JP2012177428A - Pin type retainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pin type retainer which has a structure not using plastic deformation or welding in connection between an annular side plate and a pin, and which can be easily disassembled and assembled upon maintenance and inspection, which is tolerable for use for a long period of time, and which can facilitate quality management.SOLUTION: The pin type retainer 40 has a plurality of pins 50 which support hollow rollers 30, and first and second annular side plates 60 and 70 which are respectively connected to both end portions of the pins 50, and male thread portions 51 are provided at the both end portions of the pins 50, a plurality of female thread holes 61 which screw with the male thread portions 51 at one side are provided at the first annular side plate 60 at a predetermined interval in a circumferential direction, a plurality of tapered holes 71 are provided at the second annular side plate 70 at a predetermined interval in a circumferential direction, a tapered portion 82 which abuts on the tapered holes 71 further has a nut member 80 provided on an outer periphery face, the male thread portions 51 at the other side are fastened to the nut member 80 through a thorough hole 72 of the second annular side plate 70, thereby the tapered portion 82 presses the tapered holes 71.

Description

  The present invention relates to a pin type cage used for a roller bearing.

  In large roller bearings used in iron making facilities or papermaking machines, pin type cages are widely used as cages. Here, the basic configuration of the pin type cage will be described. The pin type cage is composed of a plurality of round bar-like pins that rotatably support a plurality of rollers, and a plurality of pins arranged at predetermined intervals in the circumferential direction of the raceway. And a pair of annular side plates supported by A central hole is provided in the central portion of the roller in the axial direction, and a pin is disposed through the central hole to support the roller described above. Such a roller is a “hollow roller”. is called.

  In the pin type cage, one end of the pin is screwed to one annular side plate, and the other end of the pin is fixed to the other annular side plate by welding, so that the pin and the pair of annular side plates are Generally connected. However, in such a connection, there is a possibility that the portion to be fixed by welding is fatigued as a result of being used in a load state for a long time. When adopting a structure that avoids this fatigue failure, for example, a press-fitting / welding structure (see, for example, Patent Document 1), there is a possibility that assembly efficiency and the like are reduced.

  Therefore, in order to withstand long-term use and improve assembly, a pin with a predetermined depth is provided on one end face of the pin, and the screw end is expanded by tightening a screw member in this hole. What is fixed to an annular side plate is known (see, for example, Patent Document 2).

  By the way, iron and steel facilities and the like in which large roller bearings are assembled are regularly inspected and inspected, and in this maintenance inspection, the large roller bearings are also disassembled to check whether there is an abnormality in the pin type cage. In the inspection of the pin type cage, there is a case where it is inspected at the component level. At this time, the pin type cage is disassembled for each component and a detailed inspection is performed.

JP 2003-336644 A JP 2008-298134 A

  However, in the pin type cage of Patent Document 2 described above, the pin end portion is expanded by tightening the screw member, and therefore, the pin end portion is plastically deformed. For this reason, the part had to be cut | disconnected in the case of decomposition | disassembly. Similarly, the pin-type cage of the above-mentioned Patent Document 1 also has to cut the weld-fixed part when disassembling.

  In addition, when the connection between the annular side plate and the pin is performed by welding as in the conventional pin type cage including the one of the above-mentioned Patent Document 1, when the rotational speed of the large roller bearing changes, the rolling element and the pin A load may be applied to the pin due to contact or vibration, and the weld may be peeled off. For this reason, peeling of the welded portion may lead to breakage of the pin type cage or the roller bearing, making quality control of the pin type cage difficult.

  The present invention has been made in view of the above-described circumstances, and its purpose is to make the connection between the annular side plate and the pin a structure that does not use plastic deformation or welding, and can be easily disassembled and assembled during maintenance inspection. An object of the present invention is to provide a pin type holder that can be used and can withstand long-time use, and can facilitate quality control.

