阅读说明：本技术 用于配气系统的油道结构和配气系统 (Oil passage structure for gas distribution system and gas distribution system ) 是由 张文德 朱亭诺 张志文 王照坤 于 2018-08-24 设计创作，主要内容包括：本公开涉及一种用于配气系统的油道结构和配气系统,所述配气系统包括摇臂、凸轮、液压挺柱和气门,所述液压挺柱和所述气门分别抵接在所述摇臂的两端,所述摇臂上活动地设置有与所述凸轮抵接的滚子,所述凸轮驱动所述滚子以使得所述摇臂围绕所述液压挺柱转动,其中,所述油道结构包括设置在所述摇臂内的润滑油道,该润滑油道包括用于润滑所述滚子的第一润滑油道和/或用于润滑所述气门和所述摇臂的抵接点的第二润滑油道。本润滑油道主要针对配气系统中的气门和摇臂以及滚轮与凸轮的摩擦结合面进行有效润滑,保证整个配气系统的工作精度和可靠性。(The present disclosure relates to an oil duct structure for a valve train and a valve train, the valve train including a rocker arm, a cam, a hydraulic tappet and a valve, the hydraulic tappet and the valve respectively abutting against two ends of the rocker arm, the rocker arm being movably provided with a roller abutting against the cam, the cam driving the roller to rotate the rocker arm around the hydraulic tappet, wherein the oil duct structure includes a lubrication oil duct provided in the rocker arm, the lubrication oil duct including a first lubrication oil duct for lubricating the roller and/or a second lubrication oil duct for lubricating the valve and an abutting point of the rocker arm. The lubricating oil passage is mainly used for effectively lubricating a valve, a rocker arm and a friction joint surface of a roller and a cam in the gas distribution system, and the working precision and reliability of the whole gas distribution system are ensured.)

1. An oil passage structure for a valve train system, the valve train system comprising a rocker arm (1), a cam, a hydraulic tappet (2) and a valve (3), the hydraulic tappet (2) and the valve (3) being respectively abutted against two ends of the rocker arm (1), a roller (4) abutted against the cam being movably provided on the rocker arm (1), the cam driving the roller (4) to make the rocker arm (1) swing around the hydraulic tappet (2), characterized in that the oil passage structure comprises a lubricating oil passage (5) provided in the rocker arm (1), the lubricating oil passage (5) comprising a first lubricating oil passage (51) for lubricating the roller (4) and/or a second lubricating oil passage (52) for lubricating an abutment point of the valve (3) and the rocker arm (1).

2. The oil gallery structure according to claim 1, wherein the rocker arm (1) includes a frame (11), the roller (4) is rotatably connected to the frame (11), one end of the frame (11) is provided with a mounting portion (12) for mounting the hydraulic lifter (2), the other end is provided with a head pressing portion (13) for pressing the valve (3), the first and second oil passages (51, 52) are provided in the mounting portion (12) at a parallel interval, the first oil passage (51) extends toward the roller (4), and the second oil passage (52) is located below the roller (4) and extends toward a lower end of the head pressing portion (13).

3. The oil passage structure according to claim 1 or 2, characterized in that the oil passage structure further includes a supply oil passage for supplying oil to the lubricating oil passage (5), which is provided inside the hydraulic lifter (2), and the first lubricating oil passage (51) and/or the second lubricating oil passage (52) communicate with the supply oil passage.

4. The oil passage structure according to claim 3, wherein the hydraulic tappet (2) includes a housing (21) provided on the engine cylinder head (6) and a cylinder (22) provided in an inner cavity (210) of the housing (21), one end of the rocker arm (1) is formed with a groove (121) cooperatively connected with an upper end of the cylinder (22), wherein a hydraulic oil passage (7) is formed inside the cylinder (22), the engine cylinder head (6) is formed with a high pressure oil passage (8) communicated with the hydraulic oil passage (7), the hydraulic oil passage (7) is formed with a partition plate (71), the partition plate (71) divides the hydraulic oil passage (7) into an upper hydraulic oil passage (72) and a lower hydraulic oil passage (73), the upper hydraulic oil passage (72) forms the supply oil passage and is communicated with the groove (121), and the second lubricating oil passage (52) is communicated with the upper hydraulic oil passage (72) through the groove (121), and is communicated with the first lubricating oil channel (51) through a communication oil channel (53), and a lower oil port (732) communicated with the inner cavity (210) is formed on the bottom wall (731) of the lower hydraulic oil channel (73).

