CN106554597A

CN106554597A - The manufacture method of resin gears, resin gears polyacetal resin composite, its manufacture method and resin gears

Info

Publication number: CN106554597A
Application number: CN201610344667.2A
Authority: CN
Inventors: 清水友宏; 高桥洋介; 河野良二
Original assignee: Asahi Kasei Kogyo KK
Current assignee: Asahi Kasei Corp
Priority date: 2015-09-25
Filing date: 2016-05-23
Publication date: 2017-04-05
Also published as: DE102016110098A1; JP6353422B2; JP2017062017A

Abstract

The present invention relates to the manufacture method of resin gears, resin gears polyacetal resin composite, its manufacture method and resin gears.The invention solves the problems that problem be to obtain a kind of gear with high-durability and quietness.A kind of resin gears, its be with gear ring portion (2), and be arranged at the gear ring portion (2) peripheral part teeth portion (1) resin gears, wherein, the difference (d-c of dependent variable c (%) and dependent variable d (%)：Overstrain) for less than 0.9 percentage point, above-mentioned dependent variable c (%) be for above-mentioned gear ring portion (2), or gear after the load of 1 75MPa and the unloading from 75MPa to 15MPa are carried out for above-mentioned gear ring portion (2) and above-mentioned teeth portion (1) dependent variable, above-mentioned dependent variable d (%) is the dependent variable of the gear after the load of 50 75MPa and the unloading from 75MPa to 15MPa is repeated.

Description

Resin gears, resin gears polyacetal resin composite, its manufacture method, With the manufacture method of resin gears

Technical field

The present invention relates to resin gears, resin gears polyacetal resin composite, its manufacture method and resin-made The manufacture method of gear.

Background technology

Resin gears as power transmitting mechanism, drive connecting gear be used for the OA equipment such as duplicator, printer, In the extensive purposes such as glass for vehicle window, seat and skylight in the digital household appliances such as VTR, DVD, blue light, automobile.Particularly, resin Gear processed is due to light weight just in alternative metals metal gear.

In addition, polyacetal resin have the mechanical strengths such as the modulus of elasticity in static bending and tensile break stress, chemical proofing, The characteristics of balancing good and handling ease of sliding and abrasion performance.Therefore, polyacetal resin is used as representational engineering Plastics are often used as the material of the gear of the various industrial parts such as the structure member and automotive part of electrical equipment.

Particularly, used in the automotive part for requiring high-durability by inorganic filler strengthened it is poly- Acetal resin composition.

It should be noted that " durability " for example refers to that the rupture life under certain stress is long herein.

In the polyacetal resin composite strengthened above by inorganic filler, in order to further improve durable Property, generally carry out the control of the end group of the molecular weight or polyacetal resin of polyacetal resin.

A kind of polyacetal resin composite is Patent Document 1 discloses, which includes polyacetals to improve durability Resin and fibrous inorganic filling material.In addition, the molecular weight that Patent Document 1 discloses polyacetal resin is more big then durable The higher content of property.

Patent Document 2 discloses a kind of polyacetal resin comprising glass system inorganic filling material and polyacetal resin Composition, and disclose following methods, the method is in order to improve the interface of glass system inorganic filling material and polyacetal resin Adaptation, shared the different various polyacetal resins of the content of terminal hydroxyl.

Patent Document 3 discloses the description below：By using the ABA block polymer comprising polyacetals skeleton, So as to improve the adaptation with glass fibre etc..

It is in addition, the expansion in the utilization field with polyacetal resin, it is desirable to improve abrasion performance, from this side considerations, right Abrasion performance is improved by adding ultra-high molecular weight polyethylene in resin combination to be studied.

Patent Document 4 discloses the description below：In order to improve the polyacetal resin composite comprising glass fibre Abrasion performance, mixture lubricant.In addition, Patent Document 4 discloses preferred ultra-high molecular weight polyethylene as lubricant.

Patent Document 5 discloses the description below：In order to improve mechanical strength, abrasion performance and sliding, including Mixture lubricity modifying agent in the polyacetal resin composite of glass fibre.Particularly, disclose lubricity modifying agent preferably to put down Average molecular weight is more than 1.0 × 10⁶G/ mole of ultra-high molecular weight polyethylene.

Prior art literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 11-181231 publication

Patent document 2：Japanese Unexamined Patent Publication 2004-359791 publications

Patent document 3：International Publication No. 2001/009213

Patent document 4：Japanese Unexamined Patent Publication 9-272802 publication

Patent document 5：Japanese Unexamined Patent Application Publication 2014-534301 publication

The content of the invention

Invention problem to be solved

But, in recent years, improve mechanical strength, durability, abrasion performance and quietness etc. are required in resin gears Further high performance.Particularly, in order to long lasting for transmission high pulling torque, require high-durability in many cases.And, Recently for the requirement of quietness is improved simultaneously.

On the other hand, if resin molecular weight is made to improve durability, mobility is reduced, and shaping becomes tired Difficulty, therefore with the problem for causing the gear such as bad order quality to reduce.

In addition, in the case where with the addition of ultra-high molecular weight polyethylene to improve abrasion performance, due to supra polymer Weight northylen comes off, when resin particle is manufactured with the problem for easily producing chip.Further, since the increase of chip, Be susceptible to forming machine feed when charging it is bad, molding cycle is elongated, thus can cause the reduction of Gear Production rate, and then Also there is the problem that may cause that quietness is reduced caused by bad order.

In prior art disclosed in above-mentioned patent document 1～5, exist and cannot obtain with high mechanical strength, resistance to Abrasivity and the also excellent resin gears of excellent in te pins of durability, quietness.

Therefore, in the present invention, problem is to provide a kind of resin gears especially with high durability and quietness.

For solving the scheme of problem

The artificial above-mentioned problem of solution Decision of the present invention has made intensive studies, and as a result finds, for gear ring portion and setting After the gear ring portion of the resin gears of the teeth portion of the peripheral part in the gear ring portion and teeth portion carry out the load of particular value and unloading Dependent variable (%) can solve the problem that above-mentioned problem for the gear of particular value, this completes the present invention.

That is, the present invention is as described below.

[1]

A kind of resin gears, which is the resin-made of the teeth portion with gear ring portion and the peripheral part for being arranged at the gear ring portion Gear,

Wherein, the difference (d-c of dependent variable c (%) and dependent variable d (%)：Overstrain) for less than 0.9 percentage point,

Above-mentioned dependent variable c (%) is for above-mentioned gear ring portion or for above-mentioned gear ring portion and above-mentioned teeth portion carry out 1 time The dependent variable of the gear after the load of 75MPa and the unloading from 75MPa to 15MPa,

Above-mentioned dependent variable d (%) is the tooth after the load of 50 75MPa and the unloading from 75MPa to 15MPa is repeated The dependent variable of wheel.

[2]

Wherein, the difference (b-c of dependent variable b (%) and dependent variable c (%)：Elastic strain) for less than 2.5 percentage points,

Above-mentioned dependent variable b (%) is for above-mentioned gear ring portion or for above-mentioned gear ring portion and above-mentioned teeth portion have carried out 1 time The dependent variable during load of 75MPa,

Above-mentioned dependent variable c (%) carries out the dependent variable after 1 unloading from 75MPa to 15MPa for it afterwards.

[3]

Wherein, the value ((d- obtained by the difference (d-a) by overstrain d-c divided by dependent variable d (%) with dependent variable a (%) c)/(d-a))：Computer simulation) for less than 0.50,

Above-mentioned overstrain d-c is the difference of dependent variable c (%) and dependent variable d (%), and above-mentioned dependent variable c (%) is for upper After stating gear ring portion or the load of 1 75MPa and the unloading from 75MPa to 15MPa being carried out for above-mentioned gear ring portion and above-mentioned teeth portion Gear dependent variable, above-mentioned dependent variable d (%) is that the load of 50 75MPa and the unloading from 75MPa to 15MPa is repeated The dependent variable of gear afterwards,

In the difference (d-a) of above-mentioned dependent variable d (%) and dependent variable a (%), above-mentioned dependent variable d (%) is to be repeated 50 times Dependent variable after the load of 75MPa and the unloading from 75MPa to 15MPa, above-mentioned dependent variable a (%) for carried out 1 time until The dependent variable during load of 15MPa during load arrival 15MPa.

[4]

Resin gears any one of [1]～[3] as described above, which includes polyacetal resin.

[5]

Resin gears described in [4] as described above, wherein, relative to 100 mass parts of above-mentioned polyacetal resin, comprising glass It is below 100 mass parts of more than 10 mass parts of packing material.

[6]

Resin gears described in [5] as described above, wherein, in the case where above-mentioned resin gears are broken, from fracture It is less than more than 0.2 μm 3.0 μm comprising polyacetals tree that the surface of the above-mentioned glass system packing material that face projects is averaged thickness The composition of fat is covered.

[7]

Resin gears described in [5] or [6] as described above, wherein, as with the table to above-mentioned glass system packing material The material of the function that face is modified is sour comprising at least a kind.

[8]

Resin gears described in [7] as described above, wherein, above-mentioned acid is carboxylic acid.

[9]

Resin gears any one of [4]～[8] as described above, wherein, above-mentioned polyacetal resin comprising block into Point.

[10]

Resin gears described in [9] as described above, wherein, above-mentioned block component is that the hydrogenation of two end Jing hydroxyalkylations gathers Butadiene component.

[11]

Resin gears any one of [4]～[10] as described above, wherein, the end OH in above-mentioned polyacetal resin The content of base is more than 0.006mol% relative to the oxidation MU 1mol of main chain.

[12]

Resin gears any one of [4]～[11] as described above, wherein, relative to above-mentioned polyacetal resin 100 Mass parts, further comprising more than 0.5 mass parts of polyvinyl resin that weight average molecular weight is less than 500,000 8 mass parts below.

[13]

Resin gears described in [12] as described above, wherein, the fusing point of above-mentioned polyvinyl resin is less than 115 DEG C.

[14]

Resin gears described in [12] or [13] as described above, wherein, 1,000 μm is played with the top layer away from resin gears Place carries out the amount of the polyvinyl resin within the top layer 10nm in face that deep layer cutting is obtained and compares, above-mentioned resin gears The amount of the polyvinyl resin within the 10nm of top layer is more.

