Fixed support structure of a rotating shaft

Abstract

This invention provides a fixed support structure for a rotating shaft that eliminates the need for riveting during assembly, ensures strength, and prevents the nut from loosening. It comprises: a ring (92) having an annular portion (92a) covering the outer periphery of a nut (90) and a claw portion (92c) extending radially inward from the shaft end side of the nut (90); and a retaining ring (94) fixing the ring (92) to the shaft end side, having an external spline (90b) formed on the outer periphery of the nut (90), an internal spline (92b) formed on the inner periphery of the annular portion (92a), and a retaining groove (80b) formed on the shaft (80) for engaging with the claw portion (92c). Therefore, the loosening of the nut (90) due to rotational movement is limited by the spline engagement of the nut (90) and the ring (92) and the engagement groove (80b), so there is no need for riveting during assembly, and the strength can be ensured and the loosening of the nut can be prevented.

Description

Technical Field

[0001] This utility model relates to a fixed support structure for a rotating shaft, which fixes the axial position of a fastened object on the rotating shaft by fastening a nut to the threaded portion at the shaft end of the rotating shaft. Background Technology

[0002] It is known to have a fixed support structure for a rotating shaft that secures the axial position of an object fastened to the rotating shaft by tightening a nut at the threaded portion of the shaft end. For example, the device described in Patent Document 1 is such a device. Patent Document 1 discloses a structure in which the axial position of a gear fitted onto the shaft is fixed by tightening a nut to the threaded portion of the rotating shaft end, thereby preventing the gear from falling off.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2013-200015

[0004] However, in the fixed support structure for the rotating shaft described in Patent Document 1, if the nut loosens due to rotational changes in the shaft, the gear (the fastened object) fixed to the shaft may also loosen. To prevent the nut from loosening, it is considered to use a nut with a riveting part, and to perform a riveting operation after the nut is tightened, fitting it into a groove formed in the shaft. However, in this method, the operation time required to deform the riveting part of the nut leads to increased costs. In addition, since the deformation of the riveting part is limited, there is a problem such as insufficient strength under high loads. Utility Model Content

[0005] This utility model was developed in light of the above circumstances, and its purpose is to provide a fixed support structure for a rotating shaft that eliminates the need for riveting during assembly, ensures strength, and prevents the nuts from loosening.

[0006] The present invention relates to a fixed support structure for a rotating shaft, wherein a threaded portion is provided at the shaft end of the rotating shaft, and the axial position of the fastened object on the rotating shaft is fixed by fastening a nut to the threaded portion, wherein (a) it comprises: a ring having an annular portion covering the outer periphery of the nut and a claw portion extending radially inward on the shaft end side of the nut; and a retaining ring fixing the ring on the shaft end side of the ring; (b) an external spline is formed on the outer periphery of the nut, an internal spline is formed on the inner periphery of the annular portion, and a groove is formed on the rotating shaft to engage with the claw portion.

[0007] According to the fixed support structure of the rotating shaft of this utility model, it comprises: a ring having an annular portion covering the outer periphery of the nut and a claw portion extending radially inward from the shaft end side of the nut; and a retaining ring fixing the ring to the shaft end side, wherein an external spline is formed on the outer periphery of the nut, an internal spline is formed on the inner periphery of the annular portion, and a groove is formed on the rotating shaft to engage with the claw portion. Thus, the nut's loosening due to rotational movement is limited by the spline engagement between the nut and the ring, and the engagement of the claw portion with the groove, thereby eliminating the need for riveting during assembly and ensuring strength while preventing the nut from loosening.

[0008] Preferably, by appropriately changing the thickness of the claw portion, the strength can be improved, enabling it to withstand high loads applied to the nut. Additionally, preferably, by appropriately changing the number of claw portions and grooves in the plurality of rings, the load on each part can be reduced, thereby also enabling it to withstand high loads applied to the nut. Attached Figure Description

[0009] Figure 1 This is a diagram illustrating a conventional example of a fixed support structure for a rotating shaft. Figure 1 (a) is a diagram viewed axially from the end of the shaft. Figure 1 (b) is Figure 1 (a) is a sectional view of A-C1.