5. The oil passage structure according to claim 4, characterized in that a first upper oil inlet hole (10) communicating with the upper hydraulic oil passage (72) and a first lower oil inlet hole (20) communicating with the lower hydraulic oil passage (73) are formed in the cylinder (22), and correspondingly, a second upper oil inlet hole (30) and a second lower oil inlet hole (40) communicating with the first upper oil inlet hole (10) and the first lower oil inlet hole (20), respectively, in one-to-one correspondence are formed in the housing (21), and the high-pressure oil passage (8) includes an upper oil passage (81) and a lower oil passage (82), the upper oil passage (81) being connected to the second upper oil inlet hole (30) to communicate with the upper hydraulic oil passage (72), and the lower oil passage (82) being connected to the second lower oil inlet hole (40) to communicate with the lower hydraulic oil passage (73).

6. The oil passage structure according to claim 5, characterized in that a first upper annular oil groove (221) and a first lower annular oil groove (222) are formed on the outer surface of the cylinder (22), correspondingly, a second upper annular oil groove (211) and a second lower annular oil groove (212) are formed on the outer surface of the housing (21), a plurality of the first upper oil inlet holes (10) and a plurality of the second upper oil inlet holes (30) are respectively provided at uniform intervals in the circumferential directions of the first upper annular oil groove (221) and the second upper annular oil groove (211), respectively, and a plurality of the first lower oil inlet holes (20) and a plurality of the second lower oil inlet holes (40) are respectively provided at uniform intervals in the circumferential directions of the first lower annular oil groove (221) and the second lower annular oil groove (212), respectively, at uniform intervals.

7. The oil passage structure according to claim 5, wherein an annular oil outlet groove (223) is further formed on an outer surface of an upper end of the cylinder (22) engaged with the groove (121), and the annular oil outlet groove (223) is opened with a plurality of oil outlet holes (50) communicating with the groove (121) along a circumferential direction thereof to communicate the upper hydraulic oil passage (72) with the second oil passage (52).

8. The oil passage structure according to claim 4, characterized in that the communication oil passage (53) extends from the upper end of the rocker arm (1) downward through the first lubricating oil passage (51) to the second lubricating oil passage (52), and the upper end of the communication oil passage (53) is provided with a sealing plug (9).

9. The oil passage structure according to claim 4, characterized in that the upper end of the cylinder (22) is formed as a spherical protrusion (220), and correspondingly, the groove (121) is formed as a spherical groove with the spherical protrusion (220).

10. An air distribution system characterized by comprising the oil passage structure for an air distribution system according to any one of claims 1 to 9.

Technical Field

The disclosure relates to the field of engine gas distribution, in particular to an oil passage structure for a gas distribution system and the gas distribution system.

Background

The valve system of the engine comprises a tappet, a rocker arm, a valve and a cam, wherein the rocker arm takes the hydraulic tappet as a fulcrum, is pressed on a roller of the rocker arm through the cam, and drives the rocker arm to rotate around the hydraulic tappet so as to realize the low-pressure valve at the other end of the rocker arm, so that the valve does reciprocating motion in a valve guide pipe and the change of the valve lift is realized. In order to avoid the influence of the abrasion among all parts on the working precision of the system, in the prior art generally, the joint surfaces of all parts are lubricated by lubricating oil generated by the rotation of the cam, the lubricating oil generated by the rotation of the cam is too dispersed, the effective lubricating oil is too little, and particularly, the friction position of the cam and the roller and the friction position of the valve and the rocker arm are also changed all the time, so that the poor lubrication is caused, and the abrasion of each joint surface of the gas distribution system is relatively serious.

Disclosure of Invention

The purpose of the disclosure is to provide an oil passage structure for a gas distribution system, which has a simple structure and a good lubricating effect.

In order to achieve the above object, the present disclosure provides an oil passage structure for an air distribution system, where the air distribution system includes a rocker arm, a cam, a hydraulic tappet and a valve, the hydraulic tappet and the valve are respectively abutted to two ends of the rocker arm, a roller abutted to the cam is movably disposed on the rocker arm, and the cam drives the roller to rotate the rocker arm around the hydraulic tappet, where the oil passage structure includes a lubricating oil passage disposed in the rocker arm, and the lubricating oil passage includes a first lubricating oil passage for lubricating the roller and/or a second lubricating oil passage for lubricating an abutting point of the valve and the rocker arm.