[15]

A kind of resin gears polyacetal resin composite, which is in the resin any one of above-mentioned [1]～[3] Polyacetal resin composite used in gear processed,

Which includes below 100 mass parts of more than 10 mass parts of 100 mass parts of polyacetal resin and glass system packing material.

[16]

Resin gears polyacetal resin composite described in [15] as described above, wherein, relative to above-mentioned polyacetals tree 100 mass parts of fat, further comprising more than 0.5 mass parts of polyvinyl resin that weight average molecular weight is less than 500,000 8 mass parts with Under.

[17]

Resin gears polyacetal resin composite described in [16] as described above, wherein, above-mentioned polyvinyl resin it is molten Point is less than 115 DEG C.

[18]

Resin gears polyacetal resin composite any one of [15]～[17] as described above, wherein, as The material of the function with the modifying surface to above-mentioned glass system packing material is sour comprising at least a kind.

[19]

Resin gears polyacetal resin composite described in [18] as described above, wherein, above-mentioned acid is carboxylic acid.

[20]

Resin gears polyacetal resin composite any one of [15]～[19] as described above, wherein, it is above-mentioned Polyacetal resin includes block component.

[21]

Resin gears polyacetal resin composite described in [20] as described above, wherein, above-mentioned block component is two last The hydrogenated butadiene polymer composition of end Jing hydroxyalkylations.

[22]

Resin gears polyacetal resin composite any one of [15]～[21] as described above, wherein, it is above-mentioned The content of the end OH bases in polyacetal resin is more than 0.006mol% relative to the oxidation MU 1mol of main chain.

[23]

A kind of manufacture method of resin gears polyacetal resin composite, which is any one of above-mentioned [15]～[22] The manufacture method of described resin gears polyacetal resin composite, the manufacture method include following operations：

It is using the material comprising at least a kind acid the function with the modifying surface to glass system packing material, right The operation of the modifying surface of glass system packing material；With

The operation mixed by Jing above-mentioned modified glass system packing material and polyacetal resin.

[24]

A kind of manufacture method of resin gears, which is included to the resin-made tooth any one of above-mentioned [15]～[22] The operation is molded with polyacetal resin composite by wheel.

The effect of invention

According to the present invention, the gear with high durability and quietness can be obtained.

Description of the drawings

Fig. 1 is the schematic plan of of the resin gears with gear ring portion and teeth portion.

Fig. 2 is the schematic sectional view of the resin gears of Fig. 1.

Fig. 3 is for illustrating the resin gears of the one of compression test and the schematic sectional view of pressure head.

Fig. 4 is the contact portion for illustrating pressure head of the resin gears of Fig. 1 in compression test and resin gears The schematic plan of the resin gears of (oblique line portion).

Fig. 5 is one with gear ring portion and the teeth portion and gear ring portion resin gears different from the thickness of teeth portion and shows Meaning property top view.

Fig. 6 is the schematic sectional view of the resin gears of Fig. 5.

Fig. 7 is contact portion (the oblique line portion for illustrating pressure head of the resin gears of Fig. 5 in compression test and gear Point) resin gears schematic plan.

Fig. 8 is the schematic plan of of the resin gears as the gear ring portion spur gear integrated with teeth portion.

Fig. 9 is contact portion (the oblique line portion for illustrating pressure head of the resin gears of Fig. 8 in compression test and gear Point) resin gears schematic plan.

Figure 10 is the load-unloading curve obtained by the compression test in embodiment 1.

Figure 11 is the load-unloading curve obtained by the compression test in comparative example 5.

Symbol description

1 teeth portion

2 gear ring portions

3 facewidth

4 pressure heads

The contact portion of 5 gears and pressure head

10 inner peripheral portion

Specific embodiment

Below, embodiments of the present invention (hereinafter referred to " present embodiment ") are described in detail, but the present invention Following records are not limited to, various modifications can be carried out to implement in the range of its main points.

[resin gears]

(resin gears of the 1st embodiment)

Resin gears in 1st embodiment have gear ring portion and are arranged at the teeth portion of the peripheral part in the gear ring portion,

(resin gears of the 2nd embodiment)

Resin gears in 2nd embodiment have gear ring portion and are arranged at the teeth portion of the peripheral part in the gear ring portion,

(resin gears of the 3rd embodiment)

Resin gears in 3rd embodiment are the teeth portion with gear ring portion and the peripheral part for being arranged at the gear ring portion Resin gears,

Wherein, overstrain d-c relative to dependent variable d (%) and the difference (d-a) of dependent variable a (%) ratio ((d-c)/ (d-a))：Computer simulation) for less than 0.50,

(polyacetal resin composite)

The resin gears of present embodiment preferably comprise polyacetal resin.Can be by including the polyacetal resin Polyacetal resin composite is molded and is obtained.

Polyacetal resin composite used in the resin gears of present embodiment contains polyacetal resin.

As polyacetal resin, polyacetal homopolymer, Copolyacetal, the polyacetals with cross-linked structure can be enumerated The block of copolymer, the block copolymer on the basis of the homopolymers with block component and the basis of the copolymer with block component Copolymer.

Polyacetal resin individually only can use a kind, it is also possible to be applied in combination two or more.

As polyacetal resin, following substances are not limited to, for example can also suitably using the polymer that molecular weight is different Combination or the different combination of Copolyacetal of amount of comonomers etc..

In present embodiment, as polyacetal resin, the block copolymer comprising block component is preferably used.

It should be noted that " block component " refers to each polymer for constituting polyacetal resin, being bonded in a molecule.

As polyacetal resin, such as PARA FORMALDEHYDE PRILLS(91,95) monomer or its 3 polymers (metaformaldehyde can be enumerated but be not limited to (Trioxane) cyclic oligomer of the formaldehyde such as) or 4 polymers (four polyformaldehyde (tetraoxane)) is carried out obtained from homopolymerization, in fact Polyacetal homopolymer in matter only containing oxidation MU；PARA FORMALDEHYDE PRILLS(91,95) monomer or its 3 polymers (metaformaldehyde) or 4 polymers The cyclic oligomer and oxirane of formaldehyde such as (four polyformaldehyde), expoxy propane, epoxychloropropane, 1,3- dioxolanes or 1, The cyclic ethers such as the cyclic formal of the ethylene glycol such as 4- butanediol formals or diethylene glycol or cyclic formal carry out copolymerization and The Copolyacetal for obtaining.

As Copolyacetal, it is also possible to use：Make the cyclic oligomer and simple function of the monomer and/or formaldehyde of formaldehyde Glycidyl ether carries out the Copolyacetal with side chain obtained from copolymerization；And enter with multifunctional glycidyl ether Copolyacetal with cross-linked structure obtained from row copolymerization.

Copolyacetal can also be with embedding with the different types of block component of the constitutional repeating unit of polyacetals Section copolymer.

In present embodiment, as block copolymer, preferably at least with any one of following formulas (1), (2), (3) The acetal homopolymer or acetal copolymer of the block component of expression (both is designated as block copolymerization sometimes in the lump hereinafter, Thing).

In above-mentioned formula (1) and (2), R₁And R₂Represented selected from hydrogen atom, alkyl independently of one another, replace alkyl, aryl With a kind in the group of substituted aryl composition, plural R₁And R₂Can be the same or different respectively.

R₃Represent a kind be selected from the group of alkyl, replacement alkyl, aryl and substituted aryl composition.

M represents 1～6 integer, preferably 1～4 integer.

N represents 1～10000 integer, preferably 10～2500 integer.

Block component represented by above-mentioned formula (1) is to depart from the residue after hydrogen atom from the alkylene oxide adducts of alcohol, Block component represented by above-mentioned formula (2) is to depart from the residue after hydrogen atom from the alkylene oxide adducts of carboxylic acid.

Polyacetal homopolymer with the block component represented by above-mentioned formula (1) or (2) for example can be special by Japan Open the method described in clear 57-31918 publications to be manufactured.

In above-mentioned formula (3), R₄Represent selected from hydrogen atom, alkyl, the group for replacing alkyl, aryl and substituted aryl composition In a kind, plural R₄Can be the same or different respectively.

P represents 2～6 integer, and two p each can be the same or different.

Q and r represent positive number respectively, and when q and r total is set to 100 moles of %, q is 2 moles of %～100 mole %, R is 0 mole of %～98 mole % ,-(CH (CH₂CH₃)CH₂)-unit and-(CH₂CH₂CH₂CH₂)-unit is respectively with random or embedding Segmented mode is present.

For the block component represented by any one of following formula (1), (2), (3), can be by making two end of composition Or single end has end of the compound of the block component of the functional groups such as hydroxyl in the polymerization process of polyacetals with polyacetals Part is reacted, so as to insert in polyacetal resin.

In as the block copolymer of polyacetal resin, the block component represented by above-mentioned formula (1), (2) or (3) insert Enter amount to be not particularly limited, when block copolymer is set to 100 mass %, more than preferably 0.001 mass % 30 mass % Below.

From obtaining sufficient modulus of elasticity in static bending aspect in practicality in resin gears, above-mentioned formula (1)～ (3) insertion of the block component represented by is preferably below 30 mass %, is gone out in terms of the tensile strength of resin gears Send out, the insertion of above-mentioned block component is preferably more than 0.001 mass %.

The lower limit of the insertion of above-mentioned block component be more preferably 0.01 mass %, more preferably 0.1 mass %, Still more preferably it is 1 mass %.

The higher limit of the insertion of above-mentioned block component is more preferably 15 mass %, more preferably 10 mass %, more More preferably 8 mass %.

From sufficient modulus of elasticity in static bending aspect in practicality is obtained in resin gears, in block copolymer The molecular weight of block component is preferably less than 10000, more preferably less than 8000, more preferably less than 5000.

The lower limit of the molecular weight of above-mentioned block component is not particularly limited, from persistently maintain stable sliding in terms of Set out, preferably more than 100.

