JP2023173632A - nut - Google Patents

Abstract

To provide a nut which can stably supply a lubricant to a slide part between a nut body and a washer.SOLUTION: A nut 7 includes: a nut body 11 having a female screw part 13 on an inner surface; and a washer 10 which is disposed at an outer part of one end of the nut body 11 so as to be rotatable relative to the nut body 11. The nut body 11 has a grease supply part 20 which guides a lubricant from the female screw part 13 side to a slide part between the nut body 11 and the washer 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a nut including a nut body and a washer rotatably arranged with respect to the nut body.

2. Description of the Related Art Conventionally, a fastening section including bolts and nuts has been used as an attachment section for attaching a brake and a disc wheel of a wheel to a hub of a large truck or bus, or as an attachment section for attaching a disc wheel of a wheel to a hub.

In recent years, in order to prevent damage to the seat surface of the disc wheel and to obtain sufficient axial force, nuts with a built-in washer, in which a separate washer is rotatably caulked to the nut body, have been used as nuts. It will be done. In the case of this nut with a built-in washer, the parts that slide during tightening are the threaded surface between the male threaded portion and the female threaded portion, and the sliding surface between the nut body and the washer. For the reliability of the fastening section, it is important to stably secure the necessary fastening force. Therefore, in the case of a lubricated tightening specification, it is essential to apply a sufficient amount of lubricant to the threaded surface and sliding surface.

For example, there are known nuts in which a sliding surface between a nut body and a washer is formed with grooves or depressions that can hold lubricant (for example, see Patent Documents 1 and 2).

Utility Model Publication No. 5-79029 Utility Model Publication No. 6-18720

In the case of the nut with a built-in washer as described above, the nut body and the washer are integrally attached by a caulking structure. Because the gap between the nut body and the washer is small, it is often difficult to stably supply lubricant to the sliding surface, and it is also difficult to directly apply lubricant to the sliding surface with a small gap. This is complicated, and the application of lubricant to the sliding surface tends to be omitted. In the case of this type of nut structure with a built-in washer, the seating area is smaller than that of a normal nut, and it slides under high surface pressure, so if lubricant is not properly supplied to the sliding surface, galling etc. The risk of occurrence increases.

The present invention has been made in view of these points, and an object of the present invention is to provide a nut that can stably supply lubricant to the sliding portion between the nut body and the washer.

The nut according to claim 1 includes a nut main body having a female thread on the inner surface, and a washer rotatably arranged with respect to the nut main body on the outer side of one end of the nut main body. The lubricant has a lubricant supply portion that guides lubricant from the female thread portion side to the sliding portion between the nut body and the washer.

A second aspect of the present invention provides a nut according to the first aspect, in which the greasing portion is a hole that penetrates the nut body from the inner surface to the outer surface.

According to a third aspect of the present invention, in the nut according to the first aspect, the lubricating portion is a groove portion formed in one end portion of the nut body from the inner surface to the outer portion.

A fourth aspect of the present invention provides a nut according to any one of claims 1 to 3, in which a plurality of greasing portions are equally distributed in the circumferential direction of the nut body.

According to the present invention, the lubricant can be stably supplied to the sliding portion between the nut body and the washer by the lubricant supply portion.

(a) is a cross-sectional view of the nut according to the first embodiment, and (b) is a cross-sectional view of the nut main body of the same nut. It is a perspective view of the nut same as the above. It is a sectional view showing the usage state of the nut same as the above. (a) is a sectional view of a nut according to a second embodiment, and (b) is a sectional view of a nut body of the same nut.

A first embodiment of the present invention will be described with reference to the drawings.

