JP6227692B2 - Plastic thrust washer - Google Patents

Description

  The present invention relates to a resin thrust washer that is mounted on a shaft portion of a rotating body, and relates to a resin thrust washer having an integral shape that is manufactured with high dimensional accuracy and at low cost.

  The thrust washer is provided as a protective component around the shaft portion of the rotating body in the mechanical device.

  FIG. 10 shows an example in which such a thrust washer is attached to one of the rotating bodies 61 and 62 that rotate relative to each other inside the automobile gear.

  The thrust washer 63 is formed of resin as a donut-shaped annular body (hereinafter referred to as a donut-shaped annular body) 64, and has a lubricating oil introduction space 65 extending radially outward from the inner peripheral side. It has a tubular projection 66 that extends from 65 to the outside of the back surface. The inside (the inside of the thrust washer 63, the tubular protrusion 66, and the like) has a circulation path so that the lubricating oil can circulate inside the thrust washer 63 and the like. The thrust washer 63 is supported concentrically with the rotating body 62 by inserting the tubular protrusion 66 into a fitting hole 70 provided around a shaft portion (not shown) of the rotating body 62. Has been.

  When the rotating body 62 rotates, the lubricating oil flows in the radial direction of the thrust washer 63 by centrifugal force and flows into the introduction space 65, and flows and rotates from the introduction space 65 through the tubular protrusion 66, the fitting hole 70, and the like. Lubricate the surface of the body. The lubricating oil also flows into the gap between the annular body 64 and the other rotating body 61 and lubricates the two rotating bodies 61 and 62.

  In order to manufacture a thrust washer having an external structure and an internal structure with a resin, it is generally required for various reasons that the entire structure can be formed in one process. Such production was not successful. For this reason, it was usual to manufacture parts with some shapes separately by injection molding method, etc., and then join the multiple members with adhesive etc. to manufacture a thrust washer as a finished product . In FIG. 10, 8 shows an example of a joint portion by welding or an adhesive.

  As one of such methods, Patent Document 1 discloses that a donut-shaped annular body is composed of two halved members having a shape obtained by dividing the annular introduction space by a plane perpendicular to the central axis of the annular body. There has been a proposal that a resin thrust washer is constructed by joining two half members at the outer periphery by bonding or the like.

  However, in the case of a thrust washer having a joined structure, such as the joined thrust washer described in Patent Document 1, for example, when used inside an automobile gear, the low temperature condition, the low pressure condition, a paved asphalt road, etc. However, even if it can be used stably for a long time, the gear structure of an automatic vehicle in recent years has become very complicated as the number of steps increases, such as from a four-speed shift to an eight-speed shift. It has become difficult to understand, and in four-wheel drive vehicles that run on rough roads, extremely low temperatures, and hot and humid environments, it can be joined by long-term use under high temperatures or vibrations from the top, bottom, left, and right of the car. The problem that a part may peel has arisen.

  Also, in order to adhesively bond the two halved members to each other at the outer periphery, a lot of tests must be conducted to confirm whether the adhesive bonding is sufficient. Therefore, many destructive peeling tests are required. Also, from the results of such inspection, it was very difficult to extract all defective products.

  Therefore, once a defective product is detected, all of the lot must be discarded, and the influence on cost, yield, production efficiency, etc. is very large. Moreover, in order to correctly maintain and manage the bonding / joining apparatus and the like, it is necessary to have advanced process management and operator skill in various fields, and it is difficult to maintain them thoroughly.

  FIG. 3A shows an overall view of a conventional typical resin thrust washer whose main part is shown in FIG. As a means for joining the two halved members 10 and 11, the welding is typically performed by welding. As the welding means, ultrasonic welding, vibration welding, laser welding, spin welding, or the like is used, and adhesive bonding using an adhesive is performed regardless of the welding means.

