JPH0626740Y2 - Rotating support - Google Patents

Description

[Detailed description of the device] [Industrial applications]

In this invention, a hollow hemispherical cage is provided with a large number of small-diameter hard spheres to slidably support a large-diameter hard sphere, and the cage includes the above-mentioned cage and covers beyond the diameter of the large-diameter hard sphere and has its tip end. The present invention relates to an improvement of a rotation support body in which a housing is set to have a diameter smaller than that of a large-diameter hard sphere, and a mounting screw is projecting outward on the bottom surface thereof.

[Prior art]

As a heavy-duty rotary support used for a runner that slides in a guide rail, it has been known that a large number of small-diameter rigid balls are provided in a cage to slidably support a large-diameter rigid ball. There is. However, if the small-diameter hard sphere sandwiched between the cage and the large-diameter hard sphere is not smoothly circulated, an unbalanced load may be concentrated on the small-diameter hard sphere and the small-diameter hard sphere may be damaged. The fragments of the small-diameter hard spheres enter the gaps of the other small-diameter hard spheres, causing the small-diameter hard spheres to be broken in a chain manner, and the large-diameter hard sphere cannot rotate. Therefore, in the component parts of the non-directional supporting trochanter of Japanese Utility Model Publication No. 51-21255, a race is formed with a partially spherical race and a ball ball circulation space that extends outward from the circular circumference of the race. It is disclosed that the plate member is integrally formed of an extension portion having a cylindrical surface with the maximum diameter portion returning in the direction of. However, in the above structure, since a space for circulation is required and the ball is extended to the outside of the large ball contact surface, the small ball escapes to the outside that is not in contact with the large ball and circulates. The surface that receives the ball becomes narrow, and the small ball must also have a small diameter with a small load capacity. Further, the race portion extends outward as compared with the contact surface with a small number of large balls, so that the diameter of the case cylinder becomes larger than the diameter of the large balls. In the case of a runner, since the area of the runner is constant, the number of supporting trochanters to be incorporated is small, and there is a drawback that the slipperiness of the runner deteriorates. Therefore, the applicant of the present invention has disclosed in Japanese Utility Model Laid-Open No. 62-110625 that a small-diameter hard ball that receives a large-diameter hard ball on the tip side of a saucer (retainer) can be circulated in the circumferential direction along a recessed portion, and has a small diameter. We proposed a ball bearing structure that can use a large diameter for a hard sphere and also reduce the size of the housing to increase the number of built-in runners. As a bearing structure, we were able to eliminate all the drawbacks of the conventional structure. However, in the rotary support configured as described above, the bottom of the housing is narrowed down to hold the central curved portion of the retainer, and the mounting screw is embedded in the bottom of the housing to project outward. Therefore, it is troublesome to set the cage at the optimum position of the housing due to molding error and mounting error, and when the rotary support is mounted on the runner, etc., the load can be reliably received if the mounting screw is off center. There was a risk of disappearing.

[Problems to be solved by the device]

The present applicant has completed the present invention as a result of further earnest development in view of the above circumstances, and its main problem is to easily attach the housing of the retainer and to assemble the retainer to a runner accurately. The purpose of the invention is to provide a rotary support that can be used.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a hollow hemispherical cage with a large number of small-diameter rigid balls interposed therein to slidably support a large-diameter rigid ball, and the diameter of a large-diameter rigid ball including the cage. (A) .The housing has a hollow cylindrical shape, and the housing has a tip that is smaller than the diameter of the large rigid sphere, and a mounting screw that projects outward from the bottom of the housing. A mounting screw is integrally molded at the center of the bottom surface, (b). The pedestal is fitted in the housing without a gap, and (c). The center curved portion of the cage is placed in the central hole of the pedestal. I am taking the technical means of.

