JP2011112120A - Bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing unit having improved durability by securing the accuracy of teeth during machining while reducing a manufacturing time to reduce the manufacturing cost and suppressing the accuracy degradation of the teeth due to the non-uniformity and machining or thermal strain of a material to prevent noises and rotating irregularity during operation. <P>SOLUTION: The bearing unit 100 includes a cylindrical gear 110 having the teeth 111 meshing with another gear 150 and a flange 132 forming a bearing, on the inner and outer peripheries, respectively. The cylindrical gear 110 is formed with a plurality of gear modules 120, 130, 140 axially stacked in a plurality of layers and fixed to one another. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bearing unit composed of a cylindrical gear having a tooth that engages with other gears on the inner periphery or outer periphery and a flange that forms a bearing, and particularly to a turning unit of a large machine such as a construction machine or a crane. It relates to a suitable bearing unit.

2. Description of the Related Art Conventionally, a bearing unit including a cylindrical gear having a tooth that engages with another gear and a flange that forms a bearing on an inner periphery or an outer periphery is well known.
A known bearing unit is manufactured from a single material by machining with a machine tool such as a gear cutter (see Patent Document 1).

Japanese Patent Laying-Open No. 2005-61574 (5th page, FIG. 2)

The known bearing unit has a large size and a long axial length of the tooth, so that it is difficult to ensure the accuracy of the tooth at the time of processing, and the manufacturing time becomes long and the manufacturing cost becomes very high. there were.
In addition, the accuracy of the teeth is low due to the effects of material non-uniformity, distortion due to processing, or distortion in post-treatment such as heat treatment. There was a possibility that there was a problem in durability.

  The present invention solves the problems of the prior art as described above, that is, the object of the present invention is to ensure the accuracy of teeth during processing, shorten the production time, reduce the production cost, It is intended to provide a bearing unit that suppresses a reduction in tooth accuracy due to non-uniformity, processing distortion, thermal distortion, and the like, prevents noise and rotation unevenness during operation, and has improved durability.

  The invention according to claim 1 is a bearing unit including a cylindrical gear having a tooth that engages with another gear and a flange that forms a bearing on the inner periphery or the outer periphery, respectively. The above-mentioned problem is solved by forming a plurality of gear modules having teeth meshing with the gears in a stacking manner in a plurality of layers in the axial direction.

  In the invention according to claim 2, in addition to the configuration of the bearing unit described in claim 1, the plurality of gear modules are divided into a plurality of circumferential directions in all layers, and the cylindrical gear is The above-described problems are further solved by forming the plurality of gear modules by shifting the phases of the division positions and overlapping and fixing them in the axial direction.

  In the invention according to claim 3, in addition to the configuration of the bearing unit according to claim 1 or 2, the cylindrical gear is fixed by being overlapped in the axial direction by shifting phases of teeth of a plurality of gear modules. Thus, the above-described problems are further solved.

  According to a fourth aspect of the present invention, in addition to the configuration of the bearing unit according to any one of the first to third aspects, the flange forming the bearing is at least an axial direction of the plurality of gear modules. This problem is further solved by being formed on the outer periphery or the inner periphery of the single-layer gear module.

  In the invention according to claim 5, in addition to the structure of the bearing unit according to any one of claims 1 to 4, the teeth of the gear module are at least adjacent to the teeth of another gear module. By having the concave groove at the end edge, the above-mentioned problem is further solved.

  In the invention according to claim 6, in addition to the structure of the bearing unit according to any one of claims 1 to 5, the gear module is formed of a general gear material and subjected to heat treatment. Therefore, the above-described problem is further solved.

  In the invention according to claim 7, in addition to the structure of the bearing unit according to any one of claims 1 to 5, the gear module is formed of a wear-resistant steel plate. The problem is further solved.

