CN216342366U - Engine rocker arm assembly and diesel engine - Google Patents

Abstract

The utility model provides an engine rocker arm assembly and a diesel engine. The rocker arm seat comprises a first seat body and a second seat body, the connecting part is connected with the first seat body and the second seat body, the rocker arm comprises an air inlet rocker arm and an air outlet rocker arm, and the air inlet rocker arm and the air outlet rocker arm are respectively and rotatably arranged on the connecting part. The engine rocker arm assembly can avoid the central area of a cylinder cover after being installed on an engine, thereby being beneficial to the arrangement of an oil injector/a spark plug. Meanwhile, the arrangement scheme of the middle rocker arm and the side rocker arm seat is beneficial to arranging the rocker arm component in a small space, and the first seat body and the second seat body are respectively supported at two sides, so that the strength and the reliability of the mechanism can be improved.

Description

Engine rocker arm assembly and diesel engine

Technical Field

The utility model relates to the field of marine diesel engines, in particular to an engine rocker arm assembly and a diesel engine.

Background

The rocker arm assembly of the engine is an important part of the engine and also an important part in a valve mechanism of the engine. In the running process of the engine, the rocker arm component controls the valve to be effectively opened and closed in the high-speed running process, so that the gas distribution function is realized.

With the technical development of high-power and high-density diesel engines, the engine is more compact in arrangement, the structural arrangement of a valve train is more challenged, and higher requirements on the reliability and adaptability of parts are provided. In the prior art, a rocker arm shaft is assembled in a rocker arm seat hole in an interference manner, and rocker arms are arranged on two sides of the rocker arm seat.

However, the existing rocker arm assembly also has the problems that the rocker arm is complex in structure, difficult to arrange in a high-density compact engine, complicated in installation process and the like.

SUMMERY OF THE UTILITY MODEL

One object of the present invention is to provide an engine rocker arm assembly that can improve the range of applicability of the rocker arm assembly.

An engine rocker arm assembly for solving the foregoing objects includes a rocker arm seat, a connecting portion, and a rocker arm. The rocker arm seat comprises a first seat body and a second seat body, a connecting part is connected with the first seat body and the second seat body, the rocker arm comprises an air inlet rocker arm and an air outlet rocker arm, and the air inlet rocker arm and the air outlet rocker arm are respectively and rotatably arranged on the connecting part. The air inlet rocker arm and the exhaust rocker arm are respectively arranged on the connecting part between the first base body and the second base body, so that the air inlet rocker arm and the exhaust rocker arm are positioned between the first base body and the second base body, and can avoid the central area of a cylinder cover after being installed on an engine, thereby being beneficial to the arrangement of an oil injector/a spark plug. Meanwhile, the arrangement scheme of laterally arranging the rocker arm seats in the rocker arms is beneficial to arrangement of rocker arm components in a small space, and the first seat body and the second seat body are respectively supported at two sides, so that the strength and the reliability of the mechanism can be improved.

In one or more embodiments, the connecting portion has a shaft section, and the intake rocker arm and the exhaust rocker arm are respectively fitted to the shaft section with a clearance fit and are respectively rotatable about an axial direction of the shaft section as a rotation axis. The mode that the shaft section allows the air inlet rocker arm and the exhaust rocker arm to rotate is easy to realize, and the assembling process is simple and convenient.

In one or more embodiments, the rocker arm seat and the connecting portion are respectively opened with a first lubricating oil channel, the first lubricating oil channel has an oil inlet and an oil outlet, the first lubricating oil channel is communicated with the outside through the oil inlet, and the oil outlet is disposed at the joint of the rocker arm and the connecting portion. Lubricating oil is reasonably distributed in the rocker arm seat and the connecting part, so that lubrication is convenient to realize the actuation process of the air inlet rocker arm and the exhaust rocker arm.

