JP2015169167A - Electrically heated catalyst device and manufacturing method of same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically heated catalyst device and a manufacturing method of the same capable of suppressing the protrusion of a holding member from a carrier end surface due to press-fitting and ensuring excellent product yield.SOLUTION: An electrically heated catalyst device comprises: a carrier 10 carrying a catalyst; a pair of surface electrodes 20 formed on an outer circumferential surface of the carrier 10 to face each other; a wiring member 30 fixed to each of the surface electrodes 20; an outer casing 70 covering the outer circumferential surface of the carrier 10 and including an opening portion 71 provided on a side surface thereof for drawing out the wiring member 30 to outside; and a holding member 50 filled between the carrier 10 and the outer casing 70 and holding the carrier 10, the carrier 10 being electrically heated via the wiring member 30. A protrusion 60 is provided on the outer circumferential surface on one end of the carrier 10 for restricting the deviation of the holding member 50.

Description

  The present invention relates to an electrically heated catalyst device and a manufacturing method thereof.

  2. Description of the Related Art In recent years, an electrically heated catalyst (EHC) device has attracted attention as an exhaust purification device that purifies exhaust gas discharged from an engine such as an automobile. In EHC, even if the exhaust gas temperature is low, such as immediately after the engine is started, and the catalyst is difficult to activate, the catalyst is forcibly activated by energization heating to increase the exhaust gas purification efficiency. Can do.

  In the EHC disclosed in Patent Document 1, a surface electrode extending in the axial direction of the carrier is formed on the outer peripheral surface of a cylindrical carrier having a honeycomb structure carrying a catalyst such as platinum or palladium. Then, comb-like wiring is connected to the surface electrode, and current is supplied. When this current spreads in the direction of the carrier axis in the surface electrode, the whole carrier is heated by energization. As a result, the catalyst supported on the carrier is activated, and unburned HC (hydrocarbon), CO (carbon monoxide), NOx (nitrogen oxide), etc. in the exhaust gas passing through the carrier are purified by the catalytic reaction. The

JP 2012-066188 A

The inventor has found the following problems with respect to the above-mentioned current heating type catalyst device and the manufacturing method thereof.
FIG. 14 is a view for explaining the problem of the present invention, and is a longitudinal sectional view showing an example of the configuration of a conventional electrically heated catalyst device. As shown in FIG. 14, in this electrically heated catalyst device, the carrier 10 having a pair of surface electrodes 20 arranged on the outer peripheral surface is covered with an outer cylinder 70 via a mat (holding member) 50. ing. A plurality of comb-like wirings 31 are fixed on each surface electrode 20. An opening 51 is provided in the mat 50 in a region where the comb-like wiring 31 is disposed on the surface electrode 20.

  In such an electrically heated catalyst device, the outer peripheral surface of the carrier 10 on which the surface electrode 20 and the comb-like wiring 31 are formed is covered with the mat 50, and this is press-fitted in the axial direction from one end side of the outer cylinder 70. Manufactured. FIG. 14 shows a state in which the carrier 10 covered with the mat 50 is press-fitted in the y-axis plus direction (downward in the drawing) with respect to the outer cylinder 70. Here, in the conventional electrically heated catalyst device, as shown in FIG. 14, the mat 50 may be displaced during press-fitting and may protrude from the rear end surface of the carrier 10 in the press-fitting direction. In such a case, the protruding mat 50 is exposed to the high-temperature exhaust gas that has passed through the carrier 10 and the emission characteristics are deteriorated. Therefore, the conventional electrically heated catalyst device has a problem that the product yield is inferior.

  The present invention has been made in view of the above, and it is an object of the present invention to provide an electrically heated catalyst device and a method for manufacturing the same, in which the protrusion of the holding member from the end surface of the carrier due to press-fitting is suppressed and the product yield is excellent. .

