JP3011834B2 - One-way clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch, and more particularly, to a one-way clutch which is suitable for use in, for example, an automatic transmission and has improved rigidity, reduced cost and reduced size.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a general one-way clutch. The one-way clutch includes an inner race 31 and an outer race 32.
A sprag 33 disposed between the inner race 31 and the outer race 32, an outer cage 35 and an inner cage 36 for holding the sprag 33, and a ribbon spring 37 for urging the sprag 33 in one direction. And end bearings 38 and 39 that are arranged on both sides of the sprag 33, the retainers 35 and 36, and the ribbon spring 37, and that maintain a space between the inner ring 31 and the outer ring 32.

In the one-way clutch, the inner ring 31 is
2, the force is transmitted from the inner race 31 to the outer race 32 only when rotating in one direction.

Conventionally, the following four types of one-way clutch end bearings 38 and 39 have been roughly classified.

[0005] That is, the first structure is, as shown in FIG. 2A, formed by pressing a phosphor bronze plate 41.

The second structure is, as shown in FIG. 2B, formed by pressing a bimetal material 45 in which a bearing plate (phosphor bronze plate) 43 is fixed to a steel plate 42.

The third structure is, as shown in FIG. 2C, manufactured by turning a high-strength brass 46 which is a copper alloy.

Although not shown in the drawing, a fourth configuration is known in which steel is cut, quenched and tempered, polished, and then its surface is subjected to a manganese phosphate coating treatment or the like. Have been.

[0009]

However, the end bearings 38, 39 of the first to fourth constructions of the conventional one-way clutch described above have a high material cost and a high processing cost, and the cost of the one-way clutch is high. .

More specifically, the end bearings 38, 3
2A, in the case of the first configuration made of the phosphor bronze plate 41 as shown in FIG. 2A, the Young's modulus and the hardness of the end bearing are sufficient to achieve the required radial load resistance. Value cannot be achieved, resulting in insufficient rigidity of the end bearing. Therefore, there is a disadvantage that the function of the one-way clutch is reduced or the one-way clutch is damaged in some cases.

Further, the bimetal material 45 of the second configuration is used.
Each of the plates 4 is fixed so that the plates 42, 43 are not distorted when the bearing plate (phosphor bronze plate) 43 is fixed (sintered) to the steel plate 42.
Since it is necessary to increase the thickness of 2,43, there is a problem that the thickness is increased and it is difficult to reduce the size. Further, since the steel plate 42 of the bimetallic material is annealed when the bearing plate 43 is sintered on the steel plate 42 and the hardness is reduced,
There was a disadvantage that the strength of the end bearing was reduced and the end bearing was plastically deformed.

FIG. 2C shows the end bearing.
As shown in FIG. 3, a third alloy made of copper alloy, high-strength brass 46
In the case of the configuration, turning of the copper alloy is required, so that the thickness of the end bearing cannot be reduced, and the thickness becomes thicker than in the case where the end bearing is made of a bimetal material, and it becomes more difficult to reduce the size. There is a problem. Further, there is a problem that high-strength brass is expensive.

Further, in the end bearing of the fourth configuration, although necessary rigidity can be secured, sufficient seizure resistance is secured because the manganese phosphate salt film formed on the surface has poor conformability and self-lubricating property. For this purpose, high dimensional accuracy is required at the time of manufacture, and as a result, the cost of the one-way clutch as a whole increases.

An object of the present invention is to provide a one-way clutch in which end bearings have high rigidity, are inexpensive, and can be easily made compact.

[0015]

In order to achieve the above object, a one-way clutch according to the first aspect of the present invention includes an inner wheel, an outer wheel, a sprag disposed between the inner wheel and the outer wheel, A retainer for holding the sprag, a spring for urging the sprag in one direction, and end bearings arranged on both sides of the sprag, the retainer and the spring for retaining a space between the inner ring and the outer ring. In the one-way clutch, the end bearing is
It is characterized by being made of a steel sheet having a lubricating Pb-Sn-based plating coating.

A one-way clutch according to a second aspect of the present invention is the one-way clutch according to the first aspect, wherein Sn plating is applied to the entire surface of the end bearing.

