JPS6334757Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a collar that provides a strong mechanical connection between a pipe and a perforated plate member.

[Conventional technology]

To date, the manufacture of muffler devices for vehicle silencers has typically required heavy welding between the various parts thereof, particularly between the tube and the buttle.
This welding is time consuming and can lead to corrosion around the weld points.
Moreover, sooner or later the yield of the welded parts required to replace the entire silencer is likely to deteriorate. Furthermore, to facilitate such welding, conventionally the buttful has been provided with a flange surrounding the hole into which the tube is inserted. Forming this flange also increases the manufacturing effort of the welded muffler device and therefore
increasing its final cost.

expanding the muffler tube to form a ridge on each side of the buttful or at the opening of the end cap collar;
There is a proposal for a non-welded structure in which the muffler tube is held in a buttful or collar. but,
This still requires accurate pre-assembly before the muffler tube can be expanded and joined, as it still requires widening the opening of the buffle or end cap and forming a flange. Also, since the muffler tube is not expanded inside the flange portion, the buttful remains as tight as in the original sliding fit.

Furthermore, Japanese Patent Application Laid-Open No. 58-38622 discloses a structure formed by attaching the ends of a vertical frame to a horizontal plate using an outer cover, but in this outer cover, Before installation, the flange at one end of the hollow cylindrical body is bent toward the inside of the body.
It is formed into a letter shape. However, in order to fix the end of the vertical frame to the horizontal plate by bending it together with the end of the vertical frame, it was not possible to do this using a single part of the structure, so a pair of press molds were used. There is a problem in that it has to be used and costs are high. In addition,
The other flange that protrudes outward from the other end of the outer cover extends at right angles from the body of the outer cover, so its outer periphery tends to separate from the horizontal plate, causing the connection to close like a muffler. Trouble occurs when it has to be firmly fixed.

[Problem that the invention attempts to solve]

This invention solves the problems associated with conventional mufflers as described above, and in particular provides a collar which is modified to securely connect a battler plate, which is a type of plate-like member, to a muffler tube, which is a type of pipe, without the use of a press die, and which has a flange which extends outward from one end of a wall portion with a circular cross section, with its outer peripheral end pressed against one surface of the battler plate, thereby mechanically and strongly fixing the battler plate to the muffler tube.

[Means for solving problems]

In order to solve the above problems, a collar based on this invention includes: an annular side wall; a first flange formed at one end of the side wall and extending inwardly;
a second flange formed on the other end of the side wall and extending outwardly therefrom, the first and second flange forming an acute angle with the side wall, and one end of the tube inserted into the side wall. , the first flange portion is configured to extend inwardly beyond the inner circumferential surface of the one end of the tube when one end thereof is brought into contact with the back surface of the first flange portion.

Preferably, the first and second flange portions form an acute angle with the side wall of substantially 70°.

Further, the tube is a muffler tube that extends in the longitudinal direction within the barrel of the muffler, and the plate-like member is disposed within the barrel at right angles to the longitudinal direction to partition the inside of the barrel and is fixed to a corresponding end of the muffler tube. As a plate, the collar can be used in the manufacture of mufflers.

[Effect]

The side wall of the collar with this configuration is inserted into the hole of the plate-like member, and the end of the tube to be connected to the plate-like member is inserted into the side wall from the second flange side, and the end is connected to the first flange. When the other tube or mandrel is pushed in from the first flange side, the side wall is bent outward together with the corresponding end of the tube that was first inserted into the side wall, and the collar becomes S-shaped or Z-shaped and is bent. The inner circumferential surface of the side wall and the lower surface of the first flange part hold the bent end of the tube to be connected to the plate member, and the outer circumferential surface of the side wall and the second
The plate member is held on the opposing surface of the flange portion. At this time, the outer circumferential edge of the second flange portion reliably contacts the corresponding surface of the plate-like member, and the plate-like member is firmly held by the collar, so that the plate-like member and the pipe are reliably connected. It turns out.

[Effects of Examples and Ideas]

Hereinafter, this invention will be explained based on examples with reference to the drawings.

In FIG. 1, a fixed collar (hereinafter simply referred to as "collar") 1, which is an embodiment of this invention, is
It has a side wall 3 having a substantially circular cross section, with a radially inward flange portion (first flange portion) 4 at one end and a radially outward flange portion (second flange portion) 2 at the other end. It is formed.