  Also, for recreational purposes such as RV vehicles and automobiles exported overseas, there are cases where they run on rough roads, extremely low temperatures, high temperatures, high humidity, and submerged roads exceeding the normal level, and four-wheel drive In cars, due to long-term use under high temperatures and vibrations of the car up and down, left and right, there was a problem that the load was more than normal and the joint was peeled off.

  In particular, in order to bond the two halved members to each other at the outer periphery, it is necessary to conduct a lot of tests to confirm whether the bonding is sufficient, so that a lot of time and workers are taken into the debonding test. It was difficult to pick out defective products from the results of the inspection of the appearance alone. As a result, in particular, when a defective product is extracted, the lot may be discarded. Also, in order to maintain and manage the bonding function correctly in the bonding machine, it is necessary not only to maintain a large number of regular maintenance and materials, but also to provide thorough training for the workers, with high accuracy and It was very difficult to produce a high-strength thrust washer stably. Further, for example, if the time required for ultrasonic bonding is increased or the intensity of ultrasonic waves is increased in order to increase the strength of the bonded portion, the product surface is melted and the appearance is deteriorated, resulting in another problem.

  Furthermore, in the case of a thrust washer in which two halved members using fiber reinforced thermoplastic resin reinforced with fibers are bonded, the fibers pass through the boundary surface of the joint and straddle the two members. Since it is not arranged and the joining surface is joined only with the resin, the original strength improvement using the fiber reinforced resin cannot be utilized at the interface.

  Further, Patent Document 2 proposes a thrust washer having a fitting portion, and similarly has a concave structure composed of an annular space. In order to obtain this portion by injection molding, Collapsible cores and slide cores are used, but in the case of using collapsible cores, the depth of the annular introduction space has to be 4 mm or less due to the structure of the collapsible core. In addition, a simple slide core that is normally used needs to have a large inner diameter of the donut-shaped annular body due to the influence of the sliding core. As a result, the annular introduction space for circulating the required lubricating oil is increased. It was difficult to take. As a result, the annular introduction space is reduced, and the function as a thrust washer cannot be sufficiently performed, and the application is limited.

  Although there is an idea of manufacturing as an integrally molded product due to the above points (Patent Document 1, Paragraph 0005), in the conventional integral molding, in the mold nesting structure, from the central axis direction of the annular body Therefore, in the thrust washer formed with the annular introduction space of the lubricating oil having a shape formed by combining a plurality of arcs whose outer peripheral edge shape bulges outward in the radial direction, the annular introduction space should be small due to the complexity of the structure. I had to. Depending on the product, the annular introduction space may be 4 mm or less, and not only the lubricating oil cannot be circulated sufficiently, but it may be clogged with debris such as debris generated in the lubricating oil after many years of use, causing problems in practical use. there were.

  For this reason, conventional resin products are usually used by bonding the two halved members as described above to each other at the outer periphery, which is a problem in normal use as described above. Although there is almost no improvement, there has been a demand for further improvement in order to exhibit a sufficient function under special conditions.

JP 2003-343549 A JP 2008-95720 A

  In view of the above-mentioned problems of the prior art, the object of the present invention is to have a large annular introduction space, have a high degree of dimensional accuracy, and are molded as an integral shape by injection molding, and have a joint portion inside. There is no resin thrust washer in providing.

The resin thrust washer of the present invention that achieves the above-described object has the following configuration (1).
(1) In a resin thrust washer forming a donut-shaped annular body, the resin contains glass fibers, carbon fibers or fluorine fibers having an average fiber length of 0.1 mm to 5 mm in the following (a) to (c): An annular introduction space for lubricating oil, which is a fiber-reinforced thermoplastic polyamide resin used as a reinforcing fiber while satisfying the described mixing ratio condition, and extends radially outward from the inner peripheral side into the donut-shaped annular body And the donut-shaped annular body has an integral shape without a joint portion inside, and the inner diameter of the annular body forming the donut-shaped annular body is R (mm), and the annular introduction space A thrust thrust washer made of resin that satisfies a relationship of 4 (mm) <U (mm) +1 (mm) <R (mm) where U is the width of.
(A) In the case of glass fiber, the mixing ratio (% by weight) (vs. the weight of the entire product) is 5% to 60%,
(B) In the case of carbon fiber, the mixing ratio (% by weight) (vs. the weight of the entire product) is 5% to 40%,
(C) In the case of fluorine fibers, the mixing ratio (% by weight) (weight of the entire product) is 10% to 50%.

