CN116085087B - In-cylinder braking mechanism and method for engine - Google Patents
In-cylinder braking mechanism and method for engine Download PDFInfo
- Publication number
- CN116085087B CN116085087B CN202310212757.6A CN202310212757A CN116085087B CN 116085087 B CN116085087 B CN 116085087B CN 202310212757 A CN202310212757 A CN 202310212757A CN 116085087 B CN116085087 B CN 116085087B
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- Prior art keywords
- rocker arm
- piston
- engine
- sliding
- pushing piece
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
Abstract
The invention relates to an in-cylinder braking mechanism and a method for an engine, which belong to the technical field of engines and solve the problem that the braking clearance of the in-cylinder braking mechanism for the engine is inconvenient to adjust.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an in-cylinder braking mechanism and method of an engine.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The existing in-cylinder brake mechanism of the engine solves the defects of the existing hydraulic in-cylinder brake, for example, patent CN115355071A discloses an in-cylinder brake mechanism and method of the engine, patent CN102261283B discloses a fixed chain engine brake device, the technology does not adopt liquid to bear brake load and is not influenced by oil temperature, oil pressure and air content, but the technology is of a piston telescopic structure, a brake gap, namely, a gap between a piston end part and a valve ejector rod is difficult to adjust, the in-cylinder brake valve lift of the engine is very small, generally about 2 mm, the gap size directly influences the in-cylinder brake effect, if the gap is too small, the valve gap after the heat engine is too small to be closed, if the gap is too large, the valve opening time lag is caused, the lift is reduced, the braking force is too large, and the reliability of parts is reduced. The CN115355071a patent uses a stepped pad for brake lash adjustment, which is cumbersome to operate due to space constraints. The problem of difficulty in adjusting the braking gap also exists in the patent CN102261283B, and the threaded connection can output linear motion, which is a relatively convenient and quick gap distance adjusting method, but if the piston in the above technology adopts the threaded connection, the piston cannot realize expansion and contraction, and the switching of braking and releasing functions cannot be satisfied, so the method of adjusting the distance by the threaded connection is not suitable for the existing in-cylinder braking mechanism of the engine.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an in-cylinder braking mechanism of an engine, which can realize the adjustment of a braking gap by utilizing threaded connection and is convenient and quick to adjust the braking gap.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides an in-cylinder brake mechanism for an engine, including a rocker arm rotationally connected to a rocker arm shaft, one end of the rocker arm being a power input end, the other end being a power output end, the rocker arm being provided with a sliding chamber at the power output end, an axis of the sliding chamber being parallel to an axis of the rocker arm shaft, a piston being provided in the sliding chamber, the piston being threadedly connected with a pushing member having a bottom end extending below the rocker arm, the piston being slidably connected in the sliding chamber to achieve switching between a centered and staggered state of the pushing member and a valve lift rod.
Optionally, the piston top is provided with the constant head tank, is provided with the slider in the constant head tank, and the slider is through seting up the guide way and rocking arm sliding connection at the rocking arm, and the slider top is equipped with the retaining member of being connected with the pushing away piece, and the retaining member compresses tightly at the upper surface of slider.
Optionally, the pushing component adopts an adjusting screw, the axis of the adjusting screw is vertical to the axis of the sliding cavity, and the locking component adopts a locking nut in threaded connection with the adjusting screw.
Optionally, the sliding cavity inner space is communicated with a sealing oil way to realize the movement of the piston along the sliding cavity by utilizing hydraulic oil, a first return spring is arranged between the piston and the rocker arm to realize the reset, and the sealing oil way is arranged on the rocker arm and/or the rocker arm shaft.
Optionally, the piston includes first piston portion and second piston portion, and the diameter of second piston portion is less than the diameter of first piston portion, and the pushing piece is connected to first piston portion, and the sliding chamber inner space of its one side communicates with sealed oil circuit.
Optionally, the second piston portion extends to the outside of the rocker arm, and a first return spring is arranged between the portion, extending to the outside of the rocker arm, of the second piston portion and the rocker arm.