The compound for forming the block component in block copolymer can be enumerated but be not limited to such as C₁₈H₃₇O(CH₂CH₂O)₄₀C₁₈H₃₇、C₁₁H₂₃CO₂(CH₂CH₂O)₃₀H、C₁₈H₃₇O(CH₂CH₂O)₇₀H、C₁₈H₃₇O(CH₂CH₂O)₄₀H or two end hydroxyalkylations Hydrogenated butadiene polymer etc..

For block copolymer, as bonding scheme, preferred ABA block polymer.

ABA block polymer refers to the block copolymer with the block component represented by above-mentioned formula (3), specifically Say, refer to the hydrogenated butadiene polymer segment B of polyacetals segments A (being hereinafter designated as A) and two end Jing hydroxyalkylations (hereinafter It is designated as B) block copolymer that constitutes according to the order of A-B-A.

It is 20g-I that block component represented by above-mentioned formula (1)～(3) can have iodine number₂The unsaturation of/below 100g Key.As unsaturated bond, it is not particularly limited, for example, can enumerates carbon-to-carbon double bond.

Copolyacetal with the block component represented by above-mentioned formula (1)～(3) can for example enumerate international public affairs The polyacetals block copolymer disclosed in No. 2001/09213 is opened, can be prepared by the method described in the publication.

By using above-mentioned A-B-A types block copolymer as block copolymer, with filling with glass system described later The tendency that the cementability on the surface of material is improved.As a result, the stretching with the resin gears that can improve present embodiment is disconnected Split the tendency of stress and the modulus of elasticity in static bending.

When polyacetal resin is set to 100 mass % integrally, the ratio of the block copolymer in polyacetal resin is preferred Below more than 5 mass % 95 mass %.

The lower limit of the ratio of the block copolymer is more preferably 10 mass %, more preferably 20 mass %, more enters One step is preferably 25 mass %.

The higher limit of the ratio of the block copolymer is more preferably 90 mass %, more preferably 80 mass %, more enters One step is preferably 75 mass %.

The ratio of the block copolymer in polyacetal resin can be utilized¹H-NMR or¹³C-NMR etc. is measured.

In addition, as polyacetal resin, preferably using the oxidation MU of the content relative to main chain of end OH bases Polyacetal resins of the 1mol for more than 0.006mol%.More preferably more than 0.007mol%, more preferably More than 0.008mol%, still more preferably be more than 0.01mol%.The upper limit of the content of end OH bases does not especially set, Preferably below 1mol%.

The content of end OH bases can be utilized¹Integration ratio in H NMR spectras is measured.As the solvent for being used, It is preferred that deuterated hexafluoroisopropanol, deuterochloroform and their mixed solvent.

As polyacetal resin, using the content of above-mentioned block copolymer or end OH bases for more than 0.006mol%'s Polyacetal resin, thus, the durability of the resin gears of present embodiment and quietness are improved.

Polyacetal resin composite used in the resin gears of present embodiment is preferably with respect to polyacetal resin 100 Mass parts include the glass system packing material below more than 10 mass parts 100 mass parts.

It is more than 10 mass parts by the content for making glass system packing material, mechanical strength or durability are improved.In addition, logical Crossing makes the content of glass system packing material connect for, below 100 mass parts, glass system packing material is mutual when can suppress shaping Touch the destruction of caused glass system packing material.Therefore, mechanical strength, durability are improved.Additionally, being filled by making glass system The content of material is below 100 mass parts, can carry out stable extrusion molding, can suppress the outward appearance of resin gears not It is good, quietness can be improved.

The lower limit of the content of glass system packing material is preferably 12 mass parts, more preferably 15 mass parts, further excellent Elect 20 mass parts as, be still more preferably 25 mass parts.

The higher limit of the content of glass system packing material is preferably 90 mass parts, more preferably 80 mass parts, further excellent Elect 75 mass parts as, be still more preferably 70 mass parts.

As the glass that can be used in polyacetal resin composite used in the resin gears of present embodiment It is packing material, can enumerates but be not limited to such as glass fibre, bead and foliated glass etc..

As glass fibre, such as chopped strand glass fibers, milled glass fiber, glass fibers can be enumerated but be not limited to Dimension rove etc..Wherein, from operability and the mechanical strength aspect of gear, preferred chopped strand glass fibers.

Glass system packing material individually only can use a kind, it is also possible to be applied in combination two or more.

The particle diameter of glass system packing material, fiber footpath and fiber length etc. are not particularly limited, it is possible to use any form Glass system packing material, when surface area is big, is increased with the contact area of polyacetal resin, and the durability of resin gears is improved, Thus it is preferred that.

In the case that glass system packing material is chopped strand glass fibers, average fiber footpath is preferably more than 7 μm 15 μm Below.

It is the resin-made tooth of present embodiment in above range by the average fiber footpath for making the chopped strand glass fibers The surface of wheel is smoothened, can improve quietness.Furthermore it is possible to the durability of the resin gears of present embodiment is improved, Pruning for die surface when being molded can be prevented simultaneously.

More preferably 8 μm, more preferably 9 μm of the lower limit of the average fiber footpath of above-mentioned chopped strand glass fibers.

More preferably 14 μm, more preferably 12 μm of the higher limit of average fiber footpath.

In present embodiment, the average fiber footpath of glass system packing material can be measured：In sufficiently high temperature (400 More than DEG C) under the resin gears of present embodiment are burned, after removing resinous principle and organic principle, using sweep type Electron microscope is observed to resulting ash content, and diameter is measured, such that it is able to be easily determined by the filling of glass system The average fiber footpath of material.In order to reduce error, the diameter of the chopped strand glass fibers of more than 100 is at least determined, is calculated Go out the mean value of fiber footpath.

As glass system packing material, two or more fiber footpath different glass fibres can be mixed and be used.

Glass system packing material is preferably processed with overlay film forming agent, makes modifying surface.

Overlay film forming agent is otherwise referred to as astringent.

As coating forming agent, such as carbamate resins, epoxy resin can be enumerated but be not limited to, with least 1 Plant copolymer resin of sour composition etc..

Wherein, preferably comprise the overlay film forming agent of the copolymer resin with least a kind sour composition.

As the above-mentioned copolymer resin with least a kind sour composition, preferably copolymer resin of the above-mentioned sour composition for carboxylic acid Fat, can enumerate but be not limited to for example：Contain carboxylic acid unsaturated ethylene thiazolinyl monomer with this comprising the thiazolinyl monomer of unsaturated ethylene containing carboxylic acid Copolymer of the unsaturated ethylene thiazolinyl monomer in addition as construction unit；Contain with this comprising the thiazolinyl monomer of unsaturated ethylene containing carboxylic acid anhydrides Copolymer etc. of the unsaturated ethylene thiazolinyl monomer beyond carboxylic acid anhydrides unsaturated ethylene thiazolinyl monomer as construction unit.Wherein, it is more excellent Choosing contains unsaturated ethylene thiazolinyl carboxylic acid unsaturated ethylene thiazolinyl monomer beyond with this using comprising the thiazolinyl monomer of unsaturated ethylene containing carboxylic acid Copolymer of the monomer as construction unit.

Overlay film forming agent individually only can use a kind, it is also possible to be applied in combination two or more.

As the thiazolinyl monomer of unsaturated ethylene containing carboxylic acid, such as acrylic acid, methacrylic acid, rich horse can be enumerated but be not limited to Acid, itaconic acid, maleic acid etc., preferred acrylic acid.

The thiazolinyl of unsaturated ethylene containing carboxylic acid monomer individually only can use a kind, it is also possible to be applied in combination two or more.

As the thiazolinyl monomer of unsaturated ethylene containing carboxylic acid anhydrides, the acid anhydrides of such as maleic acid or itaconic acid can be enumerated but be not limited to Deng.

The thiazolinyl of unsaturated ethylene containing carboxylic acid anhydrides monomer individually only can use a kind, it is also possible to be applied in combination two or more.

By the modifying surface with overlay film forming agent to glass system packing material, can improve and polyacetal resin The adhesive strength at interface, the average thickness increase of the composition comprising polyacetal resin on the surface of cover glass system packing material. Thus, durability is improved.Abrasion when sliding can further be suppressed, quietness can be improved.

Wherein, by the glass system packing material that Jing overlay films forming agent is modified and the polyacetal resin for including block component And/or the content of end OH bases relative to main chain oxidation MU 1mol for more than 0.006mol% polyacetal resin Be combined, so as to durability and quietness it is tremendous improve.

In present embodiment, glass system packing material can carry out surface and be modified with coupling agent.

Coupling agent is not particularly limited, it is possible to use known material.

As coupling agent, such as organic silane compound, organo titanate compounds, organo-aluminium can be enumerated but be not limited to Ester compound etc..

Coupling agent individually only can use a kind, it is also possible to be applied in combination two or more.

As organic silane compound, can enumerate but be not limited to such as VTES, vinyl-three- (2- methoxy ethoxies) silane, γ-methacryloxypropyl methoxy silane, gamma-amino propyl trimethoxy silicane, γ aminopropyltriethoxy silane, N- β-(amino-ethyl)-gamma-amino propyl trimethoxy silicane, β-(3,4- epoxide rings Hexyl) ethyl triethoxysilane, γ-glycidoxypropyl group methoxy silane, γ mercaptopropyitrimethoxy silane etc..

Wherein, preferred vinyl triethoxysilane ,-three-(2- methoxy ethoxies) silane of vinyl, γ-methyl-prop Alkene acryloxypropylethoxysilane methoxy silane, gamma-amino propyl trimethoxy silicane, γ aminopropyltriethoxy silane and γ-ring Oxygen propoxypropyl methoxy silane.From economy and the polyacetal resin composite of the resin gears for constituting present embodiment Heat endurance in terms of set out, preferred vinyl triethoxysilane, γ-glycidoxypropyl group methoxy silane and γ- Aminopropyltriethoxywerene werene.

As organo titanate compounds, such as tetraisopropyl titanate, tetra-n-butyl titanate, titanium can be enumerated but be not limited to Acid butyl ester dimer, four stearyl ester of metatitanic acid, triethanol amine titanate, titanium acetylacetone, lactic acid titanium, octylene glycol titanate, isopropyl Base (N- aminoethylamino ethyls) titanate esters etc..

