CN105003313A - Engine brake unit - Google Patents
Engine brake unit Download PDFInfo
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- CN105003313A CN105003313A CN201410150399.1A CN201410150399A CN105003313A CN 105003313 A CN105003313 A CN 105003313A CN 201410150399 A CN201410150399 A CN 201410150399A CN 105003313 A CN105003313 A CN 105003313A
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- valve
- brake piston
- brake
- braking
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Abstract
The invention discloses an engine brake unit. The engine brake unit comprises a brake box, wherein a brake piston hole is formed in the brake box; a brake piston is arranged in the brake piston hole; a valve rod positioning hole is formed in one side box wall of the brake box; the axial direction of the valve rod positioning hole is intersected with the axial direction of the brake piston hole; and a gap is formed in the side surface of the brake piston, and is towards the valve rod positioning hole. The engine brake unit uses a valve rod of a valve for positioning the brake box, uses the gap position in the side surface of the brake piston in the brake box for eliminating or building a solid linkage between a cam and the valve, is compact in structure, simplifies an engine brake device, decreases the weight and the height of an engine, increases the operation reliability and durability of the engine, and solves the problems of complicated system, heavy mechanism, large occupation space, difficulty in manufacturing and high cost in the prior art. As the solid linkage is realized between the cam and the valve, such defects as deformation, leakage, overload and weak reliability of hydraulic connection are eliminated.
Description
Technical field:
The present invention relates to mechanical field, particularly relate to the valve actuation field of vehicle motor, particularly a kind of engine braking unit.
Background technique:
The effect of engine braking unit is on the basis of normal engine valve movement, produces the auxiliary valve motion for braking.The compression-release braking of motor opens valve in the later stage of engine piston compresses stroke, is discharged by the high pressure-temperature air produced, allow motor become an endergonic air compressor, make vehicle deceleration in compression stroke in cylinder.A precedent of compression-release braking device by comings (Cummins) in nineteen sixty-five at U.S. Patent number 3,220,392 disclose, and machinery input is delivered to the valve that will open through oil hydraulic circuit by this braking system.Oil hydraulic circuit is usually included in reciprocating main piston in master piston bore, this to-and-fro motion comes from the machinery input of motor, such as the motion of the motion of motor injection cam or adjacent exhaust cam.The hydraulic fluid that moves through of main piston is delivered to sub-piston on oil hydraulic circuit, and make its to-and-fro motion in slave piston bore, sub-piston acts on valve directly or indirectly, produces the valve motion of engine braking running.
The engine braking apparatus of comings is overhead annex on the engine.In order to install this type of engine brake, to packing ring be added between cylinder and valve gap, therefore, increasing the height of motor, weight and cost extraly.Obviously, solution of the above problems is by the component integration of braking device in the existing parts of motor, as in the rocking arm that is integrated in motor or valve bridge, forms integrated form break.The precedent of integrated form rocker arm-braking device has U. S. Patent the 3rd, 367, No. 312 (nineteen sixty-eight), the 3rd, 786, No. 792 and the 3rd, 809, No. 033 (1974), 5th, 564, No. 385 (1996), the 6th, 234, No. 143 and the 6th, 253, No. 730 (calendar year 2001), the 7th, 909, No. 017 and the 8th, 065, No. 987 (2011).The precedent of integrated form valve bridge break has U. S. Patent 3,520,287(1970), the 4th, 572, No. 114 (1986), the 5th, 531, No. 192 (1996), the 6th, 006, No. 706 (1999), the 7th, 905, No. 208 and the 7th, 984, No. 705 (2011).
But integrated form break also has its defect and deficiency.Such as, in rocking arm or valve bridge, increase arrestment mechanism, no matter from aspects such as design, manufacture and uses, both increase difficulty and cost.In addition, a lot of motor does not have rocking arm or valve bridge, cannot integrated engine arrestment mechanism.
Summary of the invention:
The object of the present invention is to provide a kind of engine braking unit, described this engine braking unit will solve that engine braking system of the prior art is complicated, cost is high, not easily installs, mechanism cumbersome and the technical problem such as huge.
