JP5937390B2 - Turbo sensor mounting structure - Google Patents

Description

  The present invention relates to a turbo sensor mounting structure that detects the rotational speed of a turbocharger that includes a turbine, a compressor, a connecting shaft that connects both of them, and a housing.

  In order to detect the rotational speed of a turbocharger having a connecting shaft and a housing connecting the turbine and the compressor, it is proposed to install a turbo sensor so as to detect the rotational speed of the connecting shaft (for example, , See Patent Document 1).

  However, in this case, the turbo sensor outputs one pulse per one rotation of the connecting shaft. Therefore, when the rotation speed of the supercharger is in the low rotation range, the rotation of the supercharger is accurately performed. There was a problem that the number could not be detected.

  In consideration of this point, it has been proposed to attach a turbo sensor so as to detect the rotational speed of the blades of the compressor or turbine (see, for example, Patent Document 2).

  In the turbo sensor mounting structure described in Patent Document 2, the turbo sensor is mounted on a housing surrounding the outer side in the radial direction of the compressor, and counts the number of blades in the blades of the compressor passing over the turbo sensor. It is configured as follows. Therefore, the turbo sensor outputs a plurality of pulses per rotation of the connecting shaft connecting the turbine and the compressor.

  Such a configuration is useful in that the rotational speed of the supercharger can be accurately detected even when the rotational speed of the supercharger is in a low rotational speed range, but the plurality of blades in the blade body of the compressor Therefore, there is a problem that the turbo sensor needs to be arranged so as to face the surface of the air, and therefore, the turbo sensor is easily affected by high-temperature fluid (compressed air).

JP 2006-153122 A JP 2007-332793 A

  The present invention has been made in view of such conventional technology, and is a turbo sensor mounting structure for detecting the rotational speed of a turbocharger having a connecting shaft and a housing for connecting a turbine, a compressor, and both, It is an object of the present invention to provide a turbo sensor mounting structure capable of detecting the rotation speed of the supercharger with high accuracy even in a rotation range and preventing the influence of a high-temperature fluid on the turbo sensor as much as possible.

In order to achieve the above object, the present invention provides a turbo sensor mounting structure for detecting the rotational speed of a turbocharger having a connecting shaft and a housing for connecting the turbine and the compressor, and the turbine and the compressor. Each includes a blade body including a boss portion that is supported relatively non-rotatably on the coupling shaft, and a plurality of blades provided on the boss portion so as to be disposed along a circumferential direction, and the turbo sensor Has a sensor case extending in the axial direction, and a detection coil housed in the sensor case so as to be positioned in the vicinity of the front end surface of the sensor case. Or an installation hole that faces a rotation locus region of the plurality of blades in the blade body of any one of the compressors and has an outer end opening opened outwardly, and the sensor An installation hole having a diameter larger than the outer diameter of the case is formed, and the turbo sensor has a front end surface of the sensor case that is flush with the inner end opening or more than the inner end opening. The sensor case is inserted into the installation hole in a state of being located inside, and the sensor case extends from the insertion part so as to be located outside the housing and an insertion part to be inserted into the installation hole. An outer portion, and the distal end of the outer portion is expanded from the proximal end of the insertion portion so that the distal end surface of the outer portion faces the outer surface of the housing, and the sensor case A heat insulating material is provided to cover at least a portion where the detection coil is located with respect to the axial direction position of the outer surface of the outer surface of the outer surface of the outer surface of the housing, and a sealing material is interposed between the distal end surface of the outer portion and the outer surface of the housing. cage, regarding the radial direction relative to the axis of the outer portion It has an extension part extended along the direction of an axis of the outer part outside from the outer part, and a pressing part supported by the extension part, and the extension part has an axis of the outer part A clamp member having an insertion hole extending along the direction, and a screw member screwed into the housing in a state of being inserted through the insertion hole and fixing the extension portion to the housing. cage, the pressing portion is in contact with one or more locations on the proximal end face of the front Kigai side portion such that the center of the pressing force of the sensor casing by the pressing portion is positioned on the center line in the axial line direction of the sensor casing to provide a mounting structure for Tei Ru turbo sensor.

