JP2004052788A - Pin type retainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pin type retainer capable of enhancing the durability of its pin by coupling it with a ring strongly. <P>SOLUTION: The pin type retainer includes a first ring 10 furnished with through holes 11 in several positions in the circumferential direction, and a recess 32 in a countersunk form is provided at one end of the pin 30. In the condition that the end of the pin 30 is inserted from inside into any through hole 11 in the first ring 10, a wedge member 40 is fitted in the recess 32 in the pin 30. Owing to the effect of the wedge member 40, the part around the pin end is enlarged diametrically and fixed in pressure contact by surfaces to the internal surface of the through hole 11 in the first ring 10. This enhances the joining strength of the pin 30 with the first ring 10, and when an impact load etc. is applied, it can be received by a wide area of the pin end. Because the wedge member 40 is left fitted in the recess 32, the diametrically enlarged part of the pin end will not become dull even if such impact load is applied repetitively. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pin type cage provided in a roller bearing.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a pin type cage is used for a roller bearing which is relatively large and is used under a condition where a large load or an impact load is applied. Roller bearings of this type include cylindrical roller bearings, tapered roller bearings, spherical roller bearings, and the like.
[0003]
As a roller bearing having this pin type cage, for example, there is a roller bearing as disclosed in JP-A-11-230176.
[0004]
The pin-type retainer disclosed in this publication has a configuration including a pair of rings spaced apart in parallel in the axial direction, and a round bar-shaped pin provided at several positions in the circumferential direction of both rings.
[0005]
The pin has a smaller diameter at both ends than the body portion. The small-diameter portion at one end of the pin is “gap-fitted” into the through-hole of the first ring, and the one end surface of the pin is stamped and deformed with a stamping punch or the like to thereby form the outer diameter of the other end of the pin. The portion is plastically deformed radially outward so that the other end of the pin is fixed to the inner peripheral surface of the through hole of the first ring, and is prevented from rotating around one end peripheral surface of the pin by a set screw. Further, the small diameter portion at the other end of the pin is formed as a screw shaft portion by forming a screw groove, and the screw shaft portion is coupled by being screwed into a screw hole of the second ring.
[0006]
[Problems to be solved by the invention]
In the above-mentioned pin type retainer, one end of the pin which has been “clear-fitted” to the inner peripheral surface of the through hole of the first ring is plastically deformed by embossing, so that the pin has an inner peripheral surface of the through hole. Although one end is fixed, the plastically deformed portion at one end of the pin gradually drops by repeatedly receiving an impact load or the like, and the fixed portion between the inner peripheral surface of the through hole and one end of the pin is fixed. There is a concern that there will be gaps in the space.
[0007]
[Means for Solving the Problems]
The pin-type retainer of the present invention includes a pair of rings arranged in the axial direction at a distance from each other, and a round bar-shaped pin provided at several positions in the circumferential direction of the two rings. A through hole into which one end of the pin is inserted is provided at several places in the circumferential direction of the one ring. A mortar-shaped recess is provided at one end of the pin so as to open toward the edge of the one end, and by providing this recess, one end of the pin is made cylindrical. In a state where one end of the pin is inserted into the through hole of the one ring, a wedge member is attached to the concave portion of the pin, and the cylindrical portion of one end of the pin is formed by the wedge action of the wedge member. The diameter is increased and the surface is pressed and fixed to the inner peripheral surface of the through hole of the one ring.
[0008]
In this case, the cylindrical portion at one end of the pin is enlarged in diameter by the wedge action of the wedge member attached to the concave portion of the pin, and is pressed and fixed to the inner peripheral surface of the through hole of the one ring. As a result, the strength of coupling of the pin to the one ring is improved, and the stress when an impact load is applied is distributed over the entire surface of one end of the pin. In addition, since the wedge member is kept mounted in the concave portion of the pin, even if an impact load is repeatedly received, the enlarged portion at one end of the pin does not drop.
