JPH0229888B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to washers and spacers used for bolt fastening, and more particularly to a combination thereof.

Prior Art and Problems to be Solved by the Invention Spacers and washers are sometimes used in bolted parts that connect and fix two members together. For example, the bolt connection between the power steering pump and the power steering bracket of a vehicle such as an automobile has conventionally been generally provided integrally with the housing of the power steering pump 101, as shown in FIGS. 13 and 14. A pair of stays 102 and 10 spaced apart from each other
Insert the power steering bracket 104 between the two stays 102 and the bracket 10.
Through holes 105 and 106 provided in 4, respectively.
This is done by inserting a bolt 107 into the stay 103 and screwing the tip of the bolt into a screw hole 108 provided in the other stay 103.
a substantially cylindrical spacer 112 having a hole 111 for receiving the bolt and abutting against the back surface of the head 110 of the bolt via 9; a disk-shaped washer having a larger outer diameter than the spacer and having a hole 113 for receiving the bolt; 114 is used.

That is, the width of the bracket is set smaller than the distance between the stays so that the bracket 104 can be easily inserted between the pair of stays 102 and 103, and the width of the bracket is set to be smaller than the distance between the stays. Since it is made of a low-quality aluminum alloy, etc., it prevents excessive bending stress from acting on the stay, and also prevents the bearing surface of the bracket from collapsing due to crushing and loosening the bolted joint. The spacer 112 is inserted into the through hole 1 of the stay 102.
05, a washer 114 is interposed between the spacer and the bracket, a bolt is inserted into each hole, and its tip is screwed into the screw hole 108, thereby inserting the spacer and washer between the head of the bolt and the bracket. A pair of stays and a bracket are firmly fastened together by compression, and in this case, the spacer has no function of absorbing the gap c between one stay and the bracket. The washer acts to reduce the surface pressure exerted on the seat surface of the bracket.

However, when bolting is performed using the spacer 112 and the washer 114, which are configured separately from each other, the spacer and washer are connected so that the spacer hole 111, the washer hole 113, and the through hole 106 of the bracket are aligned with each other. The problem is that the work efficiency is very poor because the bolts must be positioned and the bracket must be positioned, and then the bolts must be inserted and screwed into each hole.

In order to solve this problem, as shown in FIGS. 15 and 16, a flange 116 that functions as a washer is provided at one end of the spacer 115, so that the washer and spacer are mutually rigidly integrated. If it is a member, the seating surface 1 of the bracket that the flange comes into contact with may be due to improper machining accuracy of the through hole 105, spacer 115, etc.
If the bolt 107 is tightened when the parallelism between the bolt 17 and the end surface 118 of the flange is out of alignment, the flange will come into uneven contact with the seat surface of the bracket, resulting in local crushing of the seat surface of the bracket. Also, since the spacer has an integral flange, it is difficult to deform due to diameter reduction.
Therefore, due to the increased surface pressure exerted by the outer circumferential surface of the spacer on the inner circumferential surface of the through hole 105, the spacer is pressed against the seat surface 11 when tightening the bolt.
7 does not slide smoothly relative to the stay 102, which causes a problem that the gap between the end surface 118 of the flange and the seat surface 117 is not well absorbed.

Furthermore, Japanese Utility Model Application Publication No. 58-142490 discloses a method in which a pair of stays integrally provided on one member and a pair of stays provided integrally on the other member are engaged with each other and are fastened by bolts. The spacer has a fixing structure, has a hole for receiving a bolt, has a male thread on the outer peripheral surface, and is configured to be screwed into a screw hole provided in a stay of one or the other member, By rotating the spacer while screwed into the screw hole, one end of the spacer is brought into contact with the opposing surface of the other member to eliminate the gap between them, and then the spacer and the stay are inserted into the holes of the spacer and the stay. A fastening structure is disclosed that is configured to pass through and tighten bolts.

In such a fastening structure, it is possible to easily absorb the gap between the mutually opposing stays of both members, but in order to reduce the surface pressure exerted on the seating surface of the stay that one end of the spacer abuts, The diameter of the spacer must be increased, and it is often difficult to increase the diameter of the spacer due to the size of the stay, and therefore it is difficult to reduce the surface pressure exerted on the stay. Moreover, since male threads and threaded holes must be formed on the outer circumferential surface of the spacer and the stay, respectively, there is a problem that the fastening structure is expensive.

