JP5340898B2 - Bearing unit - Google Patents

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. A plurality of gear modules having teeth meshing with the gears are formed by being overlapped and fixed in a plurality of layers in the axial direction, and the cylindrical gears are fixed by being overlapped in the axial direction by shifting the phases of the teeth of the plurality of gear modules. And the one or more gear modules are arranged in order in the axial direction, the one end side gear module, the central gear module, and the other end side gear module, and the one end side gear module, the central gear module, and the other end The side gear module is formed with the same thickness in the axial direction, and the flange forming the bearing is By being formed by projecting radially from the serial central gear module end side gear module and the other side gear module periphery or inner periphery of, it is to solve the above problems.

  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 described in claim 1 or 2, the teeth of the gear module are at least at the edge adjacent to the teeth of the other gear module. A section of the space formed by the concave groove portion as viewed from a direction orthogonal to the axial direction has a concave groove portion extending along the tooth profile, and extends from the center of the space toward the tooth surface. Therefore, the said subject is further solved by forming in the shape which narrows gradually in an axial direction.

  In the invention according to claim 4, in addition to the structure of the bearing unit according to any one of claims 1 to 3, 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 5, in addition to the structure of the bearing unit according to any one of claims 1 to 3, the gear module is formed of a wear-resistant steel plate, The problem is further solved.

  According to the bearing unit of the first aspect of the present invention, in the bearing unit comprising the cylindrical gear having the teeth that mesh with the other gears on the inner periphery or the outer periphery and the flange that forms the bearing, the cylindrical gear has the inner periphery or the outer periphery. A plurality of gear modules having teeth meshing with other gears on the outer periphery are formed by being overlapped and fixed in a plurality of layers in the axial direction, and the cylindrical gears are overlapped in the axial direction by shifting the phases of the teeth of the plurality of gear modules. The one end side gear module, the central gear module, and the other end side gear module, which are fixedly formed and the plurality of gear modules are sequentially arranged in the axial direction, have the one end side gear module, the central gear module, and the other end The side gear module is formed with the same thickness in the axial direction, and the flange forming the bearing is By forming the outer periphery or inner periphery of the central gear module in a radial direction from the one end side gear module and the other end side gear module, the axial length of the teeth of each gear module is shortened, It is possible to ensure the accuracy of the teeth at the time of processing, reduce the manufacturing time, and reduce the manufacturing 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.
Furthermore, meshing with other gears during operation becomes smooth, and further noise and rotation unevenness during operation can be prevented and durability can be improved.
Further, it is only necessary to secure the required thickness of the flange forming the bearing, and the entire size is reduced and the number of machining points is reduced, so that the production time can be further reduced and the production cost can be reduced.

  According to the bearing unit of the present invention according to claim 2, in addition to the effect produced by the invention according to claim 1, a plurality of gear modules are divided into a plurality of circumferential directions in all layers, and the cylindrical gear is Since the phase of the division positions of multiple gear modules is shifted and fixed in the axial direction, it is not necessary to use a circumferential gear module or a fixing circumferential member, so it is further manufactured The cost can be reduced, the dividing points in the circumferential direction are dispersed, noise during operation and uneven rotation can be prevented, and durability can be improved.

  According to the bearing unit of the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, the tooth of the gear module is at least an end on the side adjacent to the tooth of another gear module. The cross section of the space formed by the concave groove portion as viewed from the direction orthogonal to the axial direction has a concave groove portion extending along the tooth outline at the edge toward the tooth surface from the center of this space. Therefore, by forming in a shape that gradually narrows in the axial direction, it is possible to provide a space for holding the lubricating oil in the middle portion of the gear in the axial direction, and further meshing with other gears during operation becomes smooth, Noise during operation and rotation unevenness can be prevented, and durability can be improved.

  According to the bearing unit of the invention according to claim 4, in addition to the effect exhibited by the invention according to any one of claims 1 to 3, the gear module is formed of a general gear material and subjected to heat treatment. As a result, the manufacturing time can be shortened, the manufacturing cost can be reduced, and noise during operation and uneven rotation can be prevented without lowering durability and wear resistance.

