JP2001280494A - Engine sliding part and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide an engine sliding part having good oil retention and excellent seizure resistance and wear resistance. SOLUTION: The surface of a base material 14 serving as a sliding surface 12 of an engine sliding part is provided with undulations and micro dimple shapes, and a hard thin film 16 is formed on the base material surface, thereby achieving low friction. A sliding surface with good oil retention and excellent seizure resistance and wear resistance is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding part of an engine having excellent seizure resistance and abrasion resistance. The present invention relates to the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, engine sliding parts, such as shift forks, have been used in which carbon steel is induction hardened and polished with a grindstone, followed by hard Cr plating. Japanese Patent Application Laid-Open No. 56-16218 discloses a transmission for an automobile in which a sliding film of a shift fork made of aluminum or an aluminum alloy is formed with a hard film of porous hard aluminum oxide impregnated with a tetrafluoride resin. Shift fork is described.

Japanese Patent Application Laid-Open No. Sho 64-42580 discloses a steel shift fork having a matrix of nickel or a nickel-based alloy on an induction hardened layer and having a plating film in which ceramic fine particles are dispersed in the matrix. Has been described. Also, Japanese Patent Application Laid-Open No. 6-41721
Japanese Patent Application Laid-Open Publication No. H11-163873 discloses a sliding member in which a hard coating is formed by vapor deposition on a sliding member body having an uneven surface formed by using a combination of turning and grinding with lapping and polishing, and a method of manufacturing the same. Has been described. Conventionally, a hard thin film having higher hardness than hard Cr plating has been used. In this case, the surface on which the hard thin film is formed is mirror-finished.

[0004]

There are the following problems with respect to the above prior art. (1) With the increase in output of an internal combustion engine, the sliding conditions of engine sliding parts, for example, the sliding conditions of a shift fork and a gear, have become severe, and the conventional hard Cr plating has a limit in seizure resistance. . (2) In order to use a porous hard aluminum oxide film, a sliding component, for example, a shift fork must be formed of aluminum or an aluminum alloy, and there is a limit in improving the strength of the entire shift fork. Also, the porous hard aluminum oxide coating alone is insufficient in oil retention, and it is necessary to impregnate a self-lubricating tetrafluoride resin after the hard coating is formed in order to reduce friction. (3) In order to use plating using nickel or a nickel-based alloy as a matrix, it is necessary to use a mixture of hard ceramic fine particles such as SiC to improve friction resistance.
In addition, it is necessary to use solid lubricant particles such as BN in combination to reduce friction. (4) Since the hard thin film formed on the smooth surface has abrasion resistance but no oil retaining property, frictional resistance increases and seizure occurs. (5) The uneven surface formed by using lapping and polishing together has a flat surface, and the flat surface has no oil film holding ability, so that the oil retaining property is poor. (6) The hard coating formed on the rough surface causes the gear, which is the mating material, to be severely worn.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to form a hard thin film on a base material of a sliding surface of an engine sliding part, thereby achieving excellent seizure resistance and wear resistance. By forming a sliding surface and pre-swelling the base material of the sliding surface with undulations and micro-dimple shapes, it is possible to improve the oil-retaining property of the entire sliding surface and form a low-friction sliding surface. An engine that does not require compounding of impregnating material or fine particles into the coating to improve lubricity, simplifies the process of forming the surface shape, and has an appropriate surface shape to prevent the mating material from being worn. A sliding component and a method of manufacturing the same are provided.

[0006]

In order to achieve the above-mentioned object, an engine sliding component according to the present invention has a base and a sliding surface of the engine sliding component which have a waviness and a micro dimple shape. It is formed on a base material surface provided with a hard thin film on the base material surface to form a sliding surface having low friction, good oil retention, and excellent seizure resistance and wear resistance.

[0007] The hard thin film is formed of CrN, TiN, diamond-like carbon (DLC) or the like. Further, it is preferable that the undulation has a width of 200 to 400 μm and a height of 3 to 5 μm. In addition, the micro dimple is 0.2 to 2 μm.
It is preferable to configure so as to have m irregularities. Further, it is preferable that the hard thin film has a thickness of 1 to 10 μm. Also, the engine sliding part is a shift fork, the base material of which is made of carbon steel or low alloy steel, and whose sliding surface has a surface hardened layer formed by induction hardening, carburizing, nitriding or / and nitrocarburizing. It is preferable to configure so that This surface hardened layer is formed before a hard thin film is formed on the surface of the base material that becomes the sliding surface.

