JP2011133033A - Rotation stopper structure for fastening member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide rotation stopper structure for a fastening member not using a special tool or the like, not requiring working at high precision, applicable irrespective of the shape of a nut or a bolt, and capable of working easily bearing surfaces of a nut or bolt head part and an upper face of a rotation stopper. <P>SOLUTION: This rotation stopper structure includes a support member 10, a coupling objective member 20, fastening members 7, 8 comprising the bolt 7 inserted into respective bolt holes of the support member 10 and the coupling objective member 20, and the nut 8 screwed into the bolt 7, and for fastening the support member 10 and the coupling objective member 20, and the block-shaped rotation stopper 30 welded to the support member 10 to correspond to the nut 8 or a position of the bolt 7 head part at the time when fastening the support member 10 and the coupling objective member 20, and for abutting on the nut 8 or the bolt 7 head part to regulate rotation, and an angled part formed by an abutting face 30a on the nut 8 or the bolt 7 head part and a welded face 30b of the support member 10 is chamfered in the rotation stopper 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fastening member detent structure for restricting rotation of a nut or a head portion of a bolt when two members are fastened by a fastening member including a bolt and a nut.

  In general, when two members are fastened by using a fastening member composed of a bolt and a nut, a supporting member (hereinafter simply referred to as a supporting member) and a member to be fastened to the supporting member (hereinafter referred to as a coupling target) Bolt holes are formed in each of the bolt holes, and the bolts are passed from one side of the bolt holes to the bolt holes in a state where the two members are joined, and at the tip of the bolt protruding from the other side of the bolt holes. The nut is temporarily fixed, one of the bolt and the nut is fixed with a tool or the like, and the other is rotated with a tool or the like to fasten the support member and the member to be coupled.

At this time, a wrench or spanner, which is a general fastening tool, is often used as a fixing tool, but the members are fastened with bolts and nuts in a narrow space where such a tool cannot be used. When doing so, what is called a detent may be used in order to control rotation of the head of a nut or a bolt (refer to patent documents 1).
The detent described in Patent Document 1 is formed integrally with a support member formed as a cast product. For example, in the case where the support member has a structure in which sheet metal is bonded by welding or the like, the detent is not supported with the support member. Cannot be formed integrally with each other, and therefore, another part called a detent may be welded to the support member.

Here, FIG. 6 shows an example in which the member is fastened by using the rotation stopper welded to the support member. When the member to be coupled is fastened to the support member, as shown in FIG. 6, bolt holes (not shown) are formed in the support member 60 and the member to be coupled 70, and the bolt 7 is inserted from the member to be coupled 70 side. 7 protrudes toward the support member 60 side.
The detent 80 has a block shape, and its lower surface 80d has a side closer to the support member 60 (hereinafter referred to as a welded portion 90) fixed in advance to the side surface 60b of the support member 60 by welding. The nut 8 is screwed and fastened to the front end portion of the bolt 7 from the support member 60 side. When fastening, the upper surface (hereinafter referred to as the rotation stopper 80) fixed to the support member 60 on the flat side surface 8b of the nut 8 in advance. 80a abuts, thereby restricting rotation of the nut 8.

  In addition to using such a detent in place of the tool as described above, in order to prevent loosening of the bolt and nut in a fastening portion having a strong axial force, the detent may be fixed in advance.

Japanese Patent Laid-Open No. 10-324125

  By the way, as described above, the rotation stopper is fixed to the positioning at the time of welding of the rotation stopper because the side surface of the nut or the head of the bolt head comes into contact with the upper surface to restrict the rotation of the nut or bolt head. The above accuracy is required. However, since the rotation stopper is fixed by welding, it is difficult to attach it with high accuracy. Therefore, in order to suppress to an appropriate dimensional tolerance, it is necessary to process the upper surface of the detent that comes into contact with the side surface of the nut or the side surface of the bolt head after the detent is fixed by welding. Further, on the side surface of the support member, there may be a case where processing for reducing the surface roughness of the surface of the nut or the head of the bolt that comes into contact with the bottom of the nut or the head of the bolt is required. . These processes are performed by the following two methods.

