JP2003011280A - Connecting member having fitting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting member having a fitting part provided with a resin coating which can be formed at a low manufacturing cost. SOLUTION: In the connecting member having the fitting part, a first resin layer 6 is constituted of a polyphenylene sulfide resin. Therefore the layer 6 can be joined directly to the surface 1A of the fitting part 4 constituted of a ferrous metal, for instance. Besides, the layer 6 constituted of the polyphenylene sulfide resin can be applied as a coat on the surface 1A of the fitting part 4 by electrostatic coating. Therefore the coat can be manufactured in a dry environment. Thus a drying process is dispensed with and the layer can be formed at a low manufacturing cost. A second resin layer 7 covering the first resin layer 6 is constituted of a resin of a nylon, an olefin, an ester or Teflon (R). Therefore it is excellent in slidability and thus reduction of a sliding resistance and sound insulation can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling member such as a spline whose fitting portion is coated with resin.

[0002]

2. Description of the Related Art Conventionally, in connection members such as power transmission parts,
For the purpose of reducing sliding resistance and soundproofing, there is a product in which a fitting part (sliding part) is coated with nylon resin. But,
Since this nylon resin does not have good adhesion to the fitting part made of iron or non-ferrous metal, an undercoat made of an organic or inorganic adhesive is previously fitted to improve the adhesion. It was formed on the surface of the part.

[0003]

However, this undercoat consisting of an organic or inorganic adhesive requires a step of dissolving it in a solvent, and thus requires a drying step,
The manufacturing cost was high.

Therefore, an object of the present invention is to provide a connecting member having a fitting portion provided with a resin coating which can be formed at a low manufacturing cost.

[0005]

In order to achieve the above object, a connecting member having a fitting portion according to the invention of claim 1 is made of polyphenylene sulfide resin, and a first resin layer covering the surface of the fitting portion. And a second resin layer made of a nylon-based, olefin-based, ester-based, or Teflon-based resin and covering the first resin layer.

According to the connecting member of the invention of claim 1,
Since the resin layer of No. 1 is made of polyphenylene sulfide resin, this first resin layer can be directly joined to the fitting portion made of, for example, iron metal. Further, the first resin layer made of this polyphenylene sulfide-based resin can cover the fitting portion by electrostatic coating, so that it can be manufactured in a dry environment, a drying step is not required, and the manufacturing cost is low. Can be formed.

Since the second resin layer covering the first resin layer is made of a nylon type, olefin type, ester type or Teflon type resin, it has good slidability,
It is possible to reduce sliding resistance and achieve sound insulation.

Further, the connecting member having the fitting portion of the invention of claim 2 is a resin made of a mixed resin in which a polyphenylene sulfide resin and a nylon resin, an olefin resin, an ester resin or a Teflon resin are mixed. It is characterized in that the layer covers the fitting portion.

In the connecting member according to the second aspect of the present invention, since the mixed resin contains the polyphenylene sulfide resin, the resin layer made of the mixed resin is directly joined to the fitting portion made of, for example, iron metal. it can. Further, a mixed resin in which the polyphenylene sulfide-based resin is mixed with any of the nylon-based, olefin-based, ester-based, and Teflon-based resins can cover the fitting portion by electrostatic coating. Can be manufactured in a dry environment,
A drying process is not required, and it can be formed at a low manufacturing cost.

Further, any of the nylon-based, olefin-based, ester-based, and Teflon-based resins contained in the above mixed resin has a good slidability. Reduction and soundproofing can be achieved.

Further, in this coupling member, since the resin layer covering the fitting portion is made of the mixed resin, the number of processing steps can be reduced as compared with the case of forming a plurality of layers, and further cost reduction can be achieved. it can.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings.

(First Embodiment) FIG. 1A shows an end surface of a spline shaft 1 as an embodiment of a connecting member having a fitting portion according to the present invention. This spline shaft 1
Is made of an iron-based metal, and crests 2 and troughs 3 serving as spline teeth are alternately formed in the circumferential direction. The crests 2 and troughs 3 are formed.
Extends in the axial direction. The peak portion 2 and the valley portion 3 form a fitting portion 4.