The above object of the present invention can be achieved by the following constitution.
(1) A plurality of pins that rotatably support a plurality of hollow rollers of a roller bearing, and first and second pins that are respectively connected to and opposed to both ends of the pins and that support each of the pins at predetermined intervals in the circumferential direction. Each of the pins has a male threaded portion at both ends, and the first annular side plate has a female threaded hole that engages with one of the male threaded portions of the pin. The second annular side plate is provided with a plurality of taper holes with a predetermined interval in the circumferential direction, and the second annular side plate has a taper hole concentrically with the taper hole. A through hole is provided so as to have a step portion therebetween, and a tapered portion that comes into contact with the tapered hole of the second annular side plate is provided on the outer peripheral surface, and is screwed with the other of the male screw portions of the pin. Nut with female screw hole And the other of the male screw portions of the pin is screwed into the female screw hole of the nut member through the through hole of the second annular side plate and tightened, whereby the tapered portion of the nut member becomes the second annular side plate. A pin-type cage that presses the taper hole of the pin.
(2) A plurality of pins that rotatably support a plurality of hollow rollers of a roller bearing, and first and second pins that are respectively connected to and opposed to both ends of the pins and that support the pins at predetermined intervals in the circumferential direction. An annular side plate, wherein each pin has a male threaded portion at both ends, and both the first and second annular side plates have a taper that increases in diameter outward in the axial direction. A plurality of holes are provided at a predetermined interval in the circumferential direction, and through holes are provided so as to have step portions between the tapered holes and concentric positions with the tapered holes, respectively, and the tapered holes of the first or second annular side plate are provided. And a nut member provided with a female screw hole to be screwed with one or the other of the male screw portions of the pin, and the male screw portion of the pin includes first and second circles. Of the through hole in the annular side plate By tightened screwed into the female screw hole of the nut member through respectively, the pin type cage, wherein the tapered portion of the nut member presses the first and second annular side plates of the tapered hole, respectively.

  According to claim 1 of the present invention, the pin has male threaded portions at both ends, and one of the male threaded portions of the pin is screwed into the female threaded hole of the first annular side plate for connection with the first annular side plate. Then, the connection with the second annular side plate is realized by screwing the other male screw portion of the pin with the female screw hole of the nut member through the through hole of the second annular side plate. At this time, the other of the male screw portions is tightened by the nut member, and the tapered hole of the second annular side plate and the tapered portion of the nut member abut. For this reason, by tightening the nut member, the end face of the pin and the side surface of the annular side plate come into contact, and the tapered portion of the nut member presses the tapered hole of the second annular side plate to make surface contact. The pin and the second annular side plate can be firmly connected.

  According to claim 2 of the present invention, the pin has male screw portions at both ends, and the first and second annular side plates are connected to the first and second male screw portions at both ends of the pin. It implement | achieves by screwing together with the internal thread hole of a nut member through the through-hole of an annular | circular shaped side plate, respectively. At this time, these male screw portions are fastened to the nut member, and the tapered holes of the first and second annular side plates respectively contact the tapered portions of the nut member. For this reason, by tightening the nut member, the tapered portion of the nut member presses each of the tapered holes of the first and second annular side plates to come into surface contact with each other, so that the pin and the first and second annular side plates are in contact with each other. Can be firmly connected to each other.

  Therefore, according to the first and second aspects of the present invention, since it is a structure using a screw connection rather than a structure using plastic deformation or welding, it can be easily assembled and disassembled during maintenance inspection. . In addition, since there is no peeling of the welded part and there is no plastically deformed part, quality control for each part can be facilitated.

  Here, in the structure using conventional welding, there is an advantage of preventing the male threaded portion of the pin from being loosened due to the rotation of the hollow roller, and the male threaded portion of the pin is tightened by the nut member also in the present invention. Thus, the tapered portion of the nut member and the tapered hole of the second annular side plate are brought into surface contact and are fastened in a wedged state. For this reason, it is possible to reliably prevent the pins from rotating around and to withstand long-time use.

