JP2020101239A - Combined thrust washer - Google Patents

Abstract

To provide a combined thrust washer which enables reduction of a slide load.SOLUTION: A combined thrust washer 10 includes multiple thrust washers. The thrust washer is provided with a resin thrust washer 20 formed by at least one resin. In the resin thrust washer 20, slide surfaces 26 are provided on a front surface and a rear surface of a ring part 21, and oil grooves 25 recessed from the slide surface 26 are provided on at least one of the front surface and the rear surface. In the oil groove 25, an opening 27 recessed deeper than the slide surface 26 exists at an inner periphery end part of the ring part 21. An outer periphery end part of the ring part 21 is provided with oil stop walls 28 which partition the oil grooves 25 from the outer side of the ring part 21. A position of the oil stop wall 28 in a thickness direction is provided at a position equivalent to that of the slide surface 26, and existence of the oil stop wall 28 inhibits lubrication oil entering into the oil groove 25 from flowing out to the outer periphery side of the ring part 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to a combined thrust washer composed of a plurality of thrust washers.

In mechanical devices such as clutch devices, gear mechanisms, compressors, etc., thrust washers as shown in, for example, Patent Documents 1 to 4 may be attached. In the thrust washer disclosed in Patent Document 1, an oil groove is formed so as to extend from the insertion hole toward the outer peripheral side. Further, the thrust washer disclosed in Patent Document 2 includes a first oil passage that connects the inner peripheral surface and the outer peripheral surface of the thrust washer, and a dead end second oil that opens on the inner peripheral surface but does not open on the outer peripheral surface. And a road is provided.

Further, the thrust washer disclosed in Patent Document 3 is provided with an arc-shaped oil supply groove and a V-shaped oil supply groove. Further, the thrust washer disclosed in Patent Document 4 has a first oil groove and a second oil groove extending from the inner peripheral edge to the outer peripheral edge, and a communication oil groove that connects the first oil groove and the second oil groove. A configuration is disclosed.

Japanese Patent No. 4370982 JP, 2007-16931, A Japanese Patent No. 5727909 JP-A-2015-152061

Although the thrust washer has a mating member that faces the thrust washer, lubricating oil is present between the thrust washer and the mating member. Under such an environment, the lubrication state of the thrust washer is assumed to be in the mixed lubrication region in the Stribeck diagram, and although part of the thrust washer is separated from the mating material by the oil film of the lubricating oil, It is considered that the thrust washer is in direct contact with the mating material. In such a mixed lubrication region, it is not known in detail how the thrust washer should be configured to reduce the sliding load. On the other hand, in recent years, in thrust washers, there has been a further demand for reducing the sliding load on the sliding surface. Therefore, it is required to further reduce the sliding load as compared with the thrust washers disclosed in Patent Documents 1 to 4 described above.

The present invention has been made based on the above circumstances, and an object thereof is to provide a combined thrust washer capable of reducing a sliding load.

In order to solve the above problems, according to a first aspect of the present invention, there is provided a combination thrust washer including a plurality of thrust washers having a ring-shaped portion surrounding an insertion hole, wherein the thrust washer is made of at least one resin. A resin-made thrust washer made of a material containing the resin-made thrust washer is provided with a sliding surface on the front surface and the back surface of the ring-shaped portion that slides with another member, and at least one of the front surface and the back surface. Is provided with an oil groove that is recessed from the sliding surface and into which lubricating oil enters, and the oil groove has an opening that is recessed from the sliding surface at the inner peripheral end of the ring-shaped portion. Due to the presence of the oil, the lubricating oil enters from the insertion hole side, and an oil stop wall that separates the oil groove and the outside of the ring-shaped part is provided at the outer peripheral end of the ring-shaped part. Is located at a position similar to the sliding surface, and the presence of the oil stop wall prevents the lubricating oil that has entered the oil groove from flowing out to the outer peripheral side of the ring-shaped portion. A combined thrust washer is provided.

Further, another aspect of the present invention is, in the above-mentioned invention, in which the oil groove has a first oil groove inclined to one side with respect to a radial direction of the ring-shaped portion and a radial direction of the ring-shaped portion. It is preferable that a second oil groove that is inclined to the other side different from the one side is provided, and that the first oil groove and the second oil groove are connected by an opening.

Further, according to another aspect of the present invention, in the above invention, it is preferable that the thrust washer is provided with at least one metal thrust washer made of a metal.

Another aspect of the present invention is, in the above-mentioned invention, that three thrust washers are provided, and a front surface and a back surface of a ring-shaped portion of the thrust washer arranged in the center of an array of the three thrust washers. Is preferably provided with a smooth sliding surface in which no oil groove is formed.

Further, according to another aspect of the present invention, in the above-mentioned invention, the thrust washers arranged on one end side and the other end side of the array are resin-made thrust washers and are arranged on one end side and the other end side of the array. It is preferable that an oil groove is provided on a surface of the resin-made thrust washer facing the thrust washer arranged at the center of the array.

Further, another aspect of the present invention is, in the above-mentioned invention, a surface facing the thrust washer arranged in the center of the array among the resin-made thrust washers arranged on one end side and the other end side of the array. It is preferable that a smooth sliding surface in which no oil groove is formed is provided on the opposite surface.

Further, according to another aspect of the present invention, in the above-mentioned invention, it is preferable that the thrust washer arranged at the center of the arrangement of the three thrust washers is a metallic thrust washer made of metal.

Further, another aspect of the present invention is, in the above-mentioned invention, the surrounding portion surrounded by the first oil groove, the second oil groove and the opening is recessed in the thickness direction with respect to the sliding surface, and A first oil groove, and an oil bank portion that separates the first oil groove and the surrounding portion and the second oil groove are provided, and the position of the oil bank portion in the thickness direction is approximately the same as the sliding surface. It is preferably provided.

According to the present invention, it is possible to provide a combined thrust washer capable of reducing sliding load.

It is a perspective view showing composition of a combination thrust washer concerning one embodiment of the present invention. It is a top view which shows the structure of the resin-made thrust washer which comprises the combination thrust washer shown in FIG. It is a partial top view which shows the structure of the resin-made thrust washer which concerns on a 1st structure example. It is sectional drawing which shows the state which cut|disconnected the oil groove shown in FIG. 3 along the width direction. It is a partial top view which shows the structure of the resin-made thrust washer which concerns on a 2nd structure example. It is sectional drawing which shows the state which cut|disconnected the oil groove shown in FIG. 5 along the width direction. It is a partial top view which shows the structure of the resin-made thrust washer which concerns on a 3rd structural example. It is sectional drawing which shows the state which cut|disconnected the oil groove shown in FIG. 7 along the width direction. It is a partial top view which shows the structure of the resin-made thrust washer which concerns on a 4th structural example. It is sectional drawing which shows the state which cut|disconnected the oil groove shown in FIG. 9 along the width direction. It is a partial top view which shows the structure of the resin-made thrust washer which concerns on a 5th structural example. It is sectional drawing which shows the state which cut|disconnected the oil groove shown in FIG. 11 along the width direction. It is a partial top view which shows the structure of the resin-made thrust washer which concerns on a 6th structure example. It is sectional drawing which shows the state which cut|disconnected the oil groove shown in FIG. 13 along the width direction. It is a partial top view showing the composition of the resin thrust washer concerning the example of the 8th composition. It is sectional drawing which shows the state which cut|disconnected the oil groove shown in FIG. 15 along the width direction. It is a sectional view showing a schematic structure of a load measuring device. It is a figure which shows the experimental result which attached the resin-made thrust washer which concerns on the 1st-8th structural example to the load measuring apparatus, respectively. It is a top view which shows the structure of a metal thrust washer. It is a schematic diagram which shows the combination thrust washer which concerns on a 1st combination pattern. It is a schematic diagram which shows the combination thrust washer which concerns on a 2nd combination pattern. It is a schematic diagram which shows the combination thrust washer which concerns on a 3rd combination pattern. It is a schematic diagram which shows the combination thrust washer which concerns on a 4th combination pattern. It is a schematic diagram which shows the combination thrust washer which concerns on a 5th combination pattern. It is a figure which shows the experimental result which set the combination thrust washer which concerns on the 1st-5th combination pattern to the load measuring apparatus, respectively. It is a schematic diagram which shows the combination thrust washer which concerns on a 6th combination pattern and a 7th combination pattern. It is a figure which shows the experimental result which set the combination thrust washer which concerns on the 6th, 7th combination pattern to the load measuring device, respectively, and performed it. FIG. 10 is a plan view showing a configuration of a resin-made thrust washer having a communication oil groove according to a modified example of the present invention.

Hereinafter, a combined thrust washer 10 according to an embodiment of the present invention will be described with reference to the drawings.

[1. About the overall configuration of the combined thrust washer 10]
The combined thrust washer 10 is incorporated in, for example, a transmission device of a vehicle or a compressor of an air conditioner device of a vehicle. The structure of this combined thrust washer 10 is shown in FIG. FIG. 1 is a perspective view showing the configuration of the combined thrust washer 10.

As shown in FIG. 1, the combined thrust washer 10 of the present embodiment includes three thrust washers S1, S2, S3. The combined thrust washer 10 including the three thrust washers S1, S2, S3 is located between the mating members C1, C2 and is in a state of receiving a load in the thrust direction.

The environment in which the combination thrust washer 10 and the mating members C1 and C2 are provided is the environment in which the lubricating oil is supplied. However, when estimated from sliding marks of the thrust washer in various experimental results until reaching the combined thrust washer 10 according to the present embodiment and sliding loads measured by various experimental results, the combined thrust washer 10 is obtained. The lubrication state of the environment in which is used is assumed to be in the mixed lubrication region in the Stribeck diagram. Therefore, it is presumed that the oil film is present in a part between the thrust washer and the mating member, and a part of the thrust washer is in direct contact with the mating member.

The above thrust washers S1, S2, S3 are (1) a resin-made thrust washer 20 (see FIG. 2) made of a resin-containing material, and (2) a metal-made thrust washer 50 (see FIG. 19) made of a metal. It is configured to include at least one resin thrust washer 20 from the inside. Specifically, in the combined thrust washer 10 shown in FIG. 1, the resin-made thrust washer 20 may be arranged on the mating member C1 side and the mating member C2 side, and the metal thrust washer 50 may be arranged at the center. The resin thrust washer 20 may be disposed only on the C1 side and the rest may be the metal thrust washer 50. The resin thrust washer 20 may be disposed only on the mating member C2 side and the remainder may be the metal thrust washer 50. Further, the metal thrust washers 50 may be arranged only on the mating material C1 side and the remaining two may be resin thrust washers 20, and the metal thrust washers 50 may be arranged only on the mating material C2 side and the remaining two are made of resin. The thrust washer 20 made of metal may be used. Alternatively, the thrust washers 50 made of metal may be arranged on both the mating member C1 side and the mating member C2 side, and the resin thrust washer 20 may be arranged at the center. Further, all of the above three thrust washers S1, S2, S3 may be resin thrust washers 20.