Optionally, a sealing ring is arranged between the second piston part and the rocker arm.
Optionally, the power input end of rocking arm is equipped with the gyro wheel, gyro wheel and cam contact, is equipped with the second return spring between the power input end of rocking arm and the fixed spring support that sets up so that gyro wheel and cam contact all the time.
Optionally, the end surface of the pushing piece, which is used for being in contact with the valve ejector rod, is a spherical surface.
In a second aspect, an embodiment of the present invention provides a method of the in-cylinder brake mechanism of the engine of the first aspect, including the steps of:
when braking is prepared, the piston moves along the sliding cavity, so that the pushing piece is centered with the valve ejector rod, the rocker rotates, the valve ejector rod is driven to move by the pushing piece, and then the exhaust valve is driven to move, so that braking is realized;
the piston moves along the sliding cavity, so that the pushing piece is staggered with the valve ejector rod, the rocker cannot drive the valve ejector rod to move through the pushing piece, and the braking state is relieved.
The beneficial effects of the invention are as follows:
1. according to the in-cylinder braking mechanism, the piston moves along the sliding cavity to realize the switching between the centering and staggering states of the pushing piece and the valve ejector rod, and further realize the switching between the braking and releasing states.
2. According to the in-cylinder braking mechanism, the sliding position of the piston can be limited by arranging the guide groove and the sliding block, so that the pushing piece can be accurately centered with the valve ejector rod.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic view showing the overall structure of embodiment 1 of the present invention;
FIG. 2 is a schematic diagram showing a braking state according to embodiment 2 of the present invention;
FIG. 3 is a top view showing a braking state according to embodiment 2 of the present invention;
FIG. 4 is a schematic view showing a brake release state according to embodiment 2 of the present invention;
wherein, the valve is 1, the valve ejector rod is 2, the valve bridge is 3, the adjusting screw is 4, the piston is 5, the sliding block is 6, the locking nut is 7, the second sealing oil path is 8, the rocker arm is 9, the first sealing oil path is 10, the spring support is 11, 12, a second return spring, 13, a roller, 14, a roller pin, 15, a cam, 16, a sliding bearing, 17, a rocker shaft, 18, a sealing ring, 19, a retainer ring, 20, a gasket and 21, and a first return spring;
9-1, guiding groove, 9-2, second groove surface, 9-3 and first groove surface.
Detailed Description
For convenience of description, the words "upper" and "lower" in the present invention, if they mean only the directions of the words corresponding to the upper and lower directions of the drawings, are not limited to the directions, but are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be 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.
Example 1
The present embodiment provides an in-cylinder brake mechanism for an engine, as shown in fig. 1, including a rocker arm 9, the non-end position of the rocker arm 9 is rotatably connected to a rocker arm shaft 17 through a slide bearing 16, the rocker arm 9 is rotatable in a rotation plane about the axis of the rocker arm shaft 17, and the rocker arm shaft 17 is fixedly provided.
And the rocker arm shaft 17 is used as a boundary, one end of the rocker arm 9 is used as a power input end, the other end of the rocker arm 9 is used as a power output end, a sliding cavity is arranged at the power output end, and the axis of the sliding cavity is parallel to the axis of the rocker arm shaft, namely, is perpendicular to the rotation plane of the rocker arm.
The sliding cavity is internally provided with a piston 5 coaxially arranged with the sliding cavity, the piston 5 is in sliding connection with the sliding cavity, and the piston 5 can do linear reciprocating motion along the axis of the sliding cavity.
In this embodiment, the piston 5 has a cylindrical structure, and thus the sliding chamber has a cylindrical shape, and in other embodiments, the piston has a cubic structure, and correspondingly, the sliding chamber has a cubic shape.
The upper part and the lower part of the sliding cavity are respectively provided with a guide groove 9-1, the guide grooves 9-1 are communicated with the sliding cavity, the guide grooves 9-1 above extend to the top surface of the rocker arm 9, the guide grooves 9-1 below extend to the bottom surface of the rocker arm 9, and the long axes of the guide grooves 9-1 are parallel to the axes of the sliding cavity.