It is principal part sectional drawing explaining the roller bearing provided with 1st Embodiment of the pin type holder | retainer which concerns on this invention. It is principal part sectional drawing explaining the roller bearing provided with 2nd Embodiment of the pin type holder | retainer which concerns on this invention.

  Hereinafter, each embodiment of the pin type retainer according to the present invention will be described in detail based on the drawings.

(First embodiment)
First, with reference to FIG. 1, 1st Embodiment of the pin type holder | retainer based on this invention is described.

  As shown in FIG. 1, the roller bearing 1 of the present embodiment is a single-row tapered roller bearing, and includes an inner ring 10 having a raceway surface 11 on an outer peripheral surface, an outer ring 20 having a raceway surface 21 on an inner peripheral surface, and a raceway. A plurality of hollow rollers 30 arranged between the surfaces 11 and 21 so as to be freely rollable, and a pin type retainer 40 that holds the plurality of hollow rollers 30 at a predetermined interval. Further, a small collar part 12 and a large collar part 13 are formed at the axial end of the inner ring 10 respectively.

  The pin type retainer 40 is connected to a plurality of pins 50 that rotatably support the plurality of hollow rollers 30 and both ends of the pins 50 so as to face each other, and supports the pins 50 at predetermined intervals in the circumferential direction. A first annular side plate 60 and a second annular side plate 70; and a nut member 80 for attaching the second annular side plate 70 to the pin 50. A center hole 31 is formed on the axial center line of the hollow roller 30, and the hollow roller 30 is supported by the pin 50 by inserting the pin 50 through the center hole 31.

  The pin 50 has male screw parts 51 at both ends thereof. The pin 50 is connected to the first annular side plate 60 by the male screw portion 51 on one side (right side in FIG. 1), and is connected to the second annular side plate 70 by the male screw portion 51 on the other side (left side in FIG. 1). .

  The first annular side plate 60 is provided with a plurality of female screw holes 61 at predetermined intervals in the circumferential direction in which the male screw part 51 on one side of the pin 50 is screwed. In the present embodiment, the female screw hole 61 is formed so as to penetrate the first annular side plate 60. However, the male screw portion 51 of the pin 50 may be fastened, and may not be penetrated. Good.

  The second annular side plate 70 is provided with tapered holes 71 whose diameter is increased outward in the axial direction at predetermined intervals in the circumferential direction. The second annular side plate 70 is provided with a through hole 72 so as to have a stepped portion 73 concentric with the tapered hole 71 and between the tapered hole 71. Further, at the time of assembly, the male screw portion 51 on the other side of the pin 50 is disposed in the tapered hole 71 through the through hole 72 of the second annular side plate 70.

  The nut member 80 is formed in a conical shape, and is formed so that the female screw hole 81 passes through the axial center line. Moreover, it is preferable to provide a recess (minus type, plus type, etc.) for tightening the nut member 80 with a tool on the outer end face of the nut member 80. Further, a tapered portion 82 that contacts the tapered hole 71 of the second annular side plate 70 is formed on the outer peripheral surface of the nut member 80. Then, the male screw portion 51 on the other side of the pin 50 is screwed into the female screw hole 81 of the nut member 80 and tightened, whereby the taper portion 82 of the nut member 80 presses the taper hole 71 of the second annular side plate 70. To do.

  Next, a method for assembling the pin type retainer 40 of this embodiment will be described. First, the pin 50 is passed through the center hole 31 of the hollow roller 30. Next, the male screw portion 51 on one side of the pin 50 is screwed into the female screw hole 61 of the first annular side plate 60 and tightened. Next, the male screw portion 51 on the other side of the pin 50 is passed through the through hole 72 and the tapered hole 71 of the second annular side plate 70, and the female screw hole 81 of the nut member 80 is screwed into the male screw portion 51 on the other side of the pin 50. Tighten together. In addition, what is necessary is just to reverse the procedure of the said assembly method as a decomposition | disassembly method.

