CN206221015U - For the rocker arm assembly in the valve actuation system of engine - Google Patents

Abstract

The utility model discloses the rocker arm assembly in a kind of valve actuation system for engine, the engine includes at least one valve, the rocker arm assembly includes being kept with valve the rocking arm and the valve cross arm with rocking arm bonding part at end, and rocking arm bonding part has bonding station and the off-position that end is kept relative to valve.Further, spring unit is arranged on the near interface between valve holding end and rocking arm bonding part.In bonding station, valve keeps end operationally to be abutted with rocking arm bonding part.In off-position, spring unit is used to keep providing reaction force between end and rocking arm bonding part in valve, and valve cross arm is separated from rocking arm.The utility model can prevent valve cross arm from being removed from valve stem due to adhering on rocking arm, and also can eliminate the valve cross arm dislocation or the risk damaged for thereby resulting in.

Description

For the rocker arm assembly in the valve actuation system of engine

Technical field

The utility model relates in general to the rocker arm assembly in a kind of internal combustion engine.More specifically, the utility model is related to one kind For the bonding between valve cross arm and the rocking arm of rocker arm assembly to be overcome by using spring unit under excess play situation The technology of power.

Background technology

The several applications related to internal combustion engine are related to the operation cycle of strict valve mechanism in building machinery industry, thus It is required that valve mechanism possesses excellent quality, reliability and life-span more long.So, the rocking arm in such as valve mechanism is optimized Huge energy and resource has had been put into Deng the work aspect of part and in terms of the relevant connection of these parts and valve. Traditionally, floating transverse arm is used as the interface between rocking arm and valve stem in valve train assembly.Floating transverse arm It is generally the valve stem top for being freely positioned at correlation, while being positioned without limitation relatively also relative to rocking arm.

Valve unit in valve mechanism generally occurs within clearance conditions.Clearance conditions are come between rocking arm and valve stem to be present Space.Usual these spaces are the thermal expansions in adapting to part.Although clearance conditions can be by including such as hydraulic pressure The widely used slack adjuster such as slack adjuster carries out appropriate limitation, but imbalance valve mechanism, unfilled liquid Pressure slack adjuster or complete holosystolic hydraulic lash adjuster may cause improperly to contain to gap.In this case, Rocking arm can keep the sufficiently large gap with valve stem.In view of lubricating oil close to valve mechanism, floating transverse arm often glues It is attached on rocking arm and meeting is because of the surface tension and resulting cohesive force caused by the lubricants capacity for existing between the two And be maintained on rocking arm.Then, during the release conditions of valve, floating transverse arm can be bonded on rocking arm and de- from valve stem From.In periodic process, this phenomenon may cause a kind of such situation：Floating transverse arm can not rightly reset to valve Bar, causes valve to decline, it is impossible to which timely air inlet sprays waste gas.

The A1 of WIPO patent applications 2014/001560（Hereinafter referred to as ' 560 bibliography）It is related to a kind of for valve mechanism group Valve cross arm in part, it provides braking function in compression engine.' 560 bibliography disclose spring and are adjusted in gap Application in device.

The content of the invention

The purpose of this utility model is to provide the rocker arm assembly in a kind of valve actuation system for engine, to keep away Exempt from valve cross arm or the adhesion of floating transverse arm or be maintained on rocking arm.

In one aspect, the utility model describes the rocker arm assembly in a kind of valve actuation system for engine, The engine includes at least one valve, and the rocker arm assembly includes keeping the rocking arm at end and with rocking arm engagement with valve Partial valve cross arm, the rocking arm bonding part has bonding station and the off-position that end is kept relative to valve；It is described Rocker arm assembly also includes spring unit, and the valve that the spring unit is arranged on rocking arm keeps end to be engaged with the rocking arm of valve cross arm On interface between part；In bonding station, the valve keeps end operationally to be abutted with rocking arm bonding part；In release position Put, the spring unit is used to keep providing reaction force between end and rocking arm bonding part in valve so that valve cross arm from Depart from rocking arm.

Further, the spring unit includes the first biasing member for keeping a side at end to extend along the valve With the second biasing member of the another side extension for keeping end along the valve relative to first biasing member；Wherein, institute The first biasing member is stated with the first distal end circular arc portion, and second biasing member has the second distal end circular arc portion, The bonding station, first distal end circular arc portion and second distal end circular arc portion are resiliently arranged in be close to be in and connect Close the outer surface of the valve cross arm of position.