The electrically heated catalyst device according to one aspect of the present invention is
A carrier carrying a catalyst;
A pair of surface electrodes formed to face each other on the outer peripheral surface of the carrier;
A wiring member fixed to each of the surface electrodes;
An outer cylinder that covers the outer peripheral surface of the carrier and has an opening on the side surface for pulling out the wiring member to the outside;
A holding member that is filled between the carrier and the outer cylinder and holds the carrier;
An electrically heated catalyst device in which the carrier is energized and heated through the wiring member,
On the outer peripheral surface of one end of the carrier, there is a protrusion for regulating the displacement of the holding member.
Since the electrically heated catalyst device according to one aspect of the present invention has a protrusion on the outer peripheral surface of one end of the carrier that restricts the displacement of the holding member, the protrusion of the holding member from the end surface of the carrier due to press-fitting is suppressed, and the product Excellent yield.
It is preferable that the protrusion is provided on an extension of the surface electrode extending in the axial direction of the carrier. Moreover, it is preferable that both the protrusion and the surface electrode are composed of a thermal spray coating. With such a configuration, the protrusion can be formed simultaneously with the surface electrode.

The holding member is a single sheet-like member wound around the outer peripheral surface of the carrier, and has unevenness formed on each of two end surfaces that abut each other, and the unevenness is fitted to each other. Is preferred. With such a configuration, the sealing performance by the holding member can be improved.
Furthermore, it is preferable that a notch portion is formed on the projection side of the convex portion located closest to the projection side in the fitted unevenness. With such a configuration, it is possible to effectively suppress the protrusion of the convex portion located closest to the protrusion side.

A method for producing an electrically heated catalyst device according to an aspect of the present invention includes:
Forming a pair of surface electrodes opposite to the outer peripheral surface of the carrier carrying the catalyst;
Fixing a wiring member to each of the surface electrodes;
Covering the outer peripheral surface of the carrier to which the wiring member is fixed with a holding member for holding the carrier;
A step of press-fitting the carrier covered with the holding member into an outer cylinder, and a method for producing an electrically heated catalyst device comprising:
Prior to the step of press-fitting the carrier into the outer cylinder, a protrusion for restricting the displacement of the holding member is formed on the outer peripheral surface at the rear end in the press-fitting direction of the carrier.
In the method for manufacturing an electrically heated catalyst device according to one aspect of the present invention, a protrusion that restricts the displacement of the holding member is formed on the outer peripheral surface of the rear end in the press-fitting direction of the carrier. The protrusion of the holding member is suppressed, and the product yield is excellent.

  According to the present invention, it is possible to provide an electrically heated catalyst device and a method for manufacturing the same, in which the protrusion of the holding member from the end face of the carrier due to the press-fitting is suppressed and the product yield is excellent.

1 is a perspective view of an electrically heated catalyst device according to a first embodiment. It is the perspective view which removed the outer cylinder 70 in FIG. FIG. 3 is a plan view seen from directly above a surface electrode 20 in FIG. 2. FIG. 4 is a transverse sectional view taken along the line IV-IV in FIG. 3. It is a cross-sectional view for demonstrating the manufacturing method of the electrically heated catalyst apparatus which concerns on 1st Embodiment. It is a side view for demonstrating the manufacturing method of the electricity heating type catalyst apparatus which concerns on 1st Embodiment. It is an expanded view of the mat 50 which concerns on 1st Embodiment. FIG. 6 is a longitudinal sectional view showing how the carrier 10 is press-fitted into the outer cylinder 70. 4 is a longitudinal sectional view showing a state after the carrier 10 is press-fitted into the outer cylinder 70. FIG. It is an end view of the electric heating type catalyst apparatus which concerns on the modification of 1st Embodiment. It is an end view of an electrically heated catalyst device according to another modification of the first embodiment. It is a side view for demonstrating the manufacturing method of the electrically heated catalyst apparatus which concerns on 2nd Embodiment. It is an expanded view of the mat 50 which concerns on 2nd Embodiment. It is a figure for demonstrating the subject of this invention, Comprising: It is a longitudinal cross-sectional view which shows an example of a structure of the conventional electrically-heating catalyst apparatus.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiment. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate.

