JP2015203477A - Gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear having a structure that can be made lightweight and can obtain wear resistance of a gear wheel part and a sufficient inertial force.SOLUTION: A gear 100 comprises a metallic rotating shaft part (such as a shaft 10), a metallic gear wheel part 20, and a resin connecting body 30 bonded to the rotating shaft part and the gear wheel part 20 respectively to connect the rotating shaft part and the gear wheel part 20 to each other. For example, the connecting body 30 covers both sides of a gear wheel body part 21 in the axial direction of the gear wheel body part 21 and is bonded to both sides respectively.

Description

  The present invention relates to a gear.

  A general gear is entirely made of a metal material. However, if the entire gear is made of metal, it is difficult to reduce the weight of the gear.

  In Patent Document 1, a metal wheel having a cylindrical hub in which a shaft hole is formed at the center of rotation, a plate-like rim fixed to the outer peripheral surface of the hub, and an outer periphery of the rim is fixed. A worm wheel comprising a synthetic resin gearing is described. The worm wheel is reduced in weight by the gear ring being made of synthetic resin.

JP 2000-329217 A

  In the technique of Patent Document 1, a part of the worm wheel is made of a synthetic resin, so that the weight can be reduced. However, since the gear ring is made of synthetic resin, it is difficult to ensure sufficient wear resistance of the gear ring. In addition, the hub and rim located on the rotation center side are made of metal (that is, high specific gravity), and the gear ring located on the side far from the rotation center is made of synthetic resin (that is, low specific gravity). It is also difficult to secure.

  The present invention has been made in view of the above problems, and provides a gear having a structure capable of obtaining not only weight reduction but also wear resistance of a gear portion and sufficient inertial force.

The present invention
A metal rotating shaft,
A metal gear,
A resin coupling body that is joined to the rotating shaft portion and the gear portion, respectively, and connects the rotating shaft portion and the gear portion to each other;
A gear having

  According to the present invention, not only the weight of the gear can be reduced, but also the wear resistance of the gear portion and the sufficient inertial force of the gear can be obtained.

It is a perspective view of the gear which concerns on 1st Embodiment. It is sectional drawing of the gear which concerns on 1st Embodiment. It is a schematic diagram for demonstrating the evaluation method of 1 million times bending fatigue resistance. It is a figure for demonstrating the metal resin composite which comprises a part of gear. It is a schematic diagram for demonstrating the example of the cross-sectional shape of the recessed part (micro recessed part) which comprises the roughening layer formed in the surface layer of the joint surface with the resin member in a metal member. It is a figure for demonstrating the method to manufacture the gear which concerns on 1st Embodiment. It is sectional drawing of the gear which concerns on 2nd Embodiment. It is a front view of the gear part of the gear concerning a 3rd embodiment. It is sectional drawing of the gear part of the gear which concerns on 4th Embodiment. It is sectional drawing of the gear which concerns on 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

[First Embodiment]
FIG. 1 is a perspective view of a gear 100 according to the first embodiment. FIG. 2 is a cross-sectional view of the gear 100 according to the first embodiment. The cross section shown in FIG. 2 is a cross section in which the gear 100 is cut along a plane along the axis X of the shaft (rotating shaft portion) 10.

  The gear 100 according to the present embodiment is joined to a metal rotation shaft portion (for example, the shaft 10), a metal gear portion 20, and the rotation shaft portion and the gear portion 20, respectively. Are connected to each other.

  Here, in this specification, the fact that the connecting body 30 is joined to the rotating shaft part and the gear part 20 means that, for example, the resin material constituting the connecting body 30 is the rotating shaft part and the gear part 20. This means that the resin material is molded so as to be integrated with the metal material constituting the. Thereby, the resin material which comprises the connection body 30 is physically joined with respect to the metal material which comprises the rotating shaft part and the gear part 20 by the anchor effect etc. However, the coupling body 30 may be bonded and fixed to the metal material constituting the rotating shaft portion and the gear portion 20.

  As shown in FIG.1 and FIG.2, the gear 100 has the shaft 10 as a rotating shaft part, for example. The shaft 10 is a rod-like body extending linearly in one direction.

  The gear portion 20 includes a gear main body portion 21 formed in an annular shape, and a plurality of teeth 22 provided on the gear main body portion 21 in an annular arrangement along the gear main body portion 21. .

  The gear body 21 is formed in an annular (donut-shaped) disk shape having a predetermined thickness. In the present embodiment, a plurality of teeth 22 are provided at regular intervals along the cylindrical outer peripheral surface 21 a of the gear body 21. The gear part 20 is produced by die casting or the like, and the gear body part 21 and the plurality of teeth 22 of the gear part 20 are integrally formed with each other.

  The shaft 10 passes through the gear main body 21 and is disposed along the axis of the gear main body 21. That is, the axis X of the shaft 10 and the axis of the gear main body 21 coincide with each other (that is, the axis X of the shaft 10 and the axis of the gear 20 coincide with each other).

  The coupling body 30 is filled at least between the outer peripheral surface 10a of the shaft 10 and the inner peripheral surface 21b of the gear main body 21 and is respectively provided on the outer peripheral surface 10a of the shaft 10 and the inner peripheral surface 21b of the gear main body 21. It is joined.

  In the case of this embodiment, the coupling body 30 covers both surfaces of the gear main body 21 in the axial direction of the gear main body 21 and is joined to both surfaces. That is, the coupling body 30 covers the one surface 21c and the other surface 21d of the gear main body 21 and is joined to the surfaces 21c and 21d, respectively. That is, the coupling body 30 sandwiches both surfaces of the gear main body 21.

  The shape of the coupling body 30 is not particularly limited. As an example, both surfaces (surfaces 30a and 30b) of the coupling body 30 in the axial direction of the shaft 10 are flat surfaces that are orthogonal to the axial center X of the shaft 10 and are parallel to each other. The front shape of the connecting body 30 (the shape when the connecting body 30 is viewed in the axial direction of the shaft 10) is, for example, an annular shape.

  Hereinafter, examples of preferable characteristics of the gear 100 according to the present embodiment will be described.

  Here, it can be considered that the gear 100 includes the metal member 12 (the shaft 10 or the gear portion 20) and the resin member 14 (the coupling body 30).

  FIG. 3 is a schematic diagram for explaining an evaluation method for resistance to bending fatigue of 1,000,000 times. FIG. 3 shows a test piece 16 used for evaluation of 1 million times bending fatigue resistance.

The test piece 16 is formed by laminating a plate-like resin member 14 having a thickness d1 and a plate-like metal member 12 having a thickness d2, and a thickness ratio d1 / d2 between the resin member 14 and the metal member 12 is 3. Thus, it is obtained by cutting out a part of the gear 100. Here, the resin member 14 of the test piece 16 is formed of a part of the coupling body 30, and the metal member 12 of the test piece 16 is formed of a part of the shaft 10 or the gear portion 20.
A first state where no stress is applied by placing the exposed surface of the resin member 14 on the two support bases 703 with the exposed surface of the resin member 14 being exposed to the test piece 16 at a temperature of 25 ° C., and the exposed surface of the resin member 14 Bending that does not peel or break when a one-point stress of 140 MPa is applied in the thickness direction to the second state where the center is submerged from the first state alternately 1 million times at a frequency of 30 Hz. It is preferable to have fatigue resistance (hereinafter referred to as “1 million times bending fatigue resistance”).
In other words, the gear 100 according to the present embodiment, the resin member 14 and the metal member 12 of thickness _{d 2} of the thickness _{d 1} are laminated, and the thickness of the resin member 14 and the metal member 12 ratio _d 1 / d The first state in which the stress is not applied by placing the exposed surface of the resin member 14 on the two support bases 703 on the two support bases 703 with respect to the test piece 16 cut out so that ₂ becomes 3. And a second state in which a single point stress of 140 MPa was applied to the center of the surface on the resin member 14 side in the thickness direction to sink the center from the first state was repeated 1,000,000 times alternately at a frequency of 30 Hz. Sometimes it is preferred to have bending fatigue resistance that does not peel or break.
By doing so, it is possible to make the gear 100 more excellent in reliability.

  The method for evaluating the 1,000,000 times bending fatigue resistance will be specifically described below.

First, a rectangular parallelepiped test piece 16 is prepared. The test piece 16 has one joint surface 103 between the metal member 12 and the resin member 14, and the thickness of the resin member 14 is three times the thickness of the metal member 12 (d ₁ / d ₂ = 3). To do. If d ₁ / d ₂ is 3, the thickness h, width b, and depth of the test piece 16 are not limited, but it is preferable that the test piece 16 conforms to JIS K 7171.

  Next, the prepared test piece 16 is installed across the two support bases 703 (first state). The distance between the two support bases 703 is adjusted so that the prepared test piece 16 can ride. The two support bases 703 are arranged symmetrically with respect to the test piece 16. At this time, the metal member 12 is positioned below the resin member 14, and the metal member 12 is disposed so as to contact the support base 703. Then, one indenter 701 is brought into contact with the upper surface of the resin member 14, and a one-way bending stress of 140 MPa is repeatedly applied in a direction perpendicular to the bonding surface 103. The contact position between the indenter 701 and the test piece 16 is a position equidistant from the contact position (fulcrum) between the two support bases 703 and the test piece 16. Repeated stress application is performed in an atmosphere at 25 ° C.

The magnitude σ [MPa] of the bending stress is represented by σ = 3FL / 2bh ² . Here, F [N] is the force applied from the indenter 701 (unit is N), L is the distance between fulcrums (unit is mm), b is the width of the test piece (unit is mm), and h is the thickness of the test piece. (Unit is mm). Depending on the width and thickness of the test piece and the distance between the fulcrums, the force F can be determined so that the magnitude of the bending stress is 140 MPa, and evaluation can be performed by applying repeated stress.