Or, the spring unit is elastic component, and the valve cross arm includes groove, at least the one of the elastic component Part is arranged in the groove, and the opposite end relative with described at least a portion of the elastic component is protected with the valve End is held to abut.

Above-mentioned technical proposal prevents valve cross arm to be removed from valve stem due to adhering on rocking arm, and also eliminates The valve cross arm dislocation for thereby resulting in or the risk damaged.

Brief description of the drawings

Fig. 1 is the section of the rocker arm assembly in the valve actuation system for internal combustion engine conceived according to the utility model Figure, shows the exemplary connection between rocking arm and valve cross arm；

Fig. 2 is the profile of the valve cross arm conceived according to the utility model, depicts and is arranged on valve cross arm and rocking arm Between interface on spring unit one embodiment；

Fig. 3 is the profile of another embodiment of the valve cross arm conceived according to the utility model, depicts and is arranged on Secondary spring unit between valve cross arm and rocking arm.

Specific embodiment

Reference picture 1, shows a kind of exemplary rocker arm component 10 of the valve actuation system 12 for internal combustion engine 14.Internal combustion Machine 14 can be interchangeably referred to as engine 14.Engine 14 can be in building machinery（It is not shown）In use, such as excavator, dress Carrier aircraft, forestry machinery, ocean machinery, large-scale mine truck（LMTs）Machinery similar with other.In one embodiment, engine 14 is four-stroke engine, wherein in a thermodynamic cycle, piston（It is not shown）Perform four-stroke operation（Induction stroke, Compression stroke, combustion stroke and exhaust stroke）.Engine 14 can be implemented as single-cylinder or many cylinder configurations.And, engine 14 can include the available construction of any routine, such as inline configuration, V-configuration and other like configurations.This practicality is new The application of type can expand to the engine in the generating set that business and home amenity are used.

It is contemplated that rocker arm assembly 10 is conducive to a certain amount of air to enter into the combustion chamber of engine 14（It is not shown） In, to support burning.Or, it is also possible to consider that the engine produced as combustion by-products can be reduced with rocker arm assembly 10 14 waste gas.However, the utility model envisions a pair of inlet valves 16 that rocker arm assembly 10 is served only for engine 14, but it may It is very suitable for rocker arm assembly application and performs for one group of exhaust valve in single-cylinder or many cylinder configurations（It is not shown）Class Like arrangement.Rocker arm assembly 10 includes a pair of inlet valves 16, rocking arm 18, rocker arm shaft 20 and valve cross arms 24.

Inlet valve 16 is embodied as two valve lifters as depicted.Inlet valve 16 is usually supported at the cylinder of engine 14 Gai Zhong.For the sake of clarity, cylinder cover is not showed that.Inlet valve 16 is suitable in the open position relative to engine 14 and closure Linearly moved back and forth between position and switched.In open position, inlet valve 16 allows air to flow into the combustion chamber of engine 14 （It is not shown）In.In open position, inlet valve 16 allows air to flow into the combustion chamber of engine 14（It is not shown）In.Inlet valve 16 Including the valve stem 26 engaged with valve cross arm 24.Although the utility model is considered including tappet valve, but it is also possible to considered The inlet valve of various other types.Additionally, various aspects of the present utility model are applied equally to single valve and single cylinder application.

Rocking arm 18 is rotatably installed on rocker arm shaft 20.Rocking arm 18 is by cam-operated.Rocking arm 18 includes that cam is attached end 28 and valve keep end 30.Cam attachment end 28 is connected to cam lobe 32 by follower link 34.The valve of rocking arm 18 keeps End 30 is connected to inlet valve 16 via valve cross arm 24.The rotary motion of cam lobe 32 corresponds to the oscillating movement of rocking arm 18, This accordingly contributes to inlet valve 16 and is switched between open and closed positions relative to engine 14.Rocking arm 18 Valve holding end 30 includes the ball-and-socket joint 36 with bulb 38 and nest portion 40.Rocking arm 18 includes internal thread opening 37, its setting Keep at end 30 receiving ball-and-socket joint 36 in valve.Therefore, nest portion 40 has male thread portion 41, it is arranged to and rocking arm 18 Internal thread opening 37 engage.

