JP2022066163A - Supporting structure for sliding member - Google Patents

Abstract

To provide a supporting structure for a sliding member that can sufficiently reduce sliding resistance of a receiving surface of a receiving member, and can enhance weather resistance.SOLUTION: In a supporting structure 1A for a sliding member, a thrust load of the sliding member (coil spring 3) is received by a receiving surface 4a of a receiving member 4A. An annular first thrust sheet 11 in contact with the sliding member, and an annular second thrust sheet 12 in contact with the receiving surface are interposed between the sliding member and the receiving member. The first thrust sheet is formed of polyacetal resin. The second thrust sheet is formed of fluororesin.SELECTED DRAWING: Figure 1

Description

The present invention relates to a support structure for a sliding member, and more particularly to a support structure for a sliding member that receives a thrust load of the sliding member and receives it on a receiving surface of the member.

As a conventional spring support structure, a structure that receives the thrust load of a coil spring and receives it on the receiving surface of a member is generally known (see, for example, Patent Document 1 and the like). Patent Document 1 discloses a support structure in which a thrust bearing is interposed between an end portion of a coil spring and a receiving member (upper case). In this support structure, the thrust bearing effectively reduces the sliding resistance of the receiving surface of the receiving member due to the vertical movement of the coil spring.

However, since the spring support structure of Patent Document 1 uses a thrust bearing, it is strictly forbidden to allow water to enter the case or dust to enter, and floating rust is likely to occur due to contact with dissimilar metals, resulting in weather resistance. low. In addition, maintenance is low because regular overhaul work is required. Furthermore, since a thrust bearing is prepared and a case dedicated to the thrust bearing is required, the production cost is high.

Therefore, in order to solve the above-mentioned problems, a technique has been proposed in which a resin sheet or a metal plate is interposed between the end portion of the coil spring and the receiving member. However, the proposed technique cannot sufficiently reduce the sliding resistance of the receiving surface of the receiving member as compared with the thrust bearing. Further, when a Duracon sheet is used as the resin sheet, for example, the water resistance is high, but the friction coefficient may increase due to the infiltration of dust, and the weather resistance cannot be improved. Further, when a stainless steel plate is used as the metal plate, for example, floating rust is likely to occur due to contact of dissimilar metals with the stainless steel plate, and the friction coefficient is significantly increased due to the infiltration of dust, so that the weather resistance can be improved. Can not.

In addition to the spring support structure, the above-mentioned problem also occurs in a support structure that receives a thrust load such as a rotating body and receives it on the receiving surface of the member.

Japanese Unexamined Patent Publication No. 2018-40490

The present invention has been made in view of the above-mentioned current situation, and provides a support structure for a sliding member capable of sufficiently reducing the sliding resistance of the receiving surface of the receiving member and enhancing the weather resistance. The purpose.

The present inventor has found that the sliding resistance of the receiving surface cannot be sufficiently reduced even if a thrust sheet made of a resin material having excellent self-lubricating properties and the same physical properties is combined, while the polyacetal resin having excellent self-lubricating properties is excellent. By combining the first thrust sheet made of the same material and the second thrust sheet made of a fluororesin having excellent self-lubricating property and having a smaller hardness and friction coefficient than the polyacetal resin, the sliding resistance of the receiving surface can be sufficiently reduced. This led to the completion of the present invention.

In order to solve the above problems, the invention according to claim 1 is a support structure for a sliding member that receives the thrust load of the sliding member on the receiving surface of the member, and the sliding member and the receiving member. An annular first thrust sheet in contact with the sliding member and an annular second thrust sheet in contact with the receiving surface are interposed between the first thrust sheet, and the first thrust sheet is formed of a polyacetal resin. The gist is that the second thrust sheet is made of a fluororesin.
The gist of the invention according to claim 2 is that the first thrust sheet and the second thrust sheet are in contact with each other in the invention according to claim 1.
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the sliding member is a coil spring or an elastic member arranged in contact with the shaft end portion of the coil spring. Is the gist.
The invention according to claim 4 is the invention according to claim 1 or 2, wherein the sliding member is a rotating body rotatably supported by the receiving member.
The invention according to claim 5 is the invention according to claim 1 or 2, wherein the sliding member is a filler bolt screwed into the receiving member.
The invention according to claim 6 is characterized in that, in the invention according to claim 1 or 2, the sliding member is a connecting body connected to the tubular receiving member.
The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the first thrust sheet and the convex shape that can be inserted into the inside of the second thrust sheet are formed on the receiving surface. The gist is that the portion is raised and the inner diameter of the first thrust sheet is larger than the inner diameter of the second thrust sheet.
The gist of the invention according to claim 8 is that the invention according to any one of claims 1 to 3 is used for a suspension of a vehicle.