As shown in FIG. 1B, the spline shaft 1 has a resin coating 5 for covering the surface 1A of the fitting portion 4.
have. The resin coating 5 is composed of a first resin layer 6 made of polyphenylene sulfide (PPS) resin and a second resin layer 7 covering the first resin layer 6. The second resin layer 7 is made of PPA (polyphthalamide) which is a nylon resin.

According to the spline shaft 1 of this embodiment, since the first resin layer 6 is made of polyphenylene sulfide resin, the first resin layer 6 is directly attached to the fitting portion 4 made of iron metal. Can be joined to. Further, the first resin layer 6 made of this polyphenylene sulfide (PPS) -based resin can cover the fitting portion 4 by electrostatic coating, so that it can be manufactured in a dry environment and a drying step is unnecessary. Can be formed at low manufacturing cost.

Further, the second resin layer 7 covering the first resin layer 6 is made of PPA (polyphthalamide) which is a nylon resin, so that it has a good slidability, a reduced sliding resistance and a soundproofing. Can be achieved.

Next, with reference to FIGS. 2A and 2B, a method of manufacturing the resin coating 5 in the above embodiment will be described. First, as shown in FIG. 2 (A), on the surface 1A of the fitting portion 4, P
A resin powder 21 made of PS resin is applied by electrostatic coating. Then, the resin powder 23 made of PPA (polyphthalamide) is powder coated again on the undercoat resin layer 22 made of the resin powder 21 to form the upper coat resin layer 2
5 is formed.

Next, the upper coating resin layer 25 and the lower coating resin layer 22 are heated for about 10 minutes at a temperature above the melting temperature of the lower coating resin layer 22 and above 350 ° C., which is a temperature at which the upper coating resin layer 25 also melts. . As a heating method, an oven may be used for heating from the outside, or induction heating or the like may be used for heating from the inside.

As a result, as shown in FIG. 2B, the undercoat resin layer 22 is melted to form the first resin layer 6, and the topcoat resin layer 25 is melted to form the second resin layer 7, which are fitted together. The portion 4 is coated with a resin coating 5 having a two-layer structure including a first resin layer 6 and a second resin layer 7. Here, the layer thickness of the first resin layer 6 is 100 μm, and the layer thickness of the second resin layer 7 is 100 μm.

Although the second resin layer 7 is made of PPA (polyphthalamide) in the first embodiment, other nylon resins (PA6, PA66, PA46, PA11, PA) are used.
12, MXD (aromatic polyamide)). In addition to nylon resin, PP (polypropylene), P
E (Polyethylene) (UHDPE (Ultra High Density Polyethylene)
Olefin resin, ester resin such as PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), PTFE (polytetrafluoro) A Teflon resin such as ethylene) may be used.

(Second Embodiment) Next, a second embodiment of the coupling member having the fitting portion of the present invention will be described. The second embodiment is different from the above-described first embodiment in that the resin coating 5 having the two-layer structure is replaced with a resin coating 31 made of a mixed resin as shown in FIG. 3B. Different from the first embodiment.

First, the manufacturing process of the resin coating film 31 will be described. First, as shown in FIG. 3 (A), resin powder 32 made of PPS resin and PTFE, which is Teflon resin, are used.
Electrostatic powder coating is performed on the surface 1A of the fitting portion 4 with the mixed powder mixed with the resin powder 33 made of (polytetrafluoroethylene). Thus, the resin powder layer 36 including the PPS resin powder 32 and the PTFE resin powder 33 is formed. Here, in the resin powder layer 36, PP
The mixing ratio of the S-based resin powder 32 and the PTFE-based resin powder 33 was approximately 5: 5 in weight%, but it was 2: 8.
It can be set within the range of up to 9.9 to 0.1.