This engine braking unit of the present invention comprises a braking casing, wherein, a brake piston hole is provided with in described braking casing, a brake piston is provided with in described brake piston hole, one side box wall inside of braking casing is provided with a valve stem positioning hole, the axis of described valve stem positioning hole is crossing with the axis in brake piston hole, and be provided with a breach in the side of described brake piston, described breach is towards valve stem positioning hole.
Further, described braking casing is arranged in the valve actuation chain of motor, described valve actuation chain comprises cam and valve, brake box body is positioned between described cam and valve, valve contains valve rod, braking casing is socketed on described valve rod by described valve stem positioning hole, braking casing and valve rod between be provided with along stem shaft to sliding pair, the moving direction of brake piston in brake piston hole is vertical with the moving direction of valve rod or close vertical, relative position between the positioning control brake piston of brake piston in brake piston hole and valve rod, when space between brake piston and valve rod is zero, cam is by braking casing, brake piston and valve rod and valve form rigid solid link structure, the described rigid solid link structure that moves through of cam passes to valve.
Further, described valve actuation chain also comprises rocking arm, the middle part of described rocking arm is placed on a pitman arm shaft; one end of rocking arm and cam contact; the other end of rocking arm is connected with braking casing; containing oil supply gallery in rocking arm, and described oil supply gallery is communicated with the brake piston hole in braking casing.
Further, the one end in the brake piston hole in described braking casing is provided with a spring seat, is provided with a return spring between described spring seat and brake piston.
Further, described breach is made up of the annular groove that is cut from the side of brake piston to the axis direction of brake piston, and described annular groove includes at least one bottom surface, at least one described bottom surface and the centerline axis parallel of brake piston.
Or described breach is made up of the bathtub construction that is cut from the side of brake piston to the axis direction of brake piston, and described bathtub construction includes a bottom surface, and at least one described bottom surface is crossing with the central axis of brake piston.
Further, at least one described bottom surface comprises two the step type cylinders or plane that are parallel to each other.
Further, containing a conventional boss strengthened and at least one braking boss on described cam, the conventional valve of the increasing of the conventional boss generation of described increasing rises curve and is made up of bottom and top, the brake valve that described bottom and described braking boss generate rises curve close to same high, and described top rises substantially identical with the conventional valve not having the conventional engine boss of engine braking to generate.
Further, a preloading spring is provided with between valve and braking casing.
Further, the central authorities of described preloading spring are provided with a through hole, and include the flat spring of the two or more number radially extended in preloading spring, described through hole is enclosed within valve rod, and described flat spring is all placed on the spring seat of valve.
Working principle of the present invention is: when engine braking is desired, brake control mechanism is to brake piston hole fuel feeding, the active force of oil pressure counter return spring, brake piston is moved on to application position from non-braking position in brake piston hole, eliminate the space between brake piston and valve, cam is linked by the solid formed between brake unit with valve, cam will be braked the Movement transmit of boss to valve, produces the auxiliary valve motion of engine braking.When not needing engine braking, brake control mechanism closes emptying, brake piston is back into non-braking position from application position by return spring, space is formed between brake piston and valve, cam will be braked the motion skip (motion is lost) of boss, eliminate the auxiliary valve motion producing engine braking, the conventional valve motion of fired state got back to by motor.
The present invention compares with prior art, and its effect is actively with obvious.The present invention utilizes the valve rod location braking casing of valve, the gap position elimination of braking casing inside brake piston side or the solid set up between cam with valve is utilized to link, compact structure, simplify engine braking apparatus, reduce weight and the height of motor, add reliability and the durability of engine operation, solve exist in prior art system complex, mechanism cumbersome, take large quantity space and manufacture the technical problem difficult, cost is high.In addition, what brake unit of the present invention adopted is solid link, eliminates the shortcomings such as the distortion of hydraulic connecting, leakage, overload and poor reliability.
