Rotary trundle structure

Abstract

The present invention relates to a rotary caster structure which realizes mute of a rotary caster having a thrust bearing and a radial bearing. The present invention is characterized in that an upper ring S1 of a thrust bearing S is supported by a castor mounting plate 1, a lower ring S2 is clamped by a flat surface of a support yoke 3, an upper surface of an inner ring R1 of a radial bearing R is fixed by a spacer member, and a lower surface of the inner ring is fixed by a spacer member 5 at a lower end of a rotating shaft, wherein an upper surface of an outer ring of the radial bearing is hooked and fixed by a corner portion of the support yoke.

Description

Technical Field

[0001] This invention relates to a rotating caster structure with excellent noise reduction effect, which is used as a wheel for transport equipment, various types of vehicles, handcarts, etc. Background Technology

[0002] Generally, regarding the casters and trolley shown in Japanese Patent Application Publication No. 2007-22254 (referred to as Patent Document 1), in Patent Document 1... Figure 6 In the second embodiment shown in Figure 8, the rotating shaft is sequentially inserted into a caster mounting plate, a thrust bearing, a first washer, a radial bearing (the yoke is fixed to the outer ring), and a second washer arranged coaxially with the rotating shaft, and the end of the rotating shaft is caulking.

[0003] As a result, each component sandwiched between the flange portion and the end of the rotating shaft is fixed (clamped).

[0004] However, with the above-described structure, the upper surface of the inner ring of the radial bearing abuts against a first washer with a large diameter and different bodies between the thrust bearing and the radial bearing, and the lower surface of the outer ring of the radial bearing is supported by the recessed portion of the yoke of the radial bearing. Therefore, there is a drawback that the load on the bearing is generated separately and noise during vibration cannot be prevented.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2007-22254 Summary of the Invention

[0008] The problem to be solved

[0009] This invention relates to a rotary caster structure that achieves noise reduction for a rotary caster having a simple construction with a thrust bearing and a radial bearing.

[0010] Problem-solving methods

[0011] To solve the above problems, the present invention comprises: a mounting shaft having a flange at its upper end; a mounting plate having a mounting hole into which the mounting shaft is inserted without clearance and into which the mounting hole hooks the flange; a downward horizontal surface formed on the rear surface of the mounting plate; and a support yoke having a hole on the side of the support yoke, through which the mounting shaft passes under the mounting plate, and an upward horizontal surface formed on the hole, the upward horizontal surface facing and parallel to the downward horizontal surface. In this swivel caster structure, the upper ring of the thrust bearing is supported on the downward horizontal surface and the lower ring of the thrust bearing is supported on the upward horizontal surface, including:

[0012] The upward step portion protrudes on the base end side of the upward horizontal surface supporting the yoke, extends along the rotation axis direction, extends to the hole on the yoke side, and has an L-shaped cross section;

[0013] The corner of the upward-stepped section is configured to hook onto the upper part of the outer ring of the radial bearing from above, while the portion below the outer ring is open; and

[0014] A spacer member, suspended along the axis of rotation in the space from the mounting hole to the upward step, and having a lower end abutting against the upper end of the inner ring of the radial bearing; and

[0015] The lower end of the inner ring of the radial bearing is fixed to the lower end of the mounting shaft.

[0016] The effects of the invention

[0017] As a result, since each component sandwiched between the flange portion and the lower end of the rotating shaft can be fixed integrally without gaps, each component will not swing individually, but can effectively bear the load, suppress the occurrence of vibration or noise, and effectively mute during travel. Attached Figure Description

[0018] [ Figure 1 [This is a cross-sectional view of an important part of the swivel caster.]

[0019] [ Figure 2 [ ] is a cross-sectional view of an important part that includes a dust cover that covers the bearing.

[0020] [ Figure 3 [] is an enlarged view of the same important parts.

[0021] [ Figure 4 [ ] is a cross-sectional view showing an important part of another embodiment.

[0022] [ Figure 5 [ ] is a longitudinal sectional view of the caster.

[0023] [ Figure 6 [ ] is a plan view of the caster.

[0024] [ Figure 7 [This is a front view of the caster.] Detailed Implementation

[0025] In the following explanation, preferred embodiments of the invention will be described with reference to the accompanying drawings.

[0026] Example 1

[0027] Regarding the swivel caster 20 of Embodiment 1, an example seen from a longitudinal section is... Figure 5 As shown in the figure, and Figure 6A floor plan is shown, and Figure 7 The front view is shown.

[0028] Figure 1 The enlarged view of the important part shown is a cross-sectional view of the structure around the rotation axis 10 along the axis of rotation 10.

[0029] The rotating shaft 10 has a generally cylindrical shape, and a flange portion 11 is formed on one side in the axial direction.