According to the support structure of the sliding member of the present invention, an annular first thrust sheet in contact with the sliding member and an annular second thrust sheet in contact with the receiving surface are interposed between the sliding member and the receiving member. The first thrust sheet is made of a polyacetal resin, and the second thrust sheet is made of a fluororesin. As described above, since the first thrust sheet made of a polyacetal resin having excellent self-lubricating property and the second thrust sheet made of a fluororesin having excellent self-lubricating property and having a smaller hardness and friction coefficient than the polyacetal resin are combined. , The sliding resistance of the receiving surface of the receiving member by the sliding member can be sufficiently reduced to improve the durability. Further, since the water resistance is high and it is difficult for dust and the like to infiltrate, the weather resistance can be improved. Further, as compared with the conventional support structure having a thrust bearing, the maintainability is excellent and the production cost can be reduced.
Further, when the first thrust sheet and the second thrust sheet are in contact with each other, the sliding resistance of the receiving surface can be further reduced.
Further, when the sliding member is a coil spring or an elastic member arranged in contact with the shaft end of the coil spring, the sliding resistance of the receiving surface of the receiving member due to the expansion and contraction of the coil spring is sufficient. Can be reduced to.
Further, when the sliding member is a rotating body rotatably supported by the receiving member, the sliding resistance of the receiving surface of the receiving member by the rotating body can be sufficiently reduced.
Further, when the sliding member is a filler bolt screwed into the receiving member, the sliding resistance of the receiving surface of the receiving member by the filler bolt can be sufficiently reduced.
Further, when the sliding member is a connecting body connected to the tubular receiving member, the sliding resistance of the receiving surface of the receiving member by the connecting body can be sufficiently reduced.
Further, when the convex portion is raised on the receiving surface and the inner diameter of the first thrust sheet is larger than the inner diameter of the second thrust sheet, the inner circumference of the relatively hard first thrust sheet is obtained. A gap is formed between the surface and the convex portion of the receiving member. Therefore, even if the sliding member is shaken, the first thrust sheet can smoothly rotate and reduce the sliding resistance.
Further, when used for the suspension of a vehicle, the running performance of the vehicle is enhanced.

The present invention will be further described in the following detailed description with reference to the plurality of references mentioned with reference to non-limiting examples of typical embodiments according to the invention, although similar reference numerals are in the drawings. Similar parts are shown through several figures.
It is sectional drawing of the spring support structure which concerns on Example 1. FIG. It is a perspective view of the 1st and 2nd thrust sheets which concerns on Example 1. FIG. It is a table which shows the test result of the experimental example and the comparative example 1-5. It is explanatory drawing for demonstrating the spring support structure which concerns on Example 2. FIG. It is explanatory drawing for demonstrating the support structure which concerns on Example 3. FIG. It is explanatory drawing for demonstrating the support structure which concerns on Example 4. FIG. It is explanatory drawing for demonstrating the support structure which concerns on Example 5. FIG. It is explanatory drawing for demonstrating another spring support structure.

The matters shown here are for illustrative purposes and embodiments of the present invention, and are the most effective and effortless explanations for understanding the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this regard, it is not intended to show structural details of the invention beyond a certain degree necessary for a fundamental understanding of the invention, and some embodiments of the invention are provided by description in conjunction with the drawings. It is intended to clarify to those skilled in the art how it is actually realized.

The support structure of the sliding member according to the present embodiment is, for example, as shown in FIGS. 1 and 2, for example, a member (4A) that receives a thrust load of the sliding member (3, 14, 18, 22, 25, 26). The supporting structure (1A to 1F) of the sliding member received by the receiving surface (4a) of (4F), the sliding member (3, 14, 18, 22, 25, 26) and the receiving member (4A to 4F). An annular first thrust sheet (11) in contact with a sliding member (3, 14, 18, 22, 25, 26) and an annular second thrust sheet (12) in contact with a receiving surface (4a). The first thrust sheet (11) is formed of a polyacetal resin, and the second thrust sheet (12) is formed of a fluororesin.

The use of the support structure (1A to 1F) is not particularly limited. The support structure can be used, for example, in place of the thrust bearing generally used in equipment or the like. The support structure is suitably used as a suspension of a vehicle such as an automobile, a motorcycle, or a bicycle. Examples of this suspension type include MacPherson struts, double wishbones, multilinks, trailing arms, de Dion, torsion beams, rigid and the like. Further, according to this support structure, the suspension performance can be improved even when the upper and lower surfaces of the coil spring cannot be installed in parallel, such as a pillow upper mount in which the coil spring is directly mounted and a torsion beam type suspension.
Further, since the support structure does not need to be coated with grease or other oils and fats, it is suitably used for, for example, food manufacturing equipment, medical equipment, on-board equipment in the aerospace industry, and the like.