Accompanying drawing illustrates:
Fig. 1 is first embodiment of self-contained engine brake unit of the present invention is in "Off" (non-brake) position schematic diagram at engine braking.
Fig. 2 is first embodiment of self-contained engine brake unit of the present invention is in "ON" (braking) position schematic diagram at engine braking.
Fig. 3 is second embodiment of self-contained engine brake unit of the present invention is in "Off" (non-brake) position schematic diagram at engine braking.
Fig. 4 is second embodiment of self-contained engine brake unit of the present invention is in "ON" (braking) position schematic diagram at engine braking.
Fig. 5 is the 3rd embodiment of self-contained engine brake unit of the present invention is in "Off" (non-brake) position schematic diagram at engine braking.
Fig. 6 is the 3rd embodiment of self-contained engine brake unit of the present invention is in "ON" (braking) position schematic diagram at engine braking.
Embodiment:
Embodiment 1:
As depicted in figs. 1 and 2, first embodiment of engine braking unit of the present invention is respectively in its "Off" (non-brake) and "ON" (braking) position.Three chief components are comprised respectively: valve actuator 200, valve mechanism 300 and engine braking unit 100 in Fig. 1 and Fig. 2.Valve actuator 200 and valve mechanism 300 are two assemblies of valve actuation chain.
The valve actuator 200 of the present embodiment only includes a cam 230, and cam 230 has an increasing boss 220 being mainly used in the running of motor routine on interior basic circle 225, strengthens boss 220 larger than conventional boss (not being with engine braking).The reason strengthened is that brake cam and customary cam integrate, and the cam 230 after integrated is also with the small boss 232 and 233 for engine braking.When engine ignition operates, in order to skip braking small boss 232 and 233, the bottom strengthening boss 220 must increase the transition portion approximately contour with small boss 232 and 233, and its top is equivalent to conventional boss.EGR when braking small boss 232 is for braking, braking small boss 233 is for compressing release.
The valve mechanism 300 of the present embodiment only includes a valve 3001.Valve 3001 by the valve seat 320 of valve spring 3101 overhead in engine cylinder-body 500, stops the flowing of gas between engine cylinder (under valve, not showing) and gas exhaust manifold 600 by spring seat 302.For the conventional engine not having engine braking, the mechanical motion of customary cam (not braking boss) will be directly passed to valve 3001, make it periodically open and close.Here shown is a cylinder of motor, but actual use in motor also can have plural cylinder.
Brake unit 100 is between cam 230 and valve 3001.Brake unit 100 comprises the positioning hole 191 that the braking casing 125(that located by valve stem 301 brakes on casing 125 and is directly enclosed within above valve stem 301), a brake piston hole 190 is provided with in braking casing 125, be provided with a brake piston 160 brake piston hole 190 inner sliding type, brake piston 160 is positioned at the top of valve stem 301 and moves along (being level here) direction vertical with valve motion direction, controls the space 134(Fig. 1 between brake piston 160 and valve stem 301).When space between brake piston 160 and valve stem 301 is zero (Fig. 2), cam 230 is linked, by the Movement transmit of cam 230 to valve 3001 by the solid forming rigidity between described brake unit 100 with valve 3001.Here brake piston 160 has two stepped cylindrical faces: small cylindrical surface 140(Fig. 2 that diameter is less) and the great circle cylinder that coordinates with brake piston hole 190 of diameter.Distance between large and small two cylndrical surface is more than or equal to space 134(Fig. 1).Certainly, brake piston 160 also can replace stepped cylindrical face with step plane, and step plane can be the bottom surface (valve stem 301 is positioned at this guiding groove) of the guiding groove on brake piston 160.In addition, the step surface on brake piston 160 can be two or more.
Preloading spring 198 is provided with between braking casing 125 and cotter seat 302.Whole brake unit 100 is upwards biased on cam 230 by preloading spring 198, and the brake piston 160 in such piston hole 190 is not by the effect of preloading spring 198.Here preloading spring 198 is centrosymmetric compressing tablet springs, there are a through hole in its central authorities containing the two or more flat spring radially arranged (such as six, radial in sun formula), center through hole is enclosed within valve stem 301, and described plural flat spring is placed on the spring seat 302 of valve.Preloading spring 198 also can be the spring of other form, but its effect is all eliminate not following and impacting of the valve actuation chain inside of causing due to space 134.