[2. Constitution of resin-made thrust washer 20]
First, the configuration of the resin thrust washer 20 that constitutes the combined thrust washer 10 will be described. FIG. 2 is a plan view showing a configuration of a resin thrust washer 20 that constitutes the combined thrust washer 10 shown in FIG. 2 is a plan view showing the configuration of the resin-made thrust washer 20 according to Configuration Example 1 described later.

The resin-made thrust washers 20 are made of (1) a resin base material alone, (2) a resin base material mixed with a fibrous material, (3) a resin base material mixed with a filler, and (4) a resin. Either the base material mixed with the fibrous material and the filler is used. The resin base material, the fiber material, and the filler will be described below.

[2.1. About resin base material]
The resin base material is tetrafluoroethylene resin (PTFE), polyamide resin (PA), polyamideimide resin (PAI), polyimide resin (PI), polybenzimidazole resin (PBI), aromatic polyetherketones (PAEK). , Modified polyetherketone resin, polyphenylene sulfide resin (PPS), liquid crystal polymer, phenol resin, polyethylene resin, polystyrene resin, acrylic resin, acrylonitrile butadiene/styrene resin, polyacetal resin, polycarbonate resin, polyether sulfone resin (PES), It is either a polyetherimide resin (PEI) or a mixture (including a polymer alloy and a copolymer) in which a plurality of them are selected and mixed.

[2.2. About fiber materials]
The fibrous material is a reinforcing fiber having an average fiber length of, for example, about 0.0001 mm to 5 mm, and the fibrous material is made of an inorganic fiber such as carbon fiber, glass fiber, potassium titanate fiber or the like. , Aramid fiber, fluorine fiber and the like are used as the material, but not limited to these. Further, at least one fiber material may be selected from the above-mentioned fiber materials, and fiber materials of other materials may be selected and mixed.

When the fiber material is glass fiber, the weight ratio of the mixing ratio per product is preferably 1 to 40% by weight. When the fiber material is carbon fiber or aramid fiber, the weight ratio of the mixing ratio per product is preferably 1 to 45% by weight. Further, when the fiber material is a fluorine fiber, the weight ratio of the mixing ratio per product is preferably 5 to 55% by weight. When the fibrous material is potassium titanate, the weight ratio of the mixing ratio per product is preferably 0.1 to 5% by weight.

[2.3. Filler]
The filler is one of tetrafluoroethylene resin (PTFE), manganese sulfide (MnS), molybdenum disulfide (MoS ₂ ), graphite, calcium carbonate (CaCo ₃ ), titanium oxide and melamine cyanurate (MCA). , Or a mixture of a plurality of these selected.

[2.4. Surface Treatment of Resin Thrust Washer 20]
The surface treatment of the resin-made thrust washer 20 (including the surface modification treatment here) is a surface modification treatment using epoxysilane (manufactured by Shin-Etsu Silicone Co., Ltd.), a titanate-aluminate-based coupling agent. (Specifically, a surface modification treatment using bis-(dioctyl pyrophosphate)isopropoxy titanate; Ajinomoto Fine Techno Co., Ltd.: product name 38S), bis-(dioctyl pyrophosphate)oxyacetate titanate; product name 138S; Ajinomoto Fine Surface modification treatment using TECHNO Co., Ltd., product name 55 (manufactured by Ajinomoto Fine-Techno Co., Ltd.), acetoalkoxyaluminum diisopropylate product name AL-M; Ajinomoto Fine-Techno Co., Ltd.) However, any one of them or a plurality of them may be selected for the surface treatment (surface modification treatment). Further, instead of the above-mentioned surface treatment (surface modification treatment), a coupling treatment using corona discharge or ion plasma discharge may be performed, and instead of the above-mentioned surface modification treatment, DLC treatment or Mo coating. May be performed. Particularly, the DLC treatment is preferable because it can reduce friction and improve wear resistance in the sliding portion.

[2.5. Specific Structure of Resin Thrust Washer 20]
(1) First Configuration Example of Resin Thrust Washer 20 Hereinafter, a specific configuration of the resin thrust washer 20 will be described. First, the resin thrust washer 20 according to the first configuration example will be described. As shown in FIG. 2, the resin-made thrust washer 20 is provided with a ring-shaped portion 21 so as to cover the insertion hole 22. An oil introduction groove 23 for introducing lubricating oil into the oil groove 25 is provided on the inner peripheral side (insertion hole 22 side) of the ring-shaped portion 21, and the oil introduction groove 23 is provided on the insertion hole 22 side. Is provided in a shape in which the inner peripheral wall is recessed from the outer peripheral side toward the outer peripheral side. That is, although a rotation shaft (not shown) is arranged in the insertion hole 22, if the oil introduction groove 23 does not exist, the supply of the lubricating oil along the rotation shaft is hindered, whereby the oil groove 25 is filled with the lubricating oil. There is a possibility that the supply may not be sufficient. However, the presence of the oil introduction groove 23 makes it possible to introduce the lubricating oil into the oil groove 25 satisfactorily.

Further, an oil scooping surface 24 is provided on the inner peripheral side of the ring-shaped portion 21 (the insertion hole 22 side). The oil scooping surface 24 is a portion that guides the lubricating oil introduced from the oil introducing groove 23 in the circumferential direction of the ring-shaped portion 21. The oil scooping surface 24 is formed by processing the inner peripheral side of the ring-shaped portion 21 into, for example, a tapered shape or a curved surface shape.

An oil groove 25 is provided in the ring-shaped portion 21. FIG. 3 is a plan view showing the configuration of the resin thrust washer 20 according to the first configuration example. As shown in FIG. 2 and FIG. 3, the oil groove 25 includes other members (the mating members C1 and C2, the other resin-made thrust washers 20 and the metal-made thrust washers 50) of the ring-shaped portion 21; It is provided so as to be recessed from the front surface and the back surface facing each other. In the following description, the front surface and the back surface of the ring-shaped portion 21 are referred to as the sliding surface 26. In the configuration shown in FIG. 2, an opening 27 that opens toward the insertion hole 22 is provided on the inner diameter side of the oil groove 25. Therefore, the lubricating oil is supplied to the oil groove 25 from the insertion hole 22 side.

On the other hand, the outer diameter side of the oil groove 25 does not communicate with the outer peripheral side of the resin thrust washer 20 (ring-shaped portion 21). That is, on the outer diameter side of the oil groove 25, the oil stop wall 28 that suppresses the lubricating oil from flowing out to the outer peripheral side is arranged. The oil stop wall 28 is flush with the sliding surface 26, but the oil stop wall 28 may be provided so as to have a slight difference in height with respect to the sliding surface 26.

Here, in the configuration shown in FIGS. 2 and 3, the two oil grooves 25 are connected on the opening 27 side, and the two oil grooves 25 are arranged so as to draw a V shape. In the following description, one of the oil grooves 25 that draws a V shape is referred to as a first oil groove 25a, and the other remaining one is referred to as a second oil groove 25b. In FIG. 2 and FIG. 3, the first oil groove 25a is provided so as to move clockwise from the inner diameter side toward the outer diameter side. On the other hand, the second oil groove 25b is provided so as to advance counterclockwise from the inner diameter side toward the outer diameter side. When it is not necessary to distinguish between the first oil groove 25a and the second oil groove 25b, the first oil groove 25a and the second oil groove 25b are simply referred to as the oil groove 25.

Here, the first oil groove 25a and the second oil groove 25b may be completely connected to each other on the opening 27 side, but may be slightly separated from each other.

Further, in FIG. 3, a center line L1 in the radial direction (width direction) of the ring-shaped portion 21 intersects with a center line L2 of the first oil groove 25a and the second oil groove 25b at an intersection position P1. The angle formed by the center line L2 with respect to the radial line L3 that passes through and extends along the radial direction is defined as an inclination angle α1. In FIG. 2, the inclination angle α1 is preferably in the range of 30 degrees to 55 degrees. The groove width of the oil groove 25 is preferably in the range of 1.8 mm to 2.8 mm. The groove depth of the oil groove 25 is preferably in the range of 0.5 mm to 1.0 mm. 2 and 3, the inclination angle on the first oil groove 25c side and the inclination angle on the second oil groove 25d side may have different values.

The width of the oil stop wall 28 is preferably within the range of 0.01 mm to 0.1 mm. It is difficult to make the width of the oil stop wall 28 smaller than 0.01 mm in terms of processing accuracy, and when the width of the oil stop wall 28 is made larger than 0.1 mm, the width of the oil stop wall 28 becomes smaller. This is because the sliding load greatly affects the resin-made thrust washer 20.

Moreover, the cross-sectional shape of the oil groove 25 is formed as shown in FIG. 4 in the first configuration example. In the configuration shown in FIG. 4, a pair of substantially S-shaped curved wall surfaces 252 are provided from the bottom portion 251 of the oil groove 25 toward the sliding surface 26 side. Therefore, the lubricating oil that has entered the oil groove 25 can be satisfactorily supplied to the sliding surface 26 on any of the pair of curved wall surfaces 252.

Further, as shown in FIG. 4, a curved wall surface 252 on the other side (X2 side in FIG. 4) is provided with a dynamic pressure guide wall surface 254 so as to be continuous. The dynamic pressure guide wall surface 254 is a portion for making it easier for the lubricating oil that has entered the oil groove 25 to be guided by the sliding surface 26. Therefore, the inclination angle θ1 (see FIG. 4) of the dynamic pressure guide wall surface 254 with respect to the sliding surface 26 is set to be significantly smaller than the inclination angle of the curved wall surface 252 with respect to the sliding surface 26. By guiding the lubricating oil toward the sliding surface 26 by the dynamic pressure guide wall surface 254, a pressure (dynamic pressure) due to the lubricating oil can be generated between the sliding surface 26 and other members. By the pressure (dynamic pressure), it becomes possible to reduce the sliding load with other members. In addition, the dynamic pressure guide wall surface 254 may have a portion that inclines in a curved shape other than the linear shape.

Here, in the first configuration example, a total of 12 sets of the first oil groove 25a and the second oil groove 25b that draw a V shape are provided. In the third configuration example, the fourth configuration example, the fifth configuration example, the sixth configuration example, and the eighth configuration example, which will be described later, similarly to the first configuration example, the first oil groove 25a that draws a V-shape and the first oil groove 25a A total of 12 sets of two oil grooves 25b are provided.

