CN103939172A - Independent cam type engine braking device - Google Patents
Independent cam type engine braking device Download PDFInfo
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- CN103939172A CN103939172A CN201410113623.XA CN201410113623A CN103939172A CN 103939172 A CN103939172 A CN 103939172A CN 201410113623 A CN201410113623 A CN 201410113623A CN 103939172 A CN103939172 A CN 103939172A
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Abstract
The invention relates to an independent cam type engine braking device. An eccentric shaft sleeve of an eccentric swing arm of the device is placed in an eccentric swing arm hole of an exhaust swing arm. A swing arm shaft penetrates through the eccentric shaft sleeve of the eccentric swing arm, and the exhaust swing arm can rotate around the swing arm shaft along with the eccentric swing arm. A gap control device is integrated at the swing arm front end of the eccentric swing arm. A roller shaft is arranged at one end of the exhaust swing arm, and an exhaust roller and a braking roller are mounted on the roller shaft. An exhaust cam on a cam shaft abuts against the exhaust roller, and a braking cam on the cam shaft corresponds to the braking roller in position. A gap compensation mechanism is mounted at the other end of the exhaust swing arm. The bottom of the gap compensation mechanism abuts against a valve bridge. According to the independent cam type engine braking device, the eccentric swing arm is arranged between the exhaust swing arm and the swing arm shaft, and when an engine brakes and works normally, the eccentric swing arm is selectively locked at different positions. Accordingly, the braking function of the engine is achieved, an exhaust valve is opened, the structure is simple, the rigidity is good, the braking efficiency is high, the cost is low, and the reliability is good.
Description
Technical field
The invention belongs to engine braking apparatus technical field, relating to one, to be applicable to vehicular gross combined weight large, only relies on the main brake of automobile self can not meet the independent cam engine brake device of brake request under vehicle high-speed fully loaded transportation condition.
Background technique
The gross mass of Hyundai Motor is increasing, and the speed of a motor vehicle is more and more higher, and car load, in the time of heavily loaded lower long slope, only relies on the primary brake system of vehicle self can not meet the brake request under vehicle high-speed fully loaded transportation condition.In order to ensure the Safety performance of vehicle, must increase complemental brake system.Engine braking is the holder of falling to motor by automobile, utilizes mechanical loss, pumping loss and the compression work etc. of motor to produce braking function, thereby increases automobile brake power.
Car load, in the time of the precipitous road surface such as lower long slope, rugged hill path, must utilize engine braking, effectively reduces the frequency of utilization of service brake, avoid because of the long-time break that uses, cause the temperature of brake bush to raise, braking force is declined, even ineffective.
At present, the engine braking of applying on motor is mainly divided into lose heart braking and two kinds of compression brakes: the brake structure that loses heart is simple, and it is easy to realize, and cost is low; Compression brake structure relative complex, cost is higher, but the braking force obtaining is larger.As the integrated brake device in valve bridge, rocking arm that passes through of " air-leakage type engine brake device of integrated form " (application number: 201120048690 day for announcing 2012.02.08) application is realized deflation type engine braking; " the moving variable valve actuation system of sky of opening in advance for engine braking and exhaust " of Jacobs Vehicle Systems Inc. application (application number: 201080019296.1, open day: 2011.6.1) realize Compression Engine braking by hydraulic way; All can win " Primaryand OffsetActuatorRockerArmsforEngineValveActuation " (publication number: US7392772B2) of company's application, realize Compression Engine braking by independent cam; All can win " DedicatedRockerArmEngineBrake " (publication number WO2010/126479A1) of company's application, realize Compression Engine braking by rocking arm integration mode.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of simple in structure, good rigidity, the independent cam engine brake device that braking force is high, cost is low.
In order to solve the problems of the technologies described above, independent cam engine brake device of the present invention comprises exhaust rocker arm, pitman arm shaft, rocker compensating gear, eccentric swinging arm, gap control device, exhaust roller, brake wheel, roller shaft, camshaft, air valve bridge, exhaust valve; The excentric sleeve of described eccentric swinging arm is positioned at the eccentric swinging arm hole of exhaust rocker arm; In the excentric sleeve of pitman arm shaft by eccentric swinging arm, pass, exhaust rocker arm can rotate around pitman arm shaft with eccentric swinging arm; Gap control device is integrated in the swing arm front end of eccentric swinging arm; One end of exhaust rocker arm is provided with roller shaft, and exhaust roller and brake wheel are installed on roller shaft; Exhaust cam on camshaft and exhaust roller offset, and the brake cam on camshaft is corresponding with brake wheel position; The other end of exhaust rocker arm is provided with rocker compensating gear; Rocker compensating gear bottom offsets with air valve bridge.