In order to achieve the above object, the present invention provides a turbo sensor mounting structure for detecting the rotational speed of a supercharger having a connecting shaft and a housing for connecting the turbine and the compressor, and the turbine and the compressor. Each of the compressors includes a blade body including a boss portion that is supported relatively non-rotatably on the connecting shaft, and a plurality of blades provided on the boss portion so as to be disposed along a circumferential direction, The turbo sensor has a sensor case extending in the axial direction, and a detection coil housed in the sensor case so as to be positioned in the vicinity of the front end surface of the sensor case, and the housing has an inner end opening. An installation hole that faces the rotation trajectory region of the plurality of blades in the blade body of either the turbine or the compressor and has an outer end opening opened outwardly, An installation hole having a diameter larger than the outer diameter of the sensor case is formed, and the turbo sensor has a front end surface flush with the inner end opening or inside the installation hole than the inner end opening. The sensor case is inserted into the installation hole in a state where the sensor case is inserted into the installation hole, and an outer portion extending from the insertion portion so as to be located outside the housing. And the distal end of the outer portion is expanded from the base end of the insertion portion so that the distal end surface of the outer portion faces the outer surface of the housing. A heat insulating material that covers at least a portion of the outer side surface where the detection coil is located with respect to the axial position, and when the axial length of the installation hole is L, the axial length is L / 2 or less. Insulation is provided, the front end surface of the outer part and the front Sealing material is interposed between the outer surface of the housing, extends along the axial direction of the outer portion at the outer side than the outer portion relates radially relative to the axis of the outer portion A clamp member having an extension part and a pressing part supported by the extension part, wherein the extension part is formed with an insertion hole extending along the axial direction of the outer part; and the insertion hole A screw member that is screwed into the housing in a state of being inserted into the housing and fixes the extending portion to the housing, and the pressing portion is a center of the pressing force of the sensor case by the pressing portion There is provided a mounting structure of a contact Tei Ru turbo sensor in one or more locations on the proximal end face of the front Kigai side portion to be positioned on the center line in the axial line direction of the sensor case.

In the turbo sensor mounting structure according to the present invention, an installation hole is formed in the turbocharger housing such that an inner end opening faces a rotation locus region of a plurality of blades in a blade body of a turbine or a compressor. Is inserted into the installation hole in a state where the front end surface is flush with the inner end opening or inside the installation hole with respect to the inner end opening, and at least the axial position of the outer surface of the sensor case A heat insulating material is provided to cover a portion where the detection coil of the turbo sensor is located.
Therefore, the rotational speed of the supercharger can be detected with high accuracy even in a low rotation range, and the turbo sensor can be prevented from being affected by the high-temperature fluid as much as possible.

Further, in the turbo sensor mounting structure according to the present invention, an insertion portion into which the sensor case is inserted into the installation hole, and an outer portion extending from the insertion portion so as to be located outside the housing. And the distal end of the outer portion is expanded in diameter from the proximal end of the insertion portion so that the distal end surface of the outer portion faces the outer surface of the housing, and the distal end surface of the outer portion Since a sealing material is inserted between the outer surface of the housing and the outer surface of the housing, the heat insulating material and the sealing material are used as a first sealing material and a second sealing material, respectively, between the sensor case and the housing. A double seal structure can be provided, and leakage of fluid (compressed air) in the housing to the outside can be more effectively prevented.

Further, in the turbo sensor mounting structure according to the present invention, a clamp member fixed to the housing by a screw member screwed to the housing is provided, and the clamp member is a base end surface of the outer portion. A pressing portion that contacts at one or a plurality of locations, and an extending portion that extends radially outward from the outer portion and is fixed to the housing via the screw member. By screwing a member into the housing, the pressing portion presses the sensor case so that the front end surface of the outer portion is pressed against the outer surface of the housing, and the pressing force of the sensor case by the pressing portion The pressing portion is in contact with the base end surface of the outer portion so that the center of the screw member is positioned on the center line in the axial direction of the sensor case, and the screw member is plastic. Because it is screwed to the housing by screwing in frequency, while maintaining the sealing property good, it can be firmly fixed to the sensor casing in the housing.

