A gap self-adjusting engine valve drive device and engine thereof

Abstract

The utility model relates to an engine technical field especially relates to a clearance self -adjusting engine valve drive device and engine thereof, including integrated rocker, exhaust drive assembly, drive piston subassembly and biasing assembly, drive piston subassembly installs in the axle hole and is used for with the brake exhaust valve of engine cooperation, biasing assembly installs in the biasing hole, including the biasing rod with joint part, the pressure seat that is formed with the joint cavity for joint part carding and with its rotation cooperation and the return spring for the pressure seat is pressed to valve bridge to make both always contact, the utility model discloses utilize the return spring of pressure to the pressure seat and make biasing assembly form a self -adjusting elastic component to automatically eliminate the clearance between it and valve bridge, to guarantee integrated rocker and exhaust drive assembly always keep contact, and the driving force of exhaust drive assembly can be without delay transmission to integrated rocker, and then realize brake exhaust valve according to predetermined time opening or closing.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a gap self-adjusting engine valve drive device and its engine. Background Technology

[0002] A valve drive device generally includes an integrated rocker arm that is rotatably mounted on a rocker arm shaft, an exhaust drive assembly that provides driving force to the integrated rocker arm, and a drive piston assembly that converts the rotation of the integrated rocker arm into valve action. Its working principle is to use the exhaust drive assembly to drive the integrated rocker arm to swing back and forth around the rocker arm shaft, thereby driving the piston assembly to intermittently apply pressure to the brake exhaust valve, so as to drive the brake exhaust valve to open or close, thereby realizing the compression release braking of the engine.

[0003] To ensure the reliability and immediacy of force transmission and avoid action delays or failures caused by mechanism gaps, the existing technology generally adopts a biasing component installed on the side of the integrated rocker arm away from the exhaust drive assembly. This biasing component continuously applies a force to the integrated rocker arm, so that its other end is always pressed tightly against the exhaust drive assembly, thereby eliminating the assembly gap between the two and ensuring that the driving force of the exhaust drive assembly can be transmitted to the integrated rocker arm without delay when the braking command is issued.

[0004] However, the engine generates intense thermal cycles during operation, and its components undergo dimensional changes due to thermal expansion and contraction. These dimensional changes can lead to valve clearance between the bias assembly and the valve bridge, causing the exhaust drive assembly to separate from the integrated rocker arm, which in turn affects its positive power and braking lift. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to solve the problem that the engine in the prior art will generate a violent thermal cycle during operation, and its components will change in size due to thermal expansion and contraction. This change in size will cause valve clearance between the bias assembly and the valve bridge, resulting in the separation of the exhaust drive assembly and the integrated rocker arm, which in turn affects its positive power and braking lift. The present invention provides a clearance self-adjusting engine valve drive device and its engine.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a gap self-adjusting engine valve drive device, comprising: An integrated rocker arm has a shaft hole through which a rocker arm shaft passes to rotate with the rocker arm shaft, and a piston hole and a bias hole located on one side of the shaft hole; An exhaust drive assembly is located on the side opposite to the shaft hole and opposite to the piston hole to drive the integrated rocker arm to rotate about the rocker arm axis; A drive piston assembly is mounted in the shaft bore and is used to cooperate with the engine's brake exhaust valve; The biasing assembly is installed in the biasing hole and includes a biasing rod with a joint, a pressure seat having a joint cavity for the joint to engage and rotate with, and a return elastic member for pressing the pressure seat against the valve bridge so that the two are always in contact.

[0007] Furthermore, the biasing assembly has a lubrication channel formed within it, which supplies oil to the joint cavity to lubricate the joint. The lubrication channel includes an oil inlet channel located within the biasing rod and communicating with the joint cavity.

[0008] Furthermore, an oil chamber is formed within the biasing hole to allow oil to enter and press the pressure seat against the valve bridge through oil pressure.

[0009] Furthermore, the biasing rod includes a fixed rod body and a biasing piston that is slidably sleeved outside the fixed rod body and connected to the pressure seat. The biasing piston is slidably disposed in the oil chamber and can extend toward the valve bridge.

