Bearing nut fastener

Abstract

To improve workability of fastening work for fastening a bearing nut.SOLUTION: A bearing nut fastener 1 fastens a bearing nut 75, and includes a fastener body 2 constituted of a plate member and having an engaging portion 20a engaged with the bearing nut 75, and an operation portion 3 integrated with the fastener body 2. The bearing nut fastener 1 further includes a pipe portion 4 as a supported portion supported by a mating member to which the bearing nut 75 is mounted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a bearing nut tightener. [Background technology]

[0002] Conventionally, a tool for tightening a bearing nut that fixes a bearing to a shaft is known (see, for example, Patent Document 1). In this type of tool, multiple claws arranged on the circumference are engaged with grooves in the bearing nut to apply torque. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-246647 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional tool, substantially only the claw portion (engagement portion) comes into contact with the bearing nut, so when an operator applies torque, a force that tilts the tool with respect to the central axis of rotation may be applied, causing the claw portion to fall off the groove of the bearing nut, which may result in poor workability.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to improve workability. [Means for solving the problem]

[0006] The present invention relates to a bearing nut tightening tool for tightening a bearing nut, The fastener body is made of a plate member and has an engagement portion that engages with a bearing nut, and an operation portion is integrated with the fastener body, The bearing nut further has a supported portion that is supported by a mating member to which the bearing nut is attached. Effect of the Invention

[0007] According to the present invention, workability can be improved. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of a bearing nut tightener according to the embodiment. [Diagram 2] 1 is a six-view diagram of a bearing nut tightener according to an embodiment; FIG. [Diagram 3] 1 is a cross-sectional view showing a support structure for a wheel of a vehicle according to an embodiment of the present invention; [Figure 4] 1 is a cross-sectional view of a state in which a bearing nut fastener according to an embodiment is attached to a bearing nut. FIG. [Diagram 5] 1 is a view showing a bearing nut fastener attached to a bearing nut according to an embodiment, as viewed from the operation side in the axial direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0010] [Bearing nut tightening tool configuration] 1 and 2 are a perspective view and six-sided views of a bearing nut tightener 1 according to this embodiment. The bearing nut fastener 1 according to this embodiment is a tool for fastening (or loosening) a bearing nut for fixing a bearing to a mating member. Specifically, as shown in Figures 1 and 2, the bearing nut fastener 1 includes a fastener body 2, an operating part 3 that receives a fastening operation by an operator, and a pipe part 4 that is supported by a mating member (a shaft sleeve 71 described later in this embodiment). In the following, unless otherwise specified, the direction along the central axis Ax of the pipe part 4 is referred to as the "axial direction", the direction perpendicular to the central axis Ax is referred to as the "radial direction", and the rotation direction around the central axis Ax is referred to as the "circumferential direction". In addition, in the axial direction, the side that is attached to the bearing nut (diagonally lower left side in Fig. 1) is referred to as the "attachment side", and the side opposite the attachment side and where the operating part 3 is arranged (diagonally upper right side in Fig. 1) is referred to as the "operation side".

[0011] The fastener body 2 is formed by combining two body members 20 (a first body member 21 and a second body member 22). Each main body member 20 is formed by bending a metal plate member into a U-shape with sheet metal. An engagement portion 20a (claw portion) that engages with a bearing nut during tightening work is protruded from each tip of the U-shape of each main body member 20. That is, the first main body member 21 has a first engagement portion 21a, and the second main body member 22 has a second engagement portion 22a. The two main body members 20 are joined by welding in a state where the two main body members 20 are stacked in the axial direction so that the engagement parts 20a of each of them face the same direction (the axial mounting side) and the circumferential positions (phases) of each of them are approximately orthogonal to each other. In this embodiment, of the two main body members 20, the one arranged on the operation side is referred to as the first main body member 21, and the one arranged on the mounting side is referred to as the second main body member 22. The two main body members 20 are joined so that all the engagement parts 20a satisfy the required concentricity and / or coaxiality with respect to the central axis Ax. The two main body members 20 are formed so that the first main body member 21 is longer than the second main body member 22 by the thickness so that the axial positions of the engagement parts 20a of each of them are approximately the same.

[0012] The operating part 3 is integrated with the fastening tool body 2, and is a part that receives the fastening operation by an operator (torque is input) during fastening work. The operating part 3 in this embodiment is a hexagonal nut, and is joined by welding to the operating side surface of the first body member 21 of the fastening tool body 2. At this time, the operating part 3 is joined so that its center of rotation satisfies required concentricity and / or coaxiality with respect to the central axis Ax. The operation unit 3 is not limited to a hexagonal nut as long as it can be fitted with a tool for inputting torque. For example, it may be a wrench socket that fits with a torque wrench.