When engine work, exhaust rocker arm open and close exhaust valve under the driving of exhaust cam is realized exhaust stroke.Brake cam on brake wheel and camshaft contacts, and can realize engine compression brake, near engine compresses stroke top dead center, opens exhaust valve.In the time that motor is made positive work, above-mentioned brake cam can convert an EGR cam to, is used to provide an EGR stroke.Eccentric swinging arm is arranged between exhaust rocker arm and pitman arm shaft, is optionally locked in diverse location in the time of engine braking and engine work.Thereby realize engine braking function, open exhaust valve.
This independent cam type engine braking is simple in structure, good rigidity, and braking force is high, cost is low; Rotation by eccentric swinging arm in whole braking process carrys out the brake clearance in compensate for clearance compensation mechanism, has replaced hydraulic actuator, has improved the reliability of engine braking working procedure.
Engine braking of the present invention is the one of compression brake, belongs to independent cam type engine braking, and a special cam is for engine braking.
Described rocker compensating gear comprises adjustment bolt, elastic member, pressure ball; Adjust bolt and be fixed in the through hole of exhaust rocker arm end, the top of pressure ball is positioned at the bottom of this through hole, adjusts bolt and is connected with pressure ball by elastic member; And adjust between bolt and pressure ball and leave gap; The bottom of pressure ball and pressure ball seat upper surface offset, and bottom surface and the air valve bridge of pressure ball seat offset.
Described pitman arm shaft inside is processed with normal open oil circuit and the radial direction oil hole of extending vertically; In engine working process, can provide lubricated to one or more rocking arms.
On the excentric sleeve of described eccentric swinging arm, be processed with radial direction oil hole; In engine working process, can provide lubricated to the excentric sleeve of one or more eccentric swinging arms.
On described exhaust rocker arm, be processed with the first oilhole, this oilhole communicates with installation through hole and the eccentric swinging arm hole of adjusting bolt, is processed with vertical oilhole on pressure ball, can provide lubricated to pressure ball seat.
On described exhaust rocker arm, be also processed with the second oilhole, this oilhole communicates with the radial direction oil hole of eccentric swinging arm hole and pitman arm shaft; In engine working process, can provide lubricated to exhaust roller and brake wheel.
Described cylinder is made up of cylinder block, return spring, stop collar, execution piston; The swing arm front end of eccentric swinging arm is connected with the upper end of carrying out piston; Lower end, the return spring of carrying out piston are arranged in control valve body, and stop collar is fixed on the top of control valve body, and the lower air holes of control valve body communicates with pressure system.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Independent cam engine brake device sectional view of the present invention when Fig. 1 is engine work.
Independent cam engine brake device side view of the present invention when Fig. 2 is engine work.
The sectional view of independent cam engine brake device of the present invention when Fig. 3 is engine braking work.
The side view of independent cam engine brake device of the present invention when Fig. 4 is engine braking work.
Fig. 5 is the side view of Rocker arm assembly.
Fig. 6 is the decomposition view of Rocker arm assembly.
Fig. 7 is the front elevation of independent cam engine brake device of the present invention.
Fig. 8 is the rear view of independent cam engine brake device of the present invention.
Fig. 9 is the sectional view of cylinder.
Figure 10 is eccentric swinging arm axial location variation diagram.
Block diagram when Figure 11 is engine braking apparatus work.
Embodiment
As shown in Fig. 1-8, independent cam engine brake device of the present invention comprises exhaust rocker arm 1, pitman arm shaft 2, eccentric swinging arm 3, exhaust roller 4, brake wheel 5, roller shaft 6, camshaft 7, rocker compensating gear, air valve bridge 13, exhaust valve 14, gap control device.
