JP2013024412A - Round plain washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To complete robust and stable fastening and joining by making all alignment including a fastened object favorable and in an unstressed condition when using a bolt or a nut or both together in fastening and fixing.SOLUTION: A round plain washer is centripetal with respect to a bolt hole of the fastened object and to the bolt and the nut which are fastening bodies. The robust and stable fastening and joining having the favorable alignment in an unstressed condition can be completed.

Description

  The present invention relates to a round flat washer having a special function.

  In the case of using both bolts and nuts used for fastening and fixing, it has been widely used to use a round flat washer for the purpose of protecting the object to be fastened, improving the stability of the seating surface, and preventing loosening.

  However, the conventional standardized round flat washer is sufficient for general use, but is insufficient when a wider range of functions is required. The broader functions are the alignment of bolts and nuts with respect to the object to be fastened, the transmission of a uniform fastening force, and the fastening state without stress.

  With standardized round flat washers, the hole diameter is larger than the bolt diameter to be used, and if not installed carefully, the center of the bolt and the flat washer will shift, and the fastening force will be even. Not transmitted to the seating surface. Also, due to manufacturing tolerances, the parallelism of the upper and lower surfaces is not uniform, and combined with the tolerance of the squareness of the bolt shaft and head seat surface used in combination, the bolt shaft and head or seat in the fastened state Excessive stress or stress tends to be applied to the surface.

  As these improvement measures, those disclosed in the design registration No. 1413164 are known, but still the manufacturing tolerance of existing bolts and nuts cannot be reduced.

  Therefore, we developed a round flat washer with a shape that eases the manufacturing tolerances of existing bolts and nuts and ensures good alignment without any special care.

  Design registration No. 143164

  The present invention provides a round flat washer that can improve poor alignment, stress, and uneven fastening force due to manufacturing tolerances of fastening parts in fastening and fixing using bolts or nuts and both. That is.

  The round flat washer according to the invention of claim 1 is characterized by having centripetal property with respect to the bolt hole of the fastened object. Specifically, a portion where the fastening surface of the round flat washer and the through hole intersect is inclined in the axial direction of the bolt, and the inclined portion is shaped along the chamfered portion of the object to be fastened. Thereby, the effect that the to-be-fastened object and the washer are aligned is exhibited.

  The round flat washer according to the invention of claim 2 is characterized in that, in the washer of claim 1, the round washer has centripetal property even with respect to a bolt generating a fastening force. Specifically, the round flat washer according to claim 1 is located at a portion where the fastening surface and the through hole intersect, and in particular, the side in contact with the bolt head is inclined in the axial direction of the bolt. The bolt has a shape that follows a corner R provided at a portion where the head portion and the shaft portion intersect or a shape that allows the corner R to escape. This demonstrates the effect of aligning the object to be fastened, the washer and the bolt.

  The round flat washer according to the invention of claim 3 is characterized in that, in the washer of claim 1, when the nut is fastened with a nut, the nut also has centripetality. Specifically, the round plain washer according to claim 1 is located at a portion where the fastening surface and the through hole intersect, and in particular, the side in contact with the nut is inclined in the axial direction of the bolt, and the inclined portion is the nut. It is characterized by having a shape along the chamfered portion. As a result, in addition to the effect of aligning the object to be fastened and the washer, the effect of aligning the nut and washer when tightening using the nut is exhibited.

  The round flat washer according to the invention of claim 4 is a shape in which the washer of claims 1 to 3 is composed of an outer ring and an inner ring, and the rigidity and the washer are fastened by changing their area and hardness. It is characterized by changing.

  The round flat washer according to the invention of claim 5 makes it possible to further extract the features of the washer of claim 4. For example, when the outer ring is made of a titanium alloy and the inner ring is made of brass, the clearance between the inner ring and the bolt shaft portion can be further reduced by utilizing the fact that the deformation amount of the metal in the crimped state is different. In the case of this example, it is assumed that brass is crimped and deformed to some extent in the fastening state, and after forming a stronger integrated state of the fastening object, the loosening due to the damping effect and its repulsion effect using the characteristics of the titanium alloy Stop ability can also be expected.

