JP6597438B2 - Exhaust purification device mounting structure - Google Patents

Description

  The present invention relates to an exhaust purification device mounting structure that fixes a cylindrical exhaust purification device that purifies exhaust exhausted from an engine to an attachment target.

  2. Description of the Related Art As an exhaust purification device that purifies exhaust from an engine, a cylindrical exhaust purification device that has a filter for capturing particulates inside is known (for example, Patent Document 1). The cylindrical case constituting the outer shell of this type of exhaust gas purification apparatus is thin. For this reason, for example, when the case is attached to the attachment target with a simple L-shaped bracket welded to the outer peripheral surface of the case, stress due to vibration concentrates on the welded portion of the bracket, and the case is likely to crack.

  In the exhaust emission control device disclosed in Patent Document 1, the case is attached to an attachment object such as a support bracket at two locations separated in the axial direction of the case. At one attachment location, a support plate is attached to a part of the flange formed along the outer peripheral surface of the case, and the support plate is fixed to the support bracket. At the other mounting location, the U-bolt is locked to the case, and the U-bolt is fixed to the support bracket.

Japanese Patent No. 4972228

  By the way, as a structure for fixing an exhaust purification device in a large displacement type engine such as an engine for construction machinery, a U-bolt is used as in the past, and a cylindrical case of the exhaust purification device is attached to a support bracket fixed to the engine. When the mounting structure is adopted, the exhaust purification device is heavy and the vibration from the engine is large, so that the exhaust purification device cannot be mounted stably due to insufficient mounting strength. There is a fear.

  An object of the present invention is to provide an exhaust purification device mounting structure that can securely fix an exhaust purification device having a cylindrical case as an outer shell to an attachment object while suppressing cracks in the case. There is.

  In order to solve the above problems, the present invention takes the following means.

  A first aspect of the present invention is an exhaust purification device mounting structure in which a cylindrical case is used as an outer shell and an exhaust purification device for purifying exhaust exhausted by an engine is fixed to an object to be mounted. At least one attachment body attached to the housing. The mounting body has a mounting width in the direction of the case axis, which is the axis of the case, and an overhanging portion that protrudes outward from the outer peripheral surface of the case, and an end portion that is located on the outer peripheral surface of the case in the overhanging portion. And two extensions extending from one base end to both sides in the circumferential direction of the case. The overhang portion has a fixing portion for attaching the attachment body to the attachment object. Each of the extended portions has a front end side that is a front end in the extending direction from the base end portion, and two opposing sides that are located between the front end side and the base end portion and face each other. It is configured in shape. In each extension, the tip side has a tip side welded portion that is a welded portion with the outer peripheral surface of the case. In each extension part, each opposing side has an opposing side welding part which is a welding part with the outer peripheral surface of a case.

  The second invention of the present invention is the exhaust emission control device mounting structure described in the first invention, wherein a plurality of mounting bodies are provided on the outer peripheral surface of the case. The plurality of attachments are arranged at least one each in the first region and the second region that are set across the axial virtual plane that is a virtual plane that passes through the case axis and extends in the direction of gravity on the outer peripheral surface of the case. Has been.

  A third invention of the present invention is the exhaust emission control device mounting structure described in the first invention or the second invention, and the mounting body includes a first mounting body and a second mounting body. The first mounting body has a mounting width in the direction of the case axis and extends outward from the outer peripheral surface of the case, and the first mounting body extends from an end located on the outer peripheral surface of the case at the first protruding portion. A first extension extending in a rectangular shape toward one side of the direction. The second mounting body has a mounting width in the direction of the case axis and extends outwardly from the outer peripheral surface of the case, and the second extended body from the end located on the outer peripheral surface of the case at the second protruding portion. A second extension portion extending in a rectangular shape in the circumferential direction opposite to the one side. The overhanging portion of the attachment body is in a state where the first overhanging portion and the second overhanging portion are butted against each other in the circumferential direction. The extension part of the attachment body is formed of a first extension part and a second extension part.

