KR20180027804A - Torque Measuring Washer - Google Patents

Abstract

The present invention relates to a washer capable of visually confirming locking torque for determining fastening force of a bolt. According to one embodiment of the present invention, the torque measuring washer comprises: a compression protrusion protruding from the upper surface; a filling material packing groove corresponding to the compression protrusion but being formed concavely on the lower surface; a filling material filling the filling material packing groove; and a filling material protruding port which is a space for connecting the filling material packing groove and the outer circumferential side so that the filling material can protrude from the outer circumferential side when the compression protrusion is pressed and the filling material is pressed.

Description

[0001] Torque Measuring Washer [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer used for fastening a bolt, and more particularly to a washer capable of visually confirming a locking torque for determining a fastening force of a bolt.

The locking torque is very important for bolt tightening. Recent technological trends are focused on developing products that are smaller and lighter but also have better durability. In order to assemble such a product, precise fastening is required, and various methods for measuring the locking torque of the bolt are proposed. The most popular technique is torque wrench.

However, if the torque wrench is a low-priced product, the error value is high and the reliability of the measurement is degraded when a precise fastening force is required. An expensive torque wrench is excellent in accuracy, however, the versatility deteriorates and it is difficult to maintain the torque wrench. Also, the torque wrench is less accurate than measuring the torque directly at the torque point, because the torque to be measured is lost due to the torque measuring structure of the wrench itself. The biggest problem in measuring the torque of a torque wrench is that after the bolt is tightened, it is difficult to confirm the change of bolt loosening or locking torque with a torque wrench. Even if the bolts are tightened with the proper torque, it is difficult to maintain precise tightening when the torque value changes.

To solve this problem, various anti-loosening techniques are proposed. Bolts, nuts and washers to prevent loosening of the bolts. Of the parts listed above, a washer is a part that is inserted between a seat of a bolt, a nut, and the fastening part, and is used to improve the fastening force when the bolt hole is too large or the surface of the fastening part is not flat, It is used to prevent loosening of the nut. Washers with anti-loosening technology are widely used in bolting.

However, anti-loosening techniques are not an essential solution to this problem. In order to maintain precise tightening, it is necessary to check the locking torque from time to time. Conventional loosening techniques only take into account tightening, and lock torque can not be confirmed.

(Document 1) Korean Patent No. 10-0912835 (Document 2) Korean Patent No. 10-1463456

It is an object of the present invention to provide a washer capable of measuring a locking torque when a bolt is fastened.

It is an object of the present invention to provide a washer capable of constantly confirming a locking torque after completion of fastening of a bolt.

An object of the present invention is to provide a washer capable of measuring and confirming a change in locking torque of a bolt at a low cost.

A torque measuring washer according to an embodiment of the present invention includes at least two pressing protrusions protruding from an upper surface of the washer, at least two filling material grooves recessed in a lower surface corresponding to the pressing protrusions, At least two or more fillers which are spaces for connecting the filler filling grooves and the outer diameter side so that the filler can be projected to the outer diameter side when the pressing projections are pressed and the pressing material is pressed, Wherein the compression protrusions are formed in a circular arc shape having a constant width with the same distance to the center point of the inner diameter of the washer, the lengths of the compression protrusions are different from each other, the filler fill grooves corresponding to the compression protrusions And the filler protrusions are formed to have mutually different lengths so that the outer diameter of the washer is not circular, It characterized in that formed in a curve.

The filling material of the torque measuring washer according to the embodiment of the present invention is characterized by being a silicon material having a low compression set ratio.

The pressing projection of the torque measuring washer according to the embodiment of the present invention includes a pressing projection outer groove formed by being recessed along the periphery of the pressing projection.

The cross section of the torque measuring washer according to the embodiment of the present invention is characterized in that the inner diameter side is formed in an arch shape protruding upward from the outer diameter side.

The inner diameter of the torque measuring washer according to the embodiment of the present invention includes inner notching which is a plurality of grooves formed in the inner circumference portion and the outer diameter of the torque measuring washer according to the embodiment of the present invention is an outer diameter of a plurality of grooves And includes notching.

The torque measuring washer according to the embodiment of the present invention is characterized in that the filler protrusions are formed to have mutually different lengths so that the ratio of the filler volume to the filler protrusion volume is the same.

Therefore, the torque measuring washer according to the embodiment of the present invention can measure the locking torque when the bolt is fastened.

