Gear with bearing

Abstract

To provide a gear with a bearing which can prevent falling of rollers during assembly in a full complement roller bearing which does not include a retainer without fail and enables reduction of costs.SOLUTION: A structure of a gear 100 with a bearing according to the invention includes: an outer ring 110 in which teeth 112 are formed on an outer peripheral surface; an inner ring 120 disposed at the inner side of the outer ring 110; a plurality of rollers 130 which roll between the outer ring 110 and the inner ring 120; grooves 122 each of which is formed in at least one of ends of the inner ring 120; step parts 114 each of which is formed in at least one of ends of an inner periphery of the outer ring 110; and washers 140a, 140b each of which is installed on the groove 122 in an annular form and combined with the step part 114 of the outer ring 110.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a gear with bearings used in a planetary gear mechanism of a hydrostatically driven reduction gear device. [Background technology]

[0002] Generally, hydraulically driven reduction gears are composed of a planetary gear mechanism. The gears included in the planetary gear mechanism are rotatably mounted on a shaft by an inner ring and rollers, and a bearing is sometimes used to hold this shaft. If this bearing is a full complement type, a cage is not used, and the rollers may fall off when the bearing is assembled.

[0003] For example, Patent Document 1 discloses a reduction gear device equipped with a reduction mechanism having "a sun gear, planetary gears meshing with the sun gear, a gear mounting portion supporting the planetary gears for free rotation, and a carrier on which the gear mounting portion is mounted, wherein the gear mounting portion supports the planetary gears at one end and is constituted by a shaft having a treatment layer on its outer circumferential surface in place of a rolling bearing member."

[0004] In the reduction gear of Patent Document 1, a planetary gear is fitted onto the shaft via a bearing. The bearing is a needle roller bearing that does not have an inner race (rolling member), and is composed of a ring-shaped cage and a number of rollers that are rotatably supported on the peripheral wall of the cage. The bearing is fitted onto the shaft, and the planetary gear is then fitted onto the shaft, so that the rollers roll (roll) on the treatment layer of the shaft and roll (roll) on the inner peripheral surface of the planetary gear. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-343662 A Summary of the Invention [Problem to be solved by the invention]

[0006] By adopting a configuration including a cage as in Patent Document 1, it is possible to effectively prevent the rollers from falling off during assembly. However, since bearings including a cage are more expensive than full complement bearings, they may not be adopted depending on the cost. Therefore, there has been a demand for the development of a configuration that prevents the rollers from falling off without using a cage.

[0007] In view of the above problems, the present invention aims to provide a gear with bearing that can reliably prevent rollers from falling off during assembly in a full complement bearing that does not include a cage, thereby enabling costs to be reduced. [Means for solving the problem]

[0008] In order to solve the above problems, a typical configuration of a bearing gear according to the present invention is characterized by comprising an outer ring having teeth formed on its outer peripheral surface, an inner ring arranged inside the outer ring, a plurality of rollers rolling between the outer ring and the inner ring, a groove formed in at least one end of the inner ring, a step formed in at least one end of the inner circumference of the outer ring, and a washer fitted in the groove and combined with the step of the outer ring. Effect of the Invention

[0009] According to the present invention, it is possible to provide a gear with bearing that can reliably prevent rollers from falling off during assembly in a full complement bearing that does not include a cage, thereby enabling costs to be reduced. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is an exploded perspective view of the bearing gear according to the present embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Diagram 3] 1A to 1C are diagrams illustrating an assembly procedure for the bearing gear of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific values ​​shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present invention are not shown.

[0012] Fig. 1 is an exploded perspective view of a bearing gear 100 according to this embodiment. Fig. 2 is a cross-sectional view taken along the line AA in Fig. 1. Fig. 2 shows the bearing gear 100 in an assembled state, which is disassembled in Fig. 1.

[0013] 1 and 2, a bearing gear 100 of this embodiment is a full complement bearing including an outer ring 110, an inner ring 120, rollers 130, and washers 140a, 140b. The outer ring 110 is a cylindrical member having teeth 112 formed on its outer circumferential surface. The inner ring 120 is a cylindrical member disposed inside the outer ring 110, through which a shaft (not shown) is inserted. The rollers 130 are disposed between the outer ring 110 and the inner ring 120, and roll between them.