  By the way, in this type of roller bearing, since the hollow roller skews on the raceway surface of the inner ring, the axial distance between the first and second annular side plates is slightly larger than the axial length of the hollow roller. Although it is necessary to adjust the axial distance between the first and second annular side plates so that the hollow rollers do not interfere with the first and second annular side plates, in this embodiment, the axial direction of the pin 50 Since the length is slightly larger than the axial length of the hollow roller 30, it is not necessary to adjust the axial distance between the first and second annular side plates 60 and 70 during assembly, facilitating assembly. be able to.

  As described above, according to the pin type retainer 40 of the present embodiment, the male thread portion 51 on one side of the pin 50 is screwed into the female thread hole 61 of the first annular side plate 60, whereby the first circle The male threaded portion 51 on the other side of the pin 50 connected to the annular side plate 60 is screwed into the female threaded hole 81 of the nut member 80 through the through-hole 72 of the second annular side plate 70, so that the second annular side plate 70 When the male screw portion 51 on the other side is connected and tightened to the nut member 80, the taper portion 82 of the nut member 80 comes into contact with the taper hole 71 of the second annular side plate 70 and presses the taper hole 71. 50 and the second annular side plate 70 can be firmly connected. Thereby, it is not a structure using plastic deformation or welding, but can be easily assembled and disassembled during maintenance inspection. In addition, since there is no peeling of the welded part and there is no plastically deformed part, quality control for each part can be facilitated.

  Here, in the structure using conventional welding, there is an advantage of preventing the male threaded portion of the pin from loosening due to the rotation of the hollow roller and the male threaded portion 51 on the other side of the pin 50 also in this embodiment. When the nut member 80 is tightened, the tapered portion 82 of the nut member 80 and the tapered hole 71 of the second annular side plate 70 are brought into surface contact and fastened in a wedged state. For this reason, it can prevent reliably that the pin 50 carries around and can also endure use for a long time.

(Second Embodiment)
Next, a second embodiment of the pin type retainer according to the present invention will be described with reference to FIG. Note that the same or equivalent parts as those in the first embodiment are given the same or equivalent reference numerals in the drawings, and the description thereof is omitted or simplified.

  In the present embodiment, as shown in FIG. 2, the first annular side plate 60 has a tapered hole 91 whose diameter increases toward the outer side in the axial direction, similarly to the second annular side plate 70 of the first embodiment. A plurality are provided at predetermined intervals in the circumferential direction. Further, the first annular side plate 60 is provided with through holes 92 so as to have a stepped portion 93 concentric with the tapered hole 91 and between the tapered hole 91. Further, at the time of assembly, the male thread portion 51 on one side of the pin 50 is disposed in the tapered hole 91 through the through hole 92 of the first annular side plate 60. Then, the male threaded portion 51 on one side of the pin 50 is screwed into the female threaded hole 81 of the nut member 80 and tightened, whereby the tapered portion 82 of the nut member 80 presses the tapered hole 91 of the first annular side plate 60. To do.

  Next, a method for assembling the pin type retainer 40 of this embodiment will be described. First, the pin 50 is passed through the center hole 31 of the hollow roller 30. Next, the male screw portion 51 on one side of the pin 50 is passed through the through hole 92 and the tapered hole 91 of the first annular side plate 60, and the female screw hole 81 of the nut member 80 is screwed into the male screw portion 51 on one side of the pin 50. Tighten together. Next, the male screw portion 51 on the other side of the pin 50 is passed through the through hole 72 and the tapered hole 71 of the second annular side plate 70, and the female screw hole 81 of the nut member 80 is screwed into the male screw portion 51 on the other side of the pin 50. Tighten together. In addition, what is necessary is just to reverse the procedure of the said assembly method as a decomposition | disassembly method. Further, the assembly order of the first and second annular side plates 60 and 70 to the pin 50 may be reversed.