(First embodiment)
First, with reference to FIGS. 1-4, the electroheating type catalyst apparatus which concerns on 1st Embodiment is demonstrated. FIG. 1 is a perspective view of an electrically heated catalyst device according to the first embodiment. FIG. 2 is a perspective view with the outer cylinder 70 removed in FIG. FIG. 3 is a plan view as viewed from directly above the surface electrode 20 in FIG. 2 (plus side in the x-axis direction). 4 is a cross-sectional view taken along the line IV-IV in FIG.

  As a matter of course, the right-handed xyz coordinates shown in the drawings are for convenience in explaining the positional relationship between the components. The xyz coordinates in each drawing are common, and the y-axis direction is the axial direction of the carrier 10. Here, when using the electrically heated catalyst device 100, it is preferable to match the positive z-axis direction with the upward vertical direction as shown in FIG.

  The electrically heated catalyst device 100 is provided on an exhaust path of an automobile or the like, for example, and purifies exhaust gas discharged from the engine. As shown in FIG. 1, the electrically heated catalyst device 100 includes a carrier 10 and an outer cylinder 70. As shown in FIG. 2, the electrically heated catalyst device 100 includes a surface electrode 20, a wiring member 30, a fixed layer 40, and a stopper 60 on the outer peripheral surface of the carrier 10. Furthermore, as shown in FIGS. 3 and 4, the electrically heated catalyst device 100 includes a mat 50 between the carrier 10 and the outer cylinder 70. That is, the electrically heated catalyst device 100 includes the carrier 10, the surface electrode 20, the wiring member 30, the fixed layer 40, the mat 50, the stopper 60, and the outer cylinder 70.

  In FIG. 1, the mat 50 is omitted. 3 shows the positional relationship between the carrier 10, the wiring member 30, the fixing layer 40, the mat 50, and the stopper 60 for one surface electrode 20, but the same applies to the other surface electrode 20. . Specifically, as shown in FIGS. 2 and 4, the two surface electrodes 20 are in a mirror-symmetrical positional relationship with respect to a symmetry plane parallel to the yz plane.

  The carrier 10 is a porous member that supports a catalyst such as platinum or palladium. Further, since the carrier 10 itself is energized and heated, it is preferable that the carrier 10 is made of conductive ceramics, specifically, for example, SiC (silicon carbide). As shown in FIG. 2, the carrier 10 has a substantially cylindrical shape and has a honeycomb structure inside. As indicated by the white arrow, the exhaust gas passes through the inside of the carrier 10 in the axial direction (y-axis direction) of the carrier 10.

  As shown in FIG. 2, the surface electrode 20 is a pair of electrodes that are formed on the outer peripheral surface of the carrier 10 and arranged to face each other via the carrier 10. The surface electrode 20 is in physical contact with and electrically connected to the carrier 10. As shown in FIG. 3, each surface electrode 20 has a rectangular planar shape and extends in the carrier axis direction (y-axis direction). Further, as shown in FIG. 4, the surface electrode 20 is electrically connected to the battery 83 via the wiring member 30, the external electrode 81, and the external wiring 82. With such a configuration, a current is supplied to the carrier 10 and is heated by energization. One of the pair of surface electrodes 20 is a positive electrode and the other is a negative electrode. However, any surface electrode 20 may be a positive electrode or a negative electrode. That is, the direction of the current flowing through the carrier 10 is not limited.

  The surface electrode 20 is a sprayed coating having a thickness of about 50 to 200 μm formed by plasma spraying, for example. Since the surface electrode 20 is energized in the same manner as the wiring member 30, this thermal spray coating needs to be a metal base. The metal constituting the matrix of the thermal spray coating is a Ni-Cr alloy having excellent oxidation resistance at high temperatures in order to withstand use at high temperatures of 800 ° C. or higher (however, the Cr content is 20 to 60% by mass) ), MCrAlY alloy (where M is at least one of Fe, Co and Ni). Here, the NiCr alloy and MCrAlY alloy may contain other alloy elements.