  In the first method, as shown in FIGS. 7A and 7B, the support member 60 that becomes the seat surface 61 of the head 7a of the nut 8 or the bolt 7 and the contact surface 80a of the detent 80 are simultaneously formed. It is a method of processing. In this case, a special tool or a processing machine that can perform simultaneous processing is required. Further, as shown in FIG. 7B, the seat surface 61 is curved toward an edge portion (hereinafter referred to as a peripheral portion) 61a between the side surface 60b and the seat surface 61, so that the bottom surface of the nut 8 is provided. It can be applied only to the case where the bottom surface 7d of the head 7a of the bolt 7 or the bolt 7 is chamfered to a certain extent or more.

  In the second method, as shown in FIGS. 8A and 8B, the support member 60 that becomes the seat surface 61 of the head 7 a of the nut 8 or the bolt 7 and the contact surface 80 a of the detent 80 are separately provided. It is a method to process. In the example shown in FIG. 8, first, the support member 60 that becomes the seat surface 61 is processed, and then the contact surface 80 a of the rotation stopper 80 is processed, but the processing order may be reversed.

  Thus, when processing separately the supporting member 60 used as the seating surface 61 of the head 7a of the nut 8 or the bolt 7, and the contact surface 80a of the detent 80, up to the surface processed previously at the time of subsequent processing. The tool feed amount with respect to the bolt axis direction must be controlled with high accuracy so as not to process, and machining is difficult. Further, as shown in FIG. 8 (b), when machining the contact surface 80a of the detent 80, the feed amount of the tool with respect to the bolt axis direction so as not to process excessively to the portion of the seat surface 61 previously processed. As a result, the entire upper surface 80a of the rotation stopper 80 may not be processed, and the corner portion 80f on the support member 60 side may remain.

  Further, as shown in FIG. 8B, the seat surface 61 is curved toward the peripheral edge portion 61a, and the corner portion 80f on the support member 60 side also remains, so that the bottom surface 8d of the nut 8 or the bolt It can be applied only to the case where the bottom surface 7d of the 7 head 7a is chamfered with a size larger than that applied in the first method.

  The present invention has been devised in view of such problems, and can be applied regardless of the shape of the nut or bolt without using a special tool or the like and without requiring high-precision processing. An object of the present invention is to provide a detent structure for a fastening member that can easily process the seating surface of the bolt head and the upper surface of the detent.

  In order to solve the above-described problems, the fastening member detent structure according to the present invention includes a support member having a bolt hole, a coupling target member having a bolt hole and coupled to the support member, the support member, and the support member. A fastening member for fastening the support member and the member to be joined, a bolt that is inserted into each bolt hole with the member to be joined, and a nut that is screwed into the bolt; the support member and the member to be joined; A block-shaped detent that is welded to the support member corresponding to the position of the head of the nut or the bolt when the nut is fastened, and that restricts rotation by contacting the nut or the head of the bolt; The rotation stopper is chamfered at a corner between a contact surface with the nut or the head of the bolt and a welding surface with the support member.

The contact surface is preferably subjected to a surface treatment for setting the contact surface at a specified position and reducing the surface roughness of the contact surface.
Moreover, it is preferable that the said supporting member is a welded structure product which superposed | polymerized the several metal plate and adhere | attached it by welding.

  According to the anti-rotation structure for the fastening member of the present invention, a predetermined gap is formed from the processed end of the upper surface of the anti-rotation (hereinafter also referred to as a contact surface) to the seating surface of the support member. Even when the tool feed amount with respect to the bolt axis direction is not managed with high accuracy during machining, there is no risk of machining the support member to which the detent is welded. Can be easily processed separately. Therefore, there is no need for special tools and processing machines that can be processed at the same time, processing with general tools and machine tools is possible, and costs can be reduced.

In addition, since a predetermined gap is created from the processing end of the upper surface (contact surface) of the rotation stopper to the seating surface of the support member, it is not affected by the curved surface to the peripheral edge of the seating surface, so the shape of the nut or bolt Can be applied regardless.
Further, when the support member is a welded structure product, the rotation stopper cannot be integrally formed, and therefore the rotation prevention structure of the present invention is more preferable.

