JPH0960647A - Crossed roller bearing with flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the fixation of an inner ring to a shaft and of an outer ring to a housing and to prevent abnormal resistance from acting on a roller by providing an annular groove having a square sectional form, which is formed out of a V-shaped recessed groove of the inner ring and a V-shaped recessed groove of the outer ring, with a plurality of short, cylindrical rollers inserted into the groove in such a manner that they intersect at a right angle with each other in three dimensions. SOLUTION: An outer ring 3, which is formed by coaxially piling a pair of symmetric annular members divided into two by means of a right and left, symmetric plane, is coaxially fitted into a center hole of a housing 12, whose center hole is fitted to a corner-cut-off and stepped part of its front surface, by means of a plurality of installation bolts 3b, which are inserted into a plurality of axial bolt holes 3a which are made in a thick-wall web part W3 of the outer ring 3 at an equal interval and in the circumferential direction. Meanwhile, a plurality of short cylindrical rollers having equal diameter and length are inserted into an annular hole, which is formed out of a V-shaped recessed groove 5 of an inner ring 2 and a V-shaped recessed groove 5 of the outer ring 3, which is inclined is inclined by an angle of 90 deg., and which has a square sectional form, via an annular retainer at such a relative position as the rollers intersect at a right angle with each other in three dimensions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flanged cross roller bearing which is a rotary bearing that also serves as a thrust bearing.

[0002]

2. Description of the Related Art As a flanged cross roller bearing, which is a rotary bearing that also serves as a thrust bearing, various structures have been known. As an example thereof, Japanese Patent Laid-Open No. 5-273222 can mention a cross roller bearing as shown in the vertical sectional view of FIG. 5 adopted in an anti-roll brake system (ABS) used in an automobile. Recently, ABS has been adopted in an increasing number of automobiles. This system is intended to prevent wheel lock by automatically releasing the brake pressure when sudden braking is applied to maintain the stability and direction of the vehicle. An integral part of the ABS is the wheel speed sensor to send power to the ABS for controlling axle rotation. Most passenger cars have one wheel speed sensor for each of the four wheels, and by inputting a signal from this sensor, ABS determines whether the wheel is locked or is about to be locked. , The braking force can be controlled. Wheel speed sensors are also used in traction control systems to prevent wheel slip during acceleration.

This type of wheel bearing-hub device 010 is used for non-driving wheels, and as shown in the vertical sectional view of FIG.
The outer ring 012 of the bearing is provided with a wheel mounting flange 014, and a plurality of holes 016 for inserting a wheel mounting bolt are formed in this flange 014. 018
Is a coaxial bearing composed of a pair of front and rear cylindrical members 020 and 022, and is fitted to a spindle 024 of a wheel that does not rotate as an inner ring, and the spindle 024 is attached to the vehicle body through its attachment flange 026. Outboard balls 030 and inboard balls 032 are respectively formed by the rolling elements. A region in which the balls 030 and 032 are accommodated in the bearing to the hub device 010 is shielded from the outside by a pair of front and rear seals. Although the seal member is not shown in FIG. 6, it has the same structure as the conventional one, and the main body is press-fitted into the outer ring 012.
The lip is in contact with the bearing 018 or the spindle 024. The outer periphery of the spindle 024 has a shape in which the bearing 018 is sandwiched by the screw portions, and when used,
The hub device 010 is prevented from falling off the spindle 024.

The structure of the conventional cross roller bearing shown in FIG. 5 will be described. First, in the vertical sectional view of FIG. 6, the cross roller bearing 050 has a known structure, and the inner ring 051 has a V-shape with a groove angle of 90 °. A pair of front and rear outer rings 052a and 052b and short columnar rollers 053 are inserted alternately (orthogonally) through a retainer (not shown). The pair of outer rings 052a and 052b are bolts (not shown). Are integrally formed by.

At the rear end of the shaft 055, a step for fitting the inner ring 051 of the cross roller bearing 050 is cut into corners, a plurality of bolt holes 055a are provided on the side surface circumference, and a pair of outer rings 052a are provided at the front end of the housing 056. , 052b are stepped into corners, a plurality of bolt holes 056a are provided on the side surface circumference, the retainer 057 has a stepped shape, and fixing holes 057a are provided. In such a structure, the inner ring 051 of the cross roller bearing 050 is fitted in the rear end of the shaft 055, and the retainer 057 and the inner ring 0
After adjusting the shim 059 so that the contact surfaces of 51 are parallel, the retainer 057 is fixed with the bolt 058. The outer ring 052 of the cross roller bearing 050 is fitted in the stepped hole of the housing, the shim 059 is adjusted so that the contact surfaces of the retainer 057 and the outer ring 052 are parallel, and then the retainer 057 is fixed with the bolt 058. The shaft 055 is rotatable via the cross roller bearing 050 supported by 056. As shown in FIG. 7, there is a gap δ ₀ between the cross roller bearing and the retainer 057 depending on the processing size of the housing, so shim adjustment is necessary. Also, as shown in FIG.
If you tighten the retainer while it is inclined, the retainer will be deformed by the tightening force of the bolt.

