CN110886634A

CN110886634A - Brake rocker arm device and engine

Info

Publication number: CN110886634A
Application number: CN201911285153.4A
Authority: CN
Inventors: 曹中基; 陈能舜; 俞展亮; 姜义泉; 周道洋; 柯雨辰
Original assignee: ZHEJIANG KANGHE MECHANICAL TECHNOLOGY Co Ltd
Current assignee: ZHEJIANG KANGHE MECHANICAL TECHNOLOGY Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-03-17

Abstract

A brake rocker arm device and an engine relate to the field of engines. The brake rocker arm device comprises a rocker arm, a rocker arm shaft, a cam and a brake actuating mechanism; a lubricating oil channel, a dislocation oil control mechanism and a brake mechanism are arranged on the rocker arm; the general oil inlet end of the lubricating oil channel, the brake actuating mechanism, the dislocation oil control mechanism, the brake mechanism and the general oil outlet end of the lubricating oil channel are communicated in sequence; the dislocation oil control mechanism is provided with a reset oil passage communicated with the main oil outlet end; the normal exhaust bulge on the cam can be in transmission connection with the rocker arm, so that the brake actuating mechanism can open the exhaust valve, and the dislocation oil control mechanism is communicated with the reset oil duct; when the brake mechanism blocks the lubricating oil channel, the brake bulge on the cam is in transmission connection with the rocker arm, so that the brake actuating mechanism can open the exhaust valve. The engine includes a brake rocker arm arrangement. The invention aims to provide a rocker arm braking device and an engine, so that the cost of engine braking is reduced to a certain extent, and the assembly of the engine braking is facilitated.

Description

Brake rocker arm device and engine

Technical Field

The invention relates to the field of engines, in particular to a brake rocker arm device and an engine.

Background

With the continuous development of domestic economic situation and the rapid construction of highways, the logistics transportation using automobiles as main transportation means has become an important part of national economy. Under the promotion of science and technology, trucks are increasingly heavy and high-speed, the traditional mechanical friction type brake is overwhelmed in working, and traffic accidents are frequent and personal safety is harmed due to the fact that friction plates are seriously abraded and brake hubs are failed due to overhigh temperature. Under such circumstances, engine brakes having high efficiency, sustained and stable retarding performance and no material consumption have received much attention and are being gradually popularized and applied.

In the prior art, engine braking techniques are well known. One prior example of an engine braking device is the hydraulic engine brake disclosed by Cummins (Cummins) in 1965 in US 3220392A. The engine brake in this technology transmits a mechanical input to the exhaust valve to be opened via a hydraulic circuit. The engine braking process is realized by temporarily converting the engine into the compressor. Fuel is cut off during the transition and the exhaust valve is opened near the end of the compression stroke of the engine piston to allow the release of compressed gas (air during braking), the energy absorbed by the compressed gas during the compression stroke of the engine not being returned to the engine piston during the subsequent expansion stroke but being dissipated through the exhaust and heat dissipation system of the engine. And finally, effective engine braking is realized, and the speed of the vehicle is reduced.

At present, the mainstream engine compression braking modes mainly include the following modes:

1. for example, the early cammins engine braking device was an accessory mounted on the engine, and a small valve was added to the engine to provide special engine braking. To install such an engine brake, a gasket is added between the cylinder and the valve cover, which additionally increases the height, weight, and cost of the engine;

2. an integrated rocker arm brake was disclosed in 1974 by the company unibloc usa (JVS) in patent US 3809033A. The brake device is characterized in that a hydraulic system controlled by an electromagnetic valve is added on an engine to form a hydraulic link to control the opening of an exhaust valve, so that the brake function of the engine is realized, the structure has the defects that pressure-bearing oil is always in a closed cavity in the long-term brake process, the continuous brake effect of a brake is influenced due to high-pressure leakage, the additional volume is large, and the manufacturing cost is relatively high;

3. the engine brake device is integrated in the conventional exhaust rocker arm, and the engine brake is realized by additionally arranging the cam brake bulge, so that the structure is compact, the weight is light, and the weight and the volume of the whole engine are greatly reduced on the basis of realizing the engine brake.

There are, however, a number of deficiencies in the development and study of such integrated rocker arm systems. For example, U.S. Pat. No. US6234143B1 of U.S. mark (Mack) truck company 2001 discloses an integrated rocker arm brake that adds an Exhaust Gas Recirculation (EGR) boss to the original cam mechanism, adds a valve bridge, but opens only one exhaust valve during braking, and asymmetric loads also exist on the valve bridge and rocker arm; united states patent US6253730B1, from Cummins engine corporation in 2001, discloses an integrated rocker arm braking system with a valve lift reset mechanism that addresses the above-mentioned asymmetric loading problem caused by opening a single valve during braking. However, the reset time is too short, the reset height is too small, and the engine cannot work normally at a high engine speed; an engine braking device and method disclosed in the application number 200810021786.X of griffith automobile gmbh is easy to control, but requires an additional cam switching device, and is relatively expensive to manufacture and assemble.

Disclosure of Invention

The invention aims to provide a rocker arm braking device and an engine, so that the cost of engine braking is reduced to a certain extent, and the assembly of the engine braking is facilitated.

