Clearance self-adjusting engine valve driving device and engine thereof

Abstract

The invention relates to the technical field of engines, in particular to a clearance self-adjusting engine valve driving device and an engine thereof.The clearance self-adjusting engine valve driving device comprises an integrated rocker arm, an exhaust driving assembly, a driving piston assembly and a bias pressure assembly, and the driving piston assembly is installed in a shaft hole and used for being matched with a brake exhaust valve of the engine; the bias pressure assembly is mounted in the bias pressure hole and comprises a bias pressure rod with a joint part, a pressure seat and a return elastic piece; the pressure seat is provided with a joint cavity which is used for clamping the joint part and is in running fit with the joint part; the return elastic piece is used for pressing the pressure seat to the valve bridge to enable the pressure seat and the valve bridge to be in contact all the time; according to the invention, the return elastic piece which applies pressure to the pressure seat is utilized to enable the bias pressure assembly to form a self-adjusting elastic piece to automatically eliminate a gap between the bias pressure assembly and the valve bridge, so that the integrated rocker arm is always kept in contact with the exhaust driving assembly, and the driving force of the exhaust driving assembly can be transmitted to the integrated rocker arm without delay; therefore, the brake exhaust valve is opened or closed according to the preset time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine, in particular to a gap self-adjusting engine valve drive device and an engine thereof. BACKGROUND

[0002] The valve drive device generally comprises a rotatable integrated rocker arm installed on a rocker shaft, an exhaust drive assembly for providing driving force to the integrated rocker arm, and a driving piston assembly for converting the rotation of the integrated rocker arm into valve action, and its working principle is to drive the integrated rocker arm to reciprocate around the rocker shaft by using the exhaust drive assembly to drive the integrated rocker arm to reciprocate around the rocker shaft, so as to intermittently press the brake exhaust valve by the piston assembly to drive the brake exhaust valve to open or close, thereby realizing the compression release brake of the engine.

[0003] In order to ensure the reliability and immediacy of force transmission and avoid the action delay or failure caused by the gap between mechanisms, the prior art generally installs a biasing assembly on the side of the integrated rocker arm away from the exhaust drive assembly, which continuously applies an acting force to the integrated rocker arm, so that the other end of the integrated rocker arm is always pressed 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 brake command is issued.

[0004] However, during the operation of the engine, a severe thermal cycle is generated, and the size of the parts will change due to the thermal expansion and contraction effect, which will cause the valve gap between the biasing assembly and the valve bridge, cause the separation phenomenon between the exhaust drive assembly and the integrated rocker arm, and further affect the positive work and brake lift of the integrated rocker arm. SUMMARY

[0005] The technical problem to be solved by the present application is that the prior art engine working process will generate a severe thermal cycle, and the size of the parts will change due to the thermal expansion and contraction effect, which will cause the valve gap between the biasing assembly and the valve bridge, cause the separation phenomenon between the exhaust drive assembly and the integrated rocker arm, and further affect the positive work and brake lift of the integrated rocker arm.

[0006] In order to solve the above technical problems, the present application adopts the following technical scheme: a gap self-adjusting engine valve drive device, comprising: an integrated rocker arm having a shaft hole for the rocker shaft to pass through to rotate with the rocker shaft, and a piston hole and a biasing hole located on one side of the shaft hole; an exhaust drive assembly located on the side away from the shaft hole and away from the piston hole to drive the integrated rocker arm to rotate around the rocker shaft; a driving piston assembly installed in the shaft hole and used to cooperate with the brake exhaust valve of the engine; and a biasing assembly mounted in the biasing hole and comprising a biasing rod with a joint part, a pressing base formed with a joint cavity for the joint part to be clamped into and rotationally fitted with, and a return elastic member for pressing the pressing base towards the valve bridge so that the two are always in contact.

[0007] Further, the biasing assembly is formed with a lubricating oil passage for oil to enter the joint cavity to lubricate the joint part, the lubricating oil passage comprising an oil inlet passage in the biasing rod and communicated with the joint cavity.

[0008] Further, the biasing hole is formed with an oil cavity for oil to enter so as to press the pressing base towards the valve bridge by oil pressure.

[0009] Further, the biasing rod comprises a fixed rod body and a biasing piston slidingly sleeved outside the fixed rod body and connected with the pressing base, the biasing piston being slidingly arranged in the oil cavity and extendable towards the valve bridge.

[0010] Further, the biasing piston is formed with a containing cavity for containing the fixed rod body and defining the fixed rod body inside, the return elastic member being located in the containing cavity and abutting against one end of the containing cavity and the other end of the containing cavity and an outer limiting part provided on the peripheral wall of the fixed rod body.