Here, in FIG. 3, the two-dot chain line shows the case where the rotational direction of the resin thrust washer 20 is clockwise, and also shows the flow of the lubricating oil at that time. When the resin-made thrust washer 20 rotates clockwise with respect to the lubricating oil existing on the insertion hole 22 side, the lubricating oil flowing into the oil groove 25 from the opening 27 is subjected to centrifugal force to generate the first oil. It is supplied to the sliding surface 26 mainly from the second oil groove 25b instead of the groove 25a. Further, in FIG. 3, the broken line shows the case where the rotation direction of the resin thrust washer 20 is counterclockwise, and also shows the flow of the lubricating oil at that time. When the resin thrust washer 20 rotates counterclockwise, the lubricating oil is mainly supplied to the sliding surface 26 from the first oil groove 25a instead of the second oil groove 25b due to the centrifugal force acting on the lubricating oil.

(2) Regarding Second Configuration Example of Resin Thrust Washer 20 Next, the resin thrust washer 20 according to the second configuration example will be described. FIG. 5 is a plan view showing the configuration of the resin thrust washer 20 according to the second configuration example. FIG. 6 is a cross-sectional view showing a state in which the oil groove 25 shown in FIG. 5 is cut along the width direction. Although the oil groove 25 according to the second configuration example has a cross-sectional shape along the width direction different from that of the oil groove 25 according to the first configuration example, in the resin-made thrust washer 20 according to the second configuration example, the oil groove The configuration other than the cross-sectional shape of 25 is common to the resin thrust washer 20 according to the first configuration example.

In the oil groove 25 according to the second configuration example shown in FIGS. 5 and 6, the taper wall surface 255 approaches the one side (X1 side in FIG. 6) from the bottom 251 of the oil groove 25. That is, the tapered wall surface 255 is continuous with one side of the bottom portion 251. The tapered wall surface 255 is a portion which is linearly inclined with a predetermined inclination angle with respect to the sliding surface 26. In addition, the tapered wall surface 255 may have a portion that inclines in a curved shape other than the linear shape. On the other hand, when it goes from the bottom portion 251 to the other side (X2 side in FIG. 6 ), it approaches the curved wall surface 252 like the oil groove 25 shown in FIG. 4 described above. That is, the curved wall surface 252 is continuous with the other side of the bottom portion 251. The width of the tapered wall surface 255 in the width direction (dimension c2) is set to be approximately four times the dimension a2.

Here, in the configuration in which the two oil grooves 25 are arranged so as to draw a V shape, as shown in FIG. 5, the tapered wall surface 255 is located on the inner diameter side of the curved wall surface 252 in the width direction of the oil groove 25. Is provided. As a result, when the resin-made thrust washer 20 rotates, the lubricating oil is supplied to the sliding surface 26 which is not surrounded by the two oil grooves 25. However, the tapered wall surface 255 may be provided so as to be located on the outer diameter side of the curved wall surface 252 in the width direction of the oil groove 25.

In the second configuration example, a total of six sets of the first oil groove 25a and the second oil groove 25b that draw a V shape are provided at equal intervals in the circumferential direction of the ring-shaped portion 21. However, any number of sets of the first oil groove 25a and the second oil groove 25b that draw a V shape may be provided.

(3) Third Example of Configuration of Resin Thrust Washer 20 Next, the resin thrust washer 20 according to the third configuration example will be described. FIG. 7 is a plan view showing the configuration of the resin thrust washer 20 according to the third configuration example. FIG. 8 is a sectional view showing a state in which the oil groove 25 shown in FIG. 7 is cut along the width direction. Although the oil groove 25 according to the third configuration example has a different planar shape from the oil groove 25 according to the first configuration example, in the resin-made thrust washer 20 according to the third configuration example, the cross-sectional shape of the oil groove 25. Is common to the resin thrust washer 20 according to the first configuration example. That is, in the oil groove 25 according to the third configuration example, similar to the oil groove 25 according to the first configuration example, the bottom portion 251 and the substantially S-shaped curve extending from the bottom portion 251 toward the sliding surface 26 side. A pair of wall surfaces 252 are provided. Also, in the oil groove 25 according to the third configuration example, the curved wall surface 252 on the other side (X2 side in FIG. 8) is provided so as to be continuous with the dynamic pressure guide wall surface 254 that is linearly inclined.

As shown in FIG. 7, the oil groove 25 is provided with a branched oil groove 110 in addition to the first oil groove 25a and the second oil groove 25b which are connected so as to draw a V shape. The branched oil groove 110 is an oil groove that is connected so as to branch from each of the first oil groove 25a and the second oil groove 25b. In the configuration shown in FIG. 7, the branched oil groove 110 is connected to the first oil groove 25a and the second oil groove 25b, respectively, so as to draw a lowercase letter "y" or vice versa. The outer diameter side of the branch oil groove 110 does not communicate with the outer peripheral side of the resin-made thrust washer 20 (ring-shaped portion 21), and like the oil groove 25, an oil stopper is provided on the outer diameter side of the branch oil groove 110. The wall 110a is arranged.

Further, in the configuration shown in FIG. 7, the branched oil groove 110 connected to the first oil groove 25a and the branched oil groove 110 connected to the second oil groove 25b have the same width. However, the widths of the two branched oil grooves 110 may be different from each other. For example, the branched oil groove 110 connected to the first oil groove 25a may be wider than the branched oil groove 110 connected to the second oil groove 25b, and vice versa. It may be. Further, on the outer diameter side of the branch oil groove 110, an oil stop wall 110 a that suppresses the lubricating oil from flowing out of the branch oil groove 110 from the outer peripheral side is provided. The width of the oil stop wall 110a can be set in the same manner as the width of the oil stop wall 28 described above.

(4) Fourth Structural Example of Resin Thrust Washer 20 Next, the resin thrust washer 20 according to the fourth structural example will be described. FIG. 9 is a plan view showing the configuration of the resin thrust washer 20 according to the fourth configuration example. FIG. 10 is a cross-sectional view showing a state in which the oil groove 25 shown in FIG. 9 is cut along the width direction. The oil groove 25 according to the fourth configuration example has a different planar shape from the oil groove 25 according to the first configuration example, but in the resin-made thrust washer 20 according to the fourth configuration example, the cross-sectional shape of the oil groove 25. The configuration excluding the vicinity is common to the resin thrust washer 20 according to the first configuration example.

Specifically, as shown in FIG. 10, the taper wall surface 255 approaches the one side (X1 side in FIG. 10) from the bottom portion 251 of the oil groove 25. That is, the tapered wall surface 255 is continuous with one side of the bottom portion 251. On the other hand, when going from the bottom portion 251 to the other side (X2 side in FIG. 10), it approaches the inclined wall portion 109a of the oil bank portion 109. That is, the inclined wall portion 109a is continuous with the other side of the bottom portion 251. Here, in the configuration shown in FIG. 10, the length of the tapered wall surface 255 in the width direction (dimension c4) is set to be approximately twice the dimension a4.

Further, the oil bank portion 109 is provided such that the height H41 from the bottom portion 251 is approximately the same as the height H42 of the sliding surface 26 from the bottom portion 251. The oil bank portion 109 is provided with a pair of inclined wall portions 109a and 109b with the top portion 109c interposed therebetween. As described above, the inclined wall portion 109a is an inclined wall located on the other side (X2 side) of the oil groove 25, and is inclined linearly. Further, the inclined wall portion 109b is an inclined wall located on the opposite side of the inclined wall portion 109a with the top portion 109c interposed therebetween, and is inclined linearly like the inclined wall portion 109a. As shown in FIG. 10, the inclined wall portion 109a is arranged on one side (X1 side) of the top portion 109c, and the inclined wall portion 109b is arranged on the other side (X2 side) of the top portion 109c. The inclined wall portions 109a and 109b are not limited to the linear shape, and may be provided in the curved shape.

In addition, the bottom 251 side of the inclined wall portion 109a and the surrounding portion 111 (described later) side of the inclined wall portion 109b are linearly provided. However, the tops 109c of the inclined wall portions 109a and 109b are curved.

Further, the top portion 109c is provided so as to be flat, but the width of the top portion 109c is extremely narrow as compared with the bottom portion 251, the curved wall surface 252, and the like. In this way, the width of the top portion 109c is extremely narrow, and therefore, even when the top portion 109c comes into contact with other members (other resin thrust washers 20, metal thrust washers 50, mating members C1, C2, etc.). , Are provided so as to be in line contact with each other. Explaining this point in detail, as shown in FIGS. 9 and 10, these two oil grooves 25 (two oil stop walls 28) are provided between the first oil groove 25a and the second oil groove 25b. The enclosed portion 111 is provided. As shown in FIG. 10, the height of the surrounding portion 111 is lower than that of the top portion 109c. Therefore, when the resin-made thrust washer 20 is rotated, even if the top portion 109c comes into contact with other members, the surrounding portion 111 does not come into contact with other members.

When the resin-made thrust washer 20 rotates, the lubricating oil that has passed over the top portion 109c covers the surrounding portion 111. Even if the lubricating oil covers the surrounding portion 111, the surrounding portion 111 does not come into contact with other members.

As described above, when the resin-made thrust washer 20 is rotated, the surrounding portion 111 having a low height may not come into contact with other members, while the top portion 109c may come into contact with other members. The sliding load can be reduced as compared with the configuration in which 111 does not exist. The height of the surrounding portion 111 may be the same as that of the bottom portion 251, or may be slightly higher or lower than that of the bottom portion 251. Further, when the resin-made thrust washer 20 rotates, the top portion 109c may come into contact with other members, but it is a matter of course that the top portion 109c does not come into contact with other members due to the presence of lubricating oil. ..

(5) Regarding Fifth Configuration Example of Resin Thrust Washer 20 Next, the resin thrust washer 20 according to the fifth configuration example will be described. FIG. 11 is a plan view showing the configuration of the resin-made thrust washer 20 according to the fifth configuration example. FIG. 12 is a sectional view showing a state in which the oil groove 25 shown in FIG. 11 is cut along the width direction. Although the oil groove 25 according to the fifth configuration example has a different planar shape from the oil groove 25 according to the first configuration example, in the resin-made thrust washer 20 according to the fifth configuration example, the oil groove 25 is Similar to the one configuration example, it has a bottom portion 251. Hereinafter, the difference between the resin-made thrust washer 20 according to the fifth configuration example and the resin-made thrust washer 20 according to the first to fourth configuration examples will be described.

As shown in FIG. 12, the resin-made thrust washer 20 according to the fifth configuration example is provided with a convex curved surface portion 256 similar to the substantially S-shaped curved wall surface 252. The convex curved surface portion 256 is a convex curved surface that connects the bottom portion 251 and the sliding surface 26, but unlike the substantially S-shaped curved wall surface 252, has a cross-sectional shape with no inflection point. In the configuration shown in FIG. 12, the convex curved surface portion 256 is provided in a shape equivalent to, for example, a chamfered round shape. However, in addition to the convex curved surface portion, the convex curved surface portion 256 may have, for example, a linear portion in part or a concave curved portion in part. Further, instead of the convex curved surface portion 256, a linear inclined surface equivalent to the tapered wall surface 255 may be provided.

