TWI750068B - Chain with toothed links - Google Patents

Abstract

A chain containing tooth-shaped chain pieces, including several pieces of chain pieces and several chain shafts. Each chain piece includes a chain piece body and a molybdenum disulfide layer formed outside the chain piece body and mainly composed of molybdenum disulfide. The chain shafts and the chain pieces are assembled together to form the chain in cooperation. Each chain shaft includes a shaft core portion and an outer shaft portion surrounding the shaft core portion. Among them, based on the total weight of each outer shaft part being 100wt%, each outer shaft part contains 35-60wt% vanadium, 15-25wt% chromium, 10-25wt% carbon, and 10-25wt% iron. And 5-10wt% aluminum. The present invention discloses the specific composition after co-infiltration, and each chain piece is provided with a molybdenum disulfide layer, which improves the wear resistance and self-lubricity of the chain as a whole.

Description

Chain with toothed links

The present invention relates to a transmission element, in particular to a chain containing tooth-shaped chain pieces.

Patent case CN208397226 discloses a chain comprising a number chain plate, a number shaft sleeve, and a number chain pin assembled with each other. A graphite layer is formed on the outer surface of each shaft sleeve. Each graphite layer is provided with a molybdenum disulfide layer connected to the graphite layer through an adhesive layer.

Patent No. CN105369192 discloses a method for reducing the wear elongation of a toothed chain. The main method is to infiltrate chromium vanadium into the pin shaft to obtain better wear resistance than carbonitride infiltration or simple chromizing treatment.

Regarding the above two patents, the chain plate (chain piece) of the 226' patent is not provided with a molybdenum disulfide layer. Therefore, the chain plate of the 226' patent has poor wear resistance and self-lubricating properties, while the 192' patent does not provide a common It is difficult to realize the specific composition after infiltration, and both have defects.

The object of the present invention is to provide a chain including tooth-shaped links that can overcome at least one of the disadvantages of the prior art.

The chain including tooth-shaped chain pieces includes several chain pieces and several chain shafts. Each chain piece includes a chain piece body and a molybdenum disulfide layer formed outside the chain piece body and mainly composed of molybdenum disulfide. The chain shafts and the chain pieces are assembled together to form the chain in cooperation. Each chain shaft includes a shaft core portion and an outer shaft portion surrounding the shaft core portion. Among them, based on the total weight of each outer shaft part being 100wt%, each outer shaft part contains 35-60wt% vanadium, 15-25wt% chromium, 10-25wt% carbon, and 10-25wt% iron. And 5-10wt% aluminum.

The effect of the present invention is that the specific composition after co-infiltration is disclosed, and each chain piece is provided with a molybdenum disulfide layer, which improves the wear resistance and self-lubricity of the chain as a whole.

"Examples"

Referring to FIGS. 1 and 2, an embodiment of a chain including tooth-shaped links of the present invention is a chain 1. The chain 1 includes several tooth-shaped chain pieces 11, and several pieces of the chain pieces 11 are connected in series to cooperate with the chain pieces 11 to form the chain shaft 12 of the chain 1. In this embodiment, the links 11 refer to all the inner links and all the middle links, but do not include the outer links. In other embodiments of the present invention, the chain piece 11 can also be only all the inner chain pieces, only all the middle chain pieces, all the inner chain pieces and part of the middle chain pieces, and part of the inner chain pieces. Pieces and all the middle links, or part of the inner links and part of the middle links, but not including the outer links.

2 to 4, each link 11 includes a link body 111 and a molybdenum disulfide layer 112 formed outside the link body 111 and mainly composed of molybdenum disulfide.

Each link body 111 includes a body surface 113 connected to a respective molybdenum disulfide layer 112. Each body surface 113 includes two piece portions 113a arranged at intervals along the thickness direction of the chain piece body 111 and extending along the length and width directions of the chain piece body 111, and a hole portion 113c that defines two chain holes 113b, And a side surface portion 113d extending along the thickness direction of the chain piece body 111 and surrounding the hole portions 113c.