It is a schematic block diagram by the side of the compressor of the supercharger to which the attachment structure of the turbo sensor which concerns on Embodiment 1 of this invention was applied. 1 is a partial cross-sectional schematic view of a turbo sensor mounting structure according to Embodiment 1. FIG. (A) And (b) is the perspective view and sectional drawing of the heat insulating material in Embodiment 1, respectively. (A) is the partial cross section schematic of the modification of the turbo sensor attachment structure which concerns on Embodiment 1. FIG. (B) is a partial cross-sectional schematic diagram of another modified example of the turbo sensor mounting structure according to Embodiment 1. (A) is a top view of the fixing structure of the sensor case of the turbo sensor in Embodiment 1. FIG. (B) is a side view of the sensor case fixing structure. (A) is a top view of the modification of the fixing structure of the said sensor case. (B) is a side view of a modification of the sensor case fixing structure. (A) And (b) is the perspective view and sectional drawing of the heat insulating material in the attachment structure of the turbo sensor which concerns on Embodiment 2 of this invention, respectively. (A) And (b) is the perspective view and sectional drawing of the modification of the heat insulating material in Embodiment 2, respectively. 6 is a partial cross-sectional schematic view of a turbo sensor mounting structure according to Embodiment 2. FIG.

  A preferred embodiment of a turbo sensor mounting structure according to the present invention will be described with reference to the accompanying drawings. In addition, the member which attached | subjected the same code | symbol in each figure shows that it is the same or substantially the same member, The description is abbreviate | omitted suitably.

[Embodiment 1]
FIG. 1 shows a schematic configuration diagram on the compressor 21 side of a turbocharger 20 to which the turbo sensor 10 mounting structure according to the first embodiment is applied.
As shown in FIG. 1, the supercharger 20 includes a turbine, the compressor 21, a connecting shaft 23 that connects the turbine and the compressor 21, and a housing 24.

  The turbine is inserted into an exhaust line fluidly connected to an engine (not shown), and is configured to be driven by exhaust gas guided from the engine through the exhaust line.

  The compressor 21 is inserted into an intake line 40 fluidly connected to the engine in a state of being connected to the turbine via the connecting shaft 23, and is driven by the turbine to pump air to the engine. It is configured.

  Each of the turbine and the compressor 21 includes a blade body 25. The blade body 25 includes a boss portion 25a supported on the connecting shaft 23 so as not to rotate relative to the connecting shaft 23, and a plurality of blades 25b, 25c provided on the boss portion 25a so as to be disposed along the circumferential direction. And have.

The housing 24 is provided so as to surround the turbine, the compressor 21 and the connecting shaft 23 from the outer peripheral side, and rotatably supports them.
Specifically, the housing 24 includes a turbine housing that surrounds the turbine, a compressor housing 240 that surrounds the compressor 21, and a center housing that surrounds the connecting shaft 23 and connects the turbine housing and the compressor housing 240. Yes.

  As shown in FIG. 1, in the present embodiment, the turbo sensor 10 is arranged not to detect the connecting shaft 23 but to detect a plurality of blades 25b, 25c,. The mounting structure of the turbo sensor 10 according to the present embodiment is applied to the compressor 21 side of the supercharger 20, and the turbo sensor 10 has a plurality of blades 25 b, 25 c, and so on in the blade body 25 of the compressor 21. .. arranged to detect

  According to such a configuration, the number of the plurality of blades 25 b, 25 c... Passing over the turbo sensor 10 can be counted, and a plurality of pulses can be output per one rotation of the connecting shaft 23. Therefore, the rotational speed of the supercharger 20 can be detected with high accuracy even in the low speed rotation range.

  The turbo sensor 10 mounting structure is applied to the compressor 21 side of the supercharger 20 in the present embodiment, but is not limited to this. It is also possible to apply to.

FIG. 2 shows a partial cross-sectional schematic diagram of the mounting structure of the turbo sensor 10 according to the present embodiment.
As shown in FIG. 2, the compressor housing 240 is provided with an installation hole 241 for installing the turbo sensor 10. The installation hole 241 is opened such that the inner end opening 241a faces the rotation locus region 250 of the plurality of blades 25b, 25c... In the blade body 25 of the compressor 21, and the outer end opening 241b is the compressor housing 240. Is open to the outside.