In the configuration shown in FIG. 11, the oil groove 25 has a wide groove portion 257 and a narrow groove portion 258. The wide groove portion 257 and the narrow groove portion 258 are provided so as to be continuous on the same straight line. As shown in FIG. 11, the wide groove portion 257 is provided so as to be wider than the narrow groove portion 258. Further, the narrow groove portion 258 is connected to the opening portion 27, while the oil stop wall 28 exists on the inner side of the wide groove portion 257. Note that in the configuration shown in FIG. 11, the width of the wide groove portion 257 is set to be approximately 2 to 2.5 times the width of the narrow groove portion 258.

(6) Sixth Configuration Example of Resin Thrust Washer 20 Next, the resin thrust washer 20 according to the sixth configuration example will be described. FIG. 13 is a plan view showing the configuration of the resin thrust washer 20 according to the sixth configuration example. FIG. 14 is a cross-sectional view showing a state in which the oil groove 25 shown in FIG. 13 is cut along the width direction. In the resin-made thrust washer 20 according to the sixth configuration example, the oil groove 25 is different from the resin-made thrust washer 20 according to the first to fifth configuration examples, and the two oil grooves 25 are V-shaped. However, the oil groove 25 is arranged so as to extend in a direction inclined with respect to the radial direction. However, also in the resin thrust washer 20 according to the sixth configuration example, the two oil grooves 25 may be arranged so as to draw a V shape.

The oil groove 25 according to the sixth configuration example includes a bottom portion 251 and a dynamic pressure guide wall surface 254, similarly to the oil groove 25 according to the second configuration example. Further, the oil groove 25 according to the sixth configuration example includes the convex curved surface portion 256, similarly to the oil groove 25 according to the fifth configuration example. However, the resin thrust washer 20 according to the sixth configuration example is provided with the sliding projection 112 similar to the oil bank portion 109 when going from the bottom portion 251 to the other side (X2 side in FIGS. 13 and 14). There is. The sliding projection 112 is a portion for contacting the mating member C1 or C2 and smoothing the roughness on the surface of the mating member C1 or C2. Therefore, the sliding projection 112 has the same height as the sliding surface 26, or is provided so as to slightly project from the sliding surface 26. Instead of the convex curved surface portion 256, a linear inclined surface equivalent to the tapered wall surface 255 may be provided. Further, the sliding projection 112 may be provided slightly lower than the sliding surface 26.

Note that, as shown in FIGS. 13 and 14, from the bottom portion 251 toward the other side (X2 side in FIGS. 13 and 14), the inclined wall portion 112a of the sliding projection 112 approaches. That is, the inclined wall portion 112a is continuous with the other side of the bottom portion 251. Further, the top surface portion 112b of the sliding projection 112 is continuous with the inclined wall portion 112a. The top surface portion 112b is provided to be flat, like the top portion 109c. Further, a concave curved surface portion 113b described later is continuous with the top surface portion 112b.

Further, the resin thrust washer 20 according to the sixth configuration example is provided with a communication oil groove 113 from the sliding projection 112 toward the other side (X2 side in FIGS. 13 and 14). In the communication oil groove 113, the oil stop wall 28 does not exist on the outer diameter side of the ring-shaped portion 21, and the lubricating oil can freely flow from the insertion hole 22 to the outer diameter side. In the configurations shown in FIGS. 13 and 14, the communication oil groove 113 is provided so as to be recessed from the sliding surface 26 together with the oil groove 25. Further, in the configuration shown in FIGS. 13 and 14, the communication oil groove 113 is provided in a linear shape that is parallel to the oil groove 25. However, the communication oil groove 113 does not have to be parallel to the oil groove 25, and may be provided, for example, along the radial direction of the resin thrust washer 20. Further, the communication oil groove 113 may be provided in a curved shape instead of a straight shape.

The bottom 113a of the communication oil groove 113 is provided at the same height as the bottom 251. However, the height of the bottom 113a may be slightly different from the height of the bottom 251. .. Further, as shown in FIG. 14, the bottom portion 113a is continuously provided on the pair of concave curved surface portions 113b and 113c. Among these, the concave curved surface portion 113b is provided on one side (X1 side in FIG. 14) of the bottom portion 113a, and the concave curved surface portion 113c is provided on the other side (X2 side in FIG. 14) of the bottom portion 113a. ing. The concave curved surface portions 113b and 113c are concave curved surfaces that connect the bottom portion 113a and the sliding surface 26, and have a cross-sectional shape that does not have an inflection point, unlike the substantially S-shaped curved wall surface 252. Note that in the configuration shown in FIG. 14, the concave curved surface portions 113b and 113c are provided in the same shape as, for example, a chamfered round shape. However, the concave curved surface portions 113b and 113c may have, for example, a linear portion other than the curved portion. Further, the bottom 113a may or may not have a curved portion.

When such a communication oil groove 113 is provided, the flow rate of the lubricating oil passing through the communication oil groove 113 toward the outer diameter side can be increased. Therefore, it becomes possible to improve the heat dissipation of the resin thrust washer 20.

(7) Seventh Configuration Example of Resin Thrust Washer 20 Next, the resin thrust washer 20 according to the seventh configuration example will be described. The resin-made thrust washer 20 according to the seventh configuration example is provided with an oil groove 25 similar to that of the resin-made thrust washer 20 according to the second configuration example described above, and the similar oil groove 25 has a bottom portion 251. There is a curved wall surface 252 and a tapered wall surface 255 that are substantially S-shaped. Therefore, its illustration is omitted. However, in the seventh configuration example, a total of eight sets of the first oil groove 25a and the second oil groove 25b that draw a V shape are provided at equal intervals in the circumferential direction of the ring-shaped portion 21. This point is different from the second configuration example in which a total of six sets of the first oil groove 25a and the second oil groove 25b are provided in the ring-shaped portion 21.

(8) Eighth Configuration Example of Resin Thrust Washer 20 Next, the resin thrust washer 20 according to the eighth configuration example will be described. FIG. 15 is a plan view showing the configuration of the resin thrust washer 20 according to the eighth configuration example. 16 is a cross-sectional view showing a state in which the oil groove 25 shown in FIG. 15 is cut along the width direction.

In the resin thrust washer 20 according to the eighth configuration example, the first oil groove 25a and the second oil groove 25b are provided with short lengths. Therefore, there is a sufficient distance between the inner side of the first oil groove 25a and the second oil groove 25b (the side away from the opening 27) and the outer peripheral edge of the resin thrust washer 20.

In addition to the oil groove 25, an oil sump groove 114 is provided in the resin-made thrust washer 20 according to the eighth configuration example. The oil sump groove 114 is a concave portion in which the opening 27 does not exist on the inner diameter side. In the configuration shown in FIG. 15, two oil sump grooves 114 are provided. These two oil sump grooves 114 are connected on the inner diameter side so as to draw a V shape. However, the oil sump groove 114 does not have to be arranged so as to draw a V shape. In the following description, one of the V-shaped oil sump grooves 114 will be referred to as a first oil sump groove 114a and the other will be referred to as a second oil sump groove 114b. The first oil sump groove 114a is provided so as to move clockwise from the inner diameter side toward the outer diameter side. On the other hand, the second oil sump groove 114b is provided so as to advance counterclockwise from the inner diameter side toward the outer diameter side.

Further, in the eighth configuration example, the oil groove 25 and the oil sump groove 114 have the same cross-sectional shape. Specifically, when it goes from the bottom portion 251 of the oil groove 25 to one side (X1 side in FIG. 16), it approaches the curved wall surface 252 having a substantially S-shape. That is, a substantially S-shaped curved wall surface 252 is continuous with one side of the bottom portion 251. In this curved wall surface 252, a concave curved surface portion 259 which is a concave curved surface is continuously provided on the bottom portion 251, and a convex curved surface portion 256 which is a convex curved surface is continuous with the concave curved surface portion 259. It is provided. Further, a dynamic pressure guide wall surface 254 is provided between the convex curved surface portion 256 and the sliding surface 26 so as to be continuous with them. Instead of the convex curved surface portion 256, a linear inclined surface equivalent to the tapered wall surface 255 may be provided.

On the other hand, when going from the bottom portion 251 to the other side (X2 side in FIG. 16), the concave curved surface portion 260 is provided continuously to the bottom portion 251. Further, the concave curved surface portion 260 is continuously provided with an inclined wall portion 261 that is linearly inclined. It should be noted that the sliding surface 26 is approached from the inclined wall portion 261 toward the other side (X2 side in FIG. 16). Further, the inclined wall portion 261 may be provided in a curved shape. Further, the inclined wall portion 261 may have a curved portion.

Further, similar to the oil groove 25 described above, when going from the bottom 115 (see FIG. 15) of the oil sump groove 114 to one side in the width direction, a concave curved surface portion (not shown) and a convex curved surface similar to the concave curved surface portion 259 are formed. The sliding surface 26 is approached via a convex curved surface portion (not shown) similar to the portion 256 and a dynamic pressure guide wall surface 116 (see FIG. 15) similar to the dynamic pressure guide wall surface 254. Further, when moving from the bottom portion 115 to the other side in the width direction, the sliding surface 26 passes through a concave curved surface portion (not shown) similar to the concave curved surface portion 260 and an inclined wall portion (not shown) similar to the inclined wall portion 261. Approach. Instead of the convex curved surface portion similar to the convex curved surface portion 256, a linear inclined surface equivalent to the inclined wall portions 109a and 109b may be provided.

[2.6. Regarding Evaluation (Experimental Results) Regarding Shape of Oil Groove 25 of Resin Thrust Washer 20 According to First to Eighth Configuration Example]
Next, an experiment was conducted on the sliding load of the resin-made thrust washers 20 according to the above-described first to eighth configuration examples. That is, an experiment was conducted to determine which resin thrust washer 20 was used to reduce the sliding load. The experimental results will be described below.

In the first configuration example (see FIG. 4 ), the dimension a1 corresponding to the width of the bottom portion 251 is 0.5 mm, the dimension b1 corresponding to the width of the oil groove 25 is 1.0 mm, and the width of the dynamic pressure guide wall surface 254. Is 0.5 mm, the inclination angle θ1 of the dynamic pressure guide wall surface 254 with respect to the sliding surface 26 is 3 degrees, and the height H1 from the bottom 251 to the sliding surface 26 is 0.25 mm. In the second configuration example (see FIG. 6), the dimension a2 corresponding to the width of the bottom portion 251 is 0.5 mm, the dimension c2 corresponding to the width of the tapered wall surface 255 is 2.25 mm, and the other side (X2 in FIG. 6). The dimension d2 corresponding to the width of the curved wall surface 252 (on the side) is 0.2 mm, and the height H2 from the bottom 251 to the sliding surface 26 is 0.25 mm. Further, in the third configuration example (see FIG. 8), the dimension a3 corresponding to the width of the bottom portion 251 is 1.0 mm, the dimension b3 corresponding to the width of the oil groove 25 is 1.5 mm, and the width of the dynamic pressure guide wall surface 254. Is 0.5 mm, the inclination angle θ3 of the dynamic pressure guide wall surface 254 with respect to the sliding surface 26 is 3 degrees, and the height H3 from the bottom 251 to the sliding surface 26 is 0.25 mm.

