KR20220100277A - Wave washer and wave washer manufacturing method - Google Patents

Abstract

The present invention relates to a corrugated washer, and a corrugated washer manufacturing method for manufacturing the corrugated washer. The corrugated washer comprises: an inner ring extended in a corrugated shape in a circumferential direction based on a hollow portion; an outer ring formed in the corrugated shape in the circumferential direction based on the hollow portion and surrounding both surfaces and an outer circumferential surface of the inner ring; and a through-hole penetrating the outer ring to enable the inner ring to be exposed. The through-hole comprises: a first through-hole penetrating one surface of the outer ring to enable one surface of the inner ring to be exposed; and a second through-hole penetrating the other surface of the outer ring to enable the other surface of the inner ring to be exposed.

Description

WAVE WASHER AND WAVE WASHER MANUFACTURING METHOD

The present invention relates to a corrugated washer disposed on a rotating shaft and configured to be curved in a wavy shape along a circumferential direction, and a corrugated washer manufacturing method.

A washer is a part inserted between the seat of a screw, bolt, nut, etc. and the fastening part, and is mainly used to prevent the screw from loosening due to the vibration transmitted from the power part along the rotating shaft. In this case, the washer may be configured in various types according to functions. Examples include a flat washer, a spring washer, a corrugated washer, and the like.

The corrugated washer is also called a wave washer, a wave washer, and the like, and the functions of a flat washer and a spring washer are combined to perform both functions of preventing relaxation and distributing surface pressure. Currently, Korean Patent Application Laid-Open No. 10-2019-0063047 (“washing machine”, 2019.06.07. Announcement, hereinafter referred to as 'prior literature') is disclosed as a technology using such a corrugated washer on a device. A brief description of the preceding literature is as follows.

As shown in Fig. 1, the prior literature discloses an upper washing shaft 1 connected to the inner tub of a washing machine, a lower washing shaft 2 that transmits power generated from a driving motor to the upper washing shaft 1, and the upper washing shaft 1 and a planetary gear module 3 interposed between the shaft 1 and the lower washing shaft 2 to increase torque by decelerating the rotational force generated by the driving motor. And the anti-friction member 4, the wave washer 5, the auxiliary washer 6 and the fixing ring 7 may be disposed on the upper washing shaft 1 or the lower washing shaft 2 . At this time, as shown in FIG. 2 , the wave washer 5 and the auxiliary washer 6 may be disposed between the friction preventing member 4 composed of a bearing and the fixing ring 7 composed of a C-ring. And the auxiliary washer 6 is made of a pair and disposed on both sides of the wave washer 5 to prevent plastic deformation and damage.

As such, it is conventionally configured to further improve a function through a stacked arrangement of a plurality of washers. However, when stacking different washers, there is a disadvantage in that the time required for the operation and the use of auxiliary materials are increased, and there is a problem in that the damage occurs frequently because the impact is concentrated on some of the plurality of washers.

KR 10-2019-0063047 A (published on June 7, 2020)

The present invention has been devised to solve the problems of the prior art, and an object of the present invention is to provide a corrugated washer formed of a plurality of layers and a method of manufacturing a corrugated washer for producing a corrugated washer formed of a plurality of layers.

Corrugated washer according to the present invention for achieving the object as described above, an inner ring extending in a corrugation along the circumferential direction with respect to the hollow; an outer ring formed in a waveform along the circumferential direction with respect to the hollow, surrounding both sides and an outer circumferential surface of the inner ring; and a through hole passing through the outer ring to expose the inner ring, wherein the through hole includes a first through hole passing through one surface of the outer ring to expose one surface of the inner ring and the inner ring It may include a second through-hole penetrating the other surface of the outer ring so that the other surface is exposed.

In addition, the outer ring, the first body disposed in contact with one surface of the inner ring, the outer diameter is formed larger than the outer diameter of the inner ring; a second body disposed in contact with the other surface of the inner ring, the outer diameter of which is larger than the outer diameter of the inner ring; and a connecting body disposed in contact with the outer circumferential surface of the inner ring to connect the outer side of the first body and the outer side of the second body; And it may be disposed on the second body.

In addition, in the corrugated washer according to the present invention, the inner diameter of the first body and the inner diameter of the second body are formed to be larger than the inner diameter of the inner ring, one end of the inner ring may protrude inward.

