JP2016014353A - Turbocharger heat insulation cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbocharger heat insulation cover capable of improving handleability while satisfying a performance requirement related to heat insulation.SOLUTION: A turbine-side heat insulation cover 40 is configured to change a thickness thereof depending on an attachment position, and to set the thickness to a first thickness in a particularly high temperature region while setting the thickness to a second thickness smaller than the first thickness in a lower temperature region than the particularly high temperature region. With this configuration, it is possible to control the thickness of the turbine-side heat insulation cover 40 in a range in which a heat insulation performance for making a surface temperature lower than a predetermined value can be maintained. As a result, it is possible to improve handleability upon satisfying a performance requirement related to heat insulation to make the surface temperature equal to or lower than the predetermined value.

Description

  The present invention relates to a heat insulating cover attached to a supercharger.

  In a supercharger applied to an internal combustion engine, air is sucked by a turbine that rotates a turbine impeller (turbine impeller) by supplying exhaust gas and a compressor impeller (compressor impeller) that is coaxially connected to the turbine impeller. And a compressor impeller for sucking and compressing air and supplying the compressed air to the engine. In such a turbocharger, conventionally, a heat insulating cover is attached so that the surface temperature of the turbine housing or the like becomes a predetermined value or less (see, for example, Patent Document 1).

Japanese Patent No. 4798045

  However, the above conventional heat insulating cover can sufficiently achieve the required performance related to heat insulation, but on the other hand, further improvement has been demanded with respect to the handling property in attaching / detaching from the housing.

  The present invention has been made in view of the above, and an object of the present invention is to provide a heat insulating cover for a supercharger with improved handling properties while satisfying the required performance for heat insulation.

  In order to achieve the above object, a heat insulating cover according to one aspect of the present invention is a heat insulating cover attached to a supercharger, and the heat insulating cover is a turbine side heat insulating cover attached to a surface of a turbine housing in the supercharger. The turbine-side heat insulating cover includes a belt-like cover main body portion formed so as to be disposed along the scroll portion of the turbine housing, and the cover main body portion includes a first region having a first thickness; And a second region having a second thickness that is less than the first thickness.

  According to the above heat insulating cover, the first region having the first thickness and the second region having the second thickness smaller than the first thickness are formed in the cover main body portion of the turbine side heat insulating cover. Provided. Although the surface temperature of the turbine housing is high, the temperature is slightly different depending on the position. Therefore, for example, by configuring the cover main body portion in the low temperature region so as to be the second region thinner than the other regions, it is possible to reduce excessive heat insulation for the low temperature region. be able to. Moreover, the handleability of a heat insulation cover improves by reducing the thickness of a cover main-body part. Therefore, according to said heat insulation cover, handleability improves, satisfy | filling the required performance which concerns on heat insulation.

  Here, the cover main body can be configured such that the second region is provided on the bearing housing side along the axial direction of the rotation shaft in the supercharger.

  In the turbine housing, the temperature on the bearing housing side is lower than that on the opposite side. Therefore, by providing the second region having the second thickness on the bearing housing side, the thickness of the heat insulating cover can be adjusted in accordance with the temperature distribution of the turbine housing, and the handleability can be improved.

  Moreover, the cover main body part can be made into the aspect by which the edge part by the side of a bearing housing is made into the turbine housing side rather than the main-body part of a bearing housing.

  As described above, since the end on the bearing housing side is on the turbine housing side with respect to the main body portion of the bearing housing, the handleability is further improved.

  The compressor-side heat insulating cover further includes a compressor-side heat insulating cover attached to the surface of the compressor housing in the supercharger, and the compressor-side heat insulating cover is formed in a belt-like second cover body formed so as to be disposed along the scroll portion of the compressor housing. And the second cover main body can be configured to include a third region having a third thickness smaller than the second thickness.

  Generally, since the compressor housing is cooler than the turbine housing in the turbocharger, a third region having a third thickness smaller than the second thickness of the second region in the turbine-side heat insulating cover is provided. Even if the compressor side heat insulating cover is included, the heat insulating performance can be satisfied. Moreover, the handleability of the compressor side heat insulating cover is improved by reducing the thickness of the heat insulating cover.

