阅读说明：本技术 摇臂机构及发动机系统 (Rocker arm mechanism and engine system ) 是由 曹中基 陈能舜 俞展亮 姜义泉 周道洋 柯雨辰 于 2019-12-05 设计创作，主要内容包括：本发明涉及发动机技术领域,特别涉及一种摇臂机构及发动机系统。所述摇臂机构,包括摇臂本体、凸轮和制动组件,摇臂本体的一端与凸轮抵接,制动组件设置在摇臂本体的另一端,制动组件包括固定杆和制动活塞,固定杆和制动活塞之间设有第一预留间隙,摇臂本体上设有制动阀和重置阀,制动阀与重置阀之间连通有第一润滑油道和第二润滑油道,制动阀能够将第一润滑油道关闭或打开,重置阀能够将第二润滑油道关闭或打开,重置阀与制动组件之间连通有第三润滑油道；凸轮包括凸轮本体、排气凸起和制动凸起,排气凸起和制动凸起沿凸轮本体圆周方向间隔设置,排气凸起的最大升程大于第一预留间隙,制动凸起的最大升程小于第一预留间隙。(The invention relates to the technical field of engines, in particular to a rocker arm mechanism and an engine system. The rocker arm mechanism comprises a rocker arm body, a cam and a brake assembly, one end of the rocker arm body is abutted to the cam, the brake assembly is arranged at the other end of the rocker arm body and comprises a fixing rod and a brake piston, a first reserved gap is formed between the fixing rod and the brake piston, the rocker arm body is provided with a brake valve and a reset valve, a first lubricating oil channel and a second lubricating oil channel are communicated between the brake valve and the reset valve, the brake valve can close or open the first lubricating oil channel, the reset valve can close or open the second lubricating oil channel, and a third lubricating oil channel is communicated between the reset valve and the brake assembly; the cam comprises a cam body, an exhaust bulge and a braking bulge, wherein the exhaust bulge and the braking bulge are arranged at intervals along the circumferential direction of the cam body, the maximum lift of the exhaust bulge is larger than a first reserved gap, and the maximum lift of the braking bulge is smaller than the first reserved gap.)

1. A rocker arm mechanism comprising: the rocker arm comprises a rocker arm body, a cam and a brake assembly, wherein one end of the rocker arm body is abutted against the cam, the brake assembly is arranged at the other end of the rocker arm body, the brake assembly comprises a fixed rod and a brake piston, a first reserved gap is arranged between the fixed rod and the brake piston, and the brake assembly is characterized in that,

a brake valve and a reset valve are arranged on the rocker arm body, a first lubricating oil channel and a second lubricating oil channel are communicated in parallel between the brake valve and the reset valve, the brake valve closes or opens the first lubricating oil channel, the reset valve closes or opens the second lubricating oil channel, and a third lubricating oil channel is communicated between the reset valve and the brake assembly;

the cam comprises a cam body, an exhaust protrusion and a braking protrusion, the exhaust protrusion and the braking protrusion are arranged at intervals in the circumferential direction of the cam body, the maximum lift range of the exhaust protrusion is larger than the width of the first reserved gap, and the maximum lift range of the braking protrusion is smaller than the width of the first reserved gap.

2. The rocker arm mechanism of claim 1, wherein the rocker arm body is provided with a brake oil passage for communicating with an external pressure oil supply device, the brake oil passage communicates with the brake valve to supply pressure oil to the brake valve, and the brake valve opens the brake oil passage and closes the first oil passage under the action of the pressure oil.

3. The rocker arm mechanism of claim 2, wherein the brake valve includes a brake valve cavity and a piston return both disposed within the brake valve cavity; the top of the brake valve cavity is communicated with the brake oil duct, and the middle of the brake valve cavity is communicated with the first lubricating oil duct and the second lubricating oil duct;

the piston resetting piece is connected between the bottom of the brake valve installation cavity and the bottom of the piston, and when the brake valve is in a free state, the piston resetting piece enables the top of the piston to be abutted against the top of the brake valve cavity and enables a second reserved gap to be formed between the bottom of the piston and the bottom of the brake valve cavity.

