阅读说明：本技术 可改变气门运动的气门桥 (Valve bridge capable of changing valve motion ) 是由 张芳 万虎 吴囿霖 李庆华 于 2021-08-30 设计创作，主要内容包括：本发明涉及一种可改变气门运动的气门桥,该气门桥,包括气门桥本体,气门桥本体内设有活塞腔和柱塞腔,活塞腔内安装有与摇臂连接的活塞；柱塞腔内安装有柱塞,柱塞一端通过柱塞弹簧安装在柱塞腔内,另一端与活塞上的环形油槽配合,环形油槽通过活塞内的油路与外部油路连通；通过在活塞内部设置油路,油路的通断可以控制柱塞位置：当环形油槽内没有机油时,柱塞在柱塞弹簧的作用下,插入环形油槽内,活塞无法上下移动；当环形油槽内充满机油时,在机油压力的作用下柱塞推开柱塞弹簧,此时柱塞完全退出环形油槽,活塞在摇臂作用下移动至活塞腔底部。通过柱塞与活塞的配合,实现活塞与气门桥的连接或非连接状态的切换,从而实现气门运动的改变。(The invention relates to a valve bridge capable of changing valve motion, which comprises a valve bridge body, wherein a piston cavity and a plunger cavity are arranged in the valve bridge body, and a piston connected with a rocker arm is arranged in the piston cavity; a plunger is arranged in the plunger cavity, one end of the plunger is arranged in the plunger cavity through a plunger spring, the other end of the plunger is matched with an annular oil groove on the piston, and the annular oil groove is communicated with an external oil path through an oil path in the piston; through set up the oil circuit in piston inside, the plunger position can be controlled to the break-make of oil circuit: when no engine oil exists in the annular oil groove, the plunger is inserted into the annular oil groove under the action of the plunger spring, and the piston cannot move up and down; when the annular oil groove is filled with engine oil, the plunger pushes the plunger spring open under the action of the engine oil pressure, the plunger completely exits the annular oil groove at the moment, and the piston moves to the bottom of the piston cavity under the action of the rocker arm. Through the cooperation of plunger and piston, realize the switching of the connected or disconnected state of piston and valve bridge to realize the change of valve motion.)

1. The utility model provides a can change valve motion's valve bridge, includes valve bridge body, its characterized in that: a piston cavity and a plunger cavity are arranged in the valve bridge body, and a piston connected with the rocker arm is arranged in the piston cavity; a plunger is arranged in the plunger cavity, one end of the plunger is arranged in the plunger cavity through a plunger spring, the other end of the plunger is matched with an annular oil groove on the piston, and the annular oil groove is communicated with an external oil path through an oil path in the piston; when oil is filled in the annular oil groove, the plunger retreats from the annular oil groove under the action of oil pressure and is gradually separated from the piston, and the plunger spring is compressed; when oil is discharged from the annular oil groove, the plunger is gradually inserted into the annular oil groove under the action of the plunger spring, and the plunger blocks the piston.

2. The valve bridge that can change the valve motion according to claim 1, characterized in that: the piston cavity is vertically arranged, the plunger cavities are horizontally and symmetrically arranged on two sides of the piston cavity, and plungers are arranged in the plunger cavities on two sides.

3. The valve bridge that can change the valve motion according to claim 1, characterized in that: the annular oil groove comprises a first annular oil groove and a second annular oil groove, the second annular oil groove is arranged in the first annular oil groove, and the first annular oil groove is matched with the outer cylindrical surface of the plunger to play a guiding role; the width of the second annular oil groove is smaller than the diameter of the end face of the plunger, so that the plunger can respond quickly after oil is in contact with the end face of the plunger when oil is filled.

4. The valve bridge that can change the valve motion according to claim 3, characterized in that: the plunger is in planar contact with the first annular oil groove.

5. The valve bridge that can change the valve motion according to claim 1, characterized in that: and the notch of the annular oil groove is rounded.

6. The valve bridge that can change the valve motion according to claim 1, characterized in that: the upper end of the piston is connected with the rocker arm, and a piston spring is arranged between the lower end of the piston and the piston cavity.

7. The valve bridge that can change the valve motion according to claim 6, characterized in that: the piston spring comprises a first piston spring and a second piston spring, the first piston spring is arranged between the outer circular wall of the piston and the bottom of the piston cavity, and the second piston spring is arranged between the inner circular wall of the piston and the bottom of the piston cavity.

