JPH0678627U - Roller with cage - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a roller with a cage that is inexpensive, has high wear resistance, and suppresses heat generation due to high-speed rotation. [Structure] The composite plating film 11 in which fine particles of a fluororesin are uniformly dispersed and co-deposited is formed at a required portion to obtain the above effect.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a roller with cage, and more particularly to a roller with cage suitable for high speed rotation.

[0002]

[Prior art]

Conventionally, rollers with cages have been widely used for connecting rods of engines mounted on motorcycles and the like, taking advantage of the features of small sectional height and large load capacity.

[0003]

[Problems to be solved by the device]

 Recently, there is a tendency to increase the speed of engine rotation, and in the case of the conventional cage with a retainer, copper plating or silver plating is applied to prevent the abrasion and burning. The roller with cage that has been subjected to silver plating has achieved better high-speed rotation performance than the roller that has been plated with copper, but the maximum rotation speed that can withstand it is still 13,000 rpm. However, even if the supply of lubricating oil is considerably increased, there is a drawback that abrasion and burning will occur if the rotational speed is further increased. Moreover, the plating process using silver is expensive, and this is also a problem to be solved in the development of the engine.

Therefore, the present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object thereof is to provide a roller with a cage that is inexpensive, has high wear resistance, and suppresses heat generation due to high-speed rotation. .

[0005]

[Means for Solving the Problems]

 The present invention relates to a roller with cage, which comprises a cage having a substantially cylindrical shape and a plurality of pockets formed parallel to the axial direction, and a roller having a roller inserted into each of the pockets. This is a composite plating film formed by finely dispersing and co-depositing fine particles.

[0006]

【Example】

 Hereinafter, a roller with cage as an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, the roller with cage according to the present invention has a substantially cylindrical shape, and a plurality of pockets 1 a are formed parallel to the axial direction and at equal intervals in the circumferential direction. It consists of a cage 1 and needle rollers 2 inserted into the pockets 1a. The size of the pocket 1a is slightly larger than the size of the roller 2 except for the size between the holding projections described later.

The retainer 1 connects two (retainer) circular ring portions 1b, both the circular ring portions 1b to each other, and defines the pocket 1a (of the retainer) together with each of the circular ring portions 1b. The pillar 1c is integrally molded. As is clear from FIGS. 3 and 4, the column 1c has a thick portion 1d connected to each of the annular portions 1b and a thin portion 1e interposed between the thick portions 1d. The thick-walled portion 1d and the thin-walled portion 1e define a substantially U-shaped recess 1f on the inner peripheral side of the cage 1. The thick portion 1d and the thin portion 1e are also shown in FIG. The recessed portion 1f is provided as a so-called thinned portion in order to reduce the weight of the cage 1, and reaches the outside of the pitch circle diameter (PCD) of the roller 2.

In the vicinity of both ends of the column 1c (of the cage), that is, in each thick wall portion 1d, inner holding projections 1g are formed on both sides of the inner surface, and the inner holding projections on the outer surface side are formed. A pair of outer retaining projections 1h is formed at a portion corresponding to the portion 1g. The inner holding protrusion 1g and the outer holding protrusion 1h protrude so as to face the pocket 1a, and the distance between the holding protrusions of the columns 1c (in the cage) adjacent to each other in the circumferential direction is small. It is set to be slightly smaller than the diameter of the roller 2. As a result, the core 2 is held and is prevented from falling out of the pocket 1a.

The inner retaining projection 1g and the outer retaining projection 1h are formed by providing two crimp grooves 1i and 1j on the inner and outer surfaces of the column 1c so as to extend in the circumferential direction. It is a thing. In this way, since each holding protrusion is formed only by caulking, it can be mass-produced and manufactured at low cost. Further, since the caulking grooves 1i and 1j act as so-called oil grooves (oil sumps), efficient lubrication is performed.

As is clear from each figure, both sides of each pillar 1c, more specifically, both sides of the thin portion 1e, have a predetermined length so as to widen a part of the pocket 1a defined by the pillar 1c. A recess 1k is formed. These recesses 1k act as oil grooves together with the caulking grooves 1i, 1j. However, in order to secure the rigidity of the thin portion 1e whose width dimension is reduced by providing the recess 1k, the thin portion 1e is secured. The thickness t ₁ (see FIG. 3) of is set to be slightly thicker.