According to a third aspect of the present invention, there is provided a one-way clutch, comprising: an annular inner ring provided radially inward, an annular outer ring surrounding the inner ring, and the inner ring and the outer ring. A plurality of sprags slidably interposed therebetween, a retainer for holding the sprag, a ribbon spring for pressing the sprag against the raceway surfaces of the two wheels, and an axially outer side than the retainer. A one-way clutch comprising an annular end bearing slidably interposed between the peripheral surfaces of the two wheels and supporting a radial load acting on the two wheels, wherein the end bearing has an inner peripheral cylindrical shape. A main body made of an iron-based material composed of a portion, an outer cylindrical portion, and an end face portion connecting these, and a soft Pb-Sn-based plating coating formed on the surface of the main body. Toshii You.

A one-way clutch according to a fourth aspect of the present invention is the one-way clutch according to the third aspect, wherein Sn plating is applied to the entire surface of the end bearing.

[0019]

According to the first aspect of the present invention, since the end bearing is made of a steel plate having a lubricating Pb-Sn-based plating coating, the end bearing has a high rigidity, is easy to process, and is inexpensive. Characteristics and Pb-S
The abrasion resistance of the n-type coating has excellent lubricating properties. Therefore, according to the invention of claim 1,
An inexpensive one-way clutch with high end bearing rigidity, excellent wear resistance, and easy compactness is provided. In addition, since "plating", which can be processed at a low temperature, is adopted as a coating method, there is no fear of adversely affecting a member to be coated.

More specifically, since the steel plate is inexpensive compared to phosphor bronze, bimetallic materials, and copper alloy materials, and has higher strength than phosphor bronze, the end bearing has a sufficient radial load resistance. In addition to achieving this, an inexpensive one-way clutch can be realized. Moreover, since the steel sheet can be easily formed by press working, unlike the conventional example, an increase in thickness due to the working method can be avoided, and compactness can be achieved.

According to the second aspect of the present invention, since the Sn bearing is applied to the entire surface of the end bearing, the appearance of the end bearing can be improved.

According to the third aspect of the invention, since the main body is made of an iron-based material, sufficient rigidity to withstand a radial load acting on the end bearing can be secured. In addition, since the coating of the end bearing is a soft Pb-Sn-based plating coating, it has good conformability when slidingly contacting the inner ring and the outer ring.
-It is possible to realize an end bearing having excellent seizure resistance and durability, which has lubrication characteristics having excellent wear resistance by a Sn-based coating. In addition, since "plating" is adopted as the coating method, the coating can be performed at a low temperature, and there is no fear of adversely affecting the member to be coated.

Therefore, it is possible to provide a one-way clutch which is superior in seizure resistance and durability as compared with the prior art.

According to the fourth aspect of the present invention, since the Sn plating is applied to the entire surface of the end bearing, the appearance of the end bearing can be improved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows an end bearing 50 of a one-way clutch according to a first embodiment of the present invention. The basic structure of this embodiment is shown in FIG.
Therefore, the description thereof will be omitted, and the configuration of the end bearing different from the conventional example will be mainly described.

As shown in FIG. 1, the end bearing 50 of the one-way clutch of this embodiment is formed of a steel plate cold commercial (SPCC), a steel plate cold deep drone extra (SPCE) or the like. It is made of a metal material obtained by applying a lead-based coating 52 to a cold-rolled steel plate 51. The thickness of the coating 52 is about 5 to 30 μm.

The lead bearing 52 achieves the seizure resistance and the wear resistance required for the end bearing 50 and the excellent initial adaptation by the lead-based coating 52. In addition, the coating 52
Since the processing temperature when forming the steel sheet is lower than the sintering temperature of the conventional bimetal material, the steel sheet 5 is not coated during coating.
The hardness of No. 1 does not decrease.

The steel plate 51 is inexpensive compared to phosphor bronze, a bimetal material, or a copper alloy material, has a higher Young's modulus than phosphor bronze, and has a higher hardness. As a result, it is possible to achieve an inexpensive one-way clutch while improving rigidity as compared with the conventional example.

Further, since the steel plate 51 can be easily formed by press working, unlike the conventional example, the increase in thickness due to the working method can be avoided, and the size can be reduced. Specifically, the thickness of the metal material is set to 0.9
mm or 0.76 mm or less.

