Variable valve actuation mechanism for engine and engine

Abstract

A variable valve actuation mechanism for an engine; a rocker arm mechanism of the variable valve actuation mechanism is a combined rocker arm mechanism and comprises a valve-side rocker arm and at least one cam-side rocker arm; on a camshaft, each cam-side rocker arm is provided with a cam; one end of the valve-side rocker arm is connected to a valve mechanism, and the other end is provided with a beam structure, the beam structure being located above the cam-side rocker arms and having a certain clearance with the cam-side rocker arms; sliding block and return springs are provided on the cam-side rocker arms; when an oil passage controlled by a solenoid valve is in an off or on state, under the drive of the force of the return springs and a lubrication oil, the sliding block have a first position and a second position, respectively; and when at the first position and the second position, the sliding block enable the cam-side rocker arms and the valve-side rocker arm to form a transmission chain and a disconnected transmission chain, respectively, thus enabling the combined rocker arm mechanism to be able to selectively transmit the driving lift of a cam that corresponds to one of the cam-side rocker arms to the valve-side rocker arm, achieving a variable valve. Also disclosed is an engine which comprises a variable valve actuation mechanism

What is claimed is: 
     
         1 . A variable valve actuation mechanism for an engine comprising: a rocker arm mechanism, a camshaft, a rock shaft and a solenoid valve;
 wherein the rocker arm mechanism which is a combined rocker arm mechanism, includes one valve-side rocker arm and at least one cam-side rocker arm; both the valve-side rocker arm and the cam-side rocker arm are provided with rocker arm shaft mounting holes, the valve-side rocker arm and the cam-side rocker arm are installed side by side on the rocker arm shaft, and can be rotated on the rocker arm shaft; one end of the valve-side rocker arm which is close to the camshaft is provided with a beam structure, and the beam structure being located above the cam-side rocker arms and having a certain clearance with the cam-side rocker arms; the major structure of the cam-side rocker arm are all located on the side which is close to the camshaft, the camshaft is provided with a cam corresponding to each of the cam-side rocker arms, and the contours of each of the cams are different, and each of the cam-side rocker arm is driven up and down by the corresponding cam; sliding block and return springs are provided on the cam-side rocker arms, and the sliding block can move in the gap between the beam structure and the cam-side rocker arm; the rocker arm shaft is provided with a rocker arm shaft oil passage, the sliding block can be driven by the lubrication oil with pressure provided by the rocker arm shaft oil passage; the solenoid valve is provided on the rocker arm shaft oil passage, the rocker arm shaft oil passage is controlled by the solenoid valve in an off or on state.   
     
     
         2 . The variable valve actuation mechanism for an engine according to  claim 1 , wherein the number of the cam-side rocker arm is two, one of which is the first cam-side rocker arm, and the other is the second cam-side rocker arm, when the oil passage controlled by the solenoid valve is in an off state, the sliding block of the first cam-side rocker arm and the second cam-side rocker arm have a first position under the drive of the preload of the return springs; when the oil passage controlled by the solenoid valve is in an on state, the sliding block of the first cam-side rocker arm and the second cam-side rocker arm have a second position under the drive of the lubrication oil, wherein:
 the first position of the sliding block of the first cam-side rocker arm is located between the beam structure of the valve-side rocker arm and the first cam-side rocker arm, at this position, the sliding block eliminates the gap between the beam structure of the first cam-side rocker arm and the valve-side rocker arm, and enable the first cam-side rocker arm and the valve-side rocker arm to form a transmission chain, and enable the first cam-side rocker arms to be able to transmit the driving lift of the corresponding cam to the valve-side rocker arm; the first position of the sliding block of the second cam-side rocker arm is located below the beam structure of the valve-side rocker arm, and at a position staggered from the beam structure, at this position, the sliding block cannot eliminate the gap between the second cam-side rocker arm and the beam structure of the valve-side rocker arm, and the second cam-side rocker arm and the valve-side rocker arm cannot form a transmission chain;   the first position of the sliding block of the first cam-side rocker arm is located below the beam structure of the valve-side rocker arm, and at a position staggered from the beam structure, at this position, the sliding block cannot eliminate the gap between the first cam-side rocker arm and the beam structure of the valve-side rocker arm, and the first cam-side rocker arm and the valve-side rocker arm cannot form a transmission chain; the second position of the sliding block of the second cam-side rocker arm is located between the beam structure of the valve-side rocker arm and the second cam-side rocker arm, at this position, the sliding block eliminates the gap between the second cam-side rocker arm and the beam structure of the valve-side rocker arm, and enable the second cam-side rocker arm and the valve-side rocker arm to form a transmission chain, and enable the second cam-side rocker arm to be able to transmit the driving lift of the corresponding cam to the valve-side rocker arm; thus enabling the combined rocker arm mechanism to be able to selectively transmit the driving lift of a cam that corresponds to the first cam-side rocker arm or the second cam-side rocker arm to the valve-side rocker arm.   
     