4. The rocker arm mechanism of claim 2, wherein the piston is provided with an annular groove in the middle, the brake valve chamber is provided with an oil inlet for the entry of lubricating oil in the middle of one side thereof, the brake valve chamber is provided with a first lubricating oil outlet communicating with the first lubricating oil passage and a second lubricating oil outlet communicating with the second lubricating oil passage in the middle of the other side thereof, and the oil inlet is communicable with the first lubricating oil outlet and/or the second lubricating oil outlet through the annular groove.

5. The rocker mechanism of claim 2, wherein the top end of the plunger is chamfered.

6. The rocker arm mechanism of claim 2, wherein the reset valve includes a first lubricant chamber, a second lubricant chamber, and a valve spool in communication with each other, the first lubricant chamber being in communication with both the first lubricant passage and the third lubricant passage, the second lubricant chamber being in communication with the second lubricant passage, the valve spool being capable of closing the communication of the first lubricant chamber and the second lubricant chamber to close the second lubricant passage.

7. The rocker arm mechanism of claim 6, wherein the first and second chambers are both disposed on the rocker arm body, and the first chamber is disposed through a top of the rocker arm body, the reset valve including a closure disposed at the top of the first chamber to close the top of the first chamber.

8. The rocker arm mechanism of claim 7, wherein the valve spool includes a reset pin, a valve stem, and a valve ball, the reset pin being fixedly disposed outside the rocker arm body, the first oil gallery having a diameter greater than a diameter of the second oil gallery;

one end of the valve ball is connected with the valve rod and clamped at the communication position of the first lubricating oil cavity and the second lubricating oil cavity, and the other end of the valve rod extends out of the second lubricating oil cavity, so that when the rocker arm body is abutted to the exhaust protrusion, the valve rod is abutted to the reset pin.

9. The rocker mechanism of claim 2, wherein the reset valve is disposed between the brake valve and the brake assembly.

10. An engine system, comprising: the rocker mechanism of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of engines, in particular to a rocker arm mechanism and an engine system.

Background

When a vehicle travels downhill, the long-time brake application causes brake overheating, which affects the service life of the brake, and the engine braking technology has been used to assist the braking in the prior art to reduce the damage to the brake. At present, a rocker arm mechanism is provided, which realizes the switching between normal exhaust and auxiliary braking of an engine by additionally adding a cam switching device, and the structure of the rocker arm mechanism is complex.

Disclosure of Invention

The invention aims to provide a rocker arm mechanism and an engine system, and aims to solve the technical problem that the rocker arm mechanism in the prior art is complex in structure.

The invention provides a rocker arm mechanism which comprises a rocker arm body, a cam and a brake assembly, wherein one end of the rocker arm body is abutted against the cam, the brake assembly is arranged at the other end of the rocker arm body and comprises a fixed rod and a brake piston, a first reserved gap is arranged between the fixed rod and the brake piston, a brake valve and a reset valve are arranged on the rocker arm body, a first lubricating oil channel and a second lubricating oil channel are communicated in parallel between the brake valve and the reset valve, the brake valve can close or open the first lubricating oil channel, the reset valve can close or open the second lubricating oil channel, and a third lubricating oil channel is communicated between the reset valve and the brake assembly; the cam comprises a cam body, an exhaust bulge and a braking bulge, wherein the exhaust bulge and the braking bulge are arranged at intervals along the circumferential direction of the cam body, the maximum lift of the exhaust bulge is larger than a first reserved gap, and the maximum lift of the braking bulge is smaller than the first reserved gap.

Furthermore, a brake oil duct used for being communicated with an external pressure oil supply device is arranged on the rocker arm body, the brake oil duct is communicated with the brake valve to convey pressure oil to the brake valve, and the brake valve opens the brake oil duct under the action of the pressure oil and closes the first lubricating oil duct.

