JPH0652931U - Metal carrier - Google Patents

Abstract

(57) [Abstract] [Purpose] To make it possible to mass-produce metal carriers for purifying exhaust gas emitted from automobile engines at low cost by the press-fitting method. A metal carrier in which a honeycomb body 1 in which flat plates and corrugated plates made of heat-resistant metal are alternately stacked or wound after being stacked is housed in an outer cylinder 2 made of heat-resistant metal, at least one end of the outer cylinder 2 By providing the inner peripheral surface with the tapered chamfer 4 for assisting the honeycomb body insertion which gradually expands toward the edge, the honeycomb body 1 can be smoothly press-fitted into the outer cylinder 2 without damage. I did it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal carrier used to purify exhaust gas emitted from an automobile engine or the like.

[0002]

[Prior art]

 As a metal carrier for exhaust gas purification, for example, as disclosed in Japanese Patent Publication No. 57-55886, a honeycomb body in which flat plates made of heat-resistant metal and corrugated plates are alternately stacked is housed in an outer cylinder made of heat-resistant metal. Various types have been developed and have already been put into practical use. As a method for producing this type of metal carrier, the honeycomb body is manufactured by using an outer cylinder through a cylindrical guide having a tapered surface for internal use of the honeycomb body. Generally, the method of press-fitting inside is used for production. In order to produce a metal carrier with high yield, it is ideal that the inner diameter of the cylindrical guide and the inner diameter of the outer cylinder are completely matched in the press-fitting step.

However, in reality, the inner diameter of the outer cylinder varies by at least about 0.2 mm in view of processing accuracy. Therefore, when the honeycomb body is press-fitted into the outer cylinder, the outer peripheral surface of the honeycomb body is changed to the outer cylinder. As a result, the phenomenon that it is narrowed down more than necessary and plastically deforms, and that the brazing foil material for joining with the outer cylinder attached to the outer peripheral surface of the honeycomb body peels off. However, there was a problem that the production rate of defective products was high and production efficiency was poor. On the other hand, various attempts have been made to machine the inner diameter of the outer cylinder without variation, but such precision machining is extremely expensive, and it is not possible to supply inexpensive products in large quantities. There was a problem.

[0004]

[Problems to be solved by the device]

 The present invention solves the above-mentioned conventional problems and allows the honeycomb body to be pressed into the outer cylinder without any damage even if there is some variation in the inner diameter of the outer cylinder. It was completed for the purpose of providing a metal carrier that can be produced in large quantities at a very low cost.

[0005]

[Means for Solving the Problems]

 The metal carrier of the present invention, which has been made to solve the above-mentioned problems, is an outer cylinder made of a heat-resistant metal in which a honeycomb body in which flat plates and corrugated plates made of heat-resistant metal are alternately stacked or wound after being stacked. In the metal carrier housed in, the outer cylinder is provided with a tapered chamfer for assisting insertion of the honeycomb body on at least one inner peripheral surface of the outer cylinder so as to gradually expand toward the edge. is there.

[0006]

[Action]

 The thus constructed honeycomb body is used for the purpose of purifying exhaust gas from an automobile engine etc. by using the honeycomb body as a metal carrier housed in an outer cylinder. It is similar to this type of conventional metal carrier in that it is manufactured by being housed in the outer cylinder by the above, but at least one end of the outer cylinder gradually expands toward the edge on the inner peripheral surface. Since a tapered chamfer for assisting honeycomb body insertion is provided, the honeycomb body is guided along the chamfer into the outer cylinder during press fitting, and even if there is some dimensional error in the outer cylinder inner diameter. Smooth press-fitting will occur without causing any damage.

Next, the present invention will be described in detail with reference to the drawings. In the figure, 1 is a honeycomb body formed by alternately stacking flat plates 1a and corrugated plates 1b made of a heat-resistant metal and winding them in a spiral shape (see FIG. 4). 2 is a heat-resistant metal for housing the honeycomb body 1. The outer cylinder 3 is a brazing portion for fixing the honeycomb body 1 to the outer cylinder 2. The honeycomb body 1 may be formed by alternately laminating the flat plates 1a and the corrugated plates 1b, or may be the one obtained by secondarily processing them into a flat shape.