In one or more embodiments, a bushing is further arranged between the rocker arm and the connecting portion, the intake rocker arm and the exhaust rocker arm are respectively provided with an inner hole, and the bushing is fixedly connected to the inner holes and then assembled on the shaft section in a clearance fit manner; the inner periphery of the bushing is provided with a ring groove, a through hole is formed in the ring groove, the ring groove is communicated with the inner hole through the through hole, and the ring groove is communicated with the oil outlet in an assembling state. Through setting up the bush, can be convenient for install intake rocker arm and exhaust rocker arm on the shaft part, reduce the wearing and tearing to the rocking arm axle at the actuation in-process simultaneously. Set up annular and through-hole structure simultaneously, be convenient for still carry out the fuel feeding to air inlet rocker arm and exhaust rocker arm at the rotation in-process, improve lubricated efficiency.

In one or more embodiments, the bushing is assembled in the inner hole in an interference fit mode, and the installation process is simple and easy to achieve.

In one or more embodiments, a second oil passage is further provided in the intake rocker arm and/or the exhaust rocker arm, and one end of the second oil passage communicates with the first oil passage and the other end extends to an end of the intake rocker arm and/or the exhaust rocker arm. By arranging the second lubricating oil channel, lubricating oil can be delivered to two ends of the rocker arm to lubricate the rocker arm/push rod and the rocker arm/valve bridge kinematic pair, so that reliable lubrication is provided for the rocker arm/push rod and the rocker arm/valve bridge kinematic pair.

In one or more embodiments, the shaft section has a clamping groove therein, and a clamping ring is disposed in the clamping groove and clamped therein to limit movement of the intake rocker arm and the exhaust rocker arm in the axial direction. Carry out spacing mode through setting up the snap ring and easily assemble.

In one or more embodiments, the connecting portion is fixedly connected to the first seat and the second seat by fasteners, respectively. The connecting part is installed on the rocker arm seat through the fastener, so that the installation difficulty of the connecting part is reduced and the assembly efficiency is improved.

It is another object of the present invention to provide a diesel engine including an engine rocker arm assembly as in one or more of the previous embodiments, the rocker arm carrier being mounted to a cylinder head of the diesel engine.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

FIG. 1 is a perspective view of an engine rocker arm assembly according to some embodiments of the present application;

FIG. 2 is an exploded schematic view of an engine rocker arm assembly according to some embodiments of the present application;

FIG. 3 is a cross-sectional schematic view of an engine rocker arm assembly according to some embodiments of the present application;

FIG. 4 is a perspective view of a liner according to some embodiments of the present application;

FIG. 5 is a cross-sectional schematic view of an intake rocker arm according to some embodiments of the present application.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In prior engine rocker arm assemblies, the rocker shaft is interference fit in the rocker seat bore with the rocker arms disposed on either side of the rocker seat. However, after the research of the inventor, the following problems still exist in the configuration of the rocker arm assembly:

1) the rocker arm is positioned on two sides of the rocker arm seat and is in a cantilever structure shape, and when the rocker arm is used, the rocker arm is easy to generate eccentric wear with other parts in an engine, so that the shaft is subjected to eccentric wear. And the longer the cantilever structure is, the worse the overall strength of the rocker arm assembly of the engine is, which is not favorable for the design of a high-power-density diesel engine.

2) The rocker arms are arranged on two sides of the rocker arm seat, when the rocker arm seat is mounted on the cylinder cover through bolts, the rocker arm seat is located between the rocker arms, so that the rocker arm seat occupies the central area space of the cylinder cover, the arrangement of an oil injector or an ignition plug is affected, and the rocker arm seat is blocked, so that the rocker arm structure is complex. In a high-power-efficiency high-density compact engine, such as a V-shaped engine with a single camshaft structure, the distance between push rods for driving an air inlet and exhaust rocker arm of each cylinder is reduced due to the limitation of structural size, so that the distance between driving sides of the rocker arms is smaller and smaller, and the arrangement of the rocker arms with the traditional cantilever structure is difficult. In addition, as the distance between the driving sides of the rocker arms is smaller and smaller, the arrangement space of the middle rocker arm seat is limited, the specification and the number of mounting bolts are limited, and the strength and the reliability of the whole mechanism are influenced.