Furthermore, the brake valve comprises a brake valve cavity, a piston and a piston resetting piece, wherein the piston and the piston resetting piece are both arranged in the brake valve cavity; the top of the brake valve cavity is communicated with the brake oil duct, and the middle of the brake valve cavity is communicated with the first lubricating oil duct and the second lubricating oil duct;

the piston resetting piece is connected between the bottom of the brake valve installation cavity and the bottom of the piston, and when the brake valve is in a free state, the piston resetting piece enables the top of the piston to be abutted against the top of the brake valve cavity and enables a second reserved gap to be formed between the bottom of the piston and the bottom of the brake valve cavity.

Furthermore, an annular groove is formed in the middle of the piston, an oil inlet used for lubricating oil to enter is formed in the middle of one side of the brake valve cavity, a first lubricating oil outlet communicated with the first lubricating oil channel and a second lubricating oil outlet communicated with the second lubricating oil channel are formed in the middle of the other side of the brake valve cavity, and the oil inlet can be communicated with the first lubricating oil outlet and/or the second lubricating oil outlet through the annular groove.

Further, the top end of the piston is provided with a chamfer.

Further, the reset valve comprises a first lubricating oil cavity, a second lubricating oil cavity and a valve core which are communicated with each other, the first lubricating oil cavity is communicated with the first lubricating oil channel and the third lubricating oil channel, the second lubricating oil cavity is communicated with the second lubricating oil channel, and the valve core can close the communication position of the first lubricating oil cavity and the second lubricating oil cavity to close the second lubricating oil channel.

Further, the first lubricating oil cavity and the second lubricating oil cavity are arranged on the rocker arm body, the first lubricating oil cavity penetrates through the top of the rocker arm body, the reset valve comprises a blocking piece, and the blocking piece is arranged at the top of the first lubricating oil cavity so as to block the top of the first lubricating oil cavity.

Furthermore, the valve core comprises a reset pin, a valve rod and a valve ball, the reset pin is fixedly arranged outside the rocker arm body, and the diameter of the first lubricating oil cavity is larger than that of the second lubricating oil cavity;

one end of the valve ball is connected with the valve rod and clamped at the communicating position of the first lubricating oil cavity and the second lubricating oil cavity, and the other end of the valve rod extends out of the second lubricating oil cavity, so that the valve rod is abutted to the reset pin in the process of abutting the rocker arm body and the exhaust protrusion.

Further, a reset valve is disposed between the brake valve and the brake assembly.

The invention provides an engine system which comprises the rocker arm mechanism.

Compared with the prior art, the invention has the following beneficial effects:

the rocker arm mechanism provided by the invention has the advantages that the exhaust bulge and the brake bulge with different lift ranges are simultaneously arranged on the same cam body, and the normal work of the engine and the auxiliary brake work of the engine can be realized through the matching work of the brake valve and the reset valve.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a rocker arm mechanism according to an embodiment of the present invention in a normal engine operating condition;

FIG. 2 is a schematic illustration of the rocker arm mechanism of FIG. 1 in an engine braking condition;

FIG. 3 is a schematic illustration of the construction of the brake valve in the rocker mechanism of FIG. 1;

fig. 4 is a schematic diagram of the reset valve in the rocker mechanism of fig. 1.