[0009]
In addition, slits can be provided along the longitudinal direction of the pin at several positions in the circumferential direction of the cylindrical portion at one end of the pin. In this case, the one end of the pin is easily expanded by the wedge action of the wedge member, and the ring is easily pressed uniformly against the inner peripheral surface of the through hole.
[0010]
Further, by providing a thread groove on each of the inner diameter portion of the concave portion at one end of the pin and the outer diameter surface of the wedge member, the wedge member can be screwed into the concave portion. In this case, the degree of pressing one end of the pin against the inner peripheral surface of the through hole of the one ring can be managed by the screwing torque of the wedge member, which is preferable.
[0011]
Further, a portion straddling the outer opening of the through hole and the outer periphery of the wedge member can be welded or stamped and fixed. The embossing and fixing means that the shape of the through hole and the wedge member is plastically deformed using a tool such as an embossing punch, so that the wedge member does not physically rotate and does not come off. To tell. In this case, the emergence of the wedge member can be eliminated.
[0012]
Further, screw holes may be provided at several places in the circumferential direction of the other ring, and a screw shaft provided at the other end of the pin may be screwed into the screw hole.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 4 show a first embodiment of the present invention. FIG. 1 shows a pin type cage 1. This pin type cage 1 is used for a cylindrical roller bearing 2 as shown in FIG. In FIG. 2, 3 is an inner ring, 4 is an outer ring, and 5 is a cylindrical roller.
[0014]
The pin type retainer 1 includes a pair of rings 10 and 20 which are spaced apart in parallel in the axial direction, and a round bar-shaped pin 30 which is provided at several positions in the circumferential direction of the two rings 10 and 20. .
[0015]
In the first embodiment, the structure of coupling one end of the pin 30 to the first ring 10 is devised, and will be described in detail below.
[0016]
In addition, regarding the coupling structure of the other end of the pin 30 with respect to the second ring 20, the screw shaft 21 provided at the other end of the pin 30 with respect to the screw holes 21 provided at several places in the circumferential direction of the second ring 20. This is done by screwing the part 31 together.
[0017]
First, through holes 11 extending in the axial direction are provided at several places in the circumferential direction of the first ring 10. An outer opening of the through hole 11 is chamfered in a tapered shape.
[0018]
One end of the pin 30 is provided in a state in which a mortar-shaped recess 32 is opened toward the edge. The concave portion 32 has a spherical bottom at the bottom, and a tapered shape in which a region from the middle in the depth direction to the opening end is increased in diameter toward the opening. One end of the pin 30 has a cylindrical shape due to the provision of the concave portion 32, and slits 33 are formed at several places (for example, four places) in the circumferential direction of the cylindrical part along the longitudinal direction of the pin 30. Is provided. By providing the slit 33, the cylindrical portion is formed into a plurality (for example, four) of projections divided in the circumferential direction.
[0019]
The depth of the concave portion 32 of the pin 30 is set smaller than the axial length of the through hole 11 of the first ring 10 in consideration of the shear stress generated between the through hole 11 and the cylindrical roller 5. . As a result, when one end of the pin 30 is inserted into the through hole 11 of the first ring 10, not only the protruding portion at one end of the pin 30 but also the body of the pin 30 enters the through hole 11. Become. The body portion of the pin 30 with respect to the through hole 11 is “clearance fit” so that the pin 30 can be easily inserted into the through hole 11.
[0020]
Then, with one end of the pin 30 inserted into the through hole 11 of the first ring 10 from the inside, the wedge member 40 is press-fitted into the recess 32 of the pin 30 from outside the first ring 10. I have.
[0021]
The outer shape of the wedge member 40 is formed in a conical shape corresponding to the tapered portion of the concave portion 32 of the pin 30, and a tapered chamfer is applied to an end on the large diameter side.
[0022]
That is, when the wedge member 40 is press-fitted into the concave portion 32, the four projecting portions provided at one end of the pin 30 are expanded in diameter by the wedge action of the wedge member 40, so that the first ring 10 is The inner peripheral surface of the hole 11 is pressed and fixed over the entire circumference.