3) In the prior art, a rocker shaft and a rocker seat are in interference assembly, the rocker shaft needs to be shrunk at low temperature and then is installed in a rocker seat hole during installation, a special tool is needed to position and limit the rocker shaft, the experience of installation operators and the tool precision can influence the installation quality of the rocker shaft, the dislocation of the rocker shaft during installation or use can influence the lubricating oil supply, the lubrication of a rocker kinematic pair is not facilitated, the poor lubrication of the rocker arm can cause the clamping stagnation of a gas distribution system, and the opening and closing of a valve are influenced, so that the performance of an engine is influenced.

The applicant has found, after research, that at least one of the problems of the prior art engine rocker arm assemblies described above can be solved by changing the connection mode of the rocker arm between the rocker arm seats and designing the engine rocker arm assembly with a reasonable configuration.

In accordance with some embodiments of the present application, in one aspect, an engine rocker arm assembly is provided. Referring to fig. 1 and 2, fig. 1 is a perspective view of an engine rocker arm assembly according to some embodiments of the present disclosure, and fig. 2 is an exploded view of an engine rocker arm assembly according to some embodiments of the present disclosure. The engine rocker arm assembly comprises a rocker arm seat 1, a connecting part 2 and a rocker arm. Rocker arm seat 1 includes first pedestal 11 and second pedestal 12, and connecting portion 2 connects first pedestal 11 and second pedestal 12, and the rocking arm includes air intake rocker arm 3 and exhaust rocker arm 4, and air intake rocker arm 3 and exhaust rocker arm 4 rotationally set up respectively on connecting portion 2.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated.

The rocker arm seat 1 is a support member in an engine rocker arm assembly for connection with a cylinder head in an engine so as to support an intake rocker arm 3 and an exhaust rocker arm 4 disposed thereon above the cylinder head.

The connecting part 2 is disposed between the first seat 11 and the second seat 12, and is used for connecting the two as a whole. At the same time, the connecting portion 2 also serves as a member for supporting the intake rocker arm 3 and the exhaust rocker arm 4 in the engine rocker arm assembly. In configuration, the connecting portion 2 may have any suitable shape, such as a rib, a shaft, and the like.

The intake rocker arm 3 and the exhaust rocker arm 4 are respectively provided corresponding to valves in the engine, and are respectively rotatably provided so as to open and close the valves in the engine during rotation. The connecting portion 2 has an extending direction from the first seat 11 toward the second seat 12, and the intake rocker arm 3 and the exhaust rocker arm 4 provided on the connecting portion 2 are respectively rotatable about the extending direction of the connecting portion 2 as a rotation axis.

In the rocker arm assembly of the engine, the intake rocker arm 3 and the exhaust rocker arm 4 are respectively arranged on the connecting portion 2 between the first seat 11 and the second seat 12, so that the intake rocker arm 3 and the exhaust rocker arm 4 are arranged between the first seat 11 and the second seat 12. After the engine rocker arm assembly is installed on an engine, the engine rocker arm assembly can avoid the central area of a cylinder cover, so that arrangement of an oil injector/a spark plug is facilitated. Meanwhile, the arrangement scheme of the middle rocker arm and the side rocker arm seat is beneficial to arrangement of the rocker arm component in a small space, and the first seat body 11 and the second seat body 12 are respectively supported on two sides, so that the strength and the reliability of the mechanism can be improved.

The engine rocker arm assembly with the structure is easy to realize a high-strength and high-density engine, such as a V-shaped engine with a single camshaft structure, meets the requirement on compact design of the rocker arm, and simultaneously improves the strength and reliability of the rocker arm assembly.

According to some embodiments of the present application, please refer to fig. 1 and 2, the connecting portion 2 has a shaft section 21, and the intake rocker arm 3 and the exhaust rocker arm 4 are respectively assembled on the shaft section 21 in a clearance fit manner and are respectively rotatable with an axial direction of the shaft section 21 as a rotation center.

