JP7109915B2 - Covered plain bearings and drive modules - Google Patents

Description

The present invention relates to plain bearings with coatings and drive modules.

For example, it is known that rolling bearings are used to convey objects such as banknotes and tickets on the outer ring of the rolling bearing, and to roll the rolling bearing as a wheel of a moving body along a contacting object. In this case, the outer surface of the outer ring is coated with urethane rubber to increase the frictional force with the conveyed object or the contacting object and to reduce noise when the outer ring is in rolling contact. Sometimes.
Urethane rubber is excellent in wear resistance and can be firmly adhered and fixed to the outer ring. The manufacturing process for attaching urethane rubber to the outer ring is as follows.

First, the outer peripheral surface of the outer ring of the rolling bearing is roughened by sandblasting, and an adhesive is applied to the roughened outer peripheral surface. Next, the rolling bearing is set in a mold, a urethane raw material (liquid) is poured between the outer peripheral surface and the mold, and pressure is applied to the mold for molding. Then, it is held in a mold at a high temperature for a predetermined time (about half a day to one day, depending on hardness). The urethane rubber is cured at a high temperature, and the adhesive is heated to a high temperature to vulcanize and bond the urethane rubber to the outer peripheral surface. After vulcanization bonding, the outer peripheral surface of the urethane is polished to a predetermined dimension and accuracy. As a result, the outer peripheral surface of the outer ring of the rolling bearing is covered with urethane rubber (see Patent Document 1, for example).

Japanese Utility Model Laid-Open No. 6-87717

However, conventional rolling bearings have the following problems.
In other words, the urethane rubber must be cured for a long time in the mold, and it takes time to apply the adhesive to the outer peripheral surface of the outer ring. need to be finished.
Therefore, when mass-producing rolling bearings whose outer peripheral surfaces are coated with urethane rubber, it is necessary to provide a large number of equipment for coating the outer peripheral surfaces with urethane rubber, which increases the equipment cost. In addition, a process of roughening the outer peripheral surface of the outer ring by sandblasting and a process of applying an adhesive to the roughened outer peripheral surface are required. Therefore, it is difficult to inexpensively mass-produce rolling bearings coated with urethane rubber.

SUMMARY OF THE INVENTION The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a plain bearing with a coated layer and a drive module that can be manufactured in large quantities at low cost.

In order to solve the above problems, a plain bearing with a coating layer according to an aspect of the present invention comprises a plain bearing having a cylindrically formed bearing surface, and an axis line of the plain bearing on the radially outer side of the plain bearing. A first coating layer coaxially formed and injection-molded with a thermoplastic elastomer , and a second coating layer interposed between the outer peripheral surface of the slide bearing and the first coating layer, The second coating layer is made of a material softer than the slide bearing, and the first coating layer is made of a material harder than the second coating layer .

According to this configuration, for example, when the sliding bearing is made of a resin material, the first coating layer of the thermoplastic elastomer is insert-molded on the outer peripheral surface of the sliding bearing by injection molding. Therefore, the first coating layer is firmly welded to the outer peripheral surface of the sliding bearing by heat-sealing. This can prevent the first coating layer from falling off from the outer peripheral surface of the slide bearing.
Also, the first coating layer is firmly fixed to the outer peripheral surface of the slide bearing by heat sealing during injection molding. Therefore, a sandblasting process and an adhesive coating process, which have conventionally been required, can be eliminated. As a result, the slide bearing can be manufactured in large quantities at low cost.
Furthermore, the first coating layer is firmly fixed to the outer peripheral surface of the slide bearing by heat sealing. As a result, when conveying objects such as banknotes and tickets on the first coating layer, or when rolling the slide bearing as a wheel of a moving body along the contact object, the first coating layer generates noise. can be reduced.
According to this configuration, by interposing the second coating layer between the outer peripheral surface of the sliding bearing and the first coating layer, the first coating layer extends to the outer periphery of the sliding bearing through the second coating layer. It becomes possible to fix firmly to the surface. That is, for the second coating layer, a material having excellent heat-sealing properties with respect to both the slide bearing and the first coating layer can be selected. Therefore, the second coating layer can be firmly fixed to the outer peripheral surface of the sliding bearing by heat-sealing. Also, the first coating layer can be firmly fixed to the outer peripheral surface of the second coating layer by heat sealing. Thereby, the first coating layer can be firmly fixed to the outer peripheral surface of the sliding bearing via the second coating layer.
According to this configuration, the second coating layer is interposed between the slide bearing and the first coating layer. Also, the second coating layer was formed of a material softer than that of the slide bearing. Furthermore, the first coating layer was made of a harder material than the second coating layer. By forming the first coating layer with a harder material than the second coating layer, the wear resistance and durability of the first coating layer can be ensured.
On the other hand, by forming the second coating layer with a material that is softer than the sliding bearing and the first coating layer, sound (noise) is generated in the second coating layer when the sliding bearing with the coating layer is driven. can be suppressed, and the sound (noise) can be reduced.

In the above aspect, the slide bearing may be made of plastic such as polycarbonate, ABS resin, or an alloy of polycarbonate and ABS resin.

According to this configuration, the slide bearing is made of plastic. Therefore, the plastic of the sliding bearing can be amorphous plastic. Amorphous plastics have excellent heat-sealing properties with respect to thermoplastic elastomers. Therefore, when injection-molding the first coating layer of the thermoplastic elastomer, the first coating layer of the thermoplastic elastomer can be well heat-sealed to the outer peripheral surface of the sliding bearing. As a result, the first coating layer can be more firmly fixed to the outer peripheral surface of the sliding bearing.

In the above aspect, the outer peripheral surface of one of the sliding bearing on which the first coating layer is formed and the second coating layer has a protrusion projecting radially outward at the center in the axial direction. may

According to this configuration, the protrusion is formed on the outer peripheral surface of the second coating layer, and the first coating layer is heat-sealed to the protrusion on the outer peripheral surface. Therefore, the protrusion can prevent the first coating layer from coming off from the outer peripheral surface of the second coating layer due to the engagement of the first coating layer with the protrusion. This can reliably prevent the first material layer from falling off the outer peripheral surface of the second coating layer.

In the above aspect, the first coating layer is formed of a thermoplastic elastomer filled from a gate, and the gate is located between the outermost periphery on the inner peripheral surface and the outermost periphery on the outer peripheral surface of the first coating layer. It may be formed in an opening larger than the thickness dimension of the first coating layer, which is the distance, and may be arranged so as to overlap both the first coating layer and the second coating layer in the axial direction.

According to this configuration, the gate is opened larger than the thickness dimension of the first coating layer. In addition, the gate was positioned so as to axially overlap both the second cladding layer and the first cladding layer. As a result, even when the thickness dimension of the first coating layer is reduced, the first coating layer can be formed satisfactorily.
Furthermore, the outer peripheral portion of the second coating layer can be filled with the thermoplastic elastomer under high pressure. Thereby, the adhesion between the second coating layer and the first coating layer can be enhanced.