As described above, since a large number of oil grooves are provided, sufficient lubrication is performed to prevent burning, which is suitable for high speed rotation.

As is clear from FIG. 3, the thickness t _{2 of the} thick portion 1d forming the pillar 1c together with the thin portion 1e is set to be as large as the thickness of the annular portion 1b. As a result, the shape is simplified, the cutting process is facilitated, and the manufacturing cost is low, and the rigidity of the column 1c as a beam is improved, and the caulking process is facilitated. Therefore, the inner retaining protrusion 1g and the outer retaining protrusion 1h can be molded with high precision, the amount of protrusion thereof is stable, and the roller 2 can be reliably retained.

FIG. 4 shows a use state in which the roller with cage is fitted to the shaft 5 and the outer ring 6, and in this use state, the rollers 2 are formed on both sides of the thick portion 1d. Contact with the guide surface of the roller C. D. It is guided above and is dimensioned so as not to come into contact with the inner and outer retaining projections 1g, 1h. Further, the dimensions are set so that the rolling surface of the outer ring 6 and the outer peripheral surface of the cage 1 contact each other before the inner peripheral surface of the cage 1 contacts the shaft 5.

In the roller with cage described above, the cage 1 is made of, for example, carburizing steel (SC M415, STKM13, etc.), and the roller 2 is made of bearing steel (SUJ2, etc.). To be done.

Then, by the plating treatment, as shown in FIG. 5, a composite plating film 11 is formed on the surface of the base material 10 of the cage 1. Note that FIG. 5 shows a state in which the actual size is enlarged, and the thickness of the composite plating film 11 is actually about 5 μm. The composite plating film 11 is formed by uniformly dispersing and co-depositing fine particles of fluororesin (tetrafluoroethylene) in a base material (matrix), and black dots in the figure represent fine particles of fluorine resin. White parts other than black dots represent the base metal.

Table 1 below shows the composition of the composite plating film 11. However, in this table, two types are shown, one having a high content of fluororesin (PTFE) (A type) and the other having a low content rate of the fluororesin (PTFE) (B type).

[Table 1]

As is clear from the above table, the base material of the composite plating film 11 is mainly composed of nickel (Ni: electroless) and contains phosphorus (P). The composite plating film 11 having the composition shown in the table is called Kaniflon (trademark: Nippon Kanigen Co., Ltd.), but various compositions can be used as long as it is a composite plating film in which fluororesin particles are dispersed and co-deposited. Needless to say, is applicable. Further, the nickel contained as the base material is not limited to the non-electrolyte, but may be the electrolyte. Further, a base material other than nickel can be used as the base material of the composite plating film.

Further, in the table, the hardness (Vickers hardness: HV) of the composite plating film 11 is shown both before and after the heat treatment. As is clear from the numerical values, The film hardness after the heat treatment is increased compared to before. However, regarding this hardness, the better results were obtained for the B type of the A type and the B type shown in Table 1.

As described above, in the roller with cage according to the present invention, with respect to the cage 1, the sliding contact portion with the roller 2 and the sliding portions with respect to the shaft 5 and the outer ring 6 which are other parts to be assembled with the roller 1. At the contact portion, a composite plating film 11 formed by dispersing and co-depositing fine particles of fluororesin is formed. In this way, the composite plating film containing fine particles of fluororesin has excellent self-lubricating properties, has high wear resistance, and can suppress the temperature that rises with rotation to a low level, so it can be installed in connecting rods of high-speed engine. It is suitable as a bearing and is expected to have a long service life. Further, since it has a large self-lubricating property as a general-purpose bearing, the above effect can be obtained even in a relatively low lubrication state or a non-lubricated state.

Burning of the roller with cage is due to the amount of heat generated by friction, and the roller with cage plated with the present invention and the conventional silver-plated cage of the same size as the roller. The centrifugal roller bearing tester was used to perform a durability pV value comparison test for the roller bearings. Here, p: contact pressure [N / cm ² ] on the outer peripheral surface of the cage V: sliding speed on the outer peripheral surface of the cage [m / s] With the above tester, the lubricating oil supply rate is kept constant and the pV value is increased. Then, the pV value when the roller with cage burns was obtained. As a result of the experiment, the roller with cage having the composite plating film according to the present invention obtained a value (below) about 1.9 times that of the conventional roller with cage of silver plating. This value corresponds to the pV value on the cage guide surface when the maximum engine speed n = 16,000 rpm / min (rpm) in the actual engine connecting rod.