In the fourth configuration example (see FIG. 10), the dimension a4 corresponding to the width of the bottom portion 251 is 0.5 mm, the dimension c4 corresponding to the width of the tapered wall surface 255 is 1.0 mm, and the width of the top portion 109c. The dimension f4 is 0.05 mm, the height H41 from the bottom portion 251 to the top portion 109c is 0.25 mm, the height H42 from the bottom portion 251 to the sliding surface 26 is 0.25 mm, and the inclined wall portions 109a and 109b are inclined with respect to the bottom portion 251. The angles θ41 and θ42 are 45 degrees, and the curved surface between the inclined wall portions 109a and 109b and the top portion 109c is R0.3. In the fifth configuration example (see FIG. 12 ), the dimension a5 corresponding to the width of the bottom portion 251 is 0.5 mm, the dimension b5 corresponding to the width of the oil groove 25 is 2.0 mm, and the sliding surface 26 from the bottom portion 251. The height H5 is 0.25 mm, and the curved surface of the convex curved surface portion 256 is R2.

Further, in the sixth configuration example (see FIG. 14), the dimension a6 corresponding to the width of the bottom portion 251 is 0.5 mm, the dimension b6 corresponding to the width of the oil groove 25 is 1.8 mm, and the width of the dynamic pressure guide wall surface 254. Is 2.0 mm, the dimension e6 corresponding to the width of the top surface portion 112b is 0.2 mm, the dimension f6 corresponding to the width of the communication oil groove 113 is 0.7 mm, and the width direction of the inclined wall portion 112a (X Direction g) is 0.2 mm, the height H6 from the bottom portion 251 and the bottom portion 113a to the sliding surface 26 and the top surface portion 112b is 0.2 mm, and the inclination angle θ6 of the dynamic pressure guide wall surface 254 with respect to the sliding surface 26 is 3 mm. The convex curved surface portion 256 has a curved surface of R0.7, and the concave curved surface portions 113b and 113c have a curved surface of R0.2.

In the eighth configuration example (see FIG. 16), the dimension a8 corresponding to the width of the bottom portion 251 is 0.8 mm, the dimension b8 corresponding to the width of the oil groove 25 is 1.3 mm, and the width of the dynamic pressure guide wall surface 254. Corresponds to 1.0 mm, the inclination angle θ8 of the dynamic pressure guide wall surface 254 with respect to the sliding surface 26 is 6 degrees, and the height H8 from the bottom 251 to the sliding surface 26 is 0.25 mm. The curved surface of the concave curved surface portion 259 is R0.3, the curved surface of the convex curved surface portion 256 is R0.3, and the curved surface of the concave curved surface portion 260 is R0.3.

In all the resin thrust washers 20 according to the first to eighth configuration examples having such dimensions, the outer diameter thereof is 73 mm, the inner diameter thereof is 59 mm, and the thickness thereof is 1.5 mm. Further, the resin-made thrust washer 20 is manufactured by using a product name 150FC30 (manufactured by Victorex Co., Ltd.) made of polyetherketone resin (PEK). Further, the resin-made thrust washer 20 is not surface-treated. The mating members C1 and C2 are made of high-strength steel S45C (JIS standard), the diameter thereof is 73 mm, and the surface roughness thereof is Rz 6 μm. ATF was used as the lubricating oil, and the oil temperature during the experiment was 120 degrees. In addition, during the experiment, the load was 360 N, the rotation speed was 5200 rpm, and the oil flow rate was 1000 cc/min.

Further, the resin-made thrust washer 20 was measured for sliding load by using a load measuring device 300 as shown in FIG. The load measuring device 300 includes a cylindrical oil pan 301, and the above-described lubricating oil is supplied to an inner cylinder portion 301a of the oil pan 301. The oil pan 301 is also provided with an oil outlet 301b. The oil discharge port 301b is an opening for discharging the lubricating oil existing in the inner cylinder portion 301a to the outside.

The load measuring device 300 also includes a fixed shaft 302 and a rotating shaft 303. The fixed shaft 302 is a shaft that does not rotate relative to the oil pan 301. However, a load in the pressing direction is applied to the fixed shaft 302 by a load supply unit (not shown). The mating member C2 is attached to the fixed shaft 302 in a non-rotating state with respect to the fixed shaft 302.

The rotating shaft 303 is a shaft that rotates with respect to the oil pan 301. Therefore, the rotating shaft 303 is supplied with a rotating driving force from a rotating force supply means (not shown). The mating member C1 is attached to the rotating shaft 303 in a non-rotating state with respect to the rotating shaft 303. In addition, one mating member C1 is provided with a shaft-shaped portion C1a for attaching the resin thrust washer 20. On the other hand, the other mating member C2 is provided in a disc shape. Therefore, the axial dimension of one mating member C1 is set larger than that of the other mating member C2 by the amount of the shaft-shaped portion C1a.

In addition, as shown in FIG. 17, a central hole is provided so as to penetrate through each of the fixed shaft 302, the mating member C1 and the other mating member C2 (reference numerals are omitted). Then, the center holes are continuous in the axial direction to form the oil supply passage 304 through which the lubricating oil flows. The fixed shaft 302 is formed with an oil supply port 302a which is an opening portion for supplying lubricating oil to the oil supply passage 304. A thermocouple 305 is attached to the mating material C2. The thermocouple 305 is a part for measuring the sliding surface temperature of the mating material C2. An oil seal 306 is provided at an opening portion (reference numeral omitted) for inserting the fixed shaft 302 into the inner cylinder portion 301a of the oil pan 301. An oil seal 307 is also provided in an opening portion of the oil pan 301 for inserting the rotating shaft 303 into the inner cylinder portion 301a.

FIG. 18 shows the result of an experiment conducted by mounting the resin-made thrust washers 20 according to the first to eighth configuration examples on the load measuring device 300. In FIG. 18, the resin thrust washer 20 according to the first configuration example has an average torque (sliding load; the same applies hereinafter) of 0.35 N·m, and the resin thrust washer 20 according to the second configuration example has an average torque of 0. .3 N·m, the resin thrust washer 20 according to the third configuration example has an average torque of 0.33 N·m, and the resin thrust washer 20 according to the fourth configuration example has an average torque of 0.27 N·m, the fifth configuration. The resin-made thrust washer 20 according to the example has an average torque of 0.27 N·m, the resin-made thrust washer 20 according to the sixth configuration example has an average torque of 0.37 N·m, and the resin-made thrust washer 20 according to the seventh configuration example. The average torque was 0.34 N·m, and the average torque was 0.37 N·m in the resin thrust washer 20 according to the eighth configuration example.

From the results of this experiment, the result is that the resin-made thrust washer 20 having the smallest sliding load is the resin-made thrust washer 20 according to the fourth configuration example as shown in FIGS. 9 and 10.

[3. Specific Structure of Metal Thrust Washer 50]
Next, the configuration of the metal thrust washer 50 will be described. FIG. 19 is a plan view showing the configuration of the metal thrust washer 50. As shown in FIG. 19, the metal-made thrust washer 50 is also provided with a ring-shaped portion 201 so as to cover the insertion hole 202, similarly to the resin-made thrust washer 20 described above. However, the ring-shaped portion 201 does not have a portion such as the oil groove 25 existing in the resin-made thrust washer 20. That is, the sliding surface 203 such as the front surface or the back surface of the ring-shaped portion 201 of the metallic thrust washer 50 is provided smoothly without any groove such as an oil groove.

At least one of the oil introduction groove and the oil scooping surface may be present on the inner peripheral side of the metal thrust washer 50, like the resin thrust washer 20 described above, and both are present. You don't have to.

Further, the metal thrust washer 50 has a smaller thickness than the resin thrust washer 20. Thereby, it is possible to reduce the overall thickness of the combined thrust washer 10 including the three thrust washers including the metal thrust washer 50. However, the thickness of the metal thrust washer 50 may be approximately the same as the thickness of the resin thrust washer 20.

Examples of the material of the metal thrust washer 50 include materials having good thermal conductivity such as copper and iron. The metal thrust washer 50 may be made of an aluminum alloy depending on the resin to be slid (combined) (for example, polyamideimide resin (PAI) or polyetherimide resin (PEI)). Further, the metal thrust washer 50 may be subjected to a surface treatment such as DLC or Mo coating.

[4. About the combination of thrust washer S1]
Next, the combined thrust washer 10 having at least one resin thrust washer 20 according to the above-described first to eighth configuration examples will be described.

[4.1. Principle of combination]
First, the basic principle that constitutes the combined thrust washer 10 will be described. Specifically, any number of thrust washers S1 constituting the combined thrust washer 10 may be used as long as they are two or more. However, it is necessary that at least one resin-made thrust washer 20 be present in the two or more thrust washers S1.

For example, when the combined thrust washer 10 is composed of two or more thrust washers S1, the thrust washer S1 is arranged on one mating member C1 side and the thrust washer S2 is arranged on the other mating member C2 side. Consider the case. At this time, one mating member C1 and the other mating member C2 are in a state of relatively rotating. In this case, the thrust washer S1 rotates relative to one of the mating members C1 or does not rotate relative to it. Further, the thrust washer S2 rotates relative to the other mating member C2, or is in a state in which it does not rotate relative to the other mating member C2.

In this state, at least one of the thrust washer S1 and the thrust washer S2 is the resin-made thrust washer 20, and the oil groove 25 is formed on at least one of the front surface and the back surface of the resin-made thrust washer 20. It is said that Then, the lubricating oil is supplied between the members (one of the mating members C1 and C2 and the thrust washers S1 and S2) facing the sliding surface 26 where the oil groove 25 exists.

Note that the manner of supplying the lubricating oil to the facing portion differs depending on the specific shape of the oil groove 25 and the like. However, one reference example of the supply of the lubricating oil is shown in FIG. In FIG. 3, the lubricating oil is introduced into the oil groove 25 through the opening 27, and the lubricating oil is supplied from the oil groove 25 to the facing portion including the sliding surface 26.