In order to solve the above problems, a drive module according to one aspect of the present invention includes the slide bearing with the coating layer.

According to this configuration, by providing the drive module with the sliding bearing with the coating layer described above, durability can be ensured and the drive module can be manufactured at low cost.

According to one aspect of the present invention, the first coating layer is formed on the sliding bearing by injection molding of a thermoplastic elastomer. As a result, it is possible to mass-produce plain bearings with coating layers at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the sliding bearing with a coating layer which concerns on 1st Embodiment of this invention. 4 is a graph showing the characteristics of a state in which the first coating layer according to the first embodiment of the present invention contains potassium titanate fibers. FIG. 4 is a cross-sectional view showing a first modification of the slide bearing with a coating layer according to the first embodiment of the present invention; FIG. 5 is a side view showing a second modified example of the bearing according to the first embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the mobile body provided with the sliding bearing with a coating layer which concerns on 1st Embodiment of this invention. FIG. 6 is a cross-sectional view showing a slide bearing with a coating layer according to a second embodiment of the present invention; FIG. 5 is a cross-sectional view showing a slide bearing with a coating layer according to a third embodiment of the present invention; FIG. 11 is a cross-sectional view showing a plain bearing with a coating layer according to a fourth embodiment of the present invention; FIG. 11 is a cross-sectional view showing a slide bearing with a coating layer according to a fifth embodiment of the present invention; It is a sectional view showing a modification concerning one embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view of a plain bearing 10 with a coating layer according to the first embodiment.
As shown in FIG. 1 , the coated slide bearing 10 includes a slide bearing 12 and a first coated layer 14 .
The sliding bearing 12 has a cylindrical bearing surface 16 and an outer peripheral surface 17 . The bearing surface 16 is formed in an arc shape on the inner peripheral surface of the sliding bearing 12 and is rotatably fitted to the support shaft 19 . The slide bearing 12 is rotatably supported around a support shaft 19 . The outer peripheral surface 17 is formed radially outward of the sliding bearing 12 with a constant distance from the bearing surface 16 .
The bearing surface 16 and the outer peripheral surface 17 are formed coaxially with respect to the axis O of the sliding bearing 12 .

The sliding bearing 12 is made of hard plastic (amorphous plastic), for example. Preferred amorphous plastics include polycarbonate, ABS resin, and alloys of polycarbonate and ABS resin.
By forming the slide bearing 12 from hard plastic, for example, the wear resistance of the bearing surface 16 against the support shaft 19 can be ensured.
A solid lubricant such as polytetrafluoroethylene (tetrafluoroethylene, PTFE) is preferably added to this hard plastic.

A first coating layer 14 is formed on the outer peripheral surface 17 of the sliding bearing 12 . The first coating layer 14 is heat-sealed to the outer peripheral surface 17 of the sliding bearing 12 by insert molding using injection molding. The first coating layer 14 is annularly formed with a constant thickness dimension T1. Moreover, the width dimension of the first coating layer 14 is set to be the same as the width dimension of the slide bearing 12 .
The first coating layer 14 is injection molded on the outer peripheral surface 17 of the plain bearing 12 with a thermoplastic elastomer (TPE). The thermoplastic elastomer has excellent heat-sealing properties with the amorphous plastic that is the material of the sliding bearing 12 .
Styrene-based (TPS), olefin-based (TPO), vinyl chloride-based (PPVC), urethane-based (TPU), and polyester-based (TPEE) are applicable as thermoplastic elastomers. Urethane-based (TPU), polyester-based (TPEE), and styrene-based (TPS) are preferred from the viewpoint of mechanical strength and abrasion resistance. Further preferred thermoplastic elastomers include polyesters (TPEE).
Urethane-based (TPU) has the best abrasion resistance, but has problems with moldability and requires sufficient drying due to its high hygroscopicity. Furthermore, an annealing treatment is also required, which takes a long time to manufacture and poses a problem of molding accuracy. In addition, urethane-based thermoplastic elastomers have the highest mechanical strength and abrasion resistance. Therefore, urethane-based materials are used when the coating layer 18 requires mechanical strength and abrasion resistance.

Among thermoplastic elastomers other than urethane, polyester-based (TPEE) is the most excellent in wear resistance and mechanical strength, and is also excellent in heat-sealability with hard plastics. In addition, polyester (TPEE) is suitable as a material for the coating layer 18 because it has low hygroscopicity and good moldability.

Here, polyester-based (TPEE) is preferable as the thermoplastic elastomer of the first coating layer 14 . Polyester-based materials are excellent in wear resistance and mechanical strength, and are also excellent in heat-sealing properties with hard plastics (that is, slide bearing 12).
Thermal fusion means, for example, that the thermoplastic elastomer of the first coating layer 14 is melted by heating and adheres to the hard plastic (the outer peripheral surface 17 of the sliding bearing 12).
Therefore, the effect is exhibited at the time of two-color molding. In addition, polyester (TPEE) has low hygroscopicity and good moldability, so it is most suitable as a material for the first coating layer 14 of the slide bearing 10 with a coating layer.

Here, the slide bearing 12 is made of hard plastic (amorphous plastic). Amorphous plastic has excellent heat-sealing properties with respect to the thermoplastic elastomer of the first coating layer 14 . Therefore, when the thermoplastic elastomer first covering layer 14 is injection molded, the thermoplastic elastomer first covering layer 14 can be well heat-sealed to the outer peripheral surface 17 of the sliding bearing 12 . Thereby, the first coating layer 14 can be fixed to the outer peripheral surface 17 of the plain bearing 12 more firmly.

From the viewpoint of suppressing sound (noise), the duro hardness A of the first coating layer 14 is preferably 75-95. For example, a duro hardness A of 92 is particularly preferable from the viewpoint of suppressing sound (noise) satisfactorily and ensuring the mechanical strength and abrasion resistance of the first coating layer 14 satisfactorily. If the duro hardness A is less than 75, the mechanical strength and wear resistance of the first coating layer 14 may become problematic.

According to the covered slide bearing 10, the slide bearing 12 is made of hard plastic (amorphous plastic), for example. A first coating layer 14 of thermoplastic elastomer is insert-molded on the outer peripheral surface 17 of the sliding bearing 12 by injection molding.
Therefore, the first coating layer 14 is firmly welded to the outer peripheral surface 17 of the slide bearing 12 by thermal fusion. This can prevent the first coating layer 14 from coming off the outer peripheral surface 17 of the slide bearing 12 .

Also, the first coating layer 14 is firmly fixed to the outer peripheral surface 17 of the slide bearing 12 by heat fusion during injection molding. Therefore, a sandblasting process and an adhesive coating process, which have conventionally been required, can be eliminated. As a result, the slide bearing can be manufactured in large quantities at low cost.

