CN112282887A - System for compression-release in-cylinder engine braking - Google Patents
System for compression-release in-cylinder engine braking Download PDFInfo
- Publication number
- CN112282887A CN112282887A CN202011236075.1A CN202011236075A CN112282887A CN 112282887 A CN112282887 A CN 112282887A CN 202011236075 A CN202011236075 A CN 202011236075A CN 112282887 A CN112282887 A CN 112282887A
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- CN
- China
- Prior art keywords
- valve
- cylinder
- upper half
- compression
- rocker arm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000006835 compression Effects 0.000 title claims abstract description 26
- 238000007906 compression Methods 0.000 title claims abstract description 26
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
Images
Classifications
-
- 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
- F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
Abstract
The invention discloses a system for braking an engine in a compression release cylinder, which comprises: valves, valve caps, and brake rockers. The valve cap includes: a lower half and an upper half. The lower half part is fixed above the air valve. The upper half part can be fixed above the lower half part in a multi-direction rotating manner. The brake rocker arm is fixed above the upper half part of the valve cap. When the brake rocker arm moves downwards, the brake rocker arm is contacted with the valve cap and moves the valve downwards, so that gas in the cylinder is discharged, and the engine is braked in the cylinder. Therefore, the system for braking the engine in the compression release type cylinder has a simple and reasonable structure, can reduce the transverse acting force transmitted to the valve by the braking rocker arm, and reduces the risks of eccentric wear and breakage of the valve guide pipe.
Description
Technical Field
The present invention relates to the field of engine technology, and more particularly to a compression release in-cylinder engine braking system.
Background
In order to obtain better braking performance of the whole vehicle, except for a braking system on the whole vehicle, an engine is generally provided with a braking system such as exhaust braking, in-cylinder braking and the like, wherein the compression release type in-cylinder braking principle is as follows: at the end of the compression stroke in the cylinder, the compressed gas in the cylinder is released, thus creating resistance to engine crankshaft rotation during the compression stroke and the next power stroke.
The existing cylinder braking device for releasing compressed air by jacking an air valve is characterized in that a through hole is formed in one side (right above the air valve) of an exhaust valve bridge, an air valve cap is arranged in the through hole, when an engine brakes in a non-cylinder, an exhaust rocker arm normally acts on the air valve bridge, when the engine brakes in the cylinder, the exhaust rocker arm acts on the air valve bridge, and another cylinder braking rocker arm acts on the air valve cap to control the opening and closing of the corresponding air valve, so that the purpose of releasing the compressed air in the air cylinder is achieved. However, the existing valve cap and the brake rocker arm are in point contact when being in contact, and the defects are that the transverse acting force of the brake rocker arm is easy to transmit, and after the valve is subjected to the transverse acting force, faults such as eccentric wear, breakage and the like of a valve guide pipe are easy to occur.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a system for braking an engine in a compression release type cylinder, which has a simple and reasonable structure, can reduce the transverse acting force transmitted to a valve by a brake rocker arm, and reduces the risks of eccentric wear and fracture of a valve guide pipe.
To achieve the above object, the present invention provides a system for compression-release in-cylinder braking an engine, comprising: valves, valve caps, and brake rockers. The valve cap includes: a lower half and an upper half. The lower half part is fixed above the air valve. The upper half part can be fixed above the lower half part in a multi-direction rotating manner. The brake rocker arm is fixed above the upper half part of the valve cap. When the brake rocker arm moves downwards, the brake rocker arm is contacted with the valve cap and moves the valve downwards, so that gas in the cylinder is discharged, and the engine is braked in the cylinder.
In one embodiment of the invention, the upper and lower portions of the valve cap are in spherical contact.
In an embodiment of the present invention, the upper half of the valve cap is provided with a through hole, and the through hole is used for allowing lubricating oil to enter the contact spherical surface between the upper half and the lower half.
In an embodiment of the invention, the through hole opens at the center of the upper half.
In one embodiment of the invention, the upper half and the lower half are both cylindrical structures.
In one embodiment of the invention, the lower half has a larger diameter than the upper half.
In an embodiment of the invention, the lower half part is internally provided with a hollow structure, and the size of the hollow structure is matched with that of the top structure of the air valve.
Compared with the prior art, the system for braking the engine in the compression release type cylinder has a simple and reasonable structure, can reduce the transverse acting force transmitted to the valve by the braking rocker arm, and reduces the risks of eccentric wear and breakage of the valve guide pipe.
Drawings
FIG. 1 is a schematic front view of a system for compression-release in-cylinder braking an engine according to an embodiment of the present invention;
FIG. 2 is a schematic front view illustration of a valve cap of a system for compression-release in-cylinder braking an engine according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a top view of a valve cap of a system for compression-release in-cylinder braking an engine according to an embodiment of the present invention;
fig. 4 is a schematic sectional view at a-a in fig. 3.
Description of the main reference numerals:
1-valve, 2-valve cap, 21-lower half, 22-upper half, 23-through hole, and 3-brake rocker.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
FIG. 1 is a schematic front view of a system for compression-release in-cylinder braking an engine according to an embodiment of the present invention. FIG. 2 is a schematic front view of a valve cap of a system for compression-release in-cylinder braking an engine according to an embodiment of the present invention. FIG. 3 is a schematic top view of a valve cap of a system for compression-release in-cylinder braking an engine according to an embodiment of the present invention. Fig. 4 is a schematic sectional view at a-a in fig. 3.