The type, size, material, etc. of the sliding members (3, 14, 18, 22, 25, 26) are not particularly limited. Examples of the sliding member include various springs (particularly coil springs), rotating bodies, and the like.
More specifically, the sliding member is, for example, a coil spring (3) (see FIG. 1) or an elastic member (14) arranged in contact with the shaft end of the coil spring (3). (See FIG. 4) and the like. The support structure of this type of sliding member (3, 14) is suitably used, for example, as a suspension of a vehicle.
Further, as the sliding member, for example, a form (see FIG. 5) in which the rotating body (18) is rotatably supported by the receiving member (4C) can be mentioned. The support structure of this type of sliding member (18) is suitably used, for example, as a potter's wheel or a turntable.
Further, as the sliding member, for example, a form (see FIG. 6) in which the filler bolt (22) is screwed into the receiving member (4D) can be mentioned. The support structure of this type of sliding member (22) is suitably used as a storage portion for oil such as differential oil, engine oil, and mission oil, for example.
Further, as the sliding member, for example, a form (see FIG. 7) which is a connecting body (25, 26) connected to a tubular receiving member (4E, 4F) can be mentioned. The support structure of this type of sliding member (25, 26) is suitably used, for example, as a faucet portion of a water service.

The type, size, material, etc. of the receiving member (4A to 4F) are not particularly limited. The receiving members (4A to 4F) usually have receiving surfaces (4a) that intersect (particularly orthogonally) in the direction in which the thrust load of the sliding members (3, 14, 18, 22, 25, 26) is applied. .. On the receiving surface (4a), for example, a convex portion (7) that can be inserted inside the first and second thrust sheets (11, 12) can be raised (see FIG. 1).

The size, thickness, etc. of the first thrust sheet (11) are not particularly limited. The polyacetal resin constituting the first thrust sheet may be, for example, a polyacetal homopolymer such as polyoxymethylene (for example, manufactured by DuPont, USA, trade name “Delrin”); an oximethylene structural unit and It may be a polyacetal copolymer containing a comonomer structural unit (for example, manufactured by Polyplastics Co., Ltd., trade name "Duracon").
The first thrust sheet may contain, for example, a lubricant and / or an additive (eg, graphite fiber, glass fiber, metal fiber, powder, etc.).

The size, thickness, etc. of the second thrust sheet (12) are not particularly limited. Examples of the fluororesin constituting the second thrust sheet include PTFE (polytetrafluoroethylene), FEP (fluorinated ethylene / hexafluoropropylene copolymer), PFA (perfluoroalkoxy alkane resin), and ETFE (. Ethylene / tetrafluoroethylene copolymer) and the like.

The inner diameters (id1, id2) of the first and second thrust sheets (11, 12) may be set to the same value, for example, but the inner diameter (id1) of the first thrust sheet (11) is the second thrust. It is preferable that the value is set to be larger than the inner diameter (id2) of the sheet (12). This is because a gap (S) is formed between the outer circumference of the convex portion (7) of the receiving member (4A to 4F) and the inner circumference of the first thrust sheet (11), so that the sliding member (3) This is because the sliding resistance can be reduced even if it is shaken (see FIG. 1).
The difference (id1-id2) between the inner diameter (id1) of the first thrust sheet (11) and the inner diameter (id2) of the second thrust sheet (12) is, for example, 0.1 to 3 mm (preferably 0.5 to). 2 mm).

The outer diameters (od1, od2) of the first and second thrust sheets (11, 12) may be set to different values, for example, but the assembly of the first and second thrust sheets (11, 12) may be set. From the viewpoint of sex, it is preferable that the outer diameters (od1, od2) of the first and second thrust sheets (11, 12) are set to substantially the same value.

For example, another thrust sheet may be interposed between the first and second thrust sheets (11, 12), but from the viewpoint of reducing the number of parts, the first and second thrust sheets (11) , 12) are preferably directly overlapped.
As the other thrust sheets, for example, one or a plurality of thrust sheets formed of a polyacetal resin may be adopted, or one or a plurality of thrust sheets formed of a fluororesin may be adopted. It is possible to adopt a thrust sheet that combines the above.
As a reference example, there is a form in which a first thrust sheet formed of a polyacetal resin, a second thrust sheet formed of a fluororesin, and a third thrust sheet formed of a polyacetal resin are laminated. Further, there is a form in which the first to third thrust sheets formed of the fluororesin are laminated.

Here, the polyacetal resin constituting the first thrust sheet (11) is extremely excellent in fatigue resistance. In addition, it is a very well-balanced resin with excellent friction / wear resistance, low noise resistance, chemical resistance, creep resistance, and dimensional stability. Low water absorption. Originally, it is inferior in weather resistance, but recently, grades with improved weather resistance have been developed by selecting ultraviolet stabilizers and pigments. It is also most often used in the general environmental temperature range (automobiles, office equipment, AV, etc.). It also has well-balanced mechanical properties as an engineering plastic and also has self-lubricating properties. Furthermore, the moldability is good, the price is low, and the dimensional accuracy is good. Furthermore, the slidability is significantly improved by blending a lubricant or the like.