It is principal part sectional drawing explaining the rotation prevention structure of the fastening member concerning 1st Embodiment of this invention, (a) is XX arrow sectional drawing in FIG. 4, (b) is FIG. It is an A section enlarged view. It is a principal part top view of the attachment structure of the V-rod in the large sized truck to which the detent | locking structure of the fastening member concerning 1st and 2nd embodiment of this invention is applied. It is a principal part perspective view of the axle side attachment structure of the V-rod in the large truck to which the detent | locking structure of the fastening member concerning 1st and 2nd embodiment of this invention is applied. FIG. 4 is a plan view of FIG. 3, and is an enlarged view of a W portion in FIG. 2. It is principal part sectional drawing explaining the rotation prevention structure of the fastening member concerning 2nd Embodiment of this invention, (a) is XX arrow sectional drawing in FIG. 4, (b) is FIG. 5 (a). It is a B section enlarged view. It is a perspective view explaining an example which used a rotation stop at the time of fastening with a supporting member and a member for connection. It is a figure explaining the conventional subject at the time of processing the upper surface of a rotation stopper, and a seat surface simultaneously, (a) is the sectional view, and (b) is the C section enlarged view of Drawing 7 (a). It is a figure explaining the conventional subject at the time of processing the upper surface and seating surface of a rotation stopper separately, (a) is the sectional view, and (b) is the D section enlarged view of Drawing 8 (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, although both 1st and 2nd embodiment mentioned later demonstrates the example applied to the attachment part of the V rod in a large sized truck, the part to which this invention is applied is not limited to this, When the two members are fastened by using a fastening member composed of a bolt and a nut, it is only necessary to use a detent.

[First Embodiment]
A detent structure for a fastening member according to a first embodiment of the present invention will be described with reference to FIGS. In addition, this embodiment is a detent | locking structure applied to what the bottom face of a nut is chamfered.
1 (a) and 1 (b) are cross-sectional views of a main part for explaining a structure for preventing rotation of a fastening member according to the present embodiment, and FIG. FIG. 3 is a perspective view of a main part of a V rod axle side mounting structure in a large truck to which the present invention is applied, and FIG. 4 is a plan view of FIG. 3 (an enlarged view of a W portion in FIG. 2).

As shown in FIG. 2, the large truck to which the anti-rotation structure of the fastening member according to the present embodiment is applied has both end portions of the axle housing 3 disposed in the vehicle width direction between the pair of left and right side frames 2 and 2. Two tires 1 are attached to each. A V rod 4 is provided between the axle housing 3 and the pair of left and right side frames 2 and 2.
The base 4a of the V rod 4 is attached to the axle housing 3 to constitute the axle side attaching portion 6, and both end portions 4b and 4b of the V rod 4 are attached to the pair of left and right side frames 2 and 2 to the frame side. A mounting portion 5 is configured. The V rod 4 is provided so as to be expanded outwardly from the axle side attachment portion 6 (base portion 4a) in a V-shape, and suppresses shaking in the vehicle width direction. In FIG. 2, the left side is the front side of the vehicle.

3 and 4 are enlarged views of the axle side attachment portion 6 in FIG. 2, FIG. 3 is a perspective view thereof, and FIG. 4 is a plan view thereof.
As shown in FIGS. 3 and 4, the axle side mounting portion 6 can swing a cylindrical outer cylinder 4 c fixed to the base 4 a of the V rod 4 and a central portion (not shown) to the outer cylinder 4 c. And a shaft member (member to be coupled) 20 having a bolt hole 20e through which a plurality of (four in this example) bolts 7 are inserted on both sides, and a plurality of bolts 7 formed in the vehicle width direction. And a bracket (support member) 10 including a base portion (not shown) that is connected to the lower portion of the V rod support portion 10s and is fixed to the axle housing 3.