8. The valve bridge that can change the valve motion according to claim 1, characterized in that: and an oil drainage hole is formed in the bottom of the piston cavity and communicated with an oil way in the piston.

9. The valve bridge that can change the valve motion according to claim 1, characterized in that: and a positioning pin for limiting the axial rotation of the plunger is arranged between the plunger and the plunger cavity.

10. The valve bridge that can change the valve motion according to claim 1, characterized in that: and a push rod which is contacted with the other rocker arm is arranged on the valve bridge body through a push rod spring.

Technical Field

The invention relates to the technical field of valve actuating mechanisms of vehicle engines, in particular to a valve bridge capable of changing valve motion.

Background

The variable valve motion technology can change the valve lift when the engine runs, and realize cylinder deactivation, so that the engine has good fuel economy and emission in a low-speed area and under a small load.

The engine braking means that an engine is changed into an air compressor, and the basic idea is that when the engine does not supply oil, an exhaust valve is opened quickly before a compression top dead center, so that gas with compression energy is released. If the braking power is to be increased, two top dead centers are required in one working cycle of the four-stroke engine, and the braking power can be increased by pressing and retracting to release energy gas through the two top dead centers. Because of the normal exhaust stroke of the four-stroke cycle, valve motion must be lost in this state to provide a hardware environment for high power braking during engine braking conditions.

In recent years, various engine valve control technologies have been developed by various automobile enterprises and parts suppliers at home and abroad in order to improve fuel economy and improve in-cylinder combustion under different working conditions to meet increasingly stringent emission regulations. Diesel engines are also increasingly using cylinder deactivation technology, while high power braking technology under braking conditions is achieved by valve motion control.

The driving methods for changing the valve motion include an electromagnetic type and a hydraulic type. The mechanism is arranged in the following way: arranged on the cam, and is completed by the switching of the cam; a rocker arm disposed on the rocker arm, the rocker arm being switchable by a mechanism to transmit motion from the hard link to the non-transmitting cam drive; arranged on the valve bridge, a mechanism ensures that the valve bridge is switched as required to transmit the cam drive motion.

Disclosure of Invention

In order to solve the problems, the invention provides the valve bridge capable of changing the valve motion, which has a reasonable structure and high reliability.

The technical scheme adopted by the invention is as follows: the utility model provides a can change valve motion's valve bridge, includes valve bridge body, its characterized in that: a piston cavity and a plunger cavity are arranged in the valve bridge body, and a piston connected with the rocker arm is arranged in the piston cavity; a plunger is arranged in the plunger cavity, one end of the plunger is arranged in the plunger cavity through a plunger spring, the other end of the plunger is matched with an annular oil groove on the piston, and the annular oil groove is communicated with an external oil path through an oil path in the piston; when oil is filled in the annular oil groove, the plunger retreats from the annular oil groove under the action of oil pressure and is gradually separated from the piston, and the plunger spring is compressed; when oil is discharged from the annular oil groove, the plunger is gradually inserted into the annular oil groove under the action of the plunger spring, and the plunger blocks the piston. Through set up the oil circuit in piston inside, the plunger position can be controlled to the break-make of oil circuit: when no engine oil exists in the annular oil groove on one side of the plunger, the plunger is inserted into the annular oil groove of the piston under the action of the plunger spring on the other side, and the piston cannot move up and down; when the annular oil groove on one side of the plunger is filled with engine oil, the plunger pushes the plunger spring at the other end away under the action of the engine oil pressure, the plunger completely exits from the annular oil groove, and the piston can move downwards under the action of the rocker arm until the bottom of the piston contacts the bottom of the piston cavity.

Preferably, the piston cavity is vertically arranged, the plunger cavities are horizontally and symmetrically arranged on two sides of the piston cavity, plungers are arranged in the plunger cavities on two sides, and the connection or disconnection state of the piston and the valve bridge is switched through the cooperation of the plungers and the piston, so that the change of valve motion is realized.

Preferably, the annular oil groove comprises a first annular oil groove and a second annular oil groove, the second annular oil groove is arranged in the first annular oil groove, and the first annular oil groove is matched with the outer cylindrical surface of the plunger to play a guiding role; the width of the second annular oil groove is smaller than the diameter of the end face of the plunger, so that the plunger can respond quickly after oil is in contact with the end face of the plunger when oil is filled.

Furthermore, the plunger is in planar contact with the first annular oil groove, and the contact area of the plunger and the piston in the unchanged valve motion state is increased, so that the plunger is more stable when moving in the first annular oil groove.

