JPS63649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling a double-row ball bearing in which a predetermined radial clearance is obtained by combining a double-row outer ring, a double-row inner ring, and balls constituting the double-row ball bearing.

FIG. 1 shows a single row ball bearing 1, in which 2 is an outer ring, 3 is an inner ring, and 4 is a ball. In the symbols in the figure, A is the outer ring raceway diameter of the outer ring 2, B is the inner ring raceway diameter of the inner ring 3,
D indicates the diameter of the ball 4, and C indicates the radial clearance. The single row ball bearing 1 is generally assembled so that the following relationship holds.

C=A-B-2D (1) Let the standard dimensions of outer ring raceway diameter A, inner raceway diameter B, and ball diameter D be Ao, Bo, and Do, respectively, and the respective dimensions for each set standard dimension Ao, Bo, and Do. When the differences are a, b, and d, and the conditions A=Ao+a, B=Bo+b, D=Do+d, and Ao−Bo−2Do=0 are satisfied (1)
The formula is as follows.

C=a-b-2d (2) To assemble the single row ball bearing 1, select the outer ring raceway diameter difference a, the inner ring raceway diameter difference b, and the ball diameter difference d so as to satisfy the above equation (2). The generally used method is to assemble the outer ring 2, the inner ring 3, and the balls 4 so that a predetermined allowable value of the radial clearance C is obtained.

FIG. 2 shows a double-row ball bearing 5, which includes a double-row outer ring 6 and a double-row inner ring 7, which are double-row bearing rings.
It has a plurality of balls 8, and the inner surface of the double-row outer ring 6 is provided with double-row outer ring raceway grooves 9, 10, and the outer surface of the double-row inner ring 7 is provided with double-row inner ring raceway grooves 11, 12. A predetermined radial clearance C ₁ (not shown) is provided between the balls 8 and the outer ring raceway grooves 9, 10 or the inner ring raceway grooves 11, 12. In the symbols in the figure, A ₁ , A ₂
is the outer ring maximum raceway diameter of the double-row outer ring 6, B ₁ and B ₂ are the inner ring minimum raceway diameters of the double-row inner ring 7, D ₁ and D ₂ are the ball diameters of the balls 8,
R ₁ and R ₂ are the respective outer ring raceway groove radii of the outer ring raceway grooves 9 and 10, and r ₁ and r ₂ are the inner ring raceway grooves 11 and 1.
2, each inner ring raceway groove radius, P ₁ is outer ring raceway groove pitch, P ₂ is inner ring raceway groove pitch, θ ₁ , θ ₂
is the nominal contact angle when the double-row outer ring 6 and the double-row inner ring 7 are pressed in the radial direction. Generally, the radial clearance C ₁ of the double row ball bearing 5 is the outer ring maximum raceway diameter A ₁ ,
In addition to the factors A ₂ , inner ring minimum raceway diameter B ₁ , B ₂ and ball diameter D ₁ , D ₂ , outer ring raceway groove radius R ₁ , R ₂ , inner ring raceway groove radius r ₁ , r ₂ , outer ring raceway groove pitch P _1. It is determined by the influence of various characteristic factors based on machining dimensional errors such as outer ring raceway groove pitch _P2 . Therefore, in order to assemble the double-row ball bearing 5 so as to obtain a predetermined allowable value of the radial clearance C ₁ , it is necessary to assemble the double-row outer ring 6, the double-row inner ring 7, and the balls 8 among many different machining dimension characteristic values. The selection and assembly of the component parts consisting of the double-row outer ring 6, double-row inner ring 7, and balls 8 is more complicated than that for single-row ball bearings, and it is difficult to improve work efficiency. There are problems, the fit rate of component parts is poor, and it is necessary to perform a 100% inspection to guarantee the allowable value of the radial clearance of the assembled double row ball bearings, resulting in a high radial clearance defect rate. There were flaws.

The present invention is aimed at solving the above-mentioned drawbacks.
By selectively combining the outer ring raceway diameter difference with respect to the set standard raceway diameter of the outer ring, the inner ring raceway diameter difference with respect to the set inner ring set standard raceway diameter, and the ball diameter difference with respect to the set standard ball diameter, In the method of assembling a ball bearing to obtain radial clearance, two to three contacts are brought into contact in the circumferential direction of each raceway groove surface at the nominal contact angle position on the raceway groove surface of the double-row raceway ring. A total of 4 to 6 contacts are provided on the raceway groove surface, and among these contacts, the upper measurement part has two fixed contacts facing each other in the axial direction of the double-row raceway ring, and the remaining Measure the relative displacement in the radial direction of the raceway diameter of the double-row raceway ring with the lower measurement part where the contactor is fixed, and double the characteristic value obtained as the dimensional difference with respect to the set standard value of the raceway diameter of the double-row raceway ring. By using the difference in the raceway diameter of the row raceway ring and the difference in the raceway diameter of each double row raceway ring of the inner ring and outer ring and the difference in the ball diameter, it is easy to select and combine bearing components, and the component parts can be easily selected and assembled. An object of the present invention is to provide a method for assembling a double row ball bearing that has a high fitting rate and can easily obtain a radial clearance within a predetermined tolerance.