Ball-and-socket joint 36 keeps being threadedly coupled to rocking arm 18 at end 30 in valve.Bulb 38 includes surface 42, and it faces gas Door transverse arm 24.Surface 42 is typically the surface of flat smooth, for abutting to valve cross arm 24.

Valve cross arm 24 is the connector between rocking arm 18 and inlet valve 16.Valve cross arm 24 includes rocking arm bonding part 44, rocking arm bonding part 44 be usually free end, but be during operation operationally relative to rocking arm 18 valve keep End 30（Or the surface 42 in bulb 38）Abut.It is arranged on the valve recess 46 at the surface for facing valve stem 26 of valve cross arm 24 （Most preferably finding in Fig. 2 and Fig. 3）Contribute to the engagement of valve cross arm 24 and inlet valve 16.Valve recess 46 can be slideably A part for valve stem 26 is accommodated, but is kept in the unlocked state relative to valve stem 26.Therefore, valve cross arm 24 can be regarded It is floating transverse arm, the floating transverse arm is not exclusively to be kept end 30 to constrain by the valve of rocking arm 18, is also not exclusively limited by valve stem 26 System.Valve cross arm 24 keeps being kept relative to the valve of rocking arm 18 bonding station and the off-position at end 30.In bonding station, push away The dynamic extruding of inlet valve 16 valve spring 48, and therefore, inlet valve 16 is opened relative to engine 14, to allow air to flow into hair In motivation 14.On the contrary, in off-position, inlet valve 16 discharges from bonding station, and is closed relative to engine 14, so as to Air is prevented to be introduced in engine 14.

Generally, valve cross arm 24 is triangle, pyramid or prismatic part, but it is also contemplated that such as cube Other shapes.What the valve of rocking arm 18 kept between end 30 and the rocking arm bonding part 44 of valve cross arm 24 operable abuts only Only it is surface contact therebetween.

Valve holding end 30 includes the smooth planar surface limited by the surface 42 in bulb 38, and it can be added by conventional machinery Work is operated and obtained.Similarly, rocking arm bonding part 44 is smooth planar surface, and it can connect in complementary fashion during operation Touch valve and keep end 30.

Rocker arm assembly 10 is surrounded by lubricant.Used as convention, lubricant is inlet valve 16, rocking arm 18 is different with peripheral parts Movement and running under movement degree provide enough simplicities.Therefore, rocking arm bonding part 44 and valve keep end 30 to soak In lubricant, and therefore, rocking arm bonding part 44 relative to valve keep end 30 undergo a certain size based on lubricant Adhesion.However, the surface tension that can be shown according to the lubricant by being used of the adhesion based on lubricant and its Its characteristic and change.

With reference to Fig. 1, Fig. 2 and Fig. 3, rocker arm assembly 10 includes the spring unit 50 set relative to valve cross arm 24.More Body ground, spring unit 50 is arranged on the valve of rocking arm 18 and keeps being limited between end 30 and the rocking arm bonding part 44 of valve cross arm 24 Interface.In bonding station, spring unit 50 allows the valve of rocking arm 18 to keep end 30 to be engaged with the rocking arm of valve cross arm 24 Operable abutting between part 44.However, in off-position, spring unit 50 is suitable to apply reaction force or opposite force（Its It is substantially higher than the adhesion based on lubricant being present between valve holding end 30 and rocking arm bonding part 44）, to incite somebody to action Valve cross arm 24 is separated with rocking arm 18.

With reference to Fig. 2, the enlarged drawing of spring unit 50 is depicted.Spring unit 50 is leaf spring type, and it includes the first biasing The biasing member 54 of component 52 and second.First biasing member 52 and the second biasing member 54 are fixedly connected to the gas of rocking arm 18 Door keeps end 30.Can threadably realize that the first biasing member 52 and the second biasing member 54 keep the one of end 30 to valve As property assembling.For example, the first biasing member 52 and the second biasing member 54 are connected with nest portion 40, the nest portion 40 is then again and valve End 30 is kept to be threadedly coupled.The assembling of spring unit 50 is performed during the assembling of rocking arm 18 and ball-and-socket joint 36.It is general next Say, valve holding end 30 can include stud（It is not shown）, the screw thread first of spring unit 50 is assembled to the stud.Hereafter, ball-and-socket Joint 36 threadably and be one after the other fixed to valve keep end 30.