Preferably, the notch of the annular oil groove is rounded, so that the phenomenon of clamping stagnation of the piston during movement of the piston under certain impact (certain metal flow can be generated by impact) generated by the piston and the plunger in a transitional movement state is avoided.

Preferably, the upper end of the piston is connected with the rocker arm, and a piston spring is arranged between the lower end of the piston and the piston cavity.

Preferably, the piston spring comprises a first piston spring disposed between the outer piston circular wall and the bottom of the piston chamber and a second piston spring disposed between the inner piston circular wall and the bottom of the piston chamber. The double springs are adopted, so that the piston is always in contact with the rocker arm when the valve motion state is changed, and the impact load of the piston in an uncontrollable motion state cannot occur.

Preferably, the bottom of the piston cavity is provided with an oil drainage hole, and the oil drainage hole is communicated with an oil way in the piston and used for discharging engine oil in the piston to prevent the piston from slowing down or blocking.

Preferably, a positioning pin for limiting axial rotation of the plunger is arranged between the plunger and the plunger cavity, so that the bad contact between the piston and the plunger caused by relative rotation of the plunger and the plunger cavity is prevented from influencing normal functions.

Preferably, a push rod which is contacted with the other rocker arm is arranged on the valve bridge body through a push rod spring and can be used for realizing engine braking.

The beneficial effects obtained by the invention are as follows: according to the invention, the oil way is arranged in the piston, and the position of the plunger can be controlled by the on-off of the oil way: when no engine oil exists in the annular oil groove on one side of the plunger, the plunger is inserted into the annular oil groove of the piston under the action of the plunger spring on the other side, and the piston cannot move up and down; when the annular oil groove on one side of the plunger is filled with engine oil, the plunger pushes the plunger spring at the other end away under the action of the engine oil pressure, the plunger completely exits from the annular oil groove, and the piston can move downwards under the action of the rocker arm until the bottom of the piston contacts the bottom of the piston cavity. Through the cooperation of plunger and piston, realize the switching of being connected or dividing the connection state of piston and valve bridge to realize the change of valve motion.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the plunger seizing the piston;

FIG. 3 is a schematic diagram of the plunger exiting the annular oil groove;

FIG. 4 is a schematic view of the piston;

FIG. 5 is a schematic view of the plunger;

reference numerals: 1. a valve bridge body; 11. a piston cavity; 12. a plunger cavity; 13. an oil drainage hole; 2. a piston; 21. a piston oil path; 22. (ii) a An annular oil groove; 221. a first annular oil groove; 222. a second annular oil groove; 3. a plunger; 31. a contact surface; 4. a second piston spring; 5. a first piston spring; 6. a plunger spring; 7. a push rod; 8. a clamp spring; 9. positioning pins; 10. a push rod spring.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1-5, the valve bridge capable of changing the valve motion of the present invention comprises a valve bridge body 1, a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11.

In one embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. Piston cavity 11 vertical setting, plunger cavity 12 horizontal symmetry set up in piston cavity 11 both sides, all are equipped with plunger 3 in the plunger cavity 12 of both sides, through plunger 3 and piston 2's cooperation, realize the switching of being connected or non-connected state of piston 2 and valve bridge body 1 to realize the change of valve motion.

In one embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. Referring to fig. 4, in the present embodiment, the annular oil groove 22 adopts a stepped ring groove structure, and includes a first annular oil groove 221 and a second annular oil groove 222, the second annular oil groove 222 is disposed in the first annular oil groove 221, and the first annular oil groove 221 cooperates with the contact surface 31 of the outer cylindrical surface of the plunger 3 to perform a guiding function; the width of the second annular oil groove 222 is smaller than the diameter of the end face of the plunger 3, so that the plunger 3 can respond quickly after oil contacts with the end face of the plunger 3 during oil filling.

In the embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. Referring to fig. 5, in this embodiment, the contact surface 31 of the plunger 3 and the first annular oil groove 221 is in planar contact, and the contact area with the piston 2 in the unchanged valve movement state is increased, so that the plunger 3 moves more smoothly in the first annular oil groove 221.

In one embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. In this embodiment, the notch of the annular oil groove 22 is rounded to ensure that no jamming phenomenon occurs during the piston movement when the piston 2 and the plunger 3 are in a transition movement state and also generate a certain impact (the impact can generate a certain metal flow).

