Rotary component for reduction gear

Abstract

To solve a problem that, when storing rotary components for a reduction gear in a state that a plurality of components are stacked, shapes of the components are deformed due to the interference of both-end portions even if the rotary components are stacked.SOLUTION: A hollow cylindrical rotary component 10 for a reduction gear has a flange part T in a circumferential direction, and communicates from one end side opening part to the other end side opening part, in which an outside diameter of one end side opening part is smaller than an inside diameter of the other end side opening part, a tip part whose outside diameter becomes small as approaching one end side is arranged at the one end side opening part, and in a cross section view parallel with a longitudinal direction of the rotary component 10 for the reduction gear, an angle formed between a ridge line forming the outside diameter of the tip part and a rotating axis O50 of the rotary component 10 for the reduction gear is smaller than an angle formed between a ridge line forming a tapered part of the inside diameter of the other end side opening part and the rotating axis O50 of the rotary component 10 for the reduction gear.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotating part for use as a reducer built into a construction machine. [Background technology]

[0002] Conventionally, construction machinery such as power shovels have used a reducer equipped with a hydraulic motor, in which rotating parts such as rolling bearings and a rotating shaft and sealing members such as O-rings are housed in a hollow cylindrical rotating part called a housing or casing (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-164423 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when storing a large number of manufactured rotating parts (housings or casings), there is a problem when these rotating parts are stacked on top of each other in multiple layers. For example, in the shape of the conventional rotating part 100 for a reducer shown in Fig. 7 to Fig. 9, when the conventional rotating parts 100, 200 for a reducer are stacked in two layers along the direction of the rotation axis O100 as shown in Fig. 10, the part where two (two) rotating parts 100, 200 for a reducer are stacked in upper and lower layers, that is, the tip 111 of the end 110 (210) on the small diameter side of the rotating part 100 (200) and the inner surface 121 (221) of the end 120 (220) on the large diameter side come into contact with each other as shown in Fig. 11, and the shape changes, especially at the part where a seal member such as an O-ring is installed on the inner side of the rotating part, causing a problem that the internal fluid (oil) leaks out.

[0005] Therefore, an object of the present invention is to provide a rotating component for a reducer in which both end portions do not interfere with (come into contact with) each other even when the rotating components are stacked on top of each other when stored individually. [Means for solving the problem]

[0006] In the present invention, in a hollow cylindrical rotating part for a reducer having a flange in the circumferential direction and communicating from an opening on one end side to an opening on the other end side, the outer diameter of the opening on the one end side is smaller than the inner diameter of the opening on the other end side, and the opening on the one end side has a tip part whose outer diameter becomes smaller as it approaches the one end side. In a cross-sectional view parallel to the longitudinal direction of the rotating part for a reducer (along the rotation axis), an angle θ1 formed between a ridgeline forming the outer diameter of the tip part and the rotation axis of the rotating part for a reducer is smaller than an angle θ2 formed between a ridgeline forming a tapered part of the inner diameter of the opening on the other end side and the rotation axis of the rotating part for a reducer.

[0007] In addition, the edge of the tip portion on one end side can be rounded along the circumferential direction when viewed in a cross section parallel to the longitudinal direction of the rotating component for a reducer. Effect of the Invention