A rubber (elastic body such as rubber) 9 is interposed between the inner surface of the cylindrical outer cylinder 4 c and the outer surface of the central portion of the shaft member 20, and the rubber 9 is baked on the outer surface of the central portion of the shaft member 20. Thus, the outer cylinder 4 c of the V rod 4 and the shaft member 20 are connected via the rubber 9.
In this embodiment, the bracket 10 is configured as a welded structure product in which a plurality (three in this example) of sheet metals are polymerized and bonded together by welding. As a result, the bracket 10 having high rigidity and high strength is formed using the sheet metal. A plurality of bolt holes 10e are drilled in the V rod support portion 10s of the bracket 10 in the same manner as the shaft member 20, and bolts 7 are inserted into these bolt holes 10e, 20e, and nuts 8 are screwed together. Thus, the bracket 10 and the shaft member 20 are fastened. In addition, the rib 10f is provided in the end surface 10c of the bracket 10 in order to ensure further rigidity.

  As shown in FIG. 3, of the four bolts 7 that fasten the bracket 10 and the shaft member 20, the nut 8 is below the nut 8 screwed to the bolt 7 on the V rod 4 side. A block-shaped detent 30 that abuts and restricts the rotation of the nut 8 is fixed to the V rod support portion 10s of the bracket 10 by welding.

  A cross-sectional view taken along the line XX of FIG. 4 is shown in FIG. As shown in FIG. 1A, the bracket 10 includes a first plate member 12 and a second plate member 14 that are symmetric, and a first plate member 12 and a second plate member 14. The first plate member 12 and the second plate member 14 are configured by superposing and welding the third plate member 16 having a lower upper surface and a larger thickness. A bolt hole 10 e common to the three plate-like members 12, 14 and 16 is bored in the V rod support portion 10 s of the bracket 10.

One side surface 20b of the shaft member 20 in which the bolt hole 20e is formed is coupled to the outer side surface 14b of the second plate-like member 14 of the bracket 10.
Bolts (not shown) are inserted into the bolt holes 10e and 20e of the bracket 10 and the shaft member 20, and the nut 8 indicated by a two-dot chain line in FIG. Conclude.

  A block-shaped detent 30 that contacts the nut 8 and restricts the rotation of the nut 8 is provided on the outer surface 12b of the first plate-like member 12 of the bracket 10 below the nut 8 and on the lower surface 30d thereof. (Hereinafter, referred to as a welded portion 40) is fixed by welding. Further, the rotation stopper 30 is welded by chamfering in advance a corner portion between a contact surface 30a with the nut 8 and a side surface (hereinafter referred to as a welding surface) 30b welded to the bracket 10.

  Here, the surface processing in the detent structure of the fastening member according to the present embodiment will be described. As shown in FIG. 1B, in order to reduce the surface roughness by setting the seating surface 11 to a predetermined position at the portion where the bottom surface 8d of the nut 8 contacts the side surface 12b of the first plate-like member 12, A surface 11 serving as a seating surface of the nut 8 is processed. The seat surface 11 becomes a curved surface toward an edge portion (hereinafter referred to as a peripheral portion) 11a with the side surface 12b depending on the shape of a tool or the like to be processed. In FIGS. 1A and 1B, the depth of the seating surface 11 is expressed for the sake of clarity, but in actuality, a minute amount is processed so that the surface roughness is reduced.

  Further, the detent 30 welded to the outer side surface 12b of the first plate-like member 12 of the bracket 10 is suppressed to an appropriate dimensional tolerance suitable for the shape of the nut 8, and the abutment surface 30a is set at a specified position and the surface. In order to reduce the roughness, surface treatment is applied to the contact surface 30a with the nut 8. In addition, the part shown with the dashed-two dotted line 30a 'in FIG.1 (b) is the upper surface of the rotation stopper 30 before surface treatment processing is carried out.

  Since this embodiment is a detent structure applied to the nut 8 whose bottom surface 8d is chamfered, even if the seating surface 11 is curved toward the peripheral edge portion 11a, the bottom surface 8d of the nut 8 The bottom surface 8d of the nut 8 does not contact the curved surface portion by the chamfered portion. For this reason, the seat surface 11 is processed so that the lowermost surface of the peripheral edge portion 11 a is substantially at the same position as the contact surface 30 a of the rotation stopper 30. Since both the contact surface 30a and the seating surface 11 are processed in a small amount, the seating surface 11 can be processed first, and of course, the contact surface 30a can be processed first.