[0008] The method for manufacturing an engine sliding component according to the present invention comprises:
The surface of the substrate, which is the sliding surface of engine sliding parts, has undulations and micro-dimple shapes, and a hard thin film is formed on the surface of the substrate, resulting in low friction, good oil retention and good seizure resistance And a sliding surface having excellent wear resistance.

In this method, a hard thin film is formed by physical vapor deposition (PVD) or chemical vapor deposition (CVD).
In addition, the undulation is generated by shot peening, cutting, polishing, plastic working, or the like. In addition, micro dimples are generated by fine particle peening or the like. CrN, TiN and diamond-like carbon (D
LC) or the like. In addition, swell 200 to 40 width
Preferably, the thickness is 0 μm and the height is 3 to 5 μm. Also,
The micro dimple is 0.5 to 2 μm, preferably 0.1 μm.
It is preferable to have irregularities of 2 to 2 μm.
Preferably, the hard thin film has a thickness of 1 to 10 μm.

[0010] In order to improve the retention of the hard thin film, a method such as induction hardening, carburizing, nitriding, nitrocarburizing, etc., is applied before the hard thin film is formed on the surface of the base material which is the sliding surface of the engine sliding parts. To form a surface hardened layer on the substrate surface. As an example, the engine sliding component is a shift fork. In this case, it is preferable that the base material of the shift fork is made of carbon steel or low alloy steel in order to impart strength to the entire shift fork.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments and can be implemented with appropriate modifications. FIG. 1 is a plan view showing the shape of an engine sliding component, for example, a shift fork 10 according to a first embodiment of the present invention, and FIG. 2 is a plan view of a sliding surface 12 of the engine sliding component (for example, shift fork) shown in FIG. FIG. 2 is a schematic cross-sectional view, specifically, a part of an enlarged cross-sectional view of a sliding surface 12 in FIG.

In the shift fork 10, the sliding surface 1
2 slides on both sides of the gear. For this reason, seizure resistance, wear resistance, and low friction properties are required. A waviness shape and a micro dimple shape are formed in advance on the surface of the base material 14 which becomes the sliding surface 12 of the shift fork 10.
A hard thin film 16 is generated on the surface of the substrate. By doing so, it is possible to produce the sliding surface 12 having low friction, good oil retention, and excellent seizure resistance and wear resistance. Hard thin film 16
For example, CrN, TiN, diamond-like carbon (DLC), or the like is used, and is generated by PVD, CVD, or the like.

The undulation is shot peening, cutting,
It is formed by polishing or plastic working. Micro dimples are generated by fine particle peening or the like. In this way, the undulation having a large number of microdimples
4 is formed on the surface. The swell is 200-400μ in width
m and a height of 3 to 5 μm. The micro dimples are preferably formed to have irregularities of 0.2 to 2 μm (1 μm in FIG. 2 as an example).

The hard thin film 16 is preferably formed to have a thickness of 1 to 10 μm. Hard thin film 1
Before the hard thin film is formed on the sliding surface of the base material 14 in order to improve the retention of 6, the surface hardened layer is formed on the surface of the base material 14 by induction hardening, carburizing, nitriding, nitrocarburizing, or the like. Preferably, it is generated. In this case, there is an advantage that the retention of the hard thin film is further improved. Further, in order to impart strength to the entire shift fork 10, it is preferable that the base material 14 is made of carbon steel, low alloy steel, or the like.

As described above, the hard thin film 16, which is a hard coating, is formed. The hard thin film 16 is a thin film formed along the surface shape of the base material 14 and retains the surface shape and has abrasion resistance. In addition, the base material 14 needs to have hardness enough to hold the film by the base material surface or the surface hardened layer. In the above-described embodiment, the shift fork, which is one of the transmission components, has been described as an example of the engine sliding component. However, the present invention can also be applied to valve train components such as tappets and rocker arms.

[0016]

EXAMPLES Examples and comparative examples are shown below to further clarify the features of the present invention. Example 1 and Comparative Example 1 As a result of a high-load endurance test simulating an actual vehicle engine, a hard Cr-plated shift fork was placed on a flat surface.
A shift fork that produced a 3 µm CrN hard thin film on the surface with undulations and micro dimples burned after 2 hours, while a shift fork that produced a 3 µm CrN hard thin film produced seizure after 2 hours. Did not occur and good results were obtained. The undulation is 300μm wide,
The height was 5 μm. The micro dimple is 1μ
m.