Next, at 350 ° C. or higher, the resin powder layer 3 is formed.
As shown in FIG. 3 (B), 6 is heated to form a mixed resin layer 31 made of a mixed resin obtained by melting PPS-based resin powder 32 and PTFE-based resin powder 33 in a mixed state. The mixed resin layer 31 includes a molten resin portion 35 in which the resin powder 32 is melted and a molten resin portion 34 in which the resin powder 33 is melted.
Consists of. The heating temperature is equal to or higher than the melting temperature of the PPS-based resin powder 32, and the PTFE-based resin powder 3 is used.
The melting point of 3 may be used. In this case, when heating, the PPS resin powder 32 becomes the PTFE resin powder 33.
It melts earlier than before and collects at the interface with surface 1A,
It becomes the molten resin portion 35 shown in (B), and thereafter, the PTFE-based resin powder 33 having slidability is melted and gathers on the surface layer to become the molten resin portion 34 shown in FIG. 3 (B). Therefore, the sliding performance can be improved. In addition, in this embodiment, the layer thickness of the resin layer 31 is 200 μm.

In the joining member of this embodiment, the mixed resin layer 31 made of the mixed resin can be directly bonded to the fitting portion 4 made of the iron-based metal by the polyphenylene sulfide resin contained in the mixed resin. In addition, the above polyphenylene sulfide resin and Teflon-based PT
The mixed resin mixed with the resin made of FE (polytetrafluoroethylene) can be manufactured in a dry environment because the fitting part 4 can be coated by electrostatic coating, and a drying process is not necessary. Can be formed at low manufacturing cost.

Further, since the Teflon-based resin contained in the above mixed resin has good slidability, the mixed resin layer 31 made of this mixed resin can achieve reduction in sliding resistance and soundproofing.

Further, in the coupling member of this embodiment, since the resin layer 31 covering the fitting portion 4 is made of the above mixed resin, the number of processing steps can be reduced as compared with the case of forming a plurality of layers, Further cost reduction can be achieved.

In the second embodiment, the PPS resin powder 32 and the PTFE resin powder 33 are mixed.
You may mix the powder which consists of other TFA such as PFA. In addition to Teflon resin, PP, PE (UH
Olefin resin such as DPE) can be adopted, and nylon resin (PA6, PA66, PA46, PA1)
1, PA12, MXD) to form the resin powder 33. Alternatively, the resin powder 33 may be made of an ester resin such as PET or PBT. Further, a powder of a mixed system obtained by pulverizing a material obtained by kneading a PTFE-based, olefin-based, nylon-based, or ester-based resin material with a PPS-based resin material is used.
This may be melted to form a resin layer made of a mixed resin.
In this case, the resin layer becomes more uniform.

Further, in the first and second embodiments, as the coupling member having the fitting portion, as shown in FIG. 1 (A),
Although the spline shaft 1 having the spline teeth 2 formed on the outer peripheral surface has been described as an example, as shown in FIG.
The fitting portion 82 of the cylindrical spline shaft 82 having a fitting portion 82A having spline teeth 81 formed on the inner peripheral surface thereof.
A resin coating film as in the first and second embodiments may be formed on A. Further, the present invention can be applied to a connecting member having a fitting portion for serration fitting or key fitting other than the spline. Further, in the first and second embodiments, the spline shaft is made of ferrous metal, but it may be made of non-ferrous metal.

As shown in FIG. 4, the reaction layer 71 may be formed on the surface of the fitting portion 70 made of metal of the coupling member, and then the resin coating 75 may be formed. This resin coating 75
To form the, first, on the metal surface forming the fitting portion 70,
An aminoalkylsilane-based silane coupling agent is coated at an appropriate concentration and heat-treated at about 120 ° C., and the silane coupling agent is reacted with the metal surface to form a reaction layer 71. Next, an undercoat layer 72 made of, for example, an epoxyphenol resin is applied onto the reaction layer 71 formed by this coupling treatment and dried. Next, after electrostatically coating a resin powder made of PA66, PA46, PPA or the like on the undercoat layer 72, the resin powder is melted at a temperature higher by 20 ° C. or more than the resin melting temperature, A resin film 73 is formed. As described above, by forming the reaction layer 71 on the metal surface of the fitting portion 70 by using the silane coupling agent on the surface of the fitting portion 70 made of the base metal, the adhesion to the resin is improved and the heat resistance is improved. It becomes possible to coat resin with a certain amount. Further, according to the reaction layer 71, the cost can be reduced as compared with an expensive undercoating agent that can handle high temperature processing. As the silane coupling agent, γ-
(2-aminoethyl) aminopropyltrimethoxysilane,
γ-glycidoxypropyltrimethoxysilane and the like.