In addition, in the corrugated washer according to the present invention, in the position where the first through hole and the second through hole are arranged, the first body and the second body are in contact with both surfaces of the other end of the inner ring, respectively, and of the connection body An inner surface may be in contact with the other end surface of the inner ring.

In addition, the corrugated washer according to the present invention may be disposed at a position where the first through hole and the second through hole face each other.

In addition, the inner and outer widths of the first through hole or the second through hole are formed to be smaller than the inner and outer widths of the outer ring, and may be disposed in the inner and outer center of the outer ring.

In addition, each of the first through hole and the second through hole may be formed in plurality, and may be disposed to be spaced apart from each other in a circumferential direction of the outer ring.

A corrugated washer manufacturing method according to the present invention for achieving the object as described above, the inner ring preparation step of preparing an inner ring extending in a corrugation along the circumferential direction is hollow inside; a first inner ring deformation step of inserting the inner ring into a core part of a mold for manufacturing a corrugated washer, and spreading the inner ring to flatten the mold for manufacturing the corrugated washer; an insert injection step of processing a flat outer ring by injecting a molten resin into the mold for manufacturing the corrugated washer; and a second inner ring deforming step in which the corrugated washer manufacturing mold is opened to restore the inner ring to a corrugated shape.

In addition, the inner ring preparation step, a press processing step of punching a disk-shaped material to form a flat inner ring; a bending processing step of bending the flat inner ring to transform it into a corrugated inner ring; and a heat treatment step of heat-treating the corrugated inner ring.

In addition, in the heat treatment step, the rockwell hardness C scale (Hardness Rockwell C, HRC) with respect to the corrugated inner ring may be heat treated so that 50 2.

In addition, the mold for manufacturing the corrugated washer includes: an upper plate that is mold-opened and mold-closed with each other; and a lower platen; a first core part disposed on the upper surface of the lower platen; and a second core part disposed on a lower surface of the upper plate to face the first core part, wherein the first core part and the second core part include a first core part pressing the lower surface and the upper surface of the inner ring. Each of the pressing part and the second pressing part may be included, but the separation width between the first pressing part and the second pressing part may correspond to the upper and lower thicknesses of the inner ring.

In addition, the first core part or the second core part may include a fixing part for fixing one end of the inner ring.

The corrugated washer according to the present invention according to the configuration as described above has the advantage that the quality can be improved by improving durability and reliability compared to the existing stacked plural washers by preventing wear and damage caused by the use of the device. In addition, a plurality of layers can be integrated through insert injection, which can lead to an improved economic feasibility through cost reduction.

In the method for manufacturing a corrugated washer and a mold for manufacturing a corrugated washer according to the present invention, as the molten resin forming the outer ring is injected in a flat state by pressing both sides of the bent inner ring, the inner ring is restored to the waveform and the outer ring is also Since it can be formed in a waveform together, there is an advantage in that productivity is further improved.

1 is a view showing a power transmission structure of a washing machine according to the prior art.
Figure 2 is a view showing a stacked wave washer according to the prior art.
Figure 3 is a view showing a corrugated washer coupled to the rotating shaft according to the present invention.
4 is a perspective view of a corrugated washer according to the present invention;
5 is a perspective view of a partially cut-away corrugated washer according to the present invention;
6 is a cross-sectional view of a corrugated washer according to the present invention.
7 to 11 are views showing a method of manufacturing a corrugated washer according to the present invention.

Hereinafter, a corrugated washer and a corrugated washer manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings. The drawings introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms. Also, like reference numerals refer to like elements throughout.

If there is no other definition in the technical and scientific terms used at this time, it has the meaning commonly understood by those of ordinary skill in the technical field to which this invention belongs, and the gist of the present invention is unnecessary in the following description and accompanying drawings Descriptions of known functions and configurations that may be blurry will be omitted.

[Wave Washer]

Fig. 3 relates to an embodiment of a corrugated washer according to the present invention, Fig. 3 is a view showing a corrugated washer coupled to a rotating shaft, Fig. 4 is a perspective view of the corrugated washer, and Fig. 5 is a partially cut out corrugated washer A perspective view, Fig. 6 shows a cross-sectional view of the corrugated washer, respectively.