As the physical properties of the polyacetal resin, for example, it is known that the specific gravity is 1.41 to 1.42 and the hardness (Rockwell) is M90 / R120.
As mechanical properties, for example, the tensile yield stress is 61 to 69 MPa, the breaking strain is 20 to 75%, the tensile elastic modulus is 2800 MPa, the isot impact strength is 6.9 to 12.0 KJ / m ² , and the compressive yield stress. Is 98 to 130 MPa, the bending stress is 88 to 96 MPa, and the tapered wear resistance is 6 to 20 mg / 1000.
Further, as thermal properties, for example, the heat resistant temperature (continuous) is 90 to 100 ° C., the deflection temperature under load (0.45 / 1.8 MPa) is 160 to 170 ° C./110 to 120 ° C., and the deflection temperature is −40 ° C. It is known that the linear expansion rate is 8.1 to 8.5 × 10 ^-5 K ^-1 , the thermal conductivity is 0.25 W / m · k, and the heat resistance is slow combustion.
Further, as electrical properties, for example, it is known that the volume resistivity is 10 ^15-17 Ω · cm, the withstand voltage is 26 to 34 MV / m, and the dielectric constant is 3.1 to 3.9 × ¹⁰⁶ Hz. ing.
Further, as chemical properties, for example, it is known that the acid resistance is × in 4 steps, the alkali resistance is × in 4 steps, the solvent resistance is ⊚ in 4 steps, and the water absorption rate is 0.22 to 0.25%. Has been done.
Further, it is known that, as optical properties, for example, the refractive index is 1.48, the transparency is opaque, and the weather resistance is slightly discolored.

The fluororesin constituting the second thrust sheet (12) is extremely excellent in heat resistance, cold resistance, chemical resistance, heat resistance and water resistance, and weather resistance. Furthermore, it is excellent in non-adhesiveness, low friction, and high frequency characteristics.
In particular, PTFE resin is widely used as the most popular material in the fluororesin series. In addition, it has the lowest coefficient of friction among existing materials and has excellent chemical resistance, so it has a wide range of applications. Its own wear resistance and mechanical strength are used by the addition of fillers or re-layering with metallic materials. The improvement effect is remarkable.

As the physical properties of the PTFE resin, for example, it is known that the specific gravity is 1.70 to 2.20 and the hardness (Rockwell) is R75 to 95.
The mechanical properties are, for example, a tensile yield stress of 19 to 34 MPa, a breaking strain of 200 to 400%, a tensile elastic modulus of 390 MPa, an Izot impact strength of 14 to 16 KJ / m ² , a compressive yield stress of 15 MPa, and a taper. Formula wear resistance is known to be 7 mg / 1000.
Further, as thermal properties, for example, the heat resistant temperature (continuous) is 290 ° C, the deflection temperature under load (0.45 / 1.8 MPa) is 121 ° C / 90 ° C, the brittle temperature is <-100 ° C, and the linear expansion rate is. It is known that 4.5 to 7.0 × 10 ^-5 K ^-1 , the thermal conductivity is 0.12 to 0.25 W / m · k, and the heat resistance is nonflammable.
Further, as electrical properties, for example, it is known that the volume resistivity is> 10 ²⁰ Ω · cm, the withstand voltage is 19 MV / m, and the dielectric constant is <2.1 × ¹⁰⁶ Hz.
Further, as chemical properties, for example, it is known that the acid resistance is ⊚ in 4 steps, the alkali resistance is ⊚ in 4 steps, the solvent resistance is ⊚ in 4 steps, and the water absorption rate is 0.00%.
Further, it is known that, as optical properties, for example, the refractive index is 1.35, the transparency is opaque, and the weather resistance is excellent.

Further, the polyacetal resin (homopolyma, natural / carbon glass filled) has a static friction coefficient of 0.32 and a dynamic friction coefficient of 0.18, and the PTFE resin (natural) has a static friction coefficient of 0.13 and a dynamic friction coefficient of 0.09. It is known that there is.
Further, when the specific wear amount of the PTFE resin (natural) is 1.0, the specific wear amount of the polyacetal resin (homopolyma, natural) is 2.4, and the specific wear amount of the polyacetal resin (homopolyma, carbon glass filling) is 2.4. Is known to be 2.0.

In the support structure (1A to 1F) of the sliding member, polyacetal having excellent self-lubricating property is used as a material of the first thrust sheet (11) in contact with the sliding member (3, 14, 18, 22, 25, 26). In addition to using a resin, a fluororesin having excellent self-lubricating properties and having a smaller hardness and friction coefficient than a polyacetal resin is used as the material of the second thrust sheet (12) in contact with the receiving surface (4a). As a result, the self-lubricating properties of the first and second thrust sheets (11, 12) are synergistically synthesized, and the second thrust sheet (12) plays a role of a cushion function with respect to the first thrust sheet (11). Is considered to fulfill. As a result, the sliding resistance of the receiving surface (4a) of the receiving member (4A to 4F) by the sliding member (3, 14, 18, 22, 25, 26) is sufficiently reduced. Further, it becomes difficult for dust and the like to infiltrate, and the weather resistance is improved.
In particular, according to the form in which the first and first thrust sheets (11, 12) are in contact with each other and overlapped with each other, the cushion function of the second thrust sheet (12) acts directly on the first thrust sheet (11). The effect of reducing sliding resistance and the effect of suppressing the intrusion of dust and the like become remarkable.
Further, when the support structure (1A to 1F) of the sliding member is used in an environment where the temperature is high, the heat is effectively absorbed and dispersed by the second thrust sheet (12) having excellent thermal properties. Therefore, the thermal expansion of the first thrust sheet (11) is covered, and the durability is improved.