[0010] Furthermore, the biasing piston has a receiving cavity for accommodating and confining the fixed rod body inside, and the return elastic member is located in the receiving cavity with one end abutting against the bottom of the receiving cavity and the other end abutting against the outer limiting part provided on the outer peripheral wall of the fixed rod body.

[0011] Furthermore, the opening end of the receiving cavity is provided with an inner limiting part that abuts against the outer limiting part to limit the stroke of the bias piston.

[0012] Furthermore, the drive piston assembly also includes a limiting block disposed at the piston bore opening to limit the stroke of the drive piston and a reset elastic element located inside the piston bore for driving the drive piston to reset.

[0013] Furthermore, the pressure seat has an abutment portion at one end near the valve bridge, and the return elastic element is sleeved outside the pressure seat, with one end abutting against the abutment portion and the other end abutting against the integrated rocker arm.

[0014] Furthermore, the oil inlet passage includes an upper oil passage formed in the fixed rod body and communicating with the oil cavity, and a lower oil passage formed in the bias piston and communicating with the joint cavity, and the lower oil passage includes a large-diameter oil passage and a small-diameter oil passage for connecting the large-diameter oil passage and the joint cavity.

[0015] Furthermore, it also includes a control valve assembly, which includes a valve core unit movably disposed within the valve chamber of the integrated rocker arm, an elastic element for resetting the valve core unit, a first oil supply passage for supplying oil to the valve chamber, and a drive oil passage connected between the valve chamber and the piston bore for supplying oil to the piston assembly.

[0016] Furthermore, the lubricating oil passage also includes an oil outlet passage located within the pressure seat and communicating with the joint cavity.

[0017] An engine comprising the aforementioned clearance self-adjusting engine valve drive device.

[0018] The beneficial effects of this utility model are: 1. This utility model utilizes a return elastic element that applies pressure to the pressure seat to make the biasing component form a self-adjusting elastic element to automatically eliminate the gap between it and the valve bridge, thereby ensuring that the integrated rocker arm and the exhaust drive component always maintain contact. The driving force of the exhaust drive component can be transmitted to the integrated rocker arm without delay, thereby realizing the opening or closing of the brake exhaust valve at a predetermined time. After the gap is eliminated, the wear between the components can be reduced, the engine noise can be reduced, and the engine service life can be increased.