As shown in fig. 1 to 4, a system for in-cylinder braking an engine by compression release according to a preferred embodiment of the present invention comprises: valves, valve caps, and brake rockers. The valve cap includes: a lower half and an upper half. The lower half part is fixed above the air valve. The upper half part can be fixed above the lower half part in a multi-direction rotating manner. The brake rocker arm is fixed above the upper half part of the valve cap. When the brake rocker arm moves downwards, the brake rocker arm is contacted with the valve cap and moves the valve downwards, so that gas in the cylinder is discharged, and the engine is braked in the cylinder.
In one embodiment of the invention, the upper and lower portions of the valve cap are in spherical contact. The upper half part of the valve cap is provided with a through hole, and the through hole is used for allowing lubricating oil to enter a contact spherical surface between the upper half part and the lower half part.
In an embodiment of the invention, the through hole opens at the center of the upper half. The upper half part and the lower half part are both cylindrical structures. The diameter of the lower half is larger than the diameter of the upper half. The inside of the lower half portion is of a hollow structure, and the size of the hollow structure is matched with the size of the top structure of the air valve.
In practical application, the system for braking the engine in the compression release type cylinder comprises a valve cap, wherein the valve cap consists of an upper half part and a lower half part, the upper half part of the valve cap is directly contacted with a brake rocker arm to transmit the acting force of the brake rocker arm, the lower half part of the valve cap is contacted with a valve to transmit the stress of the upper half part of the valve cap to the valve, the upper half part is contacted with the lower half part through a spherical surface, and if the lower half part is fixed, the upper half part can rotate in multiple directions in a certain range. In order to make the two parts have good lubrication, a through hole is arranged in the middle of the upper half spherical surface of the valve cap, so that lubricating oil can enter the contact spherical surface between the two parts from the through hole. The valve cap is placed on the top of the valve stem (valve), when the brake rocker arm moves downwards, the rocker arm contacts with the valve cap and moves the valve downwards, so that the gas in the cylinder is discharged. The valve cap is used for transmitting the vertical pressing force of the brake rocker arm and reducing the transverse force applied to the valve.
In a word, the compression release type system for braking the engine in the cylinder has a simple and reasonable structure, can reduce the transverse acting force transmitted to the valve by the brake rocker arm, and reduces the risks of eccentric wear and fracture of the valve guide pipe.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. A system for compression-release in-cylinder braking of an engine, comprising:
an air valve;
a valve cap, the valve cap comprising:
the lower half part is fixed above the air valve; and
the upper half part can be fixed above the lower half part in a multi-direction rotating manner; and a brake rocker arm fixed above the upper half of the valve cap;
when the brake rocker arm moves downwards, the brake rocker arm is in contact with the valve cap and enables the valve to move downwards, so that gas in the cylinder is exhausted, and the engine is braked in the cylinder.
2. The compression-release, in-cylinder brake engine system as defined in claim 1, wherein there is spherical contact between said upper and lower halves of said valve cap.
3. The system of claim 2, wherein the upper half of the valve cap defines a through hole for oil to enter a contacting spherical surface between the upper half and the lower half.
4. A system for compression-release, in-cylinder braking an engine according to claim 3, wherein the through-hole opens at the center of the upper half.
5. A compression-release, in-cylinder brake engine system as set forth in claim 1, wherein said upper half and said lower half are of cylindrical configuration.
6. A compression-release, in-cylinder brake engine system as set forth in claim 1, wherein said lower half has a diameter greater than a diameter of said upper half.
7. A compression-release, in-cylinder brake engine system as set forth in claim 1 wherein the interior of the lower half is hollow and the dimensions of the hollow are adapted to the dimensions of the valve tip feature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011236075.1A CN112282887A (en) | 2020-11-09 | 2020-11-09 | System for compression-release in-cylinder engine braking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011236075.1A CN112282887A (en) | 2020-11-09 | 2020-11-09 | System for compression-release in-cylinder engine braking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112282887A true CN112282887A (en) | 2021-01-29 |
Family
ID=74351842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011236075.1A Pending CN112282887A (en) | 2020-11-09 | 2020-11-09 | System for compression-release in-cylinder engine braking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112282887A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640258A (en) * | 2016-12-28 | 2017-05-10 | 潍柴动力股份有限公司 | Engine compression release type braking system and engine |
| CN107636267A (en) * | 2015-05-18 | 2018-01-26 | 伊顿(意大利)有限公司 | Rocking arm with the oil drain valve as accumulator |
| CN213743573U (en) * | 2020-11-09 | 2021-07-20 | 广西玉柴机器股份有限公司 | System for compression-release in-cylinder engine braking |
-
2020
- 2020-11-09 CN CN202011236075.1A patent/CN112282887A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107636267A (en) * | 2015-05-18 | 2018-01-26 | 伊顿(意大利)有限公司 | Rocking arm with the oil drain valve as accumulator |
| CN106640258A (en) * | 2016-12-28 | 2017-05-10 | 潍柴动力股份有限公司 | Engine compression release type braking system and engine |
| CN213743573U (en) * | 2020-11-09 | 2021-07-20 | 广西玉柴机器股份有限公司 | System for compression-release in-cylinder engine braking |
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