[Equation 1]

In this case, as the roller with a cage as a test piece, those having the following major dimensions were used. Fw: inscribed circle diameter = 22 mm Ew: circumscribed circle diameter = 29 mm Bc: cage width = 17 mm Dw: roller diameter = 3.5 mm Lw: roller length = 13.8 mm Z: number of rollers = 14

The above-mentioned composite plating film 11 can be formed at a lower cost than the conventional plating film made of silver, and the cost reduction has been achieved. Further, the fluororesin particles contained in the composite plating film 11 have not only a self-lubricating effect but also a buffering effect, and thereby a sound deadening effect is obtained.

Next, a roller with cage according to a second embodiment of the present invention will be described with reference to FIG. The roller with cage is configured in the same manner as the roller with cage according to the first embodiment shown in FIGS. 1 to 4 except for the portions described below, and therefore the description as a whole is omitted. Only the main parts are explained. Further, in the following description, the same reference numerals are used for the same constituent members as those of the roller with cage according to the first embodiment.

As shown in the figure, in this roller with cage, a recess 1 m extending axially on the outer peripheral side of each column 1 c (of the cage) of the cage 1 and inside the outer retaining projection 1 h. Are formed. The recess 1m is formed over the entire width of the pillar 1c, and the depth e thereof is set to about 0.1 to 0.2 mm. This concave portion 1m also acts as an oil groove to improve lubricity, and it is less likely to cause burn-in or the like even when rotated at high speed. Further, by providing the concave portion 1m, the contact area with the inner diameter side of the connecting rod is reduced and the weight of the roller with cage is further reduced.

In each of the above embodiments, the composite plating film 11 is formed over the entire surface of the cage 1, but in addition to this, the composite plating film 11 may be formed only at a site where abrasion is likely to occur. .

[0027]

[Effect of device]

 As described above, in the roller with cage according to the present invention, since the composite plating film containing the fluororesin particles having excellent self-lubricating property is formed in the required portion, the wear resistance is high even in the low lubrication state. At the same time, the temperature that rises with rotation is suppressed to a low level, which is suitable as a bearing equipped on the connecting rod of a high-speed engine, and has the effect of prolonging its service life. Further, since the composite plating film can be formed at a lower cost than the silver plating which has been conventionally performed, the cost can be reduced. Further, since the fluororesin particles have a buffering function in addition to the self-lubricating function, a sound deadening effect can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a roller with cage according to an embodiment of the present invention.

FIG. 2 is a plan view of a part of the roller with cage shown in FIG.

FIG. 3 is a vertical cross-sectional view of a part of the roller with cage shown in FIG. 1 taken along a plane including the axial direction.

4 is a vertical cross-sectional view of a part of the roller with cage shown in FIG. 1 taken along a plane perpendicular to the axial direction.

5 is an enlarged cross-sectional view of a part of the roller with cage shown in FIG.

FIG. 6 is a vertical cross-sectional view of a part of a roller with cage according to a second embodiment of the present invention, taken along a plane including the axial direction.

[Explanation of symbols]

 1 Retainer 1a Pocket 1b Annular portion (of retainer) 1c Column (of retainer) 1f, 1k, 1m Recess 1g Inner holding protrusion 1h Outer holding protrusion 1i, 1j Caulking groove 2 (Needle-shaped) roller 5 axis 6 outer ring 10 substrate 11 composite plating film

Claims (2)

[Scope of utility model registration request] 1. A roller with cage, comprising a cage having a substantially cylindrical shape and a plurality of pockets formed parallel to the axial direction, and a roller inserted into each of the pockets, wherein a required portion is made of fluorine. A roller with cage characterized in that a composite plating film is formed by uniformly co-depositing fine particles of resin. 2. The roller with cage according to claim 1, wherein the base material of the composite plating film is mainly composed of nickel.