The embodiment of the invention is realized by the following steps:

a brake rocker arm device comprises a rocker arm and a rocker arm shaft, wherein the rocker arm is pivoted on the rocker arm shaft; one end of the rocker arm is connected with the cam, and the other end of the rocker arm is provided with a brake actuating mechanism for opening the exhaust valve;

the rocker arm is also provided with a lubricating oil channel, a dislocation oil control mechanism and a braking mechanism capable of blocking the lubricating oil channel; the lubricating oil channel comprises an oil inlet end and an oil outlet end; the total oil inlet end and the total oil outlet end are respectively arranged on the rocker arm or the rocker arm shaft;

the total oil inlet end, the brake actuating mechanism, the dislocation oil control mechanism, the brake mechanism and the total oil outlet end are sequentially communicated through the lubricating oil passage; the dislocation oil control mechanism is provided with a reset oil passage communicated with the main oil outlet end;

the cam is provided with a normal exhaust bulge and at least one brake bulge; the height of the braking projection is lower than that of the normal exhaust projection;

the cam rotates and can drive the rocker arm to swing around the rocker arm shaft; the normal exhaust bulge can be in transmission connection with the rocker arm so that the brake actuating mechanism can open an exhaust valve and the dislocation oil control mechanism is communicated with a reset oil duct; when the brake mechanism blocks the lubricating oil channel, the brake bulge is in transmission connection with the rocker arm, so that the brake actuating mechanism can open the exhaust valve.

In any of the above technical solutions, optionally, the rocker arm is provided with a dislocated piston cavity; the rocker arm is provided with a staggered lubricating first hole, a staggered lubricating second hole and a resetting oil hole which are communicated with the staggered piston cavity; the first staggered lubrication hole is communicated with the brake actuating mechanism through the lubricating oil channel, and the second staggered lubrication hole is communicated with the brake mechanism through the lubricating oil channel; the reset oil hole is communicated with the main oil outlet end;

the dislocation oil control mechanism comprises a dislocation piston, a dislocation elastic piece and a reset pin; the reset pin is arranged at the opening of the dislocation piston cavity and is relatively fixed with the rocker shaft;

the dislocation piston and the dislocation elastic piece are both arranged in the dislocation piston cavity, and the dislocation elastic piece is arranged between the dislocation piston and the cavity bottom of the dislocation piston cavity; the dislocation piston can reciprocate along the dislocation piston cavity to change the on-off of the dislocation lubrication first hole and the dislocation lubrication second hole and the on-off of the dislocation lubrication first hole and the reset oil hole; the dislocation elastic piece is used for keeping the dislocation piston in a state of abutting against the reset pin;

when the normal exhaust bulge is in transmission connection with the rocker arm, the rocker arm is close to the reset pin and compresses the dislocation elastic piece, so that the dislocation piston moves towards the cavity bottom of the dislocation piston cavity, the passage between the dislocation lubrication first hole and the dislocation lubrication second hole is broken, and the dislocation lubrication first hole and the reset oil passage formed by the reset oil hole are communicated.

In any of the above technical solutions, optionally, a brake piston cavity is provided on the rocker arm; the rocker arm is provided with a brake lubricating first hole, a brake lubricating second hole and a brake oil hole which are communicated with the brake piston cavity; the first brake lubrication hole is communicated with the dislocation oil control mechanism through the lubricating oil channel, and the second brake lubrication hole is communicated with the main oil outlet end through the lubricating oil channel; the brake oil hole is communicated with a brake oil duct;

the braking mechanism comprises a braking piston and a braking elastic piece;

the braking piston and the braking elastic piece are both arranged in the braking piston cavity, and one end, far away from the braking oil hole, of the braking piston is connected with the braking elastic piece; the brake piston can move back and forth along the brake piston cavity so as to change the connection and disconnection of the brake lubricating first hole and the brake lubricating second hole;

oil can be filled in the brake oil duct to drive the brake piston to move and compress the brake elastic piece, so that a passage between the brake lubrication first hole and the brake lubrication second hole is disconnected.

In any of the above technical solutions, optionally, an oil groove communicating the brake lubrication first hole and the brake lubrication second hole is provided in the middle of the brake piston; an oil groove is formed in one end, close to the braking oil hole, of the braking piston;

and/or the rocker arm shaft is provided with a control mechanism for controlling the on-off of the brake oil passage.

In any of the above technical solutions, optionally, an actuating piston cavity is provided on the rocker arm; the rocker arm is provided with an execution lubricating hole communicated with the execution piston cavity; the execution lubricating hole is communicated with the lubricating oil channel;

the brake actuating mechanism comprises an actuating piston, an actuating elastic piece, an adjusting column and an exhaust valve bridge; the adjusting column is fixedly connected with the rocker arm, and the adjusting column and the actuating piston are arranged at intervals; the exhaust valve bridge is arranged at the opening of the execution piston cavity and is used for being connected with an exhaust valve;

the execution piston and the execution elastic piece are arranged in the execution piston cavity; the actuating elastic piece is sleeved on the adjusting column, one end of the actuating elastic piece is connected with the rocker arm, and the other end of the actuating elastic piece is connected with the actuating piston;

the normal exhaust bulge can be in transmission connection with the rocker arm so as to enable the rocker arm to rotate towards the exhaust valve bridge, and then the exhaust valve bridge is driven to move along with the execution piston to open the exhaust valve;

when the brake rocker arm device works normally, the brake bulge is in transmission connection with the rocker arm, so that the adjusting column moves towards the exhaust valve bridge along with the rocker arm, the execution elastic part is further compressed, the adjusting column is close to or abutted against the execution piston, and an exhaust valve cannot be opened;

when the brake rocker arm device brakes, the brake mechanism blocks the lubricating oil channel so that the execution piston cavity is filled with oil; the braking bulge is in transmission connection with the rocker arm, so that the actuating piston moves towards the exhaust valve bridge along with the rocker arm, and the exhaust valve bridge is driven to move along with the actuating piston to open the exhaust valve.

In any of the above technical solutions, optionally, a clearance between the adjusting column and the actuating piston is L, a clearance between the exhaust valve is a, and when the brake boss is in transmission connection with the rocker arm, a maximum distance that the adjusting column moves to the exhaust valve bridge along with the rocker arm is S1, and then L is greater than or equal to S1+ a; when the normal exhaust bulge is in transmission connection with the rocker arm, the maximum distance of the adjusting column moving to the exhaust valve bridge along with the rocker arm is S2, and S2 is not less than L;

and/or the adjusting column is an adjusting bolt which is detachably and fixedly connected with the rocker arm; and the adjusting bolt is screwed with an adjusting nut connected with the rocker arm.