Also, the torque measuring washer according to the embodiment of the present invention can continuously check the locking torque after the bolts are fastened.

Further, the torque measuring washer according to the embodiment of the present invention can measure and confirm a change in the locking torque of the bolt at a low cost.

The effects of the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a perspective view of a torque measuring washer in accordance with an embodiment of the present invention.
2 is a top view of a torque measuring washer according to an embodiment of the present invention.
3 is a cross-sectional view of a torque measuring washer in accordance with an embodiment of the present invention.
4 is a cross-sectional view showing a torque measuring washer according to an embodiment of the present invention before bolt fastening.
5 is a cross-sectional view illustrating a process of bolt fastening a torque measuring washer according to an embodiment of the present invention.
6 is a cross-sectional view of a torque measuring washer according to an embodiment of the present invention after bolted.

Further objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Before describing the present invention in detail, it is to be understood that the present invention is capable of various modifications and various embodiments, and the examples described below and illustrated in the drawings are intended to limit the invention to specific embodiments It is to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like are intended to specify that there are stated features, numbers, steps, operations, elements, parts or combinations thereof, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Also, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, Software. ≪ / RTI >

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a torque measuring washer in accordance with an embodiment of the present invention.

1, a torque measuring washer according to an embodiment of the present invention includes: a compression protrusion 30 protruding from an upper surface; and a torque measuring washer 30 corresponding to the compression protrusion 30, A filler 40 filled in the filler filling groove 41 and a filler 40 filling the filler 40 when the filler 40 is pressed by the squeezing protrusion 30, A filling material protrusion 42 which is a space for connecting the filler filling groove 41 and the outer diameter side.

In addition, the filler 40 of the torque measuring washer according to the embodiment of the present invention is characterized in that it is made of a silicone material having a low compression set ratio.

A pressure is generated in the filler 40 of the filler fill groove 41. When the filler 40 reaches a predetermined pressure or more, the filler 40 comes into contact with the filler fill hole 42, As shown in Fig. Therefore, it is possible to visually confirm whether the filler 40 protrudes on the outer diameter side of the washer, to know the magnitude of the force applied to the upper portion of the washer, and to confirm the locking torque required for bolt fastening.

It is possible to confirm various numbers of locking torques when a plurality of the pressing projections 30, the filler filling grooves 41, the fillers 40 and the filler protrusions 42 are provided in different sizes. A specific description related to this will be described below. However, in this case, it is also possible to construct the fillers 40 in different colors, and to check the size of the various lock torques through the color of the protruding filler 40.

The reason why the filler 40 is formed of a silicone material having a low compression set ratio is to confirm that the locking torque decreases as the bolt is loosened after the bolt is fastened.

FIG. 2 is a top view of a torque measuring washer according to an embodiment of the present invention, and FIG. 3 is a sectional view of a torque measuring washer according to an embodiment of the present invention.

2 and 3, in the torque measuring washer according to the embodiment of the present invention, when at least two of the compression protrusions 30, the filler fill grooves 41 and the filler protrusions 42 are included The pressing protrusions 30 are formed in a circular arc having a constant width with the same distance with respect to the center point of the inner diameter of the washer and the lengths of the arcs are formed to be different from each other, And the filler protrusions 42 are formed to have mutually different lengths so that the outer diameter of the washer is formed as a spline curve that is not an arc.

The compression protrusions 30 and the filler fill grooves 41 and the filler 40 and the filler protrusions 42 are formed to correspond to each other. The combination of the filler protrusions 42 may be formed in plural numbers. This is because it is useful not only to confirm the lock torque of different size as described above but also to check the change of the lock torque.

When a plurality of the crimping projections 30 and the filler filling grooves 41 and the filler 40 and the filler protrusions 42 are provided in order to confirm locking torques of different sizes or to confirm a change in the locking torque, 30 and the filler fill grooves 41 and the filler 40 and the filler protrusions 42 are formed in a partially different shape.

The pressing protrusions 30 and the filler filling grooves 41 are formed in an arc shape having a constant width at the same distance with respect to the center point of the inner diameter of the torque measuring washer and at least two pressing protrusions 30 and filler filling grooves 41 Are formed to be different from each other. 2, 'd1' represents the distance between the pressing protrusion 30 and the filling material filling groove 41 from the center of the inner diameter, and 'd2' represents the width of the pressing protrusion 30 and the filling material filling groove 41. And L1 to 4 denote the lengths of each of the pressing projections 30 and the filler filling grooves 41, respectively. 2, each of the compression protrusions 30 and the filler fill grooves 41 are formed with the same value of d1 and d2, and the compression protrusions 30 and the filler fill grooves 41 are formed, Are formed differently from each other. In FIG. 2, 'L1' is shown as being the shortest, followed by sequentially increasing the length in the order of 'L2' and 'L3', and 'L4' being the longest.