As organic aluminates compound, such as acetyl alkoxyl diisopropyl acid aluminium etc. can be enumerated but be not limited to.

By using the glass system packing material being surface-treated using coupling agent, the resin-made tooth of present embodiment The durability of wheel has the tendency for further improving, while the heat endurance of resin gears has the tendency for further improving.

In polyacetal resin composite used in the resin gears of present embodiment, preferably comprising weight average molecular weight is Less than 500000 polyvinyl resin.

Polyvinyl resin individually only can use a kind, it is also possible to be applied in combination two or more.

The weight average molecular weight of polyvinyl resin is preferably less than 500,000.It is 50 by the weight average molecular weight for making polyvinyl resin Less than ten thousand, the generation of chip when being molded can be suppressed, while the friction system in the slip of the resin gears of present embodiment Number is reduced, and quietness is improved.

The weight average molecular weight of polyvinyl resin more preferably more than 10,000 is below 400,000, more preferably more than 1.5 ten thousand 30 Less than ten thousand, be still more preferably less than more than 20,000 20 ten thousand, much further preferably from less than more than 30,000 15 ten thousand.

The weight average molecular weight of polyvinyl resin can be measured using following methods.

A part for the sample or resin gears of polyacetal resin composite is cut out, hexafluoroisopropanol is impregnated in In (hereinafter referred to as HFIP), the polyacetal resin composition of dissolving is filtered.It should be noted that in the situation insoluble in HFIP Under, it is also possible to polyacetal resin composition is removed by hydrochloric acid decomposition etc..

Then, residue composition will not melted to be dissolved in trichloro-benzenes (hereinafter referred to as TCB) in 140 DEG C, filtered, So as to filter glass system packing material.Using resulting filtrate, entered by gel permeation chromatography (hereinafter referred to as GPC) Row is determined.

As the post for being used, the UT-807 (1) that Showa Denko K. K is manufactured and TOSOH Co., Ltd's manufacture GMHHR-H (S) HT (2) be connected in series.

Using TCB as mobile phase, sample solution concentration is 20mg～30mg (polyvinyl resin)/20ml (TCB).

Column temperature is 140 DEG C, and flow is 1.0ml/ minutes, using differential refractometer as detector, is measured.

In the calculating of weight average molecular weight, using polymethyl methacrylate (hereinafter referred to as PMMA) as reference material Matter is being calculated.PMMA standard substances now using number-average molecular weight 2,000 or so to 1,000,000 or so scope At least 4 samples.

With regard to the content of polyvinyl resin, relative to 100 mass parts of polyacetal resin, more than preferably 0.5 mass parts 8 matter Below amount part, below more than more preferably 1 mass parts 6 mass parts, more than more preferably 1.5 mass parts below 5 mass parts.

By make polyvinyl resin content be 0.5 mass parts more than, the sliding of the resin gears of present embodiment Well, and can long-time obtain stable sliding.And abrasion performance is also improved.

In addition, being below 8 mass parts by the content for making polyvinyl resin, the resin-made tooth of present embodiment can be suppressed Polyvinyl resin in chip when the reduction of the mechanical strength of wheel, the melting mixing of resin combination and resin gears into The disengaging for dividing.

The content of polyvinyl resin for example can be confirmed using following methods.

Polyacetal resin composite or resin gears are burned under sufficiently high temperature (more than 400 DEG C), removed Remove resinous principle.The content of glass system packing material is obtained by the weight of resulting ash content.

Then, the polyacetal resin to containing in polyacetal resin composite or resin gears carries out hydrochloric acid decomposition, by Residue deducts the mix ratio of the glass system packing material obtained before, and resulting value is the content of polyvinyl resin.Need It is bright, according to circumstances, it is also possible to confirm the presence or absence of other compositions by IR etc., carry out adding removing operation.

As the polyvinyl resin that can be used in present embodiment, the poly- second of such as extremely-low density can be enumerated but be not limited to Alkene, low density polyethylene (LDPE), high density polyethylene (HDPE), straight-chain low density polyethylene (LDPE) etc..Alternatively, it is also possible to use containing 5 mass % Vinyl copolymers of comonomer such as following propylene, butylene, octene etc..

Wherein, from reduction coefficient of friction and quietness aspect, preferred low density polyethylene (LDPE).

The polyvinyl resin that can be used in present embodiment preferably comprises at least a kind of fusing point (hereinafter referred to as Tm) Less than 115 DEG C of material.More preferably comprising the material that Tm is less than 110 DEG C.

It it is less than 115 DEG C by the Tm for making at least a kind in polyvinyl resin, coefficient of friction is low and highly stable, quiet Property can be long lasting for.In addition, when polyacetal resin composite is manufactured using melting mixing, may also function as extrusion is greatly reduced The effect of the moment of torsion of machine.Thus, it is possible to realize that conventional polyacetal resin and the composite of glass system packing material are difficult to Discharge rate increase.

In present embodiment, peak values of the Tm using the heat absorption for obtaining as follows：That is, using the examination of polyacetal resin composite Sample or from sample 4mg～6mg (carrying out sheet preferably by forcing press etc.) that resin gears cut out, is swept by differential Calorimetry (DSC) is retouched, the peak value of the heat absorption obtained when heating up with 10 DEG C/min.

Polyacetal resin composite used in the resin gears of present embodiment can be in the mesh for not damaging the present invention In the range of comprising the various stabilizers used in usual polyacetal resin composite.

As stabilizer, such as capturing agent of antioxidant, formaldehyde, formic acid etc. can be enumerated but be not limited to.

Stabilizer individually only can use a kind, it is also possible to be applied in combination two or more.

Used as antioxidant, from the heat endurance aspect for improving resin gears, preferred hindered phenol series are anti-oxidant Agent.As hindered phenol series antioxidant, it is not particularly limited, can suitably uses known material.

The addition of antioxidant relative to more than 100 mass parts of polyacetal resin preferably 0.1 mass parts 2 mass parts with Under.

As formaldehyde or the capturing agent of formic acid, can enumerate but be not limited to such as melamine, polyamide series resin etc. and contain There are formaldehyde reactivity nitrogen compound and its polymer；The hydroxide of alkali metal or alkaline-earth metal, inorganic acid salt, carboxylate Deng.

More specifically, calcium hydroxide, calcium carbonate, calcium phosphate, calcium silicates, line borate, fatty acid calcium salt can be enumerated (hard Resin acid calcium, calcium myristate etc.) etc..These aliphatic acid can replace with hydroxyl.

With regard to above-mentioned formaldehyde or the addition of the capturing agent of formic acid, relative to 100 mass parts of polyacetal resin, as formaldehyde Or the polymer containing formaldehyde reactive nitrogen of the capturing agent of formic acid is preferably more than 0.1 mass parts below 3 mass parts, alkaline earth gold The soap of category is preferably the scope more than 0.1 mass parts below 1 mass parts.

Do not damaging in the range of the purpose of the present invention, the polyacetal resin used in the resin gears of present embodiment Composition can also contain filling in the past known to used in polyacetal resin composite, beyond glass system packing material Material (talcum, wollastonite, mica, calcium carbonate etc.), conductivity-imparting agent (carbon black, graphite, CNT etc.), colouring agent (two Titanium oxide, zinc oxide, iron oxide, aluminum oxide, organic dyestuff etc.), slip imparting agent (various ester based compounds, the gold of organic acid Category salt etc.), ultra-violet absorber, light stabilizer, the various stabilizers such as lubricant.

With regard to the addition of other compositions, packing material, conductivity-imparting agent beyond glass system packing material, coloring In the case of agent, when polyacetal resin is set to 100 mass %, below preferably 30 mass %；In slip imparting agent, ultraviolet In the case of absorbent, light stabilizer, lubricant, relative to 100 mass % of polyacetal resin, below preferably 5 mass %.

Other compositions individually only can use a kind, it is also possible to be applied in combination two or more.

[manufacture method of polyacetal resin composite]

Polyacetal resin composite used in the resin gears of present embodiment can be by by above-mentioned polyacetals tree Fat, glass system packing material, stabilizer if necessary, method known to other components utilisings are mixed and melting mixing is making Make.

It should be noted that it is preferred that there are following operations：Using comprising at least a kind acid and with to glass system packing material Modifying surface function material, the operation to the modifying surface of glass system packing material；It is modified with by this Glass system packing material and the operation that mixed of polyacetal resin.

As material composition is mixed and melting mixing method, be not particularly limited, it is possible to use this area skill Method known to art personnel.

Specifically, can enumerate：Composition is mixed with super mixer, rotating cylinder, V-shape blender etc. in advance, Using the method for double screw extruder in the lump melting mixing；While composition is supplied to twin-screw extrusion owner throat being melted Mixing, from the method for the midway adding ingredient of extruder；Etc..

These methods can be used, and in order to improve the mechanical properties of the resin gears of present embodiment, preferably will Composition is supplied to twin-screw extrusion owner throat and carries out melting mixing, from the method for the midway adding ingredient of extruder.

Optimum condition is changed according to the size of extruder, preferably appropriate in the adjustable scope of those skilled in the art Adjustment.It is further preferred that with regard to the screw design of extruder, it is also possible to carry out in the adjustable scope of those skilled in the art Various adjustment.

In the case of compounding ingredients, it is also possible to be added from the midway of extruder, but preferably supply from main throat.It is logical Cross and take this preparation method, it is surprising that the tendency of the effect with the moment of torsion that can also obtain extruder is greatly reduced.By This, can greatly improve productivity ratio.

[manufacture methods of resin gears]

The resin gears of present embodiment can by using known method by above-mentioned polyacetal resin composite into Type is manufacturing.

It is not particularly limited with regard to forming method, it is possible to use known forming method.

Specifically, extrusion molding, injection moulding, vacuum forming, blow molding, injection compression molding, dress can be enumerated Decorations shaping, other material shapings, air-auxiliary injection forming, foam injection molding, low pressure molding, ultra-thin-wall injection moulding are (super High speed injection molding), the forming method such as composite molding (injection mo(u)lding on insert molding, matrix) in mould.Among these, preferably Injection moulding.

[characteristics of resin gears]

(overstrains of resin gears)

Resin gears in present embodiment have gear ring portion and are arranged at the teeth portion of the peripheral part in the gear ring portion.

