WO2020017375A1

WO2020017375A1 - Bearing device

Info

Publication number: WO2020017375A1
Application number: PCT/JP2019/026977
Authority: WO
Inventors: 鈴木　達也; 健裕小池
Original assignee: 中央可鍛工業株式会社
Priority date: 2018-07-17
Filing date: 2019-07-08
Publication date: 2020-01-23
Also published as: JP7045950B2; JP2020012502A

Abstract

Provided is a bearing device which can be made lightweight. A bearing device B is provided with an annular shaft bearing section 1 into which a shaft is inserted through a bearing, a bolt hole formation section 3 into which a bolt for affixing the shaft bearing section 1 to an affixation section is inserted, and a bracket 2 for connecting the shaft bearing section 1 and the bolt hole formation section 3. The shaft bearing section 1 is formed from metal having high mechanical durability, and the bracket 2 is formed from a resin mixture which enables the bearing device B to be lightweight.

Description

Bearing device

The present invention relates to a bearing device for a bearing that rotatably supports a shaft.

For example, in a vehicle, a ship, and an aircraft (hereinafter, referred to as a vehicle), the bearing device is a transport line, a production line (hereinafter, a transport device, or the like) as a bearing that rotatably supports a shaft that transmits power. ) Is used as a bearing for rotatably supporting a conveyor for moving objects. BACKGROUND ART As a bearing device of a bearing that rotatably supports a shaft, a bearing device formed of an iron alloy by casting has been conventionally known in Patent Literature 1 below. This bearing device has excellent durability because the case that rotatably supports the shaft and the bracket to which the case is fixed are formed from an iron alloy by casting.

JP-A-2017-116052

In a vehicle, a transportation device, or the like, if the constituent parts are heavy, the load on the vehicle, the transportation device, or the like becomes large. Therefore, the parts including the bearing device are required to be lightweight.

However, since the conventional bearing device described in Patent Document 1 is formed from an iron alloy by casting, it has not been studied to reduce the weight. In addition, in Patent Document 1, there is a description that one or both of the case and the bracket constituting the bearing device may be made of resin, but in the embodiment, no specific description is made. No effect is suggested. Further, there has been no study on the adverse effects of using resin for a part of the bearing device.

The present invention has been made in view of the above points, and has as its object to provide a bearing device that can achieve weight reduction.

A bearing device according to the present invention includes an annular shaft bearing portion through which a shaft is inserted via a bearing, a bolt hole forming portion into which a bolt for fixing the shaft bearing portion to a fixed portion is inserted, and the shaft bearing. And a bracket for connecting the part and the bolt hole forming part,
The shaft bearing portion is formed from a metal, and the bracket is formed from a resin mixture.

According to the bearing device of the present invention, the annular shaft bearing portion into which the shaft is inserted via the bearing is formed of metal. For this reason, the bearing device becomes excellent in bending strength, compression strength, and tensile strength (hereinafter, referred to as mechanical strength) due to the characteristics of the metal. In addition, the weight of the bearing device is reduced because the bracket for connecting the shaft bearing portion and the bolt hole forming portion to be integrated is formed of a resin mixture that is lighter than metal. That is, the bearing device of the present invention has excellent mechanical strength and can be reduced in weight.

Here, in the bearing device, the resin mixture may be a fiber-mixed resin.

According to this, the mechanical strength of the bracket formed from the resin mixture can be increased.

In the bearing device, the metal forming the shaft bearing portion may be the same as the metal forming the bearing.

According to this, the shaft bearing portion and the bearing are formed of the same metal, and have the same coefficient of thermal expansion, so that they are stable against temperature changes, and (standard) charge transfer due to the difference in electrode potential is difficult. The generation of rust can be suppressed.

In addition, in the above bearing device, a configuration may be employed in which an uneven portion having an uneven shape is formed on an outer peripheral portion of the shaft bearing portion, and the uneven portion is covered by the bracket.

According to this, the contact area between the outer peripheral portion of the shaft bearing portion and the resin mixture forming the bracket can be increased by the uneven portion on the outer peripheral portion of the shaft bearing portion, and the adhesiveness can be improved.

In the bearing device, the shaft may be a drive shaft for a vehicle, a ship, or an aircraft.

According to this, since the weight of the bearing device is reduced, the weight of a vehicle or the like using the bearing device of the embodiment can be reduced.

According to the bearing device of the present invention, since the annular shaft bearing portion through which the shaft is inserted through the bearing is formed of metal, the bearing device has excellent mechanical strength. Further, since the bracket connecting the shaft bearing portion and the bolt hole forming portion is formed of a resin mixture, the weight of the bearing device can be reduced.