In any of the above technical solutions, optionally, the brake rocker arm device further includes a one-way mechanism disposed on the rocker arm; the general oil inlet end, the one-way mechanism and the brake actuating mechanism are sequentially communicated through the lubricating oil passage; the one-way mechanism is used for enabling oil in the lubricating oil channel to flow from the total oil inlet end to the brake actuating mechanism in a one-way mode;

and/or the total oil outlet end is communicated with the total oil inlet end.

In any of the above solutions, optionally, the braking protrusions include braking recirculation protrusions and compression release braking protrusions; alternatively, the braking projections comprise compression-release braking projections;

and/or the rocker arm is provided with a roller which is in rolling connection with the cam.

An engine comprises the braking rocker arm device.

In any of the above solutions, optionally, the engine includes a cylinder block;

and a rocker shaft of the brake rocker arm device is fixedly connected with the cylinder body.

The invention has the following beneficial effects:

the invention provides a brake rocker arm device and an engine, which comprise rocker arms, rocker arm shafts, lubricating oil channels, a dislocation oil control mechanism, a brake mechanism and a brake actuating mechanism, wherein the rocker arms are arranged on the rocker arms; the cam rotates to the normal exhaust bulge to be in transmission connection with the rocker arm, so that the brake actuating mechanism can open the exhaust valve, and the exhaust stroke of the engine is realized. When the lubricating oil channel is blocked by the braking mechanism, namely when the engine is braked, the cam rotates to the braking bulge to be in transmission connection with the rocker arm, so that the braking executing mechanism can open the exhaust valve to realize braking exhaust of the engine; the rocker arm is connected through the transmission of the normal exhaust bulge, so that the dislocation oil control mechanism is communicated with the reset oil passage, and the brake actuating mechanism can be reset. According to the braking rocker arm device, the dislocation oil control mechanism, the braking executing mechanism and the like are arranged in a modularized manner, and no complex mechanical hydraulic structure is required to be additionally arranged, so that the braking cost of an engine is reduced to a certain extent, the engine brake can be conveniently installed and assembled to a certain extent, collision and impact among small parts can be reduced, and the risk of abrasion and clamping stagnation is further reduced; the valve has wide applicability and can meet common valve arrangement modes such as two-in-one-row mode, two-in-two-row mode and the like.

In order to make the aforementioned and other objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a cross-sectional view of a brake rocker arm apparatus provided in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of the braking rocker arm apparatus shown in FIG. 1;

FIG. 3 is a partial schematic view of the misalignment oil control mechanism and the one-way mechanism of the brake rocker arm apparatus shown in FIG. 1;

fig. 4 is a partial schematic view of a brake actuator of the brake rocker arm arrangement shown in fig. 1.

Icon: 1-a rocker arm; 2-rocker shaft; 3-a pin; 4-a roller; 5-a cam; 6-braking the actuating mechanism; 7-exhaust valve bridge; 8-a one-way mechanism; 9-a braking mechanism; 10-lubricating oil channel; 11-a first lubricating oil duct; 12-a second lubricating oil channel; 13-a third lubricating oil duct; 14-a fourth lubricating oil channel; 15-a fifth lubricating oil channel; 16-one-way valve plug; 17-a return spring; 18-steel balls; 19-a liner; 20-adjusting the bolt; 21-adjusting the nut; 22-the actuator piston cavity; 23-executing the elastic element; 24-an actuator piston; 25-dislocation oil control mechanism; 26-a reset pin; 27-dislocation socket; 28-offset pistons; 29-dislocated elastic elements; 30-brake plugging; 31-a brake piston; 32-a braking elastic member; 33-a brake oil passage; 34-sixth lubricating oil channel; 35-a first brake gallery; 36-normal exhaust lobe; 37-brake recirculation lobe; 38-compression release brake projection; 39-seventh lubricating oil duct; 40-an execution socket; 41-braking projection.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Examples

Referring to fig. 1 to 4, a brake rocker arm device is provided in the present embodiment, and fig. 1 is a cross-sectional view of the brake rocker arm device provided in the present embodiment; FIG. 2 is a sectional view taken along A-A of the brake rocker arm assembly of FIG. 1 to more clearly show the structure; FIG. 3 is a partially enlarged schematic view of the dislocation oil control mechanism and the one-way mechanism; fig. 4 is a partially enlarged schematic view of the brake actuator.

The brake rocker arm device provided by the embodiment is used for engine braking, and is particularly used for trucks, large commercial buses and the like.

Referring to fig. 1-4, the braking rocker arm device comprises a rocker arm 1 and a rocker arm shaft 2, wherein the rocker arm 1 is pivoted on the rocker arm shaft 2; one end of the rocker arm 1 is connected with a cam 5, and the other end is provided with a brake actuator 6 for opening an exhaust valve. Alternatively, the rocker shaft 2 is provided on the cylinder block of the engine.

The rocker arm 1 is also provided with a lubricating oil passage 10, a dislocation oil control mechanism 25 and a brake mechanism 9 capable of blocking the lubricating oil passage 10; the lubricating oil channel 10 is blocked by the braking mechanism 9, so that the braking actuating mechanism 6 is filled with oil, the braking actuating mechanism 6 moves towards the exhaust valve by a small displacement, and the exhaust valve can be opened.