  Thus, by applying a stress of 140 MPa, the test piece 16 is slightly bent into a shape in which the center sinks (second state). Then, the stress application is stopped and the first state is restored to which no stress is applied. The first state and the second state are alternately repeated 1 million times at a frequency of 30 Hz. Thus, the test piece 16 after applying a stress of 1 million times is observed, and it is confirmed that the metal member 12 and the resin member 14 are not peeled off or the test piece 16 is not broken. When neither peeling nor breaking occurs, it is evaluated that it has 1 million times bending fatigue resistance.

  For example, the distance L between the fulcrums is 64 mm, the width of the test piece 16 is 80 mm, the depth is 10 mm, the thickness h is 4.0 mm (the thickness of the metal member 12 is 1.0 mm, the thickness of the resin member 14 is 3.0 mm), Although it can be confirmed that the bending stress magnitude σ is 140 MPa and it has a bending fatigue resistance of 1,000,000 times, it is not limited to this condition.

The gear 100 according to the present embodiment, the resin member 14 and the metal member 12 of thickness _{d 2} of the thickness _{d 1} are laminated, and the thickness of the resin member 14 and the metal member 12 ratio _d 1 / d _The test piece 16 cut out so that ₂ becomes 3 is first subjected to a baking treatment at 180 ° C. for 8 hours, and then 1000 cycles of heat treatment (after standing at −40 ° C. for 1 hour, 1 at 150 ° C. When the bending strength of the test piece 16 is measured according to JIS K6911, the bending strength is preferably 200 MPa or more. Such a gear 100 can be made highly reliable with excellent thermal durability capable of responding to changes in temperature conditions. Further, the bending strength of the test piece 16 measured under the above conditions is more preferably 250 MPa or more, and further preferably 300 MPa or more.

The gear 100 of the present embodiment is a metallic member 12 of the resin member 14 and the thickness d ₂ of the thickness d ₁ is laminated by stacking, and the ratio of the thickness of the resin member 14 and the metal member 12 d _The test piece 16 cut out so that ₁ / d ₂ was 3 was first subjected to a baking treatment at 180 ° C. for 8 hours, and then subjected to 1000 cycles of heat treatment (after standing at −40 ° C. for 1 hour, 150 When the bending elastic modulus of the test piece 16 is measured according to JIS K6911, the bending elastic modulus is preferably 20 GPa or more. Such a gear 100 can be made highly reliable with excellent thermal durability capable of responding to changes in temperature conditions in addition to various characteristics. Moreover, the bending elastic modulus of the test piece 16 measured under the above conditions is more preferably 22 GPa or more, and further preferably 24 MPa or more.

  Here, a structure obtained by cutting out a part of the gear 100 so as to include the joint surface 103 of the metal member 12 (the shaft 10 or the gear portion 20) and the resin member 14 (the coupling body 30) constituting the gear 100 is obtained. This is referred to as a metal resin composite.

In the metal-resin composite, the linear expansion coefficient α _R in the range from 25 ° C. to the glass transition temperature of the resin member 14 and the linear expansion coefficient α in the range from 25 ° C. of the metal member 12 to the glass transition temperature of the resin member 14. The absolute value of the difference from _M (α _R −α _M ) is preferably 25 ppm / ° C. or less, and more preferably 10 ppm / ° C. or less. If the difference in the linear expansion coefficient is not more than the above upper limit value, thermal stress due to the difference in linear expansion that occurs when the metal resin composite is exposed to high temperatures can be suppressed. Therefore, if the difference in the linear expansion coefficient is equal to or less than the upper limit value, the bonding strength between the resin member 14 and the metal member 12 can be maintained even at a high temperature. That is, if the difference in linear expansion coefficient is not more than the above upper limit value, the dimensional stability of the metal resin composite, and thus the gear 100 at a high temperature can be improved.
In the present embodiment, when the linear expansion coefficient has anisotropy, an average value thereof is represented. For example, when the resin member 14 has a sheet shape, when the linear expansion coefficient in the flow direction (MD) and the linear expansion coefficient in the vertical direction (TD) are different from each other, the average value thereof is the linear expansion coefficient α of the resin member 14. _R.

<Metal member 12>
FIG. 4 is a view for explaining a metal resin composite constituting a part of the gear 100 according to the present embodiment.
Although the metal material which comprises the metal member 12 is not specifically limited, From a viewpoint of availability or a price, iron, stainless steel, aluminum, an aluminum alloy, magnesium, a magnesium alloy, copper, a copper alloy, etc. can be mentioned. These may be used alone or in combination of two or more. Among these, aluminum, an aluminum alloy, or stainless steel is included because it is light and high in strength, and can provide the gear 100 with the features of the metal material itself, such as ensuring airtightness or ensuring rigidity. preferable. In addition, the metal material which comprises the shaft 10 and the metal material which comprises the gear part 20 may be the same kind, and may differ.

  From the viewpoint of improving the bonding strength between the resin member 14 and the metal member 12, it is preferable that a roughened layer 104 made of minute irregularities is formed on the bonding surface of the metal member 12 with the resin member 14.

FIG. 5 is a schematic diagram for explaining an example of a cross-sectional shape of a concave portion (micro concave portion) 201 constituting the roughened layer 104 formed on the surface layer of the metal member 12 where the resin member 14 is bonded. Here, the roughened layer 104 refers to a region having a plurality of recesses 201 provided on the surface of the metal member 12.
The thickness of the roughened layer 104 is preferably 3 μm or more and 40 μm or less, more preferably 4 μm or more and 32 μm or less, and particularly preferably 4 μm or more and 30 μm or less. When the thickness of the roughened layer 104 is within the above range, the bonding strength between the resin member 14 and the metal member 12 and the durability of the bonding can be further improved. Here, in this embodiment, the thickness of the roughening layer 104 is represented by the depth D3 of the largest depth among the plurality of recesses 201, and can be calculated from a scanning electron microscope (SEM) photograph. .

It is preferable that the cross section of the recess 201 has a shape having a cross section width D2 larger than the cross section width D1 of the opening 203 in at least a part between the opening 203 and the bottom 205 of the recess 201.
As shown in FIG. 5, the cross-sectional shape of the recess 201 is not particularly limited as long as D2 is larger than D1, and can take various shapes. The cross-sectional shape of the recess 201 can be observed with, for example, a scanning electron microscope (SEM).

If the cross-sectional shape of the recess 201 is the above shape, the reason why a metal-resin composite having even better joint strength can be obtained is not clear, but the surface of the joint surface 103 is formed between the resin member 14 and the metal member 12. This is thought to be due to the structure in which the anchor effect between them can be expressed more strongly.
When the cross-sectional shape of the concave portion 201 is the above shape, the resin member 14 is caught between the opening 203 and the bottom portion 205 of the concave portion 201, so that the anchor effect is effective. Therefore, it is considered that the bonding strength and bonding durability between the resin member 14 and the metal member 12 are improved.

  The average depth of the recess 201 is preferably 0.5 μm or more and 40 μm or less, and more preferably 1 μm or more and 30 μm or less. Since the resin material (thermosetting resin composition (P)) which comprises a connection body can fully penetrate into the back of the recessed part 201 as the average depth of the recessed part 201 is below the said upper limit, the resin member 14 It is possible to further improve the mechanical strength and the durability of bonding in the region where the metal member 12 and the metal member 12 have entered each other. When the average depth of the recesses 201 is equal to or greater than the above lower limit, the proportion of the filler (B) present inside the recesses 201 is increased when the thermosetting resin composition (P) contains the filler (B). Therefore, it is possible to improve the mechanical strength and the durability of joining in the region where the resin member 14 and the metal member 12 penetrate each other. Therefore, when the average depth of the recess 201 is within the above range, the bonding strength between the resin member 14 and the metal member 12 and the durability of the bonding can be further improved.

  The average depth of the recess 201 can be measured from a scanning electron microscope (SEM) photograph as follows, for example. First, a cross section of the roughened layer 104 is photographed with a scanning electron microscope. From the observation image, 50 concave portions 201 are arbitrarily selected and their depths are measured. The average depth is obtained by integrating all the depths of the recesses 201 and dividing the sum by the number.

The surface roughness Ra of the bonding surface 103 of the metal member 12 is preferably 0.5 μm or more and 40.0 μm or less, more preferably 1.0 μm or more and 20.0 μm or less, and particularly preferably 1.0 μm or more and 10. 0 μm or less. When the surface roughness Ra is within the above range, the bonding strength between the resin member 14 and the metal member 12 can be further improved.
The maximum height Rz of the joint surface 103 of the metal member 12 is preferably 1.0 μm or more and 40.0 μm or less, and more preferably 3.0 μm or more and 30.0 μm or less. When the maximum height Rz is within the above range, the bonding strength between the resin member 14 and the metal member 12 and the durability of the bonding can be further improved. The surface roughness Ra and the maximum height Rz can be measured according to JIS-B0601.

  In the metal member 12, the ratio of the actual surface area by the nitrogen adsorption BET method to the apparent surface area of the joint surface 103 to be joined to at least the resin member 14 (hereinafter also simply referred to as specific surface area) is preferably 100 or more, more preferably. 150 or more. When the specific surface area is equal to or greater than the lower limit, the bonding strength and bonding durability between the resin member 14 and the metal member 12 can be further improved. The specific surface area is preferably 400 or less, more preferably 380 or less, and particularly preferably 300 or less. When the specific surface area is not more than the upper limit, the bonding strength and bonding durability between the resin member 14 and the metal member 12 can be further improved.

  Here, the apparent surface area in the present embodiment means a surface area when it is assumed that the surface of the metal member 12 is smooth without unevenness. For example, when the surface shape is a rectangle, it is represented by vertical length × horizontal length. On the other hand, the actual surface area by the nitrogen adsorption BET method in the present embodiment means the BET surface area obtained from the adsorption amount of nitrogen gas. For example, using a specific surface area / pore distribution measuring device (BELSORPmini II, manufactured by Nippon Bell Co., Ltd.) for a vacuum dried sample to be measured, the nitrogen adsorption / desorption amount at liquid nitrogen temperature is measured, and based on the nitrogen adsorption / desorption amount Can be calculated.