Furthermore, the resin thrust washer of the present invention described in (1) preferably has any one of the following (2) to (5).
(2) The resin-made thrust washer as described in (1) above, wherein the thermoplastic polyamide resin is nylon 6 resin or nylon 66 resin.
(3) The outer peripheral edge shape of the annular introduction space is a shape formed by combining a plurality of arc shapes that swell outward in the radial direction when viewed from the central axis direction of the donut-shaped annular body. The resin thrust washer as described in (2).
(4) A flow path for allowing the lubricating oil to flow from the annular introduction space toward the outside of the back surface of the washer inside the annular introduction space in the vicinity of the outer peripheral edge formed by combining the plurality of arc shapes. The resin thrust washer as described in (3) above, wherein tubular projections provided therein are provided intermittently in the annular circumferential direction.
(5) The resin thrust washer according to any one of the above (1) to (4), wherein the resin thrust washer has a tensile strength of 642 N or more.

  According to the present invention, there is provided a resin thrust washer that has a large annular introduction space, has a high degree of dimensional accuracy, is molded as an integral shape by injection molding, and does not have a joint portion inside and has high strength. The

It is the side view which showed one embodiment of the thrust washer of this invention, and is XX arrow sectional drawing in FIG. It is a right view of the thrust washer shown in FIG. It is explanatory drawing which shows the state which isolate | separated the half member of the thrust washer which has the conventional junction part. FIG. 5 shows a thrust washer having a conventional joining portion, showing a state in which the half member shown in FIG. 3A is joined, and is a cross-sectional view taken along line YY in FIG. 4. It is the right view which cut away and showed a part of thrust washer which has the conventional junction shown in Drawing 3B. It is a left view of the thrust washer shown in FIG. FIG. 6 is a bottom view of the thrust washer shown in FIG. 5. It is the model figure (front view) of the metal mold | die which showed the position of the nest | insert on the metal mold | die fixed side at the time of resin filling of injection molding used for the Example. It is the right view of the metal mold | die which showed the position of the nest | insert on the metal mold | die fixed side at the time of resin filling of the injection molding shown to FIG. 7A. It is the model figure (front view) of the metal mold | die which showed the movement position of the nest | insert on the metal mold | die fixed side after resin filling of injection molding used for the Example. It is the right view of the metal mold | die which showed the movement position of the nest | insert on the metal mold | die fixed side after resin filling of the injection molding shown to FIG. 7C. It is the model figure (front view) of the metal mold | die which showed the movement position of the nest | insert on the metal mold | die fixed side at the time of taking out the product of injection molding used for the Example. It is the model figure (front view) of the metal mold | die which showed the nesting position of the metal mold | die movable side at the time of resin filling of injection molding used for the Example. It is the bottom view of the metal mold | die which showed the position of the metal mold | die movable side nesting at the time of resin filling of the injection molding shown to FIG. 8A. It is the model figure (front view) of the metal mold | die which showed the movement position of the nest | insert on the metal mold | die movable side after resin filling of injection molding used for the Example. It is the bottom view of the metal mold | die which showed the movement position of the nest | insert on the metal mold | die movable side after resin filling of the injection molding shown to FIG. 8C. It is the model figure (front view) of the metal mold | die which showed the movement position of the nest | insert on the metal mold | die movable side at the time of taking out the product of injection molding used for the Example. It is explanatory drawing which shows the principal part of the use condition of the thrust washer of this invention. It is explanatory drawing which shows the principal part of the use condition of the conventional thrust washer.

  Hereinafter, the resin thrust washer of the present invention will be described in more detail with reference to preferred embodiments and the like shown in the drawings.