     
         3 . The variable valve actuation mechanism for an engine according to  claim 2 , wherein both of the upper part of the first cam-side rocker arm and the second cam-side rocker arm are provided with a plunger hole, and the plunger hole is a stepped hole; a driving plunger is slidably arranged in the plunger hole, the driving plunger of the first cam-side rocker arm is a stepped shaft, and the large-diameter section and the small-diameter section respectively have a gap match with the large-diameter hole and the small-diameter hole of the plunger hole; one end of the plunger hole with a larger-diameter of the first cam-side rocker arm is provided with a plug, the plug is provided with an exhaust hole; the return spring of the first cam-side rocker arm is located between the larger-diameter end of the driving plunger and the plug, and the smaller diameter end of the driving plunger of the first cam-side rocker arm is connected to the sliding block through the smaller diameter hole of the plunger hole;
 one end of the plunger hole of the second cam-side rocker arm is a cylindrical hole, and the other end is a waist-shaped hole; one end of the cylindrical hole of the plunger hole of the second cam-side rocker arm is provided with a sealed plug, and the driving plunger of the second cam-side rocker arm is a stepped shaft, the large-diameter section of the stepped shaft is a cylinder, which has a clearance fit with the cylinder hole of the plunger hole, the two sides of the small-diameter section of the stepped shaft are processed to be flat, and the sectional area of the flat is smaller than that of the waist-shaped hole at the other end of the plunger hole; the return spring of the second cam-side rocker arm is located between the driving plunger and the waist-shaped hole at the other end of the plunger hole, the end of the driving plunger which is processed into a flat of the second cam-side rocker arm is connected with the sliding block through the waist-shaped hole at the other end of the plunger hole;   both of the first cam-side rocker arm and the second cam-side rocker arm are provided with rocker arm oil passage, one end of the rocker arm oil passage is connected to the cavity formed by the end of the driving plunger without return spring and the plunger hole, and the other end is connected to the rocker arm shaft oil passage.   
     
     
         4 . The variable valve actuation mechanism for an engine according to  claim 3 , wherein the sliding block is a rectangular block with an arc surface or an inclined surface on one side; the end of the sliding block connected with the driving plunger is machined with a slot and a pin hole, and is connected with the driving plunger through a pin; the front end face of the sliding block in the forward direction which driven by the driving plunger is a circular arc surface or an inclined surface, the bottom surface of the sliding block is a plane, the top surface of the sliding block and the bottom surface of the beam structure of the valve-side rocker arm are planes, or the top surface of the sliding block is provided with an arc or wedge-shaped concave or convex, and the bottom surface of the beam structure of the valve-side rocker arm is provided with an arc or wedge-shaped convex which is matched with the top surface of the sliding block. 
     
     
         5 . The variable valve actuation mechanism for an engine according to  claim 1 , wherein the combined rocker arm mechanism has two cam-side rocker arms, the rocker arm shaft is provided with one rocker arm shaft oil passage, the rocker arm shaft oil passage is provided with one solenoid valve, and the rocker arm shaft oil passage is connected to the rocker arm oil passages of both of the two cam-side rocker arms, or the rocker arm shaft is provided with two rocker arm shaft oil passages, both of the two rocker arm shaft oil passages are respectively provided with a solenoid valve, and both of the two rocker arm shaft oil passages are respectively connected with the rocker arm oil passage of the two cam-side rocker arms; when the combined rocker arm mechanism has more than two cam-side rocker arms, the rocker arm shaft is separately provided with a rocker arm shaft oil passage for each cam-side rocker arm, and respectively connected with the rocker arm oil passage of each cam-side rocker arm, and each rocker arm shaft oil passage is provided with a solenoid valve. 
     
     
         6 . The variable valve actuation mechanism for an engine according to  claim 1 , wherein the middle part of the valve-side rocker arm is a gap, and a side wall is provided on both sides of the gap; the rocker arm shaft mounting hole is arranged on the side walls of the gap, the beam structure is located at the end of the valve-side rocker arm which near the camshaft, and the beam structure is connected with the two side walls of the valve-side rocker arm, the cam-side rocker arms are installed at the gap between the two side walls of the valve-side rocker arm. 
     
     
         7 . The variable valve actuation mechanism for an engine according to  claim 2 , wherein the valve-side rocker arm is a plate structure, the rocker arm shaft mounting hole is arranged in the middle of the plate structure, the beam structure is T-shaped structure, the cam-side rocker arms are respectively installed on the left and right side of the valve-side rocker arm. 
     