  The bearing unit according to the first aspect of the present invention is a bearing unit comprising a cylindrical gear having a tooth that engages with another gear and a flange that forms a bearing on the inner periphery or the outer periphery, and the cylindrical gear is disposed on the inner periphery or the outer periphery. By forming a plurality of gear modules having teeth meshing with other gears in an axial direction and overlapping a plurality of layers, the axial length of the teeth of each gear module is shortened. Sometimes it is possible to ensure the accuracy of the teeth, shorten the production time, and reduce the production cost.

  In addition, since it is possible to replace each individual gear module, even if a part of the bearing unit is damaged or defective, it is possible to replace and repair only the damaged or defective gear module. Maintenance costs can be reduced.

  In addition, by reducing the individual gear module and reducing the thickness, the reduction in tooth accuracy due to material non-uniformity, processing strain, thermal strain, etc. is suppressed, preventing noise and uneven rotation during operation, Durability can be improved.

  In addition to the effect of the bearing unit according to the first aspect, the bearing unit according to the second aspect includes a plurality of gear modules divided into a plurality of circumferential layers in all layers, and a plurality of cylindrical gears. Since the gear module module is formed by shifting the phase of the division position and fixing it in the axial direction, there is no need to use a circumferential gear module or a fixing circumferential member. Can be reduced, and the dividing points in the circumferential direction are dispersed. Further, noise during driving and uneven rotation can be prevented, and durability can be improved.

  In addition to the effect of the bearing unit according to the first or second aspect, the cylindrical gear is configured such that the cylindrical gears are stacked in the axial direction while shifting the phases of the teeth of the plurality of gear modules. By being formed in a fixed manner, meshing with other gears during operation becomes smooth, noise during operation and uneven rotation can be prevented, and durability can be improved.

  The bearing unit according to a fourth aspect of the present invention is the bearing unit according to any one of the first to third aspects, in addition to the effect of the bearing unit according to any one of the first to third aspects. By forming the gear module of one layer of the outer periphery or the inner periphery, it is only necessary to secure the necessary thickness of the flange that forms the bearing, and the overall size is reduced and the number of processing points is reduced. Production time can be shortened and production costs can be reduced.

  In addition to the effect of the bearing unit according to any one of claims 1 to 4, the bearing unit of the invention according to claim 5 is a side where the teeth of the gear module are adjacent to at least the teeth of another gear module. By having a concave groove at the edge of the gear, it is possible to provide a space for holding lubricating oil in the middle of the gear in the axial direction, which further facilitates meshing with other gears during operation. Noise and rotation unevenness can be prevented, and durability can be improved.

  The bearing unit according to the sixth aspect of the present invention is the one in which the gear module is formed of a general gear material and subjected to heat treatment, in addition to the effect exhibited by the bearing unit according to any one of the first to fifth aspects. As a result, the manufacturing time can be shortened, the manufacturing cost can be reduced, and the noise and uneven rotation during operation can be prevented without lowering the durability and wear resistance.

  In addition to the effect of the bearing unit according to any one of claims 1 to 5, the gear module is formed of a wear-resistant steel plate. It is easy to process and does not require heat treatment. Further, the manufacturing time can be shortened, the manufacturing cost can be reduced, and noise and uneven rotation during operation can be prevented.

The perspective view of the bearing unit of one Example of this invention. Sectional drawing of the bearing unit of one Example of this invention. The partial cross section explanatory drawing of the bearing unit of one Example of this invention. The enlarged view of the tooth | gear of the bearing unit of one Example of this invention. Sectional drawing of the tooth | gear joint part of the bearing unit of one Example of this invention. The perspective view of the bearing unit of the other Example of this invention. Sectional drawing of the bearing unit of 2nd Example of this invention.