The central authorities of exhaust rocker arm 1 are processed with an eccentric swinging arm hole, and the excentric sleeve part of eccentric swinging arm 3 is arranged in eccentric swinging arm hole, in the excentric sleeve of pitman arm shaft 2 by eccentric swinging arm 3, pass; Exhaust rocker arm 1 can rotate around pitman arm shaft 2.Described rocker compensating gear comprises adjusts bolt 8, elastic member 10, pressure ball 11; Elastic member 10 adopts spring, reed or other elastic elements, adjusts bolt 8 and is fixed in the through hole of exhaust rocker arm 1 one end, and the top of pressure ball 11 is positioned at the bottom of this through hole, and its bottom surface is spherical convex surface; Adjust bolt 8 and be connected with pressure ball 11 by elastic member 10, and adjust between bolt 8 and pressure ball 11 and leave gap; The upper surface of pressure ball seat 12 is spherical concave surface.The bottom surface of pressure ball 11 and pressure ball seat 12 upper surfaces offset.The other end of exhaust rocker arm 1 is arranged a roller axis hole, and roller shaft 6 is arranged in roller axis hole, and what exhaust roller 4 was adjacent with brake wheel 5 is arranged on roller shaft 6.Exhaust cam 701 on camshaft 7 offsets with exhaust roller 4, and the brake cam 702 on camshaft 7 is corresponding with brake wheel 5 positions.
As shown in Figure 9, gap control device is integrated in the swing arm front end of eccentric swinging arm 3, is made up of cylinder block 151, return spring 152, stop collar 153, execution piston 154; The swing arm front end of eccentric swinging arm 3 is connected with the upper end of carrying out piston 154; Bottom, the return spring 152 of carrying out piston 154 are arranged in control valve body 151, and the bottom of carrying out piston 154 can be in the interior slip of cylinder block 151.Stop collar 153 is fixed on the top of control valve body 151, controls and carries out the lift of piston 154 in cylinder block 151, thereby control the angle that eccentric swinging arm 3 rotates.The lower air holes of control valve body 151 communicates with pressure system.By opening and closing pressure system solenoid valve, the gas in gas holder can by selectivity be fed to cylinder block 151 bottoms, promote to carry out piston 154 and move, thereby drive eccentric swinging arm 3 to rotate.
Described pitman arm shaft 2 inside are processed with normal open oil circuit 201 and the radial direction oil hole 202 of extending vertically; On the excentric sleeve of eccentric swinging arm 3, be processed with radial direction oil hole 301; In engine working process, can provide lubricated to pitman arm shaft 2 and excentric sleeve.The first oilhole 101 on exhaust rocker arm communicates with installation through hole and the eccentric swinging arm hole of adjusting bolt 8, is processed with vertical oilhole 111 on pressure ball 11, can provide lubricated to pressure ball seat 12.The second oilhole 102 on exhaust rocker arm 1 communicates with the eccentric swinging arm hole of eccentric swinging arm 3 and the radial direction oil hole of pitman arm shaft 2; In engine working process, can provide lubricated to exhaust roller 4 and brake wheel 5.
Described exhaust valve 14 is mushroom valves, for flowing of gas between control engine internal furnace and intake and exhaust manifold.
When engine work, exhaust cam 701 on camshaft 7 contacts with the exhaust roller 4 on exhaust rocker arm 1, exhaust rocker arm 1 rotates around pitman arm shaft 2 under the effect of camshaft 7, and exhaust rocker arm 1 open and close exhaust valve 14 under the driving of exhaust cam 701 is realized exhaust stroke.
As shown in figure 10, when engine work, the axial location of eccentric swinging arm 3 is A, adjusts between bolt 8 and pressure ball 11 and has certain gap.In the time that needs engine braking is worked, eccentric swinging arm 3 rotates, axial location becomes A ', exhaust rocker arm 1 is along with eccentric swinging arm 3 rotates and moves down a bit of distance, drive adjustment bolt 8 to move down simultaneously, gap between compensation adjustment bolt 8 and pressure ball 11, the little lift of brake cam 702 works, and realizes braking function.