The reference numerals in parentheses of each configuration described in the above-described embodiment indicate the correspondence with the specific configurations described in the examples described later.

Hereinafter, the present invention will be specifically described with reference to Examples 1 to 5 with reference to the drawings. In Examples 1 and 2, a spring support structure used for a suspension of an automobile is exemplified as a "support structure for a sliding member" according to the present invention.

<Example 1>
In the spring support structure 1A according to the present embodiment, as shown in FIGS. 1 and 2, both shaft ends of the coil spring 3 (exemplified as a “sliding member” according to the present invention) are on the upper side and the lower side. It is supported by a receiving member 4A (spring seat) of the above. Between the shaft end of the coil spring 3 and the receiving member 4A, the annular first thrust sheet 11 in contact with the shaft end surface of the coil spring 3 and the annular second thrust in contact with the receiving surface 4a of the receiving member 4A. It is interposed in a state where the sheet 12 is overlapped with each other.

The coil spring 3 is made of metal (for example, spring steel or the like). Further, the receiving member 4A is formed of a metal (for example, aluminum or the like) different from that of the coil spring 3. Further, the receiving member 4A has a receiving surface 4a orthogonal to the axial direction of the coil spring 3. On the receiving surface 4a, a cylindrical convex portion 7 that can be inserted inside the first and second thrust sheets 11 and 12 is raised. Further, the receiving member 4A is formed in a circular shape in a plan view.

A damper 8 is attached to the inside of the lower receiving member 4A as shown by a virtual line in FIG. Further, the piston rod 8a of the damper 8 is inserted into the central hole of the upper receiving member 4A. An upper mount 9 fixed to a component on the automobile side is attached to the tip end side of the piston rod 8a.

The first thrust sheet 11 is made of a polyacetal resin (for example, Duracon or the like). The first thrust sheet 11 has an inner diameter id1 of about 65 mm, an outer diameter od1 of about 84 mm, and a thickness t1 of about 1 mm (see FIG. 2).

The second thrust sheet 12 is made of a fluororesin (for example, PTFE or the like). The second thrust sheet 12 has an inner diameter id2 of about 64 mm, an outer diameter od2 of about 84 mm, and a thickness t2 of about 1 mm (see FIG. 2).

Here, the outer diameters od1 and od2 of the first and second thrust sheets 11 and 12 are set to substantially the same value. Further, the inner diameter id1 of the first thrust sheet 11 is set to a value larger than the inner diameter id2 of the second thrust sheet 12. A gap S is formed between the outer circumference of the convex portion 7 of the receiving member 4A and the inner circumference of the first thrust sheet 11 (see FIG. 1). On the other hand, no gap is formed between the outer circumference of the convex portion 7 of the receiving member 4A and the inner circumference of the second thrust sheet 12.

Next, the operation and effect of the spring support structure 1A having the above configuration will be described.
In the suspension provided with the spring support structure 1A, when a twist occurs due to expansion and contraction of the coil spring 3 during traveling of an automobile, the receiving member is provided by the first and second thrust sheets 11 and 12 made of a resin material having excellent wear resistance. The sliding resistance of the receiving surface 4a of 4A is effectively reduced.

According to the spring support structure 1A, between the coil spring 3 and the receiving member 4A, an annular first thrust sheet 11 in contact with the shaft end of the coil spring 3 and an annular second thrust sheet in contact with the receiving surface 4a. The first thrust sheet 11 is formed of a polyacetal resin, and the second thrust sheet 12 is formed of a fluororesin. As described above, the combination of the first thrust sheet 11 made of a polyacetal resin having excellent self-lubricating property and the second thrust sheet 12 made of a fluororesin having excellent self-lubricating property and having a hardness and a friction coefficient smaller than that of the polyacetal resin. Therefore, the sliding resistance of the receiving surface 4a of the receiving member 4A due to the expansion and contraction of the coil spring 3 can be sufficiently reduced to improve the durability. As a result, the buckling prevention function is excellent, the original performance of the coil spring 3 is stably drawn out, and smooth operation is possible, so that the riding comfort of the automobile is overwhelmingly improved. Further, since the water resistance is high and it is difficult for dust and the like to infiltrate, the weather resistance can be improved. Further, as compared with the conventional support structure having a thrust bearing, the maintainability is excellent and the production cost can be reduced.

Further, the spring support structure 1A is arranged in the vicinity of the engine and may be in a high temperature state of 60 to 70 ° C. in summer, but the heat is effective by the second thrust sheet 12 having excellent thermal properties. Since it is absorbed and dispersed in the first thrust sheet 11, the thermal expansion of the first thrust sheet 11 is covered.