The shaft segment 21 is a segment of the connecting portion 2 having a shaft-like outer shape, and the axial direction of the shaft segment 21 is the extending direction of the connecting portion 2 as described above.

The intake rocker arm 3 and the exhaust rocker arm 4 are sleeved on the periphery of the shaft section 21, and a gap exists between the intake rocker arm 3 and the exhaust rocker arm 4 and the periphery of the shaft section 21, and the intake rocker arm 3 and the exhaust rocker arm 4 are in clearance fit with the shaft section 21 so as to allow the intake rocker arm 3 and the exhaust rocker arm 4 to rotate respectively.

The mode that the shaft section 21 allows the air inlet rocker arm 3 and the air outlet rocker arm 4 to rotate is easy to realize, and the assembly process is simple and convenient. Of course, in other embodiments than the embodiment shown in the figures, the intake rocker arm 3 and/or the exhaust rocker arm 4 may be mounted on the connecting portion by other structures, such as by means of bearings or hinges.

According to some embodiments of the present application, please refer to fig. 1 and fig. 2, and further refer to fig. 3, fig. 3 is a schematic cross-sectional view of an engine rocker arm assembly according to some embodiments of the present application, a first oil channel 10 is respectively opened in the rocker arm base 1 and the connecting portion 2, the first oil channel 10 has an oil inlet 101 and an oil outlet 102, the first oil channel 10 is communicated with the outside through the oil inlet 101, and the oil outlet 102 is disposed at a junction of the rocker arm and the connecting portion 2.

The first oil passage 10 allows oil to flow therein, thereby lubricating the motion of the rocker arm assembly of the engine.

In the embodiment shown in the figures, the first oil passage 10 comprises a first section 103, a second section 104 and a third section 105, the first section 103 and the third section 105 respectively extending in the height direction h of the engine rocker arm assembly, and the second section 104 extending in the width direction w of the engine rocker arm assembly. The first section 103 is opened in the rocker arm base 1 and the connecting portion 2, respectively, the second section 104 is opened in the connecting portion 2 and communicates with the first section 103, and passes through the inner sides of the intake rocker arm 3 and the exhaust rocker arm 4 in the width direction w, and the third section 105 has an oil outlet 102. The oil outlet 102 corresponds to the connection between the intake rocker arm 3 and the exhaust rocker arm 4 and the connecting portion 2, respectively, so that the third section 105 communicates the second section 104 with the inside of the intake rocker arm 3 and communicates the second section 104 with the inside of the exhaust rocker arm 4, respectively. First section 103 has an oil inlet 101, and oil inlet 101 is provided at the bottom of rocker arm carrier 1 to allow lubricating oil to enter from the bottom of rocker arm carrier 1 and flow in the direction indicated by arrow a to the inside of intake rocker arm 3 and exhaust rocker arm 4 for lubrication. For convenience of processing, the second segment 104 is a through hole passing through the connecting portion 2 and is blocked by the plug 22.

It is understood that the arrangement of the first lubricating oil passage 10 in the rocker arm seat 1 and the connecting portion 2 and the arrangement position of the oil inlet 101 are not limited to the embodiment shown in fig. 3.

Lubricating oil is reasonably distributed in the rocker arm seat 1 and the connecting part 2, so that lubrication can be conveniently realized in the actuating process of the air inlet rocker arm 3 and the air outlet rocker arm 4.

According to some embodiments of the present application, please refer to fig. 1 to 3, a bushing 5 is further disposed between the rocker arm and the connecting portion 2, the intake rocker arm 3 and the exhaust rocker arm 4 have inner holes 30 and 40, respectively, and the bushing 5 is assembled on the shaft section 21 in a clearance fit manner after being fixedly connected to the inner holes 30 and 40.