The side that first biasing member 52 substantially keeps end 30 along the valve of rocking arm 18 extends, and the second biasing structure Part 54 keeps the another side at end 30 to extend with respect to the first biasing member 52 along valve.First biasing member 52 and the second biasing structure Part 54 includes S shape profiles.Therefore, each in the first biasing member 52 and the second biasing member 54 includes the double circles of spline-like Arc is designed.When spring unit 50 and rocking arm 18 are assembled, the first biasing member 52 and both the second biasing member 54 the can be made One circular arc is arranged on the relative position against valve holding end 30.It is each in first biasing member 52 and the second biasing member 54 The second individual circular arc is arranged at the first distal end circular arc portion 56 and the second distal end circular arc portion 58.When whole observation, spring Unit 50 meets the profile of inside cup-shaped member, because the first biasing member 52 and the second biasing member 54 are upon deployment each other Symmetrically.Bonding station between rocking arm 18 and valve cross arm 24, the first distal end circular arc portion 56 and the second distal end circular arc portion It is resiliently arranged near the outer surface 60 of the valve cross arm 24 in bonding station, to show spring unit 50 both 58 Extended state.

Both first biasing member 52 and the second biasing member 54 are respectively formed the part of integrally formed spring unit 50. In one embodiment, the part that the first biasing member 52 can be a separately formed, and kept for the period of end 30 valve is assembled to The second biasing member 54 can be assembled to.In principle, the first biasing member 52 and the combination of the second biasing member 54 set It is as the leaf spring against the outer surface 60 of valve cross arm 24.This is arranged for provide elastic force to rocking arm against valve cross arm 24 18, and serve as reaction to overcome the adhesion based on lubricant.Therefore, in bonding station, spring unit 50 is in stretching State, and in the released state, spring unit 50 is in contraction state.

With reference to Fig. 3, show that help realizes that the required value of elastic between rocking arm 18 and valve cross arm 24' is based on to overcome Another embodiment of the spring unit 50' of the adhesion of lubricant.As illustrated, the embodiment includes using elastic component （Such as helical spring）, between its rocking arm bonding part 44 that can be located at valve cross arm 24' and the valve holding end 30 of rocking arm 18. In order to spring unit 50' is maintained at into interface, valve cross arm 24' sets fluted 62 at rocking arm bonding part 44.Spring At least a portion of unit 50' is arranged in groove 62, and the opposite end 64 of spring unit 50' substantially abuts valve and keeps end 30.By this way, a certain degree of elasticity is obtained between valve cross arm 24 and rocking arm 18.During operation, the knot of groove 62 Structure is used to accommodate spring unit 50' and keeps the position A at end 30 to position along valve spring unit 50', and position A is Overcome rocking arm bonding part 44 to be engaged with rocking arm 18 to play a role.The further feature of valve cross arm 24' is similar to valve cross arm 24.

In one embodiment, spring unit 50' is freely positioned in groove 62, at the same groove 62 be also possible that by Spring unit 50' is securely maintained at the measure in groove 62.As an example, it may be considered that use industrial adhesive, soldering etc. In setting up this holding relation.

In another embodiment, elastic component（Or spring unit 50'）It is Belleville spring washer（It is not shown）.This be because It is the Belleville spring washer generally shape with conical butt, this imparts spring performance to Belleville spring washer.As spiral shell Rotation spring, Belleville spring washer may be located at valve and keep between end 30 and rocking arm bonding part 44, wherein Belleville spring washer A part be located at groove 62 in, and Belleville spring washer opposite end against valve keep end 30.The receipts of Belleville spring washer Hold together end and may be rubbed against valve to keep end 30 to position, and the expansion end of Belleville spring washer can be abutted with rocking arm bonding part 44.

Industrial applicibility

Generally, the work of rocker arm assembly 10 is related to use lubricant in immediate area.Therefore, the part of rocker arm assembly 10 Leaching is in the lubricant.By the surface that valve holding end 30 and rocking arm bonding part 44 are limited（Surface 42）It is typically smooth flat It is smooth and be largely periodically to contact with each other, therefore, because there are a certain amount of lubrication between two surfaces Agent so that the mutual bonding between two surfaces becomes increasingly to be possible to.Which results in valve cross arm 24 in off-position Each event during be bonded to the valve of rocking arm 18 keep end 30 on.In view of there is the operation of repetition, there is excess play In the case of, valve cross arm 24 becomes increasingly to be possible to from the displacement of valve stem 26.