[0013] The pipe portion 4 is an example of a supported portion according to the present invention, and is a portion supported by a mating member (a shaft sleeve 71, described later, in this embodiment) to which a bearing nut is attached. The pipe portion 4 in this embodiment is a cylindrical member of a predetermined length having a central axis Ax, and is joined by welding to the mounting side surface (the bottom surface of the U-shape) of the second body member 22 of the fastener body 2. At this time, the pipe portion 4 is joined so that all of the engagement portions 20a and the operating portion 3 (the center of rotation of the operating portion 3) satisfy the required concentricity and / or coaxiality with respect to the central axis Ax. The pipe section 4 is fitted into a recess (a hollow section 71a in this embodiment, described later) of a mating member and supported by the mating member. Therefore, the outer diameter of the pipe section 4 is formed to a fitting dimension relative to the inner diameter of the recess of the mating member that can prevent the bearing nut fastener 1 from falling in the axial direction when torque is applied and allows smooth insertion. The axial length of the pipe section 4 is not particularly limited, but is formed to a length that allows it to be supported by the mating member before the engaging section 20a of the fastener body 2 engages with the bearing nut during fastening work (when the bearing nut fastener 1 is attached).

[0014] The shape and structure of the bearing nut fastener 1 are not limited to those described above. For example, the fastener body 2 may be any body that is made of a plate member and has the engaging portion 20a. The number of body members 20 and the corresponding relationship with the engaging portion 20a are not particularly limited. Furthermore, the shape, number, circumferential position, etc. of the engaging portion 20a are not particularly limited as long as they engage with an engaged portion provided on the bearing nut. For example, in this embodiment, the circumferential phase (angle) of the first engaging portion 21a and the second engaging portion 22a is made to be substantially orthogonal, but it is sufficient that the circumferential phases of the multiple engaging portions 20a are shifted. In addition, the pipe portion 4 does not have to be perfectly cylindrical as long as it has a shape that does not hinder rotation around the central axis Ax when fitted into a mating member and is supported by the mating member without inclining relative to the central axis Ax.

[0015] [How to use the bearing nut tightener] Next, a method of using the bearing nut fastener 1 will be described taking as an example a case where a bearing nut is fastened to a shaft sleeve that supports a wheel. Fig. 3 is a cross-sectional view showing a support structure for a vehicle wheel. Fig. 4 is a cross-sectional view of the bearing nut fastener 1 attached to the bearing nut, and Fig. 5 is a view of the bearing nut fastener 1 attached to the bearing nut, as seen from the operating side in the axial direction. However, in Fig. 5, for ease of understanding, the bearing nut is shown hatched, and the parts of the bearing nut fastener 1 other than the operating part 3 are shown by two-dot chain lines.

[0016] As shown in FIG. 3, in a vehicle such as a forklift, a wheel 61 driven by a drive shaft 62 is supported by a shaft sleeve 71 via a bearing 73. Specifically, the shaft sleeve 71 is formed in a cylindrical shape having a hollow portion 71a and is fixed to a vehicle body. A wheel hub 72 is arranged on the outer periphery of the shaft sleeve 71 so as to be rotatable via the bearing 73. A wheel 63 of the wheel 61 is arranged on the outer periphery of the wheel hub 72 and is fastened and fixed to the wheel hub 72. The drive shaft 62 is inserted into the shaft sleeve 71 and fastened and fixed to the wheel hub 72 in a state in which it can rotate relatively to the shaft sleeve 71. As a result, the drive shaft 62 drives the wheel 61 in a state in which it is rotatably supported by the shaft sleeve 71 via the wheel hub 72.

[0017] A bearing nut 75 is fastened (screwed) to the tip of the shaft sleeve 71 on the vehicle outer side (left side in FIG. 3) before inserting the drive shaft 62. The bearing nut 75 presses the bearing 73a on the vehicle outer side in the axial direction of the shaft sleeve 71 via a washer (spacer) 74, and fixes the shaft system components including the bearing 73a. A plurality of (four in this embodiment) grooves 75a extending in the axial direction of the shaft sleeve 71 are formed on the outer peripheral surface of the bearing nut 75 (see FIG. 5). The grooves 75a are portions that engage with the bearing nut fastener 1 and directly receive torque when the bearing nut 75 is fastened, and are formed in a number, shape, and position (circumferential arrangement) that can correspond to the engaging portions 20a of the bearing nut fastener 1. In this embodiment, four grooves 75a are formed on the outer peripheral surface of the bearing nut 75 at equal intervals on the circumference.