[0008] The rotating parts for reducers of the present invention have optimized shapes (dimensions) at both ends so that the both ends do not come into contact when stacked, and therefore the occurrence of contact scratches on both ends (particularly the inner diameter parts) can be prevented even when multiple rotating parts for reducers are stored. As a result, multiple rotating parts for reducers can be stored stacked in the direction of the rotation axis, which is also effective in saving storage space. [Brief description of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view of a reducer 50 using a rotating component 10 for a reducer of the present invention. [Diagram 2] 1 is a cross-sectional view of a rotating component 10 for a reducer according to the present invention. [Diagram 3] FIG. 3 is an enlarged view of part A shown in FIG. [Figure 4] FIG. 3 is an enlarged view of part B shown in FIG. [Diagram 5] 1 is a cross-sectional view showing a state in which rotating components 20 and 30 for a reducer according to the present invention are stacked. [Figure 6] FIG. 6 is an enlarged view of a portion C shown in FIG. [Figure 7] FIG. 1 is a cross-sectional view of a conventional rotating component 100 for a reducer. [Figure 8] FIG. 8 is an enlarged view of a portion X shown in FIG. [Figure 9] FIG. 8 is an enlarged view of a portion Y shown in FIG. [Figure 10] 1 is a cross-sectional view showing a state in which conventional rotating components 100 and 200 for a reducer are stacked. [Figure 11] FIG. 11 is an enlarged view of a portion Z shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The rotating part for a reducer of the present invention will be described with reference to the drawings. Fig. 1 shows a cross-sectional view of a reducer 50 using the rotating part for a reducer 10 according to one embodiment of the present invention, Fig. 2 shows a cross-sectional view parallel to the rotation axis of the rotating part for a reducer 10 of the present invention, Fig. 3 shows an enlarged view of part A (one end side 11) of the rotating part for a reducer 10 shown in Fig. 2, and Fig. 4 shows an enlarged view of part B (the other end side 12) of the rotating part for a reducer 10 shown in Fig. 2.

[0011] The reducer rotating part 10 of the present invention is one of many parts constituting a reducer 50 as shown in Fig. 1, and has an overall hollow cylindrical shape. Since parts necessary for a rotation mechanism centered on a rotation axis (central axis) O50, such as multiple gear parts H, rolling bearings B, and a shaft S, are arranged inside, it is also called a "casing." The reducer rotating part 10 shown in Fig. 1 has a flange part T on the outer periphery of the hollow cylindrical shape. This flange part T has multiple (bolt) holes formed along the circumferential direction of the reducer rotating part 10, and the reducer 50 is constituted by being fastened to other parts such as body parts using multiple bolts or the like.

[0012] The hollow cylindrical rotating part 10 for a reducer communicates from an opening 11K at one end side 11 to an opening 12K at the other end side 12 as shown in Fig. 2, and the flange T described above is formed on (near) the opening 12K at the other end side 12. The outer diameter D11 (φD11) of the opening 11K at the one end side 11 shown in Fig. 2 and Fig. 3 is smaller than the inner diameter D12 (φD12) of the opening 12K at the other end side 12 shown in Fig. 2 and Fig. 4, and the opening 11K at the one end side 11 has a tip portion 11A having a predetermined length L11 in the longitudinal direction (direction along the rotation axis) of the rotating part 10 for a reducer, and the outer diameter D11 of the tip portion 11A gradually decreases as it approaches the opening 11K at the one end side 11 as shown in Fig. 3. In addition, an edge 11E of a tip portion 11A of one end side 11 of the rotating component for a reducer 10 may be rounded along the circumferential direction as shown in FIG.

[0013] As shown in Fig. 3, the tip portion 11A forms an angle θ1 between a virtual line (a virtual line parallel to the rotation axis O of the rotating part 10 for the reducer) e1, which is a reference for one end side of the outer diameter (φD11) of the tip portion 11A, and a virtual line e2 extending from the ridge line 11F forming the tip portion 11A toward the opening 11K. Also, an angle θ2 is formed between a virtual line (a virtual line parallel to the rotation axis O10 of the rotating part 10 for the reducer) h1, which is a reference for one end side of the inner diameter (φD12) of the opening 12K of the other end side 12, and a virtual line h2 extending from the ridge line forming the tapered portion 12T in the opening 12K toward the outside of the opening 12K. Comparing these two angles θ1 and θ2, the angle θ2 is larger than the angle θ1 (θ2>θ1).

[0014] That is, in the reducer rotating part 10 of the present invention, the outer diameter D11 (φD11) of the opening 11K on the one end side 11 is smaller than the inner diameter D12 (φD12) of the opening 12K on the other end side 12. Also, the opening 11K on the one end side 11 has a tip portion 11A whose outer diameter D12 (φD12) becomes smaller as it approaches the one end side 12, and an angle θ1 between a ridge line 11F forming the tip portion 11A and the rotation axis O of the reducer rotating part 10 in a cross-sectional view parallel to the longitudinal direction of the reducer rotating part 10 is smaller than an angle θ2 between a ridge line 12F forming a tapered portion 12T of the inner diameter D12 of the opening 12K on the other end side 12 and the rotation axis O of the reducer rotating part 10.