It is the general characteristic of lubricant with the factor that rocking arm bonding part 44 adheres to that valve keeps end 30.For example, one Individual relatively high-viscosity lubricant may the relatively low lubricant of specific viscosity show different adhesive capacities.Additionally, profit Temperature when lubrication prescription is operated can determine to keep the cohesive force between end 30 and rocking arm bonding part 44 in valve.

In operation, rocking arm 18 is moved between two operable positions.First position is bonding station, and another One position is off-position.The two positions of rocking arm are relative to the definition of valve cross arm 24.In bonding station, rocking arm 18 are swung, and to promote valve cross arm 24, and by doing so it is possible, rocking arm 18 promotes inlet valve 16 with relative to internal combustion engine （ICE）14 limit open position.In off-position, rocking arm 18 discharges valve cross arm 24 from the state of push-and-pull, so that Inlet valve 16 is closed.Situation caused by the gap of excess play situation or incorrect containment can cause rocking arm 18 and valve horizontal Occurs excessive space between arm 24.Because valve keeps there is lubricant between end 30 and rocking arm bonding part 44, therefore, shake Cohesive force between arm 18 and valve cross arm 24 or the adhesion based on lubricant force valve cross arm 24 to depart from and valve stem 26 Engagement.At this point, the spring unit 50,50 ' of the interface being arranged between valve cross arm 24 and rocking arm 18 is to being based on The bonding force of lubricant applies reaction force, thus avoid valve cross arm 24 and is shifted from valve stem 26.In rocker arm assembly 10 In the case of there is gap, this reaction force imparts certain separating degree, and in valve holding end 30 and the gas of rocking arm 18 Minimum aperture is maintained between the rocking arm bonding part 44 of door transverse arm 24.

In spring unit 50 during use, in the first distal end circular arc portion 56 and the second distal end circular arc of spring unit 50 At part 58, reaction force is applied around the indicatrix for keeping simultaneously.Conversely, in the case of application spring unit 50 ', leading to Often apply the position A of motive force to valve cross arm 24 along rocking arm 18（Fig. 3）Produce reaction force.

Each side of the present utility model can work in the case where one or more parts are lacked.Additionally, spring unit 50th, 50 ' characteristic（Such as elastic constant）Can vary depending on the application.It is included in what is applied between rocking arm 18 and valve cross arm 24 The variant for using of the spring of different configuration is both fallen within the range of the utility model.In addition, although present embodiment discloses gas Door transverse arm as floating transverse arm use, but, specification of the present utility model may be equally applicable for be oriented to transverse arm.

Claims (3)

1. a kind of rocker arm assembly in valve actuation system for engine, the engine includes at least one valve, its It is characterised by, the rocker arm assembly includes：

Rocking arm, end is kept with valve；

Valve cross arm, with rocking arm bonding part, the rocking arm bonding part has the engagement that end is kept relative to the valve Position and off-position；And

Spring unit, it is arranged on the rocking arm junction surface that end and the valve cross arm are kept by the valve of the rocking arm / interface for limiting；

Wherein, in the bonding station, the valve keeps end operationally to be abutted with the rocking arm bonding part；Released described Position is put, the spring unit is used to keep providing reaction force between end and the rocking arm bonding part in the valve, with The valve cross arm is separated from the rocking arm.

2. the rocker arm assembly being used in the valve actuation system of engine as claimed in claim 1, it is characterised in that the bullet Spring unit includes the first biasing member extended along a side at valve holding end and relative to the described first biasing structure Part keeps the second biasing member of the another side extension at end along the valve；

Wherein, first biasing member has the first distal end circular arc portion, and second biasing member has the second distal end Circular arc portion, in the bonding station, first distal end circular arc portion and second distal end circular arc portion elasticity are set Near the outer surface of the valve cross arm in bonding station.

3. the rocker arm assembly being used in the valve actuation system of engine as claimed in claim 1, it is characterised in that the gas Door transverse arm includes groove, and the spring unit is elastic component, and at least a portion of the elastic component is arranged on described recessed In groove, and the opposite end relative with described at least a portion of the elastic component keeps end to abut with the valve.