As shown in FIG. 2, the turbo sensor 10 includes a sensor case 100 extending in the axial direction.
Specifically, the sensor case 100 has an insertion portion 110 that has an outer diameter smaller than the diameter of the installation hole 241 and can be inserted into the installation hole 241. Preferably, the outer surface of the sensor case 100 (and the signal line of the turbo sensor 10) is covered with a water resistant resin.

The insertion portion 110 has an outer surface 111 extending in the axial direction and extending in the circumferential direction, and a tip surface 112 that closes one end (tip) of the outer surface 111 in the axial direction.
In the present embodiment, the sensor case 100 has an outer portion 120 in addition to the insertion portion 110. This outer part 120 will be described later.

  As shown in FIG. 2, a detection coil 15 of the turbo sensor 10 is accommodated in the insertion part 110. The detection coil 15 is disposed so as to be positioned in the vicinity of the distal end surface 112 of the insertion portion 110 (a portion near the blade body 25).

In the present embodiment, the turbo sensor 10 is attached to the compressor housing 240 by being inserted in the installation hole 241 along the axial direction.
Specifically, the turbo sensor 10 is disposed in the installation hole 241 in a state where the distal end surface 112 of the insertion portion 110 in the sensor case 100 is positioned inside the installation hole 241 with respect to the inner end opening 241a of the installation hole 241. Has been inserted.

  In addition, the front end surface 112 of the insertion part 110 is located within the installation hole 241 within a range in which a plurality of blades 25b, 25c,... Of the blade body 25 of the compressor 21 can be detected with respect to the axial direction of the installation hole 241. It is located inside the installation hole 241 by a predetermined length from the end opening 241a.

  The position of the tip surface 112 of the insertion portion 110 with respect to the inner end opening 241a of the installation hole 241 is a position where the turbo sensor 10 can detect the plurality of blades 25b, 25c... If it is a position which does not interfere with 25b * 25c ..., it will not specifically limit. For example, the distal end surface 112 of the insertion part 110 may be positioned flush with the inner end opening 241a.

  By the way, in such a turbo sensor mounting structure, the detection coil of the turbo sensor is disposed relatively close to the blades of the compressor (or turbine) in the sensor case. The detection coil is easily affected by heat from air (or exhaust gas). Accordingly, a change in temperature of the turbo sensor occurs, which may cause a change in sensor output (temperature drift).

  In this regard, in the turbo sensor 10 mounting structure according to the present embodiment, at least a portion of the outer surface 111 of the insertion portion 110 of the sensor case 100 where the detection coil 15 is located with respect to the axial position is covered. A heat insulating material 50 is provided. That is, the heat insulating material 50 is provided so as to surround the detection coil 15 from the outer peripheral side via the outer surface 111 of the insertion part 110.

  According to such a configuration, the heat insulating material 50 is interposed between the sensor case 100 and the compressor housing 240, more specifically, between the outer surface 111 of the insertion portion 110 and the inner peripheral surface of the installation hole 241. Since it is arranged in the inserted state, the transfer of heat from the high temperature fluid (compressed air) to the detection coil 15 can be suppressed, and the influence of the temperature of the turbo sensor 10 can be prevented as much as possible. As a result, sensor output change (temperature drift) caused by temperature change of the turbo sensor 10 can be prevented as much as possible.

  Further, in the present embodiment, the heat insulating material 50 is configured such that the outer surface 111 of the insertion portion 110 is sealed so as to seal a gap between the outer surface 111 of the insertion portion 110 and the inner peripheral surface of the installation hole 241. And the inner peripheral surface of the installation hole 241. Thereby, the fluid in the compressor housing 240 can be effectively prevented from leaking outward through the gap.

  Here, the configuration of the heat insulating material 50 will be described in detail.

3A and 3B are a perspective view and a sectional view of the heat insulating material 50 in the present embodiment, respectively.
In the present embodiment, the heat insulating material 50 has a peripheral wall portion 51 that covers the outer surface 111 of the insertion portion 110 of the sensor case 100 as shown in FIGS. 2, 3 (a) and 3 (b). And it is formed in the cylinder shape which the both ends of an axial direction open. The heat insulating material 50 is configured to be fitted onto the insertion part 110 without a gap.