On the other hand, as a comparison target, consider a case where only one resin thrust washer 20 is arranged between the mating members C1 and C2. Also in this case, the sliding load can be significantly reduced as compared with the case where the resin thrust washer 20 is not arranged between the mating members C1 and C2. Here, when only one resin thrust washer 20 is used, the rotation difference between the mating member C1 and the mating member C2 is N, and the rotation between the surface of the resin thrust washer 20 and the mating member C1. The difference is N11. Further, the rotation difference between the back surface of the resin thrust washer 20 and the mating member C2 is N21. In the following description, N11 and N21 are also referred to as distribution terms.
In this case, the rotation difference N is expressed by the following equation.
N=N11+N21 (Equation 1)

On the other hand, consider a case where the thrust washer S1 of the two thrust washers S1 and S2 is the resin-made thrust washer 20 and the resin-made thrust washer 20 faces the mating member C1. In this case, the rotation difference between the mating members C1 and C2 is N, and the rotation difference between the surface of the resin thrust washer 20 and the mating member C1 is N12. Further, the rotation difference between the back surface of the resin thrust washer 20 and the front surface of the thrust washer S2 is N22, and the rotation difference between the back surface of the thrust washer S2 and the mating member C2 is N32. In this case, the rotation difference N is expressed by the following equation. In addition, in the following description, N12, N22, and N32 are also described as distribution terms.
N=N12+N22+N32 (Equation 2)

As is clear from the comparison between (Equation 1) and (Equation 2), the rotation difference N between the mating material C1 and the mating material C2 is distributed to two distribution terms such as “N11+N21”. If the rotation difference N between the material C1 and the mating material C2 is distributed to three distribution terms such as "N12+N22+N32", the rotation difference that each distribution term can handle can be reduced. Therefore, (Formula 2) can reduce the sliding load based on each distribution term rather than (Formula 1).

Moreover, the mating members C1 and C2 have a larger surface roughness than the thrust washers S1 and S2 (including the resin-made thrust washer 20) when the predetermined surface treatment is not performed. In this case, in (Equation 1), the sum of the sliding loads based on the distribution terms N12, N22, N32 in (Equation 2) (total sliding load) is the distribution terms N11, N21 in (Equation 1). It is possible to reduce the sliding load based on the total value (total sliding load). In other words, it is possible to reduce the relative rotation difference of the surface facing the surface having a large surface roughness, thereby reducing the overall sliding load.

In addition, when the three thrust washers S1 to S3 are used, there are four distribution terms. In this case, it is possible to further reduce the relative rotation difference between the surfaces facing each other with respect to the surface having a large surface roughness, and thus it is possible to further reduce the overall sliding load. Further, when four or more P thrust washers are used, the number of distribution terms is P+1. In this case, it is possible to further reduce the relative rotation difference between the surface facing the surface having a large surface roughness, and thus it is possible to further reduce the overall sliding load.

[4.2. Outline of Combination of Sliding Surface 26 in Which Oil Groove 25 Exists when Combined Thrust Washer 10 is Composed of Three Thrust Washers S1 to S3
When the combined thrust washer 10 is composed of three thrust washers S1 to S3, all of them can be resin thrust washers 20, or two can be resin thrust washers 20. Therefore, it is possible to use only one resin thrust washer 20. Further, in the resin-made thrust washer 20, it is possible to form the oil groove 25 on both the front surface and the back surface, and the oil groove 25 is formed only on either the front surface or the back surface of the resin-made thrust washer 20. It is also possible to do so.

Further, as the resin-made thrust washer 20 constituting the combined thrust washer 10, any one of the above-described first configuration example to eighth configuration example may be used.

Here, when three resin-made thrust washers 20 are used, there are a total of six front and back surfaces. Therefore, there are a total of 63 combinations in which at least one oil groove 25 exists in at least one resin thrust washer 20 and in at least one of the front surface and the back surface including the resin thrust washer 20. .. Therefore, the combination thrust washer 10 may be any of the 63 combinations described above.

[4.3. When the combined thrust washer 10 is composed of three resin thrust washers 20]
In the following, when the combined thrust washer 10 is composed of the three resin-made thrust washers 20, an experiment was conducted on a suitable combination of the sliding surfaces 26 in which the oil grooves 25 are present. The experimental results will be described below.

That is, with respect to the combined thrust washer 10 including the three resin-made thrust washers 20, among the above-mentioned 63 combinations in total, preferred candidates for the combined thrust washer 10 are selected, and an experiment is performed on these candidates. It was The results will be described below. In this experiment, all the oil grooves 25 have the same shape (the same configuration example). This is because it is unclear how it is preferable to dispose the oil grooves 25 on the three resin thrust washers 20 and their front and back surfaces unless experiments are performed with the same shape. Specifically, when the oil groove 25 is provided in the resin thrust washer 20, the oil groove 25 of the resin thrust washer 20 according to the first configuration example is provided. The arrangement of the oil groove 25 is shown in FIGS. 20 to 24.

20 to 24, the surface on which the oil groove 25 is provided is indicated by the symbol "Y" and is hatched. On the other hand, a reference numeral "N" is added to the surface where the oil groove 25 is not provided, but hatching is not applied. 20 to 24, the mating member C1 side will be described as the upper side (Z1 side), and the mating member C2 side will be described as the lower side (Z2 side).

The resin-made thrust washer 20 according to the first configuration example used in this experiment has the same dimensions as those used in the experiment shown in FIG. The experimental conditions in this experiment are the same as those in the experiment shown in FIG. The load measuring device 300 also uses the one shown in FIG. However, in the resin thrust washer 20, one resin thrust washer 20 is set in the load measuring device 300 in FIG. 17, but in this experiment, three resin thrust washers 20 are set in the load measuring device 300. Is set to.

(1) Arrangement of Oil Groove 25 in Combination Thrust Washer 10 According to First Combination Pattern FIG. 20 is a schematic diagram of the combination thrust washer 10 according to the first combination pattern. In the combined thrust washer 10 according to the first combination pattern, the oil grooves 25 are arranged on all the front and back surfaces of the three resin thrust washers 20.

(2) Arrangement of Oil Groove 25 in Combination Thrust Washer 10 According to Second Combination Pattern FIG. 21 is a schematic diagram of the combination thrust washer 10 according to the second combination pattern. In the combination thrust washer 10 according to the second combination pattern, the oil groove 25 is not arranged on the front surface and the back surface of the central resin thrust washer 20 among the three resin thrust washers 20, and the other two Oil grooves 25 were arranged on the front and back surfaces of the resin thrust washer 20.

(3) Arrangement of Oil Groove 25 in Combination Thrust Washer 10 According to Third Combination Pattern FIG. 22 is a schematic diagram of the combination thrust washer 10 according to the third combination pattern. In the combination thrust washer 10 according to the third combination pattern, the oil groove 25 is not arranged on the front surface and the back surface of the central resin thrust washer 20 among the three resin thrust washers 20. Further, the oil groove 25 is not arranged on the surface (Z1 side surface) of the resin thrust washer 20 on the upper side (Z1 side; mating member C1 side), but the oil groove 25 is arranged on the back surface (Z2 side surface). .. Further, the oil groove 25 is arranged on the front surface (Z1 side surface) of the resin thrust washer 20 on the lower side (Z2 side; mating member C2 side), and the oil groove 25 is arranged on the back surface (Z2 side surface). I lost it.

(4) Arrangement of Oil Groove 25 in Combined Thrust Washer 10 According to Fourth Combination Pattern FIG. 23 is a schematic diagram of the combined thrust washer 10 according to the fourth combination pattern. In the combination thrust washer 10 according to the fourth combination pattern, the oil groove 25 is arranged on the front surface and the back surface of the central resin thrust washer 20 among the three resin thrust washers 20. Further, the oil groove 25 is arranged on the front surface (Z1 side surface) of the resin thrust washer 20 on the upper side (Z1 side; mating member C1 side), and the oil groove 25 is not arranged on the back surface (Z2 side surface). And Further, the oil groove 25 is not arranged on the front surface (Z1 side surface) of the resin thrust washer 20 on the lower side (Z2 side; mating member C2 side), and the oil groove 25 is arranged on the back surface (Z2 side surface). did.

(5) Arrangement of Oil Groove 25 in Combination Thrust Washer 10 According to Fifth Combination Pattern FIG. 24 is a schematic view of the combination thrust washer 10 according to the fifth combination pattern. In the combined thrust washer 10 according to the fifth combination pattern, the oil groove 25 is arranged on the front surface and the back surface of the central resin thrust washer 20 among the three resin thrust washers 20. In addition, the oil groove 25 was not arranged on the front surface (Z1 side surface) and the back surface (Z2 side surface) of the resin-made thrust washer 20 on the upper side (Z1 side; mating member C1 side). Further, the oil grooves 25 were not arranged on the front surface (Z1 side surface) and the back surface (Z2 side surface) of the resin thrust washer 20 on the lower side (Z2 side; mating member C2 side).

[4.4. Regarding Evaluation (Experimental Results) of Combination Thrust Washer 10 According to First to Fifth Combination Patterns]
FIG. 25 shows the result of an experiment conducted by setting the combination thrust washers 10 according to the first to fifth combination patterns in the above load measuring device 300, respectively. In FIG. 25, the combined thrust washer 10 according to the first combination pattern has an average torque (sliding load; the same applies hereinafter) of 0.34 N·m, and the combined thrust washer 10 according to the second combination pattern has an average torque of 0. 32 N·m, the combined thrust washer 10 according to the third combination pattern has an average torque of 0.28 N·m, and the combined thrust washer 10 according to the fourth combination pattern has an average torque of 0.26 N·m and the fifth combination pattern. The combined thrust washer 10 had an average torque of 0.35 N·m.

From this experimental result, when the three resin thrust washers 20 are used, the combined thrust washer 10 with the smallest sliding load is the combined thrust washer 10 according to the fourth combination pattern as shown in FIG. It became a result.

In addition, the above-described experiment is performed on the resin-made thrust washer 20 provided with the oil groove 25 of the same shape (the oil groove 25 according to the first configuration example). Therefore, in the above-described first to fifth combination patterns, even if the oil grooves 25 according to the second to eighth configuration examples are applied so that the resin thrust washers 20 have the same shape, the same result is obtained. Is considered.

[4.5.3 When the combined thrust washer 10 is composed of the three thrust washers S1 and S2, and the central thrust washer S2 is the metal thrust washer 50]
Next, an experiment was conducted on the sliding load of the case where the resin thrust washer 20 at the center was replaced with the metal thrust washer 50 in the case where three resin thrust washers 20 were combined. The experimental results are described below.

(1) Arrangement of Oil Groove 25 in Combination Thrust Washer 10 According to Sixth Combination Pattern FIG. 26 is a schematic view of the combination thrust washer 10 according to the sixth combination pattern. In the combined thrust washer 10 according to the sixth combination pattern, the metallic thrust washer 50 is arranged at the center of the arrangement. Further, the oil groove 25 is not arranged on the surface (Z1 side surface) of the resin thrust washer 20 on the upper side (Z1 side; mating member C1 side), but the oil groove 25 is arranged on the back surface (Z2 side surface). .. Further, the oil groove 25 is arranged on the front surface (Z1 side surface) of the resin thrust washer 20 on the lower side (Z2 side; mating member C2 side), and the oil groove 25 is arranged on the back surface (Z2 side surface). I lost it. At this time, the two resin thrust washers 20 are provided with oil grooves 25 having a shape according to the first configuration example as shown in FIGS. 3 and 4.