Dependent variable c (%) is 0.9 percentage with the difference (d-c) (hereinafter designated as " overstrain ") of dependent variable d (%) Point is following, and above-mentioned dependent variable c (%) is for above-mentioned gear ring portion or for above-mentioned gear ring portion and above-mentioned teeth portion carry out 1 75MPa Load and the unloading from 75MPa to 15MPa after resin gears dependent variable, above-mentioned dependent variable d (%) is to be repeated The dependent variable of the resin gears after the load of 50 75MPa and the unloading from 75MPa to 15MPa.

Above-mentioned overstrain (d-c) be preferably less than 0.8 percentage point, more preferably less than 0.7 percentage point, it is further Preferably less than 0.6 percentage point.

Overstrain (d-c) is relevant with the plastic deformation under stress.It is less than 0.9 percentage point by making the value, this reality The durability and quietness for applying the resin gears of mode is excellent.

The overstrain of resin gears can utilize the method described in aftermentioned embodiment to be measured.Need explanation It is that the area of pressure head can be suitably changed according to the size of gear.The value base of overstrain, elastic strain and computer simulation Do not affected by indenter area in sheet.

(elastic strains of resin gears)

In addition, the resin gears in present embodiment have gear ring portion and are arranged at the tooth of the peripheral part in the gear ring portion The resin gears in portion, wherein, the difference (b-c) (hereinafter designated as " elastic strain ") of dependent variable b (%) and dependent variable c (%) For less than 2.5 percentage points, above-mentioned dependent variable b (%) is for above-mentioned gear ring portion or for above-mentioned gear ring portion and above-mentioned teeth portion The dependent variable during load of 1 75MPa is carried out, above-mentioned dependent variable c (%) carries out 1 unloading from 75MPa to 15MPa for it afterwards Dependent variable after load.Above-mentioned elastic strain (b-c) be preferably less than 2.0 percentage points, be more preferably less than 1.8 percentage points, More preferably less than 1.6 percentage points.

Elastic strain (b-c) is relevant with the elastic deformation under stress.It is less than 2.5 percentage points by making the value, gear Durability and quietness it is excellent.

The elastic strain of resin gears can utilize the method described in aftermentioned embodiment to be measured.

(computer simulations of resin gears)

In addition, for the resin gears in present embodiment, by above-mentioned overstrain (d-c) divided by dependent variable d (%) value ((d-c)/(d-a)) and obtained by the difference (d-a) of dependent variable a (%)：Computer simulation) for less than 0.50, it is above-mentioned In the difference (d-a) of dependent variable d (%) and dependent variable a (%), above-mentioned dependent variable d (%) is for above-mentioned gear ring portion or for above-mentioned Gear ring portion and above-mentioned teeth portion the load of 50 75MPa and the unloading from 75MPa to 15MPa is repeated after gear strain Amount, the dependent variable when load reaches 15MPa when above-mentioned dependent variable a (%) is the load for having carried out 1 time from 0MPa to 15MPa. Computer simulation ((d-c)/(d-a)) is preferably less than 0.48, more preferably less than 0.46, more preferably less than 0.44.

Computer simulation ((d-c)/(d-a)) is relevant with the plastic deformation under stress.It is less than 0.50 by making the value, tooth The durability and quietness of wheel is excellent.

The computer simulation of resin gears can utilize the method described in aftermentioned embodiment to be measured.

The schematic plan of one of resin gears of present embodiment is shown, during Fig. 1 is shown in Fig. 2 in Fig. 1 The schematic sectional view of the resin gears at dotted line X-Y.

In this specification, " spur gear " refers to the gear for abreast having tooth with rotary shaft.

Resin gears shown in Fig. 1 possess：Inner peripheral portion 10 with centre bore；The thickness gear ring bigger than the inner peripheral portion 10 Portion 2；With the teeth portion 1 of the peripheral part for being arranged at the gear ring portion 2.

When the above-mentioned overstrain of resin gears of present embodiment, elastic strain, computer simulation is determined, such as scheme One illustrated in 3 is such, for gear ring portion 2 and the teeth portion 1 of the resin gears with the shape for example shown in Fig. 1, Fig. 2, The use of contact surface is plane pressure head 4, is contacted the pressure head 4, direction of arrow imposed load in figure 3 then subtracts The little load and unloaded.

With regard to load, according to the areal calculation of resin gears and the contact site of pressure head 4 go out stress reach 15MPa and The value of 75MPa.

The speed of load and unloading is 1mm/min.It should be noted that with regard to load and unloading, at least any 3 points with On calculated, calculate mean value.

Herein, with regard to resin gears and the contact site area of pressure head 4, as shown in figure 4, illustrating with gear ring portion 2 and tooth The face of the contact portion 5 (oblique line portion) of gear and pressure head in part, i.e. Fig. 4 that the gear in portion 1 is contacted with plane pressure head 4 Product.

The schematic plan of another of resin gears of present embodiment is shown, during Fig. 5 is shown in Fig. 6 in Fig. 5 The schematic sectional views of resin gears cut of dotted line X-Y.

For the resin gears shown in Fig. 5 and Fig. 6, gear ring portion 2 is different from the thickness of teeth portion 1.

It should be noted that in the case of for the resin gears different from the thickness of teeth portion 1 of gear ring portion 2, such as Fig. 7 institutes Show, load and unloading are carried out to gear ring portion 2 only.

The schematic plan of another of resin gears of present embodiment is shown in Fig. 8.

The resin gears of Fig. 8 are the spur gears of the gear ring portion structure integrated with teeth portion.

In the case of for this spur gear, as shown in figure 9, for the area equivalent to gear ring portion with teeth portion and its inner side Domain carries out load and unloading.

Resin gears and the contact area of pressure head 4 be not substantially to overstrain (d-c), elastic strain (b-c) and residual The value of remaining strain rate ((d-c)/(d-a)) produces impact.

In addition, the facewidth 3 of resin gears does not also substantially produce impact to these values.

To obtain in the measure of the overstrain of the resin gears in present embodiment, elastic strain and computer simulation Load-unloading curve one be illustrated in Figure 10.

Initially carry out until 75MPa load during reach 15MPa point be A, carry out the load of 1 75MPa Point be B, the point for carrying out 1 unloading from 75MPa to 15MPa afterwards is C, and the point that 50 load and unloading are repeated is D.

By the displacement at each point divided by the facewidth 3, dependent variable (%) is thus calculated.

Overstrain (d-c) is the dependent variable at dependent variable (%) (suitable with above-mentioned dependent variable d) and point C at point D (%) difference (percentage point) of (suitable with above-mentioned dependent variable c).

Elastic strain (b-c) is the dependent variable at dependent variable (%) (suitable with above-mentioned dependent variable b) and point C at point B (%) difference (percentage point) of (suitable with above-mentioned dependent variable c).

In addition, computer simulation ((d-c)/(d-a)) is divided by the dependent variable at point D by above-mentioned overstrain (d-c) (%) (suitable with above-mentioned dependent variable d) is obtained with the difference (d-a) of the dependent variable (%) (suitable with above-mentioned dependent variable a) at point A Value.

It is specific as overstrain (d-c), elastic strain (b-c) and computer simulation ((d-c)/(d-a)) are controlled to The method of scope, is not particularly limited, as described above, using block copolymer and/or end OH bases as polyacetal resin Content is the material of more than 0.006mol%, uses using the overlay film comprising acid relative to the oxidation MU 1mol of main chain The modes such as the glass system filler processed by forming agent are effective.

Particularly, if sharing block copolymer and the overlay film forming agent comprising acid, polyacetal resin is filled with glass system The cementability at the interface of material is improved tremendously, is easily controlled to overstrain, elastic strain and computer simulation above-mentioned Desired scope.

In addition, in order that the intensity of the resin gears of present embodiment, i.e. overstrain, elastic strain and overstrain Rate is above range, when the polyacetal resin composite as the material of resin gears is manufactured by melting mixing, by glass Glass system packing material is also effective with the mixing that polyacetal resin carries out the longer time.In general, in polyacetal resin group During the melting mixing of compound, it is believed that glass system packing material is preferably kneaded with shorter time, but is had in present embodiment Contrary tendency.Specifically, in the case of supplying glass system packing material from side feeder in extrusion mixing, as preferred Method can be enumerated from more upstream side and be supplied.

Overstrain be with drive in gear in the state of the relevant value of the dependent variable accumulated.Gear has following spies Property：In rotation driving there is occlusion with tooth, separate in tooth, and rotation is engaged with identical tooth after 1 week again.Therefore, make repeatedly to bear Lotus is by load, unloading.Now the dependent variable of stored Plot is fewer, then gear more is difficult to deform.Therefore, except the durability of gear is carried Beyond height, change in size reduces, and quietness is improved.

Elastic strain is the value relevant with dependent variable when applying certain moment of torsion to gear.Particularly, according to purposes not Together, maintenance applies several seconds, is several little sometimes afterwards to also have sometimes applying to lock moment of torsion (ロッ Network ト Le Network) beyond the height for using moment of torsion When the load state gear.Now produced elastic strain amount is fewer, then the running accuracy under inactive state is more excellent. In addition, micro-strain when can suppress engaged gears, so as to quietness is improved.

In addition, computer simulation is also identical with overstrain, be with drive in gear in the state of the dependent variable accumulated Relevant value.The value is less, then the durability and quietness of gear is higher.

(composition on the surface of cover glass system packing material)

As described above, the resin gears of present embodiment are using containing polyacetal resin and glass system packing material In the case that resin combination is molded with, when the resin gears are broken, project from the plane of disruption of the gear of fracture The surface of glass system packing material is preferably averaged the composition comprising polyacetal resin that thickness is less than more than 0.2 μm 3.0 μm Covered.

It it is more than 0.2 μm by the average thickness for making the composition comprising polyacetal resin, with durability, dedendum strength Etc. the tendency that mechanical strength is improved.It is additionally possible to suppress chip, and the bad order of the gear obtained by can suppressing, because And there is the tendency of quietness raising.Additionally, molding cycle shortens, thus the tendency improved with productivity ratio.