On both inner peripheral surfaces of both ends of the outer cylinder 2, there are provided tapered chamfers 4 for assisting insertion of a honeycomb body, which gradually expand toward the end edges. The chamfer 4 is for guiding the honeycomb body 1 into the outer cylinder 2 so that the end portion of the honeycomb body 1 can be smoothly inserted without being caught by the end edge portion of the outer cylinder 2, when the honeycomb body 1 is pressed into the outer cylinder 2. It acts as a so-called guide. As the shape of the chamfer 4, as shown in FIG. 1, in addition to chamfering a part of the outer peripheral surface of the outer cylinder 2 on the inner peripheral surface side, a taper surface of the entire cylinder wall or a taper surface is used. An arcuate shape or the like can be applied. Further, the maximum inner diameter of the chamfer 4 at the upper end portion needs to be at least equal to or larger than the inner diameter of the lower end portion of the tubular guide described later.

In the embodiment, the chamfers 4 are formed at both ends of the outer cylinder 2. In this case, the honeycomb body 1 can be arbitrarily inserted from any direction of the outer cylinder 2. However, the chamfer 4 may be formed on at least one end inner peripheral surface of the outer cylinder 2 on the side where the honeycomb body 1 is inserted. 2 shows another embodiment, which shows a tandem-type metal carrier in which two honeycomb bodies 1 are housed in an outer cylinder 2 in series. In this case, the chamfer 4 is used. Are preferably formed at both ends of the outer cylinder 2, which allows the honeycomb body 1 to be smoothly press-fitted from both sides, which enables efficient production.

[0010] The thus constructed one is a conventional metal carrier for purifying exhaust gas of an automobile engine or the like, in which the honeycomb body 1 is housed in the outer cylinder 2 by a press-fitting method and is produced. Similar to the seed metal carrier. However, in the present invention, when the honeycomb body 1 is pressed by the punch 10 and is housed in the outer cylinder 2 via the guide 11 in the press-fitting process shown in FIG. Since the tapered chamfer 4 for assisting the insertion of the honeycomb body that gradually expands toward the edge is provided, the honeycomb body 1 is smoothly guided while being guided by the tapered chamfer 4 after passing through the guide 10. Therefore, even if there is some dimensional error in the inner diameter of the outer cylinder, it can be smoothly press-fitted without causing any damage. As a result, it is possible to efficiently mass-produce high-quality metal carriers without causing defective products even if the outer cylinder is machined with a precision as good as conventional. In addition, the metal carrier of the present invention does not cause any defective products in the press-fitting process even if the outer cylinder has the same machining accuracy as the conventional one, and the defect rate when the conventional outer cylinder without the chamfer is used. It was confirmed that the productivity was remarkably improved while the ratio was 10 to 30%.

[0011]

[Effect of device]

 As is clear from the above description, the present invention allows the honeycomb body to be press-fitted into the outer cylinder without any damage even if there is some variation in the inner diameter of the outer cylinder. In addition, it can be manufactured at an extremely low cost, and further, it has an advantage that the conventional production equipment can be used as it is without introducing new equipment. Therefore, the present invention has an extremely great practical value as a metal carrier that eliminates the conventional problems.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing another embodiment.

FIG. 3 is a partially cutaway front view showing a step of press-fitting a honeycomb body into an outer cylinder.

FIG. 4 is a perspective view showing an example of a honeycomb body.

[Explanation of symbols]

 1 Honeycomb body 2 Outer cylinder 4 Chamfer

Claims (1)

[Scope of utility model registration request] 1. A metal carrier in which a honeycomb body (1) in which flat plates and corrugated plates made of heat-resistant metal are alternately stacked or wound after being stacked is housed in an outer cylinder (2) made of heat-resistant metal. A metal carrier, characterized in that a taper-shaped chamfer (4) for assisting insertion of a honeycomb body is provided on at least one inner peripheral surface of the outer cylinder (2) so as to gradually expand toward the edge.