Optionally, the rocker arm includes a frame, the roller is rotatably connected to the inside of the frame, one end of the frame is provided with a mounting portion for mounting the hydraulic tappet, the other end of the frame is provided with a pressure head portion for abutting against the valve, the first lubricating oil passage and the second lubricating oil passage are arranged in the mounting portion at intervals in parallel, the first lubricating oil passage extends toward the roller, and the second lubricating oil passage is located below the roller and extends toward a lower end of the pressure head portion.

Optionally, the oil passage structure further includes a supply oil passage for supplying oil to the lubricating oil passage, the supply oil passage is disposed inside the hydraulic tappet, and the first lubricating oil passage and/or the second lubricating oil passage are communicated with the supply oil passage through the groove.

Optionally, the hydraulic tappet includes a housing disposed on the engine cylinder head and a cylinder disposed in an inner cavity of the housing, a groove cooperatively connected with an upper end of the cylinder is formed at one end of the rocker arm, a hydraulic oil passage is formed inside the cylinder, a high-pressure oil passage communicated with the hydraulic oil passage is formed on the engine cylinder head, a partition plate is formed in the hydraulic oil passage, the hydraulic oil passage is divided into an upper hydraulic oil passage and a lower hydraulic oil passage by the partition plate, the upper hydraulic oil passage forms the supply oil passage and is communicated with the groove, the second lubricating oil passage passes through the groove and is communicated with the upper hydraulic oil passage and is communicated with the first lubricating oil passage through the oil passage, and a lower oil port communicated with the inner cavity is formed at a bottom wall of the lower hydraulic oil passage.

Optionally, a first upper oil inlet communicated with the upper hydraulic oil passage and a first lower oil inlet communicated with the lower hydraulic oil passage are formed in the cylinder, correspondingly, a second upper oil inlet and a second lower oil inlet communicated with the first upper oil inlet and the first lower oil inlet in a one-to-one correspondence manner are formed in the casing, the high-pressure oil passage includes an upper oil passage and a lower oil passage, the upper oil passage is connected to the second upper oil inlet to be communicated to the upper hydraulic oil passage, and the lower oil passage is connected to the second lower oil inlet to be communicated to the lower hydraulic oil passage.

Optionally, be formed with annular oil groove on the surface of cylinder and first annular oil groove down, correspondingly, the surface of casing is formed with annular oil groove on the second and annular oil groove under the second, annular oil groove on the first and annular groove on the second circumference respectively one-to-one evenly spaced set up a plurality ofly oil inlet hole and a plurality of are gone up to the second in the first oil inlet hole and a plurality of are gone up to the circumference of annular groove under the first annular oil groove and the second the circumference of annular groove respectively one-to-one evenly spaced set up a plurality ofly oil inlet hole and a plurality of are gone down to the second.

Optionally, an annular oil outlet groove is further formed in the outer surface of the upper end, where the cylinder is matched with the groove, and a plurality of oil outlet holes communicated with the groove are formed in the annular oil outlet groove along the circumferential direction of the annular oil outlet groove, so that the upper hydraulic oil duct is communicated with the second lubricating oil duct.

Optionally, the communication oil passage extends from the upper end of the rocker arm to the second lubricating oil passage through the first lubricating oil passage towards the lower part, and a sealing plug is arranged at the upper end of the communication oil passage.

Alternatively, the upper end of the cylinder is formed as a spherical projection, and correspondingly, the groove is formed as a spherical groove with the spherical projection.

According to another aspect of the present disclosure, an air distribution system is further provided, which includes the above-disclosed oil passage structure for an air distribution system.

The beneficial effect of this technique is: when the cam drives the roller to rotate to generate friction, the first lubricating oil channel can provide lubricating oil to the roller, and the abrasion between the roller and the cam is effectively improved; and the second lubricating oil duct can be towards the direct fuel feeding of the butt point of valve and rocking arm, can be fast, effectual improvement valve and the wearing and tearing between the rocking arm. The lubricating oil passage is mainly used for effectively lubricating a valve, a rocker arm and a friction joint surface of a roller and a cam in the gas distribution system, and the working precision and reliability of the whole gas distribution system are ensured.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a cross-sectional view of a gas distribution system provided by the present disclosure;

FIG. 2 is a top view of a rocker arm provided by the present disclosure;

FIG. 3 is a longitudinal cross-sectional view of a rocker arm provided by the present disclosure;

FIG. 4 is a cross-sectional view of a hydraulic lifter provided by the present disclosure;

FIG. 5 is a cross-sectional view of the assembly of a hydraulic lifter and engine cylinder head provided by the present disclosure;

FIG. 6 is an exploded view of components of a gas distribution system provided by the present disclosure;

fig. 7 is an assembly view of a valve train provided by the present disclosure (without a cam).

