oil in the first cavity returns to the rocker shaft oil passage through the hydraulic cavity, and the transmission member communicates the oil passage between the rocker shaft oil passage and the hydraulic cavity.

[0008] In an optional embodiment, the hydraulic cavity comprises a third cavity, a fourth cavity and a channel, the second cavity is communicated with the fourth cavity, the fourth cavity is communicated with the third cavity through the channel, and the rocker shaft oil passage is communicated with the channel; The transmission member comprises a top block, a shaft rod, a blocking member and a first blocking elastic member, the top block is arranged in the third cavity, the blocking member and the first blocking elastic member are arranged in the fourth cavity, the shaft rod is movably arranged along the channel, one end of the shaft rod is connected with the blocking member, the other end of the shaft rod is abutted with one end of the top block, one end of the first blocking elastic member is abutted with the other end of the top block, and the other end of the first blocking elastic member is connected with the inner wall of the fourth cavity; The electromagnetic valve is opened, the oil in the rocker shaft oil passage enters the channel, and under the action of the oil, the top block drives the shaft rod to move along the channel towards the third cavity, so that the blocking member closes the channel under the action of the first blocking elastic member; The electromagnetic valve is closed, the top block drives the shaft rod to move along the channel towards the fourth cavity, the blocking member opens the channel under the action of the shaft rod, and under the action of the valve, the oil in the first cavity returns to the channel through the second cavity and the fourth cavity.

[0009] In an optional embodiment, the tappet assembly is used for driving connection with a second cam; The battery valve is opened, the one-way valve assembly cuts off the oil path between the rocker shaft oil path and the hydraulic cavity, the tappet assembly pushes the oil in the second cavity into the first cavity under the action of the second cam, so that the piston assembly extends from the first position to the second position, and the piston assembly is kept in the second position; The electromagnetic valve is closed, the one-way valve assembly connects the oil path between the rocker shaft oil path and the hydraulic cavity, and the oil in the first cavity returns to the rocker shaft oil path through the hydraulic cavity under the action of the valve, so that the piston assembly retracts from the second position to the first position, and the piston assembly is kept in the first position.

[0010] In an optional embodiment, the tappet assembly is a first tappet assembly, and the first tappet assembly extends along the second cavity to keep the first tappet assembly in constant contact with the second cam; The electromagnetic valve is opened, the first tappet assembly pushes the oil in the second cavity into the first cavity under the action of the second cam, so that the piston assembly extends from the first position to the second position.

[0011] In an optional embodiment, the first tappet assembly comprises a first tappet and a first elastic member, the first tappet is arranged in the second cavity, one end of the first tappet close to the second cavity is provided with a first limiting cavity, the first elastic member is arranged in the first limiting cavity in a limiting manner, one end of the first elastic member is connected with the inner wall of the first limiting cavity, and the other end of the first elastic member is connected with the inner wall of the second cavity. One end of the first tappet away from the second cavity is provided with a first roller.

[0012] In an optional embodiment, the tappet assembly is a second tappet assembly, the second tappet assembly retracts along the second cavity, and the second tappet assembly is in constant non-contact with the second cam; The electromagnetic valve is opened, the rocker shaft oil path supplies oil into the second cavity through the hydraulic cavity, the second tappet assembly extends along the second cavity and contacts with the second cam under the action of the oil, and the second tappet assembly pushes the oil in the second cavity into the first cavity under the action of the second cam, so that the piston assembly extends from the first position to the second position.

[0013] In an optional embodiment, the second tappet assembly comprises a second tappet, a second elastic member, a connecting shaft and a limiting member, the second tappet is arranged in the second cavity, one end of the second tappet close to the second cavity is provided with a second limiting cavity, and the limiting member is connected in the second limiting cavity in a limiting manner. The connecting shaft penetrates the rocker arm body, the limiting piece and the second limiting cavity, one end of the connecting shaft is provided with a limiting part in the second limiting cavity; the second elastic piece is arranged in the second limiting cavity, one end of the second elastic piece is connected with the limiting piece, and the other end is connected with the limiting part; The connecting part is provided with a flat bottom contact surface; or, the connecting part is provided with an arc-shaped contact surface.

[0014] In an optional embodiment, the variable-lift rocker arm structure further comprises a second roller, the second roller is used to be connected with the first cam in a transmission mode, under the action of the first cam, the second roller drives the variable-lift rocker arm structure to swing.

[0015] In a second aspect, the application provides a variable-lift and variable-phase rocker arm assembly structure, comprising the variable-lift rocker arm structure according to any one of the preceding embodiments.

