CN110847996A - Light titanium alloy composite material rocker arm for engine - Google Patents
Light titanium alloy composite material rocker arm for engine Download PDFInfo
- Publication number
- CN110847996A CN110847996A CN201910974214.1A CN201910974214A CN110847996A CN 110847996 A CN110847996 A CN 110847996A CN 201910974214 A CN201910974214 A CN 201910974214A CN 110847996 A CN110847996 A CN 110847996A
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- CN
- China
- Prior art keywords
- titanium alloy
- rocker arm
- embedded steel
- arm body
- steel sheet
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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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
Abstract
The invention provides a light titanium alloy composite rocker arm for an engine, which comprises an embedded steel ring, a titanium alloy rocker arm body and an embedded steel sheet, wherein the titanium alloy rocker arm body is formed by titanium alloy casting, a diamond-like carbon (DLC) film is coated at a roller pin hole of the titanium alloy rocker arm body, and the embedded steel ring and the embedded steel sheet are respectively arranged in friction areas at the left end and the right end of the titanium alloy rocker arm body and are formed by embedding and casting with the titanium alloy rocker arm body. The rocker arm in the engine valve actuating mechanism adopts a titanium alloy composite material scheme, the embedded steel ring and the embedded steel sheet which are cast in an embedding mode are made of alloy steel materials, and the surfaces of the embedded steel ring and the embedded steel sheet are hardened, so that the wear resistance is improved. The surfaces of the embedded steel ring and the embedded steel sheet are subjected to high-frequency quenching treatment, and a diamond-like carbon Diamond (DLC) film is coated at a pin hole of a middle roller of the rocker arm, so that the wear resistance of a friction area of the rocker arm is improved, the reliability of high-speed movement of the rocker arm is ensured, and an important support is provided for realizing the light-weight design of a high-power-density engine.
Description
Technical Field
The invention belongs to the technical field of internal combustion engines, and particularly relates to a light titanium alloy composite rocker arm for an engine.
Background
At present, high power density engines are active in the internal combustion engine research field at home and abroad. Along with the improvement of the strengthening degree of the internal combustion engine, the engine is required to have large power, small volume and light weight, the valve mechanism is used as an important motion component in the air exchange process of the engine, and the critical rotating speed and high-speed running performance of the engine are restricted by the design influence of the rocker arm. Therefore, it is desirable to provide a rocker arm structure that solves the problem of lightweight design of high power density engine valve trains.
Disclosure of Invention
In view of the above, the invention aims to provide a light titanium alloy composite rocker arm for an engine, which solves the problem of light weight design of a valve mechanism of a high-power-density engine and ensures wear resistance.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a light titanium alloy composite rocker arm for an engine comprises an embedded steel ring, a titanium alloy rocker arm body and an embedded steel sheet, wherein the titanium alloy rocker arm body is formed by titanium alloy casting, a diamond-like carbon (DLC) film is coated at a roller pin hole of the titanium alloy rocker arm body, and the embedded steel ring and the embedded steel sheet are respectively arranged in friction areas at the left end and the right end of the titanium alloy rocker arm body and are formed by insert casting with the titanium alloy rocker arm body.
Furthermore, the titanium alloy rocker arm body is made of a light cast titanium alloy material Ti6Al4V with the material density of 4.5 multiplied by 103kg/m3The tensile strength range is more than or equal to 1030MPa, the yield strength range is more than or equal to 910MPa, and the elongation after fracture range is more than or equal to 8 percent.
Furthermore, the surface of a roller pin hole of the titanium alloy rocker arm body is coated with a tungsten-doped diamond-like carbon DLC film to form WC microcrystals, the hardness range is more than or equal to the HRC50 coating thickness range and is 1.0-2.5 mu m, and the hardness is HV 2200-2700.
Further, the embedded steel ring is made of 42CrMo material, and is subjected to surface quenching treatment, wherein the surface hardness is HRC 56-60.
Furthermore, the embedded steel sheet is made of 42CrMo material, and is subjected to surface quenching treatment, wherein the surface hardness is HRC 56-60.