It is a front view of a bearing device of an embodiment of the present invention. It is a top view of the same bearing device. FIG. 3 is a sectional view taken along the line III-III of FIG. 1. FIG. 4 is a sectional view taken along line IV-IV of FIG. 1. FIG. 5 is a sectional view taken along line VV of FIG. 2. It is VI-VI sectional drawing of FIG. It is a front view of a shaft bearing part. It is a left view of a shaft bearing part. It is a rear view of the shaft bearing part with a partial enlarged view.

Hereinafter, a bearing device according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the bearing device B is a bearing device in which a drive shaft (not shown) for a vehicle or the like is fixed to the vehicle or the like via an annular bearing (not shown). The bearing that has passed through is accommodated in the bearing accommodation portion 11 of the shaft bearing portion 1, and the

base portions

23 and 24 of the bracket body 21 are fixed to the fixed portion on the vehicle etc. side by bolts (not shown). The bearing device B includes a shaft bearing portion 1, a reinforcing metal member 31 serving as a bolt hole forming portion 3 provided in the

base portions

23 and 24, and a bracket 2 connecting the shaft bearing portion 1 and the reinforcing metal member 31. ing. Here, before and after the bearing device B, as shown in FIG. 2, one of the axial directions of the inserted drive shaft is set to the front, and the other is set to the rear. In FIG. 1, the near side is the front. The left and right are the left and right when the bearing device B is viewed from the front, the side where the screw hole 18 of the shaft bearing 1 is located is the left, and the opposite is the right. Up and down, the

bases

23 and 24 are lower, and the shaft bearing 1 is upper. In the embodiment, a bearing device B for a vehicle driveshaft will be described as an example, but the present invention is also applicable to a bearing device serving as a bearing for a conveyor on a transportation line or a production line.

As shown in FIGS. 7 to 9, the shaft bearing portion 1 has an annular bearing accommodating portion 11, and has an uneven shape on the rear side of the outer peripheral portion to enhance adhesion to an annular covering portion 22 of the bracket 2 described later. Are formed.

It is preferable to use the same metal that forms the shaft bearing 1 as the metal that forms the bearing. Since the metal forming the shaft bearing 1 and the metal forming the bearing are the same, the shaft bearing 1 and the bearing have the same coefficient of thermal expansion, so that they are stable against a temperature change, and the vibration This is because the generation of a gap between the shaft bearing portion 1 and the bearing, which can be a cause, can be suppressed, and the occurrence of rust can be suppressed because charge transfer due to the difference in electrode potential is difficult. In the embodiments, the phrase “the same metal” means that among the elements constituting the metal, the type of the metal element contained most is the same.

金属 Since most of the metals used for the bearings are iron alloys, the shaft bearing portion 1 is formed of an iron alloy. Specifically, a spheroidal graphite cast iron FCD500 (JIS G5502: 2001) was used. Spheroidal graphite cast iron products have excellent tensile strength and heat resistance, and have excellent durability as bearings. The shaft bearing portion 1 was formed by casting with a mold, which was inexpensive to manufacture and suitable for mass production.

内径 The inner diameter of the bearing housing 11 is formed smaller (narrower) than the outer diameter of the bearing to be housed. This is because the inside of the hole 12 of the bearing accommodating portion 11 is accurately cut in accordance with the outer diameter of the bearing, and a margin (cut allowance) is left so that positional accuracy can be ensured.

～ As shown in FIGS. 7 to 9, the shaft bearing 1 has one screw hole 18 penetrating the inner periphery on the outer periphery. The screw hole 18 is for fixing the bearing by tightening it with a screw when the bearing is housed in the shaft bearing portion 1.

As shown in FIG. 9, the uneven portion 14 having the uneven shape is formed on an outer peripheral portion of the annular shaft bearing portion 1 excluding the vicinity of the screw hole 18, and in the embodiment, a rear portion of the outer peripheral portion of the shaft bearing portion 1. It is provided only on the side. By forming the uneven shape on the outer peripheral portion of the shaft bearing portion 1, it is possible to enhance the adhesion to the resin mixture forming the annular coating portion 22 that covers the outer periphery of the shaft bearing portion 1 described later. As shown in the enlarged view of FIG. 9, the edge 15 of the convex portion of the concave-convex portion 14 is formed such that the edge 15 is formed at an acute angle of α and the resin mixture forming the bracket 2 penetrating into the bottom of the concave portion is physically separated. It has a difficult shape.

The reinforcing metal member 31 is a metal member for forming the bolt hole forming portion 3 provided in the base portion 23. As shown in FIG. 6, the reinforcing metal member 31 has a substantially cylindrical shape having a flange at an upper portion, and is formed of carbon steel (S45C). I have.