[0016] The variable-lift rocker arm structure and the variable-lift and variable-phase rocker arm assembly structure provided by the embodiments of the application have the following beneficial effects: By arranging the variable-lift rocker arm structure comprising the rocker arm body and the auxiliary rocker arm structure, the rocker arm body is switched between the first position and the second position by the action of the auxiliary rocker arm structure through oil, so as to switch the first valve lift and the second valve lift generated by the valve. On the one hand, compared with the existing double-roller or double-lifter structure, the auxiliary rocker arm structure is arranged to switch the first valve lift and the second valve lift generated by the valve, without the need to switch the cam or the position of the cam, which can reduce the eccentric wear caused by the double-roller or double-lifter switching in the prior art to a certain extent. On the other hand, the components are reduced, the mass is reduced, and the rotational inertia of the variable-lift rocker arm structure as a whole is small. On the other hand, compared with the variable-height valve bridge mode in the prior art, the oil passage is integrated in the auxiliary rocker arm structure, the control oil passage is short, the response is fast, and the change of the automobile driving condition can be adapted in time. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1A bottom view of the variable lift rocker arm structure provided with a first tappet assembly provided in this embodiment; Figure 2 for Figure 1 Cross-sectional view of AA; Figure 3 A front view of a variable lift rocker arm structure provided with a first tappet assembly provided in this embodiment; Figure 4 for Figure 3 Cross-sectional view of the middle BB; Figure 5 for Figure 3 Cross-sectional view of CC; Figure 6 A front view of a variable lift rocker arm structure provided with a second tappet assembly provided in this embodiment; Figure 7 A cross-sectional view of a connection portion provided for this embodiment having a planar contact surface; Figure 8 A first cross-sectional view of the connecting portion provided in this embodiment having an arc-shaped contact surface; Figure 9 A second cross-sectional view of the connecting portion provided in this embodiment having an arc-shaped contact surface; Figure 10 A third cross-sectional view of the connecting portion provided in this embodiment having an arc-shaped contact surface; Figure 11 A cross-sectional view of the variable lift rocker arm structure provided in this embodiment at the first oil passage; Figure 12 Schematic diagram of the lift height difference of the variable lift rocker arm structure provided in this embodiment.

[0019] Icon: 010-variable lift rocker arm structure; 100 - rocker arm body; 101 - first cavity; 102 - fourth oil passage; 103 - shaft hole; 110 - rocker arm shaft; 120 - second roller; 200 - piston assembly; 210 - adjusting screw; 220 - piston; 230 - piston elastic member; 300 - first tappet assembly; 310 - first tappet; 320 - first elastic member; 330 - first roller; 400 - second tappet assembly; 410 - second tappet; 420 - second elastic member; 430 - connecting shaft; 431-limiting part; 440-limiting member; 450-connecting part; 500-one-way valve assembly; 501-second cavity; 502-third cavity; 503-fourth cavity; 504-channel; 505-first oil channel; 506-second oil channel; 507-third oil channel; 510-top block; 520-shaft; 530-sealing member; 540-second sealing elastic member; 550-first gasket; 560-first sealing elastic member; 570-screw plug; 580-valve seat. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0022] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0024] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0026] The overall structure, working principle and technical effects of the variable-lift rocker arm structure 010 and the rocker arm assembly structure of variable valve phase and lift provided by the present application will be described in detail below through embodiments and in combination with the accompanying drawings.

[0027] Please refer to Figure 1 The variable-lift rocker arm structure 010 provided by the present application is applied to the rocker arm assembly structure of variable valve phase and lift of a vehicle internal combustion engine.

[0028] Please refer to Figure 1 and Figure 6 The present application provides a variable-lift rocker arm structure 010, which comprises: The rocker body 100 is movably arranged on the rocker shaft 110, the rocker shaft 110 is internally provided with a rocker shaft oil passage, the rocker body 100 is provided with a first cavity 101, the first cavity 101 is movably provided with a piston assembly 200 connected with a valve actuation, the piston assembly 200 has a first position and a second position; The auxiliary rocker structure is fixed on the rocker shaft 110, the auxiliary rocker structure includes a one-way valve assembly 500 and a tappet assembly, the one-way valve assembly 500 is provided with a hydraulic cavity and a second cavity 501, the hydraulic cavity is communicated with the rocker shaft oil passage, the second cavity 501 is communicated with the first cavity 101 and the hydraulic cavity respectively, the tappet assembly is movably arranged in the second cavity 501; The electromagnetic valve is opened, the piston assembly 200 is extended from the first position to the second position; The electromagnetic valve is closed, the piston assembly 200 is retracted from the second position to the first position.

[0029] It can be understood that when the piston assembly 200 is in the normal first position, the rocker body 100 swings to drive the piston assembly 200 in the first position to push the valve to open, and at the same time the valve generates a first valve lift, i.e. a normal intake lift. Please see Figure 12 , Figure 12 The lift difference schematic diagram of the variable lift rocker structure 010 provided in the embodiment, Figure 12 The blue curve in the middle is the first valve lift curve.

[0030] When the piston assembly 200 is in the second position, the rocker body 100 swings to drive the piston assembly 200 in the second position to push the valve to open, and at the same time the valve generates a second valve lift. Please see Figure 12 , Figure 12 The lift difference schematic diagram of the variable lift rocker structure 010 provided in the embodiment, Figure 12 The orange curve in the middle is the second valve lift curve.

[0031] It should be noted that when the electromagnetic valve is opened, the one-way valve assembly 500 cuts off the oil passage between the rocker shaft oil passage and the hydraulic cavity, and the piston assembly 200 is extended from the first position to the second position under the action of the tappet assembly; then the valve is switched from the first valve lift to the second valve lift.

[0032] When the electromagnetic valve is closed, the one-way valve assembly 500 communicates the oil passage between the rocker shaft oil passage and the hydraulic cavity; under the action of the valve, the oil in the first cavity 101 can return to the rocker shaft oil passage through the hydraulic cavity, so that the piston assembly 200 is retracted from the second position to the first position; then the valve is switched from the second valve lift to the first valve lift.