[0006]

By the way, in the cross roller bearing for supporting a wheel having such a structure,
There are the following problems. (1) The outer ring of the wheel bearing has a wheel mounting flange, but the inner ring has a structure in which it is inserted into the shaft and tightened with nuts.
After tightening, it is necessary to take measures to prevent the nuts from loosening, which makes assembly and disassembly work troublesome. (2) The retainer used as the fixing means for the cross roller bearing requires shim adjustment depending on the difference in the thickness of the bearing and the depth of the fitting portion. Due to incomplete shim adjustment, a gap is created between the contact surface of the bearing side and the retainer surface, and the gap serves as a play part of the outer ring, so that the outer ring is not fixed and the rotation accuracy deteriorates. (3) If a gap is created between the front surface of the housing and the rear surface of the retainer, the retainer is deformed by the fastening force of the fixing bolt, and the front surface of the pair of front and rear outer rings 52 comes into contact with the contact surface of the retainer in an inclined state. Abnormal pressure is applied to the roller of the bearing, and the normal state cannot be maintained, resulting in a decrease in life due to an increase in rotation resistance.

The present invention has been proposed in view of such circumstances, and facilitates assembling and disassembling work to ensure the fixation of the inner ring to the shaft and the outer ring to the housing, and at the same time, the roller has an abnormal resistance. It is an object of the present invention to provide an economical cross roller bearing with a flange, which has a simple structure for preventing the operation, a small number of parts, a low cost and a long life.

[0008]

To this end, the invention of claim 1 is such that a relatively short-diameter thick-walled short cylindrical flange portion extending in the front-rear direction and an inward radial direction projecting on the front-rear end faces of the flange portion. Thickness L consisting of a thick web portion that is circumferentially provided
It is an inner ring having a cross section that forms a V-shaped outer shape, has a right-angled V-shaped groove formed on the outer peripheral surface of the flange portion, and has concentric steps at one of the front and rear end corners of the web portion. An inner ring having a relatively small-diameter profiled thick-walled L-shaped cross section that is cut around and inserted into a plurality of axial bolt holes penetrating the thick-walled web portion of the inner ring at equal circumferential intervals. The axial shaft is coaxially fitted to the above-mentioned one corner cut step portion by a plurality of mounting bolts, and the outer surface of the flange portion of the inner ring has an outer radial clearance to be coaxial. It has a thick-walled flange part that is externally inserted and is formed on the inner peripheral surface of a right-angled V-shaped groove, and has a thick-walled web part that is peripherally arranged on the outer peripheral surface. Outer ring having a relatively large-diameter thick-walled L-shaped cross section with a relatively large diameter The same axis perpendicular plane through the lower end of the groove bottom of each V-shaped groove of the wheel being symmetrically about 2 minutes before and after 1
An outer ring formed by coaxially fixing a pair of substantially symmetrical annular members, and a plurality of inner rings inserted into a plurality of axial bolt holes penetrating the thick-walled web portion of the outer ring at equal circumferential intervals. Alternating into a square cross-section annular groove formed by the housing in which the center hole is fitted to the corner cut stepped portion of the rear surface by the mounting bolt, and the V-shaped groove of the inner ring and the V-shaped groove of the outer ring. And a plurality of short cylindrical rollers having the same diameter and the same length, which are interpolated so as to be three-dimensionally orthogonal to each other.

The invention of claim 2 is characterized in that, in claim 1, the inner ring and the outer ring are inscribed in substantially the same rectangular cross-sectional contour.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to the ABS will be described with reference to the drawings. FIG. 1 is a partial vertical sectional view thereof, and FIG. 2 is an overall vertical sectional view showing inner and outer rings of a cross roller bearing of FIG. FIG. 3 is an overall side view showing the assembled state of the cross roller bearing of FIG. 2, and FIG. 4 is the embodiment and modification of the present invention shown in FIGS. 1 to 3, and the cross roller bearing shown in FIG. FIG. 6 is a longitudinal sectional view for comparison with FIG.