  In the first invention, the case of the exhaust emission control device can be stably attached and fixed to the attachment object via the attachment body having the welded portion with the outer peripheral surface of the cylindrical case. The cylindrical case constituting the exhaust emission control device has a low strength with respect to a tensile force (tensile stress), but has a high strength with respect to a compressive force (compressive stress). Therefore, in the first invention, a structure is adopted in which the tensile stress is not concentrated on a specific welded portion with respect to the load acting on the attachment body fixed to the case by welding. For example, as shown in FIG. 6, when a load F1 along the circumferential direction of the case acts on the fixed portion of the mounting body, the load is compressed by a welded portion 68a set in one extension portion. Since it receives as stress, a big tensile stress does not concentrate on the welding part of the code | symbol 78a set to the other extension part. Further, as shown in FIG. 7, when a load F2 along the direction of the case axis acts on the fixed portion of the mounting body, the load is set to the reference numeral 68b set on one end side of the extension portion in the case axis direction. , 78b is received as a compressive stress at the welded portion of 78b, so that a large tensile stress is not concentrated on the welded portion of reference numerals 68c, 78c set on the other side in the case axial direction of the extended portion. Thus, it is prevented that a crack arises in a case by making the load which acts on the attachment body welded to the case not concentrate as a tensile stress in a specific welding part.

  In the second aspect of the invention, a structure is employed in which tensile stress is not concentrated on a specific welded portion with respect to a radial load acting on an attachment body fixed to the case by welding. As shown in FIG. 8, when the load F3 along the radial direction of the case acts on the fixing portion of the mounting body (when the load F3 acts on the mounting body of reference numerals 50A and 50B from the mounting object of reference numeral 150), In order to receive a load as compressive stress at each welded portion of the one attachment body (reference numeral 50B) provided across the axis imaginary plane of reference S, the other attachment body provided with the axis imaginary plane (reference numeral 50B). 50A) does not concentrate a large tensile stress on each weld. Thus, it is prevented that a crack arises in a case by making the load which acts on the attachment body welded to the case not concentrate as a tensile stress in a specific welding part.

  In 3rd invention, the attachment body is comprised by the 1st attachment body and 2nd attachment body of the simple shape comprised by the overhang | projection part and the extension part bent with respect to the overhang | projection part. Therefore, the structure of the mounting body is simple.

It is a perspective view of an engine unit. It is sectional drawing of the II-II arrow direction of FIG. It is the perspective view which expanded and represented the III area | region of FIG. FIG. 4 is a cross-sectional view illustrating an enlarged IV region in FIG. 2. FIG. 5 is a front view of an outer peripheral surface stay as seen from the direction of arrow V in FIG. 4. It is explanatory drawing showing the example when the load to a Z-axis direction acted on the stay for 1st outer peripheral surfaces. It is explanatory drawing showing the example at the time of the load to a X-axis direction acting on the stay for 1st outer peripheral surfaces. It is explanatory drawing showing the example when the load to a Y-axis direction worked to the stay for outer peripheral surfaces. FIG. 5 is a cross-sectional view illustrating a change example of the outer peripheral surface stay in correspondence with FIG. 4.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. An engine unit 1 shown in FIG. 1 is provided as a drive source of a power shovel that is a construction machine, for example. The engine unit 1 includes an engine 10, an electric motor 20 provided integrally with the engine 10, and an exhaust purification device 30 provided above the electric motor 20. The exhaust purification device 30 purifies exhaust from the engine 10. In each drawing, the X axis, the Y axis, and the Z axis are orthogonal to each other, and the direction indicated by the Z axis corresponds to the upper side. The X-axis direction corresponds to the case axis J direction described later.

  As shown in FIG. 1, the exhaust purification device 30 uses a cylindrical case 31 as an outer shell. The case 31 is thin as shown in FIG. The case 31 is attached to the attachment target member 150 (attachment target). As shown in FIG. 1, the case 31 includes a flange stay 42 and an outer peripheral surface stay 50 provided on an outer peripheral surface 32 (hereinafter referred to as “purifying device outer peripheral surface”) of the case 31. 150 is attached. The flange stay 42 and the outer peripheral surface stay 50 are provided apart from each other in the direction of the case axis J, which is the axis of the case 31. In the following description, the circumferential direction and the radial direction refer to the circumferential direction and the radial direction of the case 31, respectively. The circumferential direction of the case 31 is a direction along the outline of the case 31 when the case 31 is cut along an orthogonal virtual plane Q (see FIG. 1) that is a virtual plane orthogonal to the case axis J. The flange stay 42 is provided on the flange 34.