In addition, be less than 3.0 μm by the average thickness for making the composition comprising polyacetal resin, with bunching can be suppressed The mobility of urea formaldehyde composition reduces, suppresses the tendency of the bad order of resin gears.

More preferably 0.3 μm, more preferably 0.4 μm of the lower limit of the average thickness.

More preferably 2.5 μm, more preferably 2.0 μm of the higher limit of the average thickness.

Breaking for above-mentioned resin gears is carried out with draw speed 50mm/min.

In present embodiment, the surface of the glass system packing material projected to the plane of disruption from the resin gears broken is entered Average thickness that row is covered, the composition comprising polyacetal resin composite can be by being seen with SEM (SEM) Examine the plane of disruption of the resin gears broken to obtain.

Although being not particularly limited, as glass system packing material, by taking glass fibre as an example, below to above-mentioned comprising poly- The assay method of the average thickness of the composition of acetal resin is specifically described.

In the resin gears of present embodiment, combine comprising polyacetal resin on the surface for determining cover glass fiber During the average thickness of the composition of thing, as the glass fibre for being determined, the plane of disruption in the resin gears broken is preferably selected The existing nearby glass fibre in central authorities.

First, at least 50 glass fibres projected from the plane of disruption are randomly chosen.Then, to covering the glass fibers dimension table The layer of the composition in face is observed, and determines the thickness of this layer.This layer it is in uneven thickness when, using maximum as this layer Thickness.Also, arithmetic average is carried out to the thickness of 50 layers, so as to calculate average thickness.

It should be noted that glass fibre be uniformly coated with resinous principle in the case of, glass fibre with cover The border of the layer of the composition of cap surface is sometimes unclear.In this case, when the thickness of the layer for covering surface is calculated, can be with Calculated using the single diameter of glass fibre.For example, being uniformly coated with the glass fibre that section is circle In the case of resinous principle, the thickness for covering the layer on surface is obtained by following formula.

Cover thickness=(including the diameter of the diameter-glass fibre of layer)/2 of the layer on surface

The single diameter of glass fibre can be by being measured to the residue after resinous principle is removed from resin gears And obtain.

Method as resinous principle is removed from resin gears, for example, can enumerate：In (400 DEG C of sufficiently high temperature More than) under method that the resinous principle in resin gears is burned；Impregnated in the solvent of dissolving polyacetal resin, will The method that resinous principle in resin gears is removed；Etc..

In present embodiment, the surface in terms of area ratio preferably more than 50% of preferred glass system packing material, more preferably More than 70%, further preferred more than 80%, still more preferably more than 90% covered by the composition comprising polyacetal resin.

It is 50% by the area ratio for making the composition comprising polyacetal resin on the surface of cover glass system packing material More than, the durability of the resin gears of present embodiment is further improved.

In order that it is less than more than 0.2 μm 3.0 μm comprising polyacetals that the surface of glass system packing material is averaged thickness The composition of resin is covered, for example, can enumerate：As polyacetal resin, using above-mentioned block copolymer and/or end OH The content of base relative to main chain oxidation MU 1mol for more than 0.006mol% material；With using above-mentioned comprising acid Material as overlay film forming agent；Etc..

Wherein, if sharing block copolymer and the overlay film forming agent comprising acid, polyacetal resin fills material with glass system The cementability at the interface of material is improved tremendously, the composition comprising polyacetal resin on the surface of cover glass system packing material Average thickness increases.

In addition, in order that the average thickness be above range in, polyacetal resin composite is being manufactured by melting mixing When, it is also effective with the mixing that polyacetal resin carries out the longer time by glass system packing material.In general, in resin group During the melting mixing of compound, it is believed that glass system packing material is preferably kneaded with shorter time, but is had in present embodiment Contrary tendency.Specifically, in the case of supplying glass system packing material from side feeder in extrusion mixing, can enumerate Supplied from more upstream side.

In present embodiment, constitute cover glass system packing material surface it is layer, comprising polyacetal resin composite Composition in, polyacetal resin is main component, or the above-mentioned resin comprising polyvinyl resin and/or stabilizer etc. Composition.

(amount of the polyvinyl resin in the top layer of gear)

The preferred situations below of resin gears of present embodiment：At playing 1,000 μm on the top layer away from resin gears The amount for carrying out the polyvinyl resin within the top layer 10nm in face that deep layer cutting is obtained is compared, the top layer of the resin gears The amount of the polyvinyl resin within 10nm is more.

The amount of polyvinyl resin can be by the relative elemental of the carbon C determined using x-ray photoelectron optical spectroscopy (XPS) Concentration (atomic%) is calculated.

As device is determined, for example, can enumerate ESCALAB250 of Fisher Scientific Co., Ltd. manufacture etc..

As excitaton source when determining, monoAlK α etc. are preferably used.

In addition, the impact in order to remove the attachment pollutant component for being attached to gear surface, with cleaning agent (such as VALTRON The aqueous solution of DP97031) ultrasonic wave cleaning is carried out to gear surface, and cleaned with pure water, it is dried in baking oven etc..

In XPS is determined, Binding 286～288eV of Energy are the carbon from polyacetal resin, 284～286eV It is the carbon from alkene such as polyethylene, thus in the case of peak energy is enough detached, only uses the carbon of the composition from polyethylene, Cannot it is detached in the case of, it is possible to use the peak area of the scope of 284～288eV.

Concentration of carbon within the 10nm of top layer away from resin gears is designated as into C₁, by the central part to resin gears (the deep layer portion of 1,000 μm of gear) carries out cutting the concentration of carbon within the top layer 10nm in the face for obtaining and is designated as C₂And when using, it is excellent Following formula is selected to set up.

[C₁]/[C₂]>1

When above formula is set up, it may be said that (C) polyvinyl resin is more present within the 10nm of top layer.

More preferably 1.01≤[C₁]/[C₂]≤1.20, more preferably 1.02≤[C₁]/[C₂]≤1.18, more enter one Step is preferably 1.05≤[C₁]/[C₂]≤1.15。

Using the block copolymer with the block component represented by above-mentioned formula (3) as polyacetal resin in the case of, The concentration of carbon of polyacetal resin increases itself.

But, the deep layer portion within 10nm is played away from top layer with 1,000 μm, the concentration of carbon from polyacetal resin be not poor It is different, thus during above formula establishment, it may be said that polyvinyl resin is more present within the 10nm of top layer.

It should be noted that in the resin gears of present embodiment, making measure C₂Position for resin gears 1, 000 μm of deep layer portion, but in the resin gears of present embodiment, if playing 100 μm of deep layer portion away from the top layer, then with portion Independently, amount and the rate of charge of polyvinyl resin are substantially identical value for position.

As described above, the amount of the polyvinyl resin within making top layer 10nm is more than on the top layer away from resin gears The amount of the polyvinyl resin within the top layer 10nm in face that deep layer cutting is obtained is carried out at 1000 μm, thus, is particularly slided The sliding at dynamic initial stage is improved.In addition, by a small amount of mixture polyethylene, can with tremendous the effect for improving sliding, Thus the reduction of the mechanical strengths such as the modulus of elasticity in static bending can be suppressed.Further, it is also possible to obtain flying when kneading with resin melting Jump property ground suppresses the surprising effect of chip.

It should be noted that in the case of resin gears of the thickness less than 2,000 μm, it is possible to use resin gears Depth direction central part concentration of carbon replacing the concentration of carbon in 1,000 μm of deep layer portion.

In order that the deep layer portion of polyvinyl resin within 10nm than 1,000 μm of gear is played on top layer away from resin gears Exist more, the weight average molecular weight of the polyvinyl resin of mixture can be less than 500,000 realizing by making.In addition, by making The fusing point of polyvinyl resin is less than 115 DEG C, can make polyvinyl resin within the 10nm of top layer away from resin gears Deep layer portion of the amount more than 1,000 μm of resin gears.

[purposes]

The durability of the resin gears of present embodiment, mechanical strength and quietness are excellent, thus suitably can use In various uses.

Particularly, as said gear, can enumerate but be not limited to such as helical gear, spur gear, internal gear, tooth bar, people Word gear, straight bevel gear, helical bevel gear, spiral bevel gear, ring gear, face gear, helical gear, turbine, turbine Gear, hypoid gear and wildhaber-novikov gear.In addition, above-mentioned helical gear or spur gear etc. can also be by single gear and Two-stage gear and drive motor carry out multistage-combination, reduce rotation inequality and have the built-up gear of the structure of deceleration.

As the part for being suitable for the gear, be not limited to components described below, can for example enumerate cam, slide block, lever arm, Clutch, felt clutch, idle pulley, pulley, roller, roller, key lever, key top, roller shutter, spool, rotary shaft, joint, axle, bearing and Guider.In addition, can also enumerate the resin component of injection mo(u)lding on matrix, the resin component of insert molding, chassis, Pallet and side plate.

As the particular use of said gear, following purposes is not limited to, for example, can enumerate business automation equipment knot Structure part, camera or camera apparatus structure member, music, image or information equipment structure member, communication equipment are used Structure member, electrical equipment structure member, electronic equipment structure member, automobile structure member (car door circumferential component, Vehicle seat circumferential component, air-conditioner circumferential component), the structure member of bicycle (drive motor transmission etc.), switch block, stationery knot Structure part, the structure member for living equipment, automatic vending machine structure member, the structure member of motion/leisure/amusement relevant device And the structure member of commercial plant.

In addition, the resin gears of present embodiment can keep significantly excellent resistance to compared with existing resin gears Property and quietness, from this viewpoint, go in whole automobile, electric motor car long.Herein, as above-mentioned electric motor car, can To enumerate but be not limited to for example old carriage, motorcycle and electric two-wheel vehicle.

The resin gears of present embodiment are preferably coated with lubricating grease and use.Thus, durability and quietness can be big Width is improved.

Embodiment

Below, specific embodiment and comparative example are enumerated to illustrate present embodiment, but present embodiment is not limited Due to embodiment described later.

The manufacturing condition and scoring item of polyacetal resin composite and resin gears used in embodiment and comparative example Mesh is as follows.