By the way, when the first coating layer 14 is made of a thermoplastic elastomer, the first coating layer 14 is insert-molded on the outer peripheral surface 17 of the sliding bearing 12 by injection molding. A mold is used to injection mold the first coating layer 14 , and the gate G<b>1 of the mold is located at a position corresponding to the coating side 14 a of the first coating layer 14 . The first covering layer 14 is insert-molded on the outer peripheral surface 17 of the slide bearing 12 by filling the inside (cavity) of the mold with the molten thermoplastic elastomer through the gate G1.
By providing the gate G1 of the mold at a position corresponding to the covering side surface 14a of the first covering layer 14, the filling point of the thermoplastic elastomer can be shifted from the covering outer peripheral surface 18 of the first covering layer 14.

Also, the parting line PL of the mold is positioned on the covering side surface 14a of the first covering layer 14 in the direction of the axis O of the sliding bearing 12, for example. The covering side surface 14 a is formed as a recess at one end 18 a of the covering outer peripheral surface 18 with respect to the covering outer peripheral surface 18 . The parting line PL is arranged at a position shifted from the covering outer peripheral surface 18 .
In this manner, the gate G1 and the parting line PL are shifted from the coated outer peripheral surface 18. FIG. Therefore, burrs generated when the thermoplastic elastomer is filled into the mold from the gate G1, burrs generated by the parting line PL, and the like can be prevented from being generated on the covering outer peripheral surface 18. FIG. This eliminates the need for post-processing to remove burrs from the coated outer peripheral surface 18 .

Here, the slide bearing 10 with the coating layer adheres the first coating layer 14 to the outer peripheral surface 17 of the slide bearing 12 with an adhesive by welding the first coating layer 14 to the outer peripheral surface 17 of the slide bearing 12 . you don't have to. By not interposing an adhesive between the first coating layer 14 and the outer peripheral surface 17 of the slide bearing 12, the following effects can be obtained.
That is, in the case of a small sliding bearing with a coating layer, for example, if the first coating layer is adhered to the outer peripheral surface of the sliding bearing with an adhesive, uneven application of the adhesive will cause the adhesive to spread evenly on the outer peripheral surface of the sliding bearing. It may not be possible to apply to the size. On the other hand, it is conceivable that the thickness dimension of the first coating layer is less than 1.0 mm in the case of a small sliding bearing with a coating layer. In this state, if the adhesive is not applied to the outer peripheral surface of the sliding bearing in a uniform thickness, the hardness of the first coating layer may become uneven.
For this reason, when conveying an object with a small sliding bearing with a first coating layer, or when rolling the first coating layer along a contact object, noise is generated. may occur or cause uneven torque.

In contrast, by welding the first coating layer 14 to the outer peripheral surface 17 of the sliding bearing 12, the adhesive can be made unnecessary. As a result, even if the covered sliding bearing 10 is small and the thickness dimension of the first covering layer 14 is less than 1.0 mm, the hardness of the first covering layer 14 can be kept uniform over the entire circumference. be possible.
As a result, even when the slide bearing 10 with the coating layer is formed in a small size, when conveying an object by the slide bearing 10 with the coating layer, or when rolling the slide bearing 10 with the coating layer along the contact object, It is possible to suppress the occurrence of sound (noise) and the cause of uneven torque.
In addition, although 1st Embodiment demonstrates the example which provides the 1st coating layer 14 to the outer peripheral surface 17 of the sliding bearing 12 only by welding, it does not restrict to this. As another example, the first coating layer 14 may be provided on the outer peripheral surface 17 of the sliding bearing 12 by using an adhesive for welding, for example, depending on the application and material of the slide bearing 10 with the coating layer.

In the first embodiment, an example in which the sliding bearing 12 is made of, for example, hard plastic (amorphous plastic) has been described, but the present invention is not limited to this. As another example, the sliding bearing 12 may be formed by sintering a metal material, for example. A sliding bearing formed by sintering a metal material has a rough bearing surface (surface). The molten thermoplastic elastomer melts into the concave portion of the bearing surface, and the thermoplastic elastomer can be firmly fixed to the bearing surface by an anchor effect.

Here, for example, as shown in Table 1 and FIG. 2, it is possible to incorporate potassium titanate fibers into the thermoplastic elastomer in order to secure the wear amount of the first coating layer 14 .
Table 1 shows the properties of the first coating layer 14 of the present invention containing potassium titanate fibers. FIG. 2 is a graph showing the characteristics when the first coating layer 14 contains potassium titanate fibers.
In Table 1 and FIG. 2, a thermoplastic elastomer (polyester type (TPEE)) containing no potassium titanate fiber is shown as an elastomer (single substance). A thermoplastic elastomer containing 10 wt % potassium titanate fiber is shown as elastomer (10 wt %).
A thermoplastic elastomer containing 20 wt % of potassium titanate fiber is shown as elastomer (20 wt %). A thermoplastic elastomer containing 30 wt % potassium titanate fiber is shown as elastomer (30 wt %).

Table 1 and FIG. 2 show properties of elastomer (single substance), elastomer (10 wt %), elastomer (20 wt %), and elastomer (30 wt %).
The tensile strength can be increased from 12 MPa to 13 MPa, 18 MPa and 23 MPa by adding 10 wt %, 20 wt % and 30 wt % of potassium titanate fiber to the thermoplastic elastomer.
Also, the bending strength can be increased from 4 MPa to 7 MPa, 9 MPa, and 16 MPa. Furthermore, the bending elastic modulus can be increased from 0.05 GPa to 0.13 GPa, 0.21 GPa, and 0.44 GPa.

The graph of FIG. 2 shows the wear amount and duro hardness A of the thermoplastic elastomer alone and the thermoplastic elastomer containing 10 wt %, 20 wt % and 30 wt % of potassium titanate fiber. As shown in FIG. 2 and Table 1, when the thermoplastic elastomer contains 10 wt %, 20 wt %, and 30 wt % of potassium titanate fiber, the duro hardness A of the thermoplastic elastomer is approximately the same as 94 to 96, 97, and 98. can be secured to
Furthermore, as shown in FIG. 2 and Table 1, the amount of abrasion of the thermoplastic elastomer can be reduced when the thermoplastic elastomer contains potassium titanate fibers. Specifically, in the states containing 10 wt%, 20 wt%, and 30 wt% potassium titanate fibers, the amount of wear of the thermoplastic elastomer was reduced from 12.5 × 10 ^-3 cm ³ to 10.1 × 10 ^-3 cm ³ , It can be reduced to 7.0×10 ⁻³ cm ³ and 3.8×10 ⁻³ cm ³ .

Here, the amount of wear of the thermoplastic elastomer is measured by a reciprocating sliding test. As for the reciprocating sliding test conditions, a glass plate is selected as the mating material, and the reciprocating sliding test is performed at a load of 0.7 kg and a speed of 0.16 m/s for 20 minutes.
The content of the potassium titanate fiber is appropriately selected according to the use of the slide bearing 10 with the coated layer.