[0033] Therefore, the application sets the variable lift rocker structure 010 including the rocker body 100 and the auxiliary rocker structure, the rocker body 100 is switched to the extended position of the piston assembly 200 by the oil under the action of the auxiliary rocker structure, that is, the first position or the second position, thereby realizing the switching of the first valve lift and the second valve lift generated by the valve; on the one hand, compared with the existing double roller or double tappet structure, the application can realize the switching of the first valve lift and the second valve lift generated by the valve by setting the auxiliary rocker structure, without switching the cam or the position of the cam, which can reduce the eccentric wear caused by the double tappet switching in the prior art to a certain extent; on the other hand, the components of the application are reduced, the mass is reduced, and the moment of inertia of the variable lift rocker structure 010 as a whole is small; on the other hand, compared with the variable height valve bridge mode in the prior art, the application integrates the oil circuit in the auxiliary rocker structure, the control oil circuit is short and fast in response, and can timely adapt to the change of the automobile driving condition.

[0034] In the embodiment, the variable lift rocker structure 010 includes the rocker body 100.

[0035] In the embodiment, please refer to Figure 2 and Figure 5 , the rocker body 100 is movably arranged on the rocker shaft 110, the rocker shaft 110 is provided with a rocker shaft oil circuit, the rocker body 100 is provided with a first cavity 101, and the first cavity 101 is movably provided with a piston assembly 200 connected with the valve.

[0036] Further, the rocker body 100 is provided with the first cavity 101, a shaft hole 103 and a fourth oil channel 102; the first cavity 101 is used for arranging the piston assembly 200; the shaft hole 103 penetrates the rocker body 100 and is used for arranging the rocker shaft 110, and the rocker shaft 110 is provided with a fifth oil channel.

[0037] The fifth oil channel is inclined and penetrates the rocker shaft 110, so as to communicate the second cavity 501 and the first cavity 101 through the fifth oil channel and the fourth oil channel 102.

[0038] In the embodiment, the variable lift rocker structure 010 further includes a second roller 120, the second roller 120 is used for being connected with the first cam in transmission, and under the action of the first cam, the second roller 120 drives the variable lift rocker structure 010 to swing.

[0039] In the embodiment, the variable lift rocker structure 010 includes the piston assembly 200.

[0040] The piston assembly 200 is used for being connected with the valve in transmission, so as to make the valve generate the valve lift.

[0041] In the embodiment, please refer to Figure 5 The piston assembly 200 comprises an adjusting screw 210, a piston 220 and a piston elastic member 230, the adjusting screw 210 and the piston 220 are located on opposite sides of the first cavity 101; the piston elastic member 230 is sleeved on the adjusting screw 210, one end of the piston elastic member 230 abuts against the inner wall of the first cavity 101, and the other end is limitedly connected with the limiting cavity of the piston 220.

[0042] It can be understood that when the electromagnetic valve is opened, the one-way valve assembly 500 cuts off the oil path between the rocker shaft oil path and the hydraulic cavity, and under the action of the tappet assembly, the oil in the second cavity 501 is pushed into the first cavity 101, and the oil pushes the piston 220 to extend along the first cavity 101 from the first position to the second position; when the electromagnetic valve is closed, the one-way valve assembly 500 connects the oil path between the rocker shaft oil path and the hydraulic cavity, and under the action of the valve, the oil in the first cavity 101 returns to the original path, and the piston 220 returns from the second position to the first position.

[0043] In the embodiment, the variable-lift rocker structure 010 comprises an electromagnetic valve.

[0044] In the embodiment, please refer to Figure 2 The electromagnetic valve is communicated with the hydraulic cavity of the one-way valve assembly 500. The rocker shaft 110 is further provided with a rocker shaft oil path, please refer to Figure 11 The electromagnetic valve is communicated with the passage 504 through the rocker shaft oil path on the rocker shaft 110 and the first oil channel 505 and the passage 504 on the one-way valve assembly 500.

[0045] It can be understood that the electromagnetic valve is opened and controls the oil to enter the passage 504, so that the one-way valve assembly 500 cuts off the oil path between the rocker shaft oil path and the hydraulic cavity; the electromagnetic valve is closed, the one-way valve assembly 500 connects the oil path between the rocker shaft oil path and the hydraulic cavity, and under the action of the valve, the oil in the first cavity 101 returns to the rocker shaft oil path through the hydraulic cavity.

[0046] In the embodiment, the variable-lift rocker structure 010 comprises an auxiliary rocker structure.

[0047] In the embodiment, the auxiliary rocker structure is fixed on the rocker shaft 110, and the auxiliary rocker structure comprises a one-way valve assembly 500 and a tappet assembly, the one-way valve assembly 500 is provided with a hydraulic cavity and a second cavity 501, the hydraulic cavity is communicated with the rocker shaft oil path, the second cavity 501 is communicated with the first cavity 101 and the hydraulic cavity respectively, and the tappet assembly is movably arranged in the second cavity 501.

[0048] In the embodiment, the one-way valve assembly 500 comprises a valve body and a transmission member, the valve body is provided with the second cavity 501 and the hydraulic cavity, and the second cavity 501 is communicated with the first cavity 101 and the hydraulic cavity respectively; wherein the transmission member is movably arranged in the hydraulic cavity.