The lubricating oil passage 10 comprises a total oil inlet end and a total oil outlet end; the total oil inlet end and the total oil outlet end are respectively arranged on the rocker arm 1 or the rocker arm shaft 2. Wherein, the total oil outlet end and the total oil inlet end can be communicated or not communicated; optionally, the oil outlet end is communicated with the oil inlet end to form a circulation of the oil passage 10. Referring to fig. 1, the lubricating oil passage 10 forms a circulation, and the main oil outlet end is communicated with the main oil inlet end and both are provided on the rocker shaft 2.

The total oil inlet end, the brake actuating mechanism 6, the dislocation oil control mechanism 25, the brake mechanism 9 and the total oil outlet end are sequentially communicated through a lubricating oil passage 10; the dislocation oil control mechanism 25 is provided with a reset oil passage communicated with the main oil outlet end; by resetting the oil passage, the brake actuator 6 can be reset in one engine operating cycle. For example, when the engine is braked, the reset oil passage is communicated with the main oil outlet end so as to reset and reset the brake actuating mechanism 6.

The cam 5 is provided with a normal exhaust bulge 36 and at least one brake bulge 41; the height of the braking projection 41 is lower than that of the normal exhaust projection 36; the exhaust stroke of the engine is achieved by the normal exhaust lobe 36; the exhaust of the engine during braking and the non-exhaust during non-braking are realized by the braking bulge 41. Alternatively, the normal exhaust lobe 36 of the cam 5 according to the present embodiment is an exhaust lobe of a conventional cam that is originally provided in the engine. Optionally, the braking protrusions 41 include a brake recirculation protrusion 37 and a compression-release braking protrusion 38; alternatively, the braking projections 41 include compression-release braking projections 38. Wherein, the braking Recirculation bulge 37 is called BGR for short in English and called Brake Gas Recirculation completely; the Compression-Release type braking protrusions 38, CR for short, are all known as Compression-Release. Alternatively, the brake recirculation lobe 37 may be used in conjunction with exhaust braking and a turbocharger after the intake valve closes on the intake stroke and for a period of time after the start of the compression stroke. Alternatively, the compression-release brake lobe 38 acts before the compression stroke ends and after the power stroke begins.

Alternatively, the cam 5 rotates and can drive the rocker arm 1 to swing around the rocker shaft 2; when the engine works normally or the engine is braked, the normal exhaust bulge 36 can be in transmission connection with the rocker arm 1, so that the brake actuating mechanism 6 can open an exhaust valve to realize the exhaust stroke of the engine, and the dislocation oil control mechanism 25 is communicated with a reset oil passage, so that the brake actuating mechanism 6 can be reset and reset; when the engine is braked, the brake mechanism 9 blocks the lubricating oil channel 10, and the brake bulge 41 is in transmission connection with the rocker arm 1, so that the brake actuating mechanism 6 can open an exhaust valve to realize the braking exhaust of the engine.

Optionally, the rocker arm 1 is provided with a roller 4 in rolling connection with the cam 5 to reduce friction between the roller 4 and the cam 5, so that the service life of the rocker arm 1 and the cam 5 can be prolonged. Optionally, one end of the rocker arm 1 is provided with a roller 4 through a pin 3; optionally, the lubrication oil passage 10 includes a fifth lubrication oil passage 15 communicating the rocker shaft 2 and the pin 3, through the fifth lubrication oil passage 15, for lubricating the roller 4.

The brake rocker arm device in the embodiment comprises a rocker arm 1, a rocker arm shaft 2, a lubricating oil channel 10, a dislocation oil control mechanism 25, a brake mechanism 9 and a brake actuating mechanism 6; the rocker arm 1 is in transmission connection with the cam 5 rotating to the normal exhaust lug 36, so that the brake actuator 6 can open an exhaust valve to realize the exhaust stroke of the engine. When the brake mechanism 9 blocks the lubricating oil channel 10, namely when the engine brakes, the cam 5 rotates to the brake bulge 41 to be in transmission connection with the rocker arm 1, so that the brake actuating mechanism 6 can open an exhaust valve to realize the braking exhaust of the engine; the rocker arm 1 is in transmission connection through the normal exhaust bulge 36, so that the dislocation oil control mechanism 25 is communicated with the reset oil passage, and the brake actuating mechanism 6 can be reset. According to the braking rocker arm device, the dislocation oil control mechanism 25, the braking mechanism 9, the braking executing mechanism 6 and the like are arranged in a modularized manner, and no complex mechanical hydraulic structure is required to be additionally arranged, so that the engine braking cost is reduced to a certain extent, the engine braking can be conveniently installed and assembled to a certain extent, the collision and impact among small parts can be reduced, and the risk of abrasion and clamping stagnation is further reduced; the valve has wide applicability and can meet common valve arrangement modes such as two-in-one-row mode, two-in-two-row mode and the like.

The braking exhaust of the engine according to the embodiment may be to open an exhaust valve to exhaust when the compression stroke of the engine piston is near the end, so as to allow the compressed gas (for example, air during braking) to be released; it is also possible to open the exhaust valve for exhaust after the intake valve closes on the intake stroke of the engine and for a period of time after the start of the compression stroke, optionally with exhaust braking and a turbocharger. The brake exhaust of the engine in the embodiment may be exhaust at an exhaust position required in other braking.

Referring to fig. 1 and 3, in an alternative of the present embodiment, a rocker arm 1 is provided with a misaligned piston chamber; the rocker arm 1 is provided with a dislocation lubrication first hole, a dislocation lubrication second hole and a resetting oil hole which are communicated with the dislocation piston cavity; the first staggered lubrication hole is communicated with the brake actuating mechanism 6 through a lubricating oil passage 10, and the second staggered lubrication hole is communicated with the brake mechanism 9 through the lubricating oil passage 10; the reset oil hole is communicated with the main oil outlet end; optionally, the lubricating oil passages 10 include a seventh lubricating oil passage 39, a fourth lubricating oil passage 14 and a third lubricating oil passage 13; the first staggered lubrication hole is communicated with the brake actuating mechanism 6 through a fourth lubricating oil channel 14, and the second staggered lubrication hole is communicated with the brake mechanism 9 through a seventh lubricating oil channel 39; the reset oil hole is communicated with the main oil outlet end through a third lubricating oil passage 13, for example, the reset oil hole is communicated with the rocker shaft 2 through the third lubricating oil passage 13.