As described above, according to the pin type retainer 40 of the present embodiment, the male screw portion 51 on one side of the pin 50 is screwed with the female screw hole 81 of the nut member 80 through the through hole 92 of the first annular side plate 60. By joining, the male threaded portion 51 on the other side of the pin 50 is connected to the first annular side plate 60 and screwed into the female threaded hole 81 of the nut member 80 through the through hole 72 of the second annular side plate 70. The second annular side plates 70 are connected to each other, and the male screw portions 51 are fastened to the nut members 80, whereby the tapered portions 82 of the nut members 80 are tapered holes 91, 71 of the first and second annular side plates 60, 70. And the taper holes 91 and 71 are pressed, so that the pin 50 and the first and second annular side plates 60 and 70 can be firmly connected. Thereby, it is not a structure using plastic deformation or welding, but can be easily assembled and disassembled during maintenance inspection. In addition, since there is no peeling of the welded part and there is no plastically deformed part, quality control for each part can be facilitated.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the above embodiment, the case where the present invention is applied to a single-row tapered roller bearing is illustrated, but the present invention is not limited to this, and the present invention may be applied to a multi-row tapered roller bearing.
Moreover, in the said embodiment, although the case where this invention was applied to a tapered roller bearing was illustrated, it is not limited to this, You may apply this invention to a cylindrical roller bearing.
The materials and shapes of the pin 50, the first and second annular side plates 60, 70, and the nut member 80 are preferably selected and designed as appropriate in consideration of the weight balance between the left and right annular portions. .

DESCRIPTION OF SYMBOLS 1 Roller bearing 10 Inner ring 11 Race surface 20 Outer ring 21 Race surface 30 Hollow roller 31 Center hole 40 Pin type retainer 50 Pin 51 Male thread part 60 First annular side plate 61 Female screw hole 70 Second annular side plate 71 Tapered hole 72 Through hole 73 Stepped portion 80 Nut member 81 Female screw hole 82 Tapered portion 91 Tapered hole 92 Through hole

Claims (2)

A plurality of pins that rotatably support a plurality of hollow rollers of a roller bearing, and first and second circles that are connected to both ends of the pins so as to be opposed to each other and support the pins at predetermined intervals in the circumferential direction. In a pin type cage comprising an annular side plate,
Each of the pins has male threaded portions at both ends,
The first annular side plate is provided with a plurality of female screw holes that are threadedly engaged with one of the male screw portions of the pin at a predetermined interval in the circumferential direction.
The second annular side plate is provided with a plurality of tapered holes that expand in the axial direction outward at a predetermined interval in the circumferential direction, and a step portion between the tapered holes and the tapered hole at a concentric position. Each having a through hole so as to have
A taper portion that comes into contact with the taper hole of the second annular side plate is provided on the outer peripheral surface, and further includes a nut member provided with a female screw hole that is screwed with the other of the male screw portions of the pin;
The other of the male threaded portions of the pin is screwed into the female threaded hole of the nut member through the through hole of the second annular side plate and tightened, whereby the tapered portion of the nut member is A pin type cage that presses the tapered hole of the two annular side plates. A plurality of pins that rotatably support a plurality of hollow rollers of a roller bearing, and first and second circles that are connected to both ends of the pins so as to be opposed to each other and support the pins at predetermined intervals in the circumferential direction. In a pin type cage comprising an annular side plate,
Each of the pins has male threaded portions at both ends,
Both the first and second annular side plates are provided with a plurality of tapered holes that expand in the axial direction outward at a predetermined interval in the circumferential direction, and the tapered holes are concentric with the tapered holes. Through holes are provided so as to have a stepped portion between
A nut member in which a tapered portion that contacts the tapered hole of the first or second annular side plate is provided on an outer peripheral surface, and a female screw hole that is screwed with one or the other of the male screw portions of the pin is provided. Further comprising
When the male threaded portion of the pin is screwed into the female threaded hole of the nut member through each of the through holes of the first and second annular side plates, the tapered portion of the nut member is tightened. A pin type retainer for pressing the tapered holes of the first and second annular side plates, respectively.

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