Second Embodiment Next, a second embodiment will be described. FIG. 4 shows a cross section of a main part of an automatic transmission for a vehicle.

The one-way clutch 1 includes an inner race 2 having an annular raceway surface 2a, an outer race 3 having an annular raceway surface 3a,
A plurality of sprags 4 arranged between the two wheels 2 and 3 for transmitting torque by engaging with both raceway surfaces 2a and 3a;
And a retainer 7 comprising a pair of inner and outer annular members 5 and 6 for holding the gears at equal intervals in the circumferential direction, and disposed between the annular members 5, 6 so that the sprags 4 engage with the two raceway surfaces 2a, 3a. A ribbon spring 8 that gives a moment in the direction of engagement,
An end bearing 11 comprising a pair of annular members 9 and 10 according to the present invention disposed at positions adjacent to both ends in the axial direction of the retainer 7.

The inner ring 2 rotates in conjunction with a rotating shaft (not shown), and the outer ring 3 is engaged with a conventionally known friction plate 12 through a plurality of axial grooves 3b.

Each sprag 4 has the dimension of R1 shown in FIG. 5 set to be larger than R0, and a ribbon spring 8 is elastically mounted over each recess 4a of each adjacent sprag 4, and the sprags shown in FIG. 4 is given a counterclockwise moment. As a result, each sprag 4 is
, Cannot rotate in the counterclockwise direction, but can rotate slightly in the clockwise direction. Therefore, when the inner ring 2 tries to rotate counterclockwise with respect to the outer ring 3, the inner ring 2 slides with respect to each sprag 4 and can freely rotate in the counterclockwise direction. Is not transmitted. Conversely, when the inner ring 2 is to rotate clockwise with respect to the outer ring 3, the inner ring 2 is engaged with or meshes with each sprag 4, and each sprag 4 is simultaneously engaged with or meshed with the outer ring 3. As a result, torque is transmitted from the inner race 2 to the outer race 3, and the one-way clutch 1 integrally rotates clockwise.

The annular members 9 and 10 constituting the end bearing 11 have end face portions 9a and 10a and inner circumferential cylindrical portions 9b and 10 formed by extending their inner and outer peripheral edges in the axial direction.
b and the outer cylindrical portions 9c, 10c, so that the cross sections of the annular members 9, 10 are U-shaped. The left end of the retainer 7 in the axial direction is positioned between the inner peripheral cylindrical portion 9b and the outer peripheral cylindrical portion 9c of the left annular member 9, and the right annular member is formed. The end of the retainer 7 on the right side in the axial direction is positioned between the inner cylindrical portion 10b and the outer cylindrical portion 10c.

In this state, the two annular members 9,
At the same time, the inner peripheral surfaces of the inner cylindrical portions 9b, 10b are brought into sliding contact with the outer peripheral surface of the inner race 2, and at the same time, the outer peripheral surfaces of the outer cylindrical portions 9c, 10c of the annular members 9, 10 are rotated. The surface is in sliding contact with the inner peripheral surface of the outer ring 3.

Therefore, the end bearings 11 arranged as described above can make the axes of the two wheels 4, 5 coincide with each other, and also support the both wheels 4, 5 in the radial direction.

In this embodiment, as shown in an enlarged view in FIG. 6, the end bearing 11 is constructed as follows to improve the bearing performance.

That is, each of the annular members 9 and 10 constituting the end bearing 11 is made up of an annular main body 9A, 10A having a U-shaped cross section, and a soft coating 9B, formed on the surface of the main body 9A, 10A. 10B.

The main bodies 9A and 10A are manufactured by press-forming an iron-based material (for example, an iron plate) into a U-shaped cross section, and the end faces 9a and 10a of the main bodies 9A and 10A manufactured in this manner. Pb-Sn-based plating is applied to the outer surface and the sliding portions of the inner and outer cylindrical portions 9b, 10b, 9c, 10c which are continuous with the outer rings and the two wheels 4, 5 to form coatings 9B, 10B. are doing.