[0011] Further, an opening end of the containing cavity is provided with an inner limiting part abutting against the outer limiting part to limit the stroke of the biasing piston.

[0012] Further, the driving piston assembly further comprises a limiting block arranged at the aperture of the piston hole to limit the stroke of the driving piston and a reset elastic member located in the piston hole and used to drive the driving piston to reset.

[0013] Further, an abutting part is arranged at one end of the pressing base close to the valve bridge, the return elastic member is sleeved outside the pressing base and abuts against one end of the abutting part and the other end of the abutting part and the integrated rocker arm.

[0014] Further, the oil inlet passage comprises an upper oil passage formed in the fixed rod body and communicated with the oil cavity and a lower oil passage formed in the biasing piston and communicated with the joint cavity, and the lower oil passage comprises a large-diameter oil passage and a small-diameter oil passage for connecting the large-diameter oil passage and the joint cavity.

[0015] Further, a control valve assembly is further included, the control valve assembly comprising a valve core unit movably arranged in a valve cavity of the brake rocker arm, an elastic element for driving the valve core unit to reset, a first oil supply path for supplying oil to the valve cavity, and a driving oil path connected between the valve cavity and the piston hole for supplying oil to the driving piston assembly.

[0016] Further, the lubricating oil passage further comprises an oil outlet passage in the pressing base and communicated with the joint cavity.

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

[0018] The beneficial effects of this invention are: 1. This invention 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 the present invention; 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 11is a three-dimensional schematic view of the embodiment one of the application cooperating with the valve bridge and the brake exhaust valve; Figure 12 is a sectional view of the embodiment one of the application cooperating with the valve bridge and the brake exhaust valve; In the figure: 1, integrated rocker arm; 101, shaft hole; 102, piston hole; 103, biasing hole; 1031, oil cavity; 104, valve cavity; 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 check ring; 304, reset elastic member; 4, biasing assembly; 401, biasing lever; 401a, oil inlet; 4011, fixed lever body; 4011a, oil inlet; 4012, biasing piston; 4012a, large diameter oil passage; 4012b, small diameter oil passage; 4013, containing cavity; 4014, outer limit part; 4015, inner limit part; 4016, joint part; 402, pressure seat; 402a, oil outlet; 4021, joint cavity; 4022, abutment part; 403, reset elastic member; 404, washer; 405, biasing nut.

[0022] 5, valve bridge; 6, brake exhaust valve; 7, control valve assembly; 701, valve core unit; 702, elastic element; 703, first oil supply path; 704, drive oil path; 705, second oil supply path; 706, lubricating oil path. DETAILED DESCRIPTION

[0023] The application will now be described in further detail with reference to the drawings. These drawings are simplified schematic illustrations of the basic structure of the application and are therefore only showing the features relevant to the application. Directions and references (e.g. up, down, left, right, etc.) can only be used to facilitate the description of the features in the drawings. The following detailed description is therefore not to be taken in a limiting sense and the scope of the subject matter sought to be protected is defined only by the claims that follow this detailed description and their equivalents.

[0024] Embodiment one: the embodiment as shown in Figure 1 and Figure 2 As shown in the figure, 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 biasing assembly 4 and a control valve assembly 7. The integrated rocker arm 1 has a shaft hole 101 for the rocker shaft to pass through to rotate with the rocker shaft, and a piston hole 102 and a biasing hole 103 located on one side of the shaft hole 101, both of which are open downward (i.e. towards the valve bridge 5); The exhaust driving assembly 2 is located on the side away from the shaft hole 101 and the piston hole 102 to drive the integrated rocker arm 1 to rotate around the rocker shaft, and the shaft hole 101 is located between the exhaust driving assembly 2 and the piston hole 102, and the integrated rocker arm 1 swings around the rocker shaft under the action of the exhaust driving assembly 2; As shown in Figure 11 and Figure 12 The exhaust driving assembly 2 includes a brake lever 201 threadedly connected with the integrated rocker arm 1, a push rod 202 in rotational cooperation with the brake lever 201, a tappet 203 sleeved outside the push rod 202, and a driving cam 204 driving the tappet 203 to lift and lower, a spherical pair connection or rotational pair connection is formed between the brake lever 201 and the push rod 202, and the end of the push rod 202 close to the driving cam 204 is spherical, the brake lever 201 threadedly connected with the integrated rocker arm 1 can manually adjust the brake clearance by rotating, and a brake nut 205 is installed on the brake lever 201 to abut against the upper end surface of the integrated rocker arm 1 to prevent the brake lever 201 from slipping off; The driving piston assembly 3 is installed in the piston hole 102 and used to cooperate with the brake exhaust valve 6 of the engine; The biasing assembly 4 is installed in the biasing hole 103 and includes a biasing lever 401 having a joint portion 4016, a pressing seat 402 formed with a joint cavity 4021 for the joint portion 4016 to be clamped into and in rotational cooperation with, and a return elastic member 403 for pressing the pressing seat 402 towards the valve bridge 5 to ensure that the two are always in contact, a spherical pair connection or rotational pair connection is also formed between the biasing lever 401 and the pressing seat 402, the return elastic member 403 can be a spring, which can form a 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 driving assembly 2 are always in contact, the driving force of the exhaust driving assembly 2 can be transmitted to the integrated rocker arm 1 without delay, and then the brake exhaust valve 6 is opened or closed according to the predetermined time.