When used in the manufacture of muffler devices, the collar 1 is generally a non-corrosive metal, eg stainless steel, of a suitable gauge size, eg 1 mm or 1.2 mm. Apart from this, the collar 1 is made of mild steel coated to prevent corrosion, or made of the same material or coated with the other parts to avoid electrolytic action.

Inward flange portion 4 and outward flange portion 2
form acute included angles θ ₁ and θ ₂ , respectively, with the side wall 3 (of the order of 70° seems appropriate).

In FIG. 2A, the collar 1 is located at the free end 5A of the tube 5 inserted into the hole 6a in the plate member 6. In FIG. The outward flange portion 2 is located on the lower surface of the plate-like member 6 in a portion around the hole 6a, and the inward flange portion 4 sits on the free end 5A of the tube 5 and is further radially extends inward.

A suitable mandrel or other similar member, for example, can be used to guide the tube 8 in the direction of arrow A.
Apply axial pressure by inserting into A. In this case, the desired physical or mechanical connection is created between the tube 5 and the plate-like member 6. Therefore,
As shown in FIG. 2B, the free end of the tube 5 is expanded by the axial pressure.
At the same time, the inwardly directed flange portion 4 is also pushed axially inward, forming a rim 10 that coincides with and grips the flap-like free end 5A of the tube 5. side wall 3
Also, the portion adjacent to the outward flange portion 2 has a shape that matches the outer circumferential surface of the free end 5A of the pipe 5. Therefore, the portion of the plate-like member 6 around the hole 6a is gripped between the side wall 3 and the outward flange portion 2.

As described above, the free end 5A of the tube 5 and the collar 1 are deformed, and a strong mechanical joint is formed between the tube 5 and the plate member 6.

By making the included angle θ ₁ between the flange portion 4 and the side wall 3 acute, the tube 8 can be easily introduced. It is believed that the included angle θ ₂ defined by the flange portion 2 and the side wall 3 will contribute to the bond obtained as described below.

Since the collar 1 is a drawn metal part, the inner surface of the side wall 3 and the flange portion 2 connected thereto
The boundary between the collar 1 and the surface is a rounded part with a radius equal to the thickness of the metal material at the minimum, and the collar 1 is
It includes a substantially ring-shaped body and a flange portion 2 connected to one end of the body via the above-mentioned rounded portion.

When a force in the axial direction indicated by arrow A is applied, "twisting" of the collar 1 is prevented because of the curved part, that is, the radiused part in the flange part 2. especially,
As shown in FIG. 2A, the value of the width of the flange portion 2 and the acute included angle θ ₂ between the flange portion 2 and the side wall 3 is the same as that of the outer peripheral edge of the flange portion 2 before the axial force A is applied. is sized so that it comes into contact with the plate-like member 6. When an axial force (pressure) A is applied, the edge of the hole 6a in the plate member 6 becomes a pivot point. Therefore, as the expanding portion moves ``outward'', an inward force is created on the opposite side of the pivot point that, if unrestricted, will cause the collar to ``displace'' from the pivot point. In this case, the rounded portion of the collar is drawn into the hole 6a of the plate-like member 6, and therefore the flange portion 2
will no longer come into close contact with the plate member 6, resulting in an inferior joint.

In order to obtain a good joint, it is necessary to apply appropriate constraints to reduce the above-mentioned inward forces and suppress inward movements. To achieve this, it is necessary to separate the pivot points and reaction points mentioned above. Pressure is applied to the bell-shaped flange part 2, but by making sure that the outer peripheral edge of the flange part 2 comes into contact with the "inner surface" of the plate-shaped member 6 when this pressure is applied,
The rounded portion of the flange portion 2 becomes a reaction point located below the pivot point. In this way, when the joint is manufactured, the inward force that tends to separate the flange portion 2 from the plate member 6 is suppressed by the tube 5, and a reliable joint is obtained. As shown in FIG. 2B, the edge 9 of the rim 10 formed by the deformed flange 4 allows the passage of the tube 8 inserted into the tube 5 while the joint is being formed. This is because the tube 8 can be introduced while the tube 5 is deformed at the free end 5A.