  As long as the heat insulating material 50 covers the detection coil 15, the length in the axial direction is not limited, but preferably the length of the installation hole 241 in the axial direction is L for cost reduction. The length of the heat insulating material 50 in the axial direction is L / 2 or less. More preferably, in order to suppress the transfer of heat from a high-temperature fluid to the detection coil 15 as much as possible, the heat insulating material 50 has the insertion portion 110 inserted into the installation hole 241. The insertion hole 110 is externally fitted to the insertion portion 110 so as to be positioned in a region L / 2 from the inner end opening 241a with respect to the axial direction of the installation hole 241.

  In the present embodiment, as shown in FIG. 2, the length of the heat insulating material 50 in the axial direction is L / 2. The heat insulating material 50 is inserted into the installation hole 241 from the inner end opening 241a of the installation hole 241 with the front end surface 52 positioned flush with the inner end opening 241a of the installation hole 241. 110 is arranged so as to extend along the outer surface 111 of 110.

In this case, the distal end surface 112 of the insertion portion 110 can be positioned inside the installation hole 241 rather than the distal end surface 52 of the heat insulating material 50.
In addition, the front end surface 112 of the insertion part 110 can be positioned flush with the front end surface 52 of the heat insulating material 50 and the inner end opening 241a of the installation hole 241 as shown in FIG. .

Alternatively, the length of the heat insulating material 50 in the axial direction can be shorter than L / 2.
In this case, for example, as shown in FIG. 4B, the distal end surface 112 of the insertion portion 110 is positioned flush with the distal end surface 52 of the heat insulating material 50 than the inner end opening 241 a. It is located inside the installation hole 241.

  According to such a configuration, since the length of the heat insulating material 50 in the axial direction is set to L / 2 or less, the cost can be reduced when the heat insulating material 50 is provided.

  Here, the outer portion 120 of the sensor case 100 will be described in detail.

  As shown in FIG. 2, the outer portion 120 extends from the insertion portion 110 so that the insertion portion 110 is positioned outside the compressor housing 240 when the insertion portion 110 is inserted into the installation hole 241. ing. In the present embodiment, the outer portion 120 extends along the axial direction of the insertion portion 110.

  The outer portion 120 has an outer surface 121 that extends in the axial direction and extends in the circumferential direction, and the distal end 120a side (the insertion portion 110 side) of the outer surface 121 is formed in an enlarged diameter shape or a flange shape. Yes. A distal end surface 122 is provided on the side of the distal end 120a formed in the diameter-expanded shape or the flange shape, and a proximal end surface 123 is disposed on the proximal end side of the outer surface 121 (the side opposite to the insertion portion 110 in the axial direction). Is provided.

  Specifically, the distal end surface 122 of the outer portion 120 is expanded from the proximal end of the insertion portion 110 so that the distal end surface 122 of the outer portion 120 faces the outer surface 242 of the compressor housing 240. . That is, the distal end 120 a of the outer portion 120 has a larger diameter than the diameter of the installation hole 241.

  As a result, when the insertion part 110 of the sensor case 100 is inserted into the installation hole 241 from the outside of the compressor housing 240, the front end surface 122 of the outer part 120 becomes the outer surface 242 of the compressor housing 240. The sensor case 100 can be positioned with respect to the compressor housing 240.

  As shown in FIG. 2, in the present embodiment, a sealing material 60 is interposed between the front end surface 122 of the outer portion 120 and the outer surface 242 of the compressor housing 240. The sealing material 60 is configured to seal a gap between the distal end surface 122 of the outer portion 120 and the outer surface 242 of the compressor housing 240. The sealing material 60 is made of metal such as iron in the present embodiment.

  According to such a configuration, a double seal structure can be provided between the sensor case 100 and the compressor housing 240 using the heat insulating material 50 and the sealing material 60 as the first sealing material and the second sealing material, respectively. . Therefore, leakage of fluid (compressed air) in the compressor housing 240 to the outside can be more effectively prevented.

  Here, the fixing structure of the sensor case 100 will be described.

FIGS. 5A and 5B are a plan view and a side view of a fixing structure of the sensor case 100, respectively.
As shown in FIGS. 5A and 5B, in the present embodiment, the sensor case 100 is fixed to the compressor housing 240 using a clamp member 70 and a screw member 80.