As shown in figure 11, engine braking apparatus workflow is as follows:
When car load is at lower long slope, under the precipitous road surface such as rugged hill path or high-speed overload condition, while needing engine braking work, engine electronic control unit ECU sends instruction, pressure system solenoid valve is opened, the pore of pressurized gas in gas holder on cylinder enters cylinder block 151 bottoms, promoting to carry out piston 154 moves upward, carrying out piston 154 drives eccentric swinging arm 3 to rotate to an angle around pitman arm shaft 2, exhaust rocker arm 1 moves downward with eccentric swinging arm 9 rotations with adjustment bolt 8 simultaneously, gap between compensation adjustment bolt 8 and pressure ball 11, when execution piston 154 is up to stop collar 153 bottom, adjusting bolt 8 contacts with pressure ball 11, the little lift of brake cam 702 works, before compression top center, open exhaust valve, discharge cylinder inner high voltage gas, improve braking force.
As shown in Figure 3, while cancelling braking state, engine electronic control unit sends instruction, closed electromagnetic valve, pressurized gas overflow from cylinder block 151 bottoms, cylinder block 151 bottom gas pressures are reduced to and approach 0, carry out piston 154 and arrive next time bottom in the effect of return spring 152, drive eccentric swinging arm 3 around pitman arm shaft 2 opposite spin several angles, exhaust rocker arm 1 rotates with eccentric swinging arm 3 with adjustment bolt 8, thereby make to adjust the gap of recovering reserved between bolt 8 and pressure ball 11, the lift of brake cam 702 is fallen by this backlash compensation, braking lift is inoperative, engine work.
Claims (7)
1. an independent cam engine brake device, comprises exhaust rocker arm (1), pitman arm shaft (2), gap control device, exhaust roller (4), brake wheel (5), roller shaft (6), camshaft (7), air valve bridge (13), exhaust valve (14); One end of exhaust rocker arm (1) is provided with roller shaft (6), and exhaust roller (4) and brake wheel (5) are installed on roller shaft (6); Exhaust cam (701) on camshaft (7) offsets with exhaust roller (4), and the brake cam (702) on camshaft (7) is corresponding with brake wheel (5) position; Characterized by further comprising rocker compensating gear, eccentric swinging arm (3); The excentric sleeve of described eccentric swinging arm (3) is positioned at the eccentric swinging arm hole of exhaust rocker arm (1); In the excentric sleeve of pitman arm shaft (2) by eccentric swinging arm (3), pass, exhaust rocker arm (1) can rotate around pitman arm shaft (2) with eccentric swinging arm (3); Gap control device is integrated in the swing arm front end of eccentric swinging arm (3); The other end of exhaust rocker arm (1) is provided with rocker compensating gear; Rocker compensating gear bottom offsets with air valve bridge (13).
2. independent cam engine brake device according to claim 1, is characterized in that described rocker compensating gear comprises adjustment bolt (8), elastic member, pressure ball (11); Adjust bolt (8) and be fixed in the through hole of exhaust rocker arm (1) end, the top of pressure ball is positioned at the bottom of this through hole, adjusts bolt (8) and is connected with pressure ball (11) by elastic member; And adjust between bolt (8) and pressure ball and leave gap; The bottom of pressure ball (11) and pressure ball seat (12) upper surface offset, and the bottom surface of pressure ball seat (12) and air valve bridge (13) offset.
3. independent cam engine brake device according to claim 1, is characterized in that described pitman arm shaft (2) inside is processed with normal open oil circuit (201) and the radial direction oil hole (202) of extending vertically.
4. independent cam engine brake device according to claim 3, is characterized in that being processed with radial direction oil hole (301) on the excentric sleeve of described eccentric swinging arm (3).
5. independent cam engine brake device according to claim 4, it is characterized in that being processed with on described exhaust rocker arm the first oilhole (101), this oilhole (101) communicates with installation through hole and the eccentric swinging arm hole of adjusting bolt (8), is processed with vertical oilhole (111) on pressure ball (11).
6. independent cam engine brake device according to claim 4, it is characterized in that being also processed with the second oilhole (102) on described exhaust rocker arm, this oilhole (102) communicates with the radial direction oil hole of eccentric swinging arm hole and pitman arm shaft (2).