With continued reference to fig. 4, fig. 4 is a schematic perspective view of a liner according to some embodiments of the present application, the liner 5 having an annular groove 50 on an inner periphery thereof, the annular groove 50 having a through hole 51 therein, the through hole 51 communicating the annular groove 50 with the inner bores 30, 40, the annular groove 50 communicating with the oil outlet 102 in an assembled state.

When the rocker arm assembly is assembled, the oil flows to the oil outlet 102, flows into the annular groove 50, and then flows along the annular groove 50. The through hole 51 communicates the ring groove 50 and the inner holes 30 and 40 on the outer periphery of the bush 5, so that the lubricating oil flowing along the ring groove 50 can flow to the inner holes 30 and 40 of the intake rocker arm 3 and the exhaust rocker arm 4, respectively, for lubrication.

In a specific embodiment, the through holes 51 are plural along the ring groove 50, thereby enhancing the lubrication efficiency.

By providing the bush 5, it is possible to facilitate mounting of the intake rocker arm 3 and the exhaust rocker arm 4 on the shaft section 21, while reducing wear on the rocker shaft during actuation. Through setting up annular 50 and through-hole 51 structure, be convenient for still can carry out the fuel feeding to air intake rocker arm 3 and exhaust rocker arm 4 at the rotation in-process, improve lubricated efficiency.

In other embodiments different from those shown in the figures, the bushing 5 is not arranged between the rocker arm and the connecting part 2, but an annular groove with the same configuration as the inner periphery of the bushing is arranged in the inner hole of the rocker arm to realize oil supply during rotation.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

As according to some embodiments of the present application, the bushing 5 is interference fit into the bores 30, 40 without providing additional components to assemble, making the installation process simple.

Referring to fig. 1 to 3 and with continued reference to fig. 5, fig. 5 is a schematic cross-sectional view of an intake rocker arm according to some embodiments of the present application, and a second oil passage is further provided in the intake rocker arm 3 and/or the exhaust rocker arm 4, and one end of the second oil passage communicates with the first oil passage 10, and the other end extends to an end of the intake rocker arm 3 and/or the exhaust rocker arm 4.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone.

Taking fig. 5 as an example, for the intake rocker arm 3, the second oil passage extends to both ends of the intake rocker arm 3, respectively, and is denoted by reference numerals 31, 32. The second oil passages 31 and 32 are respectively communicated with the first oil passage 10, and specifically, the second oil passages 31 and 32 are respectively communicated with the first oil passage 10 through the annular groove 50 and the through hole 51 of the bushing 5, so that the oil can flow from the first oil passage 10 to both ends of the intake rocker arm 3 through the second oil passages 31 and 32 along arrow b in the figure. It is understood that the second oil passage provided in the exhaust rocker arm 4 may have the same configuration as the intake rocker arm, and will not be described in detail herein.

By providing the second lubricating oil passage, lubricating oil can be delivered to the two ends of the rocker arm for lubricating components at the two ends of the rocker arm, such as the rocker arm/push rod and the rocker arm/valve bridge kinematic pair, and reliable lubrication is provided for the rocker arm/push rod and the rocker arm/valve bridge kinematic pair.

According to some embodiments of the present application, please refer to fig. 1 to 3, the shaft section 21 has a clamping groove 210 therein, a snap ring 211 is disposed in the clamping groove 210, and the snap ring 211 is clamped in the clamping groove 210 for limiting the movement of the intake rocker arm 3 and the exhaust rocker arm 4 along the axial direction.

Carry out spacing mode through setting up snap ring 211, easily the assembly realizes.

In some embodiments, a gasket 212 is further arranged between the snap ring 211 and the intake rocker arm 3 and/or the exhaust rocker arm 4 to further improve the stability of the axial limiting.

According to some embodiments of the present application, please refer to fig. 1 to 3, the connecting portion 2 is fixedly connected to the first seat 11 and the second seat 12 by fasteners 9, respectively. In a particular embodiment, the fasteners 9 are bolts.