Description of the reference numerals

1-rocker arm, 11-frame, 12-mount, 121-recess, 13-ram, 2-hydraulic tappet, 21-housing, 210-lumen, 211-second upper annular oil groove, 212-second lower annular oil groove, 22-cylinder, 220-spherical protrusion, 221-first upper annular oil groove, 222-first lower annular oil groove, 223-annular oil outlet groove, 3-valve, 4-roller, 5-oil gallery, 51-first oil gallery, 52-second oil gallery, 53-communicating oil gallery, 6-engine cylinder cover, 7-hydraulic oil gallery, 71-partition, 72-upper hydraulic oil gallery, 73-lower hydraulic oil gallery, 731-bottom wall, 732-lower oil port, 8-high pressure oil gallery, 81-upper oil gallery, 82-lower oil gallery, 9-sealing plug, 10-first upper oil inlet hole, 20-first lower oil inlet hole, 30-second upper oil inlet hole, 40-second lower oil inlet hole, 50-oil outlet hole.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, where not otherwise stated, use of the terms of orientation such as "upper and lower" generally means that the end of the hydraulic lifter proximate the rocker arm is up and the end distal from the rocker arm is down, and "inner and outer" are defined for the inner and outer of the profile of the components.

As shown in fig. 1 to 7, the present disclosure provides an oil passage structure for a valve train including a rocker arm 1, a cam, a hydraulic tappet 2 and a valve 3, the hydraulic tappet 2 and the valve 3 respectively abut against both ends of the rocker arm 1, a roller 4 abutting against the cam is movably disposed on the rocker arm 1, and the cam drives the rocker arm 1 to swing the rocker arm 1 around the hydraulic tappet 2, wherein the oil passage structure includes a lubricating oil passage 5 disposed in the rocker arm 1, and the lubricating oil passage 5 includes a first lubricating oil passage 51 for lubricating the roller 4 and/or a second lubricating oil passage 52 for lubricating an abutting point of the valve 3 and the rocker arm 1.

Namely, a lubricating oil passage is arranged inside the rocker arm 1, so that self-lubrication is realized. The first lubricating oil passage 51 can supply lubricating oil toward the roller 4, effectively improving the abrasion between the roller 4 and the cam, particularly when the cam-driven roller 4 rotates to generate friction; and the second lubricating oil channel 52 can directly supply oil to the abutting point of the valve 3 and the rocker arm 1, so that the abrasion between the valve 3 and the rocker arm 1 can be quickly and effectively improved. The lubricating oil duct 5 effectively lubricates a friction joint surface in the gas distribution system, and ensures the working precision and reliability of the whole gas distribution system.

Specifically, as shown in fig. 2 and 3, in the present embodiment, the rocker arm 1 includes a frame 11, a roller 4 is rotatably attached to the inside of the frame 11, one end of the frame 11 is provided with a mounting portion 12 for mounting the hydraulic lifter 2, the other end is provided with a head portion 13 for pressing the valve 3, a first lubricating oil passage 51 and a second lubricating oil passage 52 are provided in the mounting portion 12 at a parallel interval, the first lubricating oil passage 51 extends toward the roller 4, and the second lubricating oil passage 52 is located below the roller 4 and extends toward the lower end of the head portion 13.

That is, in order to ensure effective lubrication of the contact point of the roller 4 and the cam, the position of the first lubricating oil passage 51 is within the range of the diameter of the roller 4, and it can be ensured that the oil jet is always directed toward the roller 4; in order to prevent the roller 4 from blocking the second lubricating oil channel 52, the second lubricating oil channel 52 is lower than the roller 4 and has the same height as the abutting point of the pressure head part 13 and the valve 3, and because the second lubricating oil channel 52 can move along with the rocker arm 1, the position of the injection port of the second lubricating oil channel 52 relative to the point to be lubricated (namely the abutting point of the pressure head part and the valve) can be ensured to be fixed, so that continuous lubrication can be ensured.