[0030]

As is apparent from the above, in the joining member having the fitting portion according to the first aspect of the present invention, the first resin layer is made of polyphenylene sulfide-based resin.
The resin layer can be directly bonded to, for example, a fitting portion made of an iron-based metal. The first resin layer made of this polyphenylene sulfide resin is electrostatically coated,
Since the fitting portion can be covered, it can be manufactured in a dry environment, a drying process is unnecessary, and it can be formed at a low manufacturing cost.

Since the second resin layer covering the first resin layer is made of a nylon-based resin, an olefin-based resin, an ester-based resin, or a Teflon-based resin, it has good slidability,
Reduction of sliding resistance and soundproofing can be achieved.

In the joining member having the fitting portion according to the second aspect of the present invention, the polyphenylene sulfide-based resin contained in the mixed resin is used to form a resin layer made of the mixed resin into a fitting made of, for example, an iron-based metal. Can be directly joined to the part. Further, the mixed resin in which the polyphenylene sulfide-based resin and the nylon-based or olefin-based or ester-based or Teflon-based resin are mixed by electrostatic coating, it is possible to cover the fitting portion,
It can be manufactured in a dry environment, does not require a drying process, and can be formed at low manufacturing cost.

The nylon-based, olefin-based, ester-based, or Teflon-based resin contained in the mixed resin has good slidability. Therefore, the resin layer made of this mixed resin reduces sliding resistance and reduces noise. Can be achieved.

Further, in this coupling member, since the resin layer covering the fitting portion is made of the above-mentioned mixed resin, the number of processing steps can be reduced and further cost reduction can be achieved as compared with the case of forming a plurality of layers. it can.

[Brief description of drawings]

FIG. 1 (A) is an end view of a first embodiment of a coupling member having a fitting portion of the present invention, and FIG. 1 (B) is a cross-sectional view of the essential parts of this embodiment, FIG. 1C is an end view of the modified example.

2 (A) and 2 (B) are cross-sectional views of relevant parts for sequentially explaining the manufacturing method of the first embodiment.

FIGS. 3A and 3B are cross-sectional views of a main part for sequentially explaining the manufacturing method of the second embodiment.

FIG. 4 is a cross-sectional view showing a state in which a resin coating is formed on a reaction layer formed on a metal surface with a coupling agent.

[Explanation of symbols]

1 ... Spline shaft, 1A ... Surface, 2 ... Mountain part, 3 ...
Valley part, 4 ... fitting part, 5 ... resin coating, 6 ... first resin layer,
7 ... 2nd resin layer, 21 ... Resin powder, 22 ... Undercoat resin layer, 25 ... Overcoat resin layer, 31 ... Resin coating, 32, 33
... Resin powder, 36 ... Resin powder layer, 70 ... Fitting portion, 72 ...
Undercoat layer, 75 ... Resin coating, 81 ... Spline teeth, 82 ... Spline shaft, 82A ... Fitting portion.

Claims (2)

[Claims] 1. A first resin layer made of polyphenylene sulfide resin, which covers the surface of a fitting portion, and a nylon, olefin, ester or Teflon resin, which covers the first resin layer. A coupling member having a fitting portion, comprising a second resin layer. 2. A polyphenylene sulfide-based resin,
A coupling member having a fitting portion, wherein a resin layer made of a mixed resin mixed with a nylon-based, olefin-based, ester-based, or Teflon-based resin covers the fitting portion.