Connecting portion 2 passes through fastener 9 to be installed at rocker arm seat 1, has reduced the installation degree of difficulty of connecting portion 2 and has improved assembly efficiency on the one hand, and on the other hand, because first section 103 in first lubricating oil passageway 10 has the part that sets up respectively in rocker arm seat 1 and connecting portion 2, connects through fastener 9 and can avoid connecting portion 2 because of the aversion of assembly or during operation leads to phenomena such as oil duct compensation, each part lubrication is bad and wearing and tearing aggravation.

In another aspect, according to some embodiments of the present application, there is also provided a diesel engine comprising an engine rocker arm assembly as in one or more of the previous embodiments, the rocker arm carrier 1 being mounted on a cylinder head of the diesel engine. Specifically, the rocker arm seat 1 is mounted on a cylinder cover of the diesel engine through a fastener, and the mounting through the fastener can simplify the assembly process and is easy to realize.

When the rocker arm assembly and the diesel engine described in one or more of the above embodiments are assembled, the bushing 5 is interference-fitted into the inner holes 30 and 40 of the intake rocker arm 3 and the exhaust rocker arm 4, then the above parts are clearance-fitted onto the shaft section 21, then the spacers 212 are inserted into the connecting portion 2 from both ends thereof, and respectively abut against the outer end surfaces of the intake rocker arm 3 and the exhaust rocker arm 4, and then the snap rings 211 are respectively snapped into the snap grooves 210 on both sides of the shaft section 21, so as to axially limit the intake rocker arm 3 and the exhaust rocker arm 4. Then, the plugs 22 are installed at two ends of the connecting part 2, the connecting part 2 is fixed on the rocker arm base 1 by using the fasteners 9, and finally the rocker arm base 1 is fixed on the cylinder cover by using the fasteners.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (9)

1. An engine rocker arm assembly, comprising:

the rocker arm seat comprises a first seat body and a second seat body;

the connecting part is used for connecting the first seat body and the second seat body; and

and the rocker arm comprises an air inlet rocker arm and an air outlet rocker arm, and the air inlet rocker arm and the air outlet rocker arm are respectively and rotatably arranged on the connecting part.

2. The engine rocker arm assembly of claim 1 wherein the connecting portion has a shaft section, and the intake rocker arm and the exhaust rocker arm are each fitted with a clearance fit on the shaft section and are each rotatable about an axis of the shaft section.

3. The engine rocker arm assembly of claim 2, wherein the rocker arm base and the connecting portion each define a first oil passage, the first oil passage having an oil inlet and an oil outlet, the first oil passage communicating with the outside through the oil inlet, and the oil outlet being disposed at a junction of the rocker arm and the connecting portion.

4. The engine rocker arm assembly of claim 3, further comprising a bushing disposed between the rocker arm and the connecting portion, the intake rocker arm and the exhaust rocker arm each having an inner bore, the bushing being fixedly attached to the inner bore and being loosely fitted over the shaft segment;

the inner periphery of the bushing is provided with a ring groove, a through hole is formed in the ring groove, the ring groove is communicated with the inner hole through the through hole, and the ring groove is communicated with the oil outlet in an assembling state.

5. The engine rocker arm assembly of claim 4 wherein the bushing is fitted in the bore with an interference fit.

6. The engine rocker arm assembly of claim 3, wherein a second oil passage is further provided in the intake rocker arm and/or the exhaust rocker arm, the second oil passage having one end in communication with the first oil passage and another end extending to an end of the intake rocker arm and/or the exhaust rocker arm.

7. The engine rocker arm assembly of claim 2 wherein the shaft segment has a snap groove therein, the snap groove having a snap ring disposed therein for limiting movement of the intake rocker arm and the exhaust rocker arm in the axial direction.

8. The engine rocker arm assembly of claim 1 wherein the connecting portion is fixedly coupled to the first and second seats, respectively, by fasteners.

9. A diesel engine including an engine rocker arm assembly as claimed in any one of claims 1 to 8, the rocker arm carrier being mounted on a cylinder head of the diesel engine.

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