(2) Arrangement of Oil Groove 25 in Combination Thrust Washer 10 According to Seventh Combination Pattern In the combination thrust washer 10 according to the seventh combination pattern, the shape of the oil groove 25 is different from that of the combination thrust washer 10 according to the sixth combination pattern. Only changed. Specifically, in the combined thrust washer 10 according to the seventh combination pattern, the resin thrust washer 20 is provided with the oil groove 25 having the shape according to the fourth configuration example as shown in FIGS. 9 and 10. There is.

In the combined thrust washer 10 according to the seventh combination pattern, the resin-made thrust washer 20 and the metallic thrust washer 50 have the same arrangement as the combined thrust washer 10 according to the above-described sixth combination pattern. The surface of the two resin-made thrust washers 20 on which the oil groove 25 is formed is similar to that of the resin-made thrust washer 20 as shown in FIG. Therefore, the illustration of the seventh combination pattern alone is omitted.

[4.6. Regarding Evaluation (Experimental Results) of the Combination Thrust Washer 10 According to the Sixth and Seventh Combination Patterns]
FIG. 27 shows the result of an experiment performed by setting the combination thrust washers 10 according to the sixth and seventh combination patterns in the load measuring device 300 described above. Note that, in FIG. 27, the combination thrust washers 10 according to the third combination pattern and the fourth combination pattern are also placed as a comparison target of the combination thrust washers 10 according to the sixth combination pattern and the seventh combination pattern.

In FIG. 27, in the combined thrust washer 10 according to the sixth combination pattern, the average torque (sliding load; the same applies hereinafter) is 0.27 N·m, and in the combined thrust washer 10 according to the seventh combination pattern, the average torque is 0. It was 23 N·m.

From this experimental result, when the three thrust washers S1 to S3 are used, the result is that the combined thrust washer 10 with the smallest sliding load is the combined thrust washer 10 according to the seventh pattern.

[5. Action effect]
In the combined thrust washer 10 configured as described above, the thrust washer is provided with the resin-made thrust washer 20 made of at least one resin, and the resin-made thrust washer 20 has the ring-shaped portion 21. Is provided with a sliding surface 26 that slides with other members (counterpart materials C1, C2 and other thrust washers) on the front and back surfaces of the same, and at least one of the front surface and the back surface is recessed from the sliding surface 26 and lubricating oil is provided. An oil groove 25 that enters is provided. An opening 27 recessed from the sliding surface 26 exists in the oil groove 25 at the inner peripheral end of the ring-shaped portion 21, and the presence of the opening 27 allows the lubricating oil to enter from the insertion hole 22 side, An oil stop wall 28 that separates the oil groove 25 and the outside of the ring-shaped portion 21 is provided at the outer peripheral end of the ring-shaped portion 21. The position of this oil stop wall 28 in the thickness direction is provided at the same position as the sliding surface 26, and the lubricating oil that has entered the oil groove 25 due to the presence of the oil stop wall 28 is on the outer peripheral side of the ring-shaped portion 21. Suppress the outflow.

Therefore, the lubricating oil that has entered the oil groove 25 is suppressed by the oil stop wall 28 from flowing out to the outer peripheral side of the resin-made thrust washer 20. Therefore, on the surface side of the resin-made thrust washer 20 where the oil groove 25 exists, an oil film of lubricating oil can be easily formed between the resin-made thrust washer 20 and other members (the mating members C1 and C2 and other thrust washers). It will be possible. Therefore, it is possible to reduce the sliding load between the surface side of the resin-made thrust washer 20 where the oil groove 25 is present and other members (the mating members C1 and C2 and other thrust washers).

Further, by providing a plurality of thrust washers, it becomes possible to slide between the thrust washers. Therefore, it is possible to relatively reduce the rotation difference between the thrust washer and the mating members C1 and C2, or to make the rotation difference non-existent, which also makes it possible to reduce the sliding load. Become.

In addition, in the present embodiment, the oil groove 25 includes a first oil groove 25 a that is inclined to one side with respect to the radial direction of the ring-shaped portion 21 and one side with respect to the radial direction of the ring-shaped portion 21. A second oil groove 25b that is inclined to the other side different from is provided, and the first oil groove 25a and the second oil groove 25b are connected by an opening 27.

In this way, the first oil groove 25a and the second oil groove 25b are respectively inclined to the one side and the other side with the radial direction sandwiched therebetween. Therefore, on the surface side of the resin-made thrust washer 20 where the oil groove 25 exists, even if the resin-made thrust washer 20 rotates clockwise or counterclockwise, the other members (the mating members C1, C2 and other members) are rotated. It is possible to easily form an oil film of lubricating oil between the thrust washer and the thrust washer. Therefore, between the surface side of the resin-made thrust washer 20 where the oil groove 25 is present and other members (the mating members C1, C2 and other thrust washers), the resin-made thrust washer 20 can rotate regardless of the rotating direction. It is possible to reduce the sliding load.

Further, in the present embodiment, the thrust washer is provided with at least one metal thrust washer 50 made of metal. Here, the metal thrust washer 50 can be made thinner than the resin thrust washer 20. Therefore, it is possible to reduce the overall thickness of the combined thrust washer 10.

Further, in the present embodiment, three thrust washers are provided, and the oil groove 25 is provided on the front surface and the back surface of the ring-shaped portion 21 of the thrust washer arranged at the center of the arrangement of the three thrust washers. The smooth sliding surfaces 26 and 203 are provided in the state where no ridge is formed.

Even with such a configuration, it is possible to reduce the sliding load.

Further, in the present embodiment, the thrust washers arranged at one end side and the other end side of the array of thrust washers are resin-made thrust washers 20. At the same time, an oil groove 25 is provided on the surface of the resin-made thrust washers 20 arranged at one end side and the other end side of the array of thrust washers, which faces the thrust washer arranged at the center of the array. ing.

Therefore, the surface of the resin-made thrust washer 20 in which the oil groove 25 exists and the smooth sliding surfaces 26, 203 of the thrust washer in which the oil groove 25 is not formed face each other. It is possible to supply lubricating oil from 25 and form an oil film on the surfaces of the smooth sliding surfaces 26 and 203 in a good condition. This reduces the sliding load between the surface of the resin-made thrust washer 20 in which the oil groove 25 exists and the smooth sliding surface 26, 203 of the thrust washer in which the oil groove 25 is not formed. Is possible.

Further, in the present embodiment, the side of the resin-made thrust washer 20 arranged on one end side and the other end side of the array of thrust washers opposite to the surface facing the thrust washer arranged at the center of the array. The surface is provided with smooth sliding surfaces 26 and 203 in a state where the oil groove 25 is not formed.

Therefore, the oil groove 25 does not exist between the mating members C1 and C2 and the resin-made thrust washers 20 arranged on one end side and the other end side of the arrangement of the thrust washers. Therefore, if the surfaces of the mating members C1 and C2 facing the resin-made thrust washers 20 arranged on the one end side and the other end side of the array of thrust washers are rough, the one end side and the other end side are rough. The resin-made thrust washer 20 does not slide on the mating members C1 and C2 but is in a state of rotating together. Therefore, between the one surface side of the resin-made thrust washer 20 on which the oil groove 25 is present and the smooth sliding surface 26, 203 of the thrust washer arranged in the center, Lubricating oil is supplied from the oil groove 25. As a result, it is possible to form an oil film on the surface of the smooth sliding surface 26 satisfactorily. Therefore, it becomes possible to reduce the sliding load between these surfaces.

Further, in the present embodiment, the thrust washer arranged in the center of the array of the three thrust washers is the metal thrust washer 50 made of metal. Therefore, it is possible to reduce the overall thickness of the combined thrust washer 10. In addition, lubricating oil is supplied from the oil groove 25 between the sliding surface 203 of the metal thrust washer 50 and the surface side of the resin thrust washer 20 on the end side and the other end side where the oil groove 25 exists. To be done. As a result, it is possible to form an oil film on the surface of the smooth sliding surface 26 satisfactorily. Therefore, it becomes possible to reduce the sliding load between these surfaces.

Further, in the present embodiment, the surrounding portion 111 surrounded by the first oil groove 25a, the second oil groove 25b and the opening 27 is recessed in the thickness direction with respect to the sliding surface 26. Further, between the enclosing portion 111 and the first oil groove 25a, and between the enclosing portion 111 and the second oil groove 25b, there is provided an oil bank portion 109 that separates these, and the position of the oil bank portion 109 in the thickness direction. Is provided at the same position as the sliding surface 26.

Therefore, the surrounding portion 111 is recessed from the oil bank portion 109. For this reason, the oil bank portion 109 may directly slide with respect to other members (counterpart materials C1, C2 and other thrust washers), but the enclosing part 111 includes other members (counterpart materials C1, C2 and other thrust washers). Do not slide directly against other thrust washers. On the other hand, the lubricating oil flows into the surrounding portion 111 through the oil groove 25, and the lubricating oil is stored in the surrounding portion 111. Therefore, it becomes possible to further reduce the sliding load between the resin thrust washer 20 and the other members (the mating members C1, C2 and other thrust washers).

[6. Modification]
Although the respective embodiments of the present invention have been described above, the present invention can be variously modified other than this. This will be described below.

In the above-mentioned embodiment, the oil groove 25 having the same shape is provided on the front surface and the back surface of one resin thrust washer 20. However, the oil grooves 25 formed on the front surface and the back surface of one resin thrust washer 20 may have different shapes. Further, at least one of the oil grooves 25 formed in the resin-made thrust washer 20 constituting the combined thrust washer 10 may have a shape different from the other shapes. For example, depending on the surface roughness of the surface of the resin-made thrust washer 20, the metal-made thrust washer 50, the mating members C1 and C2, which faces the sliding surface 26 where the oil groove 25 is present, an appropriate amount of lubricating oil can be provided. The shape of the oil groove 25 may be changed so that the oil groove 25 is supplied.