Further, in this embodiment, the convex portion 7 is raised on the receiving surface 4a, and the inner diameter id1 of the first thrust sheet 11 is set to a value larger than the inner diameter id2 of the second thrust sheet 12. There is. As a result, a gap S is formed between the inner circumference of the first thrust sheet 11 and the outer circumference of the convex portion 7 of the receiving member 4A. Therefore, even if the coil spring 3 is shaken, the first thrust sheet 11 can smoothly rotate and reduce the sliding resistance.

Further, in this embodiment, the outer diameters od1 and od2 of the first and second thrust sheets 11 and 12 are set to substantially the same value. As a result, even when the above-mentioned gap S is formed, both sheets 11 and 12 can be set at appropriate assembly positions by aligning the outer circumferences of the first and second thrust sheets 11 and 12. can.

Next, the test results of the spring support structure of Experimental Example and Comparative Example 1-5 will be described.
In this test, the sliding resistance and weather resistance of the receiving member were evaluated in an automobile in which each spring support structure was assembled to the suspension. These evaluations were made based on the operation observation of the spring support structure and the ride quality of the occupant when the car was running.

In the experimental example, one Duracon sheet and one PTFE sheet were overlapped and interposed between the coil spring and the receiving member. Further, in Comparative Example 1, one Duracon sheet was interposed between the coil spring and the receiving member. Further, in Comparative Example 2, a metal thrust bearing was interposed between the coil spring and the receiving member. Further, in Comparative Example 3, one nylon or Duracon resin sheet and one stainless steel plate were overlapped and interposed between the coil spring and the receiving member. Further, in Comparative Example 4, two PTFE sheets were superposed and interposed between the coil spring and the receiving member. Further, in Comparative Example 5, two Duracon sheets were superposed and interposed between the coil spring and the receiving member.

As a result, as shown in FIG. 3, in the experimental example, it was confirmed that the sliding resistance of the contact surface of the receiving member (spring mount) due to the vertical movement of the coil spring was overwhelmingly reduced. In addition, it was confirmed that the weather resistance is high because the soft resin material and the hard resin material, which have excellent wear resistance, are combined, so that the water resistance is high and it is difficult for dust and the like to enter.
According to the feeling of the driver who participated in Gymkhana (motor sports performed on paved road surface) by car, the spring support structure of this experimental example has extremely good durability compared to the spring support structure of comparative example 1. confirmed.

The spring support structure of the experimental example can be attached to both ends of the coil spring. The recommended mounting positions are one end and both ends of the spring. Further, in the experimental example, as maintenance, it is necessary to replace the Duracon sheet and the PTFE sheet when they are worn out. Further, the annular Duracon sheet and the PTFE sheet can be obtained by cutting out from the material.

In Comparative Example 1, it was confirmed that the sliding resistance of the contact surface of the receiving member (spring mount) due to the vertical movement of the coil spring was clearly reduced. Further, since it is a single Duracon sheet, it has high water resistance, but the coefficient of friction tends to increase due to the intrusion of dust and the like, and it has been confirmed that the weather resistance is slightly low.

The spring support structure of Comparative Example 1 can be attached to both ends of the coil spring. As the recommended mounting position, both ends of the spring are preferable. Further, in Comparative Example 1, as maintenance, replacement is required when the Duracon sheet is consumed. Further, the annular Duracon sheet can be obtained by cutting out from the material.

In Comparative Example 2, it was confirmed that the sliding resistance of the contact surface of the receiving member (spring mount) due to the vertical movement of the coil spring was overwhelmingly reduced. In addition, since metal bearings are used, it is strictly prohibited for water to enter the case and dust to enter, and it has been confirmed that floating rust is likely to occur due to contact with dissimilar metals, and the weather resistance is low.

The spring support structure of Comparative Example 2 can be attached to only one end of the spring. Further, in Comparative Example 1, regular overhaul work is required for maintenance. Further, in Comparative Example 2, a thrust bearing is prepared, and a case dedicated to the thrust bearing is required.

In Comparative Example 3, it was confirmed that the sliding resistance of the contact surface of the receiving member (spring mount) due to the vertical movement of the coil spring was clearly reduced. It was also confirmed that the contact between the stainless steel plate and dissimilar metals tends to cause floating rust, and the friction coefficient tends to increase due to the intrusion of dust and the like, resulting in low weather resistance.

The spring support structure of Comparative Example 3 can be attached to both ends of the coil spring. As the recommended mounting position, both ends of the spring are preferable. Further, in Comparative Example 3, maintenance requires confirmation of the state of the stainless steel plate and grease-up. Further, the annular resin sheet and the stainless steel plate can be obtained by cutting out from the material.

In Comparative Example 4, it was confirmed that since the material is a soft resin, smooth operation becomes difficult when the spring end bites into it.

In Comparative Example 5, it was confirmed that since the material is a hard resin, the friction tends to increase and it is not suitable for increasing the number of plates.