[0049] It should be noted that the electromagnetic valve is opened, and the oil in the rocker shaft oil passage enters the hydraulic cavity, and the transmission member cuts off the oil passage between the rocker shaft oil passage and the hydraulic cavity.

[0050] The electromagnetic valve is closed, and the oil in the first cavity 101 returns to the rocker shaft oil passage through the hydraulic cavity under the action of the valve, and the transmission member communicates the oil passage between the rocker shaft oil passage and the hydraulic cavity.

[0051] In this embodiment, the hydraulic cavity includes a third cavity 502, a fourth cavity 503 and a passage 504; the third cavity 502, the fourth cavity 503 and the passage 504 are coaxially arranged, the second cavity 501 is communicated with the fourth cavity 503, and the fourth cavity 503 is communicated with the third cavity 502 through the passage 504; wherein the rocker shaft oil passage is communicated with the passage 504.

[0052] Specifically, please refer to Figure 2 and Figure 11 , the one-way valve assembly 500 is further provided with a first oil passage 505, one end of the first oil passage 505 is communicated with the rocker shaft oil passage, and the other end of the first oil passage 505 is communicated with the passage 504.

[0053] Specifically, please refer to Figure 4 , the valve body of the one-way valve assembly 500 is further provided with a second oil passage 506, one end of the second oil passage 506 is communicated with the inner bottom wall of the second cavity 501, and the other end of the second oil passage 506 is communicated with one end of the fifth oil passage; please refer to Figure 5 , the other end of the fifth oil passage is communicated with one end of the fourth oil passage 102, and the other end of the fourth oil passage 102 is communicated with the first cavity 101. So that the second cavity 501 is communicated with the first cavity 101 through the second oil passage 506, the fifth oil passage and the fourth oil passage 102.

[0054] Specifically, please refer to Figure 2 , the valve body of the one-way valve assembly 500 is further provided with a third oil passage 507, one end of the third oil passage 507 is communicated with the inner bottom wall of the second cavity 501, and the other end is communicated with the fourth cavity 503, so that the second cavity 501 is communicated with the third cavity 502 through the third oil passage 507, the fourth cavity 503 and the passage 504.

[0055] In this embodiment, the one-way valve assembly 500 includes a transmission member movably arranged in the hydraulic cavity; please refer to Figure 2The transmission member includes a top block 510, a shaft rod 520, a blocking member 530, and a first blocking elastic member 560. The top block 510 is arranged in the third cavity 502. The blocking member 530 and the first blocking elastic member 560 are arranged in the fourth cavity 503. The shaft rod 520 is movably arranged along the channel 504. One end of the shaft rod 520 is connected with the blocking member 530. The other end of the shaft rod 520 is abutted with one end of the top block 510. One end of the first blocking elastic member 560 is abutted with the other end of the top block 510. The other end of the first blocking elastic member 560 is connected with the inner wall of the fourth cavity 503.

[0056] In the first aspect, the first blocking elastic member 560, the top block 510, the shaft rod 520, the blocking member 530, and the channel 504 are coaxially arranged. Figure 2

[0057] Optionally, referring to Figure 2 The one-way valve assembly 500 further includes a screw plug 570. The screw plug 570 is threadedly and sealingly connected with the fourth cavity 503. One end of the screw plug 570 arranged in the fourth cavity 503 is provided with a limiting cavity. One end of the first blocking elastic member 560 is connected with the limiting cavity of the screw plug 570. The other end of the first blocking elastic member 560 is connected with the blocking member 530.

[0058] Optionally, the blocking member 530 can be a spherical blocking member.

[0059] Optionally, referring to Figure 2 The one-way valve assembly 500 further includes a valve seat 580. The valve seat 580 is arranged in the fourth cavity 503 and is close to the channel 504. The valve seat 580 is provided with an opening and a matching groove. The shaft rod 520 penetrates through the matching groove, the opening, and the channel 504.

[0060] It can be understood that the first blocking elastic member 560 is used to push the shaft rod 520 to move along the channel 504 towards the third cavity 502, so that the blocking member 530 is matched with the matching groove of the valve seat 580 and the channel 504 is closed. The valve seat 580 and the blocking member 530 arranged in this way can enhance the sealing effect of the channel 504.

[0061] In the first aspect, referring to Figure 2 The one-way valve assembly 500 further includes a second blocking elastic member 540. The second blocking elastic member 540 is arranged in the third cavity 502. The second blocking elastic member 540, the top block 510, the shaft rod 520, the blocking member 530, and the channel 504 are coaxially arranged. One end of the second blocking elastic member 540 is connected with the inner wall of the third cavity 502. The other end of the second blocking elastic member 540 is limitingly connected with the top block 510. The second blocking elastic member 540 is used to push the top block 510, so that the shaft rod 520 moves along the channel 504 towards the fourth cavity 503. The shaft rod 520 pushes away the blocking member 530 and opens the channel 504.

[0062] ​Optionally, the top block 510 is provided with a limiting cavity for limiting connection of the second blocking elastic member 540.

[0063] Optionally, the third cavity 502 is provided with a first gasket 550 for limiting connection of one end of the second blocking elastic member 540 and the other end of the second blocking elastic member 540 with the limiting cavity of the top block 510.