[0017]

As described above, the present invention has the following effects. (1) Engine sliding parts with low friction, good oil retention, good seizure resistance and excellent wear resistance by forming a hard thin film on the base material of the sliding surface with undulation and micro dimple shape. Can be manufactured. That is, by providing the hard thin film with oil retaining properties in shape, it is possible to provide an engine sliding part having both seizure resistance and wear resistance. (2) When a hardened layer is formed on the surface of the base material before the hard thin film is formed, the retention of the hard thin film is further improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a shift fork as an example of an engine sliding component according to a first embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a part of a cross section of a sliding surface of the engine sliding component in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shift fork 12 Sliding surface 14 Substrate 16 Hard thin film

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C23C 8/46 C23C 8/46 8/50 8/50 8/66 8/66 F16J 9/26 F16J 9 / 26 C (72) Inventor Hyoe Ramino 1-1, Kawasaki-cho, Akashi-shi, Hyogo Prefecture Inside the Akashi factory of Kawasaki Heavy Industries, Ltd. (72) Inventor Ichiro Tanaka 1-1-1, Kawasaki-cho, Akashi-shi, Hyogo Inside the Akashi factory, Kawasaki (72) Inventor Takao Kusuura 1-1-1, Kawasaki-cho, Akashi-shi, Hyogo Prefecture Inside the Akashi Plant of Kawasaki Heavy Industries, Ltd. (Reference) 3J044 AA02 BB05 BB06 BB19 BB20 BB28 BB30 BB39 BC04 BC07 BC13 BC14 EA02 EA03 EA04 3J067 EA34 EA42 EA47 EA49 FB85 4K028 AA01 AA02 AB06 BA02 BA03 BA12

Claims (16)

[Claims] 1. A substrate surface to be a sliding surface of an engine sliding component is formed on a substrate surface having undulations and micro dimple shapes, and a hard thin film is provided on the substrate surface. An engine sliding part characterized by forming a sliding surface having low friction, good oil retention, and excellent seizure resistance and wear resistance. 2. The engine sliding part according to claim 1, wherein the hard thin film is formed of one of CrN, TiN, and diamond-like carbon. 3. The undulation has a width of 200 to 400 μm and a height of 3.
The engine sliding part according to claim 1 or 2, wherein the thickness of the engine sliding part is up to 5 µm. 4. The engine sliding part according to claim 1, wherein the micro dimples have irregularities of 0.2 to 2 μm. 5. The engine sliding part according to claim 1, wherein the hard thin film has a thickness of 1 to 10 μm. 6. The engine sliding component is a shift fork, the base material of which is made of carbon steel or low alloy steel, and induction hardening before forming a hard thin film on the surface of the base material to be the sliding surface. A carburized, carburized, nitrified and nitrocarburized at least one method of forming a surface hardened layer on the substrate surface.
6. The engine sliding part according to any one of 5 above. 7. A swelling and micro-dimple shape is provided on a surface of a base material serving as a sliding surface of an engine sliding component, and a hard thin film is formed on the base material surface to thereby provide low friction and oil retention. A method of manufacturing a sliding part for an engine, characterized by forming a sliding surface which is excellent in seizure resistance and wear resistance. 8. The method according to claim 7, wherein the hard thin film is formed by a physical vapor deposition method or a chemical vapor deposition method. 9. The method for manufacturing an engine sliding part according to claim 7, wherein the undulation is generated by at least one of shot peening, cutting, polishing and plastic working. 10. The method of manufacturing an engine sliding part according to claim 7, wherein the micro dimples are generated by fine particle peening. 11. The method according to claim 7, wherein one of CrN, TiN and diamond-like carbon is used as the hard thin film.
The method for manufacturing an engine sliding component according to any one of claims 10 to 10. 12. The method of manufacturing an engine sliding part according to claim 7, wherein the undulation has a width of 200 to 400 μm and a height of 3 to 5 μm. 13. The micro dimple has a diameter of 0.5 to 2 μm.
The method for manufacturing an engine sliding component according to any one of claims 7 to 12, which has irregularities. 14. The method for manufacturing an engine sliding part according to claim 7, wherein the hard thin film has a thickness of 1 to 10 μm. 15. In order to improve the retention of the hard thin film, at least one of induction hardening, carburizing, nitriding, and nitrocarburizing is performed before the hard thin film is formed on the surface of the base material serving as the sliding surface of the engine sliding component. The method for producing an engine sliding component according to any one of claims 7 to 14, wherein the surface hardened layer is formed on the substrate surface by any one of the methods. 16. A shift fork according to claim 7, wherein the engine sliding part is a shift fork, and a base material of the shift fork is made of carbon steel or low alloy steel in order to impart strength to the entire shift fork. A method for producing the engine sliding part according to the above.