  As shown in FIG. 2, a plurality of outer peripheral stays 50 (attachment bodies) are provided on the outer peripheral surface 32 of the purification device (two in this embodiment). One outer circumferential surface stay 50 is arranged in each of the first region 31a and the second region 31b set on the outer peripheral surface 32 of the purification device. The first region 31a and the second region 31b sandwich an axis virtual plane S (see FIGS. 1 and 2) that is a virtual plane that passes through the case axis J and extends along the direction of gravity (the direction opposite to the direction indicated by the Z axis). This is the area set by. The first outer peripheral surface stay 50A (attachment body) and the second outer peripheral surface stay 50B (attachment body) are disposed at symmetrical positions with respect to the axis virtual plane S, and are disposed at the same position in the case axis J direction. Has been. Since the first outer peripheral surface stay 50A (attachment body) and the second outer peripheral surface stay 50B (attachment body) have the same configuration, the first outer peripheral surface stay 50A will be described below. The redundant description of the stay 50B is omitted. In FIG. 2, the internal structure of the case 31 is omitted.

  As shown in FIGS. 3 to 5, the first outer peripheral surface stay 50 </ b> A is provided only on a part of the purifier outer peripheral surface 32 without straddling the purifier outer peripheral surface 32 in the circumferential direction. The first outer circumferential surface stay 50A has a mounting width K in the case axis J direction (see FIG. 5) and a projecting portion 52 that projects in a plate shape from the outer circumferential surface 32 of the purification device radially outward. Two extension portions having a mounting width K in the direction (see FIG. 5) and extending in a plate shape from the base end portion 56 which is an end portion located on the purification device outer peripheral surface 32 in the overhang portion 52 to both sides in the circumferential direction 54a, 54b. The attachment width K is a dimension in the case axis line J direction of the overhang portion 52 and the extension portions 54a and 54b. Both extension portions 54a and 54b correspond to a first extension portion 64 and a second extension portion 74, which will be described later. In FIG. 3, only the exhaust purification device 30 and the first outer peripheral surface stay 50 </ b> A are shown, and the attachment target member 150 and the like are omitted.

  As shown in FIGS. 3 to 5, the overhanging portion 52 is in a state in which a first overhanging portion 62 and a second overhanging portion 72 described later are attached to each other in the circumferential direction. The overhang portion 52 is a hole H (fixed portion) through which the overhang portion 52 penetrates in the thickness direction, and has a hole portion H for attaching the first outer peripheral surface stay 50 </ b> A to the attachment target member 150. The hole H is composed of a first hole H1 and a second hole H2, which will be described later. The bolt B is inserted into the hole H and the hole 150H of the attachment target member 150, and the bolt B is fastened with the nut N, whereby the first outer peripheral surface stay 50A is attached to the attachment target member 150. ing. Note that the hole 150H is provided in the plate-like attached portion 150a in the attachment target member 150.

  As shown in FIGS. 3 to 5, the first outer peripheral surface stay 50 </ b> A includes a first constituent stay 60 (first mounting body) and a second constituent stay 70 (second mounting body). The first structural stay 60 has a mounting width K in the case axis J direction (see FIG. 5), a first projecting portion 62 projecting in a plate shape from the outer peripheral surface 32 of the purification device radially outward, and a case axis J A first extending in a rectangular plate shape from a first base end portion 66, which has an attachment width K in the direction and is located at the purifying device outer peripheral surface 32 in the first overhang portion 62, to one side in the circumferential direction. And an extension part 64. The first configuration stay 60 has an L-shaped end surface shape (a cross-sectional shape when cut along the orthogonal virtual plane Q (see FIG. 1)) when viewed from the direction of the case axis J. The part 62 and the first extension part 64 are substantially orthogonal. The 1st overhang | projection part 62 has the 1st hole H1 which the said 1st overhang | projection part 62 penetrated in the thickness direction.