[0018] When performing the tightening work of fixing (tightening) the bearing nut 75 to the shaft sleeve 71, the drive shaft 62 is removed from the shaft sleeve 71 as shown in Fig. 4. That is, the wheel hub 72, the bearing 73a on the outer side of the vehicle, and the washer 74 are sequentially fitted into the shaft sleeve 71, and then the bearing nut 75 is screwed in. The wheel 61 (wheel 63) may be fixed to the wheel hub 72 (not shown in Fig. 4) as long as it does not interfere with the tightening of the bearing nut 75.

[0019] In this state, the worker inserts the pipe portion 4 of the bearing nut fastener 1 into the shaft sleeve 71. At this time, as shown in Fig. 5, the four engagement portions 20a of the bearing nut 75 are aligned with the four groove portions 75a of the bearing nut 75 in the circumferential direction and fitted into the four groove portions 75a. Then, the worker attaches a fastening tool such as a torque wrench to the operating portion 3 and fastens the bearing nut 75 with, for example, a predetermined fastening torque. Conversely, when removing the bearing nut 75, the same procedure is followed: the bearing nut fastener 1 is fitted onto the bearing nut 75, and a fastening tool is attached to the bearing nut fastener 1. Then, torque is applied to the bearing nut fastener 1 via the fastening tool, and the bearing nut 75 is loosened and removed.

[0020] [Technical effect of the present embodiment] As described above, according to this embodiment, the bearing nut fastener 1 that tightens the bearing nut 75 has the pipe portion 4 (supported portion) that is supported by the counterpart member (shaft sleeve 71) on which the bearing nut 75 is attached. Therefore, even if a force is applied that tilts the bearing nut fastener 1 relative to the central axis of rotation when an operator applies torque, the attitude of the bearing nut fastener 1 relative to the mating member can be maintained. Therefore, compared to the conventional method in which the engaging portion was in contact with the bearing nut substantially only at the engaging portion and therefore there was a risk of the engaging portion falling off the groove of the bearing nut, deterioration of operability can be suppressed. In other words, operability can be improved compared to the conventional method.

[0021] Moreover, the bearing nut fastener 1 according to this embodiment is produced by welding the operation section 3 and the pipe section 4 to the fastener body 2 formed by welding together the first body member 21 and the second body member 22 formed by molding plate members using sheet metal, and the first body member 21 and the second body member 22. In other words, the bearing nut fastener 1 can be produced by sheet metal and welding. Generally, most commercially available tools are manufactured by forging or machining, which means that they tend to be expensive due to high mold and processing costs. Therefore, if you try to produce a small number of tools with the same structure in-house, the costs will increase even more. It is also difficult to provide a lineup of multiple sizes for the same reason. In this regard, the bearing nut fastener 1 according to this embodiment can be manufactured by sheet metal and welding as described above, which reduces costs when producing small quantities and makes it relatively easy to provide a lineup of multiple sizes.

[0022] [others] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, the object to be fastened (fastened) by the bearing nut fastener is a bearing nut fastened to a shaft sleeve that supports a wheel. However, the bearing nut fastener according to the present invention can be widely applied to fastening bearing nuts.

[0023] In addition, the details shown in the above embodiment can be modified as appropriate without departing from the spirit of the invention. [Explanation of symbols]

[0024] 1 Bearing nut tightener 2 Fastener body 20 Main body parts 20a Engagement part 21 First body member 21a First engaging part (engaging part) 22 Second body member 22a Second engaging part (engaging part) 3 Control section 4 Pipe section (supported section) 61 wheels 62 Drive shaft 63 Wheels 71 Shaft sleeve (mate part) 71a Hollow portion (recess) 72 Wheel hub 73, 73a Bearings 74 Washer 75 Bearing nut 75a Groove Ax center axis

Claims

1. A bearing nut tightening tool for tightening a bearing nut, The fastener body is made of a plate member and has an engagement portion that engages with a bearing nut, and an operation portion is integrated with the fastener body, The bearing nut further has a supported portion that is supported by a mating member to which the bearing nut is attached. Bearing nut tightening tool.

2. The fastener body is configured by fixing a first body member having a first engagement portion and a second body member having a second engagement portion with the first engagement portion and the second engagement portion being shifted in phase in the circumferential direction.

2. The bearing nut tightener according to claim 1.

3. The first body member is a U-shaped plate member and has the first engagement portion at each end of the U-shape.

3. A bearing nut tightener as claimed in claim 2.

4. The supported portion is configured to be inserted into a recess of the mating member.

2. The bearing nut tightener according to claim 1.

5. the mating member is a shaft sleeve that supports a wheel of a forklift via a bearing, The supported portion is inserted into a hollow portion of the shaft sleeve.

5. A bearing nut tightener according to claim 4.

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