[0025] As shown in Figure 5 and Figure 6As shown, the control valve assembly 7 is used to control the oil flow 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 towards the brake exhaust valve 6, the control valve assembly 7 is a one-way valve structure, which comprises a valve core unit 701 movably arranged in a valve cavity 104 of the brake rocker arm 1, a resilient element 702 for driving the valve core unit 701 to reset, a first oil supply path 703 for supplying oil to the valve cavity 104, and a drive oil path 704 connected between the valve cavity 104 and the piston hole 102 for supplying oil to the drive piston assembly 3, the resilient element 702 can be a spring arranged in the valve cavity 104 and abutting against one end of the valve core unit 701 and the other end of the valve cavity 104, the first oil supply path 703 and the drive oil path 704 are communicated through a connecting oil path, and a one-way valve is connected in series in the connecting oil path.

[0026] The valve cavity 104 has an oil supply port communicated with the first oil supply path 703 and a drive port communicated with the drive oil path 704, in the initial state, the valve core unit 701 blocks the drive port, when the first oil supply path 703 starts to fill oil and the oil pressure is greater than the elastic force of the resilient element 702, the oil drives the valve core unit 701 to move, and the resilient element 702 is compressed, when the valve core unit 701 moves to open the drive port, the oil in the valve cavity 104 can enter the drive piston assembly 3 through the drive port and the drive oil path 704 in turn.

[0027] As shown in Figure 1 and Figure 2 The abutting portion 4022 is formed by the outer wall of the pressure seat 402 or is a blocking ring arranged on the outer wall of the pressure seat 402, the return elastic member 403 is a coil spring, which is sleeved outside the pressure seat 402 and abuts against one end of the abutting portion 4022 and the other end of the lower end surface of the integrated rocker arm 1, preferably, a gasket 404 is arranged between the return elastic member 403 and the integrated rocker arm 1, in the embodiment, the biasing rod 401 is threadedly connected with 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, and the biasing nut 405 is arranged on the biasing rod 401 and abuts against the upper end surface of the integrated rocker arm 1 to prevent the biasing rod 401 from being separated from the biasing hole 103; The elastic force of the return elastic member 403 in the embodiment directly acts on the pressure seat 402 to make the pressure seat 402 have a floating space, so that the joint portion 4016 can not only rotate in the joint cavity 4021 but also have a certain gap between the joint portion 4016 and the cavity wall of the joint cavity 4021, so that the pressure seat 402 can float up and down.

[0028] As shown in Figure 9 and Figure 10As shown, the driving piston assembly 3 further comprises a limiting block 302 arranged at the aperture of the piston hole 102 to limit the stroke of the driving piston 301, and a reset elastic member 304 arranged in the piston hole 102 and used to drive the driving piston 301 to reset, the limiting block 302 is arranged at the aperture of the piston hole 102 to prevent the driving piston 301 from escaping from the piston hole 102.

[0029] The reset elastic member 304 can be a spring, which is arranged between the driving piston 301 and the limiting block 302, and the side of the driving piston 301 and the limiting block 302 close to each other is recessed to form a groove, the two grooves are opposite, and the reset elastic member 304 is in abutment with the groove bottom of the two grooves at both ends.

[0030] The position of the limiting block 302 can be fixedly arranged or movably arranged, the movably arranged can adopt the mode that the limiting block 302 is threadedly connected with the piston hole 102, which can adjust the stroke of the driving piston 301 according to needs, and the fixedly arranged can adopt the mode that a limiting retaining ring 303 is arranged at the aperture 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, and the specific embodiment can be that the aperture of the piston hole 102 is recessed to form a clamping groove, the limiting retaining ring 303 is clamped into the clamping groove to hold the limiting block 302 to limit the limiting block 302 in the piston hole 102, and the limiting block 302 is formed with a stepped surface used to abut against the limiting retaining ring 303.