<Example 2>
Next, the spring support structure 1B according to the second embodiment will be described, but the parts having substantially the same configuration as the spring support structure 1A according to the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 4, the spring support structure 1B according to the present embodiment is exemplified as a rubber elastic member 14 (“sliding member” according to the present invention) arranged in contact with the shaft end portion of the coil spring 3. ) Is supported by a metal receiving member 4B on the vehicle body side (receiving member 4B on the vehicle body side). Between the elastic member 14 and the receiving member 4B, an annular first thrust sheet 11 in contact with the surface of the elastic member 14 and an annular second thrust sheet 12 in contact with the receiving surface 4a of the receiving member 4B are overlapped. It is intervened in the state of being squeezed. The first thrust sheet 11 is made of a polyacetal resin (for example, Duracon or the like). Further, the second thrust sheet 12 is made of a fluororesin (for example, PTFE or the like).

According to the present spring support structure 1B, the action and effect are substantially the same as those of the spring support structure 1A of the first embodiment.

<Example 3>
Next, the support structure 1C according to the third embodiment will be described, but the parts having substantially the same configuration as the spring support structure 1A according to the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In the third embodiment, as the "support structure for the sliding member" according to the present invention, the support structure 1C for a rotating body used as a wheel or a turntable is exemplified.

As shown in FIG. 5, the support structure 1C of the main rotating body rotatably supports the rotating body 18 including the rotating shaft 17 around an axis orthogonal to the receiving surface 4a of the receiving member 4C, and the thrust load of the rotating body 18 is reached. It is configured to receive on the receiving surface 4a of the receiving member 4C. Between the end of the rotating body 18 and the receiving member 4C, there is an annular first thrust sheet 11 in contact with the rotating body 18 and an annular second thrust sheet 12 in contact with the receiving surface 4a of the receiving member 4C. It is intervened in a stacked state. The first thrust sheet 11 is made of a polyacetal resin (for example, Duracon or the like). Further, the second thrust sheet 12 is made of a fluororesin (for example, PTFE or the like).
The support structure 1C of the rotating body may be used instead of the metal bearing, or may be used in combination with the metal bearing.

According to the support structure 1C of the rotating body, the sliding resistance of the receiving surface 4a of the receiving member 4C by the rotating body 18 can be sufficiently reduced to improve the durability. As a result, the rotating body 18 can be stably rotated with respect to the receiving member 4C for a long period of time.

<Example 4>
Next, the support structure 1D according to the fourth embodiment will be described, but the parts having substantially the same configuration as the spring support structure 1A according to the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In the fourth embodiment, as the "support structure of the sliding member" according to the present invention, the support structure 1D of the filler bolt used as the oil storage portion for the differential oil or the like is exemplified.

As shown in FIG. 6, the support structure 1D of the filler bolt is screwed into the screw portion 23 formed on the member 4D to receive the filler bolt 22, and receives the thrust load of the filler bolt 22 on the receiving surface 4a of the member 4D. It is configured in. Between the head portion 22a of the filler bolt 22 and the receiving member 4D, the annular first thrust sheet 11 in contact with the head portion 22a of the filler bolt 22 and the annular second ring in contact with the receiving surface 4a of the receiving member 4D. It is interposed in a state where the thrust sheet 12 is overlapped with each other. The first thrust sheet 11 is made of a polyacetal resin (for example, Duracon or the like). Further, the second thrust sheet 12 is made of a fluororesin (for example, PTFE or the like).

According to the support structure 1D of the filler bolt, the sliding resistance of the receiving surface 4a of the receiving member 4D by the filler bolt 22 can be sufficiently reduced to improve the durability. As a result, a force is evenly applied from the filler bolt 22 to the receiving surface 4a, and the first and second thrust sheets 11 and 12 can effectively function as gaskets.

<Example 5>
Next, the support structures 1E and 1F according to the fifth embodiment will be described, but the parts having substantially the same configuration as the spring support structure 1A according to the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In the fifth embodiment, as the "support structure of the sliding member" according to the present invention, the support structures 1E and 1F of the connecting body used as the water faucet portion are exemplified.

As shown in FIG. 7, the support structure 1E of the present connection body receives the thrust load of the nut body 25 by screwing the nut body 25 (exemplified as a “connection body” according to the present invention) into the tubular receiving member 4E. It is configured to receive on the receiving surface 4a (shaft end surface) of the member 4E. Between the nut body 25 and the receiving member 4E, an annular first thrust sheet 11 in contact with the nut body 25 and an annular second thrust sheet 12 in contact with the receiving surface 4a of the receiving member 4E were overlapped. Intervened in the state. The first thrust sheet 11 is made of a polyacetal resin (for example, Duracon or the like). Further, the second thrust sheet 12 is made of a fluororesin (for example, PTFE or the like).
A faucet operating portion 30 is provided through the central portion of the nut body 25. The faucet operation unit 30 includes a handle 31, a spindle 32 that moves along the axis of the receiving member 4E by operating the handle 31, and a coma packing 33 that is provided at the tip of the spindle 32 and opens and closes a hole 34. I have.