When engine braking is desired, brake control mechanism 50 opens fuel feeding ("+" mark of Fig. 2), and the machine oil of motor, by fluid passage (comprising the fluid passage 410 in braking casing), enters in brake piston hole 190.The active force of oil pressure counter return spring 156, pushes brake piston 160 to application position from non-braking position, makes the space 134(Fig. 1 between brake piston 160 and valve stem 310) be eliminated (Fig. 2).Cam 230 is linked by the solid forming rigidity between brake unit 100 with valve 3001, is comprised by cam 230(and strengthens boss 220, braking small boss 232 and 233) Movement transmit to valve 3001, produce the auxiliary valve motion of engine braking.
When not needing engine braking, brake control mechanism 50 closes emptying (the "-" mark of Fig. 1), brake piston 160 gets back to non-braking position from application position under the effect of return spring 156, the space 134 of valve actuation chain inside forms (Fig. 1) again, the motion of braking small boss 232 and 233 is skipped, the motion that valve 3001(only has braking casing 125 can not be delivered to, the motion of apneustic 3001), the braking running of motor is removed.Only have the Movement transmit strengthening boss 220 top to valve 3001, produce the conventional valve motion of engine ignition running.
Embodiment 2:
As shown in Figure 3 and Figure 4, second embodiment of engine braking unit of the present invention is respectively in its "Off" (non-brake) and "ON" (braking) position.Compared with first embodiment, the valve actuator 200 of the present embodiment also comprises rocking arm 210, and that is the valve actuation chain of the present embodiment adds this assembly of rocking arm 210.The centre of rocking arm 210 is placed on pitman arm shaft 205, and one end of rocking arm is contacted with cam 230 by roller 235, and the other end of rocking arm 210 is positioned on braking casing 125 by valve clearance controlling mechanism.Valve clearance controlling mechanism comprises being fixed tightly in by nut 105 and resembles foot pad 114 below adjusting screw 110 on rocking arm 210 and adjusting screw pressure ball.So the engine braking unit 100 of the present embodiment is between rocking arm 210 and valve mechanism 300.
The brake unit 100 of the present embodiment and the first embodiment also different, the brake piston hole 190 of wherein braking in casing 125 tilts (tilt angle is less than or equal to friction self-locking angle) a little with substantially horizontal, so the moving direction of brake piston 160 in brake piston hole 190 is not completely vertical with valve motion direction.Brake piston 160 there is a plane 147 tilted with its axis, be positioned on valve stem 301.Brake piston 160 tilt brake piston hole 190 in motion control plane 147 and valve stem 301 between space 134(Fig. 3).It is biased upwards that preloading spring 198 will brake casing 125, pad 114 near the foot that resembles on rocking arm 210.
When engine braking is desired, brake control mechanism 50 opens fuel feeding ("+" mark in Fig. 4 oil supply gallery 211), the machine oil of motor is by the oil supply gallery 211,212,213,214 in pitman arm shaft 205 and rocking arm 210 and the oil supply gallery 115 in adjusting screw, oil supply gallery 410 in braking casing 125, and oil groove 137 on brake piston 160 and oil supply gallery 152, enter in brake piston hole 190.The active force of oil pressure counter return spring 156, pushes brake piston 160 to application position from non-braking position, makes the space 134(Fig. 3 between brake piston 160 and valve stem 310) be eliminated (Fig. 4).Cam 230 link by the rigid solid formed between brake unit 100 with valve 3001, is comprised by cam 230(strengthening boss 220, braking boss 232 and 233) Movement transmit to valve 3001, the auxiliary valve motion of generation engine braking.