[0014] A feature of the bearing gear 100 of this embodiment is that grooves 122 are formed at both ends (inner ring end 120a, inner ring end 120b) of the outer peripheral surface of the inner ring 120, and steps 114 are formed at both ends (outer ring end 110a, outer ring end 110b) of the inner peripheral surface of the outer ring 110. Washers 140a, 140b are disc-shaped members attached to both ends of the outer ring 110 and the inner ring 120, respectively, and have pawls 142 formed on their inner circumferences.

[0015] 3 is a diagram for explaining the assembly procedure of the bearing gear 100 of this embodiment. When assembling the bearing gear 100, first, as shown in Fig. 3(a), the inner ring 120 is assembled to the washer 140a placed flat with the pawls 142 facing up. As a result, the pawls 142 of the washer 140a are fitted in the grooves 122 formed in the inner ring end 120a of the inner ring 120 as shown in Fig. 2.

[0016] Next, the outer ring 110 is assembled as shown in Fig. 3(b). At this time, the step 114 formed on the outer ring end 110a of the outer ring 110 is assembled with the outer periphery of the washer 140a. Then, multiple rollers 130 are inserted between the outer ring 110 and the inner ring 120 as shown in Fig. 3(c).

[0017] 3(d), a washer 140b is attached to the other end of the outer ring 110 and the inner ring 120. As a result, the claws 142 of the washer 140b are fitted into the grooves 122 formed in the inner ring end 120b of the inner ring 120 as shown in FIG.

[0018] In the conventional full complement bearing, when the assembled bearing gear 100 was lifted for assembly, the inner ring, rollers, and washers sometimes fell off the outer ring. This resulted in an increase in the amount of work required to redo the assembly, leading to a decrease in work efficiency and therefore manufacturing costs.

[0019] In contrast, in the bearing gear 100 of this embodiment, the washer 140a is annularly attached to the inner ring 120 at the pawls 142 and fitted into the step portion 114 of the outer ring 110. This makes it possible to effectively prevent the rollers 130 and the outer ring 110 from falling off when the outer ring 110 and the inner ring 120 are reversed. Therefore, it is possible to prevent the rollers 130 and the outer ring 110 from falling off in a full roller bearing, and a cage is not required. This makes it possible to reduce the cost required for the cage and improve the work efficiency during assembly.

[0020] In the embodiment described above, a configuration in which the grooves 122 are formed on both ends of the inner ring 120 and the steps 114 are formed on both ends of the inner circumference of the outer ring 110 has been exemplified, but the present invention is not limited to this. The above-mentioned effects can also be obtained with a configuration in which the grooves 122 are formed on at least one end of the inner ring 120 and the steps 114 are formed on at least one end of the inner circumference of the outer ring 110.

[0021] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an example. It is clear that a person skilled in the art can think of various modified or altered examples within the scope of the claims, and it is understood that such examples also naturally belong to the technical scope of the present invention. [Industrial Applicability]

[0022] INDUSTRIAL APPLICABILITY The present invention can be utilized as a bearing gear for use in a planetary gear mechanism of a hydraulically driven reduction gear device. [Explanation of symbols]

[0023] 100... gear with bearing, 110... outer ring, 110a... outer ring end, 110b... outer ring end, 112... teeth, 114... step, 120... inner ring, 120a... inner ring end, 120b... inner ring end, 122... groove, 130... roller, 140a... washer, 140b... washer, 142... pawl

Claims

[Claim 1] an outer ring having teeth formed on an outer peripheral surface; an inner ring disposed inside the outer ring; a plurality of rollers that roll between the outer ring and the inner ring; a groove formed in at least one end of the inner ring; a step portion formed on at least one end of an inner circumference of the outer ring; a washer that is annularly fitted in the groove and that is combined with a step portion of the outer ring; A gear with bearings comprising:

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