In view of the above-mentioned problems in the conventional bolt fastening structure, the present invention aims to provide a washer-spacer assembly for bolt fastening which has an improved and simple structure so as to solve these problems. The purpose is

Means for Solving the Problems According to the present invention, it is an object of the present invention to provide a washer-spacer combination which is incorporated into the bolted portion of the first and second members, and which has a substantially substantially bolt-receiving hole. has a cylindrical spacer and a plate-shaped washer having a hole for receiving a bolt, the spacer is inserted into the first member and engages one side of the washer at one end, and the washer at the other end. The washer is configured to receive a head of a bolt or a nut threaded onto the bolt, and the washer is disposed between the first and second members with the other side abutting the second member. one end of the spacer and the washer are interconnected so as to be movable relative to each other within a range that substantially maintains the alignment of their holes, and when the bolt or the nut is tightened, the washer is accomplished by a washer-spacer combination configured to be pressed against the second member by the spacer.

Effects and Effects of the Invention According to the configuration as described above, one end of the spacer and the washer are interconnected so as to be movable relative to each other within a range that substantially maintains the alignment of the holes, and the bolt or nut is When tightened, the washer is pressed against the second member by the spacer.

Therefore, compared to the case where the spacer and washer were constructed as completely independent members,
Bolts can be easily inserted into the spacer and washers, and the workability of bolt fastening can be improved. Furthermore, even if bolt tightening is started when the axis of the hole in the spacer is not perpendicular to the seating surface of the second member that the washer contacts, the washer will not be pressed against the second member by the spacer. During this process, the washer moves relative to the spacer, and the other side of the washer can come into contact with the seating surface of the second member over substantially the entire surface, so that the washer is not integrated into one piece. As in the case where a formed spacer is used, it is possible to avoid the sinking of the seat surface of the second member due to the washer coming into partial contact with the seat surface of the second member. Furthermore, the spacer can rotate relative to the washer when the bolts are fastened, and the spacer can relatively easily move in the axial direction within the hole of the second member that receives it, compared to a spacer in which the washer is integrally formed. Since the bolt can be slid to the bottom, bolt fastening work can be carried out smoothly.

Further, according to the present invention, it is possible to increase only the size of the washer, and there is no need to form screws in the outer circumferential surface of the spacer and the hole in the member that receives it. Compared to the fastening structure described in Japanese Patent No. 142490, it is possible to reliably avoid depression of the seating surface of the member that the washer engages with, and bolt fastening can be carried out at low cost.

According to one detailed feature of the invention, the connection between one end of the spacer and the washer is achieved by crimping a portion of at least one of the spacer and the washer relative to a portion of the other. According to this configuration, by returning the caulked and deformed portion to substantially its original state, the bolted portion can be disassembled as necessary using the bolted washer-spacer combination of the present invention. This can be done relatively easily.

According to another detailed feature of the invention, the holes in the washer are larger than the holes in the spacer. According to this configuration, it is possible to increase the range in which one end of the spacer and the washer can move relative to each other within a range that substantially maintains the alignment of their holes, and it is also possible to increase the range in which the one end of the spacer and the washer can move relative to each other, and the bolts can be inserted into the holes of the spacer and washer. Easy insertion can be ensured.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be explained in detail below by way of example embodiments with reference to the accompanying figures.

Figure 1 shows a washer for bolt fastening according to the present invention.
A vertical cross-sectional view showing one embodiment of a spacer combination,
Figures 2 and 3 are a plan view and a vertical sectional view showing the spacer before being connected to the washer, respectively, and Figure 4
This figure and FIG. 5 are a plan view and a vertical cross-sectional view, respectively, showing the washer before being connected to the spacer.

In these figures, 1 indicates a washer-spacer combination, which is made up of a spacer 2 shown in FIGS. 2 and 3 and a washer 3 shown in FIGS. 4 and 5. There is. The spacer 2 has a substantially cylindrical shape with a hole 4 for receiving a bolt (not shown). Also, the spacer 2 has its axis 5
It has a C-shaped cross section with a slit 6 extending along the spacer, which allows the spacer to be relatively easily press-fitted into a hole whose diameter is smaller than the outer diameter of the spacer in its free state. There is. Further, a flange 7 extending in the circumferential direction and having a small radial projecting height and axial width is integrally formed on the outer peripheral surface of one end of the spacer. On the other hand, the washer 3 has a hole 8 for receiving a bolt (not shown) and is substantially disk-shaped. The outer peripheral edge of one end surface 9 of the washer 3 has an axis 1 extending in the circumferential direction.
An annular projection 11 protruding along 0 is integrally provided. Further, in the illustrated embodiment, the diameter D of the washer hole 8 is set larger than the diameter d of the spacer hole 4.