[0064] It can be understood that when the electromagnetic valve is opened, the oil in the rocker shaft oil passage enters the channel 504, and the top block 510 drives the shaft rod 520 to move along the channel 504 towards the third cavity 502 under the action of the oil, so that the blocking member 530 is closed under the action of the first blocking elastic member 560.

[0065] It should be noted that the specific steps of the above steps are as follows: the electromagnetic valve is opened, the oil in the rocker shaft oil passage enters the channel 504 through the first oil passage 505, the oil entering the channel 504 drives the top block 510 to move towards the left side, and the top block 510 drives the shaft rod 520 to move along the channel 504 towards the third cavity 502; at the same time, the first blocking elastic member 560 is reset, and the blocking member 530 is pushed by the first blocking elastic member 560 to block and close the channel 504.

[0066] Among them, the first cavity 101, the second cavity 501 and the fourth cavity 503 are filled with oil and form a high-pressure cavity, and the piston assembly 200 is extended from the first position to the second position under the action of the tappet assembly.

[0067] It can be understood that when the electromagnetic valve is closed, the top block 510 drives the shaft rod 520 to move along the channel 504 towards the fourth cavity 503, the blocking member 530 is opened under the action of the shaft rod 520, and under the action of the valve, the oil in the first cavity 101 returns to the channel 504 through the second cavity 501 and the fourth cavity 503.

[0068] It should be noted that the specific steps of the above steps are as follows: when the electromagnetic valve is closed, the second blocking elastic member 540 is reset and drives the top block 510 and the shaft rod 520 to move towards one side of the channel 504, and the blocking member 530 is opened under the action of the shaft rod 520; at the same time, the first cavity 101, the second cavity 501, the fourth cavity 503, the channel 504, the first oil passage 505 and the rocker shaft oil passage are communicated and form a low-pressure cavity.

[0069] Under the action of the valve, the piston assembly 200 is retracted from the second position to the first position; at the same time, the piston assembly 200 drives the oil in the first cavity 101 to return to the rocker shaft oil passage through the second cavity 501, the fourth cavity 503 and the channel 504, and at this time the piston assembly 200 remains in the first position.

[0070] At this time, the blocking member 530 presses the first blocking elastic member 560, so that the first blocking elastic member 560 is in a compressed state.

[0071] In an optional embodiment, the valve body of the one-way valve assembly 500 and the rocker arm body 100 can form the variable-lift rocker arm structure 010 by one-piece forming or separate forming and then fixing.

[0072] Optionally, referring to Figure 6 , the one-way valve assembly 500 can be transversely arranged on the rocker arm body 100; or, referring to Figure 1 , the one-way valve assembly 500 can also be longitudinally arranged on the rocker arm body 100.

[0073] In the embodiment, the auxiliary rocker arm structure includes a tappet assembly, the one-way valve assembly 500 is provided with a second cavity 501, the second cavity 501 is respectively communicated with the first cavity 101 and the hydraulic chamber; the tappet assembly is movably arranged in the second cavity 501, and the tappet assembly is in transmission connection with the second cam.

[0074] It can be understood that when the battery valve is opened, the one-way valve assembly 500 cuts off the oil path between the rocker arm shaft oil path and the hydraulic chamber, and the tappet assembly pushes the oil in the second cavity 501 into the first cavity 101 under the action of the second cam, so that the piston assembly 200 extends from the first position to the second position, and the piston assembly 200 is kept at the second position.

[0075] Wherein, when the intake valve is opened to full opening, the piston assembly 200 returns the oil to the second cavity under the action of the valve, so that the tappet assembly extends outwardly; when the valve starts to reset, the tappet assembly pushes the oil into the first cavity 101 under the action of the second cam, so that the piston assembly 200 is kept at the second position, and the valve is delayed to reset to realize the second valve lift.

[0076] It can be understood that when the solenoid valve is closed, the one-way valve assembly 500 connects the oil path between the rocker arm shaft oil path and the hydraulic chamber, and the oil in the first cavity 101 returns to the rocker arm shaft oil path through the hydraulic chamber under the action of the valve, so that the piston assembly 200 is retracted from the second position to the first position, and the piston assembly 200 is kept at the first position.

[0077] In an embodiment, referring to Figures 1-5 , the tappet assembly is a first tappet assembly 300, and the first tappet assembly 300 extends along the second cavity 501, so that the first tappet assembly 300 is in constant contact with the second cam.

[0078] Specifically, when the solenoid valve is opened, the first tappet assembly 300 pushes the oil in the second cavity 501 into the first cavity 101 under the action of the second cam, so that the piston assembly 200 extends from the first position to the second position.

[0079] In this embodiment, please refer to Figure 2 and Figure 4 The first tappet assembly 300 includes a first tappet 310 and a first elastic member 320, the first tappet 310 is arranged in the second cavity 501, the first tappet 310 is provided with a first limiting cavity at one end close to the second cavity 501, the first elastic member 320 is arranged in the first limiting cavity, one end of the first elastic member 320 is connected with the inner wall of the first limiting cavity, and the other end of the first elastic member 320 is connected with the inner wall of the second cavity 501; the end of the first tappet 310 away from the second cavity 501 is provided with a first roller 330.