In this embodiment, the two groove surfaces of the guide groove 9-1 along the long axis direction are a first groove surface 9-3 and a second groove surface 9-2, respectively, for limiting the movement of the piston 5.
The piston 5 is connected with a pushing piece, the axis of the pushing piece is perpendicular to the axis of the piston 5 and the axis of the interaction cavity, the bottom end of the pushing piece extends to the lower side of the rocker arm through a lower guide groove 9-1, and the top end of the pushing piece extends to the upper side of the rocker arm through an upper guide groove 9-1.
In this embodiment, the pushing member adopts the adjusting screw 4, the bottom surface of the adjusting screw 4 is used for contacting with the valve ejector rod 2, and in order to avoid damage to the valve ejector rod 2, the bottom surface of the adjusting screw 4 is a spherical surface.
The adjusting screw 4 is in threaded connection with the piston 5, and the distance from the bottom end of the adjusting screw to the lower side of the rocker arm can be adjusted by rotating the adjusting screw, namely, the distance between the bottom end of the adjusting screw and the top end of the valve ejector rod 2 is adjusted, further, the adjustment of a braking gap is realized, and the adjustment mode is convenient and quick.
The top of the piston 5 is provided with a positioning groove, a sliding block 6 is placed in the positioning groove, and the sliding block 6 is in sliding connection with the rocker arm 9 through a guide groove 9-1 above, so that a guiding effect is achieved on the movement of the piston 5.
Through setting up guide slot 9-1 and slider 6, can also carry out spacing to the sliding position of piston 5, guarantee that the ejector can realize accurate centering with valve ejector pin 2
The slider 6 top is provided with the retaining member, and the retaining member adopts lock nut 7, and lock nut 7 and adjusting screw 4 threaded connection, lock nut 7 compress tightly at slider 6 upper surface to realize slider 6's fixed.
In this embodiment, the piston 5 includes a first piston portion and a second piston portion, the diameter of the first piston portion matches the diameter of the sliding cavity, and the diameter of the first piston portion is larger than the diameter of the second piston portion.
The first piston part is in threaded connection with an adjusting screw 4 and a sliding block 6, and the second piston part extends to the outer side of the rocker arm 9.
In this embodiment, the sliding chamber inner space of the first piston portion located at one side of the second piston portion communicates with the seal oil passage.
The sealing oil way is arranged on the rocker arm and/or the rocker arm shaft.
In this embodiment, the rocker arm shaft and the sliding bearing are provided with sealing oil paths, wherein the width of the sealing oil path on the sliding bearing is larger than the widths of the sealing oil paths on the rocker arm and the rocker arm shaft, so that when the rocker arm rotates within a set angle range, the first sealing oil path 10 on the rocker arm shaft can be always communicated with the second sealing oil path 8 on the rocker arm through the sealing oil path on the sliding bearing, the second sealing oil path 8 on the rocker arm is communicated with the inner space of the sliding cavity on one side of the first piston part, the first sealing oil path 10 on the rocker arm shaft 17 is connected with the oil supply system through an electromagnetic valve, and the sealing oil path on the rocker arm shaft is connected with the oil supply system because the rocker arm shaft is fixedly arranged and is convenient to be connected with the oil supply system.
In this embodiment, the sliding chamber extends to one side face of the rocker arm 9, so that one end of the sliding chamber is opened, the other end of the sliding chamber is closed, a channel for the second piston part to pass through is formed in the closed end, by adopting the arrangement mode, the processing of the sliding chamber and the installation of the piston 5 are facilitated, and correspondingly, in order to prevent the oil leakage of the sliding chamber at the open side, the first piston part of the piston 5 is in sealing sliding connection with the cavity face of the sliding chamber through the sealing ring.