  As shown in FIG. 1, the resin thrust washer of the present invention is configured with a donut-shaped annular body (hereinafter referred to as a donut-shaped annular body) 1 as a main body. The annular body 1 is formed with a lubricant introduction space 2 extending from the inner peripheral side to the radially outer side. The lubricant introduction space 2 is formed in an annular shape as shown in FIGS. The resin thrust washer is characterized in that it is molded as an integral shape by injection molding without having a joint.

  The resin thrust washer according to the present invention is further formed with a tubular protrusion 3 that extends from the lubricant introduction space 2 to the outside of the back surface. A plurality of tubular protrusions 3 are provided, and are provided at substantially equal angles in the circumferential direction of the annular body 1 around the central axis A. Further, as shown in FIG. 5, a large number of concave grooves 4 extending in the radial direction are provided at equal intervals in the circumferential direction on the outer edge portion of the opposite front surface.

  With such a configuration, for example, as described with reference to FIG. 10, the lubricating oil is introduced into the annular introduction space 2, and then the centrifugal force during the rotation of the thrust washer that rotates with the rotation of the rotating body 62. As a result, the flow of the lubricating oil from the inner peripheral side of the donut-shaped annular body (from the introduction space 2 side) toward the outer side of the back surface of the washer occurs in the flow path in the tubular protrusion 3, and the tube tip of the protrusion 3 After that, the lubricating oil flows to the fitting hole 70 and the like and further flows to the required portion.

  The outer circumferential shape of the annular introduction space 2 of the lubricating oil is such that, for example, as shown in FIG. When viewed from the direction, the outer peripheral line shape of the space 2 is formed so as to swell outward in the radial direction, specifically, a shape in which a plurality of arc shapes are combined.

  For example, in the example shown in FIG. 2, the outer peripheral edge shape of the annular introduction space 2 includes four arc portions B centered on the central axis A and four arc portions C ( In space, it is configured by 12). The space 12 formed by the four arc portions C swelled further outward than the four arc portions B is as shown in the sectional view of FIG.

  And the tubular protrusion 3 is intermittently arranged in the circumferential direction of the annular introduction space 2 on the inner side in the vicinity of the arcuate outer peripheral edges B to C. This is because the lubricating oil flows toward the outermost peripheral edge of the introduction space due to the centrifugal force. As described above, in the example shown in FIG. 2, the shape of the outer peripheral edge is a concentric shape bulging in the radial direction with the arc center C bulging in the four radial directions and the center common to the central axis of the annular body. The tubular projection 3 is formed of four arc portions B, and in each of the eight arc portions B to C, the flow paths in the tubular projections 3 are located immediately inside the outer peripheral edge lines B to C in the space 2. A total of eight are provided with the positional relationship of opening.

  A characteristic of the resin thrust washer according to the present invention is that it is molded as an integral shape by injection molding without having a joint portion. By the movement of the nest 21 shown in FIGS. 7A to 7E and the movement of the nest 22 shown in FIGS. 8A to 8E on the movable side, it is integrally formed by injection molding with a thermoplastic resin without having a coupling portion. As shown in these figures, it is important that the insert used for injection molding can be removed from the mold after molding.

  FIG. 5 is a right side view of a thrust washer made of an integrally injection-molded thermoplastic resin that does not have a joint according to the present invention. FIG. 6 is a bottom view of the thrust washer shown in FIG.

  It is important that the resin used in the present invention is a thermoplastic polyamide resin, and 30% or less of a thermosetting resin may be mixed.

  In particular, it is optimal and important that the resin used in the present invention is a fiber-reinforced thermoplastic polyamide resin. It is important that the fibers contained in the polyamide resin used in the present invention are glass fibers, carbon fibers, or fluorine fibers, and more preferably glass fibers or carbon fibers. In particular, carbon fiber is preferable because it is light and highly rigid.