(First modification)
Next, a plain bearing 20 with a coating layer will be described as a first modified example of the first embodiment with reference to FIG.
FIG. 3 is a cross-sectional view showing a first modification of the slide bearing with a coating layer according to the first embodiment.
As shown in FIG. 3 , the slide bearing 20 with a coating layer can also be configured such that both sides 21 a and 21 b of the slide bearing 21 are filled with grease 24 . Specifically, the sliding bearing 12 has a first concave portion 22 and a second concave portion 23 coaxially formed in both side portions 21a and 21b. As an example, the outer diameter of the first recess 22 is formed smaller than the outer diameter of the second recess 23 .
The first recess 22 is filled with grease 24 and the second recess 23 accommodates a sliding washer 25 . By accommodating the sliding washer 25 in the second recess 23 , the opening of the first recess 22 is closed with the sliding washer 25 . Therefore, it is possible to keep the grease 24 in the first concave portion 22 .

A tubular restricting portion 26 is provided outside the sliding washer 25 . The restricting portion 26 is attached to the support shaft 19 . Therefore, the sliding washer 25 is held in the second concave portion 23 by the restricting portion 26 .
Here, for example, when the restricting portion 26 is made of metal, it is preferable to form the sliding washer 25 from a resin material. By accumulating the grease 24 in the first concave portion 22 , the slide bearing 20 with the coated layer can be rotated more favorably with respect to the support shaft 19 .

(Second modification)
Next, a second modification of the bearing 10 of the first embodiment will be described.
FIG. 4 is a side view showing a second modification of the bearing 10 according to the first embodiment.
As shown in FIG. 4, as the bearing 10 of the first embodiment, an example in which the first coating layer 14 is formed of a thermoplastic elastomer has been described. It is also possible to form a plurality of teeth 28 for the gear. This allows the bearing 10 to be used as the gear 27 . Gear 27 can be used, for example, as a small planetary gear inside a planetary gear mechanism.
The gear 27 has a plurality of teeth 28 made of thermoplastic elastomer. Thereby, it is possible to reduce the driving noise generated when the gears 27 are meshed.
Also, the first coating layer 14 forming the plurality of teeth 28 can be made of a thermoplastic elastomer having a duro hardness A exceeding 95 in consideration of wear resistance and mechanical strength of the gear 27 .

Next, an example of application of the slide bearing 10 with the coating layer of the first embodiment will be described with reference to FIG. 5 . FIG. 5 is a side view showing the moving body 1 provided with the covered sliding bearing 10 according to the first embodiment.
As shown in FIG. 5, for example, a slide bearing 10 with a coating layer is attached to a moving body (driving module) 1 and used as a wheel.
A moving body 1 includes a main body 2 and a plurality of covered slide bearings 10 attached to both sides of the main body 2 . A slide bearing 12 is rotatably supported by a support shaft 3 in a plurality of coated slide bearings 10 .
The support shaft 3 is attached to the body portion 2 . By fixing the slide bearing 12 to the support shaft 3 , the coated slide bearing 10 is rotatably supported by the support shaft 3 . That is, the slide bearing 10 with a plurality of covering layers is used as a wheel.

The moving body 1 is arranged in a state in which the first coating layers 14 (specifically, the coated outer peripheral surfaces 18 ) of the slide bearings 10 with a plurality of coated layers are in contact with the contact 5 . The moving body 1 can be moved along the contact object 5 by rolling the sliding bearing 10 with the coating layer on the contact object 5 .
Since the sliding bearing 10 with the covering layer is provided with the first covering layer 14, the noise is reduced by the first covering layer 14 when the sliding bearing 10 with the covering layer moves while rolling on the contact 5. can be made
Moreover, since the first coating layer 14 is firmly engaged with the outer peripheral surface 17 of the sliding bearing 12 , the first coating layer 14 can be prevented from falling off from the outer peripheral surface 17 of the sliding bearing 12 .
Thus, by providing the sliding bearing 10 with a plurality of coated layers in the moving body 1, it is possible to secure the durability and obtain the moving body 1 at a low cost.

In FIG. 5, an example in which the first coating layer 14 of the slide bearing 10 with a coating layer is rotated while being in contact with the contact 5 and the moving body 1 is moved along the contact 5 has been described. is not limited to As another example, the movable body 1 may be held in a fixed state, the first coating layer 14 may be brought into contact with the contact object 5, and the contact object 5 may be moved by rotating the first coating layer 14. FIG. In this case, the drawer of a desk corresponds to the contact object 5 .
Further, as another example, the slide bearing 10 with a coating layer may be applied to a universal wheel that turns in the running direction. By applying the slide bearing 10 with the coating layer to the swivel wheel, the slide bearing 10 with the coating layer can be turned in correspondence with the running direction of the moving body 1 .

Furthermore, as another application example, the slide bearing 10 with a coating layer is used in a transport device (drive module) for banknotes, tickets, and the like. That is, in the conveying device, the slide bearings 12 of the pair of coated slide bearings 10 are attached to the support shaft 3, and the slide bearings 12 and the first coated layer 14 are rotatably supported by the support shaft. A pair of first coating layers 14 are arranged adjacent to each other. In this state, by rotating the plain bearing 10 with the coating layer, a banknote, a ticket, etc. is sandwiched between the pair of the first coating layers 14 and conveyed.

Since the first coating layer 14 is formed on the sliding bearing 12 , when conveying bills, tickets, etc. while sandwiching them between the first coating layers 14 of the sliding bearing 10 with the coating layer, the first coating layer 14 can reduce sound (noise). Moreover, since the first coating layer 14 is firmly engaged with the sliding bearing 12 , the first coating layer 14 can be prevented from falling off from the outer peripheral surface 17 of the sliding bearing 12 .
Thus, by providing the slide bearing 10 with the coating layer in the conveying device, durability can be ensured and a low-cost conveying device can be obtained.

Next, slide bearings according to second to fifth embodiments will be described with reference to FIGS. 6 to 9. FIG. In the slide bearings of the second to fourth embodiments, the same or similar members as those of the coated slide bearing 10 of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

(Second embodiment)
FIG. 6 is a cross-sectional view of a plain bearing 30 with a coating layer according to the second embodiment.
As shown in FIG. 6 , the coated slide bearing 30 includes a slide bearing 32 , a second coated layer 36 and a first coated layer 14 . The slide bearing 32 , the second coating layer 36 , and the first coating layer 34 are formed coaxially with the axis O of the slide bearing 32 .
That is, the second coating layer 36 is interposed between the plain bearing 32 and the first coating layer 34 .

The sliding bearing 32 has a cylindrical bearing surface 41 and an outer peripheral portion 42 . The bearing surface 41 is formed in an arc shape on the inner peripheral surface of the slide bearing 32 and is rotatably fitted to the support shaft 19 . The slide bearing 32 is rotatably supported around the support shaft 19 .