  According to the bearing unit of the invention according to claim 5, in addition to the effect produced by the invention according to any of claims 1 to 3, the gear module is formed of a wear-resistant steel plate. It is easy to process, does not require heat treatment, further shortens the production time, lowers the production cost, and prevents noise and uneven rotation during operation.

The perspective view of the bearing unit of 1st Example of this invention. Sectional drawing of the bearing unit of 1st Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Partial cross-sectional explanatory drawing of the bearing unit of 1st Example of this invention. The enlarged view of the tooth | gear of the bearing unit of 1st Example of this invention. Sectional drawing of the tooth | gear fitting part of the bearing unit of 1st Example of this invention. The perspective view of the bearing unit of 2nd Example of this invention. Sectional drawing of the bearing unit of 2nd Example of this invention.

  The present invention relates to 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 circumference or outer circumference, and the cylindrical gear has teeth that mesh with the other gear on the inner circumference or outer circumference. A plurality of gear modules are formed by being fixed by overlapping a plurality of layers in the axial direction, and a cylindrical gear is formed by fixing a plurality of gear modules by being stacked in the axial direction by shifting the phases of the teeth of the plurality of gear modules. Has one end side gear module, a central gear module, and the other end side gear module, which are sequentially arranged in the axial direction, and the one end side gear module, the central gear module, and the other end side gear module are respectively in the axial direction. The flanges that are formed with the same thickness and that form the bearing have a uniform outer periphery or inner periphery of the central gear module. It is formed by projecting from the side gear module and the other end side gear module in the radial direction, it is possible to ensure the accuracy of the teeth during processing, shorten the manufacturing time, reduce the manufacturing cost, and the material non-uniformity As long as the accuracy of the teeth is prevented from lowering due to processing distortion, thermal strain, etc., noise during operation and uneven rotation are prevented, and durability is improved, the specific embodiment is any. No matter what.

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 1st Example of this invention is demonstrated based on drawing.
As shown in FIGS. 1 to 3, the bearing unit 100 according to the first embodiment of the present invention has teeth 111 that mesh with other gears 150 on the inner peripheral side, and a flange 132 that forms a bearing on the outer peripheral side. It has a cylindrical gear 110 having the same.

  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 the second 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 first embodiment, the cylindrical gear 210 is divided into a plurality of gear modules 120, 130, and 140 in the axial direction (tooth width direction) and the circumferential direction. 230 and the lower gear module 240 insert 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 division positions in the circumferential direction. A flange 232 having a smaller diameter than the other gear modules 220 and 240 is provided on the inner peripheral side of the central gear module 230. A thrust bearing is provided above and below the flange 232, and a radial bearing is provided on the inner peripheral side. A bearing is formed by contact.

  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 provided may be provided in any of the gear modules including the uppermost and lowermost gear modules.

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 (5)

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,
The cylindrical gear is formed by fixing a plurality of gear modules having teeth meshing with other gears on the inner periphery or the outer periphery and overlapping the plurality of layers in the axial direction,
The cylindrical gear is formed by shifting the phase of teeth of the plurality of gear modules and being fixed in an axial direction,
The plurality of gear modules have one end side gear module, a central gear module, and the other end side gear module that are sequentially arranged in the axial direction;
The one end side gear module, the central gear module, and the other end side gear module are formed with the same thickness in the axial direction, respectively.
The bearing unit is characterized in that the flange forming the bearing is formed by projecting the outer periphery or inner periphery of the central gear module from the one end side gear module and the other end side gear module in the radial 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.   The tooth of the gear module has a concave groove extending along the tooth profile at the edge adjacent to the tooth of the other gear module, and viewed from a direction orthogonal to the axial direction. The cross section of the space formed by the concave groove is formed in a shape that gradually narrows in the axial direction from the center of the space toward the tooth surface. Bearing unit.   The bearing unit according to any one of claims 1 to 3, 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 3, wherein the gear module is formed of a wear-resistant steel plate.

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