[0010] Figure 2 These are figures illustrating an embodiment of the present invention regarding the fixed support structure for a rotating shaft. Figure 2 (a) is a diagram viewed axially from the end of the shaft. Figure 2 (b) is Figure 2 (a) is a cross-sectional view of B-C2.

[0011] Figure 3 This is an explanation Figure 2 A diagram showing the shape and structure of the ring. Figure 3 (a) is a diagram viewed axially from the end of the shaft. Figure 3 (b) is Figure 3 (a) shows a cross-sectional view of BB. Detailed Implementation

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, in the embodiments, the drawings are appropriately simplified or modified, and may not accurately depict the dimensional ratios and shapes of the various parts.

[0013] Figure 1 This is a diagram illustrating the fixed support structure (hereinafter referred to as shaft support structure) 20 of a conventional example of a rotating shaft. Figure 1 (a) is a diagram viewed axially from the end of the shaft. Figure 1 (b) is viewed from the left side of the paper. Figure 1 (a) is a sectional view of A-C1.

[0014] The shaft support structure 20 supports, for example, a rotating shaft (hereinafter referred to as a shaft) 40 in the vehicle 10 so that it can rotate relative to the housing 30 inside the vehicle 10. The shaft support structure 20 includes a shaft 40, a bearing 50, a washer 52, and a nut 60.

[0015] like Figure 1 As shown in (a) and (b), the shaft 40 is supported by a bearing 50 fitted with a plurality of rollers 50a, allowing it to rotate relative to the housing 30 about axis C1. Figure 1 In (b), the cross section of shaft 40 is represented by a slash.

[0016] The nut 60 has a cylindrical riveting portion 60b at a position closer to the shaft end than the internal thread 60a to prevent loosening. Additionally, a riveting groove 40b (located at 4 points in the figure) is formed on the outer circumferential surface of the shaft 40 that contacts the riveting portion 60b. After the nut 60 is threaded onto the shaft 40, a riveting operation is performed to tighten the riveting portion 60b toward the riveting groove 40b. The riveting portion 60b deforms, and its inner circumference enters the riveting groove 40b, restricting the rotation of the nut 60 and thus preventing loosening.

[0017] However, in the existing example, the operation time required to deform the riveting portion 60b of the nut 60 leads to increased costs. Furthermore, since the deformation amount of the riveting portion 60b is limited, there is a problem of insufficient strength under high loads. This is because: when the nut 60 is rotated, the riveting groove 40b acts as a wall, restricting rotation; however, if the deformation amount of the riveting portion 60b is large, plastic deformation occurs, resulting in weakened strength. Therefore, it is necessary to reduce the depth of the riveting groove 40b, etc.

[0018] Therefore, in the shaft support structure of this embodiment, as described later... Figure 2 and Figure 3 The structure described herein is designed to prevent the nut from loosening.

[0019] Figure 2 This is a diagram illustrating the shaft support structure 70 of this embodiment. Figure 2 (a) is a diagram viewed axially from the end of the shaft. Figure 2 (b) is viewed from the left side of the paper. Figure 2 (a) is a cross-sectional view of B-C2. Additionally, Figure 3 This is an explanation Figure 2 A diagram showing the shape and structure of the rings in the diagram. Figure 3 (a) is a diagram viewed axially from the end of the shaft. Figure 3 (b) is viewed from the left side of the paper. Figure 3(a) is a cross-sectional view of BB.

[0020] The shaft support structure 70 includes a shaft 80, a bearing 50, a gasket 52, a nut 90, a ring 92, and a snap ring 94.

[0021] like Figure 2 As shown in (a) and (b), with Figure 1 Similarly, shaft 80 is supported by bearing 50 so that it can rotate relative to housing 30 about axis C2. Figure 2 In (b), the cross-section of shaft 80 is indicated by a slash. Bearing 50 is positioned along the axis C2 by a washer 52 fitted into the outer periphery of shaft 80. Nut 90 is fastened to external thread 80a formed on the outer periphery of shaft 80 using an internal thread 90a formed on the inner circumferential surface, thereby fixing the axial position of shaft 80, i.e., preventing movement along the axis C2. Furthermore, an external spline 90b is formed on nut 90 in a direction parallel to the axis C2 of the outer periphery. Additionally, a locking groove 80b (four locations shown in the figure) is formed on shaft 80 from the shaft end along the axis C2 direction, engaging with the claw portion 92c of ring 92 (described later). The external thread 80a corresponds to the "thread portion" of this invention, and the locking groove 80b corresponds to the "groove" of this invention.