  More specifically, when the fiber contained in the fiber-reinforced thermoplastic polyamide resin is glass fiber, the mixing ratio (% by weight) (vs. the total product weight) is preferably 5% to 60%, Preferably, it is 15% to 35%. When the reinforcing fiber contained in the fiber-reinforced thermoplastic polyamide resin is carbon fiber, the mixing ratio (% by weight) (vs. the total weight of the product) is preferably 5% to 40%, more preferably 20%. ~ 35%. When the reinforcing fiber contained in the fiber-reinforced thermoplastic polyamide resin is a fluorine fiber, the mixing ratio (% by weight) (vs. the total weight of the product) is preferably 10% to 50%, and more preferably 15%. % To 30%.

  The average fiber length of the fibers contained in the fiber reinforced thermoplastic polyamide resin is important to be 0.1 mm to 5 mm, preferably 0.5 mm to 2 mm. By using such a short fiber (chopped fiber) as the reinforcing fiber, the reinforcing fiber is spread over the entire integrally formed thrust washer, and the reinforcing effect can be exhibited as a whole. With a structure in which halved parts are joined, even if reinforcing fibers are mixed in each halved part, there is no reinforcing fiber penetrating the boundary surface, and such an overall reinforcing effect cannot be obtained. .

  The thermoplastic polyamide resin (matrix resin) constituting the fiber reinforced thermoplastic resin used in the present invention is, for example, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, aromatic nylon, or their thermoplastic polyamide. It may be a resin derivative, a copolymer thereof, or a mixture thereof.

  Particularly preferred are nylon 6, a derivative of nylon 66, a copolymer thereof or a mixture thereof, and most preferred is nylon 6, nylon 66 because of its particularly good operability in injection molding and physical properties. It is.

  The most preferable combination of the reinforcing fiber of the fiber reinforced thermoplastic polyamide resin used in the present invention and the thermoplastic polyamide resin is a combination of nylon 6 or nylon 66 and glass fiber or carbon fiber. Excellent in terms of physical properties.

  According to the present invention, the thrust washer integrally formed as described above and a large annular introduction space for the lubricating oil can be provided. When the resin thrust washer is obtained by injection molding, the doughnut-shaped annular body shown in FIGS. 7 and 8 is used to prevent interference between the nests 21 and 22 because the nests 21 and 22 move in the center of the donut shape. The inner diameter R (mm) formed is 4 mm <U + 1 mm <in relation to the width U (mm) of the annular introduction space for the lubricating oil extending radially outward from the inner peripheral side inside the donut-shaped annular body. Rmm is preferred.

  7A and 7B moves to the center as shown in FIGS. 7C and 7D so that the fixed side and the movable side do not interfere with each other, and the fixed side moves as shown in FIG. 7E. Go further. Thereafter, the movable side nest 22 of FIGS. 8A and 8B moves to the center as shown in FIGS. 8C and 8D, and further moves to the movable side as shown in FIG. 8E. 7A, FIG. 7B, FIG. 7C, FIG. 7D, and FIG. 7E show only the nesting structure on the fixed side for easy understanding of the structure. 8A, FIG. 8B, FIG. 8C, FIG. 8D, and FIG. 8E show only the movable-side nesting structure for easy understanding of the structure.

  The movement of the inserts 21 and 22 may be electric, hydraulic, or angular pins.

  Since the fixed side insert 21 and the movable side insert 22 cannot move due to interference unless they move in two or more stages as described above, the thrust washer of the present invention is manufactured in a single process by integral molding. Becomes difficult.

  Further, if all the nestings are arranged on only one of the fixed side and the movable side, the nestings interfere with each other, and the remaining nesting products cannot move and cannot move, so it is not desirable because only limited products can be obtained. .

  Furthermore, in the present invention, since it is a product by integral molding by injection molding, the strength is also improved, and furthermore, it is a fiber reinforced thermoplastic polyamide resin, and since there is no joint surface, the entire thrust washer is reinforced with fibers. Can do. Further, there is no shortage of welding in the welding process, and there is no decrease in yield due to poor appearance due to over welding. Accordingly, the number of personnel can be further reduced, and stable production becomes possible.