FIG. 3 shows an embodiment in which the invention generally explained in FIGS. 1 and 2 is applied to a muffler semi-finished product (subassembly product) 40. In FIG. 3, a muffler tube 5 (hereinafter referred to as 5) is fixed to a plurality of baffle plates (hereinafter referred to as 6 in this embodiment) which are plate-like members. , fixed collars 1A, 1B, and 1C (having the same structure as the collar 1) are provided between the corresponding end of the muffler tube 5 and the buff-full plate 6.

Such a semi-finished muffler product 40, if necessary,
Either by utilizing end connectors to form a silencer of the desired length or by adjusting the length and diameter of the inlet and/or outlet tubes to fit this semi-finished product. Can be connected. And muffler semi-finished product 4
0 is a tight fit within the outer case of the barrel without the need for welding.

As shown in the figure, a plurality of exhaust gas holes or louvers 13 are provided in the side wall of the pipe 5, as is known in the art.

In order to manufacture the muffler semi-finished product 40, collars 1A, 1B and 1 are attached to each end of the muffler tube 5, respectively.
C is provided, and the end of the muffler tube 5 with these collars is inserted into the opening in the buff-full plate 6. Pushing is carried out, so that a mechanical connection or mechanical joint as shown in FIG.

FIG. 4 shows a hydraulic press device 11 used to manufacture a muffler semi-finished product as shown in FIG. 3 or a finished muffler product as shown in FIG. 5 as described below.

The press device 11 has lower anvils 14, 15 on which the semifinished product shown in FIG. 3 is placed before mechanical bonding. The upper anvil 20 is movable in a vertical plane as indicated by arrow Z and is adapted to cover the lower anvils 14,15. The upper anvil 20 has a recess 39 formed therein so as to receive the curved portion (i.e., the side surface) of the muffle tube 5 . Upper anvil 2
0 closes over the semi-finished product 40, a pressing operation is performed and the lower anvil 14 is separated from the other lower anvil 15 by a predetermined small distance (e.g. 0.5 inches (1.27 centimeters)) and the flange 2 of the collar is fixed at a supported position so as not to apply compressive stress to the muffler tube 5.

The mandrel 38 then engages and applies axial pressure to the corresponding collars 1A, 1B, 1C provided at the end of the muffler tube 5 until a bond is formed between the muffler tube 5 and the buttful plate 6. The member (ram) 16 moves towards the upper anvil 20. A spring-loaded collar 22 around each mandrel 38 holds the collar, muffle tube, and buffle plate in the desired alignment relative to each other once this coupling occurs. When the distance between the end member 17 and the anvil 15 is reduced, pressure is applied to the rod 18 by the muffler semi-finished product. Pressure continues to be applied to the muffler half-finished product until the muffler tube and the buttful plate are physically or mechanically connected, at which time the end member 16 returns to the stop position of the other stationary end member 19. . Then stick 1
8 pushes the end pieces 17 apart, and a spring (not shown) provided below the end pieces 16 causes the anvil 14 to retreat towards the anvil 15 by the above-mentioned distance. Then, the upper anvil 20 is automatically lifted and the finished muffler semi-finished product 41 is removed.
The total time required for this processing is, for example, on the order of 30 seconds.

A mandrel 23 on the end member 17 is provided with a spring-loaded collar 22 which has a similar purpose to the collar 22 on the end member 16.

The mandrels 38 and 23 are mounted on corresponding end members of the press 11, and these end members are adjusted in the vertical and horizontal directions of the corresponding mandrels prior to fixing to form a butt-full part of the muffler semi-finished product. The position of the opening in the plate 6 can be set. In addition, adjustment to suit the length of the muffler semi-finished product 40 is also possible.

Muffler tube 5 is one thick plate 6
If it is only necessary to connect the rod 18 to the anvil 15, the rod 18 can be fixed relative to the anvil 15 and only the end member (ram) 16 can be moved.

The press device shown in FIG. 4 is only a highly schematic representation of a press device suitable for joining mufflers or other necessary assemblies or semi-finished products.

By the way, by utilizing this invention, one end or both ends of a plurality of muffler tubes 5 can be inserted into and fixed to the buttful plate 6 having holes at the same time. Avoid inserting or welding into the Also, it is no longer necessary to provide enlarged or flanged holes in the buttful plate 6. Furthermore, the mechanical joint or joint obtained by the present invention not only has higher rigidity and is superior to a welded joint, but also has the advantage that, firstly, by swaging,
Corrosion around the joint as a result of material deterioration caused by welding can then be avoided.