First, as shown in FIGS. 1 and 2, a cross roller bearing 1 is composed of an inner ring 2 having a relatively small diameter, an outer ring 3 and a roller 4 having a relatively large diameter, and the inner ring 2 has an outer diameter A and an inner diameter B. , Ring-shaped with a thickness C, V-shaped groove 5 into which the roller 4 is inserted is provided on the outer peripheral surface, and C × F is provided on the outer peripheral portion.
A flange portion f ₂ having a flat rectangular cross section of ₀ is formed, and a recess having an outer diameter B ₁ and a depth C ₂ is formed in the inner peripheral portion continuously with the flange portion f ₂ , and the inward radial direction length is increased. Size F x thickness C
_By forming the web portion w ₂ having a square cross section of _1, an inner ring composed of a rim portion r ₂ having a thick T-shaped cross section is formed as a whole. Then, a plurality of bolt holes 2a are provided at equal intervals on the concentric circumference of the width F of the inner ring of the web portion w _2. That is, the inner ring 2 is a thick-walled web portion that is provided so as to project radially inward on the front-rear symmetry plane of the thick-walled short cylindrical flange portion f ₂ having a relatively small diameter in the left-right direction and the flange portion f _2. An inner ring having a cross section of a thick convex shape composed of w ₂ and having a V-shaped groove formed on the symmetry plane of the flange portion f ₂ thereof, and before and after the web portion w ₂ . A rim portion r ₂ having a relatively small-diameter, thick-walled T-shaped cross-section, which has a relatively small diameter, is formed by forming a step at each of inner corners of the surface and the center hole. The inner ring 2 has a plurality of axial bolt holes 2 formed through the thick web portion at equal intervals in the circumferential direction.
A rim portion r is formed by a plurality of mounting bolts 2b inserted in a.
It is fitted to the rear end of the shaft 11 at the _two corner cutting step portions.

The outer ring 3 has a ring-shaped cross section with an outer diameter D, an inner diameter E and a thickness C, and has an outer diameter D ₁ and a depth C on the left and right side surfaces of the outer peripheral portion.
₂ dents are provided on the front and rear surfaces, and outer diameter D, inner diameter D ₁ , thickness C
_The portion formed by ₁ is referred to as a web portion w ₃ . Web part w
Portion of the flat rectangular cross-section of the ₃ consecutive G ₂ × C is flange f _3, the outer ring 3 made of a thick T-shaped rim portion r ₃ consisting of a flange portion f ₃ and web portion w ₃ Overall Assembly For convenience of description, the outer ring 3 is divided into two parts in a front-rear direction on a plane orthogonal to the axis, and the two half parts are coaxially heavy and integrated by bolts (not shown). Its located on the symmetry plane of the flange portion is a V-shaped groove 5 peripheral equipment, also the plurality of bolt holes 3a at equal intervals on a concentric circle in the web portion w ₃ is pierced, the respective bolts 3a As shown in FIG. 1, the outer ring 3 is fixed to the housing 12 by being inserted into the center hole of the housing 12 by the inserted bolt 3b. That is,
In other words, the outer ring 3 has a V-shape that is coaxially and externally inserted on the outer surface of the flange portion f ₂ of the inner ring 2 in the outward radial direction and on the same left-right symmetry surface and is provided around the inner peripheral surface. A relatively large-diameter variant having the same cross-sectional shape symmetrical with the cross-sectional shape of the inner ring 2 having a thick-walled portion f ₃ formed with a groove and having a thick-walled web portion w _{3 provided} around the outer peripheral surface. It has a thick T-shaped cross section. However, as described above, the outer ring 3 does not consist of a single member, and is the same as an outer ring formed by coaxially weighing a pair of symmetrical annular members that are symmetrically bisected by a bilateral symmetry plane. A center hole was fitted to the front corner cutting step by a plurality of mounting bolts inserted in a plurality of axial bolt holes penetrating through the thick web portion w ₃ of the outer ring at equal intervals in the circumferential direction. It is coaxially fitted in the center hole of the housing.
Then, a plurality of short cylinders of equal diameter and equal length inserted in the annular hole of 90 ° inclined square section formed by the V-shaped groove of the inner ring 2 and the V-shaped groove of the outer ring 3. The rollers are inserted through an annular retainer (not shown) at a relational position where the rollers alternately intersect with each other.