  In addition, the compressor-side heat insulating cover may be provided with a window portion that allows the second cover main body portion to visually recognize the surface of the compressor housing.

  When the compressor-side heat insulation cover has a window portion that allows the surface of the compressor housing to be visually confirmed, for example, by providing a window portion at a position corresponding to the name plate provided on the surface of the compressor housing, the name plate can be removed without removing the compressor-side heat insulation cover. Since it can be referred to, handling properties are further improved.

  Moreover, a heat insulation cover can be made into the aspect fixed with respect to a supercharger with heat-resistant rubber.

  When the heat insulating rubber is fixed to the supercharger with heat-resistant rubber, the heat insulating cover can be easily attached and detached as compared with a conventional structure in which the heat insulating cover is fixed with a band or the like, and the handleability is improved.

  Moreover, the heat insulation cover which concerns on one form of this invention is a heat insulation cover attached to a supercharger, Comprising: A heat insulation cover is 1st area | region which has 1st thickness, and 2nd thinner than 1st thickness. And a second region having a thickness of.

  Here, the first region and the second region may be different from each other in the thickness of the heat insulating material included in the heat insulating cover.

  Moreover, a 1st area | region can be made into the aspect which is an area | region which covers the part which becomes high temperature rather than the part which a 2nd area | region covers among superchargers.

  ADVANTAGE OF THE INVENTION According to this invention, the heat insulation cover of the supercharger which the handleability improved while satisfy | filling the required performance which concerns on heat insulation is provided.

It is a schematic block diagram of the supercharger with which the heat insulation cover which concerns on one Embodiment of this invention was attached. 2A is an exhaust gas outlet side side view of the turbine side heat insulating cover 40, FIG. 2B is a front view, and FIG. 2C is a bearing housing side side view. 3A is a partial cross-sectional view taken along line IIIa-IIIa in FIG. 2A, and FIG. 3B is a partial cross-sectional view taken along line IIIb-IIIb in FIG. FIG. 4A is a partial cross-sectional view taken along line IVa-IVa in FIG. 2A, and FIG. 4B is a partial cross-sectional view taken along line IVb-IVb in FIG. FIG. FIG. 5A is a side view on the bearing housing side of the compressor side heat insulating cover, FIG. 5B is a front view, and FIG. 5C is a side view on the suction port side. FIG. 6A is a diagram for explaining a window portion provided in the compressor-side heat insulating cover, FIG. 6B is a diagram for explaining a normal window portion, and FIG. 6C is a nameplate. It is a figure explaining the window part at the time of reference. It is a figure explaining the modification which fixed the heat insulation cover with the heat resistant rubber.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic configuration diagram of a supercharger to which a heat insulating cover according to an embodiment of the present invention is attached. The supercharger 1 includes a turbine 10 and a compressor 20 (centrifugal compressor). The turbine 10 includes a turbine housing 11 and a turbine impeller 12 housed in the turbine housing 11. A spiral scroll portion 13 through which exhaust gas flows is provided in the turbine housing 11. The compressor 20 includes a compressor housing 21 and a compressor wheel 22 accommodated in the compressor housing 21. A spiral scroll portion 23 through which exhaust gas flows is provided in the compressor housing 21.

  The turbine impeller 12 is provided at one end of a rotating shaft 32 extending along the axis X direction, and the compressor impeller 22 is provided at the other end of the rotating shaft 32. A bearing housing 31 is provided between the turbine housing 11 and the compressor housing 21. The rotating shaft 32 is rotatably supported by the bearing housing 31 via a bearing 33, and the rotating shaft 32, the turbine impeller 12 and the compressor impeller 22 rotate as an integral rotating body.