This is in order to apply a constant pressure to each of the pressing projections 30 when the pressing projections 30 are pressed by a bolt head or the like. In bolt tightening, the pressure along the distance from the center axis due to the change in eccentricity occurs differently. Therefore, it is preferable that the pressing projection 30 is formed in a shape maintaining a constant distance from the center of the inner diameter. However, the lengths of the arc shapes are different from each other, which is a structure for allowing each of the pressing protrusions 30 to identify the respective different pressures, and the detailed principle will be described below.

In addition to the structure in which the lengths of the compression projections 30 and the filler fill grooves 41 are different from each other, the lengths of the filler projections 42 are also different from each other. However, since the filling material filling grooves 41 are all spaced by the same distance from the center of the inner diameter, one side of the filling material protruding portion 42 on the side of the filling material filling groove 41 is also spaced the same distance from the center of the inside diameter. In order to separately form the lengths of the filler protrusions 42, the outer diameter of the torque measuring washer is formed as a spline curve rather than an arc.

In FIG. 2, 'D1 to 4' represent the distances of the other sides of the filler protrusions 42 from the center of the inner diameter. In FIG. 2, 'D1' is shown as being the shortest, and the length is sequentially increased in order of 'D2' and 'D3', and 'D4' is shown as being the longest. As the distance of the other side of the filler protrusions 42 from the inner diameter center point is different, the shape of the outer diameter of the washer becomes a spline curve, not an arc. In FIG. 2, the arcs corresponding to the lengths of D1 to 4 are shown by dotted lines. As shown in FIG. 2, the outer diameter of the washer is not circular but gradually decreases from one portion to the center point, It has a curved shape.

This is because it is preferable that the length of the filler protrusion 42 increases as the volume of the compression protrusion 30, the filler fill groove 41 and the filler 40 increases. The reason that the length of the filler protrusions 42 is different and the reason why the length of the filler protrusions 42 increases as the volume of the filler 40 increases is that the lengths of the compression protrusions 30 are different from each other Will be described along with the reasons why it is formed.

The combination of the pressing projection 30 and the filling material filling groove 41 and the combination of the filling material 40 and the filling material protruding portion 42 is preferably formed to be mutually conformed with respect to the inner diameter center point. This is to uniformly distribute the combinations of the pressing projections 30 and the filler filling grooves 41 and the filler 40 and the filler protrusions 42 so that a constant pressure is applied to each combination.

2 shows a structure in which the lengths of the combinations of the pressing projections 30 and the filling material filling grooves 41 and the filling material 40 and the filling material projecting portions 42 are sequentially increased. Alternatively, the non- Do. However, it is preferable that the length of the filler protrusion 42 increases as the volume of the compression protrusion 30, the filler fill groove 41, and the filler 40 increases, and the shape of the outer diameter is also preferably changed.

Further, the compression protrusion of the torque measuring washer according to the embodiment of the present invention includes a compression protrusion outer groove formed by being recessed along the periphery of the compression protrusion.

The outer surface of the outer surface of the outer surface of the pressing projection 30 is for easily deforming the pressing projection 30 when pressure is applied thereto. The thickness of the peripheral portion of the pressing projection 30 is made thinner than the average thickness of the washer due to the pressing groove outer groove 31. [ Therefore, when the pressing projection 30 receives pressure, more deformation occurs in the peripheral portion of the pressing projection 30, and the pressing projection 30 is further pressed toward the filler filling groove 41 side.

Further, the section of the torque measuring washer according to the embodiment of the present invention is characterized in that the inner diameter side is formed in an arch shape protruding upward from the outer diameter side.

The cross section of the washer is formed in the shape of an arch because when the washer is pressed under pressure from the upper side, it is in close contact with the outer diameter side to prevent the filler 40 from being discharged to the outside of the washer. It is to be solid.