When not needing engine braking, brake control mechanism 50 is closed and emptying (the "-" mark in Fig. 3 oil supply gallery 211), brake piston 160 gets back to non-braking position from application position under the effect of return spring 156, the space 134 of valve actuation chain inside forms (Fig. 3) again, the motion of braking boss 232 and 233 is skipped, the motion that valve 3001(only has braking casing 125 can not be delivered to, the motion of apneustic 3001), the braking running of motor is removed.Only have the Movement transmit strengthening boss 220 top to valve 3001, produce the conventional valve motion of engine ignition running.
Embodiment 3:
As shown in Figure 5 and Figure 6, the 3rd embodiment of engine braking unit of the present invention is respectively in its "Off" (non-brake) and "ON" (braking) position.Unique difference of the present embodiment and second embodiment brake piston 160 has two planes 140 and 141 tilted with its axis.Because plane 140 and 141 is formed with the step of a discrepancy in elevation, brake piston 160 moves to space 134(that non-braking position (Fig. 5) formed with reference to figure 3 and Fig. 4 from application position (Fig. 6)) will be the discrepancy in elevation of two step surfaces 140 and 141 and the summation of brake piston 160 banking motion.That is, the 3rd embodiment is the comprehensive of first embodiment and second embodiment substantially.Certainly, step plane 140 and 141 here also can be the bottom surface (valve stem 301 is positioned at this guiding groove) of the guiding groove on brake piston 160, and can be plural step surface.
Above-mentioned many embodiments, should not be regarded as limitation of the scope of the invention, but representatively concrete illustrations more of the present invention, other differentiation many all likely therefrom produce.For example, engine braking apparatus proposed by the invention and method, not only may be used for overhead camshaft type engine, is also applicable to push rod engine; Not only can produce compression-release engine braking (comprise band and be not with exhaust gas recirculatioon), also can produce air-leakage type engine braking (comprising partial periodicity and complete period air-leakage type engine braking).
In addition, the form of return spring and preloading spring also can be varied with settling.
Further, the form of brake piston also can be different, and the step surface above piston, the quantity on inclined-plane and shape etc. also can be different.
In addition, the quantity of cam convex platform and shape also can change as required.
Therefore, scope of the present invention should not decided by above-mentioned concrete illustration, but is decided by claim.
Claims (10)
1. an engine braking unit, comprise a braking casing, it is characterized in that: in described braking casing, be provided with a brake piston hole, a brake piston is provided with in described brake piston hole, one side box wall inside of braking casing is provided with a valve stem positioning hole, the axis of described valve stem positioning hole is crossing with the axis in brake piston hole, and be provided with a breach in the side of described brake piston, described breach is towards valve stem positioning hole.
2. engine braking unit as claimed in claim 1, it is characterized in that: described braking casing is arranged in the valve actuation chain of motor, described valve actuation chain comprises cam and valve, brake box body is positioned between described cam and valve, valve contains valve rod, braking casing is socketed on described valve rod by described valve stem positioning hole, braking casing and valve rod between be provided with along stem shaft to sliding pair, the moving direction of brake piston in brake piston hole is vertical with the moving direction of valve rod or close vertical, relative position between the positioning control brake piston of brake piston in brake piston hole and valve rod, when space between brake piston and valve rod is zero, cam is by braking casing, brake piston and valve rod and valve form rigid solid link structure, the described rigid solid link structure that moves through of cam passes to valve.
3. engine braking unit as claimed in claim 2, it is characterized in that: described valve actuation chain component also comprises rocking arm, the middle part of described rocking arm is placed on a pitman arm shaft; one end of rocking arm and cam contact; the other end of rocking arm is connected with braking casing; containing oil supply gallery in rocking arm, and described oil supply gallery is communicated with the brake piston hole in braking casing.
4. engine braking unit as claimed in claim 1, is characterized in that: the one end in the brake piston hole in described braking casing is provided with a spring seat, is provided with a return spring between described spring seat and brake piston.
5. engine braking unit as claimed in claim 1, it is characterized in that: described breach is made up of the annular groove that is cut from the side of brake piston to the axis direction of brake piston, described annular groove includes at least one bottom surface, at least one described bottom surface and the centerline axis parallel of brake piston.