  As shown in FIG. 3, the wiring member 30 is disposed on each surface electrode 20. As shown in FIG. 3, the wiring member 30 has a comb-like wiring 31 extending in the carrier circumferential direction on the surface electrode 20 and a lead portion 32 connected to the external electrode 81 (FIG. 4). Yes. The entire wiring member 30 is a thin metal plate having a thickness of about 0.1 mm, for example. The width of the comb-like wiring 31 is, for example, about 1 mm. In addition, the wiring member 30 is preferably made of a heat-resistant (oxidation-resistant) alloy such as a stainless-based alloy, a Ni-based alloy, or a Co-based alloy in order to endure use at a high temperature of 800 ° C. or higher. In consideration of performance and cost such as electrical conductivity, heat resistance, oxidation resistance at high temperature, and corrosion resistance in an exhaust gas atmosphere, stainless steel alloys are preferable.

  As shown in FIG. 3, the plurality of comb-like wirings 31 extend in the carrier circumferential direction over substantially the entire region where the surface electrode 20 is formed, and extend along the carrier axis direction (y-axis direction). Are arranged at approximately equal intervals. Further, all the comb-like wirings 31 are connected to the lead portion 32 on the plus side in the z-axis direction of the formation region of the surface electrode 20. In the example of FIG. 3, twelve comb-like wirings 31 are provided on the surface electrode 20. Each of the comb-like wirings 31 is fixed to the surface electrode 20 by the fixing layer 40 and is electrically connected. As a matter of course, the number of the comb-like wirings 31 is not limited to 12 and is appropriately determined.

  The lead portion 32 is not fixed to the surface electrode 20 and is drawn to the outside of the outer cylinder 70. Here, the drawer | drawing-out part 32 has a some bending part, and is formed so that expansion-contraction is possible. That is, the drawer part 32 is formed in a bellows shape. In the example of the drawing, as shown in FIG. 4, for example, the lead-out portion 32 has three bent portions (two mountain folds and one valley fold when viewed from the positive side in the z-axis direction) and is formed in an M-shaped cross section. Has been. The lead portion 32 may have two bent portions (one mountain fold and one valley fold), and may be formed in an N-shaped cross section. Furthermore, the drawer | drawing-out part 32 may have four or more bending parts.

  The bellows-like drawer 32 is in a folded state at the manufacturing stage. Therefore, the lead portion 32 of the wiring member 30 and the outer cylinder 70 do not interfere with each other, and the carrier 10 including the wiring member 30 can be press-fitted into the outer cylinder 70. Then, after the carrier 10 is press-fitted into the outer cylinder 70, the drawer portion 32 can be easily pulled out to the outside of the outer cylinder 70. Here, by using an annealed material (elongation of 15% or more) obtained by annealing a cold-rolled thin plate as the wiring member 30, the lead-out portion 32 can be easily folded into a bellows shape.

  The fixed layer 40 is a button-shaped sprayed coating having a thickness of about 300 to 500 μm formed on the comb-like wiring 31. The fixed layer 40 can be formed by disposing the wiring member 30 on the surface electrode 20, disposing the masking jig jig thereon, and performing plasma spraying. The composition of the thermal spray coating may be the same as that of the surface electrode 20 described above.

  As described above, the comb-like wiring 31 is fixed to the surface electrode 20 and electrically connected by the fixing layer 40. In the example of FIG. 3, all the comb-like wirings 31 are respectively fixed to the surface electrode 20 by two fixing layers 40 provided apart from each other. In other words, the comb-like wiring 31 is not fixed to the surface electrode 20 between the adjacent fixed layers 40. With such a configuration, thermal strain (thermal stress) based on a difference in linear expansion coefficient between the surface electrode 20 and the fixed layer 40, which are metal-based thermal spray coatings, and the carrier 10 made of ceramics can be relaxed. That is, the thermal strain (thermal stress) is alleviated by making the individual fixed layers 40 as small as possible and interspersed. Note that the number and interval of the fixed layers 40 to be arranged may be determined as appropriate.

  The mat (holding member) 50 is a heat insulating member having flexibility. The mat 50 is wound around the entire outer peripheral surface of the carrier 10 as shown by a broken line in FIG. 3, and is filled between the carrier 10 and the outer cylinder 70 as shown in FIG. The mat 50 fixes and holds the carrier 10 to the outer cylinder 70 and seals the exhaust gas so that it does not leak out of the outer cylinder 70.