According to the support structure 1E of the connection body, the sliding resistance of the receiving surface 4a of the receiving member 4E by the nut body 25 can be sufficiently reduced to improve the durability. As a result, the first and second thrust sheets 11 and 12 can be effectively used as packing in the water faucet portion.

The support structure 1F of the connection body rotatably supports the faucet spout 26 (exemplified as a “connection body” according to the present invention) on the tubular receiving member 4F, and receives the thrust load of the faucet spout 26 on the member 4F. It is configured to receive on the receiving surface 4a (shaft end surface). Between the faucet spout 26 and the receiving member 4F, an annular first thrust sheet 11 in contact with the enlarged diameter portion 26a of the faucet spout 26 and an annular second thrust sheet 12 in contact with the receiving surface 4a of the receiving member 4F. And are intervened in a state of being overlapped. The first thrust sheet 11 is made of a polyacetal resin (for example, Duracon or the like). Further, the second thrust sheet 12 is made of a fluororesin (for example, PTFE or the like).
A nut body 35 is screwed to the tip of the receiving member 4F.

According to the support structure 1F of the connection body, the sliding resistance of the receiving surface 4a of the receiving member 4F by the faucet spout 26 can be sufficiently reduced to improve the durability. As a result, the faucet spout 26 can be stably rotated with respect to the receiving member 4F for a long period of time, and the first and second thrust sheets 11 and 12 can be effectively functioned as packing in the water faucet.

In the present invention, the present invention is not limited to the above-mentioned Examples 1 to 5, and various modifications can be made within the scope of the present invention according to the purpose and application. That is, in the first embodiment, the spring support structure 1A provided with two pairs of thrust sheets 11 and 12 corresponding to both ends of the coil spring 3 is exemplified, but the present invention is not limited to this, and for example, one of the coil springs 3 is provided. A spring support structure 1A having a pair of thrust seats 11 and 12 corresponding only to the ends may be provided.

Further, for example, as shown in FIG. 8, in a form in which a plurality of coil springs 3 are arranged side by side along the axial direction, a pair of first and second thrust sheets are attached to a receiving member 4 connecting the shaft ends of both springs 3. Two sets of 11 and 12 may be provided.

Further, in the first embodiment, the embodiment in which the gap S is formed between the inner circumference of the first thrust sheet 11 and the outer circumference of the convex portion 7 of the receiving member 4A is exemplified, but the present invention is not limited to this, and for example, the first. 1 The gap S may not be formed between the inner circumference of the thrust sheet 11 and the outer circumference of the convex portion 7 of the receiving member 4A.

Further, in the first embodiment, the embodiment in which the gap S is not formed between the inner circumference of the second thrust sheet 12 and the outer circumference of the convex portion 7 of the receiving member 4A is exemplified, but the present invention is not limited to this, and for example, the first. 2 A gap S may be formed between the inner circumference of the thrust sheet 12 and the outer circumference of the convex portion 7 of the receiving member 4A.

The present invention is not limited to the embodiments detailed above, and various modifications or modifications can be made within the scope of the claims of the present invention.

The present invention is widely used as a technique for receiving and supporting a sliding member with a member.

1A to 1F; support structure, 3; coil spring (sliding member), 4A to 4F; receiving member, 4a; receiving surface, 11; first thrust sheet, 12; second thrust sheet, 14; elastic member (sliding member) Member), 18; Rotating body (sliding member), 22; Filler bolt (sliding member), 25; Nut body (connecting body), 26; Faucet spout (connecting body), id1; Inner diameter of first thrust sheet, id2; Inner diameter of the second thrust sheet.

Claims (8)

It is a support structure of the sliding member that receives the thrust load of the sliding member and receives it on the receiving surface of the member.
An annular first thrust sheet in contact with the sliding member and an annular second thrust sheet in contact with the receiving surface are interposed between the sliding member and the receiving member.
The first thrust sheet is formed of a polyacetal resin and has a polyacetal resin.
The second thrust sheet is a support structure for a sliding member, characterized in that it is made of a fluororesin. The support structure for a sliding member according to claim 1, wherein the first thrust sheet and the second thrust sheet are in contact with each other. The support structure for a sliding member according to claim 1 or 2, wherein the sliding member is a coil spring or an elastic member arranged in contact with the shaft end of the coil spring. The support structure for a sliding member according to claim 1 or 2, wherein the sliding member is a rotating body that is rotatably supported by the receiving member. The support structure for a sliding member according to claim 1 or 2, wherein the sliding member is a filler bolt screwed into the receiving member. The support structure for a sliding member according to claim 1 or 2, wherein the sliding member is a connecting body connected to the tubular receiving member. On the receiving surface, a convex portion that can be inserted into the first thrust sheet and the second thrust sheet is raised.
The support structure for a sliding member according to any one of claims 1 to 6, wherein the inner diameter of the first thrust sheet is larger than the inner diameter of the second thrust sheet. The support structure for a sliding member according to any one of claims 1 to 3, which is used for a suspension of a vehicle.

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