[manufacturing conditions of polyacetal resin composite and resin gears]

(the manufacturing condition of (1) polyacetal resin composite：Extrusion condition)

Following co-rotating twin screw extruders (toshiba machine strain formulas used in the manufacture of polyacetal resin composite Commercial firm manufactures TEM-48SS extruders), wherein, ratios (L/D)=48 (machine barrel number 12) of the spiro rod length L relative to screw diameter D, There is side feeder in the 6th machine barrel and the 8th machine barrel, possess vaccum exhaust outlet in the 11st machine barrel.

By the 1st machine barrel water-cooled, it is 210 DEG C by the 2nd～the 5th barrels set, is 180 DEG C by the 6th～the 12nd barrels set.

Screw rod used in extrusion is following design.

Thread screw (Off ライトス Network リュー, hereinafter referred to as FS) is configured in the position of the 1st～the 4th machine barrel, The position of the 5th machine barrel configure successively 2 have feeding ability kneading discs (hereinafter referred to as RKD), 2 do not feed ability Kneading disc (hereinafter referred to as NKD) and 1 with the kneading disc to reverse feeding ability (hereinafter referred to as LKD)。

In the position configuration FS of the 6th～the 8th machine barrel, each 1 RKD and NKD is configured successively in the position of the 9th machine barrel, the The position configuration FS of the 10～the 11st machine barrel.

By the side feeder supply glass system packing material of the 8th machine barrel, screw speed is made for 150rpm, make total extrusion capacity be 70kg/h obtains the particle of polyacetal resin composite being extruded.

(manufacturing conditions of (2) resin gears)

In the manufacture of resin gears, using injection (mo(u)lding) machine (FANUC Roboshot (registration mark) i50B types, FANUC Co. Ltd. systems).

Used as condition of molding, resin temperature is 200 DEG C, and mold temperature is 80 DEG C, and injection pressure and pressurize are 100MPa.

Spur gear is produced by injection moulding, the spur gear it is a diameter ofModulus=1.0, the number of teeth=50, tooth A width of 8mm, with the gear ring portion that width is 1.5mm.

In 3 points of configuration cast gates of web (web) so as to be spaced in circumferencial direction and homogenized with 120 degree.

[evaluating characteristics of resin gears]

(dependent variables of (1) resin gears)

Using universal testing machine (5566 types of INSTRON (registration mark), the manufacture of INSTRON societies).

Resin gears are set in plane, the gear ring portion and teeth portion to resin gears applies compression load and comment Valency.

Pressure head of the pressure head using the circular plan shape of a diameter of 1cm.

Compression load is the direction of the web surface perpendicular to resin gears.

Resin gears as shown in Figure 4 calculate stress with the area (oblique line portion in Fig. 4) of the contact portion 5 of pressure head The load of 15MPa and 75MPa is reached, load and unloading until the compression load suitable with this is repeated 50 times.

The speed of load and unloading is 1mm/min.

Strain after to carrying out 1 load and unloading and the strain after 50 load and unloading are repeated are measured, By each dependent variable divided by the facewidth, so as to calculate dependent variable (%).

Illustrate in Figure 10 by load-unloading curve obtained from the compression test in embodiment described later 1.

Illustrate in Figure 11 by load-unloading curve obtained from the compression test in comparative example described later 5.

Overstrain：Dependent variable (%) at dependent variable (%) (suitable with above-mentioned dependent variable d) at point D and point C (with it is upper State dependent variable c suitable) difference (percentage point).

Elastic strain：Dependent variable (%) (suitable with above-mentioned dependent variable b) at point B (is answered with above-mentioned with the dependent variable at point C Variable c is suitable) difference (percentage point).

Computer simulation：By above-mentioned overstrain (d-c) divided by the dependent variable (%) at point D (with above-mentioned dependent variable d phase When) with obtained from the difference (d-a) of the dependent variable (%) (suitable with above-mentioned dependent variable a) at point A be worth ((d-c)/(d-a)).

Thus, overstrain, elastic strain and computer simulation are calculated.

Any 3 points are tested, using mean value.

(average thickness of the layer of the composition on the surface of (2) cover glass system packing material)

The test film of 5mm × 5mm × 1mm is cut out from resin gears, using cupping machine with the drawing of 50mm/min Stretching speed makes which rupture.

In the plane of disruption evaporation platinum of test film, so as to produce observation test film.

Using observation test film, observed by SEM (SEM), filled out so as to determine cover glass system Fill the thickness of the layer of the composition on the surface of material.

Observed with observing multiplying power 5,000 again.

As look-out station, it is the plane of disruption central portion of test film, is adjusted to observe the plane of disruption central portion.

In the glass system packing material projected from the plane of disruption, select arbitrary 50.

In whole glass systems packing material, it is thus identified that section is uniformly covering for circular glass system packing material Resinous principle is covered.

Then, determine the diameter of the glass system packing material covered by resinous principle.

In addition, burning test film 3 hours at 450 DEG C in advance and removing resinous principle, glass system packing material is obtained Diameter (mean values of 100), obtains attachment according to diameter and its difference of the glass system packing material covered by resinous principle In the thickness of the resinous principle on surface.

Arithmetic average is carried out to 50, as the average thickness of the layer of the composition on the surface of cover glass system packing material.

(the presence ratio (surface polyethylene ratio) of the polyvinyl resin in the top layer of (3) resin gears)

The x-ray photoelectron optical spectroscopy (XPS) manufactured using Thermo Fisher Scientific Co., Ltd. ESCALAB250, using monoALK α (15kV × 10mA) as excitaton source.

Analysis size is 1mm square.

In order to remove the attachment on the top layer of resin gears, using commercially available precision equipment cleaning agent (VALTRON DP97031 1.5% aqueous solution), carries out ultrasonic wave cleaning in 3 minutes under conditions of 50 DEG C, removes the organic matter on surface, afterwards 15 minutes ultrasonications are carried out with distilled water at ambient temperature using high performance liquid chromatography, implements cleaning.

Next, the resin gears after cleaning are carried out into 1 hour dried process in drying oven in 80 DEG C, for surveying It is fixed.

In the measure, it is 0 ° (vertical with gear surface) that photoelectron takes out angle, and it is to make full scan (Survey to measure region Scan be) 0～1100eV, narrow scan (Narrow Scan) carbon C for 1s region.

In addition, it is logical can (Pass Energy) with full scan as 100eV, narrow scan implemented for 20eV.

Peak area ratio of the C concentration now for the scope of 284eV to 288eV.

Relative elemental concentrations are calculated by area ratio, is rounded up, with 2 in the case of more than 1atomic% Significant digits are calculated, and are calculated with 1 significant digits in the case of less than 1atomic%.

Concentration of carbon in the top layer of resin gears is designated as into [C₁]。

Then, the central authorities of the thickness direction of resin gears are cut using ultramicrotome, and (top layer away from gear is 4mm), the concentration of carbon [C near the central portion using same measure to thickness direction₂] be measured.

Calculate [C₁]/[C₂], as " the presence ratio of the polyvinyl resin in the top layer of gear ".

((4) durability)

Using gear durability-testing machines (in high torque gear durability-testing machines NS-1, (having), river makes manufactured), determine The durability of resin gears.

By metal gear (diameterModulus=1.0, the number of teeth=50, facewidth 20mm) as coupling gear, add one Fixed operation torque, determines (time time till resin gears rupture：Hour).

Operation torque is carried out with 3 levels of 5.0Nm, 5.5Nm and 6.0Nm.

Rotating speed is 100rpm.

Test is carried out in 23 DEG C, the thermostatic chamber of humidity 50%.

((5) quietness)

As resin gears, spur gear is manufactured by injection moulding, the spur gear it is a diameter ofModulus= 1.0th, the number of teeth=50, the facewidth are 8mm, with the gear ring portion that width is 1.5mm.

Also, as metal gear, using diameterModulus=1.0, the number of teeth=10, the metal-toothed of facewidth 8mm Wheel.

In noise reduction room, above-mentioned resin gears is engaged with above-mentioned metal gear, continuously drive.

Rotating speed is 100rpm.

Microphone is set for the position of 50mm in the axle apart from above-mentioned metal gear.

The noise (dB) after operation start after 10 hours is determined using noisemeter (according to JIS C1502).

[material compositions of polyacetal resin composite and resin gears]

Then, below to the raw material of embodiment and the polyacetal resin composite used in comparative example and resin gears into Divide and illustrate.

(polyacetal resin)

As polyacetal resin, using following (A1)～(A4).

(A1) ProductName：Tenac (registration mark)-C 4520 (Asahi Chemical Corp's manufacture), copolymer, melt Flow rate (MFR)=9.0g/10 minutes, number-average molecular weight Mn=about 70,000, relative to the oxidation MU 1mol of main chain End OH base contents=0.0055mol%

(A2) ProductName：Tenac (registration mark) MG210 (Asahi Chemical Corp's manufacture), homopolymers, melt flow Dynamic speed (MFR)=1.7g/10 minutes

(A3) polyacetals block copolymer is prepared as follows.

The jacketed dual-axis paddle continuous polymerization machine that pass through can thermal medium is adjusted to into 80 DEG C.By metaformaldehyde with 40 Mol/hr, using as the 1,3- dioxolanes of cyclic formal using 2 mols/hr, by being dissolved in as polymerization catalyst Boron trifluoride di-n-butyl etherate in hexamethylene with relative to 1 mole of metaformaldehyde as 5 × 10^-5Mole amount, will Two terminal hydroxyl hydrogenated butadiene polymers (number-average molecular weight Mn=2,330) represented by following formula (4) as chain-transferring agent with Relative to metaformaldehyde, 1 mole is 1 × 10^-3Mole amount be continuously fed into above-mentioned polymerization machine, be polymerized.

Then, the polymer discharged from above-mentioned polymerization machine is put in 1% aqueous solution of triethylamine, is carried out completely polymerization catalyzed After the inactivation of agent, polymer is carried out filtering, cleaned, obtain thick polyacetals block copolymer.