[0019] 2. This invention utilizes the oil cavity inside the biasing rod and the return elastic element outside the biasing rod to form a biasing force mainly based on oil pressure and supplemented by the elastic force of the return elastic element. This causes the biasing assembly to form a self-adjusting elastic element to automatically eliminate the gap between it and the valve bridge. On the one hand, it can avoid the phenomenon of separation between the biasing assembly and the valve bridge caused by the failure of the return elastic element. On the other hand, the joint of the biasing rod and the joint cavity of the pressure seat are always in contact, and the pressure seat and the valve bridge are always sealed, further reducing noise and wear. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the bias component in Embodiment 1; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model; Figure 4 This is a schematic diagram of the biasing component in Embodiment 2; Figure 5 This is a schematic diagram showing the state of the drive piston assembly when the control valve assembly is closed; Figure 6 This is a schematic diagram showing the state of the drive piston assembly when the control valve assembly is open; Figure 7 This is a diagram showing the flow direction of lubricating oil through the control valve assembly and when the control valve assembly is closed. Figure 8 This is a diagram showing the flow direction of lubricating oil through the control valve assembly and when the control valve assembly is open; Figure 9 This is a schematic diagram of the limiting block in the drive piston assembly; Figure 10 This is a schematic diagram of the structure of the limiting block and the limiting retaining ring in the drive piston assembly; Figure 11 This is a three-dimensional schematic diagram of the first embodiment of the present invention in conjunction with the valve bridge and the brake exhaust valve; Figure 12 This is a cross-sectional view of the first embodiment of the present invention in conjunction with the valve bridge and the brake exhaust valve; In the picture: 1. Integrated rocker arm; 101. Shaft hole; 102. Piston hole; 103. Bias hole; 1031. Oil chamber; 104. Valve chamber; 2. Exhaust drive assembly; 201. Brake lever; 202. Push rod; 203. Tappet; 204. Drive cam; 205. Brake nut; 3. Drive piston assembly; 301. Drive piston; 302. Limit block; 303. Limit retaining ring; 304. Reset elastic element; 4. Bias assembly; 401. Bias rod; 401a. Oil inlet passage; 4011. Fixed rod body; 4011a. Upper oil passage; 4012. Bias piston; 4012a. Large diameter oil passage; 4012b. Small diameter oil passage; 4013. Receiving cavity; 4014. Outer limiting part; 4015. Inner limiting part; 4016. Joint part; 402. Pressure seat; 402a. Oil outlet passage; 4021. Joint cavity; 4022. Abutment part; 403. Return elastic element; 404. Washer; 405. Bias nut; 5. Valve bridge; 6. Brake exhaust valve; 7. Control valve assembly; 701. Valve core unit; 702. Elastic element; 703. First oil supply circuit; 704. Drive oil circuit; 705. Second oil supply circuit; 706. Lubricating oil circuit. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components, orientations, and references (e.g., up, down, left, right, etc.) relevant to the present invention and are intended only to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0023] Example 1, as Figure 1 and Figure 2 As shown, a gap self-adjusting engine valve drive device includes an integrated rocker arm 1, an exhaust drive assembly 2, a drive piston assembly 3, a bias assembly 4, and a control valve assembly 7. The integrated rocker arm 1 has a shaft hole 101 through which the rocker arm shaft passes to rotate with the rocker arm shaft, and a piston hole 102 and a bias hole 103 located on one side of the shaft hole 101. Both the piston hole 102 and the bias hole 103 open downwards (i.e. towards the valve bridge 5). The exhaust drive assembly 2 is located on the side opposite to the shaft hole 101 and opposite to the piston hole 102 to drive the integrated rocker arm 1 to rotate around the rocker arm shaft. The shaft hole 101 is located between the exhaust drive assembly 2 and the piston hole 102. Under the action of the exhaust drive assembly 2, the integrated rocker arm 1 swings around the rocker arm shaft. like Figure 11 and Figure 12 As shown, the exhaust drive assembly 2 includes a brake rod 201 threadedly connected to the integrated rocker arm 1, a push rod 202 rotatably engaged with the brake rod 201, a tappet 203 sleeved on the outside of the push rod 202, and a drive cam 204 that drives the tappet 203 to rise and fall. The brake rod 201 and the push rod 202 form a spherical joint connection or a rotary joint connection. The end of the push rod 202 near the drive cam 204 is spherical. The brake rod 201 threadedly connected to the integrated rocker arm 1 can be rotated to manually adjust the brake clearance. A brake nut 205 is installed on the brake rod 201 to abut against the upper end face of the integrated rocker arm 1 to prevent the brake rod 201 from slipping. The drive piston assembly 3 is installed in the piston bore 102 and is used to cooperate with the engine's brake exhaust valve 6. The biasing assembly 4 is installed in the biasing hole 103 and includes a biasing rod 401 with a joint portion 4016, a pressure seat 402 with a joint cavity 4021 into which the joint portion 4016 is inserted and rotated, and a return elastic member 403 for pressing the pressure seat 402 against the valve bridge 5 so that the two are always in contact. The biasing rod 401 and the pressure seat 402 are also connected by a spherical joint or a rotary joint. The return elastic member 403 can be a spring, which can generate biasing force, so that the biasing assembly 4 forms a self-adjusting elastic member to automatically eliminate the gap between it and the valve bridge 5, thereby ensuring that the integrated rocker arm 1 and the exhaust drive assembly 2 are always in contact. The driving force of the exhaust drive assembly 2 can be transmitted to the integrated rocker arm 1 without delay, thereby realizing the opening or closing of the brake exhaust valve 6 at a predetermined time.