In this embodiment, the coating 9B, 1
10% by weight Sn, 2% by weight
And the plating bath temperature was 25 ° C. to 30 ° C.

The thickness of the coatings 9B and 10B in this embodiment is set to be about 15 μm to 25 μm.

Instead of manufacturing the main body portions 9A and 10A by press molding, an iron-based material may be manufactured to have the above-mentioned shape by cutting or the like. However, considering that the time and cost required for manufacturing are low, it is preferable to manufacture the main bodies 9A and 10A by press molding.

Example 3 In Example 3, as a material of the coatings 9B and 10B, 7.5% by weight of Sn and 5.5% by weight of Sn were used.
Using the plating material consisting of In and the balance Pb,
The main body portions 9A and 10A having the same configuration as the embodiment are plated.

In this case, the temperature of the plating bath is set at 25 ° C. to 30 ° C. in the same manner as in the first embodiment.
Diffusion was performed over time. In addition, coating 9B,
The thickness of 10B is also 15 μm to 25
It is about μm.

(Embodiment 4) In Embodiments 2 and 3, coatings 9B and 10
Although a Pb-Sn-based plating material is used as B, in Example 4, PT B was used instead of the Pb-Sn-based plating material.
The main body parts 9A and 10A are coated with FE resin.

The PTFE resin is coated on the main bodies 9A and 10A, dried at about 100 ° C., and then heat-treated at about 280 ° C. The thickness of the coatings 9B and 10B is 2
It is set to about 0 μm to 35 μm.

(Embodiment 5) FIG. 7 shows a fifth embodiment.
As in the first embodiment, the entire surface of the main body portions 109A and 110A manufactured by press-forming an iron-based material (for example, an iron plate) is covered with a manganese phosphate salt film 116 as a base treatment.

Next, the manganese phosphate salt coating 11
The outer surfaces of the end surfaces 109a, 110a of the main body portions 109A, 110A covered with 6 and the peripheral surfaces of the inner and outer cylindrical portions 109b, 109c, 110b, 110c continuous therefrom are further coated with Molycoat 106 (Dow Corning Co. (Trademark).

As described above, in the fifth embodiment, the coatings 109B and 110B are constituted by the manganese phosphate salt film 116 and the molycoat 106, and the thickness of the manganese phosphate salt film 116 is set to 20 μm to 35 μm. Coating 1 including manganese salt film 116
The thickness of 09B and 110B is about 25 μm to 45 μm. In the fifth embodiment, members corresponding to those in the second embodiment are given member numbers obtained by adding 100 in principle.

(Embodiment 6) FIG. 8 shows a sixth embodiment. In the end bearing 211 of the sixth embodiment, the end bearing 211 of the second embodiment shown in FIG. This is the one subjected to Sn plating 217. This Sn plating 217
Has a thickness of about 1.5 μm. In this way, by applying the Sn plating 217 to the entire surface of the end bearing 211, the appearance of the end bearing 211 can be made better than that of the second embodiment shown in FIG. In the sixth embodiment, members corresponding to those of the second embodiment are given member numbers obtained by adding 200 in principle.

Further, as in the case of the sixth embodiment, Sn plating may be applied to the entire surface of the end bearing of the third embodiment.

The results of the seizure resistance test and the durability test of each of the examples of the end bearings 11 (111) according to Examples 2 to 5 and the conventionally known end bearings and other comparative products are shown. What is Figure 10
11 to FIG.

The test conditions are as follows.

Tester: Rotary load bush journal tester Test conditions: As shown in FIG. 9, each pair of annular members 9, 1
Two end bearings 11, 11 'constituted by 0, 9', 10 'are arranged in the axial direction, and the outer cylindrical portions of the end bearings 11, 11' are fixed, while the inner cylindrical portion is fixed. The test was carried out by sliding on the rotating shaft 20.

Incidentally, 2 liters of lubricating oil at an oil temperature of 100 ° C. was supplied to the sliding contact portions 20 a, 20 b, 20 c, 20 d between the end bearings 11, 11 ′ and the rotating shaft 20. When the rotating shaft 20 is rotated at 4000 rpm, a rotating load of about 3 kgf is applied to each end bearing 11, 11 '. When the rotating shaft 20 is rotated at 6000 rpm, about 6 kgf is applied to each end bearing 11, 11'. A rotating load of 0.5 kgf was applied.

