JPH1113751A - Solid lubricated cross roller bearing - Google Patents

Abstract

(57) [Problem] To provide a solid lubricated cross roller bearing which has a long service life and can be easily formed with a cage and assembled with a bearing. A plurality of rollers each having a V-shaped rolling groove (3, 4) provided on an opposing surface of an inner ring (1) and an outer ring (2) and a solid lubricating film (5) formed on a surface inserted between the V-shaped rolling grooves (3, 4). 6 and a ring-shaped cage 7 having a ring-shaped cage 7 having a roller insertion groove 7a, the ring-shaped cage 7 has a substantially similar shape to the shape surrounded by the V-shaped rolling grooves 3 and 4. A member made of a self-lubricating resin having a square cross-section and one side of this cross-section being smaller than the diameter of the roller 6 is provided in a roller insertion groove 7a.
The roller 6 is formed so that a sliding surface is formed on the bottom and side of the inner ring 1 from the surface facing the V-shaped rolling groove 3 toward the V-shaped rolling groove 4 of the outer ring 2 located on the opposite side. The V-shaped rolling grooves 3 and 4 are alternately arranged at different inclination angles in the circumferential direction of the V-shaped rolling grooves 3 and 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid lubricated cross roller bearing used under severe environmental conditions such as in a vacuum, under radiation, or in a high or low temperature environment.

[0002]

2. Description of the Related Art As shown in FIG. 6A, a first conventional example of a cross roller bearing has an inner ring 1 and an outer ring 2 opposed thereto, and two rolling rollers formed on the inner ring 1 and the outer ring 2 respectively. It is composed of a roller 60 for rolling the inner ring V-shaped rolling groove 3 and the outer ring V-shaped rolling groove 4 having running surfaces, and a structure using a metal ring-shaped retainer 70 for holding the roller 60. Has become. The ring-shaped retainer 70 shown in FIG. 6B is provided with an elliptical roller insertion groove 70a for tilting and rotatably holding the plurality of rollers 60.
The roller 60 performs a rolling motion between the inner ring 1 and the outer ring 2 with an axis inclined at 45 degrees to the center axis of the bearing as a rotation axis. Such a cross roller bearing is disclosed, for example, in Japanese Patent Application Laid-Open No. 63-57916. Further, as a second conventional example, as shown in FIG. 7, a spacer retainer 8 made of resin is used for holding a roller, and a curved groove in which adjacent rollers 61 are rotatably fitted on the left and right side surfaces of the spacer retainer 8. That is, the inclined contact surface 8
1, 82 are proposed (Japanese Utility Model Laid-Open No. 1-156314). As a third conventional example, a structure using a cylindrical or spherical spacer made of resin as shown in FIGS. 8 and 9 has been proposed.
The roller 62 inserted between the outer race V-shaped rolling grooves (not shown) is in contact with the cylindrical spacer 9 or the spherical spacer 10 at a point or a part by a line (for example, Japanese Utility Model Laid-Open No. 2-74625). , Actual opening 63-15382
4). As the material of the inner ring, the outer ring and the rollers, generally, an iron-based metal material such as SUJ2 or SUS440C is used. 57717, JP-A-5
As disclosed in, for example, 8-113629 and JP-A-61-55410, a thin film of a solid lubricant such as molybdenum disulfide, tungsten disulfide, and silver is treated.