Referring to FIG. 3 , the corrugated washer 10 according to the present invention may be disposed on the rotation shaft 20 connected to the driving device, and is disposed between the seat and the fastening part of the screw, bolt, nut, etc. as described above. It can perform the function of preventing relaxation and dispersing surface pressure. For example, it may be disposed between the bearing 21 and the C-type fixing ring 22 . In addition, the rotating shaft 20 may be a shaft rotating a motor shaft or an inner cylinder when disposed on a washing machine, and the corrugated washer 10 according to the present invention may be applied to various devices in addition to this.

4 and 5 , the corrugated washer 10 according to the present invention may include an inner ring 100 , an outer ring 200 and a through hole 300 . In addition, the corrugated washer 10 may have a hollow (C) through in both directions, and may have a shape that is bent in a wavy shape along the circumferential direction with respect to both directions. Accordingly, a hollow C may be formed in the inner ring 100 and the outer ring 200 as well, and a direction toward the center of the hollow C is defined as an inner direction, and a direction opposite to this is defined as an outer direction to be described later. .

The inner ring 100 may extend in a waveform along the circumferential direction with respect to the hollow (C), the inner end is exposed on the hollow (C) and the outer side is wrapped with the outer ring (200). have. That is, the outer ring 200 may be disposed to surround both sides and the outer circumferential surface of the inner ring 100 . And the outer ring 200 may also extend so as to be curved along the circumferential direction with respect to the hollow (C).

The through hole 300 may be a hole passing through the outer ring 200 so that one surface or the other surface of the inner ring 100 is exposed. At this time, the through-holes 300 may be formed in plurality and may be spaced apart from each other along the circumferential direction of the outer ring 200, and may have a predetermined length L in the circumferential direction and a predetermined width W in the radial direction. have. In addition, the predetermined length L and the predetermined width W of each through-hole 300 may be constant or some may be formed with different dimensions.

The outer ring 200 through which the through hole 300 is penetrated may be divided into an inner ring 210 and an outer ring 220 based on the through hole 300 . At this time, the inner ring 210 may be in contact with an inner surface of the inner ring 100 , and the outer ring 220 may support the other end of the inner ring 100 .

The through-hole 300 may be composed of a first through-hole 310 penetrating in one surface direction and a second through-hole 320 penetrating in the other surface direction with respect to the inner ring 100 . In addition, the first through-hole 310 and the second through-hole 320 are formed in plurality and may be spaced apart from each other in the circumferential direction, and some of the first through-hole 310 and the second through-hole 320 . ) may be arranged in directions opposite to each other.

Referring to FIG. 6 , the inner ring 100 may have a first inner diameter D ₁ , and the outer ring 200 may have a second inner diameter D ₂ . In this case, the first inner diameter (D ₁ ) may be formed to be smaller than the second inner diameter (D ₂ ), so that one end protrudes inward. And the outer ring 200 is a first body 201 disposed in one side direction based on the phase in which the inner ring 100 is disposed, a second body 202 disposed in the other side direction, a connection disposed on the outside It may be divided into a body 203 . At this time, the first body 201 and the second body 202 may be in contact with both surfaces of the inner ring 100 , respectively. In addition, the connection body 203 may be formed in a form in which the outside of the first body 201 and the second body 202 are connected. Here, the inner diameter of the outer ring 220 of the first body 201 and the second body 202 is formed smaller than the inner diameter of the connection body 203, so that the other end of the inner ring 100 can be inserted into a groove. can be submerged.

[Wave washer manufacturing method]

7 to 11 relate to an embodiment of a method for manufacturing a corrugated washer according to the present invention, FIG. 7 is a perspective view of a flat inner ring, FIG. 8 is a front view of the flat inner ring and a corrugated inner ring, FIG. is a view showing that the corrugated inner ring is inserted into the corrugated washer manufacturing mold, FIG. 10 is a cross-sectional view of the core part of the molded mold for corrugated washer manufacturing, and FIG. 11 is a view showing restoration with the corrugated washer. .

7 and 8 , the method for manufacturing a corrugated washer according to the present invention may include an inner ring preparation step. In this case, the inner ring preparation step may include a pressing step, a bending step and a heat treatment step. In the press working step, as shown in FIG. 7 , a flat inner ring 100a having a first inner diameter (D ₁ ) may be formed by punching a disk-shaped material. Thereafter, in the bending step, as shown in FIG. 8 , the flat inner ring 100a may be bent to be transformed into a corrugated inner ring 100b. In addition, the corrugated inner ring 100b formed in the bending step may be heat treated in the heat treatment step, and for example, the Rockwell hardness C scale (Hardness Rockwell C, HRC) may be heat treated to be 50 2 2 .