[0022] like Figure 3 As shown, ring 92 is a generally disc-shaped component with an annular portion 92a. An inner spline 92b, which engages with the outer spline 90b of nut 90, is formed on the inner circumferential surface of the annular portion 92a covering the outer periphery of nut 90. Furthermore, a portion of the disc-shaped portion of ring 92, which forms the axial end side of nut 90, is hollowed out, such as... Figure 3 As shown in (a), a claw portion 92c (located at 4 in the figure) is formed with a locking groove 80b extending radially inward and being inserted into and engaged with the shaft 80 during installation.

[0023] like Figure 2 As shown in (b), the ring 92 is mounted on the shaft end side (right side of the paper) of the nut 90 in such a way that the inner spline 92b of the ring 92 engages with the outer spline 90b of the nut 90 and the claw portion 92c is embedded and engaged in the engagement groove 80b of the shaft 80. Thus, the rotation of the nut 90 is limited by the engagement of the nut 90 with the spline of the ring 92 and the engagement of the claw portion 92c of the ring 92 with the engagement groove 80b of the shaft 80.

[0024] Preferably, the strength can be improved by appropriately changing the thickness T of the claw portion 92c. Furthermore, preferably, the load on each part can be reduced by appropriately changing the number of claw portions 92c and the number of engaging grooves 80b.

[0025] The retaining ring 94 is a ring with spring properties, which is inserted into the fixing groove 80c of the shaft 80 located on the shaft end side of the ring 92, so as to fix the ring 92 in a way that prevents it from moving along the axis C2.

[0026] As described above, according to this embodiment, it includes: a ring 92 having an annular portion 92a covering the outer periphery of the nut 90 and a claw portion 92c extending radially inward from the shaft end side of the nut 90; and a retaining ring 94 fixing the ring 92 to the shaft end side, having an external spline 90b formed on the outer periphery of the nut 90, an internal spline 92b formed on the inner periphery of the annular portion 92a, and a retaining groove 80b formed on the shaft 80 for engaging with the claw portion 92c. Thus, the nut 90 is prevented from loosening due to rotational movement by the spline engagement between the nut 90 and the ring 92, and the engagement of the claw portion 92c with the retaining groove 80b. Therefore, riveting during assembly is unnecessary, and strength is ensured while preventing the nut 90 from loosening.

[0027] Furthermore, according to this embodiment, by appropriately changing the thickness T of the claw portion 92c, the strength can be increased, thus enabling the handling of high loads applied to the nut 90. Additionally, preferably, by appropriately changing the number of claw portions 92c and engaging grooves 80b, the load on each part can be reduced, thereby also enabling the handling of high loads applied to the nut 90.

[0028] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the above description is only one implementation method. The present invention can be implemented in various ways with modifications and improvements based on the knowledge of those skilled in the art.

[0029] Explanation of reference numerals in the attached figures:

[0030] 50…Bearing (fastened object); 52…Shim (fastened object); 70…Shaft support structure (fixed support structure for rotating shaft); 80…Shaft (rotating shaft); 80a…External thread (threaded part); 80b…Matching groove; 90…Nut; 90b…External spline; 92…Ring; 92a…Annular part; 92b…Internal spline; 92c…Claw part; 94…Snap ring.

Claims

1. A fixed support structure for a rotating shaft, wherein a threaded portion is provided at the end of the rotating shaft, and the axial position of a fastened object on the rotating shaft is fixed by tightening a nut into the threaded portion, characterized in that, It comprises: a ring having an annular portion covering the outer periphery of the nut and a claw portion extending radially inward on the axial end side of the nut; and a retaining ring for securing the ring on the axial end side of the ring. An external spline is formed on the outer periphery of the nut, an internal spline is formed on the inner periphery of the annular portion, and a groove is formed on the rotating shaft to engage with the claw portion.

Images