The outer peripheral portion 42 of the sliding bearing 32 has a bearing convex portion 43 , a first bearing outer peripheral surface 44 and a second bearing outer peripheral surface 45 . The bearing protrusion 43 protrudes (expands) radially outward of the sliding bearing 32 from the center of the outer peripheral portion 42 in the direction of the axis O. As shown in FIG. The bearing projection 43 has a bearing outer peripheral surface 43a, a first bearing side surface 43b, and a second bearing side surface 43c.
The bearing outer peripheral surface 43a is formed on the radially outer side of the slide bearing 32 in the bearing convex portion 43 . The bearing outer peripheral surface 43 a is formed on one end side of the bearing protrusion 43 . The second bearing side surface 43 c is formed on the other end side of the bearing protrusion 43 .

The slide bearing 32 is formed of hard plastic (amorphous plastic), for example, as plastic, like the slide bearing 12 of the first embodiment. Preferred amorphous plastics include polycarbonate, ABS resin, and alloys of polycarbonate and ABS resin.
By forming the slide bearing 32 from, for example, hard plastic, the wear resistance of the bearing surface 41 against the support shaft 19 can be ensured.
A solid lubricant such as polytetrafluoroethylene (tetrafluoroethylene, PTFE) is preferably added to this hard plastic.
A second coating layer 36 is insert-molded (two-color molding) on the outer peripheral portion 42 of the slide bearing 32 by injection molding.

The second coating layer 36 is injection molded (two-color molding) with a thermoplastic elastomer (TPE) on the outer peripheral portion 42 of the slide bearing 32 . The thermoplastic elastomer has excellent heat-sealing properties with the amorphous plastic that is the material of the slide bearing 32 . Here, polyester-based (TPEE) is preferable as the thermoplastic elastomer of the second coating layer 36 . Polyester-based materials are excellent in wear resistance and mechanical strength, and are excellent in heat-sealing properties with hard plastics (that is, slide bearing 32). Therefore, the effect is exhibited at the time of two-color molding. In addition, polyester (TPEE) has low hygroscopicity and good moldability, so it is most suitable as a material for the second coating layer 36 of the slide bearing 10 with a coating layer.

Here, the second coating layer 36 is interposed between the plain bearing 32 and the first coating layer 34 . Therefore, for the second coating layer 36 , a material is selected that has excellent heat-sealing properties with respect to both the slide bearing 32 and the first coating layer 34 . As a result, the first coating layer 34 is firmly fixed to the outer peripheral portion 42 of the slide bearing 32 via the second coating layer 36 by heat-sealing.
Further, the slide bearing 32 has a bearing convex portion 43 formed on an outer peripheral portion 42 . Therefore, the inner peripheral surface 47 of the second coating layer 36 and the outer peripheral portion 42 of the slide bearing 32 are engaged in an uneven manner. As a result, when a force is applied to the second coating layer 36 , the unevenness between the inner peripheral surface 47 of the second coating layer 36 and the outer peripheral portion 42 of the sliding bearing 32 causes the second coating layer 36 to move the sliding bearing 32 . can be prevented from coming off the outer peripheral portion 42 of the .

The second coating layer 36 is formed in a cylindrical shape and has a coating outer peripheral portion 51 . The covering outer peripheral portion 51 has a covering convex portion 52 , a first covering outer peripheral surface 53 , and a second covering outer peripheral surface 54 . The covering convex portion 52 protrudes radially outward of the slide bearing 32 from the center of the covering outer peripheral portion 51 in the direction of the axis O. As shown in FIG. The covering projection 52 has a covering outer peripheral surface 52a, a first covering side surface 52b, and a second covering side surface 52c.
The coated outer peripheral surface 52 a is formed on the radially outer side of the slide bearing 32 in the coated convex portion 52 . The first covering side surface 52 b is formed on one end side of the covering projection 52 . The second covering side surface 52 c is formed on the other end side of the covering projection 52 .

The first coating layer 34 is heat-sealed to the coating outer peripheral portion 51 of the second coating layer 36 . The first coating layer 34 is formed in a cylindrical shape on the coating outer peripheral portion 51 of the second coating layer 36 . The first coating layer 34 is injection-molded (two-color molding) with a thermoplastic elastomer (TPE) on the outer peripheral portion 51 of the second coating layer 36 .
The thermoplastic elastomer of the first coating layer 34 is preferably polyester-based (TPEE), similarly to the second coating layer 36 .

Since the first coating layer 34 is made of a thermoplastic elastomer like the second coating layer 36, the heat-sealing property between the first coating layer 34 and the second coating layer 36 is enhanced. . In addition, for the second coating layer 36, a material having excellent heat-sealing properties with respect to the first coating layer 34 is selected. Therefore, the first coating layer 34 is firmly fixed to the coating outer peripheral portion 51 of the second coating layer 36 by thermal fusion.

Further, a covering convex portion 52 is formed on the covering outer peripheral portion 51 of the second covering layer 36 . Therefore, the inner peripheral surface 56 of the first coating layer 34 and the outer peripheral coating portion 51 of the second coating layer 36 are engaged in an uneven manner. As a result, when a force is applied to the first coating layer 34 , the first coating layer 34 is bent by the unevenness between the inner peripheral surface 56 of the first coating layer 34 and the outer peripheral coating portion 51 of the second coating layer 36 . can be prevented from peeling off from the covering outer peripheral portion 51 of the second covering layer 36 . Thereby, it is possible to reliably prevent the first coating layer 34 from falling off from the coating outer peripheral portion 51 of the second coating layer 36 .
As described above, the second coating layer 36 is made of a material that is excellent in heat-sealing properties to both the slide bearing 32 and the first coating layer 34 . Thereby, the first coating layer 34 is firmly fixed to the outer peripheral portion 42 of the sliding bearing 32 via the second coating layer 36 .

Here, the second coating layer 36 is made of a material softer than the slide bearing 32 . Also, the first coating layer 34 is made of a harder material than the second coating layer 36 .
A soft material refers to a material having a small flexural modulus and hardness (for example, duro hardness A (durometer hardness A)).
A hard material refers to a material having a high flexural modulus and hardness (for example, duro hardness A (durometer hardness A)).

Thus, the second coating layer 36 is made of a softer material than the slide bearing 32. As shown in FIG. Furthermore, the first coating layer 34 is made of a harder material than the second coating layer 36 . By forming the first coating layer 34 with a harder material than the second coating layer 36, the wear resistance and durability of the first coating layer 34 can be ensured.
On the other hand, by forming the second coating layer 36 with a material that is softer than the slide bearing 32 and the first coating layer 34, when the slide bearing 30 with the coating layer is driven, the second coating layer 36 can generate noise. (noise) can be suppressed, and sound (noise) can be reduced.

In addition, in the second embodiment, an example in which the sliding bearing 32 is made of, for example, hard plastic (amorphous plastic) has been described, but the present invention is not limited to this. As another example, the slide bearing 32 may be formed by sintering a metal material, for example. A sliding bearing formed by sintering a metal material has a rough bearing surface (surface). The molten thermoplastic elastomer melts into the concave portion of the bearing surface, and the thermoplastic elastomer can be firmly fixed to the bearing surface by an anchor effect.