In the figure: 10-a rocker arm body; 20-rocker shaft; 30-a cam; 40-a brake assembly; 50-a brake valve; 60-a reset valve; 70-exhaust valve bridge; 31-a cam body; 32-exhaust lobe; 33-a braking projection; 41-a brake chamber; 42-a nut; 43-adjusting the bolt; 44-a brake piston; 45-a brake reset; 51-brake valve cavity, 52-piston; 53-piston return; 54-plug screw; 55-an annular groove; 56-oil inlet; 57-a first lube outlet; 58-a second lube outlet; 61-a first lubricating oil chamber; 62-a second lubricant chamber; 63-a valve stem; 64-a valve ball; 65-a reset pin; 01-a first lubricating oil channel; 02-a second lubricating oil channel; 03-a third lubricating oil duct; 04-a brake oil duct; 05-a first reserved gap; 06-second reserved gap.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 4, the present invention provides a rocker arm mechanism, which includes a rocker arm body 10, a rocker arm shaft 20, a cam 30 and a brake assembly 40, wherein the rocker arm body 10 is rotatably connected to the rocker arm shaft 20, one end of the rocker arm body 10 abuts against the cam 30, the brake assembly 40 is disposed at the other end of the rocker arm shaft 20, the rocker arm body 10 is provided with a brake valve 50 and a reset valve 60, a first lubricating oil passage 01 and a second lubricating oil passage 02 are communicated between the brake valve 50 and the reset valve 60, the brake valve 50 can close or open the first lubricating oil passage 01, the reset valve 60 can close or open the second lubricating oil passage 02, and a third lubricating oil passage 03 is communicated between the reset valve 60 and the brake assembly; the cam 30 includes a cam body 31, an exhaust protrusion 32 and a braking protrusion 33, the exhaust protrusion 32 and the braking protrusion 33 are spaced apart in a circumferential direction of the cam body 31, and a maximum lift of the exhaust protrusion 32 is greater than a maximum lift of the braking protrusion 33.

In this embodiment, the brake piston 44 of the brake assembly 40 is used to connect with the exhaust valve bridge 70 (or exhaust valve) to push the exhaust valve bridge 70 (or exhaust valve) to open the valve and complete the exhaust. The brake valve 50 can be communicated with an external lubricating oil supply device, and the lubricating oil entering the brake valve 50 can enter the first lubricating oil channel 01, then enter the reset valve 60 and then enter the brake assembly 40 through the third lubricating oil channel 03 under the condition that the brake valve 50 opens the first lubricating oil channel 01; the lubricating oil introduced into the brake valve 50 can be introduced into the reset valve 60 through the second lubricating oil passage 02 and introduced into the brake assembly 40 through the third lubricating oil passage 03 in the case where the reset valve 60 opens the second lubricating oil passage 02.

Under the normal operating condition of the engine:

in the whole process of the rocker arm body 10 abutting against the cam 30, the brake valve 50 always opens the first lubricating oil channel 01, the lubricating oil entering the brake valve 50 enters the reset valve 60 through the first lubricating oil channel 01, and then enters the brake assembly 40 through the third lubricating oil channel 03, so that all parts of the brake assembly 40 are lubricated all the time.

When the rocker arm body 10 abuts against the braking protrusion 33, since the maximum lift of the braking protrusion 33 is smaller than the first reserved gap between the fixed rod and the braking piston 44 in the braking assembly 40, the maximum lift of the braking protrusion 33 is not enough to abut against the fixed rod and the piston, i.e. the first reserved gap cannot be eliminated, so that the braking piston 44 is not pushed to move continuously, and the valve exhaust is not pushed open.

In the process of abutting the rocker arm body 10 and the exhaust protrusion 32, the control reset valve 60 opens the second lubricating oil channel 02, so that the second lubricating oil channel 02 and the third lubricating oil channel 03 are communicated, lubricating oil in the brake valve 50 can enter the brake assembly 40 through the second lubricating oil channel 02 and the third lubricating oil channel 03, at the moment, the maximum lift range of the exhaust protrusion 32 is larger than a first reserved gap, so that the fixed rod and the piston are abutted, namely the first reserved gap is eliminated (meanwhile, redundant lubricating oil in the brake assembly 40 is extruded out, such as the third lubricating oil channel 03 is extruded out), so that the brake piston can be pushed to move continuously, and then the valve exhaust can be pushed open, so far, the normal exhaust process is completed. When the rocker arm body 10 finishes walking the exhaust bulge 32, the brake piston 44 is reset, the first reserved gap 05 is reserved between the brake piston 44 and the fixed rod again, and the process is repeated.