An embodiment of the present invention will be described below with reference to the drawings.

3 and 4 show a method for measuring the outer ring raceway diameter of a double-row outer ring 6, which is a double-row raceway ring, with reference numeral 21 as an upper measuring part, 22 as a lower measuring part, and upper measuring part 2.
1, two spherical upper contacts 23, 24 are fixed in the axial direction of the double-row outer ring 6, and the lower measuring part 22 has four spherical lower contacts 25, 26, 27, 28.
is permanently installed. The upper measuring section 21 is movable relative to the lower measuring section 22 in the radial direction above the double-row outer ring 6 in the figure, and the displacement amount of the upper measuring section 21 is indicated by the indicator 29. ing. The lower contacts 23, 24 and the lower contacts 25, 26, 27, 28 are arranged so that they can make contact at a predetermined nominal contact angle θ on each raceway groove 9, 10 surface of the double-row outer ring 6, As shown in FIG. 5, the center O ₁ of the upper contact 23 and the centers O ₂ and O 3 of the lower contacts 25 and 26, which contact the surface of one outer ring raceway groove 9 of the double-row outer ring ₆ , are two points. Lower contact 2
Form an isosceles triangle whose base is the straight line connecting the centers O ₂ and O ₃ of 5 and 26, and the other outer ring raceway groove 10
The center O ₄ of the upper contact 24 that contacts the surface and the centers O ₅ and O ₆ of the lower contacts 27 and 28 similarly form an isosceles triangle, and the centers O of the six contacts ₁ , O ₂ , ..., O ₆ are arranged at positions corresponding to the vertices of a hypothetical right prism whose end faces are isosceles triangles.

To measure the outer ring raceway diameter of the double-row outer ring 6, contact the upper contacts 23, 24 and the lower contacts 25, 26, 27, 28 with the outer ring raceway grooves 9, 10, and check the outer ring raceway diameter setting standard. Upper measuring section 2 for the value (measured value when measuring the setting standard master)
A displacement amount of 1 is indicated on the indicator 29. The characteristic value indicated by the indicator 29 in this way is the outer ring raceway diameter dimension difference a ₁ of the double-row outer ring 6, and the aforementioned outer ring maximum raceway diameters A ₁ , A ₂ , outer ring raceway groove radii R ₁ , R ₂ , It is measured as a representative characteristic value that combines the machining dimension characteristic values such as outer ring raceway groove pitch _P1 .

6 and 7 show a method of measuring the inner ring raceway diameter of the double-row inner ring 7, which is a double-row raceway ring, with reference numeral 31 being an upper measuring part, 32 being a lower measuring part, and upper measuring part 3.
1, two spherical upper contacts 33, 34 are fixed in the axial direction of the double-row inner ring 7, and the lower measuring part 32 has four spherical lower contacts 35, 36, 37, 38.
is permanently installed. The upper measuring section 31 is movable relative to the lower measuring section 32 in the radial direction above the double-row inner ring 7 in the figure, and the position of the upper measuring section 31 is indicated by an indicator 39. ing. The upper contacts 33, 34 and the lower contacts 35, 36, 37, 38 are arranged so that they can make contact at a predetermined nominal contact angle θ on each raceway groove 11, 12 surface of the double-row inner ring 7. Upper contactor 3 that contacts one inner ring raceway groove 11 surface of row inner ring 7
3 center O ₇ and the center of lower contacts 35, 36
O ₈ and O ₉ form an isosceles triangle whose base is the straight line connecting the centers O ₈ and O ₉ of the two lower contacts, and the upper contact 34 and the lower contact contact the other inner ring raceway groove 12 surface. The centers of the side contacts 37, 38 similarly form an isosceles triangle, and the centers of the six upper and lower contacts 33, 34, . . . , 38 form the end faces into an isosceles triangle. They are placed at positions corresponding to the vertices of a hypothetical right prism.

To measure the inner ring raceway diameter of the double-row inner ring 7, contact the upper contacts 33, 34 and the lower contacts 35, 36, 37, 38 with the inner ring raceway grooves 11, 12, and check the inner ring raceway diameter setting standard. The indicator 39 indicates the position of the upper measuring section 31 relative to the value.
The characteristic value indicated by the indicator 39 in this way is the inner ring raceway diameter dimension difference b ₁ of the double-row inner ring 7,
The machining dimension characteristic values such as the aforementioned inner ring minimum raceway diameters B ₁ and B ₂ , inner ring raceway groove radii r ₁ and r ₂ , and inner ring raceway groove pitch P ₂ are measured as a comprehensive representative characteristic value.