9 and 10, in the corrugated washer manufacturing method according to the present invention, the corrugated inner ring 100b is inserted into the core of the corrugated washer manufacturing mold 30, but the corrugated washer manufacturing mold 30 of The upper plate 31 and the lower plate 32 are molded to form a first inner ring deformation step of deforming the corrugated inner ring 100b into the shape of the flat inner ring 100a. At this time, to transform the corrugated inner ring 100b into the shape of the flat inner ring 100a, one surface is radially smooth, and the corrugated inner ring 100b has a corrugated trough or It may include compression in a form in which the height of the floor is relatively reduced.

A first core part 40 may be disposed on an upper surface of the lower platen 32 , and a second core part 50 may be disposed on a lower surface of the upper platen 31 . In addition, the first core part 40 and the second core part 50 may be hollow corresponding to the shape of the outer ring 200 when the mold 30 for manufacturing the corrugated washer is molded. In this case, the first core part 40 may include a first pressing part 41 and a first fixing part 42 , and the second core part 50 may include a second pressing part 51 and a second pressing part 51 . A fixing part 52 may be included. Here, the first pressing part 41 and the second pressing part 51 may be disposed at positions opposite to each other vertically, and the first fixing part 42 and the second fixing part 52 also vertically facing each other. It may be disposed at a position that is, a plurality of the inner ring 100 along the circumferential direction may be disposed spaced apart from each other. And the first pressing part 41 and the second pressing part 51 may press the upper and lower surfaces of the flat inner ring 100a, respectively, and the first fixing part 42 and the second fixing part (52) can be fixed and pressed up and down the inner end of the flat inner ring (100a). Through this, the inner ring 100 may be transformed into a flat inner ring 100a. In addition, the first pressing part 41 and the first fixing part 42 and the second pressing part 51 and the second fixing part 52 are spaced apart from each other in the radial direction of the flat inner ring 100a. It may be in the form of a protrusion. And the first pressing part 41 and the first fixing part 42, and the second pressing part 51 and the second fixing part 52, between the inner ring (200) of the outer ring (200) 210) and an empty space may be formed. In addition, an empty space may be formed outside the first fixing part 42 , the second fixing part 52 , and the inner ring 100 in a shape corresponding to the outer ring 220 of the outer ring 200 . .

Then, the corrugated washer manufacturing method according to the present invention may further include an insert injection step of molding the outer ring 200 by injecting the molten resin (S) in a state in which the mold 30 for manufacturing the corrugated washer is molded. At this time, when the molten resin (S) is injected and then cured, the first pressing part 41 and the second pressing part 51 may be formed as the through hole 300, and the first fixing part 42 and The second fixing part 52 may be formed in such a way that one end of the inner ring 100 protrudes inward.

11, in the method for manufacturing a corrugated washer according to the present invention, as the mold for manufacturing the corrugated washer 30 is molded and the flat inner ring 100a is restored to the corrugated inner ring 100b, the flat washer 10a ) may include a second inner ring deformation step in which the washer is transformed into a corrugated washer (10b). At this time, when the flat inner ring 100a is restored to the corrugated inner ring 100b, the formed flat outer ring 200a may be transformed into the corrugated outer ring 200b due to internal pressure. Through this, the present invention can provide a corrugated washer 10 in which the inner ring 100 and the outer ring 200 of different materials are integrated.

As described above, the present invention has been described with specific matters such as specific components and limited embodiment drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above one embodiment. No, various modifications and variations are possible from these descriptions by those of ordinary skill in the art to which the present invention pertains.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims described below, but also all of the claims and all equivalents or equivalent modifications to the claims are said to be within the scope of the spirit of the present invention. will be.