Relative to resulting thick 100 mass parts of polyacetals block copolymer, addition (is recorded in day containing quaternary ammonium compound In No. 3087912 publication of national patent) 1 mass parts of the aqueous solution, it is uniform to mix.With regard to the addition of quaternary ammonium compound, change Nitrogen quantity is counted as 20 mass ppm.The double screw extruder with exhaust outlet is fed to, relative to the poly- of the melting in extruder 100 mass parts of acetal block copolymer, add 0.5 mass parts of water.With the stop in 200 DEG C of extruder design temperature, extruder The condition of 7 minutes time, the decomposition for carrying out the unstable end section of polyacetals block copolymer are removed.

Add in the polyacetals block copolymer that unstable end section is decomposed triethylene glycol as antioxidant- Double [3- (the 3- tert-butyl group -5- methyl -4- hydroxy phenyls)-propionic esters] 0.3 mass parts, in the extruder with exhaust outlet, true Devolatilization is carried out under conditions of reciprocal of duty cycle 20Torr, while being extruded in the form of strands from extruder die oral area, is granulated.

Using so obtained polyacetals block copolymer as (A3) polyacetals block copolymer.The block copolymer is ABA block polymer, melt flow rate (MFR) are 15g/10 minutes (ISO-1133 conditions D).Calculated by melt flow rate (MFR) Number-average molecular weight Mn be for about 50,000.Relative to the end OH base contents of the oxidation MU 1mol of main chain it is 0.0103mol%.

(A4) replace above-mentioned two terminal hydroxyls hydrogenated butadiene polymer and use ethylene glycol, it is same with above-mentioned (A3) in addition Carry out sample, obtain polyacetal resin.Relative to the end OH base contents of the oxidation MU 1mol of main chain it is 0.0078mol%.

It should be noted that the end OH bases content in polyacetal resin is measured using following methods.

Polyacetal resin 10mg is put in mixed solvent (mass ratio 1/1) 1mL of the hexafluoroisopropanol with chloroform, one is placed Dinner.Further heat 4 hours at 40 DEG C so as to dissolve.

Then, double (trimethyl silyl) trifluoroacetamide 0.2mL of N of the addition as silylating agent, O-, 40 DEG C heating 2.5 hours.Open in air, air-dry a Dinner, after confirming solvent volatilization, a Dinner is vacuum dried at 80 DEG C.

The polyacetal resin 10mg that obtain in aforesaid operations, end has been carried out trimethylsilylation is molten at 55 DEG C Solution in mixed solvent (volume ratio 1/1) 0.8mL of hexafluoroisopropanol-d and chloroform-d, as NMR measurement samples.

Using Jeol Ltd.'s manufacture ECA500 type, carry out¹The measure of H NMR.According to resulting spectrogram, will The integrated value at the peak (belonging to oxidation MU) of 4.95ppm (is belonged to by the peak of 0.17ppm～0.23ppm as benchmark In the end OH yls of Jing trimethylsilylations) integrated value calculate end OH base contents.

(glass system packing material)

Glass system packing material uses following substances.

(B1) using No. 4060831 publication of Japan's patent Production Example 1 described in overlay film forming agent (containing propylene Acid and the copolymer of methyl acrylate) etc. the glass fibre that processed.

(B2) using Japanese Laid-Open 2009-7179 publication sample No.1 described in overlay film forming agent (without acid) The glass fibre for being processed.

(polyvinyl resin)

Polyvinyl resin (is divided equally again using Asahi Chemical Corp manufacture Suntec (registration mark) LD L1850A Son amount 13.2 ten thousand, Tm=107 DEG C, density 918kg/m³)。

With regard to the measure of weight average molecular weight, using solution obtained from polyvinyl resin is dissolved in TCB at 140 DEG C, It is measured by GPC as follows.

Using TCB as mobile phase, sample solution concentration is 20mg～30mg (polyvinyl resin)/20ml (TCB).Column temperature is 140 DEG C, flow is 1.0ml/ minutes, using differential refractometer as detector, is measured.In the calculating of weight average molecular weight In, using PMMA as standard substance being calculated.

[embodiment 1～6]

The each composition of such mixture, is kneaded and is molded, obtained resin gears as shown in table 1.

Evaluation result is listed in table 1.

It is less than 0.9 percentage point that all embodiments are the differences of overstrain amount (%), and durability and quietness are good.

[comparative example 1～5]

Evaluation result is listed in table 1.

All comparative examples be the difference of overstrain amount (%) more than 0.9 percentage point, obtain durability and quietness be poor Result.

Industrial applicibility

The gear of the present invention is particularly has industry in the field of structural partsof automobiles of durability and quietness is required Practicality.

Claims

1. a kind of resin gears, which is the resin-made tooth of the teeth portion with gear ring portion and the peripheral part for being arranged at the gear ring portion Wheel,

Wherein, dependent variable c (%) and difference, i.e. overstrain d-c of dependent variable d (%) are less than 0.9 percentage point,

Dependent variable c (%) is for the gear ring portion or for the gear ring portion and the teeth portion carry out 1 75MPa The dependent variable of the gear after load and the unloading from 75MPa to 15MPa,

Dependent variable d (%) is the gear after the load of 50 75MPa and the unloading from 75MPa to 15MPa is repeated Dependent variable.

2. a kind of resin gears, which is the resin-made tooth of the teeth portion with gear ring portion and the peripheral part for being arranged at the gear ring portion Wheel,

Wherein, dependent variable b (%) and difference, i.e. elastic strain b-c of dependent variable c (%) are less than 2.5 percentage points,

Dependent variable b (%) is for the gear ring portion or for the gear ring portion and the teeth portion have carried out 1 75MPa Load when dependent variable,

Dependent variable c (%) carries out the dependent variable after 1 unloading from 75MPa to 15MPa for it afterwards.

3. a kind of resin gears, which is the resin-made tooth of the teeth portion with gear ring portion and the peripheral part for being arranged at the gear ring portion Wheel,

Wherein, value, the i.e. remnants obtained by the difference (d-a) by overstrain d-c divided by dependent variable d (%) with dependent variable a (%) Strain rate (d-c)/(d-a) is less than 0.50,

Overstrain d-c is the difference of dependent variable c (%) and dependent variable d (%), and dependent variable c (%) is for the tooth Circle portion or the tooth after the load of 1 75MPa and the unloading from 75MPa to 15MPa are carried out for the gear ring portion and the teeth portion The dependent variable of wheel, dependent variable d (%) be the load of 50 75MPa and the unloading from 75MPa to 15MPa is repeated after The dependent variable of gear,

In the difference (d-a) of dependent variable d (%) and dependent variable a (%), dependent variable d (%) is to be repeated 50 times Dependent variable after the load of 75MPa and the unloading from 75MPa to 15MPa, dependent variable a (%) for carried out 1 time until The dependent variable during load of 15MPa during load arrival 15MPa.

4. resin gears as any one of claims 1 to 3, which includes polyacetal resin.

5. resin gears as claimed in claim 4, wherein, relative to 100 mass parts of the polyacetal resin, comprising glass It is below 100 mass parts of more than 10 mass parts of packing material.

6. resin gears as claimed in claim 5, wherein, in the case where the resin gears are broken, from fracture It is less than more than 0.2 μm 3.0 μm comprising polyacetals tree that the surface of the glass system packing material that face projects is averaged thickness The composition of fat is covered.

7. resin gears as claimed in claim 5, wherein, as carrying out with the surface to glass system packing material The material of modified function is sour comprising at least a kind.

8. resin gears as claimed in claim 7, wherein, the acid is carboxylic acid.

9. resin gears as claimed in claim 4, wherein, the polyacetal resin includes block component.

10. resin gears as claimed in claim 9, wherein, the block component is the hydrogenation of two end Jing hydroxyalkylations Polybutadiene composition.

11. resin gears as claimed in claim 4, wherein, the content of the end OH bases in the polyacetal resin is relative In main chain oxidation MU 1mol be more than 0.006mol%.

12. resin gears as claimed in claim 4, wherein, relative to 100 mass parts of the polyacetal resin, further Below more than 0.5 mass parts of polyvinyl resin that weight average molecular weight is less than 500,000 8 mass parts.

13. resin gears as claimed in claim 12, wherein, the fusing point of the polyvinyl resin is less than 115 DEG C.

14. resin gears as claimed in claim 12, wherein, with the top layer away from resin gears rise 1,000 μm at enter The amount of the polyvinyl resin within the top layer 10nm in the face that the cutting of row deep layer is obtained is compared, the top layer of the resin gears The amount of the polyvinyl resin within 10nm is more.

A kind of 15. resin gears polyacetal resin composites, which is in the resin any one of claims 1 to 3 Polyacetal resin composite used in gear processed,

16. resin gears polyacetal resin composites as claimed in claim 15, wherein, relative to the polyacetals tree 100 mass parts of fat, further comprising more than 0.5 mass parts of polyvinyl resin that weight average molecular weight is less than 500,000 8 mass parts with Under.

17. resin gears polyacetal resin composites as claimed in claim 16, wherein, the polyvinyl resin it is molten Point is less than 115 DEG C.

18. resin gears polyacetal resin composites as claimed in claim 15, wherein, as with to the glass It is the material of the function of the modifying surface of packing material, it is sour comprising at least a kind.

19. resin gears polyacetal resin composites as claimed in claim 18, wherein, the acid is carboxylic acid.

20. resin gears polyacetal resin composites as claimed in claim 15, wherein, the polyacetal resin is included Block component.

21. resin gears polyacetal resin composites as claimed in claim 20, wherein, the block component is two last The hydrogenated butadiene polymer composition of end Jing hydroxyalkylations.

22. resin gears polyacetal resin composites as claimed in claim 15, wherein, in the polyacetal resin The content of end OH bases is more than 0.006mol% relative to the oxidation MU 1mol of main chain.

A kind of 23. manufacture methods of resin gears polyacetal resin composite, which is any one of claim 15～22 The manufacture method of described resin gears polyacetal resin composite, the manufacture method include following operations：

Using the material comprising at least a kind acid the function with the modifying surface to glass system packing material, to glass It is the operation of the modifying surface of packing material；With

The operation mixed by the glass system packing material being modified described in Jing and polyacetal resin.

A kind of 24. manufacture methods of resin gears, which is included to the resin-made tooth any one of claim 15～22 The operation is molded with polyacetal resin composite by wheel.