  As shown in FIG. 5, the first extension portion 64 includes a first tip side 64 a (tip side) that is a tip in the extending direction from the first base end portion 66, a first tip side 64 a, and a first base end portion. 66, and two first opposing sides 64b and 64c (opposite sides) facing each other. The first tip side 64a has a first tip side welded portion 68a (tip side welded portion) that is a welded portion with the outer peripheral surface 32 of the purification device. The first opposed side 64b includes a first opposed side first welded portion 68b (opposed side welded portion) that is a welded portion with the outer peripheral surface 32 of the purification device. The first opposed side 64c includes a first opposed side second welded portion 68c (opposed side welded portion) that is a welded portion with the purification device outer peripheral surface 32. Each welding part 68a, 68b, 68c is provided only in a part of each corresponding side 64a, 64b, 64c. Each welded portion 68a, 68b, 68c may be provided over the entire area of each corresponding side 64a, 64b, 64c.

  The second constituent stay 70 (see FIGS. 3 to 5) includes a second projecting portion 72 having a mounting width K in the case axis J direction and projecting in a plate shape from the outer peripheral surface 32 of the purification device to the radially outer side. It has a mounting width K in the axis J direction and is rectangular in the circumferential direction opposite to the first extension 64 from the second base end 76, which is the end located on the purification device outer peripheral surface 32 in the second overhanging portion 72. And a second extension portion 74 extended in a plate shape. The second configuration stay 70 has an L-shaped end surface shape (a cross-sectional shape when cut along the orthogonal virtual plane Q (see FIG. 1)) when viewed from the case axis J direction. The portion 72 and the second extension portion 74 are substantially orthogonal. The 2nd overhang part 72 has the 2nd hole H2 which the 2nd overhang part 72 penetrated in the thickness direction. The axis and diameter of the second hole H2 coincide with the axis and diameter of the first hole H1, respectively.

  As shown in FIG. 5, the second extension 74 includes a second tip side 74 a (tip side) that is a tip in the extending direction from the second base end portion 76, a second tip side 74 a, and a second base end portion. And two second opposing sides 74b and 74c (opposite sides) that are positioned between and opposite to each other. The second tip side 74a has a second tip side welded portion 78a (tip side welded portion) that is a welded portion with the outer peripheral surface 32 of the purification device. The second opposed side 74b has a second opposed side first welded portion 78b (opposed side welded portion) that is a welded portion with the purification device outer peripheral surface 32. The second opposed side 74c has a second opposed side second welded portion 78c (opposed side welded portion) that is a welded portion with the purification device outer peripheral surface 32. Each welded part 78a, 78b, 78c is provided only in a part of each corresponding side 74a, 74b, 74c. Each welding part 78a, 78b, 78c may be provided over the whole region of each corresponding side 74a, 74b, 74c.

  For example, the case 31 vibrates with the operation of the construction machine and the like, and a load may act on the first outer peripheral surface stay 50 </ b> A via the bolt B. As will be described later, the first outer peripheral surface stay 50A is configured such that tensile stress is not concentrated on a specific welded portion with respect to a load in each direction.

  For example, as shown in FIG. 6, when a load F1 along the Z-axis direction acts on the first outer peripheral surface stay 50A, a tensile stress P1B (thick arrow) acts on the second tip side welded portion 78a. Then, the compressive stress P1A (thick arrow) acts on the first tip side welded portion 68a. When a large tensile stress is concentrated on the welded portion of the case 31, the thin-walled case 31 is weak against the tensile stress, so that the welded portion is easily damaged or the case 31 is easily deformed. On the other hand, when a large compressive stress is concentrated on the welded portion of the case 31, the thin case 31 has a high strength against the compressive stress, so that the welded portion is prevented from being damaged or deformed. Therefore, the compressive stress P1A is received by the case 31. As a result, the position of the first outer peripheral surface stay 50A is maintained, and the tensile stress P1B does not concentrate on the second distal end side welded portion 78a. Therefore, the case 31 is prevented from being cracked. When a load along the Z-axis direction is applied to the first outer peripheral surface stay 50A on the side opposite to the load F1, a compressive stress is applied to the second tip side welded portion 78a, whereby the first tip Tensile stress is not concentrated on the side weld 68a. Therefore, the case 31 is prevented from being cracked. The second outer peripheral surface stay 50B functions similarly to the first outer peripheral surface stay 50A with respect to a load along the Z-axis direction.