As shown in fig. 1, in the present embodiment, the oil passage structure further includes a supply oil passage for supplying oil to the lubricating oil passage 5, which is provided inside the hydraulic tappet 2, and the first lubricating oil passage 51 and/or the second lubricating oil passage 52 communicate with the supply oil passage through the groove 121. That is, the hydraulic lifter 2 serves as an oil supply body, and is responsible for supplying the lubricating oil passage 5 with lubricating oil through the supply oil passage.

Specifically, as shown in fig. 5, in the present embodiment, the hydraulic tappet 2 includes a housing 21 provided on the engine cylinder head 6 and a cylinder 22 provided in an inner cavity 210 of the housing 21, one end of the rocker arm 1 is formed with a groove 121 cooperatively connected with an upper end of the cylinder 22, wherein a hydraulic oil passage 7 is formed inside the cylinder 22, a high-pressure oil passage 8 communicating with the hydraulic oil passage 7 is formed on the engine cylinder head 6, a partition plate 71 is formed in the hydraulic oil passage 7, the partition plate 71 divides the hydraulic oil passage 7 into an upper hydraulic oil passage 72 and a lower hydraulic oil passage 73, the upper hydraulic oil passage 72 forms a supply oil passage and communicates with the groove 121, a second lubricating oil passage 52 communicates with the upper hydraulic oil passage 72 through the groove 121 and communicates with the first lubricating oil passage 51 through the communication oil passage 53, and a lower oil port 732 communicates with the inner cavity 210 is formed in a bottom wall 731 of the lower hydraulic oil passage 73.

That is, the high-pressure oil passage 8 in the engine head 6 supplies high-pressure lubricating oil toward the hydraulic oil passage 7. In the working process, the high-pressure oil duct 8 supplies lubricating oil to the upper hydraulic oil duct 72 and the lower hydraulic oil duct 73 respectively, wherein the upper hydraulic oil duct 72 defines the supply oil duct and is responsible for leading the lubricating oil in the high-pressure oil duct 8 to the second lubricating oil duct 52 through the groove 121, the second lubricating oil duct 52 sprays the lubricating oil from the oil injection port to the abutting point between the valve 3 and the rocker arm 1 on one hand, and on the other hand, continuously high-pressure oil is conducted into the first lubricating oil duct 51 through the communication oil duct 53, so that the first lubricating oil duct 51 sprays the high-pressure oil to the roller 4 for lubrication. The lower oil gallery 73 introduces the lubricating oil into the inner cavity 210 of the housing 21 through the lower oil port 721, and changes the working length of the cylinder 22 through the change of the internal oil pressure, thereby performing the function of automatically adjusting the valve clearance.

In other words, the present hydraulic tappet 2 constitutes a supply oil passage through the upper hydraulic oil passage 72 for lubricating the rocker arm 1 and the valve 3; the function of adjusting the valve clearance is achieved by the lower hydraulic gallery 73.

More specifically, in order to communicate the high-pressure oil passage 8 with the hydraulic oil passage 7, in the present embodiment, the cylinder 22 is formed with a first upper oil inlet hole 10 communicating with the upper hydraulic oil passage 72 and a first lower oil inlet hole 20 communicating with the lower hydraulic oil passage 73, and accordingly, the housing 21 is formed with a second upper oil inlet hole 30 and a second lower oil inlet hole 40 communicating with the first upper oil inlet hole 10 and the first lower oil inlet hole 20, respectively, in one-to-one correspondence, and in order to simultaneously supply oil to the upper hydraulic oil passage 72 and the lower hydraulic oil passage 73, the high-pressure oil passage 8 includes an upper oil passage 81 and a lower oil passage 82, the upper oil passage 81 is connected to the second upper oil inlet hole 30 to communicate with the upper hydraulic oil passage 72, and the lower oil passage 82 is connected to the second lower oil inlet hole 40 to communicate with the.

Thus, the lubricating oil in the upper oil gallery 81 passes through the second upper oil feed hole 30 and the first upper oil feed hole 10 in order, and enters the upper hydraulic oil gallery 72; likewise, the lubricating oil in the lower oil gallery 82 enters the lower hydraulic oil gallery 73 sequentially through the first lower oil inlet hole 20 and the second lower oil inlet hole 40.