The conventional product shown at the top of FIG. 10 is one in which phosphor bronze plate powder is uniformly spread on an iron plate, sintered at about 860 ° C., and then pressed to form an end bearing. In this conventional product, the rotating shaft 20 is
No seizure was observed in the anti-seizure test in which the rotating shaft 20 was continuously rotated at 6000 rpm for 20 hours (No. 2). Previous seizure occurred.

In this conventional product, the rotating shaft 20 is set at 40
The average wear amount of each of the sliding portions 20a to 20d of the rotating shaft 20 after the durability test in which the rotating shaft 20 is continuously rotated at 200 rpm for 200 hours, and the end bearings 1 which are in sliding contact with them
The average variation of the inner diameter of the annular members 9, 10, 13 ', 14' of 1, 11 'is as shown in FIG. That is, 2
After the lapse of 00 hours, the inner diameters of the end bearings 11 and 11 ′ are worn by about 38 μm,
Was worn by about 10 μm.

In the second and third embodiments of the present invention in which the thickness of the coating is 10 μm and 30 μm, respectively, as shown in FIG.
The results of (Part 1) are all end bearings 11, 11 '
The contact of the sliding contact portion with the rotating shaft 20 was good and no seizure was observed. The seizure resistance test (Part 2)
In both Examples 2 and 3, the coating thickness is 30 μm.
Was performed only for the test, and as a result, no image sticking was observed until 20 hours had elapsed.

Further, as shown in FIG. 11, the results of a durability test in which the rotating shaft 20 was continuously rotated at 4000 rpm for 200 hours according to Example 2 with the coating thickness being 30 μm are shown. Contact portions 20a, 20b, 20
The average wear in c, 20d is about 1 μm or less,
Compared with the above conventional product, the amount of wear of the rotating shaft 20 is extremely small. The average change in the inner diameter of each of the annular members on the end bearing side in sliding contact with the rotating shaft 20 was about 11 μm or less even after 200 hours, and was about one third of the conventional product. .

From the above test results, it can be understood that the coating of Example 2 having a thickness of 30 μm has a better contact with the sliding contact with the rotating shaft 20 than the conventional product.

In Example 3, the thickness of the coating was 3
The result of the durability test for the sample having a thickness of 0 μm is the same as that in the case of the second embodiment.

Returning to FIG. 10, in Examples 4 and 5, as a result of the seizure resistance test (No. 1), no seizure was observed and the sliding contact portion of the end bearing was not observed. The hit was good.

In Examples 4 and 5, as a result of the seizure resistance test (No. 2), no seizure was observed until 20 hours had elapsed.

Further, as shown in FIG. 11, the results of the endurance test for the fourth and fifth embodiments show that the average wear amount of the sliding portions 20a to 20d on the rotating shaft 20 side is 2 μm or less, and The average variation of the inner diameter on the bearing side is also 16 μm or less, indicating much better bearing performance than the above-mentioned conventional product.

The comparative products 1 to 6 shown in FIG.
The figure shows a main body formed in the same manner as the present invention, which has been subjected to a surface treatment different from that of the present invention.

Comparative products 1 and 2 each had the same main body as that of the present embodiment and were subjected to hard surface treatment. Comparative product 1 was Ni-P plated, and Comparative product 2 was Nyflow plated. Things.

Comparative products 3 to 5 were the same as those of the present embodiment in which the surface of the main body was coated with tuftride. Comparative product 3 was the one in which the surface of the main body was coated only with tuftride. After the surface of the main body is coated with tuftride, a manganese phosphate film is further coated.

Next, the comparative product 6 is obtained by coating the surface of the main body formed in the same manner as in the present application with a manganese phosphate film.

As can be understood from the results of the seizure resistance test shown in FIG. 10, in Comparative Products 1-6, when the seizure resistance test (No. 1) was performed, before 20 hours passed. It can be understood that seizure occurred in all cases and the bearing performance was clearly inferior to this example. In these comparative products 1-6, seizure had already occurred in the seizure resistance test (part 1), so the seizure resistance test (part 2) was not performed.