The outer ring raceway diameter difference a ₁ of the double-row outer ring and the inner ring raceway diameter difference b ₁ of the double-row inner ring measured as above,
The ball diameter difference d ₁ between the balls 8 combined with the double-row outer ring 6 and the double-row inner ring 7 and the predetermined radial clearance C ₁ is such that C ₁ =a ₁ −b ₁ −2kd ₁ (3) is satisfied. In addition, the double-row ball bearing in which the double-row outer ring 6, the double-row inner ring 7, and the balls 8 are combined can obtain a radial clearance _C1 within a predetermined tolerance. the above
k in equation (3) is a correction coefficient related to the set nominal contact angle θ. Generally, the correction coefficient is 1
For example, if k = 1 in equation (3), the value of k2 is expressed as the same equation as equation (2) above, so the assembly of a double row ball bearing is done in the same way as for a single row ball bearing. be able to. In other words, in the assembly method of double-row ball bearings, after measuring the outer ring raceway diameter difference and the inner ring raceway diameter difference in advance and sorting them according to the size difference, the outer ring raceway diameter difference and inner ring that match the arbitrary ball diameter difference are determined. The assembly methods include a selection matching method in which balls with different raceway diameters are selected and combined, and a random matching method in which ball diameter differences are selected and combined to match any outer ring raceway diameter difference and inner ring raceway diameter difference. become able to.

The method for assembling the double-row ball bearing of the present invention described above is based on the difference in outer ring raceway diameter with respect to the set standard raceway diameter of the outer ring, the difference in inner ring raceway diameter with respect to the set standard raceway diameter of the inner ring, and the difference in the inner ring raceway diameter with respect to the set standard raceway diameter of the ball. In a method of assembling ball bearings that obtains a predetermined radial clearance by complementary combination of radial dimension differences, the nominal contact angle position on the raceway groove surface of a double-row raceway ring is determined in the circumferential direction of each raceway groove surface. For example, a total of 6 contacts, 3 each, are brought into contact with each other, and among these contacts, the upper measuring element has two fixed contacts facing each other in the axial direction of the double-row bearing ring, and the remaining 4 contact elements. Measure the relative displacement in the radial direction of the double-row raceway with the lower measuring element with the contactor fixed to it, and calculate the characteristic value obtained as the dimensional difference from the set standard value of the raceway diameter of the double-row raceway. Assembling a single row ball bearing is possible by using the difference in the raceway diameter of the bearing ring and the difference in the raceway diameter of each double row bearing ring of the inner ring and the outer ring and the difference in the ball diameter to achieve a predetermined radial clearance. As with the method, selecting and assembling bearing components becomes easier, improving work efficiency, improving the fitting rate of component parts, and almost eliminating the occurrence of defective products due to radial clearance after assembly. Effects such as improved accuracy were obtained.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a longitudinal section of a single row ball bearing, Fig. 2 is a longitudinal sectional view of a double row ball bearing, and Figs. 3 to 7 are explanatory views of a double row ball bearing of the present invention. 3 to 5 are drawings showing an embodiment of the assembly method; FIG.
The figure shows a device for measuring the raceway groove dimensions of a double-row outer ring.
The figure is a front view, FIG. 4 is a sectional view taken along line AA in FIG. 3, FIG. 5 is an explanatory diagram showing the arrangement of the contacts in FIGS. 3 and 4, and FIGS. 6 and 7 are FIG. 6 is a front view, and FIG. 7 is a sectional view taken along the line BB in FIG. 6, of a device for measuring the raceway groove dimensions of a double-row inner ring. Explanation of symbols, 5...Double row ball bearing, 6...Double row raceway (double row outer ring), 7...Double row raceway (double row inner ring), 8...Ball, 9/10...Outer ring raceway Groove, 1
1.12...Inner raceway groove, 21.31...Upper measuring section, 22.32...Lower measuring section, 23.2
4, 33, 34...Upper contact, 25, 26, 2
7, 28, 35, 36, 37, 38...lower contact, θ...nominal contact angle.

Claims (1)

[Claims] 1 By selectively combining the outer ring raceway diameter difference with respect to the set standard raceway diameter of the outer ring, the inner ring raceway diameter difference with respect to the set standard raceway diameter of the inner ring, and the ball diameter difference with respect to the set standard ball diameter. In a method of assembling a ball bearing to obtain radial clearance, at least two bearings abutting each raceway groove surface in the circumferential direction at a nominal contact angle position on the raceway groove surface of a double-row raceway ring.
A total of at least four contacts are provided facing the double-row surface perpendicular to the axial direction of the double-row bearing ring,
Of the contacts, the double-row raceway ring has an upper measuring section in which two of the contactors facing each other in the axial direction of the double-row raceway are fixedly mounted, and a lower measuring section in which the remaining contacts are fixedly mounted on the double-row raceway ring. Measure the relative displacement in the radial direction of the double-row raceway raceway diameter, and set the characteristic value obtained as the dimensional difference with respect to the set standard value of the double-row raceway raceway diameter as the double-row raceway raceway diameter dimensional difference,
A method for assembling a double-row ball bearing, characterized in that the double-row ball bearing is assembled with a predetermined radial clearance by selectively combining the raceway diameter difference between the outer ring and the inner ring and the ball diameter difference.