Under the engine auxiliary braking state:

the brake valve 50 is controlled to close the first lubricating oil channel 01 all the time, after the rocker arm body 10 finishes walking the exhaust protrusion 32 and starts walking the brake protrusion 33, the lubricating oil in the first lubricating oil channel 01, the reset valve 60, the third lubricating oil channel 03 and the brake assembly 40 is sealed, the brake assembly 40 is filled with the lubricating oil, the lubricating oil cannot enter or exit, the lubricating oil can be regarded as hydraulic rigid connection at the moment, the lubricating oil plays a role of transmission force, the lubricating oil cannot enter or exit, then the first reserved gap 05 between the fixing rod and the brake piston 44 is kept unchanged, after the rocker arm body 10 abuts against the brake protrusion 33, the lift range of the brake protrusion 33 is the movement amount of the brake piston 44 pushing the exhaust valve bridge 70 (or the exhaust valve), and therefore the valve can be opened and exhausted in advance, and auxiliary braking is achieved.

The cam 30 continues to rotate, the rocker arm body 10 starts to abut against the exhaust bulge 32, in the process, the reset valve 60 is controlled to open the second lubricating oil channel 02, at the moment, the brake valve 50, the second lubricating oil channel 02, the reset valve 60, the third lubricating oil channel 03 and the brake assembly 40 are communicated with each other, the lubricating oil in the brake assembly 40 can enter and exit, a first reserved gap between the brake piston 44 and the fixed rod can be reduced along with the increase of the lift of the exhaust bulge 32 until the fixed rod abuts against the brake piston 44, the brake piston 44 is pushed to push the exhaust valve bridge 70 (or an exhaust valve) to move, and finally normal exhaust is realized; subsequently, the exhaust valve bridge 70 (or the exhaust valve) is reset, the brake piston 44 is reset, the lubricating oil is replenished into the brake assembly 40 again, when the rocker arm body 10 finishes moving the exhaust bulge 32, a first reserved gap is formed between the brake piston 44 and the fixed rod, and the brake assembly 40 is filled with the lubricating oil to wait for the next advanced exhaust.

The rocker arm mechanism provided by the embodiment can realize normal operation of the engine and auxiliary braking operation of the engine through the cooperation of the braking valve 50 and the reset valve 60 by simultaneously arranging the exhaust protrusion 32 and the braking protrusion 33 with different lifts on the same cam body 31, and has the advantages of simple structure, easiness in control and low cost. The brake valve 50 and the reset valve 60 in this embodiment are provided independently of each other, and their components do not affect each other, thereby avoiding the problems of collision or jamming during braking.

Specifically, the rocker arm mechanism further comprises a rocker arm shaft 20, the rocker arm body 10 is rotatably connected to the rocker arm shaft 20 to realize rocking, and the rocker arm shaft 20 is fixed in an engine system. The rocker arm body 10 is in contact with the cam 30 via the roller, so that the resistance of the relative sliding between the rocker arm body 10 and the cam 30 is reduced, and the abrasion is reduced.

Specifically, the brake assembly 40 includes a brake chamber 41, a fixing rod, a brake piston 44, and a brake return member 45 (e.g., a spring); the fixing rod is an adjusting bolt 43, the brake cavity 41 is arranged at one end, far away from the cam 30, of the rocker arm body 10, the brake cavity 41 penetrates through the rocker arm body 10, one end of the adjusting bolt 43 is fixed to the top of the brake cavity 41 through a nut 42, the other end of the adjusting bolt 43 extends into the brake cavity 41, the brake piston 44 is arranged in the brake cavity 41 and located below the adjusting bolt 43, one end of the brake resetting piece 45 is connected with the top of the brake cavity 41, the other end of the brake resetting piece is connected with the brake piston 44, in a free state of the brake assembly, the brake resetting piece 45 enables a first reserved gap 05 to be formed between the bottom of the adjusting bolt 43 and the brake piston 44, and the brake piston 44 is used for being connected with the exhaust valve bridge 70 (or an exhaust valve).