  The present invention provides a bearing unit comprising a cylindrical gear having a tooth that engages with another gear and a flange that forms a bearing on the inner periphery or outer periphery, and the cylindrical gear has teeth that engage with another gear on the inner periphery or outer periphery. A plurality of gear modules are axially stacked and fixed to a plurality of layers to ensure the accuracy of teeth during processing, reduce the manufacturing time, reduce the manufacturing cost, and reduce the use of materials. Any specific embodiment may be used as long as the deterioration of tooth accuracy due to uniformity, processing strain, thermal strain, etc. is suppressed, noise during operation and uneven rotation are prevented, and durability is improved. It doesn't matter if it exists.

That is, the number of gear modules of the bearing unit of the present invention is any number as long as each gear module can ensure the accuracy of teeth during processing, shorten the manufacturing time, and reduce the manufacturing cost. Also good.
The plurality of gear modules may be fixed with bolts, nuts, or the like, or may be fixed by any method.

Below, the bearing unit which is one Example of this invention is demonstrated based on drawing.
As shown in FIGS. 1 to 3, a bearing unit 100 according to an embodiment of the present invention has teeth 111 that mesh with another gear 150 on the inner peripheral side, and a flange 132 that forms a bearing on the outer peripheral side. It consists of a cylindrical gear 110.

  The cylindrical gear 110 is divided into a plurality of gear modules 120, 130, and 140 in the axial direction (tooth width direction) and the circumferential direction, and an upper gear module 120 that forms an upper layer, and a center that forms a central layer. The gear module 130 and the lower gear module 140 forming the lower layer are shifted in phase in the circumferential division position, and bolts 123, 133, 143 provided in the respective gear modules 120, 130, 140 are bolts ( (Not shown) is inserted and fixed integrally.

  A flange 132 having a larger diameter than the other gear modules 120 and 140 is provided on the outer peripheral side of the central gear module 130, and the thrust bearing 101 contacts the upper and lower sides of the flange 132 and the radial bearing 102 contacts the outer peripheral side. This forms a bearing.

  4 and 5, the upper edge of each of the teeth 131 of the central gear module 130, the teeth 141 of the lower gear module 140, and the teeth 121 of the upper gear module 120, the central gear module Recessed grooves 124, 134, and 144 are provided at the lower edges of the 130 teeth 131, respectively.

  When the upper gear module 120, the central gear module 130, and the lower gear module 140 are overlapped and fixed, a space is formed by the concave grooves 124, 134, 144 at the boundary portions of the edges of the respective teeth 121, 131, 141. It is comprised and lubricating oil is hold | maintained in this space.

According to the bearing unit 100 configured as described above, the teeth 121, 131, and 141 of the gear modules 120, 130, and 140 can be machined by a general-purpose machine tool. It is possible to make the thickness less affected by distortion or the like.
Moreover, it becomes possible to make each gear module 120,130,140 into wear-resistant steel plates, such as HARDOX (trademark), and it becomes possible to abbreviate | omit the heat processing after machining.

  This makes it possible to ensure the accuracy of the teeth 111 during processing, shorten the manufacturing time, reduce the manufacturing cost, and suppress the decrease in the accuracy of the teeth 111, thereby reducing noise and rotation during operation. Unevenness is prevented, wear and damage are suppressed, and durability is improved.

  In addition, since each gear module 120, 130, 140 can be replaced, even if a part of the bearing unit is damaged or defective, only the damaged or defective gear module 120, 130, 140 is replaced. Since it can be repaired, the maintenance cost can be reduced.

  In addition, the space formed by the concave grooves 124, 134, and 144 functions as a space that holds the lubricating oil in the axially intermediate portion of the entire tooth 111, so that the lubricating oil can be supplied smoothly, and further operation can be performed. Noise at the time is prevented, wear and damage are suppressed, and durability is improved.

  Further, the teeth 121, 131, 141 of the gear modules 120, 130, 140 may be shifted in phase, and by engaging the gears 150 of the corresponding tooth type, the meshing start point of the teeth 121, 131, 141 is determined. It is possible to disperse, and the meshing with the other gear 150 during operation becomes smooth, noise during operation and rotation unevenness are prevented, wear and damage are suppressed, and durability is improved.