The dislocation oil control mechanism 25 comprises a dislocation piston 28, a dislocation elastic piece 29 and a reset pin 26; the reset pin 26 is arranged at the opening of the dislocation piston cavity and is relatively fixed with the rocker shaft 2; optionally, the reset pin 26 is disposed outside or inside the misaligned piston cavity; optionally, the reset pin 26 is disposed outside of the misaligned piston cavity; optionally, the reset pin 26 is provided on the block of the engine.

The dislocation piston 28 and the dislocation elastic element 29 are both arranged in the dislocation piston cavity, and the dislocation elastic element 29 is arranged between the dislocation piston 28 and the cavity bottom of the dislocation piston cavity; namely, one end of the dislocation elastic element 29 is abutted and the other end is connected with the dislocation piston 28; the dislocation piston 28 can reciprocate along the dislocation piston cavity to change the on-off of the dislocation lubrication first hole and the dislocation lubrication second hole and the on-off of the dislocation lubrication first hole and the reset oil hole; the misalignment resilient member 29 has a tendency to move the misalignment piston 28 into abutment with the reset pin 26, i.e. the misalignment resilient member 29 acts to maintain the misalignment piston 28 in abutment with the reset pin 26; optionally, the dislocated spring 29 is in a compressed state. When the engine works normally, the staggered lubrication first hole is communicated with the staggered lubrication second hole, the whole lubricating oil channel is communicated, and the staggered piston 28 blocks the reset oil hole; when the engine is braked, the dislocation lubrication first hole and the dislocation lubrication second hole are disconnected, and the whole lubricating oil channel is disconnected.

When the rocker arm 1 is in transmission connection with the normal exhaust bulge 36, the rocker arm 1 is close to the reset pin 26 and compresses the dislocation elastic piece 29, so that the dislocation piston 28 moves towards the cavity bottom of the dislocation piston cavity, a passage between the dislocation lubrication first hole and the dislocation lubrication second hole is disconnected, and a reset oil passage formed by the dislocation lubrication first hole and the reset oil hole is communicated, so that oil filled in the brake actuating mechanism 6 can be released through the reset oil passage, and the brake actuating mechanism 6 is reset and reset.

Optionally, a misalignment socket 27 is attached to the end of the misalignment piston 28 near the reset pin 26, the misalignment socket 27 abutting the reset pin 26. The offset socket 27 expands the contact area of the offset piston 28 with the reset pin 26 so that the reset pin 26 provides a reaction force to the offset piston 28.

Alternatively, the dislocated elastic member 29 is a spring, or other elastic structure.

Alternatively, the misalignment piston 28 and the misalignment resilient member 29 are mounted coaxially within the misalignment piston cavity.

Referring to fig. 1-3, in an alternative to the present embodiment, a brake piston chamber is provided on the rocker arm 1; the rocker arm 1 is provided with a brake lubricating first hole, a brake lubricating second hole and a brake oil hole which are communicated with a brake piston cavity; the first brake lubrication hole is communicated with the dislocation oil control mechanism 25 through the lubricating oil passage 10, and the second brake lubrication hole is communicated with the main oil outlet end through the lubricating oil passage 10; the brake oil hole is communicated with a brake oil passage 33; alternatively, the lubricating oil passages 10 include a seventh lubricating oil passage 39 and a sixth lubricating oil passage 34; the brake lubrication first hole is communicated with the dislocation oil control mechanism 25 through a seventh lubricating oil channel 39; the brake lubrication second hole is communicated with the main oil outlet end through a sixth lubricating oil channel 34, for example, the brake lubrication second hole is communicated with the rocker shaft 2 through the sixth lubricating oil channel 34. Alternatively, the brake oil holes communicate with the brake oil passage 33 through the first brake oil passage 35.

The brake mechanism 9 includes a brake piston 31 and a brake elastic member 32; alternatively, the braking resilient member 32 is a spring, or other resilient structure. Optionally, the brake piston cavity is hermetically connected with a brake plug 30; the end of the brake piston 31 remote from the brake spring 32 abuts the brake block 30. Optionally, a brake block 30 is threaded with the rocker arm 1.

The brake piston 31 and the brake elastic piece 32 are both arranged in the brake piston cavity, and one end of the brake piston 31 far away from the brake oil hole is connected with the brake elastic piece 32; the brake piston 31 can move back and forth along the brake piston cavity to change the on-off of the brake lubricating first hole and the brake lubricating second hole so as to control the on-off of the lubricating oil channel 10. Alternatively, the brake piston 31 and the brake elastic member 32 are coaxially disposed in the brake piston chamber.

The brake oil passage 33 can be filled with oil to drive the brake piston 31 to move and compress the brake elastic member 32, that is, the brake piston 31 moves towards the brake elastic member 32, so that a passage between the brake lubricating first hole and the brake lubricating second hole is disconnected, the brake lubricating oil passage 10 is disconnected, and engine braking is realized; namely, the oil in the brake actuating mechanism 6 can not be released, when the cam 5 rotates to the brake bulge 41 to drive the connecting rocker arm 1, the brake actuating mechanism 6 can open the exhaust valve, and the brake exhaust of the engine is realized.