  As shown in FIG. 7, when the load F2 along the X-axis direction is applied to the first outer peripheral surface stay 50A, the first opposed-side second welded portion 68c and the second opposed-side second welded portion 78c. Tensile stress P2B (thick arrow) acts on the first, and compressive stress P2A (thick arrow) acts on the first opposed side first welded portion 68b and the second opposed side first welded portion 78b. As described above, since the case 31 has a high strength against the compressive stress, the compressive stress P2A is received by the case 31. As a result, the position of the first outer peripheral surface stay 50A is maintained, and the tensile stress P2B does not concentrate on the first opposed-side second welded portion 68c and the second opposed-side second welded portion 78c. Therefore, the case 31 is prevented from being cracked. When a load along the X-axis direction is applied to the first outer peripheral surface stay 50A on the opposite side to the load F2, the first opposed side second welded portion 68c and the second opposed side second welded portion 78c. As the compressive stress acts on the first, the tensile stress is not concentrated on the first opposed side first welded portion 68b and the second opposed side first welded portion 78b. Therefore, the case 31 is prevented from being cracked.

  As shown in FIG. 8, when a load F3 along the Y-axis direction is applied to both outer peripheral stays 50A and 50B (the load F3 is applied to both outer peripheral stays 50A and 50B from both attachment objects 150. In this case, a tensile stress P3B (thick arrow) acts on each welded portion 68a, 68b, 68c, 78a, 78b, 78c of the first outer peripheral surface stay 50A, and each weld of the second outer peripheral surface stay 50B. The compressive stress P3A (thick arrow) acts on the portions 68a, 68b, 68c, 78a, 78b, and 78c. As described above, since the case 31 has a high strength against the compressive stress, the compressive stress P3A is received by the case 31. As a result, the positions of the outer peripheral surface stays 50A and 50B are maintained, and the tensile stress P3B does not concentrate on the welded portions 68a, 68b, 68c, 78a, 78b, and 78c of the first outer peripheral surface stay 50A. Therefore, the case 31 is prevented from being cracked. When a load along the Y-axis direction is applied to both the outer peripheral surface stays 50A and 50B on the opposite side to the load F3, the welded portions 68a, 68b, 68c, and 78a of the first outer peripheral surface stay 50A. , 78b, 78c, the tensile stress does not concentrate on the welded portions 68a, 68b, 68c, 78a, 78b, 78c of the second outer peripheral surface stay 50B. Therefore, the case 31 is prevented from being cracked.

  Thus, in the above-described configuration, by using the outer peripheral surface stay 50 having a welded portion with the purifier outer peripheral surface 32, the case 31 is made using the purifier outer peripheral surface 32 without using a U-bolt. The case 31 can be attached to the attachment target member 150, and the case 31 is prevented from cracking due to the load applied to the case 31 via the outer peripheral surface stay 50. Note that the outer peripheral surface stay 50 is configured by two structural stays 60 and 70 having an L-shaped cross section, and thus has a simple configuration.

  The embodiments for carrying out the present invention have been described above with reference to the drawings. However, the present invention is not limited to the structure, configuration, appearance, shape, and the like described in the above embodiments. Various changes, additions, and deletions are possible without departing from the scope of the present invention. The case 31 is not limited to a cylindrical shape, and may be, for example, an elliptical cylindrical shape, a rectangular cylindrical shape (rectangular cylindrical shape), or the like as long as it is cylindrical. The fixing portion is not limited to the hole H, and may be any structure as long as it can be fixed to an attachment object such as a protrusion.

  The installation positions of the outer peripheral surface stays 50A and 50B are not limited to the positions shown in FIGS. The first outer peripheral surface stay 50A may be installed at any location in the first region 31a. The installation position of the second outer peripheral surface stay 50B may be any location in the second region 31b. Both the outer peripheral surface stays 50A and 50B do not have to be arranged at symmetrical positions with respect to the axis virtual plane S (see FIGS. 1 and 2). Both outer circumferential surface stays 50A and 50B may be arranged at positions shifted in the case axis J direction. One or more of the outer peripheral surface stays 50A and 50B may be provided in each of the first region 31a and the second region 31b, and a plurality of stays 50A and 50B may be provided.

  The stay 50 for the outer peripheral surface may be formed by integrally forming both the stays 60 and 70.