[0030] In the rotating shaft 10, the bearing mechanism fixed by the flange portion 11 and the retaining crimp portion 12 (whose diameter increases on the lower end side) are accommodated between the caster mounting plate 1 and the support yoke 3 for pivotally supporting the wheel W.

[0031] That is, the caster mounting plate 1 has a generally horizontal flat surface 2a, and a mounting hole 1b and a recessed portion 1c located approximately at its center. The mounting hole 1b has an inner diameter smaller than the outer diameter of the flange portion 11 at the head of the rotating shaft 10, and is capable of inserting the shaft portion 10A of the rotating shaft 10. The recessed portion 1c extends along the outer periphery of the opening end of the mounting hole 1b and continues to extend to the flat surface 1a.

[0032] The recessed portion 1c is recessed such that the thickness of the flange portion 11 is approximately in the same position relative to the horizontal flat surface 2a on the outer periphery.

[0033] Furthermore, the peripheral edge of the mounting hole 1b is a horizontal surface for horizontally hooking the upper surface of the flange portion 11 of the rotating shaft 10, and the upper surface of the flange portion 11 hooked by the mounting hole 1b is set to be approximately the same planar state as the flat surface 2a (see [reference]). Figure 5 ).

[0034] Subsequently, the thrust bearing S is arranged on the outer periphery of the radial bearing R above the radial bearing R, and is inserted between the caster mounting plate 1 and the support yoke 3.

[0035] In the example shown, they are arranged in close contact in the height direction, such that the upper surface of the lower ring S2 of the thrust bearing and the upper surfaces of the inner ring R1 and outer ring R2 of the radial bearing are approximately the same plane.

[0036] Then, the upper surface of the upper ring S1 of the thrust bearing S abuts against the lower horizontal surface 1a of the rear surface of the caster mounting plate 1, and the bottom side of the lower ring S2 of the thrust bearing S abuts against the upper horizontal surface 3a formed on the middle part of the support yoke 3, which will be described later, and becomes a cantilever 3a' that is approximately vertical at the end of the upper horizontal surface 3a.

[0037] In addition, a hole 30 with the same axis as the mounting hole 1b and a larger diameter than the mounting hole 1b is drilled on the upper part of the support yoke 3, and a hole is drilled at a substantially middle position on the upper surface of the support yoke 3.

[0038] In addition, the opening edge of the hole 30 is formed on the yoke side at the end of the upward step portion 3b adjacent to the upward horizontal surface 3a. The upward step portion 3b supporting the yoke 3 and the corner portion 3c on the inner surface side are formed as an upward step portion 3L with an L-shaped cross section, and abut against the upper end of the outer ring R2 of the radial bearing R.

[0039] On the other hand, a spacer 4 with a cylindrical cross-sectional shape is installed directly below the mounting hole 1b. The spacer is made of a washer that abuts against the opening edge of the mounting hole 1b, is fitted to the rotating shaft 10 without clearance, and is suspended at the same position as the corner portion 3c on the inner surface side of the upward step portion 3b. The lower end of the spacer 4 abuts against the upper end of the inner ring R1 of the radial bearing R.

[0040] Furthermore, the lower end of the inner ring R1 of the radial bearing R is fixed by the crimping portion 12 at the lower end of the mounting shaft 10 or by the lower-level spacer 5 consisting of a lower-level washer, which is hooked and fixed by the crimping portion 12.

[0041] On the other hand, the lower end of the outer ring R2 of the radial bearing R is open in the hollow position.

[0042] In the thrust bearing S, since it is formed by the above-described structure, the outer sides of each of its upper ring S1 and lower ring S2 are open, and it is configured such that the lower end of the outer ring R2 of the radial bearing R is open, which can produce a noise reduction effect with a simple structure.

[0043] It should be noted that the upward step portion 3b and the corner portion 3c on the inner surface side of the rear side of the supporting yoke 3 become an upward step portion 3L with an L-shaped cross section, and at the end of the upward horizontal surface 3a, it becomes a cantilever 3e' that is substantially right-angled via the intermediate step portion 3d and via the rear horizontal surface portion 3e.

[0044] Example 2

[0045] exist Figure 2 In the illustrated embodiment 2, a dust cover 6, made of a flexible and elastic synthetic resin or similar material and covering the outer periphery of the thrust bearing S except for the bottom surface, is attached below the mounting plate 1.

[0046] The dust cover 6 is installed by overlapping the rear surface of the mounting plate 1 with the dust cover 6. The dust cover 6 overlaps with the downward horizontal surface 1a and performs the same function as the mounting plate 1, so its description will be omitted.

[0047] Since other constructions are similar to those in Example 1, their descriptions will be omitted.