  The turbine housing 11 is provided with an exhaust gas inlet 15 and an exhaust gas outlet 16. Exhaust gas discharged from an internal combustion engine (not shown) flows into the turbine housing 11 through the exhaust gas inlet 15, rotates the turbine impeller 12 while moving in the scroll portion 13, and then the exhaust gas flow It flows out of the turbine housing 11 through the outlet 16.

  The compressor housing 21 is provided with a suction port 25 and a discharge port (not shown). When the turbine impeller 12 rotates as described above, the compressor impeller 22 rotates through the rotation shaft 32. The external air introduced through the silencer 26 by the rotation of the compressor wheel 22 is sucked through the suction port 25, passes through the scroll portion 23, and is discharged from the discharge port. The compressed air discharged from the discharge port is supplied to the aforementioned internal combustion engine.

  The bearing housing 31 is provided with a lubricating oil passage 34 that constitutes a cooling means and is used for lubricating the bearing 33. The bearing housing 31 is also provided with a lubricating oil supply channel 35 that is connected to the lubricating oil channel 34. By flowing the lubricating oil into the lubricating oil flow path 34, the inside of the bearing housing 31 is maintained at a predetermined temperature. The bearing housing 31 may be provided with a cooling water flow path (not shown) that constitutes a cooling means.

  The heat insulating cover attached to the supercharger 1 includes a turbine side heat insulating cover 40 and a compressor side heat insulating cover 50.

  The turbine-side heat insulating cover 40 is attached to the surface of the turbine housing 11 in the turbine 10. Since the exhaust gas introduced into the turbine 10 has a high temperature, the surface of the turbine housing 11 that forms the exhaust gas flow path also has a high temperature (for example, about 600 to 800 ° C.). Therefore, the surface temperature of the turbine housing 11 is controlled to a predetermined value (for example, about 220 ° C.) or less by attaching the turbine-side heat insulating cover 40 to the surface of the turbine housing 11. The end of the turbine-side heat insulating cover 40 on the exhaust gas outlet 16 side covers the peripheral edge portion of the exhaust gas outlet 16 of the turbine housing 11. An end portion of the turbine side heat insulating cover 40 on the bearing housing 31 side covers a portion where heat from the turbine 10 side is easily transmitted. Specifically, the turbine housing 11 and the bearing housing 31 of the turbocharger 1 are a protruding portion 31b that protrudes outward from an end portion on the turbine 10 side of the main body portion 31a that extends along the axis X direction in the bearing housing 31. In FIG. 3, the bolt 37 is fastened and fixed via a pressing plate 36. The end of the turbine-side heat insulating cover 40 is attached so as to cover at least the bolt 37 and not the main body 31a.

  The compressor-side heat insulating cover 50 is attached to the surface of the compressor housing 21 of the compressor 20. Since the external air introduced into the compressor 20 is cooler than the exhaust gas, the compressor 20 side is generally at a lower temperature (for example, about 200 to 250 ° C.) than the turbine 10 side. However, by attaching the compressor-side heat insulating cover 50 to the surface of the compressor housing 21, the surface temperature of the compressor-side heat insulating cover 50 is controlled so as not to rise above a predetermined value. The end of the compressor-side heat insulating cover 50 on the suction port 25 side is connected to the connection with the silencer 26 connected to the suction port 25. Further, the end portion on the bearing housing 31 side covers a portion where heat from the compressor 20 side is easily transmitted. Specifically, the compressor housing 21 and the bearing housing 31 of the supercharger 1 are a protruding portion 31c that protrudes outward from an end portion of the main body portion 31a extending along the axis X direction of the bearing housing 31 on the compressor 20 side. The bolt 38 is fastened and fixed. The end of the compressor side heat insulating cover 50 is mounted so as to cover at least the bolt 38 and not the main body 31a.

  The turbine side heat insulating cover 40 and the compressor side heat insulating cover 50 are each made of a material having heat insulating properties. Specifically, since the heat insulation performance is required, the turbine side heat insulating cover 40 is formed by covering a heat insulating material such as a half silica mat or a glass mat with a surface material such as a silica cloth or a silicon coated glass mat. It can be set as the heat insulation structure made. Further, the compressor-side heat insulating cover 50 may have a lower heat-insulating performance than the turbine 10 side, and can be constituted by, for example, a silicon-coated glass mat.