Compared with the prior art, the invention has the following advantages:
the rocker arm in the engine valve train adopts a titanium alloy composite material scheme, the body adopts a titanium alloy material Ti6Al4V, the embedded steel ring and the embedded steel sheet which are cast in an embedding way adopt an alloy steel material, and the surfaces of the embedded steel ring and the embedded steel sheet are hardened, so that the wear resistance is improved. The titanium alloy material adopted by the rocker arm body effectively reduces inertia by 30%, the surfaces of the embedded steel ring and the embedded steel sheet are subjected to high-frequency quenching treatment, and a diamond-like carbon Diamond (DLC) film is coated at a pin hole of a middle roller of the rocker arm, so that the wear resistance of a friction area of the rocker arm is improved, the reliability of high-speed motion of the rocker arm is ensured, and meanwhile, an important support is provided for realizing the light-weight design of a high-power-density engine.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a lightweight titanium alloy composite rocker arm for an engine according to an embodiment of the invention;
fig. 2 is a schematic diagram of an engine overhead cam valve train.
Description of reference numerals:
1 embedded steel ring, 2 titanium alloy rocker arm body, 3 embedded steel sheet, 4 exhaust camshaft, 5 finger-shaped hydraulic tappet, 6 rocker arms, 7 rollers, 8 exhaust valves, 9 intake valves, 10 valve springs, 11 spring discs and 12 intake camshaft.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
For simplicity of explanation, the embodiment of the present invention is described by taking the application of the rocker arm 6 to a certain inline three-cylinder engine as an example, and as shown in fig. 2, the installation arrangement of the rocker arm 6 in the valve train of the internal combustion engine is described. The exhaust camshaft 4 and the intake camshaft 12 drive the exhaust valve 8 and the intake valve 9 to move downwards through the roller 7 and the rocker arm 6, and the valve spring 10 pushes the exhaust valve 8 and the intake valve 9 to return through the spring disc 11.
In the working process of the internal combustion engine, the camshaft drives the valve to move vertically downwards through the roller 7 and the rocker arm 6, the valve spring 10 has enough rigidity and pretightening force to push the valve to return to close, the reasonable design of the cam and the valve spring 10 can keep the valve from flying off and bouncing in the moving process, wherein the valve spring 10 needs to have enough margin to bear the valve inertia load under high-speed movement, and the weight-reducing and wear-resisting reliability optimization design of the rocker arm 6 is an important component of a high-speed engine valve mechanism system.
The light titanium alloy composite material rocker arm for the engine of the embodiment comprises an embedded steel ring 1, a titanium alloy rocker arm body 2 and an embedded steel sheet 3 as shown in figure 1,
the titanium alloy rocker arm body 2 is formed by titanium alloy casting, a diamond-like carbon (DLC) film is coated at a roller pin hole of the titanium alloy rocker arm body 2, and the embedded steel ring 1, the embedded steel sheet 3 and the titanium alloy rocker arm body 2 are formed by insert casting.
The titanium alloy rocker arm body 2 is made of a light cast titanium alloy material Ti6Al4V with the material density of 4.5 multiplied by 103kg/m3The tensile strength range is more than or equal to 1030MPa, the yield strength range is more than or equal to 910MPa, and the elongation after fracture range is more than or equal to 8 percent.
The surface of a roller pin hole of the titanium alloy rocker arm body 3 is coated with a tungsten-doped diamond-like carbon DLC film to form WC microcrystals, the hardness range is more than or equal to HRC50, the coating thickness range is 1.0-2.5 mu m, and the hardness is HV 2200-2700.
The embedded steel ring 1 is made of 42CrMo material, and is subjected to surface quenching treatment, wherein the surface hardness is HRC 56-60.
The embedded steel sheet 3 is made of 42CrMo material, and is subjected to surface quenching treatment, wherein the surface hardness is HRC 56-60.