The second piston part stretches out to the rocking arm 9 outside through the passageway that the blind end of sliding chamber was seted up, be provided with sealing washer 18 between second piston part and the rocking arm, and the second piston part stretches out to the outside tip of rocking arm 9 and be fixed with retaining ring 19 through the retaining ring groove, the inboard of retaining ring 19 is equipped with cup joints the packing ring 20 of fixing at second piston part periphery, be provided with first return spring 21 between packing ring 20 and the rocking arm 9, first return spring 21 cover is in second piston part periphery, its one end is fixed with rocking arm 9, the other end is fixed with packing ring 20, first return spring 21 can drive the motion of the blind end of first piston part towards the sliding chamber, realize the reset of piston 5.
The power input end of the rocker arm 9 is connected with a roller 13 through a roller pin shaft 14, the roller 13 is in contact with a rotatable cam 15, the power input end of the rocker arm 9 is connected with one end of a second return spring 12, the other end of the second return spring 12 is connected with a spring support 11, and the roller 13 can be always in contact with the cam 15 through the arrangement of the second return spring 12.
The cam 15 rotates, and the rocker arm can be driven to rotate around the rocker arm shaft by the roller.
Example 2
The present embodiment provides a method of an in-cylinder brake mechanism of an engine as set forth in embodiment 1, comprising the steps of:
as shown in fig. 2-3, when the brake is ready, the oil supply channel of the electromagnetic valve connected with the sealing channel is opened, the oil return channel is closed, hydraulic oil enters the sliding cavity through the sealing channel, the piston 5 is driven to move towards the direction of the sliding cavity away from the closed end, when the sliding block contacts with the first groove surface 9-3 of the guide groove 9-1 above the sliding block 6, the piston stops moving, at the moment, the adjusting screw 4 is centered with the valve ejector rod 2, the valve ejector rod is matched with the valve bridge 3, the cam 15 rotates, the rocker arm 9 can be driven to rotate through the roller 13, and then the exhaust valve 1 is driven to move through the adjusting screw 4 and the valve ejector rod 2, so that the brake is realized.
As shown in fig. 4, the oil supply path of the electromagnetic valve is closed, the oil return path is opened, the piston 5 moves towards the closed end of the sliding cavity under the action of the first return spring 21, when the sliding block 6 contacts with the second groove surface 9-2 opposite to the first groove surface 9-3 of the upper guide groove, the piston 5 stops moving, the adjusting screw 4 and the valve ejector rod 2 are staggered, at the moment, the cam 15 rotates and can not drive the exhaust valve 1 to move through the roller 13, the rocker 9 and the adjusting screw 4, and the braking state is released.
In this embodiment, the solenoid valve may be an existing two-position three-way solenoid valve, and the oil supply path and the oil return path in the two-position three-way solenoid valve are both connected with the sealed oil path, so that the oil supply state and the oil return state can be switched by controlling the two-position three-way solenoid valve, and the oil supply and oil return technology may be the existing technology and is not described in detail herein.
According to the in-cylinder braking mechanism, the piston 5 moves along the sliding cavity, so that the centering and staggering states of the pushing piece and the valve ejector rod 2 are switched, and further the braking and releasing states are switched.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (7)
1. The in-cylinder braking mechanism of the engine comprises a rocker arm (9) rotationally connected with a rocker arm shaft (17), wherein one end of the rocker arm (9) is used as a power input end, and the other end of the rocker arm is used as a power output end;
the bottom end of the pushing piece extends out to the lower part of the rocker arm through a guide groove below the rocker arm (9), and the top end of the pushing piece extends out to the upper part of the rocker arm through a guide groove above the rocker arm (9);
the top of the piston (5) is provided with a positioning groove, a sliding block (6) is arranged in the positioning groove, the sliding block (6) is in sliding connection with the rocker arm (9) through a guide groove (9-1) arranged on the rocker arm (9), a locking piece connected with a pushing piece is arranged above the sliding block (6), and the locking piece is tightly pressed on the upper surface of the sliding block (6);
the pushing part adopts an adjusting screw rod (4), the axis of the adjusting screw rod (4) is vertical to the axis of the sliding cavity, and the locking part adopts a locking nut (7) in threaded connection with the adjusting screw rod (4);
the sliding cavity is characterized in that the inner space of the sliding cavity is communicated with a sealing oil way to enable the piston to move along the sliding cavity by means of hydraulic oil, a first return spring (21) is arranged between the piston (5) and the rocker arm (9) to enable the piston to reset, and the sealing oil way is formed in the rocker arm (9) and/or the rocker arm shaft (17).