Further, in the resin-made thrust washers 20 according to the above-described first to fifth configuration examples, the seventh configuration example, and the eighth configuration example, similarly to the communication oil groove 113 of the resin-made thrust washer 20 according to the sixth configuration example. Alternatively, a configuration may be adopted in which the communication oil groove 113 recessed from the sliding surface 26 is provided. FIG. 28 shows an example of such a configuration. In FIG. 28, the communication oil grooves 113 are provided in the same number as the set of the first oil grooves 25a and the second oil grooves 25b that draw a V shape. However, the number of the communication oil grooves 113 may be larger or smaller than the set of the first oil groove 25a and the second oil groove 25b that draws a V shape. Note that in the configuration shown in FIG. 28, the communication oil groove 113 is linearly provided along the radial direction. However, the communication oil groove 113 may be provided so as to be inclined with respect to the radial direction, not along the radial direction. Further, the communication oil groove 113 may be provided in a curved shape instead of a straight shape.

When such a communication oil groove 113 is provided, the flow rate of the lubricating oil passing through the communication oil groove 113 toward the outer diameter side can be increased. Therefore, it becomes possible to improve the heat dissipation of the resin thrust washer 20.

DESCRIPTION OF SYMBOLS 10... Combination thrust washer, 20... Resin thrust washer, 21... Ring-shaped part, 22... Insertion hole, 23... Oil introduction groove, 24... Oil scooping surface, 25... Oil groove, 25a... 1st oil groove, 25b... 2nd oil groove, 26... Sliding surface, 27... Opening part, 28, 110a... Oil stop wall, 50... Metal thrust washer, 109... Oil bank part, 110... Branch oil groove, 111... Enclosing part, 112... Sliding protrusion, 113... Communication oil groove, 114... Oil sump groove, 114a... First oil sump groove, 114b... Second oil sump groove, 115... Bottom part, 116... Dynamic pressure guide wall surface, 251,... Bottom part, 252... Curve Wall surface, 254... Dynamic pressure guide wall surface, 255... Tapered wall surface, 256... Convex curved surface portion, 257... Wide groove portion, 258... Narrow groove portion, 259, 260... Concave curved surface portion, 261... Inclined wall portion, 300... Load measuring device , 301... Oil pan, 301a... Inner cylinder part, 301b... Oil discharge port, 302... Fixed shaft, 303... Rotating shaft, 304... Oil supply passage, 305... Thermocouple, 306, 307... Oil seal, S1 to S3... Thrust washer

In order to solve the above problems, according to a first aspect of the present invention, there is provided a combination thrust washer including a plurality of thrust washers having a ring-shaped portion surrounding an insertion hole, wherein the thrust washer is made of at least one resin. A resin-made thrust washer made of a material containing the resin-made thrust washer is provided with a sliding surface on the front surface and the back surface of the ring-shaped portion that slides with another member, and at least one of the front surface and the back surface. Is provided with an oil groove that is recessed from the sliding surface and into which lubricating oil enters, and the oil groove has an opening that is recessed from the sliding surface at the inner peripheral end of the ring-shaped portion. Due to the presence of the oil, the lubricating oil enters from the insertion hole side, and an oil stop wall that separates the oil groove and the outside of the ring-shaped part is provided at the outer peripheral end of the ring-shaped part. position is provided at a position of about the same as the sliding surface of the lubricating oil having entered the oil groove is not prevented from flowing out to the outer peripheral side of the ring-shaped portion by the presence of Aburatomekabe, the oil groove Is a first oil groove inclined to one side with respect to the radial direction of the ring-shaped portion, and a second oil groove inclined to the other side different from one side with respect to the radial direction of the ring-shaped portion. Is provided, and the first oil groove and the second oil groove are connected by an opening, thereby providing a combined thrust washer.

Further, another aspect of the present invention is, in the above-mentioned invention, that the surrounding portion surrounded by the first oil groove, the second oil groove and the opening is recessed in the thickness direction with respect to the sliding surface, A first oil groove, and an oil bank portion that separates the first oil groove and the surrounding portion from the second oil groove are provided, and the position of the oil bank portion in the thickness direction is approximately the same as the sliding surface. are provided, it is preferable.

In order to solve the above problems, according to a second aspect of the present invention, there is provided a combination thrust washer including a plurality of thrust washers each having a ring-shaped portion surrounding an insertion hole, wherein the thrust washer has at least one sheet. A resin-made thrust washer made of a material containing a resin is provided.The resin-made thrust washer is provided with a sliding surface that slides with other members on the front and back surfaces of the ring-shaped portion, and further on the front and back surfaces. At least one side is provided with an oil groove that is recessed from the sliding surface and into which lubricating oil enters, and the oil groove extends in a direction inclined with respect to the radial direction of the ring-shaped portion, and the oil groove is slidable. There is an opening that is recessed from the surface at the inner peripheral end of the ring-shaped part, and the presence of the opening allows lubricating oil to enter from the insertion hole side, and at the outer peripheral end of the ring-shaped part, an oil groove and An oil stop wall separating from the outside of the ring-shaped portion is provided, the position in the thickness direction of the oil stop wall is provided at the same position as the sliding surface, and the presence of the oil stop wall causes the oil groove to be formed in the oil groove. The lubricating oil that entered is prevented from flowing out to the outer peripheral side of the ring-shaped part, and at least one of the front and back surfaces of the resin thrust washer is dented from the sliding surface and lubricated separately from the oil groove. A combination thrust washer is provided, which is provided with a communication oil groove into which oil enters, and the outer peripheral end of the ring-shaped portion is recessed without being separated from the communication oil groove and the outside of the ring-shaped portion. To be done.

In order to solve the above problems, according to a third aspect of the present invention, there is provided a combination thrust washer including a plurality of thrust washers each having a ring-shaped portion surrounding an insertion hole, wherein the thrust washer has at least one sheet. A resin-made thrust washer made of a material containing a resin is provided.The resin-made thrust washer is provided with a sliding surface that slides with other members on the front and back surfaces of the ring-shaped portion, and further on the front and back surfaces. At least one is provided with an oil groove that is recessed from the sliding surface and into which lubricating oil enters, and the oil groove has an opening that is recessed from the sliding surface at the inner peripheral end of the ring-shaped portion. The presence of the opening allows the lubricating oil to enter from the insertion hole side, and an oil stop wall that separates the oil groove from the outside of the ring-shaped part is provided at the outer peripheral end of the ring-shaped part. The position in the thickness direction is provided at the same position as the sliding surface, and the presence of the oil stop wall prevents the lubricating oil that has entered the oil groove from flowing out to the outer peripheral side of the ring-shaped portion. Three thrust washers are provided, and a smooth sliding surface with no oil groove formed on the front surface and the back surface of the ring-shaped portion of the thrust washer arranged in the center of the arrangement of the three thrust washers. A combined thrust washer is provided.

Further, according to another aspect of the present invention, in the above invention , it is preferable that the thrust washer is provided with at least one metal thrust washer made of a metal .
Another aspect of the present invention is, in the above-mentioned invention, that three thrust washers are provided, and a front surface and a back surface of a ring-shaped portion of the thrust washer arranged in the center of an array of the three thrust washers. Is preferably provided with a smooth sliding surface in which no oil groove is formed.

Further, according to another aspect of the present invention, in the above-mentioned invention, the thrust washers arranged on one end side and the other end side of the array are resin-made thrust washers and are arranged on one end side and the other end side of the array. It is preferable that an oil groove is provided on the surface of the resin-made thrust washer facing the thrust washer arranged at the center of the array .

Further, another aspect of the present invention is, in the above-mentioned invention, a surface facing the thrust washer arranged in the center of the array among the resin-made thrust washers arranged on one end side and the other end side of the array. It is preferable that a smooth sliding surface in which no oil groove is formed is provided on the opposite surface .

Further, in another aspect of the present invention, in the above-mentioned invention, it is preferable that the thrust washer arranged at the center of the arrangement of the three thrust washers is a metal-made thrust washer made of a metal material. ..
Another aspect of the present invention is, in the above-mentioned invention, an oil scooping surface for guiding lubricating oil to the opening is provided on the inner peripheral side of the ring-shaped portion, and the oil scooping surface is a sliding surface. It is preferable that it is inclined with respect to.

Claims (8)

A combined thrust washer comprising a plurality of thrust washers each having a ring-shaped portion surrounding an insertion hole,
The thrust washer is provided with a resin-made thrust washer made of a material containing at least one resin,
The resin-made thrust washer is provided with sliding surfaces on the front surface and the back surface of the ring-shaped portion that slide with other members, and further, at least one of the front surface and the back surface is recessed from the sliding surface and a lubricating oil is provided. There is an oil groove that allows
In the oil groove, an opening recessed from the sliding surface is present at the inner peripheral end of the ring-shaped portion, and the presence of the opening allows the lubricating oil to enter from the insertion hole side,
An oil stop wall that separates the oil groove and the outside of the ring-shaped portion is provided at the outer peripheral end of the ring-shaped portion, and the position in the thickness direction of the oil stop wall is approximately the same as the sliding surface. At the position
The presence of the oil stop wall prevents the lubricating oil that has entered the oil groove from flowing out to the outer peripheral side of the ring-shaped portion,
A combination thrust washer characterized by the following. A combination thrust washer according to claim 1, wherein
The oil groove includes a first oil groove that is inclined to one side with respect to the radial direction of the ring-shaped portion, and a first oil groove that is inclined to the other side different from the one side with respect to the radial direction of the ring-shaped portion. And a second oil groove that opens,
The first oil groove and the second oil groove are connected by the opening,
A combination thrust washer characterized by the following. A combination thrust washer according to claim 1 or 2, wherein
The thrust washer is provided with at least one metal thrust washer made of metal,
A combination thrust washer characterized by the following. The combined thrust washer according to any one of claims 1 to 3,
There are three thrust washers,
On the front surface and the back surface of the ring-shaped portion of the thrust washer arranged at the center of the arrangement of the three thrust washers, smooth sliding surfaces in a state where the oil groove is not formed are provided.
A combination thrust washer characterized by the following. A combination thrust washer according to claim 4, wherein
The thrust washers arranged on one end side and the other end side of the array are the resin-made thrust washers,
Of the resin-made thrust washers arranged on one end side and the other end side of the array, the oil groove is provided on a surface facing the thrust washer arranged at the center of the array,
A combination thrust washer characterized by the following. A combination thrust washer according to claim 5, wherein
Of the resin-made thrust washers arranged on one end side and the other end side of the array, the oil groove is formed on the surface opposite to the surface facing the thrust washer arranged in the center of the array. Provided with a smooth sliding surface that is not formed,
A combination thrust washer characterized by the following. A combined thrust washer according to any one of claims 4 to 6,
The thrust washer arranged at the center of the arrangement of the three thrust washers is a metal thrust washer made of metal.
A combination thrust washer characterized by the following. The combined thrust washer according to any one of claims 2 to 7,
The surrounding portion surrounded by the first oil groove, the second oil groove and the opening is recessed in the thickness direction from the sliding surface,
An oil bank portion is provided between the surrounding portion and the first oil groove, and between the surrounding portion and the second oil groove, and an oil bank portion for separating these is provided. It is provided at the same position as the moving surface,
A combination thrust washer characterized by the following.

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