[0024] like Figure 5 and Figure 6As shown, the control valve assembly 7 is used to control the flow of oil into the piston hole 102 to drive the drive piston 301 in the piston assembly 3 to extend out of the piston hole 102 and move toward the brake exhaust valve 6. The control valve assembly 7 is a one-way valve structure, which includes a valve core unit 701 movably disposed in the valve chamber 104 of the integrated rocker arm 1, an elastic element 702 for driving the valve core unit 701 to reset, a first oil supply passage 703 for supplying oil to the valve chamber 104, and a drive oil passage 704 connected between the valve chamber 104 and the piston hole 102 to supply oil to the piston assembly 3. The elastic element 702 can be a spring, which is disposed in the valve chamber 104 and abuts against the valve core unit 701 at one end and against the bottom of the valve chamber 104 at the other end. The first oil supply passage 703 and the drive oil passage 704 are connected by a connecting oil passage, and a one-way valve is connected in series in the connecting oil passage.

[0025] The valve chamber 104 has an oil supply port connected to the first oil supply passage 703 and a drive port connected to the drive oil passage 704. In the initial state, the valve core unit 701 blocks the drive port. When the first oil supply passage 703 starts to fill with oil and the oil pressure is greater than the elastic force of the elastic element 702, the oil drives the valve core unit 701 to move and the elastic element 702 to compress. When the valve core unit 701 moves to open the drive port, the oil in the valve chamber 104 can enter the drive piston assembly 3 through the drive port and the drive oil passage 704 in sequence.

[0026] like Figure 1 and Figure 2 As shown, the pressure seat 402 is provided with an abutment part 4022 at one end near the valve bridge 5. The abutment part 4022 can be formed by protruding from the outer peripheral wall of the pressure seat 402 or a retaining ring stuck on the outer peripheral wall of the pressure seat 402. The return elastic member 403 is a helical spring, which is sleeved on the outside of the pressure seat 402, with one end abutting against the abutment part 4022 and the other end abutting against the lower end face of the integrated rocker arm 1. Preferably, a washer 404 is installed between the return elastic member 403 and the integrated rocker arm 1. In this embodiment, the biasing rod 401 is threadedly connected to the biasing hole 103. The exhaust gap can be manually adjusted by adjusting the position of the biasing rod 401 in the biasing hole 103. A biasing nut 405 is installed on the biasing rod 401 to abut against the upper end face of the integrated rocker arm 1 to prevent the biasing rod 401 from disengaging from the biasing hole 103. In this embodiment, the elastic force of the return elastic member 403 acts directly on the pressure seat 402 to give the pressure seat 402 floating space. Therefore, the joint 4016 can not only rotate in the joint cavity 4021, but also there is a certain gap between the joint 4016 and the cavity wall of the joint cavity 4021, so that the pressure seat 402 can float up and down.

[0027] like Figure 9 and Figure 10As shown, the drive piston assembly 3 further includes a limiting block 302 disposed at the opening of the piston hole 102 to limit the stroke of the drive piston 301, and a reset elastic member 304 located in the piston hole 102 and used to drive the drive piston 301 to reset. The limiting block 302 is disposed at the opening of the piston hole 102 to prevent the drive piston 301 from disengaging from the piston hole 102.

[0028] The reset elastic element 304 can be a spring, which is located between the drive piston 301 and the limiting block 302. The drive piston 301 and the limiting block 302 are recessed on the side that are close to each other, forming a groove. The openings of the two grooves are opposite each other, and the two ends of the reset elastic element 304 abut against the bottom of the two grooves respectively.

[0029] The position of the limiting block 302 can be fixed or movable. The movable setting can be achieved by threading the limiting block 302 with the piston hole 102. This method can adjust the stroke of the driving piston 301 as needed. The fixed setting can be achieved by setting a limiting retaining ring 303 at the opening of the piston hole 102 to limit the position of the limiting block 302. The limiting retaining ring 303 can be an elastic retaining ring. In a specific implementation, the opening of the piston hole 102 is recessed to form a groove. The limiting retaining ring 303 is inserted into the groove to support the limiting block 302 and limit the limiting block 302 within the piston hole 102. The limiting block 302 has a stepped surface for abutting against the limiting retaining ring 303.

[0030] like Figure 2 As shown, the biasing assembly 4 has a lubrication channel formed inside to supply oil into the joint cavity 4021 to lubricate the joint portion 4016. In this embodiment, the lubrication channel includes an oil inlet channel 401a located inside the biasing rod 401 and communicating with the joint cavity 4021. Preferably, it also includes an oil outlet channel 402a located in the pressure seat 402 and communicating with the joint cavity 4021. The oil outlet channel 402a passes through the pressure seat 402 to discharge the lubricating oil.