[0080] The first roller 330 is rotatably connected with the first tappet 310 through a shaft pin.

[0081] Optionally, the first elastic member 320 is a spring.

[0082] It should be noted that the first tappet assembly 300 uses a structure that is in constant contact with the second cam, and because the mechanism inertia of the variable lift rocker arm structure 010 is small, the spring force required to keep the first tappet assembly 300 in contact with the second cam through the first elastic member 320 is small, and the friction loss with the second cam is small; at the same time, the present application does not need to switch the cam, so the first tappet 310 will not have the impact or eccentric wear influence when switching.

[0083] The working process of the variable lift rocker arm structure 010 provided with the first tappet assembly 300 in the embodiment is as follows: the first tappet 310 is in the ejecting state under the action of the first elastic member 320, and the first tappet 310 is in constant contact with the second cam.

[0084] Firstly, the electromagnetic valve is opened, the control oil enters the channel 504, the top block 510 drives the shaft rod 520 to move along the channel 504 towards the third cavity 502 under the action of the oil, and the blocking member 530 is closed under the action of the first blocking elastic member 560.

[0085] Under the action of the second cam, the second cam drives the first tappet 310 in the extending state to move along the second cavity 501 and pushes the oil in the second cavity 501 into the first cavity 101, and the oil entering the first cavity 101 drives the piston assembly 200 to extend from the first position to the second position.

[0086] Further, under the rotating action of the first cam, the first cam drives the second roller 120 to make the variable lift rocker arm structure 010 swing, so that the piston assembly 200 drives the valve to switch from the first valve lift to the second valve lift.

[0087] Secondly, the electromagnetic valve is closed, the sealing member 530 is opened under the action of the shaft rod 520, the first cavity 101, the second cavity 501, the fourth cavity 503, the channel 504, the first oil channel 505 and the rocker shaft oil passage are communicated and a low pressure cavity is formed.

[0088] Further, under the action of the valve, the oil in the first cavity 101 returns to the rocker shaft oil passage through the hydraulic cavity, so that the piston assembly 200 is retracted from the second position to the first position.

[0089] Further, under the action of the rotation of the first cam, the first cam pushes the second roller 120, so that the variable lift rocker structure 010 swings, and the piston assembly 200 pushes the valve to generate a first valve lift.

[0090] In an embodiment, please refer to Figures 6-10 The tappet assembly is a second tappet assembly 400, the second tappet assembly 400 is retracted along the second cavity 501, and the second tappet assembly 400 is in a constant non-contact state with the second cam.

[0091] Specifically, the electromagnetic valve is opened, the rocker shaft oil passage fills the second cavity 501 with oil through the hydraulic cavity, the second tappet assembly 400 extends along the second cavity 501 under the action of the oil and contacts the second cam, and the second tappet assembly 400 pushes the oil in the second cavity 501 into the first cavity 101 under the action of the second cam, so that the piston assembly 200 extends from the first position to the second position.

[0092] In this embodiment, please refer to Figure 10 The second tappet assembly 400 includes a second tappet 410, a second elastic member 420, a connecting shaft 430 and a limiting member 440, the second tappet 410 is arranged in the second cavity 501, the second tappet 410 is provided with a second limiting cavity at one end close to the second cavity 501, and the limiting member 440 is limitedly connected in the second limiting cavity. The connecting shaft 430 penetrates the rocker body 100, the limiting member 440 and the second limiting cavity, one end of the connecting shaft 430 is provided with a limiting portion 431 located in the second limiting cavity, the second elastic member 420 is arranged in the second limiting cavity, one end of the second elastic member 420 is connected with the limiting member 440, and the other end is connected with the limiting portion 431.

[0093] Further, one end of the second tappet 410 away from the second cavity 501 is provided with a connecting portion 450.

[0094] Optionally, please refer to Figure 7 The connecting portion 450 is provided with a flat bottom contact surface in contact with the second cam; or, please refer to Figures 8-10 The connecting portion 450 is provided with an arc-shaped contact surface in contact with the second cam.

[0095] It should be noted that the second tappet assembly 400 uses a structure that is not in contact with the second cam most of the time, so that the second tappet 410 of the second tappet assembly 400 does not work in contact with the second cam, that is, no friction loss is generated; at the same time, the present application does not need to switch the cam relative to the prior art, so that the second tappet 410 will not have the impact or eccentric wear influence when switching.

[0096] The working process of the variable lift rocker arm structure 010 provided with the second tappet assembly 400 in the embodiment is as follows: the second tappet 410 is in a retracted state under the action of the second elastic member 420, and the second tappet 410 is not in contact with the second cam.

[0097] First: the electromagnetic valve is opened, the oil in the rocker shaft oil passage enters the channel 504, the top block 510 drives the shaft rod 520 to move along the channel 504 towards the third cavity 502 under the action of the oil, the rocker shaft oil passage supplies oil to the second cavity 501 through the channel 504 and the fourth cavity 503, and the blocking member 530 closes the channel 504 under the action of the first blocking elastic member 560.