     
         8 . The variable valve actuation mechanism for an engine according to  claim 1 , wherein a rocker arm spring is arranged between the valve-side rocker arm and the cam-side rocker arm of the combined rocker arm mechanism, the rocker arm spring is a spiral spring or a torsion spring, the rocker arm spring is installed between the valve-side rocker arm and the cam-side rocker arm or on the rocker arm shaft, one end of the rocker arm spring acts on the valve-side rocker arm, and the other end acts on the cam-side rocker arm, the rocker arm spring has a certain preload force, so that the valve-side rocker arm is always kept in contact with the valve mechanism, and the cam-side rocker arm is always kept in contact with the cam. 
     
     
         9 . The variable valve actuation mechanism for an engine according to  claim 1 , wherein the cam-side rocker arm is provided with a roller, which is in contact with the corresponding cam on the cam shaft and is driven by the cam, alternatively, the cam-side rocker arm is provided with a ball socket or a ball joint structure, and the ball socket or ball joint structure is connected with a push rod driven by the cam shaft, and the ball socket or ball joint structure is driven by the push rod. 
     
     
         10 . A variable valve actuation mechanism for an engine comprising: a rocker arm mechanism, a camshaft, a rock shaft and a solenoid valve;
 wherein the rocker arm mechanism which is a combined rocker arm mechanism, includes one valve-side rocker arm and two cam-side rocker arm which are the first cam-side rocker arm and the second cam-side rocker arm; the valve-side rocker arm and the cam-side rocker arm are installed side by side on the rocker arm shaft, and can be rotated on the rocker arm shaft; the major structure of the cam-side rocker arm are all located on the side which is close to the camshaft, the camshaft is provided with a cam corresponding to each of the cam-side rocker arms, and the contours of each of the cams are different, and each of the cam-side rocker arm is driven up and down by the corresponding cam; the tops of the first cam-side rocker arm and the second cam-side rocker arm are respectively provided with a lug boss, and the two lug bosses are staggered front and rear; the upper part of the valve-side rocker arm is provided with a plunger hole, and the plunger hole is a stepped hole; a driving plunger which is a step shaft which is slidably arranged in the plunger hole, one end of the driving plunger is connected to the sliding block through the plunger hole, and a return spring is installed at one end of the plunger hole, and the other end the plunger hole is connected with the rocker arm oil passage; the rocker arm oil passage is arranged in the valve-side rocker arm, the rocker arm oil passage is connected with the rocker arm shaft oil passage, the rocker arm shaft oil passage is arranged in the rocker arm shaft, the sliding block can be driven by the lubrication oil with pressure from the rocker arm shaft oil passage; the solenoid valve is provided on the rocker arm shaft oil passage, the rocker arm shaft oil passage is controlled by the solenoid valve in an off or on state;   when the rocker arm shaft oil passage is in an off state, the sliding block has a first position under the drive of the preload of the return spring, at this position, the sliding block eliminates the gap between the first cam-side rocker arm and the valve-side rocker arm, and enable the first cam-side rocker arm and the valve-side rocker arm to form a transmission chain; the upper part of the lug boss of the second cam-side rocker arm is a gap of the sliding block, and the second cam-side rocker arm and the valve-side rocker arm cannot form a transmission chain;   when the rocker arm shaft oil passage is in an on state, the sliding block has a second position under drive of the lubrication oil, at this position, the sliding block eliminates the gap between the second cam-side rocker arm and the valve-side rocker arm, and enable the second cam-side rocker arm and the valve-side rocker arm to form a transmission chain; the upper part of the lug boss of the first cam-side rocker arm is a gap of the sliding block, and the first cam-side rocker arm and the valve-side rocker arm cannot form a transmission chain.   
     
     
         11 . The variable valve actuation mechanism for an engine according to  claim 10 , wherein one side of the lug boss of the cam-side rocker arm is a circular arc surface, and the center of the circular arc surface is concentric with the center of the rocker arm shaft hole; the sliding block is installed in a chute above the valve-side rocker arm, and located above the lug boss of the cam-side rocker arm; the sliding block is a cuboid block, and the left and right sides of the sliding block are respectively provided with a gap, a circular arc surface is provided on the gap at a position corresponding to the circular arc side surface of the upper lug boss of the cam-side rocker arm, and the circular arc surface has the same radius as the circular arc surface of the lug upper boss of the cam-side rocker arm. 
     
     
         12 . An engine comprising: a variable valve actuation mechanism for the engine according to  claim 1 . 
     
     
         13 . A variable valve actuation mechanism for the engine according to  claim 10 .