In the illustrated embodiment, the one end 2a of the spacer and the washer configured as described above are such that the inner circumference of the protrusion 11 is attached to the flange 7 over its entire circumference as indicated by the reference numeral 12. are deformed so that they are movable relative to each other, i.e. pivotable relative to each other and relative to each other about an axis, to the extent that the bores 4 and 8 substantially maintain alignment with each other. rotatably interconnected. In this case, the caulking deformation portions 12 may be formed only at several positions on the circumference of the washer, preferably at several positions evenly spaced apart in the circumferential direction.

The power steering pump as the first member and the power steering bracket as the second member are fixed to each other by bolts using the washer-spacer combination thus constructed, as shown in FIG. A washer is inserted into the through hole 15 of one of the stays 17 and 18 of a pair of stays 17 and 18 which are integrally provided in the housing of the power steering pump 14 and have a through hole 15 and a screw hole 16 and are spaced apart from each other. End face 1
The spacer 2 of the washer-spacer assembly 1 is press-fitted so that the distance between the spacer 9 and the opposite end surface 20 of the stay 18 is slightly larger than the width of the power steering bracket 21. The bracket 21 is inserted between the washer 3 and the stay 18 so that the hole 8 of the washer 3, the through hole 22 provided in the bracket 21, and the screw hole 16 are aligned with each other as shown in FIG.
With the spring washer 25 interposed between the head 24 of No. 3 and the spacer 2, the bolt 23 is inserted into the hole 4 of the spacer 2, the hole 8 of the washer 3, and the bracket 21.
This is done by inserting the bolt into the through hole 22 of the bolt and the screw hole 16 of the stay 18, rotating the head 24 with a wrench or the like, and screwing the tip of the bolt into the screw hole 16.

In this case, as the bolt is tightened, the washer
The spacer assembly 1 is displaced to the left as seen in FIGS. 6 and 7 until the distance between the end face 19 of the washer and the side face 20 of the stay 18 becomes equal to the width of the bracket 21, thereby causing the stay 17 and Bracket 2
1 is absorbed, the spacer 2 and washer are compressed between the spring washer 25 and the side surface 26 of the bracket 21, and in this state, the stays 17 and 18 and the bracket 21 are rigidly attached to each other. Fastened and fixed. In this case, as shown in FIG. 8, the axis 5 of the hole 4 of the spacer 2 and the side surface 26 of the bracket 21 are not aligned due to the machining accuracy of the through hole 15 of the stay 17 and the spacer 2 being inappropriate. Even if the vertical degree of
During the process of being pressed by the spacer 2, the washer 3 moves relatively to the spacer, and the washer 3
Since the end surface 19 of can be brought into contact with the side surface 26 over substantially the entire surface thereof, the washer will not come into partial contact with the side surface 26, as in the case where the spacer and the washer were formed rigidly and integrally. It is possible to avoid the occurrence of a problem in which the part collapses due to crushing.

9 to 11 are enlarged partial vertical sectional views showing main parts of another embodiment of the washer-spacer assembly for bolt fastening according to the present invention, and FIG.
The figure is a partial plan view of the washer in the embodiment shown in FIG. 11 before it is connected to one end of the spacer. In these figures, parts that are substantially the same as those shown in FIGS. 1 to 5 are designated by the same reference numerals.

In the embodiment shown in FIG.
is in the shape of a disc with a hole 8, and a part of its outer periphery 28 is indicated by reference numeral 28a for flanges 7 provided at one end of the spacer 2 at several locations spaced apart in the circumferential direction. It has been caulked and deformed as shown.

In the embodiment shown in FIG. 10, an annular projection 29 that protrudes along the axis 5 and extends circumferentially around the axis 5 is integrally formed on the inner circumference of the end surface 2b at one end of the spacer 2. The protrusion is deformed by caulking in the diametrically expanding direction as shown by reference numeral 29a with respect to the conical surface 30 that opens downward in the drawing of the washer 3.