[0098] At this time, under the action of the oil entering the second cavity 501, the second tappet 410 in the retracted state extends along the connecting shaft 430, and at this time the second tappet 410 is in a contactable state with the second cam. Under the action of the second cam, the second cam pushes the extended second tappet 410 to move along the second cavity 501 and pushes the oil in the second cavity 501 into the first cavity 101, and the oil in the first cavity 101 pushes the piston assembly 200 to extend from the first position to the second position. Since the first cavity 101, the second cavity 501 and the fourth cavity 503 are full of oil and the channel 504 is closed, the piston assembly 200 remains in the second position.

[0099] Further, under the action of the rotation of the first cam, the first cam pushes the second roller 120 to make the variable lift rocker arm structure 010 swing, so that the piston assembly 200 pushes the valve to switch from the first valve lift to the second valve lift.

[0100] Second: the electromagnetic valve is closed, and under the action of the valve, the blocking member 530 opens the channel 504 under the action of the shaft rod 520; at the same time, the first cavity 101, the second cavity 501, the fourth cavity 503, the channel 504, the first oil passage 505 and the rocker shaft oil passage are communicated and form a low-pressure cavity.

[0101] Further, the oil in the first cavity 101 returns to the rocker shaft oil passage through the hydraulic cavity to make the piston assembly 200 retract from the second position to the first position, and there is no oil in the hydraulic cavity and the second cavity 501, and the piston assembly 200 remains in the first position.

[0102] At this time, the hydraulic cavity and the second cavity 501 are free of oil, and the second tappet 410 is restored to the retracted state of not contacting the second cam under the action of the second elastic member 420.

[0103] Further, under the action of the rotation of the first cam, the first cam pushes the second roller 120 to make the variable-lift rocker arm structure 010 swing to make the piston assembly 200 push the valve to generate the first valve lift.

[0104] In summary, the variable-lift rocker arm structure 010 and the variable valve phase and lift rocker arm assembly structure provided by the embodiments of the present application can switch the extended position of the piston assembly 200, i.e., the first position or the second position, through the oil, and further switch the first valve lift and the second valve lift generated by the valve, by setting the variable-lift rocker arm structure 010 including the rocker arm body 100 and the auxiliary rocker arm structure, under the action of the auxiliary rocker arm structure. On the one hand, compared with the existing double-roller or double-tappet structure, the present application can switch the first valve lift and the second valve lift generated by the valve by setting the auxiliary rocker arm structure, without switching the cam or the position of the cam, which can reduce the eccentric wear caused by the switching of the double-roller or double-tappet in the prior art to a certain extent. On the other hand, the components are reduced and the mass is reduced, so that the moment of inertia of the variable-lift rocker arm structure 010 as a whole is small. On the other hand, compared with the variable-height valve bridge in the prior art, the present application integrates the oil passage in the auxiliary rocker arm structure, the control oil passage is short and responds quickly, and can timely adapt to the changes of the automobile driving conditions.

[0105] Further, the tappet assembly is set as the first tappet assembly 300, the first tappet assembly 300 is in constant contact with the second cam, the spring force required to keep the first tappet assembly 300 in contact with the second cam through the first elastic member 320 is small due to the small mechanism inertia of the variable-lift rocker arm structure 010, and the friction loss with the second cam is small. At the same time, compared with the prior art, the present application does not need to switch the cam, so there is no collision when switching.

[0106] Further, the tappet assembly is set as the second tappet assembly 400, the second tappet assembly 400 is in constant non-contact with the second cam, so that the second tappet 410 of the second tappet assembly 400 does not contact the second cam when not working, and thus the second tappet 410 does not generate friction loss.

[0107] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which shall be covered within the protection scope of the present application.

Claims

1. A variable lift rocker arm structure, characterized in that: include: A rocker arm body (100), the rocker arm body (100) being movably disposed on a rocker arm shaft (110), a rocker arm shaft oil circuit being disposed in the rocker arm shaft (110), the rocker arm body (100) being provided with a first cavity (101), a piston assembly (200) being movably disposed in the first cavity (101) and being connected to a valve transmission, the piston assembly (200) having a first position and a second position; An auxiliary rocker arm structure, the auxiliary rocker arm structure is fixed to the rocker arm shaft (110), the auxiliary rocker arm structure comprises a one-way valve assembly (500) and a tappet assembly, the one-way valve assembly (500) is provided with a hydraulic chamber and a second chamber (501), the hydraulic chamber is communicated with the rocker arm shaft oil circuit, the second chamber (501) is communicated with the first chamber (101) and the hydraulic chamber respectively, and the tappet assembly is movably arranged in the second chamber (501); The solenoid valve is opened, and the piston assembly (200) extends from the first position to the second position; The solenoid valve is closed, and the piston assembly (200) is retracted from the second position to the first position.

2. The variable lift rocker arm structure according to claim 1, characterized in that: The one-way valve assembly (500) comprises a transmission member movably arranged in the hydraulic cavity; When the solenoid valve is opened, the oil in the rocker shaft oil circuit enters the hydraulic chamber, and the transmission member cuts off the oil circuit between the rocker shaft oil circuit and the hydraulic chamber; The solenoid valve is closed, and under the action of the valve, the oil in the first cavity (101) returns to the rocker shaft oil circuit through the hydraulic cavity, and the transmission member connects the oil circuit between the rocker shaft oil circuit and the hydraulic cavity.