The bracket 2 connects the shaft bearing portion 1 and the reinforcing metal member 31 integrally, is formed from a resin mixture, and is formed by a molding die. As the resin used for the resin mixture, two types of resins were used separately. One of the resins used was a polyamide resin that was a thermoplastic resin, and the other was a phenol resin that was a thermosetting resin. By using a polyamide resin or a phenol resin for the resin used in the resin mixture, the bracket 2 can have excellent heat resistance and mechanical strength.

ガラス The resin mixture used for the bracket 2 was mixed with glass fibers as fibers to obtain a fiber-mixed resin. By mixing fibers in the resin mixture, the curing shrinkage of the resin can be reduced, and the physical strength can be increased. The mixing ratio of the fibers in the fiber mixed resin was set to 40% by mass in order to efficiently increase the physical strength.

As shown in FIGS. 1 and 5, the bracket 2 forms an annular covering portion 22 by covering the outer peripheral portion of the shaft bearing portion 1 except for the screw holes 18 as shown in FIGS. A leg 25 is formed to be connected to the base 23 of the annular cover 22, and a leg 26 is formed to be connected to the right base 24 from the lower right of the annular covering portion 22.

As shown in FIG. 1,

beams

25a and 26a are formed on the outside of the

legs

25 and 26 at right angles to the legs (parallel to the shaft axis) to increase the strength. FIG. 4 is a sectional view of the left and right legs 25 and 26 (a sectional view taken along line IV-IV in FIG. 1).

The

bases

23 and 24 are formed in a flat plate shape parallel to the center axis of the drive shaft penetrated through the shaft bearing portion 1, and as shown in FIG. A stop is made. The bolt hole forming portions 3 of the

base portions

23 and 24 are reinforced by reinforcing metal fittings 31 so as not to cause a loss due to bolting.

The bracket 2 is formed by forming a mold. In the molding, a mold release agent is applied to a mold having a shape of the bearing device B, the bearing housing 11 and the reinforcing bracket 31 are set at predetermined positions, and the resin mixture is poured into the mold. The mold was previously heated to 200 ° C. (preheating), and the resin mixture was heated to 200 ° C. to promote fluidity. After the resin mixture is cured, the mold is removed and deburring is performed to complete the bearing device B.

技術 The technical idea grasped from the bearing device B of the embodiment configured as described above will be described below.

The bearing device B according to the present invention includes: an annular shaft bearing portion 1 through which a shaft is inserted via a bearing; a bolt hole forming portion 3 into which a bolt for fixing the shaft bearing portion 1 to a fixed portion is inserted; A bracket 2 for integrating the shaft bearing portion 1 and the bolt hole forming portion 3; wherein the shaft bearing portion 1 is formed of metal and the bracket 2 is formed of a resin mixture.

According to the bearing device B of the present invention, since the annular shaft bearing portion 1 is formed of metal, the bearing device B has excellent mechanical strength due to the characteristics of the metal. Further, since the bracket 2 is formed from the resin mixture, the weight of the bearing device B is reduced by the characteristics of the resin mixture, and vibration from the shaft can be suppressed.

Here, in the bearing device B, the resin mixture may be a fiber-mixed resin.

According to this, the mechanical strength can be increased while keeping the weight of the bracket 2 formed of the resin mixture light, and the curing shrinkage that occurs when the resin is cured can be reduced. In addition, expansion and contraction due to a temperature change during use as a bearing device can be suppressed.

In the bearing device B, the metal forming the shaft bearing portion 1 can be the same as the metal forming the bearing.

According to this, the shaft bearing portion 1 and the bearing are formed of the same metal, and have the same coefficient of thermal expansion, so that they are stable against temperature changes, and the gap between the shaft bearing portion 1 and the bearing which causes vibration is generated. Occurrence of rust can be suppressed because the generation of electric charge is small due to the difference in electrode potential.

In addition, in the bearing device B, an uneven portion 14 having an uneven shape may be formed on an outer peripheral portion of the shaft bearing portion 1, and the uneven portion 14 may be covered with a resin mixture forming the bracket 2.

According to this, the contact area between the outer peripheral portion of the shaft bearing portion 1 and the resin mixture forming the bracket 2 is increased by the uneven portions 14 on the outer peripheral portion of the shaft bearing portion 1, and the mechanical strength is also increased. Can be improved.

In the bearing device B, the shaft may be a drive shaft for a vehicle, a ship, or an aircraft.

According to this, since the bearing device B has excellent mechanical strength and the bracket 2 is formed from a resin mixture, the bearing device B can be reduced in weight and can suppress vibration from the shaft. Become.