The average roughness (Ra, the same hereinafter) of the center line of the sheet surface portions 113a, the hole surface portions 113c, and the side surface portion 113d of each body surface 113 is 0.15 μm, and a plurality of pores 114 are formed. In other embodiments of the present invention, the average roughness of the center line of each body surface 113 can also be 0.1-0.2 μm.

Each molybdenum disulfide layer 112 is directly formed on the respective chain body 111 with molybdenum disulfide powder, and is completely wrapped and covered outside the respective chain body 111. Since each molybdenum disulfide layer 112 is formed by dissolving molybdenum disulfide powder in kerosene as described later, it may include a small amount of impurities that are difficult to remove.

Each molybdenum disulfide layer 112 includes a main layer portion 112a covering the link body 111, and a plurality of hole filling portions 112b extending from the main layer portion 112a to the link body 111 and filling the pores 114 .

The thickness T1 of each molybdenum disulfide layer is 1 to 2 µm. More specifically, the layer thickness T1 refers to the thickness of each main layer portion 112a. In other embodiments of the present invention, the layer thickness T1 of each molybdenum disulfide layer 112 can also be 1-3 μm.

Referring to FIGS. 1 and 5, each chain shaft 12 includes a shaft core portion 121 and an outer shaft portion 122 surrounding the side surface of the shaft core portion 121.

Each outer shaft portion 122 has a thickness T2 of 20 μm and includes a chain shaft surface 123 opposite to the respective shaft core portion 121. The average roughness of the center line of the surface 123 of each chain shaft is 0.05 µm.

Based on the total weight of each outer shaft portion 122 as 100% by weight, it includes 38.49% by weight of vanadium, 19.61% by weight of chromium, 14.86% by weight of carbon, 19.92% by weight of iron, and 7.12% by weight of aluminum.

In other embodiments of the present invention, the thickness T2 of each outer shaft portion 122 can also be 10-25 µm, and the average roughness of the center line of each chain shaft surface 123 can also be 0.05-0.08 µm. The total weight of the shaft 122 is 100% by weight, and each outer shaft 122 can also contain 35-60% by weight of vanadium, 15-25% by weight of chromium, 10-25% by weight of carbon, 10-25% by weight of iron, and 5 %～10% aluminum.

The characteristic of this embodiment is that each chain piece 11 is provided with a separate molybdenum disulfide layer 112, which improves the wear resistance and self-lubricity of the chain 1 as a whole, and provides a specific composition after co-permeation. According to the realization. In addition, since the centerline average roughness of the body surface 113 of each chain piece 11 is 0.15 µm between 0.1 and 0.2 µm, each molybdenum disulfide layer 112 in this case can be directly formed on a separate The link body 111 does not need to be combined through an adhesive layer as in the prior art.

Referring to Figures 3, 5, and 6, the processing method of the chain piece 11 and the chain shaft 12 in this embodiment is as follows:

〈Chain processing〉

Take several inner chain pieces and several middle chain pieces with the steel number of SAE 1552, and then coarsely grind them with ceramic powder particles with a particle size of 0.1-0.3mm. Next, take nano-grade molybdenum disulfide powder and add it to kerosene to prepare a soaking solution for later use, wherein the usage amount of kerosene and molybdenum disulfide powder is 2:1 by weight. Soak the spray-washed inner chain piece and the middle chain piece in the soaking solution for at least 5 minutes to make the inner chain piece and the middle chain piece adsorb molybdenum disulfide, and finally the soaked The inner chain piece and the middle chain piece are baked at a baking temperature of 120-150° C. for 15-30 minutes to obtain the chain piece 11. Wherein, the particle size of the molybdenum disulfide powder is 30-50nm.