[0003]

However, in the prior art as described above, since the end face of the roller performs a sliding motion with the rolling surface of the outer ring or the inner ring as a whole,
There is a problem that the solid lubricating film on the end face of the roller is easily worn, and the bearing life is short. In particular, since the roller receives a force on the outer ring side due to the rotation of the bearing, the abrasion between the rolling surface of the outer ring and the end face of the roller is large. Looking at the prior art individually, when the metal ring-shaped retainer of the first conventional example is used, the end face holding property of the roller 60 is good to some extent and the skew of the roller hardly occurs. Rubbing in the pocket 70a of the cage 70 tends to cause poor lubrication, and the roller 60 and the inner ring 2 or the outer ring 3 are seized to shorten the life of the bearing. In addition, due to restrictions on the cross-sectional structure of the bearing, the ring-shaped cage 70 must be thin, and a resin having lubricating properties but having a lower strength than metal cannot be used. Next, when the spacer retainer of the second conventional example is used, the skewing of the roller 61 is unlikely to occur due to the good retention of the roller 61, but it is difficult to form the spacer retainer 8 having a three-dimensional curved surface, There is a problem in that the assembly of the special retainer 8 and the roller 61, each of which requires a number of pieces, is complicated. Finally, in the case of using the resin-made cylindrical or spherical spacer rollers 9 and 10 of the third conventional example, the skewing of the rollers 62 is liable to occur due to poor holding of the rollers 62, and several tens of rollers are required. There is a problem that the assembly of the special retainer and the rollers, which requires a number, is complicated. Accordingly, the present invention provides a solid lubricated cross roller bearing that prolongs the life of the bearing by making the solid lubricating film on the end face of the roller and the skew of the roller less likely to occur, and that facilitates the molding process of the cage and the assembly operation of the bearing. The purpose is to provide.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an inner ring, an outer ring, and a V-shaped rolling member extending in a circumferential direction provided on opposing surfaces of the inner ring and the outer ring. A groove, and a plurality of cylindrical rollers inserted between the two V-shaped rolling grooves such that their axes intersect at right angles to each other;
A ring-shaped retainer having a roller insertion groove for guiding and holding the adjacent rollers between the V-shaped rolling grooves; and a part or all of the V-shaped rolling grooves of the inner ring and the outer ring and the surface of the roller. In a solid lubricated cross roller bearing having a solid lubricating film formed thereon, the ring-shaped retainer has a substantially square cross-section similar to the shape surrounded by the V-shaped rolling grooves of the inner ring and the outer ring, and The length of one side of this cross section is made of a member made of self-lubricating resin smaller than the diameter of the roller, and the roller insertion groove extends from the surface of the inner ring that faces the V-shaped rolling groove. It has a shape in which a part of a circular cross-section similar to the roller is cut out so as to form a sliding surface on the bottom and side portions of the outer ring toward the V-shaped rolling groove located on the opposite side of the groove. And the inclination angle in the circumferential direction of the two V-shaped rolling grooves. In which a plurality, disposed alternately changed. Further, the thickness of the roller insertion groove facing the V-shaped rolling groove of the inner race is 80% or less of the diameter of the roller.
The length is set to 95%. By means of the above means, an integrally formed ring-shaped retainer can be formed by using a resin having lower strength than metal through the connection of the bottom of the roller insertion groove. The integrated ring-shaped cage is easy to handle and easy to insert the roller, and the roller insertion groove can prevent skew of the roller. In addition, the ring-shaped retainer made of self-lubricating resin prevents the end surface of the roller from sliding with the rolling surface of the outer ring,