When the specific surface area is within the above range, the reason why a metal-resin composite excellent in bonding strength and bonding durability can be obtained is not clear, but the surface of the bonding surface 103 with the resin member 14 is This is probably because the anchor effect between the resin member 14 and the metal member 12 can be expressed more strongly.
When the specific surface area is equal to or greater than the lower limit, the contact area between the resin member 14 and the metal member 12 is increased, and the region where the resin member 14 and the metal member 12 enter each other increases. As a result, the region where the anchor effect works increases, and it is considered that the bonding strength and bonding durability between the resin member 14 and the metal member 12 are further improved.

On the other hand, if the specific surface area is too large, the ratio of the metal member 12 in the region where the resin member 14 and the metal member 12 penetrated each other decreases, so that the mechanical strength and bonding durability of this region decrease. . Therefore, when the specific surface area is equal to or less than the upper limit value, the mechanical strength and the durability of bonding of the region where the resin member 14 and the metal member 12 have invaded each other are further improved. It is considered that the bonding strength with the metal member 12 and the durability of the bonding can be further improved.
From the above, when the specific surface area is within the above range, the surface of the joint surface 103 with the resin member 14 can exhibit the anchor effect between the resin member 14 and the metal member 12 more strongly and has a well-balanced structure. It is inferred that

The metal member 12 is not particularly limited, but at least the glossiness of the bonding surface 103 bonded to the resin member 14 is preferably 0.1 or more, more preferably 0.5 or more, and further preferably 1 or more. is there. When the glossiness is not less than the lower limit, the bonding strength between the resin member 14 and the metal member 12 can be further improved. Further, the glossiness is preferably 30 or less, more preferably 20 or less. When the glossiness is not more than the above upper limit value, the bonding strength between the resin member 14 and the metal member 12 can be further improved. Here, the glossiness in the present embodiment indicates a value at a measurement angle of 60 ° (incident angle of 60 °, reflection angle of 60 °) measured in accordance with ASTM-D523. The glossiness can be measured using, for example, a digital glossiness meter (20 °, 60 °) (GM-26 type, manufactured by Murakami Color Research Laboratory Co., Ltd.).
If the gloss is within the above range, the reason why a metal resin composite that is more excellent in bonding strength is not necessarily clear, but the surface of the bonding surface 103 with the resin member 14 has a more messy structure, This is probably because the anchor effect between the resin member 14 and the metal member 12 can be expressed more strongly.

The shape of the metal member 12 is not particularly limited as long as the shape has the joint surface 103 that joins the resin member 14. The metal member 12 can be obtained by processing the above-described metal material by a known processing method.
Further, the shape of the joint surface 103 to be joined to the resin member 14 may be a curved surface, a flat surface, or a shape combining a curved surface and a flat surface.

Next, a method for forming the roughened layer 104 by roughening the surface of the metal member 12 will be described.
The roughened layer 104 can be formed, for example, by chemically treating the surface of the metal member 12 using a surface treatment agent.
Here, the chemical treatment of the surface of the metal member 12 using the surface treatment agent itself has been performed in the prior art. However, in this embodiment, factors such as (1) combination of metal member and chemical treatment agent, (2) temperature and time of chemical treatment, and (3) post-treatment of the surface of the metal member after chemical treatment are included. Highly controlled. In order to obtain a metal resin composite having 1 million times bending fatigue resistance, it is particularly important to control these factors to a high degree.
Hereinafter, an example of a method for forming the roughened layer 104 on the surface of the metal member 12 will be described. However, the method for forming the roughened layer 104 according to the present embodiment is not limited to the following example.

First, (1) a combination of a metal member and a surface treatment agent is selected.
When using the metal member 12 composed of iron or stainless steel, it is preferable to select an aqueous solution in which an inorganic acid, a chlorine ion source, a cupric ion source, and a thiol compound are combined as necessary as a surface treatment agent. .
When the metal member 12 made of aluminum or an aluminum alloy is used, it is preferable to select an aqueous solution in which an alkali source, an amphoteric metal ion source, a nitrate ion source, and a thio compound are combined as necessary as a surface treatment agent.
When the metal member 12 made of magnesium or magnesium alloy is used, an alkali source is used as the surface treatment agent, and it is particularly preferable to select an aqueous solution of sodium hydroxide.
In the case of using a metal member 12 composed of copper or a copper alloy, as a surface treating agent, inorganic acids such as nitric acid and sulfuric acid, organic acids such as unsaturated carboxylic acids, persulfates, hydrogen peroxide, imidazole and derivatives thereof Tetrazoles and derivatives thereof, aminotetrazoles and derivatives thereof, azoles such as aminotriazole and derivatives thereof, pyridine derivatives, triazines, triazine derivatives, alkanolamines, alkylamine derivatives, polyalkylene glycols, sugar alcohols, cupric ion sources, It is preferable to select an aqueous solution using at least one selected from a chloride ion source, a phosphonic acid chelating agent, an oxidizing agent, and N, N-bis (2-hydroxyethyl) -N-cyclohexylamine.

Next, (2) the metal member 12 is immersed in a surface treatment agent, and the surface of the metal member 12 is chemically treated. At this time, the processing temperature is, for example, 30 ° C. The treatment time is appropriately determined depending on the material and surface state of the metal member 12 to be selected, the type and concentration of the surface treatment agent, the treatment temperature, and the like, and is, for example, 30 to 300 seconds. At this time, it is important that the etching amount in the depth direction of the metal member 12 is preferably 3 μm or more, more preferably 5 μm or more. The etching amount in the depth direction of the metal member 12 can be evaluated by calculating from the weight, specific gravity and surface area of the dissolved metal member 12. The etching amount in the depth direction can be adjusted by the type and concentration of the surface treatment agent, the treatment temperature, the treatment time, and the like.
In the present embodiment, by adjusting the etching amount in the depth direction, the thickness of the roughened layer 104, the average depth of the recesses 201, Ra, Rz, and the like described above can be adjusted.

Finally, (3) post-treatment is performed on the surface of the metal member 12 after chemical treatment. First, the surface of the metal member 12 is washed with water and dried. Next, the surface of the metal member 12 subjected to chemical treatment is treated with an aqueous nitric acid solution or the like.
With the above procedure, the metal member 12 having the roughened layer 104 according to the present embodiment can be obtained.

<Resin member 14>
Next, the resin member 14 according to the present embodiment will be described.
The resin member 14 is formed by curing the thermosetting resin composition (P).

The thermosetting resin composition (P) includes a thermosetting resin (A), and examples of the thermosetting resin (A) include a phenol resin, an epoxy resin, an unsaturated polyester resin, a diallyl phthalate resin, and a melamine resin. Oxetane resin, maleimide resin, urea (urea) resin, polyurethane resin, silicone resin, resin having a benzoxazine ring, cyanate ester resin, and the like are used. These may be used alone or in combination of two or more.
Among these, from the point that the features of the resin material itself such as heat resistance, workability, mechanical properties, adhesiveness and rust prevention can be brought to the gear 100, from phenol resin, epoxy resin and unsaturated polyester resin The thermosetting resin composition (P) containing 1 or more selected from the group which consists of is used suitably.
The content of the thermosetting resin (A) is preferably 15 parts by mass or more and 60 parts by mass or less, more preferably 25 parts by mass or more and 50 parts by mass or less, when the entire resin member 14 is 100 parts by mass. is there.

Examples of the phenolic resin include novolak-type phenolic resins such as phenol novolak resin, cresol novolak resin, and bisphenol A type novolak resin; Examples thereof include resol type phenol resins such as oil-melted resol phenol resin; aryl alkylene type phenol resins and the like. These may be used alone or in combination of two or more.
Among these, a novolak type phenol resin is preferable because it is easily available, inexpensive, and has good workability by roll kneading.

  In the above phenol resin, when a novolac type phenol resin is used, hexamethylenetetramine is usually used as a curing agent. Although hexamethylenetetramine is not particularly limited, it is preferably used in an amount of 10 to 25 parts by mass and more preferably 13 to 20 parts by mass with respect to 100 parts by mass of the novolac type phenol resin. When the amount of hexamethylenetetramine used is not less than the above lower limit, the curing time during molding can be shortened. Moreover, the external appearance of a molded article can be improved as the usage-amount of hexamethylenetetramine is below the said upper limit.

The thermosetting resin composition (P) includes the filler (B) from the viewpoint of improving the mechanical strength of the resin member 14. However, in this embodiment, the elastomer (D) described later is excluded from the filler (B).
The content of the filler (B) is preferably 30 parts by mass or more and 80 parts by mass or less, and more preferably 40 parts by mass or more and 70 parts by mass or less when the entire resin member 14 is 100 parts by mass. By making the content of the filler (B) within the above range, it is possible to further improve the mechanical strength of the resulting resin member 14 while improving the workability of the thermosetting resin composition (P). it can. Thereby, the metal resin composite further excellent in the joint strength of the resin member 14 and the metal member 12 can be obtained. Moreover, the value of linear expansion coefficient (alpha) R of the resin member 14 obtained can be adjusted by adjusting the kind and content of a filler (B).

  Examples of the filler (B) include a fibrous filler, a granular filler, and a plate-like filler. Here, the fibrous filler is a filler whose shape is fibrous. The plate-like filler is a filler whose shape is plate-like. The granular filler is a filler having a shape other than a fiber or plate including an indefinite shape.

  Examples of the fibrous filler include glass fiber, carbon fiber, asbestos fiber, metal fiber, wollastonite, attapulgite, sepiolite, rock wool, aluminum borate whisker, potassium titanate fiber, calcium carbonate whisker, and titanium oxide whisker. And fibrous inorganic fillers such as ceramic fibers; aramid fibers, polyimide fibers, and poly (fibrous organic fillers such as paraphenylene benzobisoxazole fibers). These may be used alone or in two kinds. You may use it in combination.