2. An in-cylinder brake mechanism for an engine as claimed in claim 1, wherein the piston (5) includes a first piston portion and a second piston portion, the second piston portion having a smaller diameter than the first piston portion, the first piston portion being connected to the urging member, and a sliding chamber inner space on one side thereof being in communication with the sealed oil passage.
3. An in-cylinder brake mechanism for an engine as claimed in claim 2, characterized in that the second piston part extends outside the rocker arm (9), and that a first return spring (21) is provided between the part of the second piston part extending outside the rocker arm (9) and the rocker arm (9).
4. An in-cylinder brake mechanism for an engine as claimed in claim 3, characterized in that a sealing ring (18) is arranged between the second piston part and the rocker arm (9).
5. An in-cylinder engine brake mechanism according to claim 1, characterized in that the power input end of the rocker arm (9) is provided with a roller (13), the roller (13) is in contact with the cam (15), and a second return spring (12) is provided between the power input end of the rocker arm (9) and the fixedly arranged spring support (11) so that the roller (13) is always in contact with the cam (15).
6. An in-cylinder brake mechanism for an engine as claimed in claim 1, wherein the end surface of the urging member for contacting the valve lifter (2) is spherical.
7. A method of an in-cylinder brake mechanism for an engine as claimed in any one of claims 1 to 6, comprising the steps of:
when braking is prepared, the piston (5) moves along the sliding cavity, so that the pushing piece is centered with the valve ejector rod (2), the rocker arm (9) rotates, the valve ejector rod (2) is driven to move by the pushing piece, and then the exhaust valve (1) is driven to move, so that braking is realized;
the piston (5) moves along the sliding cavity, so that the pushing piece is staggered with the valve ejector rod (2), the rocker arm (9) cannot drive the valve ejector rod (2) to move through the pushing piece, and the braking state is relieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310212757.6A CN116085087B (en) | 2023-03-08 | 2023-03-08 | In-cylinder braking mechanism and method for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310212757.6A CN116085087B (en) | 2023-03-08 | 2023-03-08 | In-cylinder braking mechanism and method for engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116085087A CN116085087A (en) | 2023-05-09 |
| CN116085087B true CN116085087B (en) | 2023-07-18 |
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ID=86210337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310212757.6A Active CN116085087B (en) | 2023-03-08 | 2023-03-08 | In-cylinder braking mechanism and method for engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN116085087B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101049594B1 (en) * | 2009-07-31 | 2011-07-14 | 기아자동차주식회사 | Compression Relief Engine Brake Module |
| CN201513209U (en) * | 2009-08-31 | 2010-06-23 | 上海尤顺汽车部件有限公司 | Engine braking device with low manufacturing cost |
| BR112014006435B1 (en) * | 2011-09-21 | 2021-06-22 | Jacobs Vehicle Systems, Inc. | SYSTEMS FOR ACTIVATING AN ENGINE VALVE TO DECOMPRESS AN ENGINE CYLINDER OR PERFORM ENGINE BLEED BRAKING |
| CN106640258B (en) * | 2016-12-28 | 2019-05-28 | 潍柴动力股份有限公司 | A kind of engine compresses release type braking system and engine |
| CN110925045A (en) * | 2019-12-30 | 2020-03-27 | 上海曼松科技中心 | Hydraulically-controlled engine brake actuating mechanism and application method thereof |
| CN115355071B (en) * | 2022-10-24 | 2023-02-10 | 龙口中宇热管理系统科技有限公司 | In-cylinder brake mechanism and method for engine |
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2023
- 2023-03-08 CN CN202310212757.6A patent/CN116085087B/en active Active
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