It should be noted that a lubricating oil passage may be provided in other positions of the rocker arm shaft 20 or the rocker arm body 10 to supply lubricating oil to the parts requiring lubrication.

The brake valve 50 preferably maintains the second lubricant passage 02 in a constantly opened state, and the second lubricant passage 02 is opened or closed by an air charging valve, thereby simplifying the structure.

Further, on the basis of the above-described embodiment, the brake valve 50 may be electrically controlled, for example, by a motor control or an electromagnetic control, or the like.

As an alternative, as shown in fig. 3, the rocker arm body 10 is provided with a brake oil passage 04 for communicating with an external pressure oil supply device, the brake oil passage 04 communicates with the brake valve 50 to supply pressure oil to the brake valve 50, and the brake valve 50 opens the brake oil passage 04 by the pressure oil and closes the first lubricating oil passage 01.

In this embodiment, the brake valve 50 is a hydraulic control valve, pressure oil is introduced into the brake valve 50, under the action of the pressure oil, the brake valve 50 completely opens the brake oil passage 04 and simultaneously completely closes the first lubricating oil passage 01, and when the pressure oil is removed, the brake valve 50 opens the first lubricating oil passage 01 again and simultaneously closes the brake oil passage 04. The brake valve 50 provided by the embodiment can realize the opening and closing of the second lubricating oil channel 02 through hydraulic oil and a mechanical structure thereof, and has the advantages of simple structure and reliable control.

The brake valve 50 that can be opened and closed by hydraulic pressure may have various configurations. For example: the brake valve 50 includes a valve chamber, a tension spring, and a spool, the upper portion of the valve chamber is communicated with the brake oil passage 04, the middle portion of the valve chamber is communicated with the first lubricating oil passage 01 and the second lubricating oil passage 02, one end of the tension spring is connected with the top of the valve chamber, and the other end of the tension spring is connected with the spool, but when pressure enters the valve chamber, pressure oil pushes the spool to move towards the bottom of the valve chamber, so that the brake oil passage 04 is opened and the first lubricating oil passage 01 is closed.

As an alternative: as shown in fig. 3, the brake valve 50 includes a brake valve chamber 51, and a piston 52 and a piston restoring member 53 (e.g., a spring, or a structure made of elastic material) both disposed in the brake valve chamber 51; the top of the brake valve cavity 51 is communicated with the brake oil passage 04, and the middle of the brake valve cavity 51 is communicated with the first lubricating oil passage 01 and the second lubricating oil passage 02; the piston resetting piece 53 is connected between the bottom of the mounting cavity of the brake valve 50 and the bottom of the piston 52, and in a free state, the piston resetting piece 53 enables the top of the piston 52 to be abutted against the top of the brake valve cavity 51 and enables a second reserved gap 06 to be reserved between the bottom of the piston 52 and the bottom of the brake valve cavity.

In this embodiment, the top of the brake valve 50 is communicated with the brake oil passage 04, and in a normal operating state of the engine, the piston returning piece 53 enables the top of the piston 52 to abut against the top of the brake cavity 41, so that the brake oil passage 04 can be closed, the second reserved gap is an amount of pressure oil to move the piston 52 to the bottom of the brake valve cavity 51, the brake oil passage 04 is opened while the second reserved gap is eliminated, and the first lubricating oil passage 01 is closed. The brake valve 50 of this structure is more compact.

Here, the first oil passage 01 may be below the second oil passage 02, and it should be noted that when the piston closes the first oil passage 01, the second oil passage 02 is prevented from being closed.