Also, the slide bearing 32 may be made of a material with excellent sliding properties, such as a crystalline material such as polyacetal (POM) or polyamide (PA), and a material with excellent self-lubricating properties. Such materials have poor heat-sealability with thermoplastic elastomers. However, by using an amorphous material excellent in heat-sealability with the thermoplastic elastomer for the second coating layer 36, the first coating layer 34 and the second coating layer 36 can be firmly fixed. can.

Moreover, since both the slide bearing 32 and the second coating layer 36 are made of plastic, they are generally well welded to each other. By the way, it is conceivable that the welding between the slide bearing 32 and the second coating layer 36 is not successful. Even in this case, both the slide bearing 32 and the second coating layer 36 are harder than the thermoplastic elastomer, and the second coating layer 36 shrinks radially inward after molding to closely adhere to the slide bearing 32. . Thereby, the second covering layer 36 is fixed to the sliding bearing 32 by the mutual frictional force between the sliding bearing 32 and the second covering layer 36 .

According to the coated slide bearing 30 of the second embodiment, the first coated layer 34 is firmly fixed to the outer peripheral portion 42 of the slide bearing 32 via the second coated layer 36 . Therefore, a sandblasting process and an adhesive coating process, which have conventionally been required, can be eliminated. Thereby, the slide bearing 30 with a coating layer can be mass-produced at low cost.

(Third embodiment)
FIG. 7 is a cross-sectional view of a plain bearing 60 with a coating layer according to the third embodiment. In addition, in the sliding bearing 60 with the coating layer of the third embodiment, the same or similar members as those of the sliding bearing 30 with the coating layer of the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
As shown in FIG. 7, a slide bearing 60 with a coating layer replaces the slide bearing 32 and the second coating layer 36 of the second embodiment with a slide bearing 62 and a second coating layer 66, and has other configurations. are the same as those of the slide bearing 30 with the coating layer of the second embodiment. A slide bearing 62 is obtained by replacing the bearing protrusion 43 of the second embodiment with a bearing protrusion 63 .

The bearing protrusion 63 has a bearing outer peripheral surface 63a, a first bearing side surface 63b, and a second bearing side surface 63c. The first bearing side surface 63b extends from one end 44a of the first bearing outer peripheral surface 44 to one end 63d of the first outer peripheral surface 63a at an inclination angle of θ1 from the center side of the sliding bearing 62 in the direction of the axis O toward the outside. ing. The second bearing side surface 63c is inclined at an angle of inclination θ1 outward from the center side in the direction of the axis O of the sliding bearing 62 from one end 45a of the second bearing outer peripheral surface 45 to the other end 63e of the first outer peripheral surface 63a. extended.
The inclination angle θ1 of the first bearing side surface 63b and the second bearing side surface 63c is set to less than 90 degrees. That is, the bearing convex portion 63 is formed such that the width dimension W1 gradually increases from the slide bearing 62 toward the outside in the radial direction.

The second covering layer 66 has a first side layer 66a and a second side layer 66b. The first side layer 66a is formed in an inclined shape so as to come into contact with the first bearing side surface 63b. The second side layer 66b is formed in an inclined shape so as to come into contact with the second bearing side surface 63c.
Therefore, when the second coating layer 66 shrinks due to cooling, the first side layer 66a can be suitably bitten into the first bearing side surface 63b. Also, the second side layer 66b can be suitably bitten into the second bearing side surface 63c. Thereby, the second coating layer 66 is more firmly fixed to the bearing projection 63 (that is, the slide bearing 62).

Further, in the second coating layer 66, similarly to the bearing protrusion 63, the first coating side surface 65b and the second coating side surface 65c of the coating protrusion 65 are formed in an inclined shape.
Therefore, when the first covering layer 64 shrinks due to cooling, the first side layer 64a can be suitably bitten into the first covering side surface 65b. Moreover, the second side layer 64b can be suitably bitten into the second covered side surface 65c. As a result, the first covering layer 64 is more firmly fixed to the covering projections 65 (that is, the second covering layer 66).
In addition, even when a force in the direction of the axis O or a force in a direction in which the second coating layer 66 is turned over is applied to the first coating layer 64, the first coating layer 64 is peeled off from the second coating layer 66. It can be difficult.

In addition, in the slide bearing 60 with the covering layer according to the third embodiment, the first bearing side surface 63b and the second bearing side surface 63c of the bearing convex portion 63 are formed to be inclined, and the first covering side surface 65b of the covering convex portion 65 is inclined. , an example in which the second covering side surface 65c is formed in an inclined shape has been described, but the present invention is not limited to this. As another example, only one of the bearing convex portion 63 and the covering convex portion 65 may be formed in an inclined shape. In particular, by forming only the covering protrusions 65 in a slanted shape, the first covering layer 64 is less likely to peel off from the second covering layer 66, which is preferable.

(Fourth embodiment)
FIG. 8 is a cross-sectional view of a plain bearing 70 with a coating layer according to a fourth embodiment.
As shown in FIG. 8 , the coated slide bearing 70 includes a slide bearing 72 , a second coated layer 76 and a first coated layer 74 . The slide bearing 72 , the second coating layer 76 , and the first coating layer 74 are formed coaxially with the axis O of the slide bearing 72 .
That is, a second coating layer 76 is interposed between the plain bearing 72 and the first coating layer 74 .
The sliding bearing 72 is made of hard plastic (amorphous plastic), for example, plastic, like the sliding bearing 12 of the first embodiment. Preferred amorphous plastics include polycarbonate, ABS resin, and alloys of polycarbonate and ABS resin.
By forming the slide bearing 72 from hard plastic, for example, the wear resistance of the bearing surface 81 against the support shaft 19 can be ensured.
A solid lubricant such as polytetrafluoroethylene (tetrafluoroethylene, PTFE) is preferably added to this hard plastic.

A second coating layer 76 is formed on the outer peripheral surface 82 , the first side surface 83 and the second side surface 84 of the sliding bearing 72 . The second coating layer 76 is heat-sealed to the outer peripheral surface 82, the first side surface 83, and the second side surface 84 of the sliding bearing 72 by insert molding using injection molding.

As with the second coating layer 36, the second coating layer 76 is injection molded (two-color molding) on the outer peripheral surface 82, the first side surface 83, and the second side surface 84 of the sliding bearing 72 with a thermoplastic elastomer (TPE). ). The thermoplastic elastomer has excellent heat-sealing properties with the amorphous plastic that is the material of the slide bearing 72 . Here, polyester-based (TPEE) is preferable as the thermoplastic elastomer of the second coating layer 36 . Polyester-based materials are excellent in wear resistance and mechanical strength, and are excellent in heat-sealing properties with hard plastics (that is, slide bearing 32). Therefore, the effect is exhibited at the time of two-color molding. In addition, polyester (TPEE) has low hygroscopicity and good moldability, so it is most suitable as a material for the second coating layer 76 of the slide bearing 70 with a coating layer.