The light titanium alloy composite material rocker arm can ensure the strength and the wear resistance while being designed in a light weight manner, and meets the design requirements of high rotating speed, high load and light weight of a high-power-density engine.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The utility model provides a light titanium alloy combined material rocking arm for engine which characterized in that: comprises an embedded steel ring (1), a titanium alloy rocker arm body (2) and an embedded steel sheet (3),
the titanium alloy rocker arm body (2) is formed by titanium alloy casting, a diamond-like carbon DLC film is coated at a roller pin hole of the titanium alloy rocker arm body (2), and the embedded steel ring (1) and the embedded steel sheet (3) are respectively arranged in friction areas at the left end and the right end of the titanium alloy rocker arm body (2) and are formed by insert casting with the titanium alloy rocker arm body (2).
2. The lightweight titanium alloy composite material rocker arm for the engine according to claim 1, characterized in that: the titanium alloy rocker arm body (2) is made of a light cast titanium alloy material Ti6Al4V, and the material density is 4.5 multiplied by 103kg/m3The tensile strength range is more than or equal to 1030MPa, the yield strength range is more than or equal to 910MPa, and the elongation after fracture range is more than or equal to 8 percent.
3. The lightweight titanium alloy composite material rocker arm for the engine according to claim 1, characterized in that: the surface of a roller pin hole of the titanium alloy rocker arm body (2) is coated with a tungsten-doped diamond-like carbon DLC film to form WC microcrystals, the hardness range is more than or equal to HRC50, the coating thickness range is 1.0-2.5 mu m, and the hardness is HV 2200-2700.
4. The lightweight titanium alloy composite material rocker arm for the engine according to claim 1, characterized in that: the embedded steel ring (1) is made of 42CrMo material, and is subjected to surface quenching treatment, wherein the surface hardness is HRC 56-60.
5. The lightweight titanium alloy composite material rocker arm for the engine according to claim 1, characterized in that: the embedded steel sheet (3) is made of 42CrMo material, and is subjected to surface quenching treatment, wherein the surface hardness is HRC 56-60.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910974214.1A CN110847996A (en) | 2019-10-14 | 2019-10-14 | Light titanium alloy composite material rocker arm for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910974214.1A CN110847996A (en) | 2019-10-14 | 2019-10-14 | Light titanium alloy composite material rocker arm for engine |
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| Publication Number | Publication Date |
|---|---|
| CN110847996A true CN110847996A (en) | 2020-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910974214.1A Pending CN110847996A (en) | 2019-10-14 | 2019-10-14 | Light titanium alloy composite material rocker arm for engine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1776201A (en) * | 2004-11-17 | 2006-05-24 | 光洋精工株式会社 | Rocker arm bearing |
| JP2010270608A (en) * | 2009-05-19 | 2010-12-02 | Honda Motor Co Ltd | Titanium alloy constituent member and method for manufacturing the same |
| CN202031668U (en) * | 2011-05-03 | 2011-11-09 | 浙江易邦机械有限公司 | Rocker arm part of air inlet door |
| CN107654269A (en) * | 2017-09-12 | 2018-02-02 | 台州威德隆机械有限公司 | A kind of wear-resistant automobile rocker |
| CN108374704A (en) * | 2017-02-01 | 2018-08-07 | 通用汽车环球科技运作有限责任公司 | The effective teeter member of quality |
-
2019
- 2019-10-14 CN CN201910974214.1A patent/CN110847996A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1776201A (en) * | 2004-11-17 | 2006-05-24 | 光洋精工株式会社 | Rocker arm bearing |
| JP2010270608A (en) * | 2009-05-19 | 2010-12-02 | Honda Motor Co Ltd | Titanium alloy constituent member and method for manufacturing the same |
| CN202031668U (en) * | 2011-05-03 | 2011-11-09 | 浙江易邦机械有限公司 | Rocker arm part of air inlet door |
| CN108374704A (en) * | 2017-02-01 | 2018-08-07 | 通用汽车环球科技运作有限责任公司 | The effective teeter member of quality |
| CN107654269A (en) * | 2017-09-12 | 2018-02-02 | 台州威德隆机械有限公司 | A kind of wear-resistant automobile rocker |
Non-Patent Citations (1)
| Title |
|---|
| （日）高分子学会: "《塑料加工原理及实用技术》", 31 October 1991 * |
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Application publication date: 20200228 |
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