[Action]

When the base is fitted inside the housing, the base fits tightly into the bottom of the housing. By fitting the central curved portion of the hollow hemispherical cage into the central hole of the pedestal, the cage is positioned on the bottom side of the housing. The tip of the housing is squeezed into a small diameter so that a large-diameter hard sphere does not fall out, and the rotary support is assembled. Since the mounting screw is integrally molded in the housing at the center position, the mounting screw does not deviate from the center (center of gravity position) of the housing due to an assembly error or the like.

【Example】

A preferred embodiment of the rotary support of the present invention will be described below with reference to the drawings. The rotary support 1 shown in FIG. 1 comprises a cage 5, small-diameter rigid balls 6, 6, 6 ..., A large-diameter rigid ball 7, and a housing 2 having a mounting screw 3. That is, the housing 2 has a substantially cylindrical shape, and the mounting screw 3 is integrally provided at the center of the bottom surface (at the center of gravity).
It is manufactured by integral molding. As a result, the mounting screw 3 can be accurately placed at the center of gravity of the rotary support. In addition, the inner bottom surface 20 of the housing 2 is provided with a substantially conical receiving portion 21 at its center (center) position. A pedestal 4 for positioning the cage 5 is fitted on the inner bottom surface 20 of the housing 1 with no space. As shown in FIG. 2, this pedestal 4 comprises a donut-shaped washer having an outer circumference equal to the inner diameter of the housing 2 and having a circular hole 4A in the center thereof. The holes 4A are arranged so as to form concentric circles with the receiving portion 21 of the inner bottom 40 as the center when they are fitted in without a gap. A hollow hemispherical cage 5 is placed in the hole 4A of the pedestal 4, and a small-diameter rigid ball 6 and a large-diameter rigid ball 7 are arranged.
The peripheral edge of the tip of the housing 2 is narrowed to be smaller than the diameter of the large-diameter hard sphere 7 so that the large-diameter hard sphere 7 can be held without falling off. Next, in the retainer 5, the tip of the central curved portion is the housing 2
Is engaged with the receiving portion 21 of the bearing 4, and the midway position of the curved portion abuts the peripheral edge of the hole 4A of the pedestal 4 and is positioned in the bearing posture. Here, the cage 5 has a large number of small rigid balls 6 inside.
6 and 6 are placed on this small-diameter hard ball 6, 6, and 6.
A large-diameter hard sphere 7 is placed so as to come into contact with ... so that they can slide relative to each other. In the case of this embodiment, the cage 5 has a curved top portion in the central portion.
10, a curved peripheral wall portion 11 connected to the curved peripheral wall portion 11, and a concave portion 12 formed on the tip edge portion 13 side. That is, as can be seen more clearly in FIG. 3, the curved apex 10 is an arc drawn as a radius by adding the diameter of the small-diameter hard sphere 6 to the radius of the large-diameter hard sphere 7, that is, a substantially concentric circle with the large-diameter hard sphere 7. It is set to have a curvature, and an interval l ₁ is provided between it and the hard sphere 7 having a large diameter. Further, the curved peripheral wall portion 11 connected to the curved top portion 10 is set to have a curvature larger than the curvature of the curved top portion 10, and the interval l ₂ with the large-diameter rigid sphere 7 is larger than the diameter of the small-diameter rigid sphere 6. Has become. The tip edge portion 13 extending from the curved peripheral wall portion 11 is provided with a small-diameter rigid ball 6, 6, 6 ... Interposed so that the interval l ₃ with the large-diameter rigid ball 7 is set smaller than the diameter of the small-diameter rigid ball 6. Is prevented from falling out (actually, inside the housing 2). An annular recess 12 formed in the horizontal direction is formed on the tip edge 13 side. The distance between the recessed portion 12 and the large-diameter hard sphere 7 is set to be slightly larger than the diameter of the small-diameter hard sphere 6, and the large-diameter hard sphere 7 comes into contact with the guide rail or the like and slides when it slides. It receives the hard sphere 6 and is annularly supported at a horizontal position. At this time, the small-diameter hard sphere 6 housed in the recess 12 forms a slight gap with the large-diameter hard sphere 7. With the above configuration, when the large-diameter rigid sphere 7 slides, the small-diameter rigid sphere 6 on the curved top portion 10 side moves toward the tip edge portion 13 side along the curved peripheral wall portion 11. Here, even if the small-diameter hard sphere 6 comes into contact with the large-diameter hard sphere 7, the clearance is widened downward, so that the small-diameter hard spheres 6, 6, 6 ... Are clogged as in the case of setting the concentric curvature. The possibility of being unable to rotate is eliminated. Further, the small-diameter rigid balls 6, 6, 6 ... On the tip side are fitted into the recessed portion 12 and bearing the large-diameter rigid ball 7 in an annular shape at a fixed position. Then, the small-diameter rigid ball 6 housed in the recessed portion 12 can receive the large-diameter rigid ball 7 and circulate in an annular shape along the recessed portion 12. Therefore, the load applied to the large-diameter rigid sphere 7 is evenly distributed to the small-diameter rigid spheres 6, 6, 6 ... 4 and 5 show an application example in which the ball bearing structure of the present invention is used for a runner. The runner 8 shown in FIG. 3 has a structure in which seven large-diameter hard balls 7 using the ball bearing structure of the present invention are concentrically arranged at equal intervals. The runner 9 shown in FIG. 3 has a structure in which the large-diameter hard balls 7 are arranged at four corners, and two rollers R whose rotation axes are orthogonal to each other are arranged between them. You can. In this case, the housing having the ball bearing structure can be made as small as possible along the large-diameter rigid sphere, so that a large number of ball bearings can be incorporated in the runner. Further, since the mounting screw is accurately provided at the center of gravity of the rotary support, the load applied to the runner can be efficiently received by the rotary support. In addition, the use of the ball bearing structure of the present invention is not limited to the above-mentioned embodiment, and it can be used as a sliding member or a bearing member in an appropriate structure and is excellent in versatility.