[0031] As shown in the figures, Figure 2 As shown, the biasing assembly 4 is formed with a lubricating oil channel for oil entering the joint cavity 4021 to lubricate the joint part 4016, and in the embodiment, the lubricating oil channel comprises an oil inlet channel 401a arranged in the biasing rod 401 and communicated with the joint cavity 4021, and preferably, further comprises an oil outlet channel 402a arranged in the pressing seat 402 and communicated with the joint cavity 4021, and the oil outlet channel 402a penetrates through the pressing seat 402 to discharge lubricating oil.

[0032] As shown in the figures, Figure 3 and Figure 4 As shown in the figures, the difference between the second embodiment and the first embodiment is that the biasing hole 103 is formed with an oil cavity 1031 for oil entering to press the pressing seat 402 towards the valve bridge 5, so as to form a biasing force mainly by oil pressure and supplemented by the elastic force of the reset elastic member 403, and the biasing assembly 4 forms a self-adjusting elastic member to automatically eliminate the gap between the biasing assembly 4 and the valve bridge 5, on the one hand, avoiding the phenomenon that the biasing assembly 4 is separated from the valve bridge 5 due to the failure of the reset elastic member 403, and on the other hand, the joint part 4016 of the biasing rod 401 and the joint cavity 4021 of the pressing seat 402 are completely matched in shape, and the pressing seat 402 and the valve bridge 5 are sealingly arranged, overcoming the noise and wear caused by the small gap between the joint part 4016 and the joint cavity 4021 of the pressing seat 402 in the first embodiment, and further improving the service life of the engine.

[0033] The oil liquid in the embodiment is continuously injected into the oil cavity 1031, which can pass through the control valve assembly 7 or not pass through the control valve assembly 7. The oil liquid flow direction passing through the control valve assembly 7 is shown in the following figure. Figure 7 And Figure 8 The second oil supply path 705 for supplying lubricating oil to the valve cavity 104 and the lubricating oil path 706 for connecting the valve cavity 104 and the biasing hole 103 are always in communication to form a constant open state of the lubricating oil.

[0034] The biasing rod 401 includes a fixed rod body 4011 and a biasing piston 4012 which is sleeved outside the fixed rod body 4011 and connected with the pressure seat 402. The fixed rod body 4011 is threadedly connected with the piston hole 102. The biasing piston 4012 is slidably arranged in the oil cavity 1031 and can be extended in the direction of the valve bridge 5 under the action of oil pressure. Correspondingly, the pressure seat 402 connected with the biasing piston 4012 is also extended in the direction of the valve bridge 5 to realize the continuous contact of the two.

[0035] The biasing piston 4012 forms an accommodating cavity 4013 for accommodating the fixed rod body 4011 and limiting it inside. The return elastic member 403 is located in the accommodating cavity 4013 and abuts against the cavity bottom of the accommodating cavity 4013 at one end and abuts against the outer limiting portion 4014 protruding from the outer peripheral wall of the fixed rod body 4011 at the other end. The biasing piston 4012 can be extended in the direction of the valve bridge 5 under the elastic force of the return elastic member 403.

[0036] The opening end of the accommodating cavity 4013 is provided with an inner limiting portion 4015 which abuts against the outer limiting portion 4014 to limit the stroke of the biasing piston 4012. The inner limiting portion 4015 can be but is not limited to an elastic retaining ring. The cavity wall of the accommodating cavity 4013 is recessed to form an embedding groove. The inner limiting portion 4015 is clamped in the embedding groove to form the cavity top of the accommodating cavity 4013 to prevent the fixed rod body 4011 from sliding out of the accommodating cavity 4013.

[0037] The oil inlet channel 401a in the biasing rod 401 includes an upper oil channel 4011a formed in the fixed rod body 4011 and in communication with the oil cavity 1031 and a lower oil channel formed in the biasing piston 4012 and in communication with the joint cavity 4021. The lower oil channel includes a large-diameter oil channel 4012a and a small-diameter oil channel 4012b for connecting the large-diameter oil channel 4012a and the joint cavity 4021. The diameter of the small-diameter oil channel 4012b is smaller than that of the large-diameter oil channel 4012a to maintain sufficient oil pressure to press the biasing piston 4012. The diameter of the small-diameter oil channel 4012b is 0.5mm-3mm.

[0038] Embodiment three provides an engine including the above-mentioned gap self-adjusting engine valve driving device.

[0039] The above-described embodiments according to the present application are intended to be illustrative only. Changes can be made by those skilled in the art, without departing from the scope of the present application, which is defined by the following claims. The technical scope of the present application is not limited to the above-described embodiments. The technical scope of the present application must be determined based on 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 gap-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 brake 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) 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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