[0031] Example 2, as Figure 3 and Figure 4 As shown, the difference between Embodiment 2 and Embodiment 1 is that: an oil chamber 1031 is formed in the biasing hole 103 to allow oil to enter and press the pressure seat 402 against the valve bridge 5, thereby forming a biasing force mainly based on oil pressure and supplemented by the elastic force of the return elastic element 403. This makes the biasing assembly 4 a self-adjusting elastic element to automatically eliminate the gap between it and the valve bridge 5. On the one hand, it avoids the phenomenon of separation between the biasing assembly 4 and the valve bridge 5 caused by the failure of the return elastic element 403. On the other hand, the shape of the joint 4016 of the biasing rod 401 and the joint cavity 4021 of the pressure seat 402 are completely matched, and the pressure seat 402 and the valve bridge 5 are sealed. This overcomes the noise and wear caused by the small gap between the joint 4016 and the joint cavity 4021 of the pressure seat 402 in Embodiment 1, and further improves the service life of the engine.

[0032] In this embodiment, the oil is continuously injected into the oil chamber 1031, which may or may not pass through the control valve assembly 7. The oil flow direction passing through the control valve assembly 7 is shown below. Figure 7 and Figure 8 It includes a second oil supply passage 705 for providing lubricating oil to the valve chamber 104 and a lubricating oil passage 706 for connecting the valve chamber 104 and the bias hole 103. The second oil supply passage 705, the valve chamber 104 and the lubricating oil passage 706 are always connected to form a normally open state of lubricating oil.

[0033] The biasing rod 401 includes a fixed rod body 4011 and a biasing piston 4012 slidably sleeved outside the fixed rod body 4011 and connected to the pressure seat 402. The fixed rod body 4011 is threadedly connected to the piston hole 102. The biasing piston 4012 is slidably disposed in the oil chamber 1031 and can extend towards the valve bridge 5 under oil pressure. Correspondingly, the pressure seat 402 connected to the biasing piston 4012 also extends towards the valve bridge 5 to achieve continuous contact between the two.

[0034] The biasing piston 4012 has a receiving cavity 4013 for accommodating and confining the fixed rod 4011 inside. The return elastic member 403 is located in the receiving cavity 4013, with one end abutting against the bottom of the receiving cavity 4013 and the other end abutting against the outer limiting part 4014 protruding from the outer peripheral wall of the fixed rod 4011. The biasing piston 4012 can extend towards the valve bridge 5 under the elastic force of the return elastic member 403.

[0035] The opening end of the receiving cavity 4013 is provided with an inner limiting part 4015 that abuts against the outer limiting part 4014 to limit the stroke of the bias piston 4012. The inner limiting part 4015 may be, but is not limited to, an elastic retaining ring. The cavity wall of the receiving cavity 4013 is recessed to form an embedding groove. The inner limiting part 4015 is engaged in the embedding groove to form the top of the receiving cavity 4013 to prevent the fixing rod 4011 from sliding out of the receiving cavity 4013.

[0036] The oil inlet passage 401a in the bias rod 401 includes an upper oil passage 4011a formed in the fixed rod body 4011 and communicating with the oil chamber 1031, and a lower oil passage formed in the bias piston 4012 and communicating with the joint cavity 4021. The lower oil passage includes a large-diameter oil passage 4012a and a small-diameter oil passage 4012b for connecting the large-diameter oil passage 4012a and the joint cavity 4021. The diameter of the small-diameter oil passage 4012b is smaller than the diameter of the large-diameter oil passage 4012a to maintain sufficient oil pressure to apply pressure to the bias piston 4012. The diameter of the small-diameter oil passage 4012b is 0.5mm-3mm.

[0037] Example 3 provides an engine including the aforementioned clearance self-adjusting engine valve drive device.