The clamp member 70 is fixed to the compressor housing 240 by the screw member 80 screwed to the compressor housing 240.
Specifically, the clamp member 70 includes a pressing portion 71 that contacts the base end surface 123 of the outer portion 120 at one or a plurality of locations (one location in the present embodiment), and the outer portion from the pressing portion 71. And an extending portion 72 extending outward in the radial direction from 120.

The extending portion 72 is configured to be fixed to the compressor housing 240 via the screw member 80.
In the present embodiment, the extending portion 72 can be placed on the outer surface 242 of the compressor housing 240, and the screw member 80 can be inserted into the extending portion 72 and the outward portion can be inserted. An insertion hole 72 a extending along the axial direction of the portion 120 is formed. The compressor housing 240 is formed with a screw hole 243 that can be screwed into the screw member 80 and can be continuous with the insertion hole 72 a of the extension 72.

  Accordingly, the screw member 80 is inserted into the insertion hole 72a in a state where the extending portion 72 is placed on the outer surface 242 of the compressor housing 240, and is screwed into the screw hole 243 of the compressor housing 240. Accordingly, the screw member 80 can be screwed to the compressor housing 240. Therefore, the extension 72 can be fixed to the compressor housing 240 via the screw member 80.

  In the present embodiment, when the screw member 80 is screwed to the compressor housing 240, the front end surface 122 of the outer portion 120 is connected to the outer surface 242 of the compressor housing 240 via the seal material 60. The pressing portion 71 is configured to be able to press the outer portion 120 so as to be pressed.

  Specifically, when the extension portion 72 is fixed to the compressor housing 240 via the screw member 80 in a state where the pressing portion 71 is in contact with the base end surface 123 of the outer portion 120, the screw As the member 80 is screwed, the pressing portion 71 together with the extending portion 72 is pressed toward the outer surface 242 side of the compressor housing 240 to press the outer portion 120.

  When the pressing portion 71 presses the outer portion 120, the center of the pressing force of the sensor case 100 by the pressing portion 71 is positioned on the center line O1 in the axial direction of the sensor case 100. The pressing portion 71 comes into contact with the proximal end surface 123 of the outer portion 120. Note that the base end surface 123 of the outer portion 120 refers to a surface of the surface of the outer portion 120 that faces away from the insertion portion 110 in the axial direction.

Here, various configurations are included in the configuration in which the center of the pressing force of the sensor case 100 by the pressing portion 71 is positioned on the center line O1.
For example, the form which the said press part 71 presses the base end surface 123 of the said outward part 120 in one place like this Embodiment is contained. In this embodiment, as shown in FIGS. 5A and 5B, the pressing portion 71 has a single contact portion 71 a that contacts the base end surface 123 of the outer portion 120. The contact portion 71a contacts the proximal end surface 123 of the outer portion 120 on the center line O1.

As another example, a form in which the pressing portion 71 presses the base end surface 123 of the outer portion 120 at a plurality of locations is also included.
FIGS. 6A and 6B are a plan view and a side view, respectively, showing a modification of the sensor case 100 fixing structure.

  In such a form, as shown in FIGS. 6A and 6B, the pressing portion 171 has a plurality of contact portions 171 a and 171 a that contact the base end surface 123 of the outer portion 120. The circumferential angles defined by the adjacent contact portions 171a and 171a among the contact portions 171a and 171a are equal (θ1 = θ2), and the center line O1 and each contact portion 171a. The plurality of contact portions 171a and 171a and the base end surface 123 of the outer portion 120 are in contact with each other such that the lengths in the radial direction with respect to 171a are equal (L1 = L2).

  In the present embodiment, as shown in FIGS. 5A and 5B, a recess 125 is formed in a portion of the base end surface 123 of the outer portion 120 located on the center line O1, and this A contact portion 71 a of the pressing portion 71 is fitted in the recess 125.

  In the present embodiment, the screw member 80 is screwed to the compressor housing 240 by screw fastening in a plastic region. Accordingly, the sensor case 100 can be strongly tightened by the screw member 80.

  According to such a configuration, the sensor case 100 can be strongly tightened by the screw member 80 so that the axis of the sensor case 100 does not tilt with respect to the axis of the installation hole 241. Therefore, the sensor case 100 can be firmly fixed to the compressor housing 240 while maintaining good sealing performance.