〈Chain shaft processing〉

Take several female shafts with the steel number GCr15 for co-permeation processing with a co-permeable composition. Wherein, based on the total weight of the co-permeated composition being 100wt%, the co-permeated composition contains 38wt% of vanadium ferrite, 30wt% of chromium, 30wt% of alumina, 0.8wt% of ammonium chloride, 0.4wt% % Aluminum, and 0.8wt% potassium fluoroborate. The co-infiltration processing conditions are heating to 950-1050°C, maintaining such a temperature for 6-8 hours, and then cooling to below 300°C for discharging.

After the said mother shaft is co-permeated, it is then polished and processed with a support 21, a grinding wheel 22 and a guide wheel 23 as shown in FIG. 6 to obtain the average roughness of the center line of the surface 123 of the chain shaft The chain shaft 12 is 5-8μm. Wherein, the grinding wheel 22 is a boron nitride grinding wheel, and the guide wheel 23 is a ceramic guide wheel. The support of the ceramic guide wheel is small and it is not easy to deform. Boron nitride has a strong cutting force, and compared with diamond grinding wheels, the loss during the grinding process is smaller, and the surface roughness of the chain shaft 12 can be more accurately controlled.

In other embodiments of the present invention, based on the total weight of the co-infiltrated composition being 100% by weight, the co-infiltrated composition can also contain 35-40% by weight of vanadium ferrite, 28-32% by weight of chromium, and 28-32% by weight. 32wt% alumina, 0.5-0.8wt% ammonium chloride, 0.25-0.5wt% aluminum, and 0.25-0.8wt% (for example 0.5wt%) potassium fluoroborate.

"Comparative Examples 1 to 3"

Comparative Examples 1 to 3 are chains with the same appearance as this embodiment. The difference is that: the chain shaft of Comparative Example 1 has been processed by carbonitriding, and the inner chain and the middle chain are not coated with molybdenum disulfide. Layer, the chain shaft of Comparative Example 2 was processed by carbonitriding, and the chain shaft of Comparative Example 3 was processed by chromium-vanadium co-permeation, and no molybdenum disulfide coating was formed on the inner chain and the middle chain. The examples and comparative examples 1 to 3 are concisely summarized in Table 1 below: Example Comparative example 1 Comparative example 2 Comparative example 3 Chain shaft penetration Chrome vanadium Carbon and nitrogen Carbon and nitrogen Chrome vanadium MoS ₂ coating have none have none

〈Engine Test〉

The Examples and Comparative Examples 1 to 3 were subjected to engine tests as described below. An engine is provided, which includes a 17-tooth small gear and a 34-tooth large gear. The rotation speed of the pinion is 8000 rpm for testing. The Examples and Comparative Examples 1 to 3 are installed on the pinion and the large gear of the engine, and run continuously for 400 hours, and the relationship between different operating time and elongation is recorded in Table 2, and a line chart is drawn as shown in the figure 7. Elongation(%) Running time (hr) 50 100 150 200 250 300 350 400 Example 0.0085 0.0127 0.0213 0.0298 0.0425 0.530 0.0723 0.0893 Comparative example 1 0.0340 0.0893 0.1403 0.2042 0.2680 0.3318 0.3913 0.4424 Comparative example 2 0.0213 0.0425 0.0595 0.0851 0.1021 0.1234 0.1446 0.1616 Comparative example 3 0.0127 0.0213 0.0383 0.0595 0.0766 0.1021 0.1233 0.1489

Judging from the foregoing test results, the examples are compared to comparative examples 1, 3 in which only the chain shaft carbonitriding or chromium-vanadium co-infiltration and the inner chain and the middle chain do not have a molybdenum disulfide layer, or only the inner chain Compared with Comparative Example 2, which has a molybdenum disulfide layer in the middle chain but no chromium-vanadium co-permeation on the chain shaft, after 400 hours of running test, it can have a smaller elongation, which shows that the present invention is compared with Comparative Examples 1 to 3 In other words, it does have better abrasion resistance.

In summary, the effect of the chain of the present invention including tooth-shaped links is that each link 11 is provided with the corresponding molybdenum disulfide layer 112, which improves the wear resistance and self-lubricity of the chain 1 as a whole, and The specific composition after co-infiltration is provided, which can be realized accordingly.