  Examples of the plate-like filler and granular filler include talc, kaolin clay, calcium carbonate, zinc oxide, calcium silicate hydrate, mica, glass flakes, glass powder, magnesium carbonate, silica, titanium oxide, Alumina, aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium sulfate, calcium sulfite, zinc borate, barium metaborate, aluminum borate, calcium borate, sodium borate, aluminum nitride, boron nitride, silicon nitride, the above fibers For example, a pulverized product of a filler. These may be used alone or in combination of two or more.

When the filler (B) is 100 parts by mass as a whole, the filler (B) is a filler (B1) having an average particle diameter of more than 5 μm in the weight-based particle size distribution measured by the laser diffraction scattering particle size distribution measurement method. It is preferably contained in an amount of not less than 99 parts by mass and more preferably not less than 85 parts by mass and not more than 98 parts by mass. Thereby, the mechanical strength of the resin member 14 obtained can be further improved while improving the workability of the thermosetting resin composition (P). Although the upper limit of the average particle diameter of a filler (B1) is not specifically limited, For example, it is 100 micrometers or less.
More preferably, the filler (B1) includes a fibrous filler or a plate-like filler having an average major axis of 5 μm to 50 mm and an average aspect ratio of 1 to 1000.
The average major axis and average aspect ratio of the filler (B1) can be measured from an SEM photograph as follows, for example. First, a plurality of fibrous fillers or plate-like fillers are photographed with a scanning electron microscope. From the observation image, 50 fibrous fillers or plate-like fillers are arbitrarily selected, and their major diameters (fiber length in the case of fibrous fillers, planar major dimension in the case of plate-like fillers) and The short diameter (in the case of a fibrous filler, the fiber diameter, in the case of a plate-like filler, the dimension in the thickness direction) is measured. The average major axis is obtained by integrating all major axes and dividing by the number. Similarly, the average minor axis is obtained by integrating all minor axes and dividing by the number. The average major axis with respect to the average minor axis is defined as the average aspect ratio.

  The filler (B1) is preferably one or more selected from glass fibers, carbon fibers, glass beads, calcium carbonate, and the like. When such a filler (B1) is used, the mechanical strength of the resin member 14 can be particularly improved.

The filler (B) has an average particle size of 0.1 μm or more and 5 μm or less in a weight-based particle size distribution measured by a laser diffraction / scattering particle size distribution measurement method when the entire filler (B) is 100 parts by mass. The filler (B2) is preferably contained in an amount of 1 part by mass or more and 30 parts by mass or less, and more preferably 2 parts by mass or more and 15 parts by mass or less. Thereby, the filler (B) can be sufficiently present inside the recess 201. As a result, the mechanical strength of the region where the resin member 14 and the metal member 12 have entered each other can be further improved.
As the filler (B2), the average major axis is preferably 0.1 μm or more and 100 μm or less, more preferably 0.2 μm or more and 50 μm or less, and the average aspect ratio is preferably 1 or more and 50 or less, more preferably 1 or more and 40 or less. It is more preferable to include a fibrous filler or a plate-like filler.
The average major axis and average aspect ratio of the filler (B2) can be measured from an SEM photograph as follows, for example. First, a plurality of fibrous fillers or plate-like fillers are photographed with a scanning electron microscope. From the observation image, 50 fibrous fillers or plate-like fillers are arbitrarily selected, and their major diameters (fiber length in the case of fibrous fillers, planar major dimension in the case of plate-like fillers) and The short diameter (in the case of a fibrous filler, the fiber diameter, in the case of a plate-like filler, the dimension in the thickness direction) is measured. The average major axis is obtained by integrating all major axes and dividing by the number. Similarly, the average minor axis is obtained by integrating all minor axes and dividing by the number. The average major axis with respect to the average minor axis is defined as the average aspect ratio.

  As such a filler (B2), one type selected from wollastonite, kaolin clay, talc, calcium carbonate, zinc oxide, calcium silicate hydrate, aluminum borate whisker, and potassium titanate fiber or Two or more are preferred.

  Moreover, it is preferable that a thermosetting resin composition (P) contains a solid lubricant as a filler (B). As the solid lubricant, for example, one or more selected from graphite, carbon fiber, and fluororesin are preferable. By including the solid lubricant, the friction coefficient of the resin member 14 is lowered.

  Further, the filler (B) may be subjected to a surface treatment with a coupling agent such as a silane coupling agent (C) described later.

  The thermosetting resin composition (P) may further contain a silane coupling agent (C). By including the silane coupling agent (C), the adhesion between the resin member 14 and the metal member 12 can be improved. Further, by including the silane coupling agent (C), the affinity between the thermosetting resin (A) and the filler (B) is improved, and as a result, the mechanical strength of the resin member 14 is further improved. be able to.

  The content of the silane coupling agent (C) is not particularly limited because it depends on the specific surface area of the filler (B), but is preferably 0.01 parts by mass or more and 4 parts by mass with respect to 100 parts by mass of the filler (B). 0.0 part by mass or less, and more preferably 0.1 part by mass or more and 1.0 part by mass or less. When the content of the silane coupling agent (C) is within the above range, the mechanical strength of the resin member 14 can be further improved while sufficiently covering the filler (B).

Examples of the silane coupling agent (C) include epoxy groups such as γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane. -Containing alkoxysilane compounds; mercapto group-containing alkoxysilane compounds such as γ-mercaptopropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane; γ-ureidopropyltriethoxysilane, γ-ureidopropyltrimethoxysilane, γ- (2- Ureido group-containing alkoxysilane compounds such as ureidoethyl) aminopropyltrimethoxysilane; γ-isocyanatopropyltriethoxysilane, γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldimethoxy Isocyanato group-containing alkoxysilane compounds such as silane, γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylethyldimethoxysilane, γ-isocyanatopropylethyldiethoxysilane, γ-isocyanatopropyltrichlorosilane; γ-amino Amino group-containing alkoxysilane compounds such as propyltriethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane; Examples thereof include hydroxyl group-containing alkoxysilane compounds such as -hydroxypropyltrimethoxysilane and γ-hydroxypropyltriethoxysilane.
These may be used alone or in combination of two or more.

From the viewpoint of improving the toughness of the resin member 14, the thermosetting resin composition (P) according to the present embodiment may further include an elastomer (D). However, in this embodiment, the filler (B) described above is excluded from the elastomer (D).
The content of the elastomer (D) is preferably 1 part by mass or more and 10 parts by mass or less, and more preferably 1.5 parts by mass or more and 7 parts by mass or less when the entire resin member 14 is 100 parts by mass. . By setting the content of the elastomer (D) within the above range, the toughness of the resin member 14 can be further improved while maintaining the mechanical strength of the resin member 14. Thereby, the metal resin composite further excellent in the joint strength of the resin member 14 and the metal member 12 can be obtained.

  Examples of the elastomer (D) include unmodified polyvinyl acetate, carboxylic acid-modified polyvinyl acetate, polyvinyl butyral, natural rubber, isoprene rubber, styrene / butadiene rubber, butadiene rubber, chloroprene rubber, butyl rubber, and ethylene / propylene rubber. Acrylic rubber, styrene / isoprene rubber, acrylonitrile / budadiene rubber, urethane rubber, silicon rubber, fluorine rubber and the like. These may be used alone or in combination of two or more. Among these, unmodified polyvinyl acetate, carboxylic acid-modified polyvinyl acetate, acrylic rubber, acrylonitrile / budadiene rubber, and polyvinyl butyral are preferable. When these elastomers are used, the toughness of the resin member 14 can be particularly improved.

  The manufacturing method of a thermosetting resin composition (P) is not specifically limited, Generally, it can manufacture by a well-known method. For example, the following method is mentioned. First, the thermosetting resin (A), if necessary, a filler (B), a silane coupling agent (C), an elastomer (D), a curing agent, a curing aid, a release agent, a pigment, a flame retardant, A weathering agent, an antioxidant, a plasticizer, a lubricant, a sliding agent, a foaming agent, and the like are blended and mixed uniformly. Next, the obtained mixture is heated and melt-kneaded by a kneading apparatus such as a roll, a kneader, a twin-screw extruder alone, or a combination of a roll and another kneading apparatus. Finally, the thermosetting resin composition (P) is obtained by granulating or pulverizing the obtained mixture.

  The linear expansion coefficient αR in the range from 25 ° C. to the glass transition temperature of the resin member 14 is preferably 10 ppm / ° C. or more and 50 ppm / ° C. or less, more preferably 15 ppm / ° C. or more and 45 ppm / ° C. or less. When the linear expansion coefficient αR is within the above range, the reliability of the temperature cycle of the metal resin composite can be further improved.

The density of the resin member 14 is preferably 2.5 g / cm ³ or less, and more preferably 2.0 g / cm ³ or less, from the viewpoint of weight reduction.

  The thermal conductivity of the resin member 14 is preferably 90 W / (m · K) or less, and more preferably 1 W / (m · K) or less. If it is below the upper limit, the heat insulation from the shaft 10 of the gear 100 to the gear portion 20 and the heat insulation from the gear portion 20 of the gear 100 to the shaft 10 are improved. The thermal conductivity can be measured by a laser flash method. When the thermal conductivity is anisotropic, the thermal conductivity of the resin member 14 means the thermal conductivity in the direction perpendicular to the joint surface 103 between the metal member 12 and the resin member 14.

  When the thermosetting resin composition (P) containing the filler (B) is used, the filler (B) is present inside the recess 201, and the scanning electron microscope of the filler (B) present in the recess 201 is used. The average major axis by image analysis of photographs is preferably 0.1 μm or more and 5.0 μm or less, and more preferably 0.2 μm or more and 4 μm or less. Thereby, the mechanical strength of the area | region where the resin member 14 and the metal member 12 penetrate | invaded mutually can be improved further.