FIG. 3 shows an example of a wheel support structure 1 for a vehicle. The wheel support structure 1 fixes a brake drum 3 and a disc wheel 4, which are objects to be supported, to a hub 2, which is a support part fixed to an axle, for example. The present invention is not limited to this, and the disc wheel 4 may be fixed to the hub 2 in a vehicle using a disc brake. In this embodiment, examples of the vehicle include a large truck with a total vehicle weight of approximately 11 tons or more, or a large vehicle (large commercial vehicle) such as a bus with a capacity of 30 or more people. In the illustrated example, the wheel support structure 1 is applied to the rear wheel of the vehicle, and the rear wheel has two disc wheels 4 arranged in parallel in the vehicle width direction (left and right direction in FIG. 3). , shows a so-called double tire, in which two tires of the same size are used for each wheel. The present invention is not limited to this, and the wheel support structure 1 may be applied to a single tire wheel, or may be applied to any wheel such as a front wheel, not just a rear wheel.

The wheel support structure 1 includes a bolt 6 and a nut 7. The bolts 6 are wheel bolts that protrude outward from the side surface of the brake drum 3 and are arranged in plurality, for example eight or ten, at equal pitches in the circumferential direction. The bolt 6 is fitted into a fitting hole formed in the hub 2, inserted into a through hole formed in the brake drum 3 and the disc wheel 4, and a nut 7 is screwed into a male threaded portion 8 at the tip thereof. It is then tightened to a predetermined torque using a tool such as a torque wrench to secure it in place. As an example, the bolt 6 has a thread size of M22×1.5.

Nut 7 is called a wheel nut. As shown in FIGS. 1A and 3, the nut 7 includes a washer 10 and a nut body 11. In the nut 7, a separate washer 10 is rotatably disposed on the outer side of one end of the nut body 11. In the illustrated example, the nut 7 is a washer-integrated nut in which a separate washer 10 is rotatably integrally assembled to the outer side of one end of the nut body 11.

The washer 10 is installed on a planar installation surface, in this embodiment, the side surface 4a of the disc wheel 4, and serves to disperse the bearing surface pressure of the nut body 11. The washer 10 is formed into a flat washer shape having a larger outer diameter than the nut body 11. That is, the washer 10 is formed in an annular shape with an open center. The washer 10 has an outer surface 10a and an inner surface 10b each having a circular shape, and has a cylindrical shape extending in the axial direction. The inner surface 10b has an enlarged diameter at one end. The washer 10 also has a seat surface 10c at one end that faces the side surface 4a and is in close contact with the side surface 4a. The seat surface 10c has a planar shape extending in the direction perpendicular to the axis, and has an outer edge connected to the outer surface 10a and an inner edge connected to the inner surface 10b. Further, the washer 10 has a sliding surface 10d, which is a facing surface facing the nut body 11 in the axial direction, at the other end, which is the end opposite to the seat surface 10c. The sliding surface 10d may be flat along the direction perpendicular to the axis of the washer 10, or may be inclined with respect to the direction perpendicular to the axis. In this embodiment, the sliding surface 10d is formed in the shape of an inclined surface that is inclined at a predetermined angle, for example, 15 degrees, toward the other end (the upper side shown in FIG. 1(a)) with respect to the axis-perpendicular direction. Furthermore, the sliding surface 10d has an inner edge connected to the inner surface 10b, and an outer edge connected to the end surface 10e. The outer edge of the end surface 10e is continuous with the outer surface 10a. In the illustrated example, the end surface 10e is formed in the shape of an inclined surface that is inclined toward one end portion (lower side shown in FIG. 1(a)) with respect to the axis-perpendicular direction. The end surface 10e is located on the outside of the nut body 11 and is a surface that does not face the nut body 11 in the axial direction.