[0015] Next, a cross-sectional view showing two (two) reducer rotating parts 20, 30 of the present invention stacked (two-tiered) is shown in Fig. 5, and an enlarged view of part C shown in Fig. 5 is shown in Fig. 6. The opening 21K of one end side 21 of the reducer rotating part 20 placed in the upper tier is arranged inside the opening 32K of the other end side 32 of another reducer rotating part 30 placed in the lower tier, as shown in Figs. 5 and 6. The tip 21A of the opening 21K of one end side 21 of the reducer rotating part 20 is placed without interfering with the inside of the opening 32K of the other end side 32 of the other reducer rotating part 30, as shown in Fig. 6.

[0016] This is because the outer diameter D21 (φD21) of the opening 21K of one end side 21 of the rotating part 20 for the reducer placed on the upper tier is smaller than the inner diameter D32 (φD32) of the opening 32K of the other end side 32 of another rotating part 30 for the reducer placed on the lower tier, and the angle formed by the ridge forming the tip portion 21A, whose outer diameter D21 becomes smaller as it approaches the opening 21K of the one end side 21 of the rotating part 20 for the reducer, and the rotation axis (not shown) of the rotating part 20 for the reducer is smaller than the angle θ22 formed by the imaginary straight line h22 extending from the tapered portion 32T of the inner diameter D32 (φD32) of the opening 32K of the other end side 32 and the imaginary line (imaginary straight line parallel to the rotation axis of the rotating part 20 for the reducer) h21 that serves as the reference for one end side of the inner diameter D32 (φD32) of the rotating part 20 for the reducer.

[0017] Also, by subjecting the edge of the tip portion 21A of the one end side 21 of the rotating part for a reducer 20 placed on the upper tier to R-chamfering along the circumferential direction as shown in Fig. 6, it is possible to prevent interference with the inside (tapered portion 32T) of the opening portion 32K of the other end side 32 of the rotating part for a reducer 30 placed on the lower tier. Furthermore, by making the length L32 in the longitudinal direction of the opening portion 32K of the other end side 32 of another rotating part for a reducer 30 placed on the lower tier longer than the length of the tip portion 21A of the one end side 21 of the rotating part for a reducer 20 placed on the upper tier (the length corresponding to the length L11 shown in Fig. 3), it is also possible to prevent interference between the rotating parts for a reducer 20 and 30 placed on the upper and lower tiers. [Explanation of symbols]

[0018] 10,20,30 Rotating parts for reducers 11, 21, 31 One end side of the rotating part for the reducer 11A, 21A tip 11E Tip edge 11F Ridge forming the tip 11K, 21K Opening on one end 12, 22, 32 Other end side of rotating parts for reducer 12K, 32K Opening on the other end 12T, 32T The tapered inner diameter of the opening on the other end 50 reducer D11, D21 Outer diameter of opening on one end D12, D32 Inner diameter of the opening on the other end L11 Length of tip L32 Length of the opening on the other end O10, O50 Rotating shaft (center shaft) of rotating parts for reducers T Tsuba e1, e2 Virtual line h1,h2,h21,h22 Virtual lines θ1 is the angle between two imaginary lines e1 and e2 θ2 is the angle between two imaginary lines h1 and h2 θ22 The angle between two imaginary lines h21 and h22

Claims

1. A hollow cylindrical rotating part for a reducer having a flange in the circumferential direction and communicating from an opening on one end side to an opening on the other end side, wherein an outer diameter (D11) of the opening on the one end side is smaller than an inner diameter (D12) of the opening on the other end side, and the opening on the one end side has a tip portion where the outer diameter (D11) becomes smaller the closer it is to the one end side, and when viewed in a cross section parallel to the longitudinal direction of the rotating part for the reducer, an angle (θ1) formed between a ridge line forming the tip portion and a rotation axis of the rotating part for the reducer is smaller than an angle (θ2) formed between a ridge line forming a tapered portion of the inner diameter of the opening on the other end side and the rotation axis of the rotating part for the reducer.

2. 2. The rotating part for a reducer according to claim 1, wherein an edge of a tip portion on the one end side is rounded and chamfered along the circumferential direction when viewed in a cross section in a longitudinal direction of the rotating part for a reducer.

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