Optionally, first lubrication oil duct 01 is located the top of second lubrication oil duct 02 for the oil duct structure is clear regular, and convenient processing.

Specifically, the brake valve chamber 51 is arranged through the top of the rocker arm body 10, and the plug 54 is arranged at the top of the brake valve chamber 51 to seal the brake valve chamber 51, so that the installation is convenient.

As shown in fig. 3, on the basis of the above embodiment, further, the middle part of the piston is provided with an annular groove 55, the middle part of one side of the brake valve cavity 51 is provided with an oil inlet 56 for the entry of lubricating oil, the middle part of the other side of the brake valve cavity 51 is provided with a first lubricating oil outlet 57 communicated with the first lubricating oil passage 01 and a second lubricating oil outlet 58 communicated with the second lubricating oil passage 02, and the oil inlet can be communicated with the first lubricating oil outlet 57 and the second lubricating oil outlet 58 through the annular groove 55, respectively.

In this embodiment, the annular groove is formed in the middle of the piston, so that the oil inlet 56 is communicated with the first lubricating oil outlet 57 and the second lubricating oil outlet, and compared with the case that the communicating hole is formed in the piston, when the oil inlet 56, the communicating hole and the first lubricating oil outlet 57 (or the second lubricating oil outlet 58) are opposite to each other, the oil inlet 56 is communicated with the first lubricating oil outlet 57 (or the second lubricating oil outlet 58).

As shown in fig. 3, in addition to the above embodiment, further, one end of the brake oil inlet at the top end of the piston is provided with a chamfer. In this embodiment, the chamfer is disposed at the top of the piston, so that the pressure oil can enter the brake valve cavity 51 conveniently, thereby pushing the piston to move.

As shown in fig. 1, 2 and 4, further, on the basis of the above embodiment, the reset valve 60 includes a first lubricating oil chamber 61, a second lubricating oil chamber 62 and a valve core which are communicated with each other, the first lubricating oil chamber 61 is communicated with the first lubricating oil passage 01, the second lubricating oil chamber 62 is communicated with the second lubricating oil passage 02, and the valve core can close the communication between the first lubricating oil chamber 61 and the second lubricating oil chamber 62 to close the second lubricating oil passage 02.

In this embodiment, when the valve core opens the communication between the first lubricating oil chamber 61 and the second lubricating oil chamber 62, the second lubricating oil passage 02 and the third lubricating oil passage 03 are communicated, at this time, the second lubricating oil passage 02 is in an open state, when the valve core closes the communication between the first lubricating oil chamber 61 and the second lubricating oil chamber 62, the second lubricating oil passage 02 and the third lubricating oil passage 03 are cut off, and at this time, the second lubricating oil passage 02 is in a closed state. The second lubricating oil passage 02 is opened or closed by opening or closing the communication part of the first lubricating oil chamber 61 and the second lubricating oil chamber 62, and the structure is simple. Further, the first oil chamber 61 and the second oil chamber 62 are both provided on the rocker arm body 10, and the first oil chamber 61 is provided through the top of the rocker arm body 10, and the reset valve 60 includes a blocking member provided at the top of the first oil chamber 61 to block the top of the first oil chamber 61. In this embodiment, the first oil chamber 61 and the second oil chamber 62 are directly disposed on the rocker arm body 10, so that the number of parts is small and the installation is convenient.

Wherein the opening and closing arrangement of the valve core to the communication portion of the first lubricating oil chamber 61 and the second lubricating oil chamber 62 can be realized by electric control. However, it is necessary to provide elements for detecting whether the rocker arm body 10 is in contact with the exhaust protrusion, and the rotational state of the cam 30, it is necessary to ensure that the reset valve 60 opens the second lubricating oil passage 02 during the contact of the rocker arm body 10 with the exhaust protrusion 32.