  In addition, it is possible to obtain a molded product with less burrs after injection molding and less post-correction processing.

  For these reasons, a thrust washer can be manufactured with high strength and excellent dimensional accuracy at a lower cost.

  The thrust washer according to the present invention is used as a protective component around a shaft portion of a rotating body such as a gear or a wheel in a mechanical device. For example, as shown in FIG. 9, it is used between two rotating bodies that rotate relative to each other or between a rotating body and a stationary body. Therefore, high strength and excellent dimensional accuracy are particularly significant for mechanical devices.

Example 1
Hereinafter, the present invention will be described in more detail with reference to examples. In the following examples and comparative examples after the second example, those not particularly described are the same as the conditions described in the first example.

  The matrix resin uses nylon 6 and contains 20% by weight of glass fibers having a fiber length of 3.1 mm.

  Moreover, what was used for the measurement of fracture strength applied JIS standard K7161 and used Tensilon tensile tester RTF-1350.

  On the fixed side of the thrust washer shown in FIGS. 7A to 7D, the outer diameter of the thrust washer is 50 mm, the inner diameter R (mm) of the donut-shaped annular body is 25 mm, and the inside of the donut-shaped annular body Furthermore, the width U (mm) of the annular introduction space for the lubricating oil extending radially outward from the inner peripheral side is 16 mm.

  On the movable side of the thrust washer shown in FIGS. 8A to 8D, the outer diameter of the thrust washer is 50 mm and the inner diameter R of the donut-shaped annular body is 25 mm. The width U of the annular introduction space for the lubricating oil extending radially outward from the circumferential side is 20 mm.

  The width O between the annular introduction space and the outer radius of the donut was 5 mm.

  The yield was 99.8%, and the tensile strength was 642N when n number = 10 in an absolutely dry state with a water content of 0.1% or less.

Example 2
Nylon 66 was used as the matrix resin, and a glass fiber having a fiber length of 1.1 mm and containing 30% by weight was used.

  The yield was 99.7%, and the tensile strength was 883N with an n number = 10 in an absolutely dry state with a moisture content of 0.1% or less.

Example 3
Nylon 6 was used as a matrix resin, and carbon fiber having a fiber length of 0.3 mm was contained by 15% by weight.

  The yield was 99.5%, and the tensile strength was 956 N with an n number = 10 in an absolutely dry state with a water content of 0.1% or less.

Example 4
Nylon 66 was used as the matrix resin, and a carbon fiber having a fiber length of 0.7 mm and containing 35% by weight was used.

  The yield was 99.6%, and the tensile strength was 1735N when the n number = 10 in an absolutely dry state with a moisture content of 0.1% or less.

Reference example 1
Nylon 6 was used as a matrix resin, and reinforcing fibers were not used.

  The yield was 99.5%, and the tensile strength was 491 N with an n number = 10 in an absolutely dry state with a moisture content of 0.1% or less.

Comparative Example 1
Except as described below, the procedure was the same as in Example 1.

  As the mold for injection-molding the two halved members shown in FIG. 3, a mold having a simple structure and not using a sliding insert was used.

  The yield of both members was 99.8%, and they were joined by ultrasonic bonding. The yield of ultrasonic bonding was 98.1%, the total yield was 97.7%, and the tensile strength was 211 N in an absolutely dry state with a moisture content of 0.1% or less and n number = 10.

Comparative Example 2
Except as described below, the procedure was the same as in Example 2.

  The two halved members shown in FIG. 3 have a simple structure as a mold for injection molding, and a sliding insert is not used.

  The yield was 99.6% and 99.7% for the two members, respectively, and they were joined by ultrasonic bonding. The yield by ultrasonic bonding is 97.2%, the total yield is 96.5%, and the tensile strength is 223N with n = 10 in the absolutely dry state with a water content of 0.1% or less.

Comparative Example 3
Except as described below, the procedure was the same as in Example 3.

  The two halved members shown in FIG. 3 have a simple structure as a mold for injection molding, and a sliding insert is not used.