  Moreover, the average aspect ratio of the filler (B) existing inside the recess 201 is preferably 1 or more and 50 or less, and more preferably 1 or more and 40 or less.

  The average major axis and average aspect ratio of the filler (B) present inside the recess 201 can be measured from the SEM photograph as follows. First, a cross section of the roughened layer 104 is photographed with a scanning electron microscope. From the observation image, 50 fillers (B) existing inside the recess 201 are arbitrarily selected, and their major diameters (fiber length in the case of fibrous fillers, and major axis in the planar direction in the case of plate-like fillers). Dimension) and a short diameter (in the case of a fibrous filler, the fiber diameter, in the case of a plate-like filler, the dimension in the thickness direction) are measured. The average major axis is obtained by integrating all major axes and dividing by the number. Similarly, the average minor axis is obtained by integrating all minor axes and dividing by the number. The average major axis with respect to the average minor axis is defined as the average aspect ratio.

  The filler (B) present in the recess 201 is a group consisting of wollastonite, kaolin clay, talc, calcium carbonate, zinc oxide, calcium silicate hydrate, aluminum borate whisker, and potassium titanate fiber. It is preferable that it is 1 type, or 2 or more types chosen from.

Moreover, when the resin member 14 contains an elastomer (D), the resin member 14 preferably has a sea-island structure, and the elastomer (D) is preferably present in the island phase.
With such a structure, the toughness of the resin member 14 can be improved and the impact resistance of the metal resin composite can be improved. Therefore, even if an impact is applied to the metal resin composite from the outside, the bonding strength between the resin member 14 and the metal member 12 can be maintained.
The sea-island structure can be observed by scanning electron micrographs.

The average diameter by image analysis of the scanning electron micrograph of the island phase is preferably 0.1 μm or more and 100 μm or less, and more preferably 0.2 μm or more and 30 μm or less. When the average diameter of the island phase is within the above range, the toughness of the resin member 14 can be further improved and the impact resistance of the metal resin composite can be further improved.
The average diameter of the island phase can be measured from a scanning electron microscope (SEM) photograph as follows. First, a cross section of the resin member 14 is photographed with a scanning electron microscope. From the observation image, 50 island phases existing in the resin member 14 are arbitrarily selected and their diameters are measured. The average diameter is the sum of the island phase diameters divided by the number.

<Gear manufacturing method>
Next, an example of a method for manufacturing the gear 100 according to the present embodiment will be described. The manufacturing method of the gear 100 is not particularly limited as long as the metal resin composite can be molded so that the resin member 14 and the metal member 12 are bonded to each other. Examples of a method capable of forming such a metal resin composite include an injection molding method, a transfer molding method, a compression molding method, and an injection compression molding method.

  FIGS. 6A and 6B are diagrams for explaining a method of manufacturing the gear 100 according to the first embodiment, in which (a) shows a first example and (b) shows a second example.

As shown in FIG. 6 (a), in the first example of the method for manufacturing the gear 100, the resin material constituting the coupling body 30 is used in a state where the shaft 10 and the gear portion 20 are positioned in the mold 200, respectively. The gear 100 is manufactured by molding by injection molding.
This will be specifically described below.

  As shown in FIG. 6A, the mold 200 includes a first portion 210, a second portion 220, and a third portion 230 each formed in a disk shape. For example, the mold 200 is configured by stacking the first portion 210, the second portion 220, and the third portion 230 in this order from below.

  A recess 231 that opens upward is formed on the upper surface of the third portion 230. The concave portion 231 contains a gear positioning concave portion 231a that accommodates and positions the gear portion 20, a shaft positioning concave portion 231b that accommodates and positions one end portion of the shaft 10, and a cavity into which a resin material constituting the coupling body 30 is injected. And a cavity constituting recess 231c constituting a part.

  A recess 221 that opens downward is formed on the lower surface of the second portion 220. The concave portion 221 includes a shaft positioning concave portion 221b that accommodates and positions the other end portion of the shaft 10, and a cavity constituting concave portion 221c that constitutes another part of the cavity.

  The second portion 220 is further formed with a resin flow path 222 that communicates from the upper surface side of the second portion 220 to the cavity forming recess 221c.

  The first portion 210 is formed with a resin flow channel 211 that penetrates from the upper surface side to the lower surface side of the first portion 210 and communicates with the resin flow channel 222 of the second portion 220 in a state where the mold 200 is assembled. Yes.

  To manufacture the gear 100, first, the gear portion 20 is accommodated and positioned in the gear positioning recess 231a from the upper surface side of the third portion 230 with the upper surface side of the third portion 230 opened. Further, one end portion of the shaft 10 is inserted into the shaft positioning concave portion 231b from the upper surface side of the third portion 230 and positioned.

  Next, the second portion 220 and the first portion 210 are disposed on the third portion 230, and the mold 200 is assembled by assembling the third portion 230, the second portion 220, and the first portion 210 to each other. . As a result, the other end of the shaft 10 is inserted into the shaft positioning recess 221b and positioned. Further, the lower surface of the second portion 220 is in contact with the upper surface of the gear portion 20. In this state, the resin flow path 222 of the second portion 220 and the resin flow path 211 of the first portion 210 are in communication with each other (see FIG. 6A). In this state, the cavity constituting recess 221c, the cavity constituting recess 231c, and the inner cavity region of the gear portion 20 form a cavity in which the resin material constituting the coupling body 30 is injected to mold the resin material. ing.

  Next, molten resin is injected into the cavity from the injection machine (not shown) through the resin flow path 211 and the resin flow path 222. Next, by solidifying the resin injected into the cavity, the connecting body 30 is formed, and the shaft 10 and the gear portion 20 are integrated with each other via the connecting body 30 to produce the gear 100. Is done.

  Next, the mold 200 is divided into two parts with the boundary between the third part 230 and the second part 220 as a parting line, and the gear 100 is taken out from the mold 200. Thus, the gear 100 can be obtained.

  In FIG. 6A, the pin gate method is illustrated as an example of the injection molding, but the gear 100 can be manufactured by other types of injection molding such as a side gate method, a disk gate method, a submarine gate method, and the like. it can.

As shown in FIG. 6B, in the second example of the method for manufacturing the gear 100, the resin material constituting the coupling body 30 is used with the shaft 10 and the gear portion 20 positioned in the mold 300. The gear 100 is manufactured by molding by compression molding.
This will be specifically described below.

  As shown in FIG. 6B, the mold 300 includes a first portion 310, a second portion 320, a third portion 330, and a plunger portion 340.

  The third portion 330 is formed in a disk shape. A concave portion 331 that opens upward is formed on the upper surface of the third portion 330. The concave portion 331 accommodates and positions the gear portion 20, a gear positioning concave portion 331 a, a shaft positioning concave portion 331 b that accommodates and positions one end of the shaft 10, and a cavity into which the resin material constituting the coupling body 30 is injected. A cavity constituting recess 331c constituting a part. That is, the third portion 330 of the mold 300 is configured in the same manner as the third portion 230 of the mold 200.

  The second portion 320 is formed in a disk shape. The second portion 320 is formed with a cylindrical through-hole 321 that penetrates the second portion 320 up and down. The lower end portion of the through hole 321 constitutes another part of the cavity.

  The first portion 310 includes a disk-shaped main body portion 311 and a cylindrical protrusion portion 312 that protrudes downward from the main body portion 311. The outer diameter of the protruding portion 312 is equal to the inner diameter of the through hole 321 of the second portion 320 or slightly smaller than the inner diameter of the through hole 321, and the protruding portion 312 can be fitted into the through hole 321. It has become. The first portion 310 is formed with a cylindrical through hole 313 that penetrates from the upper surface side of the main body 311 to the lower surface side of the protruding portion 312. The inner diameter of the through hole 313 is equal to the outer diameter of the shaft 10 or slightly larger than the outer diameter of the shaft 10, and the end of the shaft 10 can be fitted into the through hole 313. .

  Plunger portion 340 has a cylindrical shape with an outer diameter equivalent to that of shaft 10. The plunger portion 340 is fitted into the through hole 313 and is slidable in the axial direction of the through hole 313.

  To manufacture the gear 100, first, the gear portion 20 is accommodated and positioned in the gear positioning recess 331a from the upper surface side of the third portion 330 with the upper surface side of the third portion 330 opened. Further, one end portion of the shaft 10 is inserted into the shaft positioning recess 331b from the upper surface side of the third portion 330 and positioned.

  Next, the second portion 320 is disposed on the third portion 330, and the third portion 330 and the second portion 320 are connected to each other. In this state, the lower surface of the second portion 320 is in contact with the upper surface of the gear unit 20. In this state, the cavity forming recess 331 c, the lumen region of the gear portion 20, and the lower end portion of the through-hole 321 constitute a cavity for molding the resin material constituting the coupling body 30.

  Next, a resin material is put into the cavity through the through hole 321 of the second portion 320. The amount of the resin material is set so as not to be excessive or insufficient for forming the connection body 30. For this reason, the resin material is raised above the cavity at this stage.

  Next, the plunger portion 340 is assembled to the first portion 310 by fitting the plunger portion 340 into the through hole 313.

  Next, the protruding portion 312 of the first portion 310 is fitted into the through hole 321 of the second portion 320 from above. Here, before compressing the resin material by the protruding portion 312, first, the plunger portion 340 is pushed down relative to the first portion 310, and the shaft 10 is pressed downward by the plunger portion 340. Thereby, the lifting of the shaft 10 during molding is suppressed.