The inner diameter of the torque measuring washer according to the embodiment of the present invention includes the inner notching 51, which is a plurality of grooves formed in the inner circumference portion. The outer diameter of the torque measuring washer according to the embodiment of the present invention is formed And an external notching (52) which is a plurality of grooves.

The inner notching 51 is intended to prevent deformation of the washer shape when bolted. In the torque measuring washer according to the embodiment of the present invention, the cross section of the washer can be formed into an arch shape. In this case, when the washer is squeezed, the volume of the inner diameter becomes excessively larger than the volume of the outer diameter. Then, the inner diameter is gathered or the outer diameter is deformed. When the inner notching 51 is provided with the inner diameter, the inner notching 51 can accommodate the change in the shape of the inner diameter, thereby relieving the deformation of the washer.

The outer notching 52 serves to prevent the deformation of the washer shape and to prevent the deformation of the washer. The outer notching 52 can cause an effect of increasing the frictional force of the outer diameter similarly to the outer teeth of the attaching washer.

It is preferable that the inner notch 51 and the outer notching 52 are arranged in a straight line and that the inner notching 51 and the outer notching 52 are equally spaced with respect to the inner center point . In Fig. 2, 'w1' represents the width of the washer and 'w2' represents the width of the washer in which the inner notching 51 and the outer notching 52 are aligned with respect to the inner diameter center. As shown in FIG. 2, 'w2' is formed to be narrower than 'w1'. Thus, by the width of the narrowed washer distributed uniformly, it becomes possible for the " w2 " portion to accommodate the deformation of the washer generated therein, and the deformation of the washer is propagated to the entire washer without being limited to the inside diameter. This is effective in maintaining the overall shape of the washer. For this effect, it is preferable that the inner notching 51 and the outer notching 52 are formed in a portion where the compression projections 30 and the filler filling grooves 41 are not provided.

FIG. 4 is a cross-sectional view showing a torque measuring washer according to an embodiment of the present invention before bolts are fastened, FIG. 5 is a sectional view showing a process of bolt fastening a torque measuring washer according to an embodiment of the present invention, Sectional view showing a torque measuring washer according to an embodiment of the present invention after it is bolted.

As shown in FIGS. 4 and 6, the torque measuring washer according to the embodiment of the present invention is compressed when the bolt is fastened, so that the shape of the compression protrusion 30 is changed so that the filler protrudes toward the outer diameter side. 4 is a view showing a state in which the head of the bolt is in contact with the pressing projection 30. Fig. In this state, the washer is not deformed, but the outer diameter side of the washer is brought into close contact with the lower side and the inner diameter side is separated from the lower side. Therefore, the filler 40 is prevented from protruding to the outside of the washer. When the bolt further descends, the state shown in FIG. 5 is obtained. In Fig. 5, the arcuate phase of the washer end face is flattened by pressure, but the deformation of the pressing projection 30 does not occur. The filler 40 is in close contact with the lower surface but is not under pressure. When the bolt completely presses the washer, the compression protrusion 30 is deformed. 6 is a view showing a state after the bolts are fastened. The pressing projection 30 is pressed downward so that the upper surface of the washer is flattened and the filling material 40 is pressurized and protruded through the filler protrusion 42 to the outside of the washer.

When a plurality of the compression protrusions 30 and the filler 40 are provided in different sizes, the smaller the volume of the filler 40 is, the larger the pressure applied from the head of the bolt becomes, (40) is projected at the latest. The change of the lock torque and the lock torque of the bolt can be confirmed by this phenomenon.

In order to uniformly press the crimping projections 30 and the filler 40 without any difference in eccentricity, the crimping projections 30 are formed in a shape maintaining a constant distance from the inner center point, The volume of the filler 40 is preferably differently formed. The specific shape of the pressing projection 30 related thereto is described above.

The volume of the filler 40 is an important factor in confirming the pressure. In practically confirming the lock torque, the factor that determines the numerical value of the lock torque that can be confirmed is the volume of the filler 40. The pressure required for the filler 40 to protrude to the outside of the washer differs depending on the volume of the filler 40. That is, the greater the volume of the filler 40, the higher the pressure required for the filler 40 to protrude to the outside of the washer.

The unit pressure and the degree of unit strain are always the same irrespective of the total volume of the filler 40. Thus, as the total volume of the filler 40 varies, the total pressure required to deform the filler 40 as a whole also varies. Therefore, a small torque can be confirmed with a small amount of the filler 40, and a large torque can be confirmed with a large amount of the filler 40.