  As shown in FIGS. 3 and 4, the mat 50 is provided with two openings 51 for leading the lead-out portion 32 of the wiring member 30 to the outside of the outer cylinder 70. As shown in FIG. 3, the opening 51 is formed in a rectangular shape in the central portion in the axial direction of the carrier 10 corresponding to the position where the wiring member 30 is formed. Further, in the cross-sectional view shown in FIG. 4, the two openings 51 are arranged in mirror symmetry with respect to a symmetry plane parallel to the yz plane. In order to ensure sealing performance, the frame width w of the opening 51 in the y-axis direction shown in FIG. 3 is preferably 30 mm or more. In the example of the drawing, the shape of the opening 51 is rectangular, but is not particularly limited. For example, the shape of the opening 51 may be a circular shape or an elliptical shape.

  The stopper 60 is a protrusion formed on the outer peripheral surface of the rear end of the carrier 10 in the press-fitting direction in order to regulate the displacement of the mat 50 covering the carrier 10. The height of the stopper 60 is preferably 1 mm or more. The stopper 60 can suppress the protrusion of the mat 50 from the end surface of the carrier 10 due to the press-fitting. Therefore, the deterioration of the emission characteristics due to the exposed mat 50 being exposed to high-temperature exhaust gas can be suppressed. Therefore, the electric heating catalyst device according to the present embodiment improves the product yield as compared with the conventional electric heating catalyst device.

  The stopper 60 can be formed from a sprayed coating similar to the surface electrode 20 and the fixed layer 40, for example. In the example of the drawing, two stoppers 60 are respectively formed on the longitudinal extension (y-axis direction) of the surface electrode 20. Therefore, when the surface electrode 20 and the fixed layer 40 are formed by thermal spraying, the stopper 60 can be formed at the same time. That is, it is not necessary to provide a new process for forming the stopper 60. The stopper 60 may be formed integrally with the carrier 10. That is, the stopper 60 may also be made of ceramics having the same conductivity as the carrier 10.

  The outer cylinder 70 is a casing for housing the carrier 10 and is a pipe having a diameter that is slightly larger than that of the columnar carrier 10. As shown in FIG. 1, the outer cylinder 70 covers substantially the entire carrier 10 via a mat 50. Here, the outer cylinder 70 is preferably made of a metal such as a stainless alloy.

  As shown in FIGS. 1 and 4, the side surface of the outer cylinder 70 is provided with an opening 71 for leading the lead-out portion 32 of the wiring member 30 to the outside of the outer cylinder 70. Therefore, as shown in FIG. 1, the opening 71 is provided at two locations in the central portion of the outer cylinder 70 in the axial direction corresponding to the position where the drawing portion 32 is formed. Further, in the cross-sectional view shown in FIG. 4, the two openings 71 are arranged mirror-symmetrically with respect to a plane parallel to the yz plane, slightly above the center portion (z-axis direction plus side). In the example of the drawing, the shape of the opening 71 is circular, but is not particularly limited. For example, the shape of the opening 71 may be an elliptical shape or a rectangular shape.

  With the above configuration, in the electrically heated catalyst device 100, the carrier 10 is electrically heated between the pair of surface electrodes 20, and the catalyst supported on the carrier 10 is activated. Thereby, unburned HC (hydrocarbon), CO (carbon monoxide), NOx (nitrogen oxide) and the like in the exhaust gas passing through the carrier 10 are purified by the catalytic reaction.

  As described above, the electrically heated catalyst device 100 according to the first embodiment includes the stopper 60 on the outer peripheral surface of one end of the carrier 10 for regulating the displacement of the mat 50 covering the carrier 10. Therefore, the deterioration of the emission characteristics due to the mat 50 protruding from the end face of the carrier 10 being exposed to high-temperature exhaust gas can be effectively suppressed. Therefore, the electrically heated catalyst device according to the present embodiment is excellent in product yield.