As can be understood from the results of the above-mentioned seizure resistance test (Nos. 1 and 2) and the durability test, Examples 2 to 5 of the present invention show the conventional products and the comparative products 1 to 6
As compared with the above, the contact of the sliding contact portion is good, the seizure resistance is excellent, and the durability is also excellent. The plating film shows excellent seizure resistance even when Sn-based plating is applied to the main body made of the iron-based material of this embodiment in addition to the Pb-Sn-based component. Further, the end bearing 2 of the sixth embodiment is used.
Numeral 11 is obtained by applying Sn plating to the entire surface in order to improve the appearance. Therefore, the bearing performance is substantially the same as that of the second embodiment, so that the experiment was omitted.

As described above, the end bearing 11 (111) of this embodiment is made of an iron-based material,
By configuring 10A, it is possible to secure sufficient rigidity to withstand a load in the radial direction. Moreover, according to the present invention, the surfaces of the main bodies 9A and 10A (109A and 110A)
So-called soft coatings 9B, 10B (109B, 1
Since 10B) is formed, it has excellent seizure resistance as described above, and has good conformability when slidingly contacting the rotating shaft.

Further, the soft coatings 9B and 10B (109B and 110B) as described in the above embodiment not only have good conformability as described above, but also have a smooth sliding surface even in a high load range without roughening. A contact surface is obtained, and a state in which the friction resistance is small and seizure is difficult is obtained. In the oil lubrication region as in the seizure resistance test, the soft coating 9
Good affinity between B, 10B (109B, 110B) and oil,
Furthermore, coatings such as Pb-Sn-based plating that are rich in stretchability and extensibility (in the case of Example 1, Example 2, and Example 3) have particularly excellent performance. Further, even in the case of a PTFE-based resin (Example 4) having a poor affinity for oil, the wear resistance of the coating can be obtained by increasing the strength of the coating in combination with an organic binder.

Then, as described above, the coating 9B,
Since 10B (109B, 110B) has good conformability, deformation of the end bearings 11 (111) is effectively suppressed, and it is possible to reduce the contact of the sprags 4 due to the eccentricity of the inner and outer rings 2, 3. . Therefore, not only the end bearings 11 (111), but also the wear of the sprags 4 and the raceway surfaces 2a, 3a of the inner and outer rings 2, 3 can be reduced.
Overall wear reduction as a one-way clutch can be achieved.

Further, as described above, in the present embodiment, the processing temperature of the plating process for forming the coatings 9B and 10B (109B and 110B) is set to be lower than the conventional general processing temperature (tufftriding at about 560 ° C.). At most 2
Since the temperature is set to about 80 ° C., it is possible to prevent the main body portions 9A and 10A from being distorted by the heat of the plating process. For this reason, the manufactured end bearing 11 can ensure a more accurate finished dimension as compared with the related art. When the temperature of the plating process of the coatings 9B and 10B (109B and 110B) exceeds 650 ° C. to 700 ° C., the iron-type material constituting the main bodies 9A and 10A (109A and 110A) is annealed to reduce rigidity. Considering the strain due to the heat treatment after press molding, the heat treatment temperature of the coatings 9B and 10B (109B and 110B) is 300
C. or lower, preferably 200 ° C. or lower.

[0076]

As is apparent from the above description, in the one-way clutch of the first aspect of the present invention, the end bearing is made of a steel plate having a lubricating Pb-Sn-based plating coating. Bearings are characterized by the high rigidity, easy processing and low cost of steel plate, and Pb-
The wear resistance of the Sn-based coating is combined with excellent lubricity. Therefore, according to the first aspect of the present invention, it is possible to provide an inexpensive one-way clutch that has high rigidity of the end bearing, has excellent wear resistance, and is easy to make compact. In addition, since "plating", which can be processed at a low temperature, is adopted as a coating method, there is no fear of adversely affecting a member to be coated.

More specifically, the steel plate is inexpensive compared to phosphor bronze, bimetallic materials and copper alloy materials, and has higher strength than phosphor bronze, so that a sufficient radial load resistance of the end bearing is achieved. And an inexpensive one-way clutch can be realized. Moreover, since the steel sheet can be easily formed by press working, unlike the conventional example, an increase in thickness due to the working method can be avoided, and compactness can be achieved.