  Here, the turbine-side heat insulating cover 40 will be further described with reference to FIGS. 2A is an exhaust gas outlet side side view of the turbine side heat insulating cover 40, FIG. 2B is a front view, and FIG. 2C is a bearing housing side side view. In FIG. 2B, the belt portion is omitted. 3A is a partial cross-sectional view taken along line IIIa-IIIa in FIG. 2A, and FIG. 3B is a cross-sectional view taken along line IIIb-IIIb in FIG. FIG. 4A is a partial cross-sectional view taken along line IVa-IVa in FIG. 2A, and FIG. 4B is a partial cross-sectional view taken along line IVb-IVb in FIG. FIG.

  As shown in FIG. 2, the turbine-side heat insulating cover 40 includes a strip-shaped main body portion 41 (cover main body portion) formed so as to be disposed along the scroll portion 13 of the turbine housing 11, and one of the main body portions 41. A band portion 44 provided at the end portion 42. A plurality of band loops 45 are provided at an end portion 43 opposite to the end portion 42 on the side where the band portion 44 is provided, and on the side surface of the end portion 42 opposite to the side surface where the band portion 44 is provided. A band stopper 46 is provided. The main body portion 41 is attached to the outer surface of the turbine housing 11 by passing the band portion 44 through the plurality of band passages 45 and stopping the band portion 44 with a band stopper metal fitting 46.

  The main body 41 has a substantially C shape when viewed from the side by sewing the exhaust gas outlet side cover portion 41a and the bearing housing side cover portion 41b at the ends thereof, and the cross section thereof is substantially U-shaped. It has a shape.

  Further, the exhaust gas outlet side cover portion 41 a and the bearing housing side cover portion 41 b each include a heat insulating material 60 and a bag-shaped surface layer material 61 that accommodates the heat insulating material 60. As the heat insulating material 60, a half silica mat, a glass mat, or the like is used. Further, the surface layer material 61 is composed of, for example, a surface material 61a composed of a silicon-coated glass mat or the like, and a silica cloth which is disposed mainly on the surface side of the turbine housing 11 and has higher heat resistance than the surface material 61a. The back material 61b to be formed is stitched at the end. Thus, the turbine-side heat insulating cover 40 is formed by stitching the exhaust gas outlet side cover portion 41a and the bearing housing side cover portion 41b constituted by the surface layer material 61 in which the heat insulating material 60 is accommodated at the ends. .

  The band part 44 is stitched to the exhaust gas outlet side cover part 41a on the end part 42 side. Further, the band passage 45 is provided in each of the exhaust gas outlet side cover portion 41a and the bearing housing side cover portion 41b on the end portion 43 side so that the band portion 44 can pass therethrough. Further, a band stopper 46 is provided on the bearing housing side cover portion 41b on the end portion 42 side.

  Here, the turbine-side heat insulating cover 40 includes a first region having a first thickness and a second region having a second thickness smaller than the first thickness, depending on the attachment position. It has a configuration.

  Specifically, the turbine housing 11 is hot because the exhaust gas is hot. Therefore, it is considered that the temperature increases from the exhaust gas inlet 15 through which the exhaust gas flows toward the exhaust gas outlet 16. On the other hand, the bearing housing 31 is kept at a relatively low temperature because it is cooled by lubricating oil or cooling water, so the side closer to the bearing housing 31 is compared to the other exhaust gas outlet 16 side. The temperature is low. Therefore, the turbine-side heat insulating cover 40 has an increased thickness in the region on the exhaust gas outlet 16 side (first region) in the outer peripheral portion of the exhaust gas flow path, so that the heat insulating performance can be improved. ing. Moreover, in the area | region (2nd area | region) by the side of the bearing housing 31 of the turbine side heat insulation cover 40, in the range which can maintain the heat insulation performance that the surface temperature becomes lower than predetermined value after mounting | wearing, the turbine side heat insulation cover 40 of The thickness is reduced.