  In this manner, the rotation stopper 30 in the rotation stopper structure of the fastening member is formed with a chamfered surface (hereinafter referred to as a chamfered portion) 32 between the contact surface 30a of the rotation stopper 30 and the welding surface 30b. Therefore, the contact surface 30a and the seating surface 11 can be separately surface-treated. Furthermore, since the chamfered portion 32 creates a predetermined gap from the processing end of the contact surface 30a to the seat surface 11, the tool feed amount with respect to the bolt axis direction can be increased during processing of the contact surface 30a of the detent 30. Even if it does not manage to precision, the possibility of processing up to the side surface 12b of the first plate-like member 12 can be eliminated, and the contact surface 30a and the seating surface 11 can be easily processed separately.

In particular, when the seat surface 11 is first processed and then the contact surface 30a of the detent 30 is processed, the feed amount of the tool with respect to the bolt axis direction becomes very important and must be managed with high accuracy. However, the chamfered portion 32 eliminates this risk, so that the contact surface 30a after the seat surface 11 is processed can be easily processed.
Therefore, it is not necessary to use a special tool or processing machine that can be processed simultaneously, and processing with a general tool or machine tool is possible, thereby reducing costs. In particular, in the present embodiment, the bracket 10 serving as a support member is a welded structure product obtained by superposing a plurality of sheet metals and bonding them together by welding, and the chamfered portion 32 cannot be formed integrally in advance. The anti-rotation structure according to the present embodiment in which is formed is suitable.

  In the present embodiment, the anti-rotation structure has been described using the nut as an example. However, since the fastening member includes the nut and the bolt, the bolt head may of course contact. That is, the detent of this embodiment is applicable also to what the bottom face of the bolt head is chamfered.

[Second Embodiment]
Next, a detent structure for a fastening member according to a second embodiment of the present invention will be described with reference to FIG. In addition, this embodiment is a detent | locking structure applied to what the bottom face of a nut is not chamfered.

FIG. 5A and FIG. 5B are cross-sectional views of the main part for explaining the structure for preventing the fastening member from rotating according to this embodiment. The same members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant descriptions are omitted.
As shown in FIGS. 5A and 5B, the fastening member detent structure according to the present embodiment is configured in the same manner as in the first embodiment except for the seat surface 11 ′.

  FIG. 5A is a cross-sectional view taken along the line XX in FIG. As shown in FIG. 5A, the bracket 10 includes a first plate member 12 and a second plate member 14 that are symmetric, and a first plate member 12 and a second plate member 14. The first plate member 12 and the second plate member 14 are configured by superposing and welding the third plate member 16 having a lower upper surface and a larger thickness. A bolt hole 10 e common to the three plate-like members 12, 14 and 16 is bored in the V rod support portion 10 s of the bracket 10.

One side surface 20b of the shaft member 20 in which the bolt hole 20e is formed is coupled to the outer side surface 14b of the second plate-like member 14 of the bracket 10.
Bolts (not shown) are inserted into the bolt holes 10e and 20e between the bracket 10 and the shaft member 20, and a nut 8 'indicated by a two-dot chain line in FIG. And conclude.

  A block-shaped detent 30 that contacts the nut 8 'and restricts the rotation of the nut 8' is provided on the outer surface 12b of the first plate member 12 of the bracket 10 below the nut 8 '. The side closer to 10 (hereinafter referred to as welded portion 40) is fixed by welding. Further, the rotation stopper 30 is welded by chamfering in advance a corner portion between a contact surface 30a with the nut 8 'and a side surface (hereinafter referred to as a welding surface) 30b welded to the bracket 10.

  Here, the detent 30 welded to the outer surface 12b of the first plate-like member 12 of the bracket 10 is restrained to an appropriate dimensional tolerance suitable for the shape of the nut 8 ', and the contact surface 30a is set at a specified position. In order to reduce the surface roughness, surface treatment is applied to the contact surface 30a with the nut 8 '. In addition, the part shown with the dashed-two dotted line 30a 'in FIG.5 (b) is the upper surface of the rotation stopper 30 before surface treatment processing is carried out.