[Embodiment 2]
Hereinafter, a mounting structure of a turbo sensor 10 according to another embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the member which attached | subjected the same code | symbol in each figure shows that it is the same or substantially the same member, The description is abbreviate | omitted suitably.

  In the turbo sensor mounting structure according to the present embodiment, the heat insulating material 50 is changed to a heat insulating material 150 as compared with the first embodiment. The heat insulating material 150 is different from the heat insulating material 50 in the first embodiment in that the heat insulating material 150 covers the distal end surface 112 of the insertion part 110 of the sensor case 100.

7A and 7B are a perspective view and a sectional view of the heat insulating material 150 in the present embodiment, respectively.
Specifically, as shown in FIGS. 7A and 7B, the heat insulating material 150 includes a peripheral wall portion 151 that covers an outer surface 111 of the insertion portion 110 in the sensor case 100, and the insertion portion 110. And an end wall portion 152 that covers the front end surface 112 of the main body.

  In the present embodiment, the heat insulating material 150 is opened at one end in the axial direction and completely at the other end by the end wall portion 152 that covers the entire peripheral wall portion 151 and the front end surface 112 of the insertion portion 110. It is formed in the cylinder shape (cap shape) obstruct | occluded by.

  In the heat insulating material 150, the peripheral wall portion 151 covers at least a portion of the outer surface 111 of the insertion portion 110 where the detection coil 15 is located with respect to the axial position, and the end wall portion 152 is the insertion portion 110. It is configured so as to be fitted on the insertion part 110 without a gap so as to cover the entire tip surface 112.

  The end wall portion 152 covering the distal end surface 112 of the insertion portion 110 means that the end wall portion 152 extends radially inward from the distal end of the peripheral wall portion 151. As described above, the end wall portion 152 covers not only the entire distal end surface 112 of the insertion portion 110 but also only a portion of the distal end surface 112 of the insertion portion 110.

  That is, the heat insulating material in the present embodiment is replaced with the heat insulating material 150, for example, as shown in FIGS. 8A and 8B, the peripheral wall portion 161 and the tip surface 112 of the insertion portion 110. The cap-shaped heat insulating material 160 having the opening 163 on the inner side in the circumferential direction can be formed by the end wall portion 162 covering the portion.

FIG. 9 is a partial cross-sectional schematic diagram of the mounting structure of the turbo sensor 10 according to the present embodiment.
As shown in FIG. 9, in the present embodiment, in the turbo sensor 10, the end wall portion 152 of the heat insulating material 150 is flush with the inner end opening 241a of the installation hole 241 (or from the inner end opening 241a). Is also inserted into the installation hole 241 so as to be located in the installation hole 241.

  Preferably, as in the present embodiment, the axial length from the end wall portion 152 to the proximal end of the peripheral wall portion 151 in the heat insulating material 150 is set to L / 2 or less. More preferably, the heat insulating material 150 is positioned in a region L / 2 from the inner end opening 241a in the axial direction of the installation hole 241 in a state where the insertion portion 110 is inserted into the installation hole 241. The inner insertion part 110 is externally fitted.

According to such a configuration, when the heat insulating material 150 is attached to the insertion portion 110 of the sensor case 100, the end wall portion 152 is brought into contact with the distal end surface 112 of the insertion portion 110 so that the heat insulation is performed. The material 150 can be easily positioned with respect to the sensor case 100. Further, when the sensor case 100 equipped with the heat insulating material 150 is inserted into the installation hole 241 from the outside of the compressor housing 240, the contact is made between the heat insulating material 150 and the inner peripheral surface of the installation hole 241. It is also possible to prevent displacement of the heat insulating material 150.
Furthermore, since the end wall part 152 of the said heat insulating material 150 covers at least one part of the front end surface 112 of the said insertion part 110, heat insulation can be improved.