  In order to realize such a configuration, in the turbine-side heat insulating cover 40, the thickness of the heat insulating material 60 accommodated therein is changed according to the mounting position.

  In the turbine-side heat insulating cover 40, a first heat insulating material 60a and a second heat insulating material 60b having different thicknesses are used as heat insulating materials. Among these, the thickness of the 1st heat insulating material 60a shall be 40 mm, for example, the thickness of the 2nd heat insulating material 60b shall be 20 mm, for example, and the thickness of a heat insulating material can be adjusted for every attachment position by combining these. . Moreover, it is good also as a structure which uses two 2nd heat insulating materials in piles instead of a 1st heat insulating material.

  In the turbine-side heat insulating cover 40 according to the present embodiment, for example, in the vicinity of the end 43 attached in the vicinity of the exhaust gas inlet 15, as shown in FIG. 3, the first heat insulating material 60 a is used in the exhaust gas outlet-side cover 41 a. The cover portion is configured by the second heat insulating material 60b in the bearing housing side cover portion 41b. Similarly, in the region where the turbine housing 11 is mounted along the scroll portion 13, as shown in FIG. 4, in the exhaust gas outlet side cover portion 41a, the cover portion is constituted by the first heat insulating material 60a. On the other hand, in the bearing housing side cover part 41b, the cover part is comprised by the 2nd heat insulating material 60b. As shown in FIG. 4, the end of the substantially C-shaped inner peripheral portion of the turbine-side heat insulating cover 40 disposed around the exhaust gas outlet 16 when attached to the turbine housing 11 (FIG. 2A). Reference) is also arranged so as to be covered with the back material 61b having high heat insulation performance. Thus, the thickness of a heat insulating material can be adjusted according to an attachment position by combining the 1st heat insulating material 60a and the 2nd heat insulating material 60b.

  Next, the compressor-side heat insulating cover 50 will be described with reference to FIGS. 5 and 6. FIG. 5A is a side view on the bearing housing side of the compressor-side heat insulating cover 50, FIG. 5B is a front view, and FIG. 5C is a side view on the suction port side. Moreover, Fig.6 (a) is a figure explaining the window part provided in the compressor side heat insulation cover 50, FIG.6 (b) is a figure explaining the window part at normal time, FIG.6 (c). These are figures explaining the window part at the time of nameplate reference.

  The compressor-side heat insulating cover 50 is formed on a band-shaped main body 51 (second cover main body) formed so as to be disposed along the scroll portion 23 of the compressor housing 21 and one end 52 of the main body 51. A provided band part 54. A plurality of band-throughs 55 are provided at the end 53 opposite to the end 52 on the side where the band portion 54 is provided (the band-through 55 is also provided on the back side (not shown)). A band stopper 56 is provided on the suction port side surface opposite to the bearing housing side surface where the band portion 44 is provided. Further, a single rope portion 57 made of a fastening glass sleeve is bound to the end portion on the suction port side of the band-shaped main body portion 51.

  The main body 51 is attached to the outer surface of the compressor housing 21 by passing the band portion 54 through the plurality of band passages 55 and stopping the band portion 54 with the band stopper 56. Further, by tying the rope portion 57, the end portion on the side surface of the suction port side is also fixed.

  The main body 51 is substantially C-shaped when viewed from the side, and has a substantially U-shaped cross section. Further, unlike the turbine side heat insulating cover 40, no heat insulating material is used, and it is made of a material constituting the surface material 61a of the turbine side heat insulating cover 40 such as a silicon-coated glass mat. That is, the thickness of the main body 51 of the compressor-side heat insulating cover 50 is configured to be smaller than that of the turbine-side heat insulating cover 40. That is, the turbine-side heat insulating cover 40 also includes a third region having a third thickness that is thinner than a region (second region) on the bearing housing 31 side where the thickness is reduced.