The above are only examples of the present invention, and cannot be used to limit the scope of patent application of the present invention, and simple equivalent changes and modifications based on the scope of patent application and patent specification of the present invention shall also be the present invention. Covered by the scope of the patent application.

1: chain 11: chain piece 111: chain body 112: Molybdenum disulfide layer 112a: Main floor 112b: Filling part 113: body surface 113a: slice of face 113b: chain hole 113c: hole face 113d: side 114: Pores 12: chain shaft 121: Shaft core 122: Outer shaft 123: chain shaft surface 21: Support 22: Grinding wheel 23: guide wheel T1: layer thickness T2: thickness

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is an exploded view from a top perspective, illustrating an embodiment of the chain of the present invention including tooth-shaped links; Figure 2 is a side view illustrating a link body of one of the several links of the embodiment; Figure 3 is a cross-sectional view illustrating the relationship between the chain body of one of the chain pieces and a molybdenum disulfide layer correspondingly formed outside the chain piece body; Figure 4 is an incomplete cross-sectional view illustrating the relationship between the chain piece body of one of the chain pieces and the molybdenum disulfide layer correspondingly formed outside the chain piece body; Figure 5 is a cross-sectional view illustrating one of the chain shafts of the embodiment; and Figure 6 is a side view illustrating the grinding method of each chain shaft; Fig. 7 is a broken line diagram illustrating the engine test results of this embodiment and Comparative Examples 1 to 3.

1: chain

11: chain piece

12: chain shaft

Claims (10)

A chain comprising: several chain pieces, each of the aforementioned chain pieces comprises a chain piece body, and a molybdenum disulfide layer formed outside the chain piece body and mainly composed of molybdenum disulfide; and several chain shafts, and The chain pieces are assembled together to cooperate to form the chain. Each of the aforementioned chain shafts includes a shaft core portion and an outer shaft portion surrounding the shaft core portion, wherein the total weight of each of the aforementioned outer shaft portions is 100wt. In %, each of the aforementioned outer shaft portions contains 35-60wt% vanadium, 15-25wt% chromium, 10-25wt% carbon, 10-25wt% iron, and 5-10wt% aluminum. The chain according to claim 1, wherein each of the aforementioned chain body includes a body surface connected to a respective molybdenum disulfide layer, and the centerline average roughness of each of the aforementioned body surfaces is 0.1 to 0.2 μm, and each of the aforementioned A molybdenum disulfide layer is directly adsorbed and formed on the surface of each body. The chain according to claim 2, wherein each of the body surface includes a plurality of hole portions, each of the hole portions defines a chain hole, and each of the molybdenum disulfide layers further extends into the chain holes and directly The adsorption is formed on the corresponding hole faces. The chain according to claim 1, wherein each of the aforementioned molybdenum disulfide layers is formed of molybdenum disulfide powder with a particle size of 30-50 nm. The chain according to claim 1, wherein the thickness of each molybdenum disulfide layer is 1 to 3 μm. The chain according to claim 1, wherein the thickness of each of the aforementioned outer shaft portions It is 10~25μm. The chain according to claim 1, wherein each of the aforementioned outer shaft portions includes a chain shaft surface that is opposite to the respective shaft core portion and has an average centerline roughness of 0.05 to 0.08 μm. The chain according to claim 1, wherein each of the aforementioned outer shaft portions is processed by a co-permeable composition, and the co-permeated composition includes 35-40wt% of vanadium ferrite, 28-32wt% of chromium, 28 ~32wt% alumina, 0.5~0.8wt% ammonium chloride, 0.25~0.5wt% aluminum, and 0.25~0.8wt% potassium fluoroborate. The chain according to claim 1, wherein each of the aforementioned links has a tooth shape and is selected from at least one of the group consisting of inner links and intermediate links. The chain according to claim 1, wherein each of the aforementioned chain shafts is processed by a grinding wheel made of boron nitride material and a guide wheel made of ceramic material.

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