  Next, with reference to FIGS. 5-9, the manufacturing method of the electrically heated catalyst apparatus 100 which concerns on 1st Embodiment is demonstrated. FIG. 5 is a cross-sectional view for explaining the method for manufacturing the electrically heated catalyst device according to the first embodiment. FIG. 5 corresponds to the cross-sectional view of FIG. FIG. 6 is a side view for explaining the method for manufacturing the electrically heated catalyst device according to the first embodiment.

  First, as shown in FIG. 5, the surface electrode 20 is formed on the surface of the carrier 10 by, for example, plasma spraying. Subsequently, the wiring member 30 in which the lead portion 32 is folded in a bellows shape is disposed on the surface electrode 20, and the fixed layer 40 is formed on the wiring member 30 by plasma spraying using a masking jig. Thereby, the wiring member 30 is fixed on the surface electrode 20. Here, when the surface electrode 20 and the fixed layer 40 are formed, the stopper 60 is also formed by plasma spraying. As described above, the carrier 10 in which the stopper 60 is integrally formed may be used. As a matter of course, the stopper 60 is formed before the press-fitting process described later.

  Next, as shown in FIGS. 5 and 6, an opening 51 corresponding to the formation region of the wiring member 30 is provided on the outer peripheral surface of the carrier 10 on which the surface electrode 20, the wiring member 30, and the fixing layer 40 are formed. The mat 50 is wound. Here, as shown in FIG. 5, the lead-out portion 32 remains folded in a bellows shape.

  FIG. 7 is a development view of the mat 50 according to the first embodiment. As shown in FIG. 7, the mat 50 is a single sheet-like member, and is provided with a convex portion 52 and a concave portion 53 on each butt end surface. By winding the sheet-like mat 50 shown in FIG. 7 on the outer peripheral surface of the carrier 10 and fitting the convex portion 52 formed on one butt end surface and the concave portion 53 formed on the other butt end surface, FIG. A cylindrical mat 50 shown in FIG. Thus, the sealing performance by the mat 50 can be improved by forming irregularities on each of the two butted end faces and fitting the irregularities together.

  Next, as shown in FIG. 8, the carrier 10 around which the mat 50 is wound is press-fitted into the outer cylinder 70. FIG. 8 is a longitudinal sectional view showing a state in which the carrier 10 is press-fitted into the outer cylinder 70. As shown in FIG. 8, a ring-shaped press-fit guide 90 is installed at the upper end (end on the negative side in the y-axis direction) of the outer cylinder 70. In order to press-fit the carrier 10 around which the mat 50 is wound from the upper side of the press-fit guide 90 (minus side in the y-axis direction), the inner peripheral surface of the press-fit guide 90 has a tapered shape that expands in the upward direction (minus direction of the y-axis). doing. A step for fitting with the outer cylinder 70 is provided at the lower end (end on the positive side in the y-axis direction) of the inner peripheral surface of the press-fitting guide 90.

  FIG. 9 is a longitudinal sectional view showing a state after the carrier 10 is press-fitted into the outer cylinder 70. As shown in FIG. 9, the stopper 60 provided on the outer peripheral surface of the rear end of the carrier 10 in the press-fitting direction suppresses the mat 50 from protruding from the end surface at the rear of the carrier 10 in the press-fitting direction. As shown in FIGS. 8 and 9, when the carrier 10 is press-fitted into the outer cylinder 70, it is preferable that the axial direction (y-axis direction) of the carrier 10 coincides with the vertical direction.

Next, the drawer portion 32 folded in a bellows shape is stretched to pull out the drawer portion 32 to the outside of the outer cylinder 70 through the opening 71.
Finally, the lead portion 32 is fixed to the external electrode 81 by screwing or welding.
Through the above steps, as shown in FIG. 4, the electrically heated catalyst device 100 according to the first embodiment can be obtained.

(Modification of the first embodiment)
Next, with reference to FIG. 10 and FIG. 11, the electric heating type catalyst apparatus which concerns on the modification of 1st Embodiment is demonstrated. FIG. 10 is an end view of an electrically heated catalyst device according to a modification of the first embodiment. FIG. 11 is an end view of an electrically heated catalyst device according to another modification of the first embodiment. 10 and 11 show only the positional relationship between the carrier 10, the mat 50, and the stopper 60 as seen from the rear end side (y-axis direction minus side) of the carrier 10 in the press-fitting direction.