[0023]
By the way, the assembling of the pin type retainer 1 is performed with the cylindrical rollers 5 fitted to the pins 30 one by one when the pins 30 and the first ring 10 are connected. After the wedge member 40 is driven into the pin 30, the first ring 10, the pin 30 and the wedge member are welded by welding a portion straddling the chamfer of the wedge member 40 and the chamfer of the through hole 11 of the first ring 10. The wedge member 40 is securely fixed to prevent the wedge member 40 from coming off and rotating. The reference numeral 50 is attached to the welded portion. However, in place of the welding, it is also possible to prevent the rotation by forming it into an embossed shape.
[0024]
As described above, in the pin-type cage 1 according to the first embodiment, one end of the pin 30 is fixed to the through-hole 11 of the first ring 10 by pressure contact with the surface. As a result, when the impact load is applied, the impact load can be received on the entire surface of one end of the pin 30, and the durability of the pin 30 can be improved. Moreover, since the wedge member 40 is kept mounted in the concave portion 32 of the pin 30, even if an impact load is repeatedly applied, the enlarged portion at one end of the pin 30 does not drop. Therefore, the pressure-fixed state of one end of the pin 30 to the through-hole 11 of the first ring 10 can be maintained for a long time, which can contribute to improvement in reliability.
[0025]
5 to 7 show a second embodiment of the present invention. In the second embodiment, since the mounting form of the wedge member 40 in the first embodiment is changed, only the changed portion will be described in detail.
[0026]
A thread groove 41 is formed in the conical surface of the wedge member 40. A thread groove 34 that is screwed into the thread groove 41 is formed on the tapered surface of the recess 32 of the pin 30.
[0027]
Then, with one end of the pin 30 inserted from the inside into the through hole 11 of the first ring 10, the wedge member 40 is screwed into the thread groove 34 of the concave portion 32 of the pin 30, thereby forming a wedge. The projecting portion at one end of the pin 30 is enlarged in diameter by the wedge action of the member 40 so as to be pressed against the inner peripheral surface of the through hole 11 of the first ring 10.
[0028]
As shown in FIG. 7, a concave portion 42 for engaging with a screwdriver (not shown) used when screwing the pin 30 into the concave portion 32 is provided on the chamfer-side end surface of the wedge member 40. I have. The concave portion 42 is formed in a shape conforming to the case where the screwdriver is a hexagon wrench in the drawing. However, although not shown, when a flathead screwdriver is used as a screwdriver, the shape of the concave portion 42 is a shape that matches the flathead screwdriver.
[0029]
In the second embodiment, one end of the pin 30 is fixed to the inner peripheral surface of the first ring 10 through-hole 11 by pressing the wedge member 40 into the recess 32 in the same manner as in the first embodiment. As a result, the strength of coupling of the pin 30 to the first ring 10 is improved, and the durability of the pin 30 is improved. In addition, the degree of pressing one end of the pin 30 against the inner peripheral surface of the through-hole 11 of the first ring 10 can be accurately controlled by the screwing torque of the wedge member 40, which is preferable.
[0030]
8 to 10 show a third embodiment of the present invention. In the third embodiment, since the shape of the wedge member 40 of the second embodiment is changed, only the changed portion will be described.
[0031]
The wedge member 40 is provided with a flange 43 that protrudes radially outward at the large-diameter end. The outer peripheral surface of the flange 43 is tapered to reduce the diameter toward the opening side of the concave portion 42. The maximum outer diameter portion of the flange 43 is set slightly smaller than the inner diameter size of the through hole 11 of the first ring 10.
[0032]
When such a wedge member 40 is used, a margin for welding to a portion straddling the chamfer of the flange 43 and the chamfer of the through hole 11 can be reduced. Further, the pin 30 can be fixed without welding.
[0033]
Note that the present invention is not limited to only the above embodiment, and various modifications and applications can be considered.