Referring to fig. 2, optionally, an oil groove for communicating the brake lubricating first hole and the brake lubricating second hole is formed in the middle of the brake piston 31, and the brake lubricating first hole and the brake lubricating second hole are communicated through the oil groove, that is, the lubricating oil passage 10 is communicated through the oil groove, so that the communication stability of the lubricating oil passage 10 is improved.

Optionally, an oil groove is provided at one end of the brake piston 31 near the brake oil hole; the oil groove is communicated with the brake oil hole, so that the brake oil can better provide pressure for the brake piston 31 through the oil groove, the brake piston 31 is driven to move, the brake elastic part 32 is compressed, the passage between the brake lubricating first hole and the brake lubricating second hole is disconnected, the brake lubricating oil channel 10 is disconnected, and the engine brake is realized.

Referring to fig. 2, the rocker arm 1 or the rocker arm shaft 2 is optionally provided with a control mechanism for controlling the on/off of the brake oil passage 33. Through the control mechanism, the brake oil is convenient to control to enter the brake oil channel 33, and then the brake oil is convenient to control to enter the brake piston cavity to drive the brake piston 31 to move, so that the passage between the brake lubrication first hole and the brake lubrication second hole is disconnected, and the brake mechanism 9 is braked.

Alternatively, the control mechanism is a solenoid valve, an electric valve, or the like.

Alternatively, the brake oil in the brake oil passage 33 is hydraulic oil, lubricating oil, or the like; optionally, the oil in the lubricating oil passage 10 is hydraulic oil, lubricating oil, or the like; alternatively, the brake oil in the brake oil passage 33 may be the same as or different from the oil in the lubrication oil passage 10.

Referring to fig. 1 and 4, in an alternative to the present embodiment, the rocker arm 1 is provided with an actuator piston chamber 22; the rocker arm 1 is provided with an execution lubricating hole communicated with the execution piston cavity 22; the execution lubricating hole is communicated with the lubricating oil channel 10; optionally, the lubricating oil passages 10 include a second lubricating oil passage 12 and a fourth lubricating oil passage 14; the execution lubricating hole is communicated with the general oil inlet end through a second lubricating oil channel 12, and is communicated with the dislocation oil control mechanism 25 through a fourth lubricating oil channel 14.

The brake actuating mechanism 6 comprises an actuating piston 24, an actuating elastic piece 23, an adjusting column and an exhaust valve bridge 7; the adjusting column is fixedly connected with the rocker arm 1 and is arranged at an interval with the actuating piston 24; an exhaust valve bridge 7 is arranged at the opening of the actuator piston chamber 22 for connection with the exhaust valve. Alternatively, the exhaust valve bridge 7 may be connected with two-in-one, two-in-two, or the like valves.

An execution piston 24 and an execution elastic piece 23 are arranged in the execution piston cavity 22; the execution elastic part 23 is sleeved on the adjusting column, one end of the execution elastic part 23 is connected with the rocker arm 1, and the other end of the execution elastic part is connected with the execution piston 24; optionally, the actuating piston 24 has a recess for receiving the actuating spring 23.

The normal exhaust protrusion 36 can be in transmission connection with the rocker arm 1, so that the adjusting column rotates or moves towards the exhaust valve bridge 7 along with the rocker arm 1, the adjusting column is further compressed by the executing elastic part 23, the executing piston 24 is driven to move towards the exhaust valve bridge 7, the exhaust valve bridge 7 is driven to move along with the executing piston 24, an exhaust valve is opened, and an exhaust stroke of the engine is realized.

When the brake rocker arm device works normally, the lubricating oil channel 10 is in a communicated state, the brake bulge 41 is in transmission connection with the rocker arm 1, so that the adjusting column moves towards the exhaust valve bridge 7 along with the rocker arm 1, and the actuating elastic piece 23 is further compressed to enable the adjusting column to be close to or abut against the actuating piston 24; the lift generated by the adjusting column due to the braking protrusion 41 is used for making up the reserved gap between the adjusting column and the actuating piston 24, and the actuating piston 24 cannot be moved towards the exhaust valve bridge 7, so that the exhaust valve cannot be opened to realize the exhaust function.

When the brake rocker arm device brakes, the brake mechanism 9 blocks the lubricating oil channel 10 so that the execution piston cavity 22 is filled with oil, and the oil can not be compressed basically; the braking bulge 41 is in transmission connection with the rocker arm 1, so that the actuating piston 24 moves towards the exhaust valve bridge 7 along with the rocker arm 1, and further the exhaust valve bridge 7 is driven to open an exhaust valve along with the movement of the actuating piston 24, and braking and exhaust are realized. Because the oil filled in the actuating piston cavity 22 can not be compressed basically, when the braking bulge 41 is in transmission connection with the rocker arm 1, the reserved gap between the adjusting column and the actuating piston 24 can not be compressed basically, the rocker arm 1, the adjusting column and the actuating piston 24 move towards the exhaust valve bridge 7 together, and then the exhaust valve bridge 7 is driven to move along with the actuating piston 24 to open the exhaust valve, so that braking and exhaust are realized.

Alternatively, the actuating elastic member 23 is a spring, or other elastic member.

Optionally, the adjusting column is an adjusting bolt 20, and the adjusting bolt 20 is detachably and fixedly connected with the rocker arm 1; an adjusting nut 21 connected with the rocker arm 1 is screwed on the adjusting bolt 20. The adjusting bolt 20 and the adjusting nut 21 are used for adjusting the reserved clearance between the adjusting column and the actuating piston 24, and further the engine brake is facilitated.