7. independent cam engine brake device according to claim 1, is characterized in that described cylinder (15) is made up of cylinder block (151), return spring (152), stop collar (153), execution piston (154); The swing arm front end of eccentric swinging arm (3) is connected with the upper end of carrying out piston (154); Lower end, the return spring (152) of carrying out piston (154) are arranged in control valve body (151), stop collar (153) is fixed on the top of control valve body (151), and the lower air holes of control valve body (151) communicates with pressure system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410113623.XA CN103939172A (en) | 2013-12-27 | 2014-03-23 | Independent cam type engine braking device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310750998.2 | 2013-12-27 | ||
| CN201310750998 | 2013-12-27 | ||
| CN201410113623.XA CN103939172A (en) | 2013-12-27 | 2014-03-23 | Independent cam type engine braking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103939172A true CN103939172A (en) | 2014-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410113623.XA Pending CN103939172A (en) | 2013-12-27 | 2014-03-23 | Independent cam type engine braking device |
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| Country | Link |
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| CN (1) | CN103939172A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251147A (en) * | 2014-09-24 | 2014-12-31 | 中国第一汽车股份有限公司 | Independent-cam type engine braking device |
| CN107701255A (en) * | 2017-10-31 | 2018-02-16 | 潍柴动力股份有限公司 | A kind of valve early closes rocker arm body and a kind of engine |
| CN113187578A (en) * | 2021-05-31 | 2021-07-30 | 宁波东方动力部件有限公司 | Internal combustion engine in-cylinder brake device |
| CN115163239A (en) * | 2022-06-30 | 2022-10-11 | 中国第一汽车股份有限公司 | Variable valve lift mechanism, engine and vehicle |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09287427A (en) * | 1996-04-19 | 1997-11-04 | Jidosha Buhin Kogyo Kk | Engine brake device |
| CN101526018A (en) * | 2009-03-11 | 2009-09-09 | 浙江黎明发动机零部件有限公司 | Compression braking device of four-stroke cycle internal combustion engine |
| CN102383893A (en) * | 2011-11-09 | 2012-03-21 | 中国第一汽车股份有限公司 | Independent cam engine brake device |
| CN102691542A (en) * | 2011-03-24 | 2012-09-26 | 奚勇 | Engine brake device positioned by air valve rod |
| CN102733884A (en) * | 2011-03-30 | 2012-10-17 | 奚勇 | Integrated engine-braking device |
| CN103422932A (en) * | 2013-09-02 | 2013-12-04 | 中国第一汽车股份有限公司 | Independent cam type engine braking device |
| CN203891957U (en) * | 2013-12-27 | 2014-10-22 | 中国第一汽车股份有限公司 | Independent cam engine brake device |
-
2014
- 2014-03-23 CN CN201410113623.XA patent/CN103939172A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09287427A (en) * | 1996-04-19 | 1997-11-04 | Jidosha Buhin Kogyo Kk | Engine brake device |
| CN101526018A (en) * | 2009-03-11 | 2009-09-09 | 浙江黎明发动机零部件有限公司 | Compression braking device of four-stroke cycle internal combustion engine |
| CN102691542A (en) * | 2011-03-24 | 2012-09-26 | 奚勇 | Engine brake device positioned by air valve rod |
| CN102733884A (en) * | 2011-03-30 | 2012-10-17 | 奚勇 | Integrated engine-braking device |
| CN102383893A (en) * | 2011-11-09 | 2012-03-21 | 中国第一汽车股份有限公司 | Independent cam engine brake device |
| CN103422932A (en) * | 2013-09-02 | 2013-12-04 | 中国第一汽车股份有限公司 | Independent cam type engine braking device |
| CN203891957U (en) * | 2013-12-27 | 2014-10-22 | 中国第一汽车股份有限公司 | Independent cam engine brake device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251147A (en) * | 2014-09-24 | 2014-12-31 | 中国第一汽车股份有限公司 | Independent-cam type engine braking device |
| CN107701255A (en) * | 2017-10-31 | 2018-02-16 | 潍柴动力股份有限公司 | A kind of valve early closes rocker arm body and a kind of engine |
| CN107701255B (en) * | 2017-10-31 | 2024-05-17 | 潍柴动力股份有限公司 | Valve early-closing rocker arm mechanism and engine |
| CN113187578A (en) * | 2021-05-31 | 2021-07-30 | 宁波东方动力部件有限公司 | Internal combustion engine in-cylinder brake device |
| CN115163239A (en) * | 2022-06-30 | 2022-10-11 | 中国第一汽车股份有限公司 | Variable valve lift mechanism, engine and vehicle |
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Application publication date: 20140723 |