As an alternative, as shown in fig. 4, the valve spool includes a reset pin 65, a valve rod 63, and a valve ball 64, the reset pin 65 is fixedly disposed outside the rocker arm body 10, and the diameter of the first oil chamber 61 is larger than the diameter of the second oil chamber 62; one end of the valve ball 64 is connected with the valve rod 63 and clamped at the communication position of the first lubricating oil chamber 61 and the second lubricating oil chamber 62, and the other end of the valve rod 63 extends out of the second lubricating oil chamber 62, so that the valve rod 63 is abutted with the reset pin 65 in the process of abutting the rocker arm body 10 with the exhaust boss 32.

In this embodiment, the diameter of the first lubricating oil chamber 61 is larger than that of the second lubricating oil chamber 62, a step is formed at the communication position of the first lubricating oil chamber and the second lubricating oil chamber 62, and the valve ball 64 is clamped at the step to isolate the first lubricating oil chamber 61 from the second lubricating oil chamber 62, so that the communication pipeline of the second lubricating oil passage 02 and the third lubricating oil passage 03 is cut off, that is, the second lubricating oil passage is closed. One end of the valve rod 63 extends out of the second lubricating oil cavity 62, in the process that the rocker arm body 10 is abutted to the exhaust bulge 32, the valve rod 63 is abutted to the reset pin 65, the reset pin 65 is fixed along with the continuous increase of the lift range of the exhaust bulge, and the valve rod 63 jacks up the valve ball 64 to the top close to the first lubricating oil cavity 61, so that the first lubricating oil cavity 61 is communicated with the second lubricating oil cavity 62, and the second lubricating oil channel 02 is opened. In this embodiment, the opening and closing control of the second lubricating oil passage 02 is realized through the mechanical structure of the rocker mechanism itself, and the mechanical structure is simple and accurate in control.

Compared with the rocker arm mechanism provided by the embodiment, the reset valve can be used as a one-way valve under the action of no reset pin, namely, the reset valve is opened only when the pressure of the second lubricating oil channel can jack the valve ball, and the lubricating oil flows into the brake assembly from the second lubricating oil channel in a one-way mode; in the case where the reset pin lifts up the valve ball, the reset valve is used as a general valve, and the lubricating oil of the second lubricating oil passage may flow into the brake assembly, and the lubricating oil of the brake assembly may also flow into the second lubricating oil passage, that is, the lubricating oil may flow in both directions in the second lubricating oil passage.

In addition, in the process of engine auxiliary braking, the brake valve 50 is controlled to always close the first lubricating oil passage 01, so that after the rocker arm body 10 finishes walking the exhaust bulge 32 and before the rocker arm body starts walking the brake bulge 33, a lubricating oil route from the first lubricating oil passage 01 to the reset valve 60 and then to the brake assembly 40 is blocked, and lubricating oil cannot enter and exit from the route; if the oil pressure of the second lubricating oil channel can jack up the valve ball, lubricating oil enters the brake assembly through the second lubricating oil channel until the oil in the brake assembly is full of the lubricating oil, at the moment, the lubricating oil in the second lubricating oil channel cannot jack up the valve ball, the lubricating oil can not enter and exit the brake assembly through the route, and the lubricating oil in the brake assembly can be regarded as hydraulic rigid connection.

Further to the above embodiments, a reset valve 60 is provided between the brake valve 50 and the brake assembly 40. This arrangement prevents the first, second, and third lubricating oil passages 01, 02, and 03 from bypassing the rocker arm body 10, enabling the simplest arrangement of oil passages.

The invention provides an engine system, and the rocker arm mechanism is provided. Also included is an exhaust valve bridge 70 (or exhaust valve), with the exhaust valve bridge 70 (or exhaust valve) in the brake assembly 40 being connected. The engine system provided by the embodiment has the advantages of simple and compact structure, smooth braking and reduction of collision and clamping stagnation among components.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Furthermore, those skilled in the art will appreciate that while some of the embodiments described above include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, any of the claimed embodiments may be used in any combination. Additionally, the information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.