Here, the second coating layer 76 is interposed between the plain bearing 72 and the first coating layer 74 . Therefore, for the second coating layer 76 , a material is selected that has excellent heat-sealing properties with respect to both the slide bearing 72 and the first coating layer 74 . As a result, the first coating layer 74 is firmly fixed to the outer peripheral surface 82, the first side surface 83, and the second side surface 84 of the slide bearing 72 via the second coating layer 36 by thermal fusion.

The second coating layer 76 has a first wall portion 86 and a second wall portion 87 . The first wall portion 86 is heat-sealed to a portion of the first side surface 83 of the sliding bearing 72 . The second wall portion 87 is heat-sealed to a portion of the second side surface 84 of the slide bearing 72 . Therefore, the second coating layer 76 and the sliding bearing 72 are engaged in an uneven manner. This prevents the second coating layer 76 from coming off the slide bearing 72 due to unevenness between the second coating layer 76 and the sliding bearing 72 when a force is applied to the second coating layer 76 .

The second coating layer 76 is formed in a cylindrical shape and has a coating outer peripheral portion 91 . The covering outer peripheral portion 91 has a covering convex portion 92, a first covering outer peripheral surface 93, and a second covering outer peripheral surface 94, like the covering outer peripheral portion 51 of the second embodiment. The covering convex portion 92 protrudes (expands) from the center of the covering outer peripheral portion 91 in the direction of the axis O to the radially outer side of the slide bearing 72 . The covering projection 92 has a covering outer peripheral surface 92a, a first covering side surface 92b, and a second covering side surface 92c.

The first coating layer 74 is heat-sealed to the coating outer peripheral portion 91 of the second coating layer 76 . The first coating layer 74 is formed in a cylindrical shape on the coating outer peripheral portion 91 of the second coating layer 76 . The first coating layer 74 is injection molded (two-color molding) with a thermoplastic elastomer (TPE) on the outer peripheral portion 91 of the second coating layer 76 .
The thermoplastic elastomer of the first coating layer 34 is preferably polyester-based (TPEE), similarly to the second coating layer 76 .

Since the first coating layer 74 is made of a thermoplastic elastomer like the second coating layer 36, the heat-sealing property between the first coating layer 74 and the second coating layer 76 is enhanced. . In addition, for the second coating layer 76, a material having excellent heat-sealing properties with respect to the first coating layer 74 is selected. Therefore, the first coating layer 74 is firmly fixed to the coating outer peripheral portion 91 of the second coating layer 76 by thermal fusion.

Further, a covering convex portion 92 is formed on a covering outer peripheral portion 91 of the second covering layer 76 . Therefore, the inner peripheral surface 96 of the first coating layer 74 and the outer peripheral coating portion 91 of the second coating layer 76 are engaged with each other in an uneven manner. As a result, when a force is applied to the first coating layer 74 , the unevenness between the inner peripheral surface 96 of the first coating layer 74 and the outer peripheral coating portion 91 of the second coating layer 76 causes the first coating layer 74 to move. can be prevented from peeling off from the covering outer peripheral portion 91 of the second covering layer 76 . Thereby, it is possible to reliably prevent the first coating layer 74 from falling off from the coating outer peripheral portion 91 of the second coating layer 76 .
As described above, for the second coating layer 76 , a material is selected that has excellent heat-sealing properties with respect to both the slide bearing 72 and the first coating layer 74 . Thereby, the first coating layer 74 is firmly fixed to the plain bearing 72 via the second coating layer 76 .

Here, the second coating layer 76 is made of a softer material than the sliding bearing 72 . Also, the first coating layer 74 is made of a harder material than the second coating layer 76 .
A soft material refers to a material having a small flexural modulus and hardness (for example, duro hardness A (durometer hardness A)).
A hard material refers to a material having a high flexural modulus and hardness (for example, duro hardness A (durometer hardness A)).

Thus, the second coating layer 76 is made of a softer material than the slide bearing 72. As shown in FIG. Furthermore, the first coating layer 74 is made of a harder material than the second coating layer 76 . By forming the first coating layer 74 with a harder material than the second coating layer 76, the wear resistance and durability of the first coating layer 74 can be ensured.
On the other hand, by forming the second coating layer 76 with a material that is softer than the slide bearing 72 and the first coating layer 74, when the slide bearing 70 with the coating layer is driven, the second coating layer 76 generates noise. (noise) can be suppressed, and sound (noise) can be reduced.

Note that in the fourth embodiment, an example in which the slide bearing 72 is made of, for example, hard plastic (amorphous plastic) has been described, but the present invention is not limited to this. As another example, the slide bearing 72 may be formed by sintering a metal material, for example. A sliding bearing formed by sintering a metal material has a rough bearing surface (surface). The molten thermoplastic elastomer melts into the concave portion of the bearing surface, and the thermoplastic elastomer can be firmly fixed to the bearing surface by an anchor effect.

Also, the slide bearing 72 may be made of a material with excellent sliding properties, such as a crystalline material such as polyacetal (POM) or polyamide (PA), and a material with excellent self-lubricating properties. Such materials have poor heat-sealability with thermoplastic elastomers. However, by using an amorphous material excellent in heat-sealability with the thermoplastic elastomer for the second coating layer 76, the first coating layer 74 and the second coating layer 76 can be firmly fixed. can.
Moreover, since both the slide bearing 72 and the second coating layer 76 are made of plastic, they are generally well welded to each other. By the way, it is conceivable that the welding between the slide bearing 72 and the second coating layer 76 is not successful. Even in this case, both the slide bearing 72 and the second coating layer 76 are harder than the thermoplastic elastomer, and the second coating layer 76 shrinks radially inward after molding to closely adhere to the slide bearing 72. . Thereby, the second covering layer 76 is fixed to the sliding bearing 72 by the mutual frictional force between the sliding bearing 72 and the second covering layer 76 .

According to the cover layer provided slide bearing 70 of the fourth embodiment, the first cover layer 74 is firmly fixed to the slide bearing 72 via the second cover layer 76 . Therefore, a sandblasting process and an adhesive coating process, which have conventionally been required, can be eliminated. As a result, the coated slide bearing 70 can be mass-produced at low cost.

(Fifth embodiment)
FIG. 9 is a cross-sectional view of a plain bearing 100 with a coating layer according to a fifth embodiment.
As shown in FIG. 9, a sliding bearing 100 with a coating layer is obtained by replacing the first coating layer 14 of the first embodiment with a first coating layer 104, and the rest of the configuration is the coating layer of the first embodiment. It is the same as the sliding bearing 10 with The first coating layer 104 is obtained by replacing the coating outer peripheral surface 18 of the first embodiment with a coating outer peripheral surface 106 .
The coated outer peripheral surface 106 has a first end 106a and a second end 106b. The first end portion 106a is an end portion where the first covering side surface 104a and the covering outer peripheral surface 106 intersect. The second end 106b is an end where the second covering side surface 104b and the covering outer peripheral surface 106 intersect. The coated outer peripheral surface 106 is formed in a curved shape so that the outer diameter gradually decreases from the first end portion 106a to the second end portion 106b. The coated outer peripheral surface 106 may be formed linearly so that the outer diameter gradually decreases.