FIG. 5 shows a longitudinal sectional view of the finished muffler 30.

The muffler 30 has a barrel (body) 31, and end caps 27, 28 are fixed to both ends of the barrel. The inlet side pipe 26 passes through an end cap 27 and is fixed thereto, and its reduced diameter portion 26A is inserted into the muffler semi-finished product 32 (in particular, the pipe 5 having a louver).
extends inward.

Each muffler tube 5 of the muffler semi-finished product 32 is connected to a buffle plate 6 having an opening at each end by a collar.

Similarly, the plate 29 is different from the full plate 6.
a reversing chamber 33 and a Helmholtz chamber 3 with one end cap 28 and one end cap 28 respectively.
4. Tuning tube 35 passes through plate 29 and is connected to it by a collar. Exhaust gas from the muffler semi-finished product 32 is exhausted through an exhaust pipe 36. The inlet pipe 26 and the exhaust pipe 36 are connected to the corresponding end caps 27 and 2 by fittings 24 formed using non-crimping technology.
8, but the end caps 27 and 28 are fitted with lock seam rolled joints.
It is connected to the barrel 31 by seamed rolled joints 25. In any case, no welding is required over the entire muffler.

The ability to produce a variety of semi-finished products (sub-assemblies) that are rigidly fixed, precisely aligned, and quickly assembled is the basis for highly efficient modular production. It is. At the stage shown in FIG. 5, the finished product does not require any welding. Welding is only necessary for the attachment of accessories such as extension pipes or brackets, for example.

The embodiment of this invention has been explained above,
It goes without saying that this invention is not limited to these, and includes various modifications.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one embodiment of the fixed part of the muffler of this invention, Fig. 1A is a longitudinal sectional view of Fig. 1, and Fig. 2
Figure A is a vertical cross-sectional view of the plate-like member and the pipe immediately before they are joined together, Figure 2B is a vertical cross-sectional view of the joint that has been obtained after the joint has been completed, and Figure 3 is a vertical cross-sectional view of the state in which the plate-shaped member and the pipe are connected. A schematic perspective view of the manufactured muffler semi-finished product, FIG. 4 is a perspective view of the main part of the press apparatus for manufacturing the muffler semi-finished product shown in FIG. 3, and FIG. 5 is a schematic longitudinal cross-section of the muffler manufactured using this invention. It is a front view. 1, 1A, 1B, 1C...Color, 2...Flange part, 3...Side wall, 4...Flange part, 5...
Tube (muffler tube), 5A...free end, 6...
Plate member (full plate), 6a... hole, 8
... tube, 9 ... edge, 10 ... rim, 11 ... press device, 13 ... louver, 14, 15 ... lower anvil, 16 ... ram, 17 ... end member, 18 ...
...rod, 20...upper anvil, 22...color,
23...Mandrel, 24...Joint, 26...Inlet side pipe, 26A...Reduced diameter section, 27, 28...End cap, 29...Plate, 30...Muffler, 31...Barrel, 32... Muffler semi-finished product, 3
3... Reversing chamber, 34... Helmholtz chamber, 35... Tuning chamber,
38...mandrel, 39...recess, 40...muffler semi-finished product.

Claims (1)

[Claims for Utility Model Registration] (1) An annular side wall, a first flange formed at one end of the side wall and extending inward from the side wall, and a first flange formed at the other end of the side wall and extending outward from the side wall. the side wall is inserted into a hole formed in the plate-like member, one end of the tube is inserted into the side wall and abuts against the first flange, and the side wall is pushed outward. In the collar for connecting the pipe and the plate member by bending, the second flange portion forms an acute angle with the side wall, and the outer circumferential edge of the collar forms an acute angle with respect to the side wall. A collar, wherein the first flange portion forms an acute angle with the side wall and extends inward from the one end of the tube. (2) The collar according to claim 1, wherein the acute angle of the first flange portion and the second flange portion with respect to the side wall is substantially 70°. (3) The tube is a muffler tube that extends in the longitudinal direction within the barrel of the muffler, and the plate-like member is disposed within the barrel at right angles to the longitudinal direction and partitions the inside of the barrel, and the corresponding end of the muffler tube. The collar according to claim (1) or (2) of the utility model registration, characterized in that it is a buttful plate to which is fixed.