阅读说明：本技术 一种发动机用轻质钛合金复合材料摇臂 (Light titanium alloy composite material rocker arm for engine ) 是由 郝勇刚 白军爱 邓玉林 李元石 王旭兰 李旭东 徐广辉 于 2019-10-14 设计创作，主要内容包括：本发明提供了一种发动机用轻质钛合金复合材料摇臂,包括嵌入钢环、钛合金摇臂本体和嵌入钢片,所述钛合金摇臂本体为钛合金铸造成型,所述钛合金摇臂本体的滚轮销孔处涂敷涂层类金刚石DLC薄膜,所述嵌入钢环和嵌入钢片分别设置在钛合金摇臂本体左右两端的摩擦区域,均与钛合金摇臂本体采用镶铸成型。本发明发动机配气机构中的摇臂采用钛合金的复合材料方案,镶铸的嵌入钢环与嵌入钢片采用合金钢质材料且表面进行硬化处理,提高耐磨性能。嵌入钢环与嵌入钢片表面进行高频淬火处理,摇臂中间滚轮销孔处涂敷类金刚石DLC薄膜,提高了摇臂摩擦区域的耐磨性能,保证了摇臂高速运动的可靠性,同时为实现高功率密度发动机的轻量化设计提供了重要支撑。(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.)

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.

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.