  Next, the first portion 310 is pushed down. At this time, the first portion 310 moves downward relative to the plunger portion 340. Further, the upper end portion of the shaft 10 is fitted into the lower end portion of the through hole 313 in the process of pushing down the first portion 310. The first portion 310 is moved downward until the lower surface of the main body portion 311 contacts the upper surface of the second portion 320. Thereby, the resin material is compressed by the lower surface of the protrusion 312 and the resin material is molded in the cavity. Next, by solidifying the resin material in the cavity, the coupling body 30 is formed, and the shaft 10 and the gear portion 20 are integrated with each other via the coupling body 30 to produce the gear 100. .

  Next, the mold 300 is divided into two parts with the boundary between the second part 320 and the third part 330 as a parting line, and the gear 100 is taken out from the mold 300. Thus, the gear 100 can be obtained.

  According to the first embodiment as described above, the gear 100 is joined to the metal shaft 10, the metal gear portion 20, and the shaft 10 and the gear portion 20, respectively. Are connected to each other. Thereby, compared with the case where the whole gear 100 is metal, the gear 100 can be reduced in weight. And the responsiveness of the rotational drive of the gear 100 improves because the gear 100 is reduced in weight. Further, since the gear portion 20 is made of metal, the entire wear resistance of the gear portion 20 can be obtained equivalent to that of the metal gear 100. Further, since the gear portion 20 located on the side far from the rotation center is made of metal (that is, high specific gravity), and the connecting body 30 located on the rotation center side of the gear portion 20 is made of resin (that is, low specific gravity), Sufficient inertia force can be obtained.

  The gear portion 20 includes an annular gear main body portion 21 and a plurality of teeth 22 provided on the gear main body portion 21 in an annular arrangement along the gear main body portion 21. On the other hand, the shaft 10 passes through the gear main body 21 and is disposed along the axis of the gear main body 21. The connecting body 30 is filled at least between the outer peripheral surface 10a of the shaft 10 and the inner peripheral surface 21b of the gear main body portion 21, and the outer peripheral surface 10a of the shaft 10 and the inner peripheral surface 21b of the gear main body portion 21 are filled. Are joined to each other. Thereby, the structure where the shaft 10 and the gear main-body part 21 were mutually connected via the connection body 30 is realizable.

  Further, the connecting body 30 covers both surfaces (surfaces 21c and 21d) of the gear main body 21 in the axial center direction of the gear main body 21 and is joined to each of the both surfaces. The joint strength with the portion 21 (that is, the joint strength between the coupling body 30 and the gear portion 20) can be improved.

  Moreover, when the joint surface (namely, outer peripheral surface 10a) with the connection body 30 in the shaft 10 is roughened, the joint strength of the shaft 10 and the connection body 30 can be improved by what is called an anchor effect.

  Moreover, when the joint surface (for example, inner peripheral surface 21b, surface 21c, 21d) in the gear part 20 with the connection body 30 is roughened, the joint between the gear part 20 and the connection body 30 is caused by a so-called anchor effect. Strength can be improved.

  Moreover, when the resin material which comprises the connection body 30 contains 1 or more selected from the group which consists of a phenol resin, an epoxy resin, and unsaturated polyester resin, heat resistance, workability, mechanical characteristics, adhesiveness, and Rust prevention property etc. can be made favorable.

  Moreover, when the metal material which comprises the shaft 10 contains aluminum, the shaft 10 can be formed in a lightweight. On the other hand, when the metal material constituting the shaft 10 includes stainless steel, the shaft 10 can be formed with high rigidity.

  Moreover, when the glossiness at a measurement angle of 60 ° measured in accordance with ASTM-D523 is 0.1 or more and 30 or less with respect to the joint surface of the shaft 10 with the joint body 30, the joint strength between the shaft 10 and the joint body 30. Can be further improved.

  Further, the joint surface of the shaft 10 with the connecting body 30 has a plurality of minute recesses (recesses 201), and the cross-sectional shape of the minute recesses opens at least at a part from the opening 203 to the bottom 205 of the minute recesses. In the case of a shape having a portion having a larger cross-sectional width than the portion 203, the bonding strength between the shaft 10 and the coupling body 30 can be further improved.

  Further, a roughened layer 104 provided with a plurality of minute recesses is formed on the joint surface of the shaft 10 with the coupling body 30. When the thickness of the roughened layer 104 is 3 μm or more and 40 μm or less, the shaft 10 and the connection body 30 can be further improved in bonding strength and bonding durability.

  Further, when the ratio of the actual surface area by the nitrogen adsorption BET method to the apparent surface area of the joint surface of the shaft 10 with the connector 30 is 100 or more and 400 or less, the joint strength between the shaft 10 and the connector 30 and the durability of the joint are reduced. This can be further improved.

  Moreover, when the metal material which comprises the gear part 20 contains aluminum, the gear part 20 can be formed in a lightweight. On the other hand, when the metal material which comprises the gear part 20 contains stainless steel, the gear part 20 can be formed with high rigidity.

  Moreover, when the glossiness of the measurement angle 60 degree measured based on ASTM-D523 about the joint surface with the connection body 30 in the gear part 20 is 0.1-30, between the gear part 20 and the connection body 30. The bonding strength can be further improved.

  Further, the joint surface of the gear portion 20 with the coupling body 30 has a plurality of minute recesses (recesses 201), and the cross-sectional shape of the minute recesses is at least partly between the opening 203 and the bottom 205 of the minute recesses. When it has a shape having a portion having a larger cross-sectional width than the opening 203, the joint strength between the gear portion 20 and the coupling body 30 can be further improved.

  Further, the roughened layer 104 provided with a plurality of minute recesses is formed on the joint surface of the gear portion 20 with the coupling body 30, and when the thickness of the roughened layer 104 is 3 μm or more and 40 μm or less, The joining strength between the gear part 20 and the coupling body 30 and the joining durability can be further improved.

  Further, when the ratio of the actual surface area by the nitrogen adsorption BET method to the apparent surface area of the joint surface of the gear part 20 with the connector 30 is 100 or more and 400 or less, the joint strength between the gear part 20 and the connector 30 and the durability of the joint The property can be further improved.

[Second Embodiment]
FIG. 7 is a cross-sectional view of the gear 100 according to the second embodiment. The gear 100 according to the present embodiment is different from the gear 100 according to the first embodiment described above in that a concave portion 23 is formed on the inner peripheral surface 21b of the gear main body portion 21. It is comprised similarly to the gear 100 which concerns on 1st Embodiment.

  That is, in the case of the present embodiment, the concave portion 23 is located on the inner peripheral surface 21b of the gear main body 21 at a position spaced apart from both surfaces (surfaces 21c and 21d) of the gear main body 21 in the axial direction of the gear main body 21. Is formed. That is, the inner peripheral surface 21 b is formed with a recess 23 that is recessed toward the outer peripheral direction of the gear main body 21. A part of the coupling body 30 is filled in the recess 23.

  The recess 23 may be a groove formed continuously over the entire circumference of the inner peripheral surface 21b, or a plurality of recesses 23 are formed intermittently along the circumferential direction of the inner peripheral surface 21b. May be. In addition, it is preferable that the position where the recessed part 23 is formed is an intermediate position between the one surface 21c of the gear main body 21 and the other surface 21d, for example. Moreover, although the cross-sectional shape of the recessed part 23 is not specifically limited, For example, it can be set as a rectangular shape.

  According to the second embodiment as described above, positions on the inner peripheral surface 21b of the gear main body 21 that are separated from both surfaces (surfaces 21c and 21d) of the gear main body 21 in the axial direction of the gear main body 21. A recess 23 is formed in the recess 23, and a part of the coupling body 30 is filled in the recess 23. Therefore, the joint strength between the gear body 21 and the coupling body 30 can be improved by the meshing of the coupling body 30 and the recess 23, and the gear body 21 falls off the coupling body 30 in the axial direction. It is possible to obtain a retaining effect that restricts the occurrence of the loss.

[Third Embodiment]
FIG. 8 is a front view of the gear unit 20 of the gear 100 according to the third embodiment. That is, FIG. 8 shows a shape when the gear portion 20 is viewed in the axial direction of the gear portion 20. The gear 100 according to the present embodiment is different from the gear 100 according to the first embodiment or the second embodiment described above in that the groove 24 is formed on the inner peripheral surface 21b of the gear main body 21. In other respects, the configuration is the same as that of the gear 100 according to the first embodiment or the second embodiment.

  In the present embodiment, a groove 24 is formed on the inner peripheral surface 21 b of the gear main body 21. That is, a groove 24 that is recessed toward the outer peripheral direction of the gear body 21 is formed on the inner peripheral surface 21b. The cross-sectional shape of the groove 24 is not particularly limited, but may be a rectangular shape, for example. The groove 24 is formed, for example, from one surface 21c of the gear main body 21 to the other surface 21d. However, at least one end of the groove 24 may not reach the one surface 21c or the other surface 21d of the gear main body 21.

  The longitudinal direction of the groove 24 has a directional component along the axis of the gear main body 21. In the present embodiment, the longitudinal direction of the groove 24 is parallel to the axial direction of the gear main body 21.

  At least one or more grooves 24 are formed in the inner peripheral surface 21b. In the example of FIG. 8, the plurality of grooves 24 are arranged at regular intervals (equal angular intervals) in the circumferential direction of the inner peripheral surface 21 b of the gear body 21.

  The groove 24 is filled with a part of the coupling body 30. When there are a plurality of grooves 24, each of the grooves 24 is filled with a part of the coupling body 30.

  In addition, when the recessed part 23 in said 2nd Embodiment is also formed in the gear main-body part 21, each recessed part 23 and each groove | channel 24 may be arrange | positioned mutually spaced apart, and at least any one one The recess 23 and at least one of the grooves 24 may be connected to each other (for example, the recess 23 and the groove 24 intersect each other).

  According to the third embodiment as described above, the groove 24 is formed on the inner peripheral surface 21 b of the gear body 21, and the longitudinal direction of the groove 24 has a direction component along the axis of the gear body 21. In the groove 24, a part of the connecting body 30 is filled. Therefore, the joint strength between the gear body 21 and the coupling body 30 can be improved by the engagement between the coupling body 30 and the groove 24, and the gear body 21 is idled with respect to the coupling body 30 around its axis. Can be suppressed.