DESCRIPTION OF SYMBOLS 10 Turbo sensor 15 Detection coil 20 Supercharger 21 Compressor 23 Connection shaft 24 Housing 25 Blade body 25a Boss part 25b Blade 25c Blade 50 Heat insulation material 60 Seal material 70 Clamp member 71 Press part 72 Extension part 80 Screw member 100 Sensor case 110 Inner portion 111 Outer side surface 112 Front end surface 120 Outer portion 122 Front end surface 123 Base end surface 150 Heat insulating material 151 Peripheral wall portion 152 End wall portion 240 Compressor housing 241 Installation hole 242 Outer surface 241a Inner end opening 241b Outer end opening

Claims (2)

A turbo sensor mounting structure for detecting the rotational speed of a turbocharger having a connecting shaft and a housing for connecting the turbine and the compressor,
Each of the turbine and the compressor includes a blade body including a boss portion that is supported relatively non-rotatably on the connection shaft, and a plurality of blades provided on the boss portion so as to be disposed along a circumferential direction. Prepared,
The turbo sensor has a sensor case extending in the axial direction, and a detection coil housed in the sensor case so as to be positioned in the vicinity of the front end surface of the sensor case,
The housing is an installation hole in which an inner end opening faces a rotation locus region of the plurality of blades in the blade body of either the turbine or the compressor, and an outer end opening is opened outwardly, An installation hole that is larger than the outer diameter of the sensor case is formed,
The turbo sensor is inserted into the installation hole in a state where the front end surface of the sensor case is flush with the inner end opening or is located inside the installation hole than the inner end opening,
The sensor case has an insertion portion that is inserted into the installation hole, and an outer portion that extends from the insertion portion so as to be located outside the housing,
The distal end of the outer part is expanded from the base end of the insertion part so that the distal end surface of the outer part faces the outer surface of the housing,
A heat insulating material is provided to cover at least a portion where the detection coil is located with respect to the axial position of the outer surface of the sensor case,
A sealing material is interposed between the distal end surface of the outer portion and the outer surface of the housing,
An extending portion extending along the axial direction of the outer portion, and a pressing portion supported by the extending portion, outward from the outer portion with respect to the radial direction with respect to the axis of the outer portion. The extending portion is formed with an insertion hole extending along the axial direction of the outer portion, and the extension portion is screwed into the housing while being inserted into the insertion hole. And a screw member for fixing to the housing ,
The pressing portion is Ru abuts Tei in one or more locations on the proximal end face of the front Kigai side portion such that the center of the pressing force of the sensor casing by the pressing portion is positioned on the center line in the axial line direction of the sensor casing A turbo sensor mounting structure characterized by that. A turbo sensor mounting structure for detecting the rotational speed of a turbocharger having a connecting shaft and a housing for connecting the turbine and the compressor,
Each of the turbine and the compressor includes a blade body including a boss portion that is supported relatively non-rotatably on the connection shaft, and a plurality of blades provided on the boss portion so as to be disposed along a circumferential direction. Prepared,
The turbo sensor has a sensor case extending in the axial direction, and a detection coil housed in the sensor case so as to be positioned in the vicinity of the front end surface of the sensor case,
The housing is an installation hole in which an inner end opening faces a rotation locus region of the plurality of blades in the blade body of either the turbine or the compressor, and an outer end opening is opened outwardly, An installation hole that is larger than the outer diameter of the sensor case is formed,
The turbo sensor is inserted into the installation hole in a state where the front end surface of the sensor case is flush with the inner end opening or is located inside the installation hole than the inner end opening,
The sensor case has an insertion portion that is inserted into the installation hole, and an outer portion that extends from the insertion portion so as to be located outside the housing,
The distal end of the outer part is expanded from the base end of the insertion part so that the distal end surface of the outer part faces the outer surface of the housing,
A heat insulating material that covers at least a portion of the outer surface of the sensor case where the detection coil is located with respect to an axial position, and when the axial length of the installation hole is L, the axial length is L / 2 or less heat insulating material is provided,
A sealing material is interposed between the distal end surface of the outer portion and the outer surface of the housing,
An extending portion extending along the axial direction of the outer portion, and a pressing portion supported by the extending portion, outward from the outer portion with respect to the radial direction with respect to the axis of the outer portion. The extending portion is formed with an insertion hole extending along the axial direction of the outer portion, and the extension portion is screwed into the housing while being inserted into the insertion hole. And a screw member for fixing to the housing ,
The pressing portion is Ru abuts Tei in one or more locations on the proximal end face of the front Kigai side portion such that the center of the pressing force of the sensor casing by the pressing portion is positioned on the center line in the axial line direction of the sensor casing A turbo sensor mounting structure characterized by that.

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