The lubricating component is transferred to the end surface and the outer peripheral surface of the roller. Thereby, the wear of the solid lubricating film on the end face and the outer peripheral face of the roller is reduced. As a result, the solid lubricated cross roller bearing has a longer bearing life, and the molding of the cage and the assembling work of the bearing are easy.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a bearing showing a part of an embodiment of the present invention, and FIG. 2 is a developed plan view showing a state in which a roller is provided in a roller insertion groove of a ring-shaped retainer.
3A to FIG. 5A correspond to A in FIG.
It is side sectional drawing which shows the state of arrangement | positioning of the ring-shaped retainer and a roller along line A ', BB', and CC ', and (b) is the side view seen from the right side of (a). 1 to 5, the same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. 5 is a solid lubricating film, 6 is a roller, and a solid lubricating film 5 of molybdenum disulfide is formed on the surface of the roller 6 by sputtering. The material of the inner ring 1, the outer ring 2 and the roller 6 is SUJ2 or SUS440C. Use something. Reference numeral 7 denotes a ring-shaped cage, and a plurality of rollers 6 adjacent between the V-shaped rolling grooves 3 and 4 of the inner ring 1 and the outer ring 2.
And has a substantially square cross section similar to the shape surrounded by the V-shaped rolling grooves 3 and 4 of the inner ring 1 and the outer ring 2 as shown in FIG. It is made of a member made of a self-lubricating resin whose one side length is smaller than the diameter of the roller 6. As shown in FIGS. 2 and 3, the roller insertion groove 7 a is provided with a V
The V-shaped rolling groove 3 has a shape in which a part of a circular cross-section similar to the roller 6 is cut out so as to form a sliding surface on the bottom and side portions of the V-shaped rolling groove 3. And 4, a plurality of them are arranged alternately at different inclination angles in the circumferential direction. In the roller insertion groove 7a, a part of the outer peripheral surface of the roller 6 is disposed so as to protrude in the thickness direction facing the V-shaped rolling groove 3 of the inner race 1. Also, the inner ring 1 of the roller insertion groove 7a
The thickness of the roller 6 facing the V-shaped rolling groove 3 is 8 mm of the diameter of the roller 6.
The length is set to 0% to 95%. Further, a solid lubricating film 5 made of molybdenum disulfide, tungsten disulfide, silver or the like is formed on the entire surface of the roller 6, and the direction of the inclination of the roller 6 is alternately changed one by one in the roller insertion groove 7 a of the ring-shaped retainer 7. They are arranged. The operation in such a configuration will be described. When the inner ring 1 and the outer ring 2 rotate relative to each other, the roller 6 moves in the V-shaped rolling grooves 3 and 4 while rotating while bearing a bearing load. At this time, the roller 6 rolls smoothly due to the solid lubricating action of the solid lubricating film 5 and the ring-shaped cage 7 made of a self-lubricating material. Roller 6
In order to receive the force on the outer ring 2 side with the rotation of the bearing, the end face of the roller 6 on the outer ring side slides with the bottom of the roller insertion groove 7 a of the ring-shaped retainer 7, Since the material of the container 7 has a self-lubricating property,
Wear of the solid lubricant film 5 on the surface is greatly reduced. As a result, especially the wear life of the solid lubricating film 5 on the end face of the roller 6 is improved, and the life of the bearing is extended. Since the ring-shaped retainer 7 made of a self-lubricating material is used, even if the solid lubricating film 5 is worn, the roller 6 hardly causes seizure. The ring-shaped retainer 7 can be formed by forming a ring having a square cross section from a resin extruded material by turning or the like, and then processing the roller insertion groove 7a with a drilling machine or by injection molding. Therefore, the ring-shaped retainer 7 has an integral shape due to the presence of the bottom of the roller insertion groove 7a, and is easy to handle when inserting the roller 6, and easy to assemble. The solid lubricating film 5 is divided into the inner ring 1 and the outer ring 2.
May be formed on the surface of each of the V-shaped rolling grooves 3 and 4.