  The overhang direction of the overhang portion 52 (see FIG. 4) is not limited to the direction along the radial direction, and may be any direction as long as it is an outward direction with respect to the case 31 (see, for example, FIG. 9). ). The shape of both the constituent stays 60 and 70 (see FIG. 4) is not limited to the shape of the end face when viewed from the direction of the case axis J. For example, as in the first configuration stay 60a (see FIG. 9), the first projecting portion 62 is bent at an acute angle with respect to the first extension portion 64 in the end face shape when viewed from the case axis J direction. It may be in the shape. Further, as in the second configuration stay 70a (see FIG. 9), the second projecting portion 72 is a rectangular shape bent at an obtuse angle with respect to the first extension portion 74 in the end surface shape when viewed from the case axis J direction. But you can. In FIG. 9, parts that are considered to have the same or substantially the same configuration / function as those in FIGS. 1 to 8 are denoted by the same reference numerals as those in FIGS.

DESCRIPTION OF SYMBOLS 10 Engine 30 Exhaust gas purification device 31 Case 32 Purification device outer peripheral surface (outer peripheral surface)
50 Stay for outer peripheral surface (mounting body)
50A First outer peripheral stay (mounting body)
50B Second outer peripheral stay (mounting body)
52 Overhang portions 54a and 54b Extension portion 56 Base end portion 60 First configuration stay (first attachment body)
62 1st overhang | projection part 64 1st extension part 64a 1st front end side (front end side)
64b, 64c first opposing side (opposite side)
68a First tip side welded portion (tip side welded portion)
68b 1st opposing edge 1st welding part (facing edge welding part)
68c 1st opposing edge 2nd welding part (opposing edge welding part)
70 Second configuration stay (second mounting body)
72 2nd overhang | projection part 74 2nd extension part 74a 2nd front end side (front end side)
74b, 74c Second opposing side (opposite side)
78a Second tip side weld (tip side weld)
78b Second opposed side first welded portion (opposed side welded portion)
78c Second opposed side second welded portion (opposed side welded portion)
150 Mounting object (Mounting object)
S axis virtual plane Q orthogonal virtual plane H hole (fixed part)
J Case axis

Claims (1)

An exhaust purification device mounting structure for fixing an exhaust purification device that has a cylindrical case as an outer shell and purifies exhaust exhausted by an engine to an attachment object,
Having at least one attachment body attached to the outer peripheral surface of the case;
The mounting body has a mounting width in a direction of a case axis that is an axis of the case, and a projecting portion that projects outward from the outer peripheral surface of the case, and an outer peripheral surface of the case at the projecting portion Two extending portions extended from the base end portion, which is an end portion located on the both sides in the circumferential direction of the case,
The overhang portion has a fixing portion for attaching the attachment body to the attachment object,
Each of the extending portions includes a distal end side that is a distal end in the extending direction from the base end portion, and two opposing sides that are located between the distal end side and the proximal end portion and face each other. Has a rectangular shape,
In each of the extensions, the tip side has a tip side welded portion that is a welded portion with the outer peripheral surface of the case,
In each of the extension portions, each of said opposing sides have a counter edge welds are welds between the outer peripheral surface of the case,
A plurality of the attachment bodies are provided on the outer peripheral surface of the case,
The plurality of attachment bodies are at least one in each of a first region and a second region set across an axis virtual plane that is a virtual plane that passes through the case axis and extends in the direction of gravity on the outer peripheral surface of the case. One by one,
Furthermore, the mounting body is constituted by a first mounting body and a second mounting body,
The first mounting body has a mounting width in the direction of the case axis and extends outward from the outer peripheral surface of the case, and an outer peripheral surface of the case at the first protruding portion. A first extension portion extended in a rectangular shape from the end portion positioned to one side in the circumferential direction,
The second mounting body has a mounting width in the direction of the case axis and extends outward from the outer peripheral surface of the case; and the outer surface of the case at the second protruding portion. A second extension portion extending in a rectangular shape from the end portion positioned in the circumferential direction opposite to the one side, and
The overhanging portion of the mounting body is in a state where the first overhanging portion and the second overhanging portion are abutted with each other in the circumferential direction,
The extension part of the attachment body is formed of the first extension part and the second extension part,
Exhaust purification device mounting structure.

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