  The yields of the two members were 98.0% and 97.7%, respectively, and they were joined by ultrasonic bonding. The yield by ultrasonic bonding is 96.2%, the total yield is 92.1%, and the tensile strength is 247N with n = 10 in the absolutely dry state with a water content of 0.1% or less.

Comparative Example 4
Example 4 was the same as in Example 4 except as described below.

  The two halved members shown in FIG. 3 have a simple structure as a mold for injection molding, and a sliding insert is not used.

  The yields of the two members were 98.1% and 98.7%, respectively, and they were joined by ultrasonic bonding. The yield by ultrasonic bonding is 96.0%, and the total yield is 93.0%. The tensile strength is 249N with n number = 10 in an absolutely dry state with a moisture content of 0.1% or less.

Comparative Example 5
Except as described below, the procedure was the same as in Example 5.

  The two halved members shown in FIG. 3 have a simple structure as a mold for injection molding, and a sliding insert is not used.

  The yields of the two members were 99.1% and 99.3%, respectively, and they were joined by ultrasonic bonding. The yield by ultrasonic bonding is 98.1%, the total yield is 96.5%, and the tensile strength is 198N with n = 10 in the absolutely dry state with a water content of 0.1% or less.

  Table 1 shows a resin-made thrust washer integrally formed by injection molding that does not have the joints of Examples 1 to 4 and Reference Example 1, and Table 2 shows a resin-made thrust washer in which the halved members of Comparative Examples 1 to 5 are welded. Each evaluation data is shown.

1: annular body 2: introduction space 3: tubular projection 4: concave groove 8: welded portion 9 welded annular body 10, 11: half member 12: space formed by arc portion C bulging outward from arc portion B 21: fixed side insert 22: movable side insert 61, 62: rotating body 63: thrust washer 64: annular body 65: introduction space 66: tubular projection 70: fitting hole A: center axis B: center axis A centered Arc portion C: Arc portion swelled further outward than arc portion B R: Inner diameter U forming a doughnut-shaped annular body O: Width of annular introduction space for lubricating oil O: Between annular introduction space and outer diameter of donut width

Claims (5)

In a resin thrust washer forming a doughnut-shaped annular body, the resin is a glass fiber, carbon fiber or fluorine fiber having an average fiber length of 0.1 mm to 5 mm, as described in the following (a) to (c) An annular introduction space for lubricating oil extending from the inner peripheral side to the radially outer side is formed inside the doughnut-shaped annular body. The donut-shaped annular body has an integral shape having no joint portion inside, the inner diameter of the annular body forming the donut-shaped annular body is R (mm), and the width of the annular introduction space is A resin thrust washer satisfying a relationship of 4 (mm) <U (mm) +1 (mm) <R (mm) when U (mm) is satisfied.
(A) In the case of glass fiber, the mixing ratio (% by weight) (vs. the weight of the entire product) is 5% to 60%,
(B) In the case of carbon fiber, the mixing ratio (% by weight) (vs. the weight of the entire product) is 5% to 40%,
(C) In the case of fluorine fibers, the mixing ratio (% by weight) (weight of the entire product) is 10% to 50%.   The resin-made thrust washer according to claim 1, wherein the thermoplastic polyamide resin is nylon 6 resin or nylon 66 resin.   The outer peripheral edge shape of the annular introduction space is a shape formed by combining a plurality of arc shapes that swell outward in the radial direction when viewed from the central axis direction of the donut-shaped annular body. Plastic thrust washer.   Inside the annular introduction space, in the vicinity of the outer peripheral edge which is a shape formed by combining the plurality of arc shapes, a flow path for flowing the lubricating oil from the annular introduction space toward the outside of the back surface of the washer is provided. 4. The resin thrust washer according to claim 3, wherein tubular protrusions are provided intermittently in the annular circumferential direction.   5. The resin thrust washer according to claim 1, wherein the resin thrust washer has a tensile strength of 642 N or more.

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