  The present embodiment is a detent structure applied to the nut 8 'whose bottom surface 8d' is not chamfered. The detent 30 is welded to the contact surface 30a with the nut 8 'and the bracket 10. Since the chamfer has been applied in advance to the corner of the side surface (hereinafter referred to as the welding surface) 30b, the corner of the nut 8 'does not interfere with either the detent 30 or the first plate member 12, It is possible to tighten a bolt on the nut 8 '. In addition, when the product fastened by nut 8 'and a bolt does not require processing accuracy, the surface treatment processing of the seat surface 11' may be omitted as in the present embodiment.

  In this manner, the rotation stopper 30 in the rotation stopper structure of the fastening member is formed with a chamfered surface (hereinafter referred to as a chamfered portion) 32 between the contact surface 30a of the rotation stopper 30 and the welding surface 30b. Therefore, a predetermined gap is created from the processing end of the contact surface 30a to the seat surface 11 ', and the tool feed amount with respect to the bolt axis direction is managed with high accuracy when processing the contact surface 30a of the detent 30. Even if not, the possibility of processing up to the side surface 12b of the first plate-like member 12 can be eliminated, and the contact surface 30a and the seating surface 11 'can be easily processed separately.

Therefore, it is not necessary to use a special tool or processing machine that can be processed simultaneously, and processing with a general tool or machine tool is possible, thereby reducing costs. In particular, in this embodiment, the bracket 10 serving as the support member is a welded structure product in which a plurality of sheet metals are bonded together by welding, and the chamfered portion 32 is formed because the rotation stopper cannot be formed integrally in advance. The detent structure according to this embodiment is suitable.
Furthermore, in this embodiment, since it can apply also to what the bottom face of nut 8 'is not chamfered, the applicable range of the rotation prevention structure concerning this embodiment becomes wide.

In the present embodiment, the anti-rotation structure has been described using the nut as an example. However, since the fastening member includes the nut and the bolt, the bolt head may of course contact. That is, the detent of the present embodiment can be applied to a bolt whose bottom face is not chamfered.
Further, in this embodiment, the surface treatment of the seating surface is omitted, but the surface treatment of the seating surface is performed in order to reduce the surface roughness by setting the seating surface to a specified position as in the first embodiment. It may be given.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case of applying a welded structure product in which three sheet metals are superposed and bonded together by welding has been described. However, the sheet metal to be bonded may not be three sheets, and the support member May be a single component without bonding sheet metal.

  In the above embodiment, the example of the detent structure applied to the axle side attachment portion of the V rod in the large truck has been described. However, the embodiment is applied to a fastening member composed of a bolt and a nut for fastening two members. For example, it is not limited to the above example.

DESCRIPTION OF SYMBOLS 1 Tire 2 Side frame 3 Axle housing 4 V rod 5 Frame side attaching part 6 Axle side attaching part 7 Bolt 7
8,8 'Nut 9 Rubber 10 Bracket (supporting member)
11, 11 ′ Seat 12 First plate member 14 Second plate member 16 Third plate member 20 Shaft member (joining target member)
30 Detent 32 Chamfered portion 40 Welded portion 60 Support member 61 Seat 70 Member to be joined 80 Detent 90 Deweld

Claims (3)

A support member having a bolt hole;
A member to be coupled having a bolt hole and coupled to the support member;
A fastening member for fastening the support member and the coupling target member, including a bolt inserted into each bolt hole of the support member and the coupling target member and a nut screwed to the bolt;
Corresponding to the position of the head of the nut or the bolt when the support member and the member to be coupled are fastened, the support member is welded to the support member, and rotates in contact with the head of the nut or the bolt. A block-shaped detent that regulates, and
The anti-rotation structure of a fastening member, wherein the anti-rotation is chamfered at a corner portion between a contact surface of the nut or the head of the bolt and a welding surface of the support member. The fastening member according to claim 1, wherein the contact surface is subjected to a surface treatment for setting the contact surface at a predetermined position and reducing a surface roughness of the contact surface. Non-rotating structure. The fastening structure for a fastening member according to claim 1 or 2, wherein the support member is a welded structure product obtained by superposing a plurality of sheet metals and bonding them by welding.

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