The nut body 11 is formed into a cylindrical shape and has a female threaded portion 13 on its inner surface that is screwed into the male threaded portion 8 of the bolt 6 . The nut body 11 has a nut head 15 adjacent to the washer 10 . The nut head 15 is a portion exposed to the washer 10 when the nut 7 is screwed onto the bolt 6. As shown in FIG. 2, the outer surface 15a of the nut head 15 has a hexagonal shape. In this embodiment, the outer surface 15a has a hexagonal shape that is inscribed or substantially inscribed in the outer shape of the sliding surface 10d of the washer 10. Further, one end portion of the nut head 15 is a sliding surface 15b that is an opposing surface that faces the sliding surface 10d of the washer 10 in the axial direction. The sliding surface 15b may be planar along the direction perpendicular to the axis of the nut body 11, or may be inclined with respect to the direction perpendicular to the axis. In this embodiment, the sliding surface 15b is inclined at a predetermined angle, for example, 15 degrees, toward the other end (the upper side shown in FIG. 1(a)) with respect to the direction perpendicular to the axis of the nut body 11. The outer edge of the sliding surface 15b is continuous with the outer surface 15a. The sliding surface 15b and the sliding surface 10d form a sliding portion that slides against each other when one of the washer 10 and the nut body 11 rotates relative to the other.

An insert portion 17 that is inserted into the washer 10 extends from one end of the nut head 15 . The nut body 11 is integrally assembled to the washer 10 by deforming the inner insertion part 17 by caulking or the like so that the diameter thereof is slightly expanded toward one end.

The inner insertion portion 17 is formed to have a smaller external shape than the nut head 15. The inner insertion part 17 is formed in a cylindrical shape coaxial or substantially coaxial with the nut head 15. The insertion portion 17 is shorter than the axial length of the washer 10 and is arranged so as not to protrude from one end of the washer 10. The outer surface 17a of the inner insertion portion 17 faces the inner surface 10b of the washer 10 in the radial direction. The outer surface 17a of the inner insertion portion 17 is continuous with the inner edge of the sliding surface 15b of the nut head 15. The inner surface 17b of the insertion portion 17 forms a continuous surface with the inner surface 15b of the nut head 15.

A greasing portion 20 is formed in the nut body 11. The greasing portion 20 is an oil passage that guides lubricant from the female threaded portion 13 side to the sliding portion between the nut body 11 and the washer 10, that is, between the sliding surface 15b and the sliding surface 10d. The greasing portion 20 is formed to extend in the radial direction from the inside to the outside of the nut main body 11 . In this embodiment, the greasing portion 20 is a small-diameter hole that penetrates the nut body 11 from the inner surface to the outer surface. In the illustrated example, the greasing portion 20 is formed to penetrate the inner insertion portion 17 in the radial direction. For example, the greasing portion 20 is formed by cutting the nut body 11 with a tool such as a drill or by electrical discharge machining. That is, the greasing portion 20 of this embodiment is formed in a separate process after the outer shape of the nut body 11 is molded using a mold.

The greasing part 20 is located close to a position where an opening 20a, which is an end opened in the outer surface 17a on the outer side of the nut body 11, is connected to the other end of the inner insertion part 17, that is, the nut head 15. located. That is, the opening 20a is located facing the sliding surface 15b or close to the sliding surface 15b. In the illustrated example, the opening 20a is located opposite the inner surface 10b of the washer 10.

Preferably, the opening 20b, which is the end of the inner surface of the nut body 11, which is opened at the female threaded section 13 in this embodiment, of the greasing section 20 has a size of, for example, about 1 pitch to 2 pitches. It is formed. As an example, the opening 20b is formed to have a diameter of about 1 mm to 3 mm. The area of the opening 20b may be equal to or larger than the opening 20a. Further, in the illustrated example, the greasing portion 20 is formed in the nut body 11 in a straight line extending in the direction perpendicular to the axis, but is not limited to this, and may be formed at an angle with respect to the direction perpendicular to the axis. Good too.

In this embodiment, as shown in FIG. 1(b), a plurality of greasing portions 20 are equally distributed in the circumferential direction of the nut body 11. In the illustrated example, four greasing portions 20 are formed and are equally spaced at 90 degrees in the circumferential direction of the nut body 11.