  When the round plain washer is used for the seating surface of the fastening part of the cylinder and cylinder head of the internal combustion engine, it can realize an even and firm fastening state without stress due to a good alignment state, and vibration generated from the inside of the internal combustion engine Can be relaxed. As a result, it is possible to expect a longer life of components of the internal combustion engine and a reduction in fuel consumption due to a better operating state.

  When the round flat washer is used for the seating surface of the fastening part between the engine and the body of a two-wheeled vehicle, a uniform and firm fastening state without stress due to a good alignment state can be realized, and vibration from the engine is transmitted to the body. Can be relaxed. Furthermore, when the metal used for the outer ring and the inner ring is changed, a change is seen in the way the vibration is transmitted. By contriving these combinations, it is possible to construct a fastening state that matches the purpose.

1A and 1B are a front sectional view and a top view of a round flat washer according to the invention of claim 1. FIG. 2 is a cross-sectional view showing an embodiment of a fastening structure using a round flat washer according to the invention of claim 3. Originally, the object to be fastened, the washer, and the seating surface of the nut are in contact with each other, but here, for the sake of clarity, the drawing is made with a slight gap. FIG. 3 is an enlarged view of a portion surrounded by a broken line in FIG. FIG. 4 is a cross-sectional view showing an embodiment of a fastening structure using a round flat washer according to the invention of claim 2. Originally, the object to be fastened, the washer, and the seating surface of the head of the bolt are in contact with each other, but here, for the sake of easy understanding, the drawing is made with a slight gap. FIG. 5 is an enlarged view of a portion surrounded by a broken line in FIG. FIG. 6 is a sectional view showing an embodiment of a fastening structure using a round flat washer according to the invention of claim 4. Originally, the object to be fastened, the washer, and the seating surface of the head of the bolt are in contact with each other, but here, for the sake of easy understanding, the drawing is made with a slight gap. FIG. 7 is an enlarged view of a portion surrounded by a broken line in FIG. FIG. 8 is an enlarged cross-sectional view showing an embodiment of a fastening structure using a round flat washer according to the invention of claim 1. Originally, the object to be fastened, the washer, and the seating surface of the nut are in contact with each other, but here, for the sake of clarity, the drawing is made with a slight gap.

  In FIG. 1, a round flat washer 1 is formed of an inner ring portion 3 having an inclined portion and a flat outer ring portion 2. The second inclined portion 5 of the inner ring portion has a shape along the chamfered portion 17 of the other fastened object 7 shown in FIG. 5, while the first inclined portion 4 has a head 14 of the bolt 13 shown in FIG. A shape along a corner R16 provided at a portion intersecting with the shaft portion 15 or a shape allowing the corner R16 to escape is used.

  FIG. 3 is a partially enlarged view of a round flat washer 8 according to another embodiment, and shows a state of the chamfered portion 11 of the second inclined portion 5 and the flanged nut 9 provided on the round flat washer 8. Accordingly, when the flanged nut 9 is tightened, the axis of the flanged nut 9 is aligned with the center of the round flat washer 8 along the chamfered portion 11 of the flanged nut 9. Thereby, the said all alignment can form the fastening state with favorable.

  FIG. 8 is a partially enlarged view of a round flat washer 18 according to another embodiment. The round flat washer 18 includes a surface that is in contact with the flanged nut 9 and a surface that is in contact with the other fastened object 7. Both have an inclined portion, and the shape thereof conforms to the second inclined portion 5. Thus, when the flanged nut 9 is tightened, the second inclined portion 5 on the side that comes into contact with the nut moves along the chamfered portion 11 of the nut with the shaft center of the flanged nut 9 and the center of the round flat washer 18. Match. On the other hand, the second inclined portion 5 on the side of the washer that is in contact with the fastening object is along the chamfered portion 17 provided on the other fastening object 7, so that the center of the round flat washer 18 and the other workpiece are connected. The centers of the through holes of the fastener 7 coincide. Thereby, the said all alignment can form the fastening state with favorable.