The bearing device B of the embodiment can be implemented even if the configuration is changed to the following form.

In the embodiment, the shaft bearing 1 is formed by casting, but may be formed by forging. In the case of forging, the production cost is higher than that of casting, but the internal stress of the shaft bearing 1 can be reduced.

As the cast iron used for forming the shaft bearing portion 1 and the reinforcing metal member 31, in the embodiment, the spheroidal graphite cast iron product FCD500 was used. However, the spheroidal graphite cast iron products (FCD350, FCD400, FCD450, FCD600, FCD700, FCD800) can be used. This is because of excellent mechanical strength.

In the embodiment, a polyamide resin is used as the thermoplastic resin of the resin mixture forming the bracket 2. However, thermoplastic resins such as polypropylene, polyvinyl chloride, polystyrene, acrylic resin, polycarbonate resin, ABS resin, and the like having excellent heat resistance are used. Can be used.

In the embodiment, a phenol resin is used as the thermosetting resin of the resin mixture forming the bracket 2, but a thermosetting resin such as an amino resin or a urea resin can be used. This is because the heat resistance is excellent.

In the embodiment, glass fibers which are inorganic fibers are used as the fibers of the fiber-mixed resin which is the resin mixture forming the bracket 2. However, inorganic fibers such as carbon fibers, metal fibers, and ceramic fibers, cellulose fibers, acrylic fibers, Organic fibers such as polyamide fibers and polyester fibers can also be used.

混入 In the embodiment, the mixing ratio of the fibers in the fiber-mixed resin is set to 40% by mass, but may be used if it is 10 to 70% by mass. If the mixing ratio is less than 10% by mass, the strength may not be sufficiently increased. On the other hand, if it exceeds 70% by mass, the density of the fiber-mixed resin increases, and the weight of the bearing device B may not be reduced. More preferably, it is 20 to 60% by mass, and still more preferably, 30 to 50% by mass.

In the embodiment, the fiber mixed resin is a resin in which the resin is a polyamide resin or a phenol resin and glass fiber is mixed at 40% by mass. However, a commercially available product can also be used. Commercially available glass fiber mixed resins include A1022GFL15, A1022GFL, A1030GFL, A1030GFL45, A1022GFL60 (A), EX-8406G30, A175S, A190S, A192S, A690S (all manufactured by Unitika Ltd.), CM1011G-15, CM1001G-15, CM1001G-20, CM1011G-30, CM1016G-30, CM1011G-45, CM1012G-45N, CM3001G-15, CM3006G-15, CM3001G-30, CM3006G-30, CM3001G-45, CM3006G-45 (all manufactured by Toray Industries, Inc.) ) Can be used.

(4) The preheating temperature of the mold for forming the mold of the bracket 2 is 200 ° C. in the embodiment, but if it is 160 to 250 ° C., the fluidity of the resin mixture can be promoted. Further, the heating temperature of the resin mixture in the mold forming is 200 ° C. in the embodiment, but if it is 190 to 210 ° C., the fluidity of the resin mixture can be promoted. When the resin mixture is a thermosetting resin, the curing time can be promoted by heating the resin mixture.

The technical idea of the bearing device according to the embodiment can be applied not only to the bearing device that supports the shaft, but also to a bush accommodating portion such as a cab mount bracket and a differential support.

DESCRIPTION OF SYMBOLS 1 ... Shaft bearing part, 2 ... Bracket, 3 ... Bolt hole formation part, 11 ... Bearing accommodation part, 12 ... Hole, 14 ... Uneven part, 15 ... Edge, 18 ... Screw hole, 21 ... Bracket body, 22 ... Annular coating Part, 23, 24 ... base part, 25, 26 ... leg part, 25a, 26a ... beam, 31 ... reinforcing bracket, B ... bearing device.

Claims

An annular shaft bearing portion through which a shaft is inserted via a bearing, a bolt hole forming portion into which a bolt for fixing the shaft bearing portion to a fixed portion is inserted, the shaft bearing portion and the bolt hole forming portion, And a bracket for connecting
The bearing device, wherein the shaft bearing portion is formed of a metal, and the bracket is formed of a resin mixture.
The bearing device according to claim 1, wherein the resin mixture is a fiber-mixed resin.
The bearing device according to claim 1, wherein the metal forming the shaft bearing portion is the same as the metal forming the bearing.
The bearing device according to claim 1, wherein an uneven portion having an uneven shape is formed on an outer peripheral portion of the shaft bearing portion, and the uneven portion is covered by the bracket.
The bearing device according to claim 1, wherein the shaft is a drive shaft for a vehicle, a ship, or an aircraft.