It is preferable that the length of the filler protrusion 42 varies depending on the volume of the filler 40 for more accurate confirmation of the torques. The ratio of the volume of the filler 40 to the volume of the filler protruding portion 42 is set so that the ratio of the volume of the filler 40 to the volume of the filler protruding portion 42 It is preferable that they are all the same regardless of the difference in volume of the fillers 40.

 This is also related to the deformation of the filler 40 of the unit volume depending on the pressure received. The amount of deformation of the entire filler material 40 varies depending on the entire volume of the filler material 40. That is, a small deformation occurs in the small filler 40 and a large deformation occurs in the large amount of the filler 40. As the entire volume of the filler 40 changes, the amount of deformation in which the filler 40 as a whole deforms also changes. Therefore, the length of the filler protrusion 42 for accommodating a small amount of deformation is preferably relatively short, and the length of the filler protrusion 42 for accommodating a large amount of deformation is preferably relatively long.

When the length of the filler protrusions 42 is the same regardless of the volume of the filler 40, an error occurs when the fillers 40 protrude outward due to the predetermined pressure, . Therefore, it is preferable that the length of the filler protrusion 42 varies depending on the volume of the filler 40. Specific conditions relating to the configuration of the filler protrusion 42 related thereto are described above.

If the bolt is loosened after the bolt is fastened and the locking torque is weakened, the filler 40 causes a change in the reverse order of the bolt fastening process. That is, when the pressure of the filler 40 is lowered, the filler 40 is restored to its original shape. It is preferable to apply a material having a low compression set ratio. If the compression set ratio is low, even if the long-time deformed state is maintained, the property of restoring to the initial shape is excellent if the external pressure is low. Silicone rubber may be a material with a low compression set ratio.

When the bolt fastening is weakened and the locking torque is weakened, the extruded filler 40 is restored to the inside, and the change of the lock torque can be visually confirmed through the protrusion of the filler 40, It is possible to confirm the gradual change of the locking torque, and it is very advantageous to maintain an appropriate locking torque.

As described above, the torque measuring washer according to the embodiment of the present invention includes: a compression protrusion protruding from an upper surface; a filler filling groove recessed in a lower surface; a filler filled in the filler filling groove, And a filler protrusion which is a space for connecting the filler filling groove and the outer diameter side so that the filler can protrude to the outer diameter side when the presser foot is compressed and the filler is pressurized, It can be seen that the basic technical idea is that it can be confirmed with the naked eye.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not for purposes of limiting the technical idea of the present invention, but rather are not intended to limit the scope of the technical idea of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Bolt ... B
Bolt hole ... P
Washer body ... 10
Washer Hole ... 20
Crimp projection ... 30
Outer grooves ... 31
Fillings ... 40
Filler filling grooves ... 41
Filler protrusion ... 42
Internal notching ... 51
External notching ... 52

Claims (6)

At least two or more filler grooves corresponding to the pressing projections and recessed in a lower surface thereof; at least two or more fillers filled in the filler fill grooves; And at least two filler protrusions which are spaces for connecting the filler filling grooves and the outer diameter side so that the filler can protrude to the outer diameter side when the presser protrusion is compressed and the pressure of the filler material is pressed, As a result,
The compression protrusions are formed in an arc shape having a constant width with the same distance with respect to the center point of the inner diameter of the washer,
Wherein the filler filling grooves are formed to have different lengths corresponding to the respective pressing projections,
Wherein the filler protrusions are formed to have mutually different lengths so that the outer diameter of the washer is formed as a spline curve,
The torque measuring washer.
The method according to claim 1,
Wherein the filler comprises:
Silicone material with low permanent compression ratio
The torque measuring washer.
The method according to claim 1,
The pressure-
And an outer groove of the pressing projection formed by being recessed along the periphery of the pressing projection
Wherein the torque measuring washer comprises a torque measuring device.
The method according to claim 1,
The cross section of the torque measuring washer,
And the inner diameter side is formed in an arch shape protruding upward from the outer diameter side.
The method according to claim 1,
The inner diameter of the torque measuring washer
A plurality of grooves formed in the inner periphery,
The outer diameter of the torque measuring washer,
The outer notching being a plurality of grooves formed in the outer circumferential portion,
The torque measuring washer.
The method according to claim 1,
The length of the filler protrusions,
The length of the filler material is such that the ratio of the filler volume to the filler material volume is the same
The torque measuring washer.

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