6. engine braking unit as claimed in claim 1, it is characterized in that: described breach is made up of the bathtub construction that is cut from the side of brake piston to the axis direction of brake piston, described bathtub construction includes at least one bottom surface, and at least one described bottom surface is crossing with the central axis of brake piston.
7. the engine braking unit as described in claim 5 or 6, is characterized in that: at least one described bottom surface comprises two the step type cylinders or plane that are parallel to each other.
8. engine braking unit as claimed in claim 2, it is characterized in that: containing a conventional boss strengthened and at least one braking boss on described cam, the conventional valve of the increasing of the conventional boss generation of described increasing rises curve and is made up of bottom and top, the brake valve that described bottom and described braking boss generate rises curve close to same high, and described top rises substantially identical with the conventional valve not having the conventional engine boss of engine braking to generate.
9. engine braking unit as claimed in claim 2, is characterized in that: be provided with a preloading spring between valve and braking casing.
10. engine braking unit as claimed in claim 9, it is characterized in that: the central authorities of described preloading spring are provided with a through hole, the flat spring of the two or more number radially extended is included in preloading spring, described through hole is enclosed within valve rod, and described flat spring is all placed on the spring seat of valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410150399.1A CN105003313A (en) | 2014-04-15 | 2014-04-15 | Engine brake unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410150399.1A CN105003313A (en) | 2014-04-15 | 2014-04-15 | Engine brake unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105003313A true CN105003313A (en) | 2015-10-28 |
Family
ID=54376139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410150399.1A Pending CN105003313A (en) | 2014-04-15 | 2014-04-15 | Engine brake unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105003313A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021124459A1 (en) | 2021-09-22 | 2023-03-23 | Schaeffler Technologies AG & Co. KG | Actuator for actuating a switchable valve contact carrier for a valve train of an internal combustion engine and a rocker arm arrangement for a valve train of an internal combustion engine with such an actuator |
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| JP2004084629A (en) * | 2002-08-28 | 2004-03-18 | Nippon Piston Ring Co Ltd | Valve mechanism |
| JP2008208795A (en) * | 2007-02-27 | 2008-09-11 | Honda Motor Co Ltd | Engine |
| CN102011622A (en) * | 2009-09-07 | 2011-04-13 | 上海尤顺汽车部件有限公司 | Improved engine brake driving device |
| CN202017536U (en) * | 2011-03-16 | 2011-10-26 | 奚勇 | Device for braking engine by using valve bridge |
| US20130068195A1 (en) * | 2011-09-21 | 2013-03-21 | Jacobs Vehicle Systems, Inc. | Method and system for engine cylinder decompression |
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2014
- 2014-04-15 CN CN201410150399.1A patent/CN105003313A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001524640A (en) * | 1997-11-21 | 2001-12-04 | ディーゼル エンジン リターダーズ，インコーポレイテッド | Integrated lost motion system for delay and EGR |
| JP2004084629A (en) * | 2002-08-28 | 2004-03-18 | Nippon Piston Ring Co Ltd | Valve mechanism |
| JP2008208795A (en) * | 2007-02-27 | 2008-09-11 | Honda Motor Co Ltd | Engine |
| CN102011622A (en) * | 2009-09-07 | 2011-04-13 | 上海尤顺汽车部件有限公司 | Improved engine brake driving device |
| CN202017536U (en) * | 2011-03-16 | 2011-10-26 | 奚勇 | Device for braking engine by using valve bridge |
| US20130068195A1 (en) * | 2011-09-21 | 2013-03-21 | Jacobs Vehicle Systems, Inc. | Method and system for engine cylinder decompression |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021124459A1 (en) | 2021-09-22 | 2023-03-23 | Schaeffler Technologies AG & Co. KG | Actuator for actuating a switchable valve contact carrier for a valve train of an internal combustion engine and a rocker arm arrangement for a valve train of an internal combustion engine with such an actuator |
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Application publication date: 20151028 |