  The main body 51 is provided with a window 70 as shown in FIGS. The window portion 70 is formed in the main body portion 51 so that the surface of the compressor housing 21 can be visually recognized, a cover portion 72 having a shape capable of covering the opening portion 71, and the opening portion 71. The support part 73 attached to the main-body part 51 so that a movement is possible is comprised. The cover portion 72 and the support portion 73 are made of the same material as that of the main body portion 51, that is, a silicon-coated glass mat or the like.

  The opening 71 is provided at a position corresponding to the nameplate 27 attached to the surface of the compressor housing 21 of the supercharger 1 when the compressor-side heat insulating cover 50 is attached. The nameplate 27 describes information on the turbocharger 1 such as the type of the turbocharger 1 and the types of the turbine 10 and the compressor 20, and the operator grasps the specifications of the turbocharger covered with the heat insulating cover. This is what we refer to.

  During normal operation such as during operation of the supercharger 1, the window 70 is opened by inserting a cover 72 having a larger area than the opening 71 into the opening 71 as shown in FIG. Heat insulation is maintained by being blocked. On the other hand, when an operator refers to the nameplate 27, the nameplate 27 is referred to by moving the cover portion 72 from the inside of the opening 71 and exposing the opening 71 as shown in FIG. 6C. be able to. In addition, the shape of the window part 70 provided in order to refer to the nameplate 27 is not limited to the above. As a configuration of the window portion 70, for example, instead of the configuration in which the cover portion 72 that closes the opening portion 71 is provided, the opening portion 71 is provided corresponding to the attachment position of the nameplate 27, and the opening portion 71 is covered with a transparent heat insulating member. Thus, it may be configured such that the nameplate 27 can be confirmed at all times.

  As described above, the thickness of the turbine-side heat insulating cover 40 and the compressor-side heat insulating cover 50 attached to the turbocharger 1 according to the present embodiment is changed according to the attachment position, and compared with the compressor-side heat insulating cover 50. By using the turbine-side heat insulating cover 40 having a thick structure, the handleability can be improved while maintaining the heat insulating performance.

  Further, the thickness of the turbine-side heat insulating cover 40 is changed according to the mounting position, and the thickness is set to the first thickness particularly in a region where the temperature is high, while in the region where the temperature is lower than that. By adopting a configuration in which the thickness is a second thickness that is smaller than the first thickness, the thickness of the turbine-side heat insulating cover 40 is set within a range in which the heat insulating performance can be maintained such that the surface temperature is lower than a predetermined value. Can be controlled. The conventional turbine-side heat insulating cover has been selected and manufactured so that the surface temperature is lower than a predetermined value at the highest temperature. Therefore, although the heat insulating performance is sufficiently high, the thickness of the entire heat insulating cover is increased uniformly, and there is room for improvement in handling properties such as desorption. On the other hand, in the turbine-side heat insulating cover 40, the thickness of the heat insulating material in the bearing housing side cover portion 41b attached to the bearing housing 31 side is set to be larger than that of the heat insulating material in the exhaust gas outlet side cover portion 41a that becomes higher temperature. By reducing the thickness, it is possible to improve the handleability while satisfying the required performance related to heat insulation so that the surface temperature becomes a predetermined value or less.

  Further, the conventional turbine-side heat insulating cover and the compressor-side heat insulating cover cover the turbine 10 and the compressor 20 to the extent that the main part of the bearing housing 31 is covered. On the other hand, in the turbine-side heat insulating cover 40 and the compressor-side heat insulating cover 50 according to the present embodiment, portions where heat from the turbine 10 side or the compressor 20 side is easily transmitted, that is, the turbine housing 11 and the bearing housing 31, respectively. The bolt 37 that is the connecting portion of the compressor housing 21 and the bolt 38 that is the connecting portion between the compressor housing 21 and the bearing housing 31 are covered, while the main body 31a of the bearing housing 31 is not covered. As described above, since the portion where heat from the turbine 10 side and the compressor 20 side is easily transmitted is covered with the heat insulating cover, the heat insulating performance can be sufficiently satisfied, while the heat insulating cover can be downsized. The handling of the heat insulating cover is further improved.