3. The variable lift rocker arm structure according to claim 2, characterized in that: The hydraulic chamber comprises a third chamber (502), a fourth chamber (503) and a channel (504); the second chamber (501) is in communication with the fourth chamber (503); the fourth chamber (503) is in communication with the third chamber (502) via the channel (504); the rocker shaft oil circuit is in communication with the channel (504); The transmission member includes a top block (510), a shaft (520), a blocking member (530) and a first blocking elastic member (560), wherein the top block (510) is arranged in the third cavity (502), the blocking member (530) and the first blocking elastic member (560) are arranged in the fourth cavity (503), the shaft (520) is movably arranged along the channel (504), one end of the shaft (520) is connected to the blocking member (530), and the other end abuts against one end of the top block (510), one end of the first blocking elastic member (560) abuts against the other end of the top block (510), and the other end of the first blocking elastic member (560) is connected to the inner wall of the fourth cavity (503); The solenoid valve is opened, and the oil in the rocker shaft oil circuit enters the channel (504). Under the action of the oil, the top block (510) drives the shaft (520) to move along the channel (504) toward the third cavity (502), so that the blocking member (530) closes the channel (504) under the action of the first blocking elastic member (560); The solenoid valve is closed, and the top block (510) drives the shaft (520) to move along the channel (504) toward the fourth cavity (503). The blocking member (530) opens the channel (504) under the action of the shaft (520). Under the action of the valve, the oil in the first cavity (101) returns to the channel (504) through the second cavity (501) and the fourth cavity (503).

4. The variable lift rocker arm structure according to claim 1, characterized in that: The tappet assembly is used for transmission connection with the second cam; The battery valve is opened, the one-way valve assembly (500) cuts off the oil circuit between the rocker shaft oil circuit and the hydraulic chamber, and the tappet assembly pushes the oil in the second chamber (501) into the first chamber (101) under the action of the second cam, so that the piston assembly (200) extends from the first position to the second position, and the piston assembly (200) remains in the second position; The solenoid valve is closed, and the one-way valve assembly (500) is connected to the oil circuit between the rocker shaft oil circuit and the hydraulic chamber. Under the action of the valve, the oil in the first chamber (101) returns to the rocker shaft oil circuit through the hydraulic chamber, so that the piston assembly (200) is retracted from the second position to the first position, and the piston assembly (200) remains in the first position.

5. The variable lift rocker arm structure according to claim 4, characterized in that: The tappet assembly is a first tappet assembly (300), and the first tappet assembly (300) extends along the second cavity (501), so that the first tappet assembly (300) and the second cam are in a constant contact state; The solenoid valve is opened, and the first tappet assembly (300) pushes the oil in the second cavity (501) into the first cavity (101) under the action of the second cam, so that the piston assembly (200) extends from the first position to the second position.

6. The variable lift rocker arm structure according to claim 5, characterized in that: The first tappet assembly (300) includes a first tappet (310) and a first elastic member (320), wherein the first tappet (310) is disposed in the second cavity (501), a first limiting cavity is provided at one end of the first tappet (310) close to the second cavity (501), the first elastic member (320) is limitedly disposed in the first limiting cavity, one end of the first elastic member (320) is connected to the inner wall of the first limiting cavity, and the other end of the first elastic member (320) is connected to the inner wall of the second cavity (501); A first roller (330) is provided at one end of the first tappet (310) away from the second cavity (501).

7. The variable lift rocker arm structure according to claim 4, characterized in that: The tappet assembly is a second tappet assembly (400), the second tappet assembly (400) is retracted along the second cavity (501), and the second tappet assembly (400) and the second cam are in a constant non-contact state; The solenoid valve is opened, and the rocker shaft oil circuit flows into the second cavity (501) through the hydraulic cavity. Under the action of the oil, the second tappet assembly (400) extends along the second cavity (501) and contacts the second cam. Under the action of the second cam, the second tappet assembly (400) pushes the oil in the second cavity (501) into the first cavity (101), so that the piston assembly (200) extends from the first position to the second position.

8. The variable lift rocker arm structure according to claim 7, characterized in that: The second tappet assembly (400) comprises a second tappet (410), a second elastic member (420), a connecting shaft (430) and a limiting member (440); the second tappet (410) is arranged in the second cavity (501); a second limiting cavity is provided at one end of the second tappet (410) close to the second cavity (501); and the limiting member (440) is connected to the second limiting cavity in a limiting manner; The connecting shaft (430) passes through the rocker arm body (100), the limiting member (440) and the second limiting cavity, and one end of the connecting shaft (430) is provided with a limiting portion (431) located in the second limiting cavity; the second elastic member (420) is arranged in the second limiting cavity, and one end of the second elastic member (420) is connected to the limiting member (440), and the other end is connected to the limiting portion (431); A connecting portion (450) is provided at one end of the second tappet (410) away from the second cavity (501); the connecting portion (450) is provided with a flat bottom contact surface; or the connecting portion (450) is provided with an arc-shaped contact surface.

9. The variable lift rocker arm structure according to claim 1, characterized in that: The variable lift rocker arm structure (010) further includes a second roller (120), wherein the second roller (120) is used for being in transmission connection with the first cam, and under the action of the first cam, the second roller (120) drives the variable lift rocker arm structure (010) to swing.

10. A rocker arm assembly structure with variable valve phase and lift, characterized in that: It comprises the variable lift rocker arm structure (010) according to any one of claims 1 to 9.

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