Referring to FIGS. 1 and 4, in an alternative embodiment, the clearance between the adjusting column and the actuating piston 24 is L, the exhaust valve clearance is A, and when the braking protrusion 41 is in transmission connection with the rocker arm 1, the maximum distance that the adjusting column moves towards the exhaust valve bridge 7 along with the rocker arm 1 is S1, and L is greater than or equal to S1+ A. When the brake rocker arm device works normally, the brake bulge 41 is in transmission connection with the rocker arm 1 so that the adjusting column moves towards the exhaust valve bridge 7 along with the rocker arm 1, the execution elastic piece 23 is further compressed to reduce or eliminate a reserved gap between the adjusting column and the execution piston 24, the execution piston 24 cannot move towards the exhaust valve bridge 7, and an exhaust valve cannot be opened to realize an exhaust function. Alternatively, when the actuator piston 24 can directly abut the exhaust valve bridge 7, the exhaust valve clearance is the distance between the actuator piston 24 and the exhaust valve bridge 7; alternatively, when the actuator piston 24 abuts the exhaust valve bridge 7 via an actuator socket 40 described below, the exhaust valve clearance is the distance between the actuator socket 40 and the exhaust valve bridge 7.

In the alternative of the embodiment, when the normal exhaust bulge 36 is in transmission connection with the rocker arm 1, the maximum distance of the adjusting column moving to the exhaust valve bridge 7 along with the rocker arm 1 is S2, and S2 is greater than or equal to L; and through S2, L is more than or equal to L, so that the normal exhaust stroke of the engine is realized.

Referring to fig. 1 and 4, optionally, an actuator socket 40 is attached to the actuator piston 24 at an end adjacent the vent bridge 7, the actuator socket 40 abutting the vent bridge 7. The contact area of the actuator piston 24 with the exhaust valve bridge 7 is enlarged by the actuator socket 40, so that the actuator piston 24 drives the exhaust valve bridge 7 to move or the exhaust valve bridge 7 drives the actuator piston 24 to move.

Referring to fig. 1 and 3, in an alternative to the present embodiment, the braking rocker arm device includes a one-way mechanism 8 provided on the rocker arm 1; the general oil inlet end, the one-way mechanism 8 and the brake actuating mechanism 6 are communicated in sequence through a lubricating oil passage 10; the one-way mechanism 8 is used for enabling the oil in the lubricating oil channel 10 to flow in a single direction from the total oil inlet end to the brake actuating mechanism 6; the one-way mechanism 8 divides the inflow and outflow of the oil in the lubricating oil passage 10 into two oil passages, so that the oil in the brake actuating mechanism 6 can not flow in the opposite direction when the brake mechanism 9 brakes, thereby realizing the brake exhaust.

Optionally, the lubricating oil passage 10 includes a first lubricating oil passage 11 and a second lubricating oil passage 12; the oil inlet end is communicated with the one-way mechanism 8 through a first lubricating oil channel 11, and the one-way mechanism 8 is communicated with the brake actuating mechanism 6 through a second lubricating oil channel 12.

Optionally, the one-way mechanism 8 comprises a pad 19, a steel ball 18 and a return spring 17; the rocker arm 1 is provided with a one-way valve hole, and optionally, the one-way valve hole is a step-shaped blind hole. Optionally, the gasket 19 is installed at the bottom of the one-way valve hole, the gasket 19 is connected with the inner cavity of the one-way valve hole of the rocker arm 1 in an interference fit manner, and the top end of the one-way valve hole is provided with a one-way valve plug 16 for packaging and sealing; optionally, a check valve plug 16 is threaded with the rocker arm 1.

Optionally, the lower part of the one-way valve hole is communicated with the first lubricating oil channel 11, and the middle part of the one-way valve hole is communicated with the brake actuating mechanism 6 through the second lubricating oil channel 12; one end of a return spring 17 is tightly propped against the one-way valve plug 16; the other end is tightly propped against the steel ball 18. The reliability of the one-way structure is improved by the one-way mechanism 8 comprising the gasket 19, the steel ball 18 and the return spring 17.

To facilitate understanding of the present embodiment, the following brief description of the working principle of the braking rocker arm device is:

when the engine works normally, in the base circle stage of the cam 5, the brake piston 31 in the brake mechanism 9 is in a non-operation state under the action of the brake elastic piece 32, the oil groove in the middle of the brake piston 31 is communicated with the sixth lubricating oil channel 34 and the seventh lubricating oil channel 39, the oil groove in the middle of the dislocated piston 28 in the dislocated oil control mechanism 25 is communicated with the seventh lubricating oil channel 39 and the fourth lubricating oil channel 14 under the action of the dislocated elastic piece 29 and the reset pin 26. At the moment, the first lubricating oil channel 11, the one-way mechanism 8, the second lubricating oil channel 12, the execution piston cavity 22, the fourth lubricating oil channel 14, the dislocation oil control mechanism 25, the seventh lubricating oil channel 39, the brake mechanism 9 and the sixth lubricating oil channel 34 form a one-way oil channel, and oil enters from the first lubricating oil channel 11 and leaves from the sixth lubricating oil channel 34 and plays a lubricating role through the interior of the rocker arm 1. When the cam 5 rotates until the compression-release type bulge 38 is contacted with the rocker arm 1, the actuating elastic piece 23 is compressed, the reserved clearance L between the adjusting column and the actuating piston 24 is eliminated, and the lift generated by the compression-release type brake bulge 38 is not enough to make up the reserved clearance L because the reserved clearance value L in the brake actuating mechanism 6 is equal to or slightly larger than the sum of the lift of the compression-release type brake bulge 38 and the clearance of the exhaust valve, so that the exhaust valve cannot be opened to realize the exhaust function. When the cam 5 rotates to the normal exhaust bulge 36 to contact with the roller 4, the valve lift is large, and after the reserved clearance L is complemented, enough valve lift amount enables the exhaust valve to act, so that the exhaust valve is opened to realize normal exhaust action.