[Fourth Embodiment]
FIG. 9 is a cross-sectional view of the gear portion 20 of the gear 100 according to the fourth embodiment. The cross section shown in FIG. 9 is a cross section (cross section taken along the arrow) in which the gear 100 is cut along a plane along the axis X of the shaft 10. The gear 100 according to the present embodiment is different from the gear 100 according to the third embodiment in that the gear 100 extends in a direction in which the groove 24 intersects the axis of the gear main body 21. In other respects, the configuration is the same as that of the gear 100 according to the third embodiment.

  That is, in the present embodiment, the groove 24 extends in an oblique direction with respect to the axial direction of the gear main body 21. More specifically, the groove 24 is disposed along a spiral path along the inner peripheral surface 21 b of the gear body 21. Further, for example, the plurality of grooves 24 are arranged in parallel with each other at a predetermined interval such as a constant interval. Also in the present embodiment, the longitudinal direction of the groove 24 has a directional component along the axis of the gear main body 21.

  According to the fourth embodiment as described above, the groove 24 has a directional component along the axis of the gear main body 21 and the longitudinal direction intersects the axis of the gear main body 21. Extends in the direction. Therefore, the meshing of the connecting body 30 and the groove 24 not only provides the same effect as in the third embodiment, but also causes the gear main body portion 21 to drop from the connecting body 30 in the axial direction. A retaining effect is also obtained.

[Fifth Embodiment]
FIG. 10 is a cross-sectional view of the gear 100 according to the fifth embodiment. The gear 100 according to the present embodiment is different from the gear 100 according to the first to fourth embodiments in the points described below, and is otherwise different from the first to fourth embodiments described above. It is comprised similarly to the gear 100 which concerns.

  In each of the above embodiments, the connecting body 30 covers both surfaces (surfaces 21c and 21d) of the gear main body 21 in the axial direction of the gear main body 21 and is bonded to both surfaces. did.

  On the other hand, in the case of this embodiment, the connection body 30 does not cover both surfaces (surfaces 21c and 21d) of the gear main body 21 and is not bonded to both surfaces. As an example, as shown in FIG. 10, both surfaces (surfaces 30 a and 30 b) of the coupling body 30 can be formed flush with both surfaces (surfaces 21 c and 21 d) of the gear main body 21.

  According to the fifth embodiment as described above, the connecting body 30 covers both surfaces (surfaces 21c and 21d) of the gear main body 21 in the axial direction of the gear main body 21 and is joined to both the surfaces. Except for the effects obtained by this, the same effects as those of the first to fourth embodiments can be obtained.

  In each of the above embodiments, the example in which the rotation shaft portion is the shaft 10 has been described, but the rotation shaft portion is not limited to the shaft 10. For example, the rotating shaft portion may be a cylindrical portion into which the shaft is inserted (inserted) unjustly.

  Moreover, although each said embodiment demonstrated the example in which the several tooth | gear 22 was provided in the cylindrical outer peripheral surface 21a of the gear main-body part 21, the several tooth | gear 22 is either one of the gear main-body part 21. It may be provided on the surface (surface 21c or surface 21d). Also in this case, the plurality of teeth 22 are provided on the gear main body 21 in an annular arrangement along the gear main body 21.

  As mentioned above, although embodiment of this invention was described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

  Hereinafter, the present embodiment will be described in detail with reference to examples and comparative examples. In addition, this embodiment is not limited to description of these Examples at all.

(Example 1)
<Adjustment of thermosetting resin composition (P1)>
34.3 parts by mass of novolac type phenolic resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), 6.0 parts by mass of hexamethylenetetramine as a curing agent, and 57.1 masses of glass fiber (manufactured by Nittobo Co., Ltd.) as a filler. Parts, 0.2 parts by mass of γ-aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd.) as a silane coupling agent, 0.5 parts by mass of magnesium oxide (manufactured by Kamishima Chemical Co., Ltd.) as a curing aid, lubricant, etc. 1.9 parts by mass of the other components were each dry-mixed, melted and kneaded with a heating roll at 90 ° C., crushed into a sheet, and pulverized to obtain a granular thermosetting resin composition ( P1) was obtained.

<Preparation of metal parts>
As a metal sheet not subjected to surface treatment, a metal sheet A of aluminum alloy A5052 (80 mm × 10 mm, thickness 1.0 mm, density 2.68 g / cm ³⁾ whose surface was sufficiently polished with # 4000 polishing paper, A thermal conductivity of 138 W / (m · K) was prepared. An aqueous solution of potassium hydroxide (16 parts by mass), zinc chloride (5 parts by mass), sodium nitrate (5 parts by mass), and sodium thiosulfate (13 parts by mass) was prepared. In the obtained aqueous solution (30 ° C.), the metal sheet A was immersed and rocked, and dissolved in the depth direction by 15 μm (calculated from the reduced weight of aluminum). Subsequently, it was washed with water, immersed in a 35 parts by mass aqueous nitric acid solution (30 ° C.) and rocked for 20 seconds. Then, it washed with water and dried and obtained the metal sheet.

<Preparation of test piece>
A metal resin composite was produced using the obtained thermosetting resin composition (P1) and a metal sheet. Specifically, it was produced by the following procedure. First, a metal sheet having a thickness of 1 mm was placed in the mold without being fixed. Next, the thermosetting resin composition (P1) was heated so that the thickness after curing was 3 mm, and a predetermined amount was injected into the mold. At this time, the metal sheet was pressed against the inner wall of the mold by the fluid pressure of the thermosetting resin composition (P1). Finally, by curing the thermosetting resin composition (P1) by compression molding, a test piece that is a two-layer sheet of a resin member sheet (resin member) having a thickness of 3 mm and a metal sheet (metal member) having a thickness of 1 mm is obtained. Obtained. The compression molding conditions were an effective pressure of 20 MPa, a mold temperature of 175 ° C., and a curing time of 3 minutes.

(Example 2)
A test piece was prepared in the same manner as in Example 1 except that the following thermosetting resin composition (P2) was used instead of the thermosetting resin composition (P1).

<Adjustment of thermosetting resin composition (P2)>
In a reaction kettle equipped with a reflux condenser stirrer, a heating device, and a vacuum dehydrator, phenol (p) and formaldehyde (f) are charged at a molar ratio (f / p) = 1.7, and zinc acetate is added to the phenol. 0.5 parts by mass was added to 100 parts by mass, the pH of this reaction system was adjusted to 5.5, and a reflux reaction was carried out for 3 hours. Thereafter, steam distillation was performed at a vacuum degree of 100 Torr and a temperature of 100 ° C. for 2 hours to remove unreacted phenol, and further a reaction was carried out at a vacuum degree of 100 Torr and a temperature of 115 ° C. for 1 hour. A methylene ether type solid was obtained as a resol type phenol resin.

  25.3 parts by mass of the obtained resol type phenol resin, 10.7 parts by mass of novolac type phenol resin (PR-51305, manufactured by Sumitomo Bakelite Co., Ltd.), and 53.5% of glass fiber (manufactured by Nittobo Co., Ltd.) as a filler. 4.9 parts by mass of clay (manufactured by Engel Heart) as a filler, 0.5 part by mass of γ-aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical) as a silane coupling agent, and a curing aid 1.8 parts by mass of slaked lime (manufactured by Chichibu Lime Industry Co., Ltd.) and 3.3 parts by mass of other components such as a lubricant are each dry-mixed and melt-kneaded with a heating roll at 90 ° C. to form a sheet. The cooled product was pulverized to obtain a granular thermosetting resin composition (P2).

(Example 3)
A test piece was prepared in the same manner as in Example 1 except that the thermosetting resin composition (P3) was prepared so as to have the composition shown in Table 1 below.

Example 4
A test piece was prepared in the same manner as in Example 1 except that the thermosetting resin composition (P4) was prepared so as to have the composition shown in Table 2 below.

(Example 5)
A test piece was prepared in the same manner as in Example 1 except that the thermosetting resin composition (P5) was prepared so as to have the composition shown in Table 2 below.

(Example 6)
A test piece was prepared in the same manner as in Example 1 except that the thermosetting resin composition (P6) was prepared so as to have the composition shown in Table 2 below.

(Example 7)
A test piece was prepared in the same manner as in Example 1 except that the thermosetting resin composition (P7) was prepared so as to have the composition shown in Table 2 below.

(Example 8)
A test piece was prepared in the same manner as in Example 1 except that the metal sheet A used in Example 1 and not subjected to the surface treatment was used as the metal sheet.

(Comparative Example 1)
A test piece not containing a resin member was prepared. Specifically, as a metal sheet that has not been surface-treated, a metal sheet D (80 mm × 10 mm, thickness 4.0 mm, density 2.50 mm) of aluminum alloy A5052 whose surface is sufficiently polished with # 4000 polishing paper. 68 g / cm ³ and thermal conductivity 138 W / (m · K)) were prepared and used as test pieces.

(Comparative Example 2)
A test piece containing no metal member was produced. Specifically, after heating the thermosetting resin composition (P1) and injecting a predetermined amount into the mold, the thermosetting resin composition (P1) is cured by compression molding to obtain 80 mm × 10 mm, A test piece consisting only of a resin member having a thickness of 4.0 mm was obtained. The compression molding conditions were an effective pressure of 20 MPa, a mold temperature of 175 ° C., and a curing time of 3 minutes.

  The following measurements and evaluations were performed on the test pieces obtained for each of the examples and comparative examples.