  FIG. 5 shows the state of the first inclined portion 4 and the second inclined portion 5 provided on the round flat washer 12, and the corner R16 provided at the portion where the head portion 14 and the shaft portion 15 of the hexagon socket head bolt 13 intersect. Indicates. Accordingly, when the hexagon socket head cap screw 13 is tightened, the second inclined portion 5 extends along the chamfered portion 17 provided in the other fastening object 7 and the center of the through hole of the other fastening object 7 and the round flat washer. The center of 12 coincides. On the other hand, a corner R16 provided on the bolt is guided along the first inclined portion 4 of the plain washer so that the center of the bolt and the washer coincide. Thereby, all the alignment can form the fastening state with favorable.

  The effect of the round flat washer 1 will be described with reference to FIG. The shape is the same as that of the round flat washer 12 of FIG. 5, but is composed of the outer ring 2 and the inner ring 3 shown in FIG. The outer and inner rings 2 and 3 are separate parts, but each part is integrated by press-fitting or bonding. The first inclined portion 4 or the second inclined portion 5 provided on the inner ring 3 is shaped along the chamfered portion 17 of the object to be fastened or the corner R16 of the bolt as described above. To do. For example, when the washer is made of an aluminum alloy, the outer ring 2 is made of a high strength material such as JIS A7075, and the inner ring 3 is made of a low strength material such as JIS A5052, so that the inner ring 3 is deformed by crimping in a fastened state. By doing so, the tolerance can be relaxed, and a stronger fastening state can be formed.

  As described above, in the round flat washer 1, metals having different strengths are used for the outer ring 2 and the inner ring 3, but depending on the place and purpose of use, the outer ring 2 is made of titanium alloy and the inner ring 3 is made of brass. It is also conceivable to combine a combination of a metal having a heat resistant resin as the inner ring 3 and a material other than a metal. Furthermore, an appropriate shape can be constructed by changing the ratio of the area of the outer ring 2 and the inner ring 3, the thickness of the washer, and the like.

  The round flat washer 1 having a hybrid structure in which different metals or other metals are combined has a different number of resonances depending on the material used. Therefore, it is a very effective means for damping or adjusting vibration. It becomes.

DESCRIPTION OF SYMBOLS 1 Round flat washer 2 Outer ring 3 of the said round flat washer 3 Inner ring 4 of the said round flat washer The 1st inclination part 5 provided in the hole of the said round flat washer 5th provided in the hole of the said round flat washer Two inclined portions 6 One fastened object 7 The other fastened object 8 Round flat washer 9 according to another embodiment Nut with flange 10 Stud bolt 11 Chamfered portion 12 on the seat surface of the nut with flange According to another embodiment Round flat washer 13 Hexagon socket head cap bolt 14 Head portion of the hexagon socket head bolt 15 Shaft portion 16 of the hexagon socket head cap bolt Provided at a portion where the head portion 14 of the hexagon socket head bolt and the shaft portion 15 intersect. Corner R
17 Chamfer 18 provided on the other object to be fastened 18 Round flat washer according to another embodiment

Claims (6)

  A round flat washer characterized in that a portion where the fastening surface of the round flat washer and the through hole intersect is inclined in the axial direction of the bolt, and the inclined portion is shaped along the chamfered portion of the object to be fastened.   The shape of the round flat washer according to claim 1 that is in contact with the head of the bolt along the corner R provided at a portion where the head of the bolt intersects the shaft, or the shape that allows the corner R to escape. A round flat washer characterized by   The round flat washer according to claim 1, wherein the round flat washer has a sloped portion having a shape along a chamfered portion of the nut on a side in contact with the nut.   4. The round flat washer according to claim 1, wherein the round flat washer comprises an outer ring and an inner ring, and the hardness of the outer and inner rings is different.   The round flat washer according to claim 4, wherein the outer ring and the inner ring are made of different metals.   5. A round flat washer according to claim 4, wherein the outer ring is replaced with a metal and the inner ring is replaced with an object other than metal (for example, a heat-resistant resin).

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