[0048] Example 3

[0049] exist Figure 3 In the embodiment 3 shown, instead of the washer-shaped spacer 4 which is a different body, a cantilever portion integrally formed with the mounting hole 1b is formed as a spacer 4'. This cantilever portion has the same inner diameter as the edge portion of the hole and extends downward in a cylindrical shape.

[0050] Furthermore, the lower end of the spacer member 4', which is part of the cantilever section, abuts against the upper surface of the inner ring R1 of the radial bearing R without any gap, and distributes the load applied to the center side of the caster mounting plate 1 to the inner ring R1 side of the radial bearing R.

[0051] Since other constructions are similar to those in Example 1, their descriptions will be omitted.

[0052] Example 4

[0053] exist Figure 4 In the illustrated embodiment 4, similar to Figure 3 In the embodiment 3 shown, instead of the washer-shaped spacer 4 which is a different body, a cantilever portion integrally formed with the mounting hole 1b is formed as a spacer 4', which has the same inner diameter as the edge portion of the hole and extends downward in a cylindrical shape.

[0054] Furthermore, the lower end of the spacer member 4', which is part of the cantilever section, abuts against the upper surface of the inner ring R1 of the radial bearing R without any gap, and distributes the load applied to the center side of the caster mounting plate 1 to the inner ring R1 side of the radial bearing R.

[0055] In addition, the lower end of the inner ring R1 of the radial bearing R is hooked and fixed by the step portion 12a formed at the press portion 12 at the lower end of the mounting shaft 10 (without providing the lower-level spacer 5).

[0056] Since other configurations are similar to those in the above embodiments, their descriptions will be omitted.

[0057] Explanation of reference numerals in the attached figures

[0058] 1 Mounting plate

[0059] 1a Downward horizontal surface

[0060] 1b mounting hole

[0061] 3. Support yoke

[0062] 3a Upward horizontal surface

[0063] 3b The upward steps

[0064] 4' Spacer

[0065] 5 Lower-level interval components

[0066] 10 Mounting Shaft

[0067] 11. Flange portion

[0068] 12. Crimping section

[0069] 13. Lower hook section

[0070] 30. Holes supporting the yoke side

[0071] S thrust bearing

[0072] S1 upper circle

[0073] S2 lower circle

[0074] R radial bearing

[0075] R1 inner ring

[0076] R2 outer ring

[0077] W wheel

Claims

1. A swivel caster structure, comprising: Mounting shaft, which has a flange at its upper end; Mounting plate having mounting holes into which the mounting shaft is inserted without gap and through which the flange is hooked; A downward horizontal surface is formed on the rear surface of the mounting plate; as well as A support yoke has a hole on its side, through which the mounting shaft passes below the mounting plate and forms an upward horizontal surface thereon, parallel to the downward horizontal surface. The upper ring of the thrust bearing is supported on the downward horizontal surface, and the lower ring of the thrust bearing is supported on the upward horizontal surface, comprising: An upward step portion rises from the base end side of the upward horizontal surface of the supporting yoke, extends along the rotation axis direction, extends to a hole on the supporting yoke side, and has an L-shaped cross section; The corner of the upward-stepped portion is configured to hook onto the upper part of the outer ring of the radial bearing from above, and the portion below the outer ring is open; and A spacer member, suspended along the rotation axis in the space from the mounting hole to the upward step, and having a lower end abutting the upper end of the inner ring of the radial bearing; and The lower end of the inner ring of the radial bearing is fixed to the lower end of the mounting shaft. The outer sides of each of the upper and lower races of the thrust bearing, vertically clamped by the mounting plate and the supporting yoke, are open and not hooked; and The lower end of the outer ring of the radial bearing is not hooked but open.

2. The swivel caster structure according to claim 1, wherein, The spacer component is a different body from the mounting plate, is formed in the shape of a washer, and is assembled to the mounting shaft.

3. The swivel caster structure according to claim 1, wherein, The spacer is formed by a cantilever that extends along the edge of the mounting hole in the mounting plate and is externally fitted to the mounting shaft.

4. The swivel caster structure according to claim 1, wherein, The lower end of the inner ring of the radial bearing is fixed to the stepped portion of the press-fit portion on the lower end of the mounting shaft.

5. The swivel caster structure according to claim 1, wherein, The lower end of the inner ring of the radial bearing is formed by a lower spacer member that is assembled to the lower end of the mounting shaft and fixed by a press-fit portion.

6. The swivel caster structure according to any one of claims 1 to 5, wherein, The upper surface of the lower ring of the thrust bearing and the upper end surfaces of the inner and outer rings of the radial bearing are arranged in close contact in the height direction, such that the upper surface of the lower ring of the thrust bearing and the upper end surfaces of the inner and outer rings of the radial bearing become the same surface.

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