The nut 7 is first formed by separately molding the washer 10 and the nut body 11. In this embodiment, the nut main body 11 is formed into a hexagonal cylindrical shape to form the greasing portion 20 . After this, the inner insertion part 17 of the nut body 11 is inserted into the washer 10, and the inner insertion part 17 is caulked and deformed to integrally assemble the washer 10 and the nut body 11. Form.

The completed nut 7 has the female threaded portion 13 coated with lubricant, is fitted into the fitting hole of the hub 2, is inserted into the through holes of the brake drum 3 and the disc wheel 4, and is the male threaded portion of the bolt 6 coated with lubricant. 8, and tighten and fix the nut body 11 with a tool such as a torque wrench.

At this time, according to the present embodiment, since the lubricating part 20 is formed in the nut body 11, the fluid lubricant applied to the male threaded part 8 of the bolt 6 is applied to the screwed-in part of the nut body 11 of the nut 7. Accordingly, it is guided to the sliding part between the nut body 11 and the washer 10 via the greasing part 20. That is, before the nut 7 is tightened and fixed to the bolt 6, a slight gap is formed between the washer 10 and the nut body 11 in the stage before the washer 10 and the nut body 11 are rotatable with respect to each other. Taking advantage of this fact, the lubricant applied to the male threaded portion 8 of the bolt 6 is guided into this gap by the greasing portion 20. As a result, it is possible to simply apply lubricant to the exposed female threaded portion 13 and the male threaded portion 8 of the bolt 6, where it is easy to apply lubricant, and then tighten the nut 7, but it is difficult to apply lubricant directly from the outside of the nut. The lubricant can be stably supplied between the sliding surfaces 15b and 10d, which are the sliding parts of the main body 11 and the washer 10.

In particular, in the case of large vehicles with many large tires, several dozen nuts 7 are attached to each vehicle, so lubricant is applied from the outside of the nut body 11 to the sliding part between the nut body 11 and the washer 10. The lubricant can be applied to the sliding parts by simply applying lubricant to the female threaded part 13 and the male threaded part 8 of the bolt 6 and screwing in the nut 7, without the need for complicated operations such as applying lubricant. By being able to apply it, the nut 7 can be installed in a short time.

Furthermore, by making the greasing portion 20 a hole that penetrates the nut body 11 from the inner surface to the outer surface, the mold for molding the nut body 11 can be changed from a conventional mold or processed. It becomes possible to form the greasing portion 20 in a post-process by using it as is. Therefore, the manufacturing cost of the nut 7 can be suppressed.

Since a plurality of greasing parts 20 are equally distributed in the circumferential direction of the nut body 11, the lubricant can be evenly distributed from the plurality of greasing parts 20 to the sliding part between the nut body 11 and the washer 10. .

Therefore, it is possible to supplement the lubrication of the sliding part between the nut body 11 and the washer 10 and to stably secure the necessary fastening force, which is particularly effective in preventing the vehicle from falling off due to the nut 7 falling off. big.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the nut 7 of the second embodiment, the greasing section 20 is a groove formed in one end of the nut body 11 from the inner surface to the outer surface. The greasing portion 20 is formed by cutting out one end portion (the lower end portion in FIG. 4(a)) of the nut body 11. The greasing portion 20 is recessed in the axial direction and extends in the radial direction.

For example, the greasing portion 20 is formed by a mold of the nut body 11. That is, the mold for the nut body 11 is provided with a protrusion for forming the greasing portion 20 in advance.

In this embodiment, the depth of the greasing section 20 extends over the axial length of the inserting section 17 . Therefore, the inserting section 17 is divided into a plurality of inserting pieces 21 in the circumferential direction by the greasing section 20 .

Further, one or more greasing portions 20 are formed in the circumferential direction of the nut body 11 . Preferably, as shown in FIG. 4(b), three or more greasing portions 20 are formed. In the illustrated example, three greasing portions 20 are formed and are equally spaced at 120 degrees in the circumferential direction of the nut body 11.