In one embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. In this embodiment, the upper end of the piston 2 is connected to the rocker arm, and a piston spring is provided between the lower end and the piston chamber 11.

In one embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. In this embodiment, the piston springs include a first piston spring 5 and a second piston spring 4, the first piston spring 5 is disposed between the outer circumferential wall of the piston 2 and the bottom of the piston chamber 11, and the second piston spring 4 is disposed between the inner circumferential wall of the piston 2 and the bottom of the piston chamber 11. And the double springs are adopted, so that the piston 2 is always contacted with the rocker arm under the condition of changing the motion state of the valve, and the impact load of the piston 2 under the uncontrollable motion state can not occur.

In one embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. In this embodiment, the bottom of the piston cavity 11 is provided with an oil drainage hole 13, and the oil drainage hole 13 is communicated with a piston oil path 21 in the piston and used for discharging engine oil in the piston 2 and preventing the piston 2 from slowing down or clamping stagnation.

In one embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. In this embodiment, a positioning pin 9 for limiting axial rotation of the plunger 3 is arranged between the plunger 3 and the plunger cavity 12, so that poor contact between the piston 2 and the plunger 3 caused by relative rotation of the plunger 3 and the plunger cavity 12 is prevented, and normal functions are prevented from being affected.

In one embodiment, the valve bridge capable of changing the valve motion comprises a valve bridge body 1, wherein a piston cavity 11 and a plunger cavity 12 are arranged in the valve bridge body 1, and a piston 2 connected with a rocker arm is arranged in the piston cavity 11; a plunger 3 is arranged in the plunger cavity 12, one end of the plunger 3 is arranged in the plunger cavity 12 through a plunger spring 6, the other end of the plunger 3 is matched with an annular oil groove 22 on the piston 2, and the annular oil groove 22 is communicated with an external oil path through a piston oil path 21 in the piston 2; when oil is filled in the annular oil groove 22, the plunger 3 is withdrawn from the annular oil groove 22 under the action of oil pressure and gradually separated from the piston 2, and the plunger spring 6 is compressed; when oil is discharged from the annular oil groove 22, the plunger 3 is gradually inserted into the annular oil groove 22 under the action of the plunger spring 6, and the plunger 3 clamps the piston 2. By arranging the piston oil path 21 in the piston 2, the position of the plunger 3 can be controlled by controlling the on-off of the piston oil path 21: when no oil exists in the annular oil groove 22 on one side of the plunger 3, the plunger 3 is inserted into the annular oil groove 22 of the piston 2 under the action of the plunger spring 6 on the other side, and the piston 2 cannot move up and down; when the annular oil groove 22 on one side of the plunger 3 is filled with engine oil, the plunger 3 pushes away the plunger spring 6 on the other end under the action of the engine oil pressure, at this time, the plunger 3 completely exits the annular oil groove 22, and the piston 3 can move downwards under the action of the rocker arm until the bottom of the piston 2 contacts the bottom of the piston cavity 11. In this embodiment, the valve bridge body 1 is provided with a push rod 7 contacting another rocker arm through a push rod spring 10, which can be used for realizing engine braking.

The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Here, it should be noted that the description of the above technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the present invention is limited only by the scope of the claims.

The shapes, sizes, ratios, angles, and numbers disclosed to describe aspects of the specification and claims are examples only, and thus, the specification and claims are not limited to the details shown. In the following description, when a detailed description of related known functions or configurations is determined to unnecessarily obscure the focus of the present specification and claims, the detailed description will be omitted.

Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be in the singular but may also be in the plural.

It should be noted that although the terms "first," "second," "top," "bottom," "side," "other," "end," "other end," and the like may be used and used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one element or section from another element or section. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with the top and bottom elements being interchangeable or switchable with one another, where appropriate, without departing from the scope of the present description; the components at one end and the other end may be of the same or different properties to each other.

In describing positional relationships, for example, when positional sequences are described as being "on.. above", "over.. below", "below", and "next", unless such words or terms are used as "exactly" or "directly", they may include cases where there is no contact or contact therebetween. If a first element is referred to as being "on" a second element, that does not mean that the first element must be above the second element in the figures. The upper and lower portions of the member will change depending on the angle of view and the change in orientation. Thus, in the drawings or in actual construction, if a first element is referred to as being "on" a second element, it can be said that the first element is "under" the second element and the first element is "over" the second element. In describing temporal relationships, unless "exactly" or "directly" is used, the description of "after", "subsequently", and "before" may include instances where there is no discontinuity between steps. The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.