  In the electrically heated catalyst device according to the first embodiment shown in FIG. 1 and the like, the stoppers 60 are formed at two locations on the longitudinal extension of the surface electrode 20. However, the number of stoppers 60 is not limited to two. For example, as shown in FIG. 10, four stoppers 60 may be provided at equal intervals on the outer peripheral surface of the rear end of the carrier 10 in the press-fitting direction. Alternatively, as shown in FIG. 11, the stopper 60 may be provided in a flange shape over the entire outer peripheral surface of the rear end of the carrier 10 in the press-fitting direction.

(Second Embodiment)
Next, with reference to FIG. 12, FIG. 13, the electric heating type catalyst apparatus which concerns on 2nd Embodiment is demonstrated. FIG. 12 is a side view for explaining the method for manufacturing the electrically heated catalyst device according to the second embodiment. FIG. 13 is a development view of the mat 50 according to the second embodiment.

  As shown in FIG. 6, in the electrically heated catalyst device according to the first embodiment, the stopper 60 is not provided at a portion where the two butted end surfaces of the mat 50 are butted. Therefore, the convex portion 52 located closest to the stopper 60 may be displaced by press-fitting and protrude from the end surface of the carrier 10.

  On the other hand, as shown in FIGS. 12 and 13, in the electrically heated catalyst device according to the second embodiment, when the two butted end faces of the mat 50 are butted, the convexity that is located closest to the stopper 60 side. A cutout portion 54 is provided on the stopper 52 side of the portion 52. Therefore, as shown by a broken line in FIG. 12, even if the convex portion 52 positioned closest to the stopper 60 is displaced by press-fitting, the carrier 10 does not protrude from the rear end surface in the press-fitting direction.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Carrier 20 Surface electrode 30 Wiring member 31 Comb-shaped wiring 32 Lead part 40 Fixed layer 50 Mat 51 Opening part 52 Protruding part 53 Recessing part 54 Notch part 60 Stopper 70 Outer cylinder 71 Opening part 81 External electrode 82 External wiring 83 Battery 90 Press fitting Guide 100 Electric heating type catalytic device

Claims (6)

A carrier carrying a catalyst;
A pair of surface electrodes formed to face each other on the outer peripheral surface of the carrier;
A wiring member fixed to each of the surface electrodes;
An outer cylinder that covers the outer peripheral surface of the carrier and has an opening on the side surface for pulling out the wiring member to the outside;
A holding member that is filled between the carrier and the outer cylinder and holds the carrier;
An electrically heated catalyst device in which the carrier is energized and heated through the wiring member,
On the outer peripheral surface of one end of the carrier, there is a protrusion that regulates the displacement of the holding member,
Electric heating type catalytic device. The protrusion is provided on an extension of the surface electrode extending in the axial direction of the carrier;
The electrically heated catalyst device according to claim 1. The protrusion and the surface electrode are both composed of a thermal spray coating.
The electrically heated catalyst device according to claim 1 or 2. The holding member is a sheet-like member wound around the outer peripheral surface of the carrier,
In the holding member, an unevenness is formed on each of the two end surfaces that abut each other, and the unevenness is fitted.
The electrically heated catalyst device according to any one of claims 1 to 3. A notch portion is formed on the projection side of the convex portion located closest to the projection side in the concave and convex portions fitted.
The electrically heated catalyst device according to claim 4. Forming a pair of surface electrodes opposite to the outer peripheral surface of the carrier carrying the catalyst;
Fixing a wiring member to each of the surface electrodes;
Covering the outer peripheral surface of the carrier to which the wiring member is fixed with a holding member for holding the carrier;
A step of press-fitting the carrier covered with the holding member into an outer cylinder, and a method for producing an electrically heated catalyst device comprising:
Before the step of press-fitting the carrier into the outer cylinder, a protrusion that restricts the displacement of the holding member is formed on the outer peripheral surface at the rear end in the press-fitting direction of the carrier.
A method for producing an electrically heated catalyst device.

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