[Effect of device]

Since the cage is housed in the housing integrally formed with the mounting screw via the washer, the bearing posture of the cage can be easily set at the time of assembling the rotary support. Further, since the mounting screw is formed integrally with the housing, it can be accurately arranged at the center of gravity of the rotary support. This facilitates the work of assembling the rotary support, is suitable for industrial mass production, and has excellent cost performance. Further, since the mounting screw of the rotary support is accurately mounted at the position of the center of gravity, even if the rotary support is incorporated into a runner or the like, a heavy load can be efficiently received, which is extremely useful.

[Brief description of drawings]

1 is a sectional view showing a preferred embodiment of the rotary support of the present invention, FIG. 2 is an exploded sectional view showing a state in which a pedestal is attached to a housing, and FIG. 3 is a gap between a cage and a large-diameter hard ball. FIG. 4 is an enlarged partial explanatory view of a main part, FIG. 4 is an application example to a runner using a ball bearing structure, and FIG. 5 is an application example to a runner to which a roller is further added. 1 …… Rotary support 2 …… Housing 3 …… Mounting screw 4 …… Pedestal 5 …… Cage 6 …… Small diameter hard ball 7 …… Large diameter hard ball 8 …… Runner 9 …… Runner 12 …… Concave Department

Claims (2)

[Scope of utility model registration request] 1. A hollow hemispherical cage is provided with a large number of small-diameter hard spheres for slidably bearing a large-diameter hard sphere, and the cage including the cage is covered over the diameter of a large-diameter hard sphere. In a rotary support where the tip is set smaller than the diameter of the above-mentioned large diameter hard sphere, and the mounting screw is projected outward on the bottom surface, the housing has a hollow cylindrical shape and the mounting screw is integrally molded on the bottom surface. At the same time, the pedestal is fitted into the housing without any gap, and the central curved portion of the cage is placed in the central hole of the pedestal. 2. A cage is characterized in that a recessed portion having a substantially U-shaped cross section is annularly formed at a tip portion thereof.
Ball bearing structure as described.