In the embodiment shown in FIGS. 11 and 12, the washer is substantially disc-shaped with holes 8 on its outer periphery, evenly spaced from each other in the circumferential direction. The slit 31 defines a plurality of tongues 32 that are equally spaced apart in the circumferential direction and project radially outward, and the tongues are attached to a flange 7 provided at one end of the spacer 2. On the other hand, code 3
It has been caulked and deformed as shown in 2a.

Thus, in the embodiment shown in FIGS. 9-12, one end of the spacer and the washer are interconnected so as to be movable relative to each other to the extent that the mutual hole alignment is substantially maintained. Therefore, the first
As in the case of the embodiment shown in FIGS. 5 to 5, the workability during bolt fastening is improved, and it is possible to reliably avoid the occurrence of caving in the side surface of the member with which the washer comes into contact.

In any of the embodiments described above, the bolt 23 is inserted from the stay 17 side, but by inserting the bolt from the stay 18 side and screwing a nut onto its tip, the washer is inserted. The spacer assembly may be assembled such that the spacer receives a nut at the other end via a washer 25.

Although the present invention has been described above in detail with reference to several embodiments, the present invention is not limited to these embodiments, and various other embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art that

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 show the spacer in the embodiment shown in FIG. 1 before being connected to a washer. Plan view and longitudinal sectional view shown, No. 4
5 and 5 are a plan view and a vertical cross-sectional view, respectively, showing the washer in the embodiment shown in FIG. 1 in a state before it is connected to a spacer, and FIGS. 6 and 7
Figure 8 is an illustration showing how the power steering pump and power steering bracket are connected and fixed to each other by bolts using the washer-spacer assembly shown in Figures 1 to 5.
The figure shows that when bolts are fastened using the embodiments shown in FIGS. 9 to 11 are an enlarged partial vertical cross-sectional view showing another embodiment of the washer-spacer assembly for bolt fastening according to the present invention, and FIG. FIG. 12 is a partial plan view showing the washer of the embodiment shown in FIG. 11 in a state before it is connected to one end of the spacer, and FIG. 13 shows the spacer and washer that are constructed separately from each other. An illustration showing the conventional bolt fastening structure used, FIG. 14 is a perspective view showing the spacer shown in FIG. 13, and FIG.
The figure is a sectional view showing a conventional bolt fastening structure using a spacer with an integrally formed washer.
FIG. 16 is a perspective view of the spacer shown in FIG. 15. 1... Washer-spacer combination, 2... Spacer, 3... Washer, 4... Hole, 5... Axis line,
6...slit, 7...flange, 8...hole, 9
... End face, 10 ... Axis line, 11 ... Protrusion, 12 ...
...Caulking deformation part, 14... Power steering pump, 15... Through hole, 16... Screw hole, 17,
18... Stay, 19... End surface, 20... Side surface,
21...Bracket, 22...Through hole, 23...
Bolt, 24...Head, 25...Spring washer, 26...Side surface, 28...Outer rim, 28a...
Caulking deformation part, 29...Protrusion, 29a...Caulking deformation part, 30...Conical surface, 31...Slit, 3
2... Tongue piece part, 32a... Caulking deformation part, 101
...Power steering pump, 102,103
... Stay, 104 ... Bracket, 105,1
06...Through hole, 107...Bolt, 108...
Screw hole, 109... Spring washer, 110... Head, 111... Hole, 112... Spacer, 11
3... Hole, 114... Washer, 115... Spacer, 116... Flange, 117... Seat surface, 1
18... End surface.

Claims (1)

[Scope of Claims] 1. A washer-spacer assembly to be incorporated into the bolted portions of the first and second members, comprising a substantially cylindrical spacer having a hole for receiving the bolt, and a hole for receiving the bolt. and a plate-shaped washer, the spacer being inserted through the first member so that one end engages one side of the washer and the other end receives a head of a bolt or a nut screwed into the bolt. The washer is configured to be disposed between the first and second members with the other side of the washer in contact with the second member, and one end of the spacer and the washer are in contact with each other. are interconnected so as to be movable relative to each other to the extent that substantially the alignment of the holes is maintained, and when the bolt or the nut is tightened, the washer is pressed against the second member by the spacer. A washer-spacer combination configured to 2. In the washer-spacer combination according to claim 1, the connection is achieved by caulking a portion of at least one of the spacer and the washer with respect to a portion of the other. A washer-spacer combination body characterized by the following. 3. The washer-spacer assembly according to claim 1 or 2, wherein the washer has a larger hole than the spacer.