[0038] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A gap-adjusting engine valve drive device, characterized in that: include: The integrated rocker arm (1) has a shaft hole (101) through which the rocker arm shaft passes to rotate with the rocker arm shaft, and a piston hole (102) and a bias hole (103) located on one side of the shaft hole (101). The exhaust drive assembly (2) is located on the side opposite to the shaft hole (101) and opposite to the piston hole (102) to drive the integrated rocker arm (1) to rotate about the rocker arm axis; Drive piston assembly (3), installed in the piston bore (102) and used to cooperate with the engine's brake exhaust valve (6); And biasing assembly (4), installed in the biasing hole (103), including biasing rod (401) having joint (4016), pressure seat (402) forming a joint cavity (4021) for the joint (4016) to be inserted into and rotated therewith, and return elastic member (403) for pressing the pressure seat (402) against the valve bridge (5) so that the two are always in contact.

2. The gap self-adjusting engine valve drive device according to claim 1, characterized in that: The biasing assembly (4) has a lubrication channel formed therein, which supplies oil to enter the joint cavity (4021) to lubricate the joint (4016). The lubrication channel includes an oil inlet channel (401a) located in the biasing rod (401) and communicating with the joint cavity (4021).

3. The gap self-adjusting engine valve drive device according to claim 2, characterized in that: An oil chamber (1031) is formed inside the bias hole (103) to supply oil so as to press the pressure seat (402) against the valve bridge (5) by oil pressure.

4. The gap self-adjusting engine valve drive device according to claim 3, characterized in that: The bias rod (401) includes a fixed rod body (4011) and a bias piston (4012) that is slidably sleeved outside the fixed rod body (4011) and connected to the pressure seat (402). The bias piston (4012) is slidably disposed in the oil chamber (1031) and can extend toward the valve bridge (5).

5. The gap self-adjusting engine valve drive device according to claim 4, characterized in that: The bias piston (4012) has a receiving cavity (4013) for accommodating and confining the fixed rod (4011) inside. The return elastic member (403) is located in the receiving cavity (4013) with one end abutting against the bottom of the receiving cavity (4013) and the other end abutting against the outer limiting part (4014) provided on the outer peripheral wall of the fixed rod (4011).

6. The gap self-adjusting engine valve drive device according to claim 5, characterized in that: The opening end of the receiving cavity (4013) is provided with an inner limiting part (4015) that abuts against the outer limiting part (4014) to limit the stroke of the bias piston (4012).

7. The gap self-adjusting engine valve drive device according to claim 1, characterized in that: The drive piston assembly (3) further includes a limiting block (302) disposed at the opening of the piston hole (102) to limit the stroke of the drive piston (301) and a reset elastic element (304) located in the piston hole (102) for driving the drive piston (301) to reset.

8. The gap self-adjusting engine valve drive device according to claim 1, characterized in that: The pressure seat (402) has an abutment part (4022) at one end near the valve bridge (5). The return elastic element (403) is sleeved on the outside of the pressure seat (402), with one end abutting against the abutment part (4022) and the other end abutting against the integrated rocker arm (1).

9. A clearance self-adjusting engine valve drive device according to claim 5, characterized in that: The oil inlet passage (401a) includes an upper oil passage (4011a) formed in the fixed rod body (4011) and communicating with the oil cavity (1031) and a lower oil passage formed in the bias piston (4012) and communicating with the joint cavity (4021). The lower oil passage includes a large-diameter oil passage (4012a) and a small-diameter oil passage (4012b) for connecting the large-diameter oil passage (4012a) and the joint cavity (4021).

10. The gap self-adjusting engine valve drive device according to claim 1, characterized in that: It also includes a control valve assembly (7), which includes a valve core unit (701) movably disposed in the valve chamber (104) of the integrated rocker arm (1), an elastic element (702) for resetting the valve core unit (701), a first oil supply passage (703) for supplying oil to the valve chamber (104), and a drive oil passage (704) connected between the valve chamber (104) and the piston hole (102) for supplying oil to the drive piston assembly (3).

11. A gap self-adjusting engine valve drive device according to claim 2, characterized in that: The lubrication passage also includes an oil outlet passage (402a) located within the pressure seat (402) and communicating with the joint cavity (4021).

12. An engine, characterized in that: Including a clearance self-adjusting engine valve drive device as described in any one of claims 1-11.

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