[0034]
(1) In each of the above-described embodiments, the pin 30 may be left cylindrical without providing the slit 33 at one end. In this case, it is preferable to appropriately set the thickness of the cylindrical portion so that the diameter of the cylindrical portion of the pin 30 is easily increased by the wedge action of the wedge member 40.
[0035]
(2) In each of the above embodiments, the fitting of the body portion at one end of the pin 30 to the through-hole 11 may be “tight fitting”. In this case, although it is necessary to press-fit the pin 30 into the through-hole 11 of the first ring 10, when receiving an impact load, the body of the pin 30 fitted into the through-hole 11 receives the impact load. Part of the pin 30 can be received, and the load resistance of the pin 30 can be further improved.
[0036]
(3) The present invention is applicable not only to the pin type cage 1 used for the cylindrical roller bearing described in each of the above embodiments, but also to the pin type cage used for the tapered roller bearing, the spherical roller bearing, and the like. it can.
[0037]
(4) In each of the above embodiments, the connection structure of the other end of the pin 30 to the second ring 20 may be the same as the connection structure of the one end of the pin 30 to the first ring 10.
[0038]
【The invention's effect】
ADVANTAGE OF THE INVENTION In the pin type | mold cage of this invention, while being able to improve the joining strength of the one end of the pin with respect to one ring, when receiving an impact load, stress will be applied to the local part of the area | region where the pin fits in the through-hole of one ring. Can be dispersed over a wide area without concentrating, thereby contributing to improved pin durability. In addition, even if an impact load is repeatedly received, a state in which one end of the pin is pressed and fixed to the through hole of the one ring can be maintained for a long time, so that reliability can be improved as compared with the conventional example.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a pin type cage according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing an upper half of the pin type cage of FIG. 1. FIG. FIG. 4 is an exploded view showing a pin and a wedge member of the pin type holder of FIG. 1; FIG. 5 is a view corresponding to FIG. 2 in a pin type holder according to a second embodiment of the present invention; FIG. 7 is an exploded view of the pin-type cage of FIG. 5; FIG. 8 is a perspective view showing a pin and a wedge member of the pin-type cage of FIG. 5; FIG. 8 is a pin-type cage according to Embodiment 3 of the present invention; FIG. 9 is an exploded view of the pin-type cage of FIG. 8; FIG. 10 is a perspective view showing a pin and a wedge member of the pin-type cage of FIG. 8;
1 Pin Type Cage 5 Cylindrical Roller 10 1st Ring 11 1st Ring Through Hole 30 Pin 32 Pin Recess 33 Pin Slit 40 Wedge Member

Claims (5)

A pair of rings arranged in the axial direction and a round bar-shaped pin provided at several places in the circumferential direction of both rings,
A through hole into which one end of the pin is inserted is provided at several places in the circumferential direction of the one ring,
A mortar-shaped recess is provided at one end of the pin so as to open toward the edge of the one end, and by providing this recess, one end of the pin is made cylindrical,
In a state where one end of the pin is inserted into the through hole of the one ring, a wedge member is attached to the concave portion of the pin, and the cylindrical portion of one end of the pin is formed by the wedge action of the wedge member. A pin-type retainer whose diameter is enlarged and pressure-fixed by a surface to an inner peripheral surface of a through hole of the one ring. 2. The pin-type retainer according to claim 1, wherein slits are provided at several positions in a circumferential direction of a cylindrical portion at one end of the pin along a longitudinal direction of the pin. 3. A thread groove is provided on each of an inner diameter portion of a concave portion at one end of the pin and an outer diameter surface of the wedge member, and the wedge member is screwed to the concave portion. Pin retainer. The pin-type retainer according to any one of claims 1 to 3, wherein a portion straddling an outer opening of the through hole and an outer periphery of the wedge member is fixed by welding or stamping. The screw hole is provided in several places of the circumference direction of the other ring, and a screw shaft part provided in the other end of the pin is screwed into the screw hole. Pin retainer.

Images