The other configuration of the nut 7 according to the second embodiment is basically the same as the first embodiment.

The nut 7 is first formed by separately molding the washer 10 and the nut body 11. In this embodiment, the nut body 11 is formed with a greasing portion 20 during molding. After this, the inner insertion part 17 of the nut body 11 is inserted into the washer 10, and the inner insertion part 17 is caulked and deformed to integrally assemble the washer 10 and the nut body 11. Form.

The completed nut 7 has the female threaded portion 13 coated with lubricant, is fitted into the fitting hole of the hub 2, is inserted into the through holes of the brake drum 3 and the disc wheel 4, and is the male threaded portion of the bolt 6 coated with lubricant. 8, and tighten and fix the nut body 11 with a tool such as a torque wrench.

At this time, according to the present embodiment, the nut body 11 has the same structure as the first embodiment, such as forming the lubricating part 20, so that the female thread part 13 and the lubricant can be easily applied. By simply applying lubricant to the male threaded portion 8 of the bolt 6 and tightening the nut 7, the lubricant can be stably applied to the sliding part between the nut body 11 and the washer 10, which is difficult to directly apply lubricant from the outside. It is possible to achieve the same effects as in the first embodiment, such as being able to supply the same amount of water.

Furthermore, by forming the greasing part 20 as a groove formed in one end of the nut body 11 from the inner surface to the outer part, the greasing part 20 can be formed by the mold for molding the nut body 11 when the nut body 11 is molded. 20 can be molded. Therefore, a separate process for forming the greasing portion 20 is not necessary, and the nut 7 can be formed in a short time and with high precision.

Furthermore, since a plurality of greasing parts 20 are equally distributed in the circumferential direction of the nut body 11, the lubricant can be evenly distributed from the plurality of greasing parts 20 to the sliding part between the nut body 11 and the washer 10. I can do it. Moreover, by forming three or more greasing parts 20 in the circumferential direction of the nut main body 11, the cylindrical inner insertion part 17 is divided into three or more inner insertion pieces 21 by the greasing parts 20. Therefore, when assembling the nut body 11 to the washer 10, when caulking the inner insertion part 17 so that the diameter is slightly expanded toward one end, the inner insertion part 17 is more difficult to swage than when the number of the inner insertion pieces 21 is two or less. Since the insert piece 21 can be easily expanded in the radial direction, the nut body 11 and the washer 10 can be easily assembled.

7 Nut 10 Washer 11 Nut body 13 Female thread part 20 Greasing part

The nut according to claim 1 includes a nut head having a facing surface at one end, an insert portion protruding from one end of the nut head, and an inner surface formed between the nut head and the insert portion . a nut main body having a female threaded portion ; a sliding surface axially opposed to the opposing surface; and an inner surface radially opposed to the inner insertion portion inserted therein; A washer is provided on the outer side of one end of the nut body and is rotatably arranged with respect to the nut body. The lubricant is provided with a lubricant supply portion that guides lubricant from the side to a sliding portion between the nut body and the washer, including at least the opposing surface and the sliding surface .

6 bolts 7 nuts
8 male thread part
10 Washer
10b inner surface
10d sliding surface
11 Nut body 13 Female thread part
15 nut head
Sliding surface that is the opposing surface of 15b
17 interpolation part
20 Greasing part

Claims (4)

a nut body having a female thread on the inner surface;
a washer rotatably arranged with respect to the nut body on the outer side of one end of the nut body,
The nut body is characterized in that the nut body has a lubricant supply portion that guides lubricant from the female thread portion side to a sliding portion between the nut body and the washer. The nut according to claim 1, wherein the greasing portion is a hole penetrating the nut body from the inner surface to the outer surface. The nut according to claim 1, wherein the greasing portion is a groove formed in one end of the nut body from the inner surface to the outer surface. The nut according to any one of claims 1 to 3, wherein a plurality of greasing portions are equally distributed in the circumferential direction of the nut body.

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