When the brake is on, the brake oil enters the brake mechanism 9 via the brake oil passage 33, the first brake oil passage 35. The brake piston 31 compresses the brake elastic piece 32 under the action of oil, the brake piston 31 blocks the communication between the sixth lubricating oil channel 34 and the seventh lubricating oil channel 39, when the cam 5 rotates to the contact between the compression release type bulge 38 and the rocker arm 1, the brake actuating mechanism 6 is filled with hydraulic oil, as the one-way mechanism 8 only allows the oil to enter but not discharge, the brake mechanism 9 is in a blocking state, the hydraulic oil in the brake actuating mechanism 6 is regarded as an incompressible body, the gap L is not eliminated, and the rocker arm 1 opens the exhaust valve bridge 7 to realize brake exhaust. After the lift of the compression-release type braking protrusion 38 is finished, the cam 5 continues to rotate and approaches the normal exhaust protrusion 36 to be in contact with the roller 4, and the generated lift is increased until the bottom of the dislocated piston 28 moves upwards under the action of the reset pin 26, so that the third lubricating oil channel 13 is communicated with the oil groove in the middle of the dislocated piston 28 and further communicated with the fourth lubricating oil channel 14. Oil in the brake actuating mechanism 6 is discharged through the third lubricating oil channel 13, the clearance L is reset, normal exhaust valve lifting is realized, and one braking cycle is completed. If the engine braking command is not released, the engine braking cycle will continue with the operation of the engine.

When the control mechanism is turned off, the engine auxiliary braking is finished, the brake oil does not enter the brake oil passage 33 of the rocker arm shaft 2 any more, and the engine returns to the normal operation state.

The embodiment also provides an engine comprising the brake rocker arm device. The engine is provided with the brake rocker arm device, a complex mechanical hydraulic structure is not needed to be additionally arranged through the modularized arrangement of the dislocation oil control mechanism 25, the brake mechanism 9, the brake actuating mechanism 6 and the like, the brake cost of the engine is reduced to a certain extent, the installation and assembly of the engine brake can be facilitated to a certain extent, the collision and impact among small parts can be reduced, and the risk of abrasion and clamping stagnation is further reduced; the valve has wide applicability and can meet common valve arrangement modes such as two-in-one-row mode, two-in-two-row mode and the like.

Optionally, the engine comprises a cylinder block; the rocker shaft 2 of the brake rocker device is fixedly connected with the cylinder body.

Optionally, the reset pin 26 is fixedly connected to the cylinder.

The engine comprises the brake rocker arm device, the technical characteristics of the brake rocker arm device disclosed in the specification are also applicable to the engine, and the technical characteristics of the brake rocker arm device disclosed in the specification are not repeated. The engine in the embodiment has the advantages of the braking rocker arm device, and the advantages of the braking rocker arm device disclosed in the embodiment are not described repeatedly.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The brake rocker arm device is characterized by comprising a rocker arm and a rocker arm shaft, wherein the rocker arm is pivoted on the rocker arm shaft; one end of the rocker arm is connected with the cam, and the other end of the rocker arm is provided with a brake actuating mechanism for opening the exhaust valve;

2. The brake rocker arm apparatus of claim 1, wherein the rocker arm is provided with a misaligned piston cavity; the rocker arm is provided with a staggered lubricating first hole, a staggered lubricating second hole and a resetting oil hole which are communicated with the staggered piston cavity; the first staggered lubrication hole is communicated with the brake actuating mechanism through the lubricating oil channel, and the second staggered lubrication hole is communicated with the brake mechanism through the lubricating oil channel; the reset oil hole is communicated with the main oil outlet end;

3. The brake rocker arm apparatus of claim 1, wherein the rocker arm is provided with a brake piston cavity; the rocker arm is provided with a brake lubricating first hole, a brake lubricating second hole and a brake oil hole which are communicated with the brake piston cavity; the first brake lubrication hole is communicated with the dislocation oil control mechanism through the lubricating oil channel, and the second brake lubrication hole is communicated with the main oil outlet end through the lubricating oil channel; the brake oil hole is communicated with a brake oil duct;

the braking mechanism comprises a braking piston and a braking elastic piece;

4. The brake rocker arm device of claim 3, wherein the brake piston is provided at a middle portion thereof with an oil groove communicating the brake lubrication first hole and the brake lubrication second hole; an oil groove is formed in one end, close to the braking oil hole, of the braking piston;

5. The brake rocker arm apparatus of claim 1, wherein the rocker arm is provided with an actuator piston chamber; the rocker arm is provided with an execution lubricating hole communicated with the execution piston cavity; the execution lubricating hole is communicated with the lubricating oil channel;

6. The brake rocker arm device of claim 5, wherein the size of a gap between the adjusting column and the actuating piston is L, the exhaust valve gap is A, when the brake bulge is in transmission connection with the rocker arm, the maximum distance of the adjusting column moving to the exhaust valve bridge along with the rocker arm is S1, and L is greater than or equal to S1+ A; when the normal exhaust bulge is in transmission connection with the rocker arm, the maximum distance of the adjusting column moving to the exhaust valve bridge along with the rocker arm is S2, and S2 is not less than L;

7. The braking rocker arm apparatus of any one of claims 1 to 6, further comprising a one-way mechanism disposed on the rocker arm; the general oil inlet end, the one-way mechanism and the brake actuating mechanism are sequentially communicated through the lubricating oil passage; the one-way mechanism is used for enabling oil in the lubricating oil channel to flow from the total oil inlet end to the brake actuating mechanism in a one-way mode;

and/or the total oil outlet end is communicated with the total oil inlet end.

8. The braking rocker arm apparatus of any of claims 1-6 wherein the braking lobes include a brake recirculation lobe and a compression release braking lobe; alternatively, the braking projections comprise compression-release braking projections;

9. An engine comprising a braking rocker arm apparatus as claimed in any one of claims 1 to 8.

10. The engine of claim 9, comprising a cylinder block;