  Thickness of the roughened layer: The cross section of the joint between the metal member and the resin member of the test piece was photographed with a scanning electron microscope (SEM), and the structure of the cross section of the joint was observed. From this observed image, the thickness of the roughened layer of the metal member and the average depth of the recess were determined. In each Example, the thickness of the roughened layer of the metal member of the test piece was 15 μm, and the average depth of the recesses was 13 μm. Further, the cross section of the concave portion has a shape having a cross-sectional width larger than the cross-sectional width of the opening portion in at least a part between the opening portion and the bottom portion of the concave portion. In addition, about the comparative example 1, the surface part of the test piece was cross-sectional observed with the scanning electron microscope, and the thickness of the roughening layer and the average depth of the recessed part were calculated | required. Moreover, about the comparative example 2, the thickness of a roughening layer and the average depth of a recessed part are not measured.

  Specific surface area of metal member: After vacuum-drying the test piece at 120 ° C. for 6 hours, using an automatic specific surface area / pore distribution analyzer (BELSORPmini II, manufactured by Nippon Bell Co., Ltd.), the nitrogen adsorption / desorption amount at the liquid nitrogen temperature was determined. It was measured. The actual surface area by the nitrogen adsorption BET method was calculated from the BET plot. The specific surface area was calculated by dividing the actual surface area measured by the nitrogen adsorption BET method by the apparent surface area. In Comparative Examples 1 and 2 and Example 8, the specific surface area was not measured.

  Glossiness of the surface of the metal member: The glossiness of the surface of the metal member is set to ASTM-D523 using a digital gloss meter (20 °, 60 °) (GM-26 type, manufactured by Murakami Color Research Laboratory Co., Ltd.). The measurement was performed at a measurement angle of 60 ° (incident angle of 60 °, reflection angle of 60 °). In Comparative Examples 1 and 2, glossiness is not measured.

  One million times bending fatigue resistance: The test piece was evaluated for one million times bending fatigue resistance by the method described in the embodiment. Two fulcrums were applied to the surface of the test piece on the metal member side, and an indenter was applied to the center of the surface on the resin member side. In a 25 ° C. atmosphere, the frequency of the repeated stress was 30 Hz, the distance L between the fulcrums was 64 mm, and a bending stress of 140 MPa was continuously applied to the test piece 1 million times. A case where no breakage or peeling occurred even when a stress was repeatedly applied 1 million times was evaluated as ◯, and a case where breakage or peeling occurred while applying a stress 1 million times was evaluated as x. In addition, about the comparative example 1, 1 million times bending fatigue resistance evaluation is not performed.

  Bending strength after 1000 cycles: First, the test piece was fired at 180 ° C. for 8 hours. Next, the test piece after baking was left to stand at −40 ° C. for 1 hour and then subjected to 1000 cycles of heat treatment to stand at 150 ° C. for 1 hour. Next, the bending strength of the test piece was measured according to JIS K6911. The unit was MPa. In the table below, the case where breakage or peeling occurred during 1000 cycles of heat treatment is indicated as x. For Comparative Examples 1 and 2, the bending strength after 1000 cycles was not evaluated.

  Bending elastic modulus after 1000 cycles: First, the test piece was baked at 180 ° C. for 8 hours. 1000 cycles of the heat treatment which left still at -40 degreeC for 1 hour with respect to the test piece after baking obtained in this way were left at 150 degreeC for 1 hour. Next, the bending elastic modulus of the test piece was measured according to JIS K6911. The unit was GPa. In the table below, the case where breakage or peeling occurred during 1000 cycles of heat treatment is indicated as x. In Comparative Examples 1 and 2, the bending elastic modulus after 1000 cycles was not evaluated.

  The evaluation results regarding the above evaluation items are shown in Table 1 and Table 2 below together with the blending ratio of each component.

Since all the test pieces of Examples 1 to 8 are formed by integrally molding a resin member and a metal member, they are lightweight. In particular, with respect to the test pieces of Examples 1 to 7, excellent properties were obtained with respect to 1,000,000 times bending fatigue resistance, bending strength after 1000 cycles, and bending elastic modulus after 1000 cycles. For this reason, it turns out that the gear 100 with light weight and excellent reliability can be obtained by selecting the material and the like in the same manner as the test pieces according to Examples 1 to 7 to produce the gear 100.
On the other hand, since the test piece of Comparative Example 1 is composed only of a metal member, there is a problem in terms of weight reduction. That is, the gear comprised only with the metal member has a subject in terms of weight reduction.
In addition, the test piece of Comparative Example 2 is composed only of a resin member, and is excellent in terms of weight reduction, but does not have 1 million times bending fatigue resistance. For this reason, it turns out that the gear comprised only by the resin member lacks reliability.
In addition, the test piece of Example 8 employs a configuration in which the bonding between the resin member and the metal member is not strong as compared with Examples 1 to 7, and is excellent in terms of weight reduction, but 100 About ten-fold bending fatigue resistance, bending strength after 1000 cycles, and bending elastic modulus after 1000 cycles, the reliability as in each example was not obtained. However, in the evaluation of 1 million times bending fatigue resistance, in Comparative Example 2, fracture occurred by one bending (initial stage), whereas in Example 8, peeling occurred by 20,000 times bending. From this, it can be seen that the test piece of Example 8 is more reliable than the test piece of Comparative Example 2. For this reason, it can be seen that the gear 100 having a light weight and excellent reliability can be obtained by selecting the material and the like in the same manner as the test piece according to the eighth embodiment to produce the gear 100.

10 Shaft (Rotating shaft)
10a outer peripheral surface 12 metal member 14 resin member 16 test piece 20 gear portion 21 gear main body portion 21a outer peripheral surface 21b inner peripheral surface 21c surface 21d surface 22 tooth 23 recess 24 groove 30 coupling body 30a surface 30b surface 100 gear 103 joint surface 104 rough Formation layer 200 mold 201 recess 203 opening 205 bottom 210 first portion 211 resin flow path 220 second portion 221 recess 221b shaft positioning recess 221c cavity configuration recess 222 resin flow path 230 third portion 231 recess 231a gear positioning recess recess 231b Shaft positioning recess 231c Cavity component recess 300 Mold 310 First portion 311 Body portion 312 Protruding portion 313 Through hole 320 Second portion 321 Through hole 330 Third portion 331 Recess 331a Gear positioning recess 331b Shaft positioning recess 331c Cavity It configured recess 340 plunger 701 indenter 703 support table

Claims (17)

A metal rotating shaft,
A metal gear,
A resin coupling body that is joined to the rotating shaft portion and the gear portion, respectively, and connects the rotating shaft portion and the gear portion to each other;
Having gear. The gear portion includes an annular gear body portion, and a plurality of teeth provided on the gear body portion in an annular arrangement along the gear body portion,
The rotating shaft portion passes through the gear main body portion and is disposed along the axis of the gear main body portion;
The coupling body is filled at least between the outer peripheral surface of the rotating shaft portion and the inner peripheral surface of the gear main body portion, and the outer peripheral surface of the rotating shaft portion and the inner peripheral surface of the gear main body portion respectively. The gear according to claim 1 which is joined.   The gear according to claim 2, wherein the coupling body covers both surfaces of the gear main body portion in the axial direction of the gear main body portion and is joined to each of the both surfaces. On the inner peripheral surface of the gear main body, recesses are formed at positions spaced from both surfaces of the gear main body in the axial direction of the gear main body,
The gear according to claim 2 or 3, wherein a part of the coupling body is filled in the recess. A groove is formed on the inner peripheral surface of the gear body,
The longitudinal direction of the groove has a directional component along the axis of the gear main body,
The gear according to any one of claims 2 to 4, wherein a part of the coupling body is filled in the groove.   The gear according to claim 5, wherein the groove extends in a direction intersecting with an axis of the gear main body.   The gear as described in any one of Claims 1 thru | or 6 in which the resin material which comprises the said connection body contains 1 or more selected from the group which consists of a phenol resin, an epoxy resin, and an unsaturated polyester resin.   The gear according to any one of claims 1 to 7, wherein the metal material constituting the rotating shaft portion includes aluminum or stainless steel.   9. The glossiness at a measurement angle of 60 °, measured according to ASTM-D523, is 0.1 to 30 in the joint surface of the rotating shaft portion with the coupling body. 9. The gear described. The joint surface with the coupling body in the rotating shaft portion has a plurality of minute recesses,
10. The cross-sectional shape of the minute recess is any one of claims 1 to 9, wherein at least a portion between the opening and the bottom of the minute recess has a portion having a larger cross-sectional width than the opening. The gear described in the paragraph.   The roughening layer provided with a plurality of the above-mentioned minute crevices is formed in the joint surface with the above-mentioned connecting body in the above-mentioned rotation axis part, and the thickness of the above-mentioned roughening layer is 3 micrometers or more and 40 micrometers or less. Gear described in.   The gear according to any one of claims 1 to 11, wherein a ratio of an actual surface area by the nitrogen adsorption BET method to an apparent surface area of the joint surface of the rotating shaft portion with the coupling body is 100 or more and 400 or less.   The gear as described in any one of Claims 1 thru | or 12 with which the metal material which comprises the said gear part contains aluminum or stainless steel.   14. The glossiness at a measurement angle of 60 °, measured according to ASTM-D523, is 0.1 to 30 in the joint surface of the gear portion with the connector. 14. Gear. The joint surface with the coupling body in the gear portion has a plurality of minute recesses,
The cross-sectional shape of the minute recess is any one of claims 1 to 14, wherein at least a portion between the opening and the bottom of the minute recess has a portion having a larger cross-sectional width than the opening. The gear described in the paragraph.   The roughening layer provided with a plurality of the above-mentioned minute concave parts is formed in the joint surface with the above-mentioned connecting part in the above-mentioned gear part, and the thickness of the above-mentioned roughening layer is 3 micrometers or more and 40 micrometers or less. The gear described.   The gear according to any one of claims 1 to 16, wherein a ratio of an actual surface area according to a nitrogen adsorption BET method to an apparent surface area of the joint surface of the gear portion with the connector is 100 or more and 400 or less.

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