A mold parting line PL is positioned at the first end 106a. That is, the covering outer peripheral surface 106 is formed in a curved shape so that the outer diameter gradually decreases from the parting line PL to the second end portion 106b. Therefore, by opening the movable die of the mold in the direction of the arrow after the first coating layer 104 is insert-molded, it is possible to suppress the occurrence of burrs on the outer peripheral surface 106 of the coating.
As a result, after the first coating layer 104 is insert-molded on the outer peripheral surface 17 of the slide bearing 12, post-processing for removing burrs from the coated outer peripheral surface 106 can be made unnecessary.

The outer diameter of the coated outer peripheral surface 106 is formed to gradually decrease. Therefore, when the coated outer peripheral surface 106 conveys banknotes, tickets, etc., or when the coated outer peripheral surface 106 moves while rolling on the contacting object 5 (see FIG. 5), the contact area with the banknotes, tickets, contacting object 5, etc. is reduced. can be suppressed. As a result, when bills, tickets, or the like are conveyed on the coated outer peripheral surface 106 or when the coated outer peripheral surface 106 moves while rolling on the contact object 5, an effect of reducing noise can be obtained.

According to the coated slide bearing 100 of the fifth embodiment, the first coated layer 104 is firmly fixed to the slide bearing 12 by thermal fusion, as in the coated slide bearing 10 of the first embodiment. there is Therefore, a sandblasting process and an adhesive coating process, which have conventionally been required, can be eliminated. Thereby, the plain bearing 100 with a coating layer can be cheaply manufactured in large quantities.

(Modification)
FIG. 10 is a cross-sectional view of a bearing according to a modification of the invention.
As shown in FIG. 10, it is also possible to form the first covering layer 34 of the sliding bearing 30 with a covering layer from a thermoplastic elastomer filled from a gate G2 having a large gate diameter D1.
The gate G2 is opened with a gate diameter D1 larger than the thickness T2 of the first coating layer 34 in the radial direction of the slide bearing 30 with the coating layer. Further, the gate G2 is arranged to axially overlap both the second covering layer 36 and the first covering layer 34 .
By filling the inside (cavity) of the mold from the gate G2 with a thermoplastic elastomer, the first covering layer 34 is insert-molded on the outer covering portion 51 of the second covering layer 36 .

The gate diameter D1 of the gate G2 is formed large, and the gate G2 is arranged so as to overlap both the second covering layer 36 and the first covering layer 34, thereby reducing the thickness of the first covering layer 34. Even if the dimension T2 is made small, the first coating layer 34 can be molded well.
Furthermore, the outer peripheral portion 51 of the second coating layer 36 can be filled with the thermoplastic elastomer under high pressure. Thereby, the adhesion between the second coating layer 36 and the first coating layer 34 can be enhanced.

In the modified example, an example in which the first coating layer 34 of the slide bearing 30 with a coating layer is formed using the gate G2 having a large gate diameter D1 has been described, but the present invention is not limited to this. As another example, a gate G2 having a large gate diameter D1 may be used to form the first coating layers 64 and 74 of the slide bearings 60 and 70 with coating layers, for example.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
In the first to fifth embodiments, examples were described in which the width dimension of the coating layers 14, 34, 36, 66, 64, 76, 74, 104 was set to be the same as the width dimension of the slide bearing 12. , but not limited to this. As another example, the width dimension of the coating layers 14 , 34 , 36 , 66 , 64 , 76 , 74 , 104 may be set smaller than that of the sliding bearing 12 . Hereinafter, the coating layers 14, 34, 36, 66, 64, 76, 74, 104 are abbreviated as "coating layers 14...".
By reducing the width dimension of the coating layers 14, the amount of material used for forming the coating layers 14 can be reduced, and by reducing the contact area of the outer peripheral surfaces of the coating layers 14, noise can be reduced. be able to.

Further, in the first embodiment to the fifth embodiment, the outer peripheral surfaces 17 and 87 of the sliding bearings 12 and 72, the outer peripheral portions 42 of the sliding bearings 32 and 62, the coating outer circumferences of the second coating layers 36, 66 and 76 Grooves or creases may be formed in the portions 51,91. The groove is formed, for example, so as to extend in the axial direction of the sliding bearing. The bonding strength of the coating layer to the outer peripheral surfaces 17, 87, the outer peripheral portion 42, and the outer peripheral portions 51, 91 is increased by forming grooves and creases in the outer peripheral surfaces 17, 87, the outer peripheral portion 42, and the outer peripheral portions 51, 91. can increase

Furthermore, in the second embodiment to the fifth embodiment, as in the modification of the first embodiment, the first recesses are formed on both sides of the slide bearings 32, 62, 72, and the first recesses are It is good also as a structure which stores grease.

1……Moving body (driving module)
DESCRIPTION OF SYMBOLS 10, 30, 60, 70, 100... Slide bearing with coating layer 12, 32, 62, 72... Slide bearing 14, 34, 64, 74, 104... First coating layer 16, 41, 81... Bearing surface 17, 82... Peripheral surface 36, 66, 76... Second coating layer 42... Peripheral part (peripheral surface)
43 ... Bearing convex part (convex part)
91 ... Coating outer peripheral portion (outer peripheral surface)
92... Coating convex portion (convex portion)

Claims (5)

a sliding bearing having a cylindrical bearing surface;
a first covering layer formed coaxially with the axis of the sliding bearing on the radially outer side of the sliding bearing and injection-molded with a thermoplastic elastomer;
a second coating layer interposed between the outer peripheral surface of the sliding bearing and the first coating layer;
with
The second coating layer is
made of a material softer than the sliding bearing,
The first coating layer is
made of a material harder than the second coating layer,
A sliding bearing with a covering layer characterized by: The slide bearing is
Made of polycarbonate, ABS resin, or alloy plastic of polycarbonate and ABS resin,
The sliding bearing with a covering layer according to claim 1, characterized in that: One of the outer peripheral surfaces of the sliding bearing on which the first coating layer is formed and the second coating layer has a convex portion that protrudes radially outward at the center in the axial direction. 3. A slide bearing with a covering layer according to claim 1 or 2 . The first coating layer is formed of a thermoplastic elastomer filled from the gate,
The gate is formed in an opening larger than the thickness dimension of the first coating layer, which is the distance between the outermost periphery on the inner peripheral surface of the first coating layer and the outermost periphery on the outer peripheral surface of the first coating layer. 4. A sliding bearing with a covering layer according to claim 3 , wherein the sliding bearing is arranged so as to overlap both the covering layer and the second covering layer in the axial direction. A drive module comprising the coated slide bearing according to any one of claims 1 to 4 .

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