  As mentioned above, although the heat insulation cover of the supercharger which concerns on embodiment of this invention was demonstrated, this invention is not necessarily limited to embodiment mentioned above, A various change can be made in the range which does not deviate from the summary. it can.

  For example, in the above-described embodiment, the turbine-side heat insulating cover 40 and the compressor-side heat insulating cover 50 have been described as heat-insulating covers attached to the supercharger 1, but at least the turbine-side heat insulating cover 40 may be provided. For example, when the temperature of the compressor 20 does not become higher than a predetermined value during the operation of the supercharger 1, the compressor side heat insulating cover 50 may not be attached. Furthermore, the attachment position of the heat insulating cover attached to the supercharger 1 is not limited to the outside of the turbine housing 11 or the compressor housing 21 and can be changed as appropriate. Also in this case, the heat insulating cover can be configured to include a first region having a first thickness and a second region having a second thickness smaller than the first thickness. Further, the thickness of the heat insulating cover can be adjusted by the thickness of the heat insulating material. Further, the first region can be configured to be a region that covers a portion of the supercharger 1 that is at a higher temperature than a portion that is covered by the second region of the heat insulating cover.

  Moreover, the shape of the turbine side heat insulation cover 40 and the compressor side heat insulation cover 50 is not limited to the said embodiment. In the said embodiment, it was set as the structure which changes the thickness of the turbine side heat insulation cover 40 for every attachment position by combining the 1st heat insulation material 60a and the 2nd heat insulation material 60b from which thickness differs mutually. The turbine-side heat insulating cover 40 may be manufactured using a heat insulating material that is not uniform and is inclined so that one side is thick and the other side is thin. Moreover, it is not limited to the structure of the said embodiment which provides an area | region where thickness is small in the bearing housing 31, The position which provides an area | region where thickness is small can be changed in the range with which heat insulation performance satisfy | fills required performance.

  Moreover, it is good also as a structure which changes also about the thickness of a surface layer material according to an attachment position. Further, the compressor-side heat insulating cover 50 may have a configuration in which a heat insulating material is accommodated in a bag-like surface layer material, similarly to the turbine-side heat insulating cover 40. Further, the compressor-side heat insulating cover 50 may be configured such that the thickness is changed according to the attachment position.

  In the above embodiment, the configuration in which the turbine side heat insulating cover 40 is mounted and fixed to the turbine housing 11 using the band portion 44 has been described. In addition, although the configuration in which the compressor-side heat insulating cover 50 is mounted and fixed to the compressor housing 21 using the band portion 54 and the rope portion 57 has been described, the configuration can be changed as appropriate.

  Here, as one of the methods that can be more easily fixed to the supercharger 1, a method of fixing the heat insulating cover with heat-resistant rubber will be described with reference to FIG. In the supercharger 1 shown in FIG. 7, a turbine side heat insulating cover 40 a is attached to the turbine housing 11. Further, a compressor side heat insulating cover 50 a is attached to the compressor housing 21.

  The turbine-side heat insulating cover 40 a is obtained by removing the band portion 44, the band through 45, and the band stopper metal 46 from the turbine-side heat insulating cover 40. Such a turbine-side heat insulating cover 40a is not fixed by the band portion 44, but is fixed by using annular heat-resistant rubbers 81a and 81b having heat resistance. As the heat resistant rubbers 81a and 81b, for example, rubber having a heat resistant limit temperature of 200 ° C. or higher such as silicone rubber or fluorine rubber is preferably used. Moreover, when fixing the turbine side heat insulation cover 40a with the heat resistant rubbers 81a and 81b, it is preferable to fix at a plurality of locations using a plurality of heat resistant rubbers. Furthermore, the stability with respect to the turbine housing 11 can be improved by attaching the annular heat-resistant rubbers 81a and 81b along the direction intersecting the axis X (preferably the direction orthogonal) as shown in FIG.