  As shown in FIGS. 6 and 7, the bearing unit 200 according to another embodiment of the present invention has teeth 211 that mesh with other gears on the outer peripheral side, and a flange 232 that forms a bearing on the inner peripheral side. It consists of a cylindrical gear 210.

  Similar to the previous embodiment, the cylindrical gear 210 is divided into a plurality of gear modules 120, 130, 140 in the axial direction (tooth width direction) and the circumferential direction, and the upper gear module 220, the central gear module 230, and The lower gear module 240 is fixed by inserting bolts (not shown) through bolt holes 223, 233, and 243 provided in the gear modules 220, 230, and 240 while shifting the phase of the circumferential division positions. The inner peripheral side of the central gear module 230 is provided with a flange 232 having a smaller diameter than the other gear modules 220 and 240, and a thrust bearing is in contact with the upper and lower sides of the flange 232, and a radial bearing is in contact with the inner peripheral side. This forms a bearing.

  As described above, according to the present invention, the accuracy of teeth can be ensured during processing, the manufacturing time can be shortened, the manufacturing cost can be reduced, and material non-uniformity, processing distortion, heat The reduction in teeth accuracy due to distortion or the like is suppressed, noise and rotation unevenness during operation can be prevented, and durability can be improved.

  In the above embodiment, the gear module has three layers in the axial direction, and the center gear module is provided with a flange for forming a bearing. However, the gear module may have two layers or four or more layers to form a bearing. The flange to be formed may be provided in the gear module of any layer including the gear module of the uppermost layer and the lowermost layer.

Further, the number of divisions in the circumferential direction of the gear module may be divided into any number as long as it can be divided into sizes that allow easy processing, and may be the same number of divisions or different division numbers in all layers.
Further, the gear module of any layer may be circumferential without being divided in the circumferential direction, and a fixing circumferential ring layer having no teeth may be provided.

DESCRIPTION OF SYMBOLS 100, 200 ... Bearing unit 101 ... Thrust bearing 102 ... Radial bearing 110, 210 ... Cylindrical gear 120, 220 ... Upper gear module 121, 221 ... Tooth 123, 222 ... Bolt holes 130, 230 ... central gear modules 131, 231 ... teeth 132, 232 ... flange 133 ... bolt holes 134 ... concave grooves 140, 240 ... lower gear modules 141, 241 .... Teeth 143 ... Bolt hole 144 ... Concave groove 150 ... Gear

Claims (7)

In a bearing unit consisting of a cylindrical gear having a flange that forms a bearing and a tooth that meshes with another gear on the inner periphery or the outer periphery,
A bearing unit, wherein the cylindrical gear is formed by fixing a plurality of gear modules having teeth meshing with other gears on an inner periphery or an outer periphery so as to overlap each other in a plurality of layers in an axial direction. The plurality of gear modules are divided into a plurality of circumferential directions in all layers,
2. The bearing unit according to claim 1, wherein the cylindrical gear is formed so as to be overlapped and fixed in an axial direction while shifting a phase of a division position of the plurality of gear modules.   3. The bearing unit according to claim 1, wherein the cylindrical gear is formed by being axially overlapped and fixed while shifting the phase of teeth of a plurality of gear modules. 4.   4. The flange according to claim 1, wherein a flange forming the bearing is formed on an outer periphery or an inner periphery of at least one axial gear module of the plurality of gear modules. Crab bearing unit.   The bearing unit according to any one of claims 1 to 4, wherein the teeth of the gear module have a concave groove portion at an end edge thereof adjacent to at least a tooth of another gear module.   The bearing unit according to any one of claims 1 to 5, wherein the gear module is made of a general gear material and heat-treated.   The bearing unit according to any one of claims 1 to 5, wherein the gear module is formed of a wear-resistant steel plate.

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