In order to facilitate assembly and ensure that the hydraulic tappet 2 can communicate high-pressure lubricating oil under any assembly condition, as shown in fig. 4, in the present embodiment, a first upper annular oil groove 221 and a first lower annular oil groove 222 are formed on the outer surface of the cylinder body 22, correspondingly, a second upper annular oil groove 211 and a second lower annular oil groove 212 are formed on the outer surface of the housing 21, a plurality of first upper oil inlet holes 10 and a plurality of second upper oil inlet holes 30 are respectively and uniformly arranged in a one-to-one correspondence in the circumferential direction of the first upper annular oil groove 221 and the second upper annular oil groove 211, and a plurality of first lower oil inlet holes 20 and a plurality of second lower oil inlet holes 40 are respectively and uniformly arranged in a one-to-one correspondence in the circumferential direction of the first lower annular oil groove 222 and the second lower annular groove 212.

When the upper oil gallery 81 leads the lubricating oil into the upper hydraulic oil gallery 72, the lubricating oil firstly surrounds the second upper annular oil groove 211 on the housing 21, then passes through the second upper oil inlet holes 30, then enters the first upper annular oil groove 221 of the cylinder 22, flows around the first upper annular oil groove 221, finally enters the upper hydraulic oil gallery 72 through the first upper oil inlet holes 10, and is guided into the lubricating oil gallery 5 by the upper hydraulic oil gallery 72. Similarly, the oil passage of the lower hydraulic oil passage 73 is the same as that of the upper hydraulic oil passage 72, and the description thereof is omitted.

Above-mentioned annular oil groove that sets up on casing 21 and cylinder 22 is annular oil duct promptly, high-pressure lubricating oil flows around annular oil duct, finally flow into hydraulic oil duct 7 from corresponding oilhole again, on the one hand, make things convenient for cylinder 22's installation, can guarantee that cylinder 22 can both switch on lubricating oil under any assembly condition, above-mentioned annular oil groove has certain groove width in height simultaneously, can also satisfy cylinder 22 any high intercommunication of high-pressure lubricating oil down, on the other hand, the setting of a plurality of oilholes can conveniently lead to oil fast.

Further, as shown in fig. 1 and 4, in order to guide the lubricating oil in the upper hydraulic oil gallery 72 into the lubricating oil gallery 5, in the present embodiment, an annular oil outlet groove 223 is further formed on the outer surface of the upper end of the cylinder 22, which is fitted into the groove 121, and the annular oil outlet groove 223 is opened along the circumferential direction thereof with a plurality of oil outlet holes 50 for communicating with the groove 121, so as to communicate the upper hydraulic oil gallery 71 with the second lubricating oil gallery 52.

Thus, the oil outlet hole 50 allows the inside and outside of the cylinder 22 to communicate, that is, the upper oil gallery 72 and the groove 121 to communicate, and the lubricating oil of the upper oil gallery 72 flows out of the oil outlet hole 50 and flows around the annular oil outlet groove 223, and finally flows into the second lubricating oil gallery 52. During this flow, the lubricating oil lubricates the space between the upper end of the cylinder 22 and the groove.

To facilitate the machining of the communication oil passage 53, as shown in fig. 1, in the present embodiment, the communication oil passage 53 extends from the upper end of the rocker arm 1 downward through the first lubricating oil passage 51 to the second lubricating oil passage 52. That is, the communication oil passage 53 extends vertically, quickly guides the lubricating oil in the second lubricating oil passage 52 to the first lubricating oil passage 51, and in order to prevent the lubricating oil from being sprayed out of the rocker arm 1, a sealing plug 9 is provided at the upper end of the communication oil passage 53, sealing the communication oil passage 53.

In addition, in order to facilitate the swing arm 1 to rotate around the cylinder 22, in the present embodiment, the upper end of the cylinder 22 is formed as a spherical protrusion 220, and accordingly, the groove 121 is formed as a spherical groove with the spherical protrusion 220. The ball head connection provides multi-angle rotation, so that the rocker arm 1 rotates smoothly, and vibration is reduced.

The present disclosure further provides a gas distribution system, including the above-mentioned disclosed oil duct structure for a gas distribution system. Through the design of oil duct structure, realized gas distribution system's self-lubricating, wherein, lubricating oil duct 5 sets up on rocking arm 1, has further realized guaranteeing gas distribution system's operating accuracy and operational reliability to rocking arm 1 and the lasting effectual lubrication of valve 3.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure. It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.