[0006]

As described above, according to the present invention, the solid lubricated cross roller bearing has a substantially square cross section similar to the shape surrounded by the V-shaped rolling grooves of the outer ring and the inner ring, and A ring-shaped retainer made of a self-lubricating resin having a length of one side of the cross section smaller than the diameter of the roller, wherein the roller insertion groove extends from the surface of the inner ring facing the V-shaped rolling groove. Towards the V-shaped rolling groove of the outer ring located on the opposite side of the groove, it has a shape in which a part of a circular cross-section similar to a roller is cut out so as to form a sliding surface on its bottom and side, By changing the inclination angle in the circumferential direction of the two V-shaped rolling grooves, a plurality of
The thickness of the inner groove of the roller insertion groove facing the V-shaped rolling groove is set to a length of 80% to 95% of the diameter of the roller, and the rolling surface of the inner ring and the outer ring is further provided. In addition, a thin film of a solid lubricant such as molybdenum disulfide, tungsten disulfide, silver or the like is formed on part or all of the entire surface of the roller. According to the above-mentioned means, an integrally formed ring-shaped retainer can be formed by using a resin having lower strength than metal through the connection of the bottom of the roller insertion groove. The one-piece ring-shaped cage is easy to handle and easy to insert the roller, and the roller insertion groove also prevents skew of the roller.
Further, the ring-shaped retainer made of a self-lubricating resin prevents the end surface of the roller from sliding with the rolling surface of the outer ring, and transfers a lubricating component to the end surface and the outer peripheral surface of the roller. Thereby, the wear of the solid lubricating film on the end face and the outer peripheral face of the roller is reduced. As a result, the solid lubricated cross roller bearing has an effect that the bearing life is prolonged, and the work of forming the cage and assembling the bearing is facilitated.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a bearing showing a part of an embodiment of the present invention.

FIG. 2 is a developed plan view showing a state in which a roller is provided in a roller insertion groove of a ring-shaped retainer.

3A is a side sectional view showing a state of disposing a ring-shaped retainer and rollers along the line AA ′ in FIG. 2, and FIG. 3B is a side view seen from the right side of FIG. is there.

4A is a side sectional view showing a state of disposing a ring-shaped retainer and rollers along a line BB ′ in FIG. 2, and FIG. 4B is a side view viewed from the right side of FIG. is there.

5 (a) is a side sectional view showing a state of disposing a ring-shaped retainer and rollers along the line CC ′ of FIG. 2, and FIG. 5 (b) is a side view as viewed from the right side of FIG. is there.

FIG. 6A is a side sectional view of a bearing showing a first conventional example,
(b) is a perspective view of the ring-shaped retainer.

FIG. 7 is a plan view when a spacer retainer according to a second conventional example is used.

FIG. 8 is a side elevational view showing a third conventional example in which a columnar spacer is used.

FIG. 9 is a side elevational view in the case of using a spherical spacer showing a modification of the third conventional example.

[Explanation of symbols]

 1: inner ring 2: outer ring 3: V-shaped rolling groove 4: V-shaped rolling groove 5: solid lubricating film 6: roller 7: ring-shaped retainer 7a: roller insertion groove

Claims (2)

[Claims] 1. An inner ring, an outer ring, a V-shaped rolling groove extending in a circumferential direction provided on each of opposing surfaces of the inner ring and the outer ring, and an axial center between the two V-shaped rolling grooves. A plurality of cylindrical rollers inserted by intersecting at right angles to each other, and a ring-shaped retainer having a roller insertion groove for guiding and holding the adjacent rollers between the V-shaped rolling grooves. In a solid lubrication cross roller bearing in which a solid lubricating film is formed on part or all of the surface of the roller and the V-shaped rolling groove of the outer ring, the ring-shaped retainer includes a V-shaped rolling groove of the inner ring and the outer ring. Has a substantially square cross-section similar to the shape surrounded by
In addition, the length of one side of this cross section is made of a member made of self-lubricating resin smaller than the diameter of the roller, and the roller insertion groove extends from the surface of the inner race facing the V-shaped rolling groove, and A shape in which a part of a circular cross section similar to the roller is cut away toward the V-shaped rolling groove of the outer ring located on the opposite side of the rolling groove so as to form a sliding surface on a bottom portion and a side portion thereof. And a plurality of the V-shaped rolling grooves are arranged alternately at different inclination angles in the circumferential direction of the two V-shaped rolling grooves. 2. A thickness of the roller insertion groove facing the V-shaped rolling groove of the inner race is 80% to 95% of a diameter of the roller.
2. The solid lubricated cross roller bearing according to claim 1, wherein the length is set to be equal to%.