Thus, the cross roller bearing 1 is
After being assembled as shown in FIG. 3, the inner ring 2 has a plurality of bolts 2b on its web member w ₂ as shown in FIG.
Is fixed to the rear end of the shaft 11 by being fitted to the outer ring 3
It is secured in a state fitted to the housing 12 by a plurality of bolts 3b at the web portion w _3.

At this time, as shown in FIG. 1, the web portion w ₃ of the outer ring 3 is fitted into the center hole of the housing 12 so that the axes of the cross roller bearing 1 and the housing 12 are aligned with each other. The shaft 11 is rotatably or swivelably held in the housing 12 via a flanged cross roller bearing 1.

According to this structure, the inner ring flange portion and the web portion are provided with the fitting portion and the fixing surface, respectively.
The outer ring flange part and the web part, which are made of a pair of front and rear, are integrally fixed to the corresponding shaft end and the fitting hole of the housing with the fixing bolts without using the retainer. Even if a combined load of axial load, radial load, and moment load generated in the swivel portion and the indirect portion is applied, highly rigid rotation or swiveling operation can be transmitted without any problem.

FIG. 4 shows the embodiment of the present invention as compared with the conventional cross roller bearing shown in FIG.
, And in the figure, (A), (B),
(C) shows an embodiment and a modified example of the present invention, respectively, and (D) shows a conventional cross roller bearing. Here, in the figure (A), a concave hole is formed in the front end surface of the inner ring for inserting the rear end of the shaft, whereas in the figure (B), the rear hole of the inner ring is formed. A concave hole is formed in the end face for inserting the front end of the shaft therein. On the other hand, the same figure (C)
Has a structure in which the rear end surface of the shaft is abuttingly fitted to the front end surface of the inner ring by a plurality of bolts, and its entire cross-sectional view is a flat rectangle. However, in the figure (D), the outer diameter of the outer ring is the same as the figure (A), (B), (C).
2δ _D shorter than.

[0017]

According to the flanged cross roller bearing of the present invention, the following effects can be obtained. (1) The cross roller bearing with a flange can be mounted on the shaft and the housing without adjusting the shaft center by fitting the fitting portions provided coaxially with the inner ring and the outer ring into the shaft end and the center hole of the housing, respectively. Holds the normal relative position of and is fixed by bolts. Therefore, the overall assembly is performed with high accuracy, speed and reliability. (2) The number of parts is small, the structure is simple and the cost is low. (3) Assembly and disassembly work can be done quickly and easily. (4) The roller is a short columnar roller whose diameter is equal to the axial length and whose side view is a square, and no abnormal force acts on each roller. Therefore, the rollers have strong pressure resistance and cross roller bearings. Has a long life. (5) Regardless of the magnitude of axial thrust, radial load, and bending moment, it is possible to easily adopt the same size specifications. (6) Particularly suitable for heavy loads. (7) Since the base angle θ of the concave groove of the inner and outer rings is 90 °, it is possible to exhibit substantially the same mechanical versatility with respect to the axial load and the radial load. (8) The cross roller bearing is fixed in a normal state, and smooth rotation or swiveling operation with high rigidity is smoothly transmitted even if a composite load generated in the rotating part, swiveling part, or joint part of a robot is applied. It is possible to improve the accuracy and life of the cross roller bearing, reduce the man-hours required for assembly and adjustment by simplifying the shapes of the shaft and the housing, and reduce the cost, and to facilitate the maintenance.

In short, according to the first aspect of the invention, a relatively small diameter thick short cylindrical flange portion extending in the front-rear direction and the front and rear end faces of the flange portion are provided so as to project radially inward. An inner ring having a thick L-shaped cross section composed of a thick web portion, a right-angled V-shaped groove formed on the outer peripheral surface of the flange portion, and front and rear end angles of the web portion. An inner ring having a relatively small-diameter, thick-walled L-shaped cross-section, in which concentric steps are provided around one of the corners, respectively, and a thick-walled web portion of the inner ring is provided at equal intervals in the circumferential direction. The front and rear shafts whose shaft ends are coaxially fitted to the one corner cut step portion by the plurality of mounting bolts inserted in the plurality of axial bolt holes, and the outer radius of the outer surface of the flange portion of the inner ring. A right angle that is coaxially externally inserted around the inner peripheral surface with a gap in the direction Relatively large-diameter thick wall with a thick-walled flange with a V-shaped groove and a thick-walled web around the outer surface, and a cross-sectional shape that is almost symmetrical to the cross-section of the inner ring. An outer ring having an L-shaped cross section, and a pair of substantially symmetrical annular members which are symmetrically bisected by a plane perpendicular to the same axis passing through the bottom ends of the V-shaped concave grooves of the inner ring and the outer ring. The outer ring, which is fixed coaxially to the outer ring, and the corners of the rear surface by the multiple mounting bolts inserted in the multiple axial bolt holes penetrating the thick web of the outer ring at equal intervals in the circumferential direction. A housing in which a central hole is fitted to the cut step portion,
A plurality of short circles of equal diameter and equal length that are inserted so as to alternate three-dimensionally with an annular groove of square cross section formed by the V-shaped groove of the same inner ring and the V-shaped groove of the same outer ring The columnar roller facilitates assembly and disassembly work, secures the inner ring to the shaft and the outer ring to the housing, and prevents abnormal resistance from acting on the roller. INDUSTRIAL APPLICABILITY The present invention is extremely useful industrially because a flanged cross roller bearing having a small number of points, low cost and long life can be obtained.