  The compressor side heat insulating cover 50a has the same structure as the turbine side heat insulating cover 40a. That is, the band portion 54, the band loop 55 and the band stopper 56 are removed from the compressor-side heat insulating cover 50. Such a compressor-side heat insulating cover 50a can be fixed using annular heat-resistant rubbers 82a and 82b having heat resistance instead of being fixed by the band portion 54.

  Thus, when it is set as the structure which fixes the turbine side heat insulation cover 40a or the compressor side heat insulation cover 50a with heat resistant rubber, attachment / detachment becomes easier than the case where it fixes using a band part, and the handleability of a heat insulation cover improves. .

  As described above, the shapes of the turbine-side heat insulating cover 40 and the compressor-side heat insulating cover 50 can be appropriately changed including the component configuration for fixing.

DESCRIPTION OF SYMBOLS 1 Supercharger 10 Turbine 11 Turbine housing 12 Turbine impeller 13 Scroll part 15 Exhaust gas inflow port 16 Exhaust gas outflow port 20 Compressor 21 Compressor housing 22 Compressor impeller 23 Scroll part 25 Inlet 26 Muffler 27 Name plate 31 Bearing housing 31a Main body part 31b Protruding part 31c Protruding part 32 Rotating shaft 33 Bearing 34 Lubricating oil flow path 35 Lubricating oil supply flow path 36 Holding plate 37, 38 Bolts 40, 40a Turbine side heat insulating cover 41 Main body part 41a Exhaust gas outlet side cover part 41b Bearing housing side cover part 42, 43 End part 44 Band part 45 Band through 46 Band stopper metal 50, 50a Compressor side heat insulating cover 51 Main body part 52, 53 End part 54 Band part 55 Band through part 56 Band stopper metal part 57 Rope part 60, 60a, 60b Heat insulating material 61 Surface layer material 61a Surface material 61b Back surface material 70 Window part 71 Opening part 72 Cover part 73 Support part 81a, 81b, 82a, 82b Heat resistant rubber X Axis

Claims (9)

A heat insulating cover attached to the turbocharger,
The heat insulating cover includes a turbine side heat insulating cover attached to a surface of a turbine housing in the supercharger,
The turbine-side heat insulating cover includes a strip-shaped cover main body portion formed so as to be disposed along a scroll portion of the turbine housing,
The said cover main-body part is a heat insulation cover of a supercharger containing the 1st area | region which has 1st thickness, and the 2nd area | region which has 2nd thickness thinner than said 1st thickness. The cover body is
2. The heat insulating cover for a supercharger according to claim 1, wherein the second region is provided on a bearing housing side along an axial direction of a rotation shaft in the supercharger. The cover body is
The heat insulating cover for a supercharger according to claim 1 or 2, wherein an end portion on the bearing housing side is closer to the turbine housing side than a main body portion of the bearing housing. A compressor-side heat insulating cover attached to the surface of the compressor housing in the supercharger;
The compressor-side heat insulating cover includes a belt-shaped second cover main body portion formed so as to be disposed along the scroll portion of the compressor housing,
The supercharger according to any one of claims 1 to 3, wherein the second cover main body includes a third region having a third thickness that is thinner than the second thickness. Insulation cover.   The said compressor side heat insulation cover is a heat insulation cover of the supercharger of Claim 4 provided with the window part which can visually recognize the surface of the said compressor housing in a said 2nd cover main-body part.   The said heat insulation cover is a heat insulation cover of the supercharger as described in any one of Claims 1-5 fixed with respect to the said supercharger with heat-resistant rubber. A heat insulating cover attached to the turbocharger,
The heat insulating cover includes a first region having a first thickness and a second region having a second thickness that is smaller than the first thickness.   The heat insulating cover for a supercharger according to claim 7, wherein the first region and the second region are different from each other in thickness of a heat insulating material included in the heat insulating cover. The heat insulation cover for a supercharger according to claim 7, wherein the first region is a region that covers a portion of the supercharger that is hotter than a portion covered by the second region.

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