10: Wave washer
20: axis of rotation
21: bearing 22: fixed ring
30: mold for manufacturing corrugated washer
31: upper plate 32: lower plate
40: first core part
41: first pressing part 42: first fixing part
50: second core part
51: second pressing part 52: second fixing part
C: hollow
C ₁ : first hollow C ₂₁ : 2-1 hollow
C ₂₂ : 2-2 hollow
100: inner ring
100a: flat inner ring 100b: corrugated inner ring
200: outer ring 200a: flat outer ring
200b: waveform outer ring 201: first body
202: second body 203: connection body
210: inner ring 220: outer ring
300: through hole
310: first through hole 320: second through hole

Claims (12)

an inner ring extending in a corrugation along the circumferential direction with respect to the hollow;
an outer ring formed in a waveform along the circumferential direction with respect to the hollow, surrounding both sides and an outer circumferential surface of the inner ring; and
a through hole passing through the outer ring to expose the inner ring;
includes,
The through hole is
A corrugated washer comprising a first through hole passing through one surface of the outer ring to expose one surface of the inner ring and a second through hole passing through the other surface of the outer ring to expose the other surface of the inner ring .
According to claim 1,
The outer ring is
a first body disposed in contact with one surface of the inner ring, the outer diameter of which is larger than the outer diameter of the inner ring;
a second body disposed in contact with the other surface of the inner ring, the outer diameter of which is larger than the outer diameter of the inner ring; and
a connecting body disposed in contact with the outer circumferential surface of the inner ring and connecting the outer side of the first body and the outer side of the second body;
includes,
The corrugated washer, characterized in that the first through-hole and the second through-hole are disposed on the first body and the second body, respectively.
3. The method of claim 2,
The corrugated washer, characterized in that the inner diameter of the first body and the inner diameter of the second body are formed to be larger than the inner diameter of the inner ring, and one end of the inner ring protrudes inward.
4. The method of claim 3,
At the position where the first through hole and the second through hole are arranged,
The first body and the second body are in contact with both sides of the other end of the inner ring, respectively,
Corrugated washer, characterized in that the inner surface of the connecting body is in contact with the other end surface of the inner ring.
According to claim 1,
The corrugated washer, characterized in that the first through-hole and the second through-hole are disposed at positions opposite to each other.
According to claim 1,
The inner and outer widths (W) of the first through hole or the second through hole are,
Doedoe formed smaller than the inner and outer width of the outer ring,
Corrugated washer, characterized in that disposed in the inner and outer center of the outer ring.
7. The method according to any one of claims 1 to 6,
Each of the first through-hole and the second through-hole consists of a plurality,
Wave washer, characterized in that spaced apart from each other along the circumferential direction of the outer ring.
An inner ring preparation step of preparing an inner ring having a hollow inside and extending in a corrugation along the circumferential direction;
a first inner ring deformation step of inserting the inner ring into a core part of a mold for manufacturing a corrugated washer, and spreading the inner ring to flatten the mold for manufacturing the corrugated washer;
an insert injection step of processing a flat outer ring by injecting a molten resin into the mold for manufacturing the corrugated washer; and
a second inner ring deformation step in which the corrugated washer manufacturing mold is opened to restore the inner ring to a corrugated shape;
A corrugated washer manufacturing method comprising a.
9. The method of claim 8,
The inner ring preparation step,
A press processing step of punching a disk-shaped material to form a flat inner ring;
a bending processing step of bending the flat inner ring to transform it into a corrugated inner ring; and
a heat treatment step of heat-treating the corrugated inner ring;
A corrugated washer manufacturing method comprising a.
10. The method of claim 9,
In the heat treatment step,
A method for manufacturing a corrugated washer, characterized in that heat treatment is performed on the corrugated inner ring so that a Rockwell hardness C scale (Hardness Rockwell C, HRC) becomes 50 ㅁ2.
The mold for manufacturing the corrugated washer according to any one of claims 8 to 10,
top plate that is mold-gae and mold-closed to each other; and a lower platen;
a first core part disposed on the upper surface of the lower platen;
a second core part disposed on a lower surface of the upper plate to face the first core part;
includes,
The first core part and the second core part,
Comprising a first pressing part and a second pressing part for pressing the lower surface and the upper surface of the inner ring, respectively,
A mold for manufacturing a corrugated washer, characterized in that the spacing width between the first pressing part and the second pressing part corresponds to the upper and lower thicknesses of the inner ring.
12. The method of claim 11,
The first core part or the second core part,
A mold for manufacturing a corrugated washer comprising a fixing part for fixing one end of the inner ring.

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