According to the second aspect of the present invention, since the entire surface of the end bearing is plated with Sn, the appearance of the end bearing can be improved.

Further, the end bearing of the one-way clutch according to the third aspect of the present invention employs an iron-based material for the main body, so that the end bearing has sufficient rigidity to stop the radial load acting on the end bearing. Can be secured.
The end bearing coating is made of soft Pb-
Since Sn plating is used, it has good conformability when sliding against the inner and outer rings, and also has an excellent seizure resistance and durability with Pb-Sn coating which has excellent lubrication characteristics. it can. In addition, since "plating" is adopted as the coating method, the coating can be performed at a low temperature, and there is no fear of adversely affecting the member to be coated.

Therefore, it is possible to provide a one-way clutch which is superior in seizure resistance and durability as compared with the conventional one.

According to the fourth aspect of the present invention, since the entire surface of the end bearing is plated with Sn, the appearance of the end bearing can be improved.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an end bearing according to a first embodiment of a one-way clutch of the present invention.

FIG. 2 is a half sectional view of an end bearing of a conventional one-way clutch.

FIG. 3 is a half sectional view showing the structure of a one-way clutch.

FIG. 4 shows a one-way clutch 1 showing a second embodiment of the present invention.
FIG. 4 is a cross-sectional view above the center line of FIG.

FIG. 5 is a cross-sectional view taken along the line II-II of FIG.

FIG. 6 is an enlarged sectional view of a main part of FIG.

FIG. 7 is an enlarged sectional view showing a third embodiment of the present invention.

FIG. 8 is an enlarged sectional view showing a fourth embodiment.

FIG. 9 is a sectional view of a main part showing test conditions of a seizure resistance test.

FIG. 10 is a view showing the results of a seizure resistance test.

FIG. 11 is a diagram showing the results of durability tests on a conventional product and the present invention.

[Explanation of symbols]

Reference numeral 50: end bearing, 51: cold-rolled steel plate, 52: lead-based coating, 1 ... one-way clutch, 2 ... inner ring, 3 ... outer ring, 4 ... sprag, 7 ... retainer, 8 ... ribbon spring, 11 (111) , 211) ... end bearing, 9A, 10A (109A, 110A, 209A, 210A) ...
Body, 9B, 10B (109B, 110B, 209B, 210B) ...
coating.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Jun Sonoda 3-65, Midorigaoka, Toyota-shi, Aichi Prefecture Inside Daitoyo Kogyo Co., Ltd. (72) Inventor Mikio Takewaka 3-65, Midorigaoka, Toyota-shi, Aichi Pref. (56) References JP-A-3-140672 (JP, A) JP-A 62-134937 (JP, U) JP-A 59-19140 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 41/07

Claims (4)

(57) [Claims] An inner ring, an outer ring, a sprag disposed between the inner ring and the outer ring, a retainer for holding the sprag, a spring for urging the sprag in one direction,
A one-way clutch having end bearings disposed on both sides of the sprag, the retainer and the spring, and for maintaining a space between the inner ring and the outer ring, wherein the end bearing is a Pb-Sn-based plating having lubricity; A one-way clutch, which is made of a steel plate having a coating. 2. The one-way clutch according to claim 1, wherein Sn plating is applied to the entire surface of the end bearing. 3. An annular inner ring provided on a radially inner side,
An annular outer ring surrounding the inner ring, a plurality of sprags slidably interposed between the inner ring and the outer ring, a retainer for holding the sprag, and a raceway surface of the two rings for the sprag. An annular end slidably interposed between the ribbon spring for pressing against the outer ring and the circumferential surface of the two wheels axially outward from the retainer and supporting a radial load acting on the two wheels. A one-way clutch including a bearing, wherein the end bearing includes a main body made of an iron-based material including an inner peripheral cylindrical part, an outer peripheral cylindrical part, and an end face connecting these parts, and a surface of the main part. Soft Pb-Sn formed in
A one-way clutch characterized by comprising a system plating coating. 4. The one-way clutch according to claim 3, wherein Sn plating is applied to the entire surface of the end bearing.