According to the invention of claim 2, in claim 1, the inner ring and the outer ring are inscribed in substantially the same rectangular cross-section contour, respectively. The present invention is extremely useful in industry because it can withstand directional loads and operate.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is an overall vertical sectional view showing inner and outer rings of the cross roller bearing of FIG.

FIG. 3 is a plan view of FIG. 1 showing a fixing procedure of the cross roller bearing of FIG.

4 is a comparative longitudinal sectional view of the cross roller bearing of the present invention shown in FIGS. 1 to 3 and the conventional cross roller bearing shown in FIG.

FIG. 5: Anti-roll brake system for automobiles (AB
It is the whole longitudinal cross-sectional view which shows the conventional ball roller bearing used for S).

6 is a schematic enlarged view showing a cross roller bearing using a cross roller instead of the balls of FIG.

FIG. 7 is a cross-sectional view showing a defect in the clearance between the retainer and the outer ring in FIG.

FIG. 8 is a sectional view showing a defective deformation of the retainer in FIG. 6 of the prior art.

[Explanation of symbols]

1 Cross Roller Bearing 2 Inner Ring 2a Bolt Hole 2b Bolt 3 Outer Ring 3a Bolt Hole 3b Bolt _3L Outer Ring Left Half 3 _R Outer Ring Right Half 4 Roller 5 Right Angle V-Shaped Groove 6 Square Groove Annular Groove 11 Shaft 12 Housing f ₂ Inner ring flange part f ₃ Outer ring flange part r ₂ Inner ring rim part r ₃ Outer ring rim part w ₂ Inner ring web part w ₃ Outer ring web part θ Bottom angle of V-shaped groove of inner and outer rings

Claims (2)

[Claims] 1. A thickness comprising a relatively small-diameter thick-walled short cylindrical flange portion extending in the front-rear direction, and a thick-walled web portion projecting radially inwardly on the front-rear end faces of the flange portion. It is an inner ring having a cross section that forms an L-shaped contour, has a right-angled V-shaped groove formed on the outer peripheral surface of the flange portion, and has a concentric step at one of the front and rear end corners of the web portion. An inner ring having a relatively small-diameter, irregularly-shaped and thick-walled L-shaped cross section, which is formed around each corner, and a plurality of axial bolt holes formed through the thick-walled portion of the inner ring at equal circumferential intervals. The front and rear direction shaft, whose shaft end is coaxially fitted to the one corner cut step portion by a plurality of internally mounted mounting bolts, and the outer surface of the flange portion of the inner ring are coaxial with an outward radial gap. -Thick flan with a right-angled V-shaped groove grooved on the inner surface An outer ring having a relatively large-diameter, thick-walled L-shaped cross section having a cross section substantially symmetrical to the cross section of the inner ring and having a thick web portion circumferentially provided on the outer peripheral surface of the outer ring. An outer ring formed by coaxially fixing a pair of substantially symmetrical annular members, which are symmetrically divided into two parts by a plane perpendicular to the same axis passing through the lower ends of the bottoms of the V-shaped concave grooves of the inner ring and the outer ring. The center hole is fitted to the corner cut step on the rear surface by a plurality of mounting bolts inserted in a plurality of axial bolt holes penetrating through the thick web portion of the outer ring at equal intervals in the circumferential direction. And a plurality of equal diameters, etc., inserted so as to be three-dimensionally orthogonal to the annular groove of square cross section formed by the V-shaped groove of the inner ring and the V-shaped groove of the outer ring A cross roller bearing with a flange, characterized by having a long short cylindrical roller. 2. The cross roller bearing with a flange according to claim 1, wherein the inner ring and the outer ring are inscribed in substantially rectangular cross-section contours, respectively.