RU2775761C2 - Device for shielding high-temperature zones and vehicle containing specified device - Google Patents

Abstract

FIELD: engine building.

SUBSTANCE: invention can be used in devices for shielding high-temperature zones, in particular, of internal combustion engines. The device for shielding high-temperature zones, in particular, of an internal combustion engine, includes heat shield (10), part (12), and fastening element (22). Heat shield (10) is made with through hole (36). Part (12), in particular, a heat source with fastening area (18) contains socket (30) and protrusion (32), which at least partially covers socket (30) and continues through the through hole (36) in heat shield (10). Fastening element (22), in particular, a screw fixes heat shield (10), which rests on protrusion (32), on fastening area (18). Fastening element (22) continues through the through hole (36) in heat shield (10), and it is fixed in socket (30). Protrusion (32) continues from, in particular, annular support surface (34) of first fastening area (18). Heat shield (10) can be adjacent to support surface (34) of first fastening area (18). Fastening element (22) can rest directly on protrusion (32). In this case, gap (S) is formed between outer surface (44) of heat shield (10) remote from part (12) and fastening element (22), which is less than 1 mm, in particular, is in the range from 0.1 to 0.8 mm, preferably from 0.2 to 0.5 mm. Fastening element (22) can rest on protrusion (32) indirectly, through intermediate element (24), in particular, a pad washer. In this case, gap (S) is formed between outer surface (44) of heat shield (10) remote from part (12) and intermediate element (24), which is less than 1 mm, in particular, is in the range from 0.1 to 0.8 mm, preferably from 0.2 to 0.5 mm. Heat shield (10) can be made single-layer or multi-layer. Heat shield (10) can be made in the form of a plate and/or adapted to the outer contour of part (12). Protrusion (32) can be milled in first fastening area (18). First fastening area (18) can be made in the form of threaded tide. Socket (30) can be a screw hole. Protrusion (32) and fastening area (18) can be made as a single whole. A vehicle is disclosed.

EFFECT: simplification of a design, and prevention of a damage to a heat shield.

9 cl, 4 dwg

Description

The invention relates to a screening device for high-temperature zones, in particular, an internal combustion engine.

Heat shields can be used to shield high-temperature zones, for example, in internal combustion engines of vehicles, in particular in the area of the exhaust tract. Heat shields are designed to protect parts and assemblies sensitive to temperature effects. However, heat shields can also improve noise protection.

Typically, heat shields are three-dimensional structural pieces containing at least one layer of sheet metal. In this case, the three-dimensional shape of at least one sheet metal layer is usually determined by the shape of the parts fitted to each other and the distance between them.

The attachment of the heat shield to the workpiece is usually done with a point connection. To this end, the sheet metal layer or, respectively, all sheet metal layers can comprise at least one through hole in which the fastening element is placed. In this case, for example, screws, bolts, pins with horizontal bolts or rivets are used as fastening elements.

Heat can also be transferred to the heat shield at these fixing points if mounted on a hot part. When exposed to heat, the heat shield can expand and then contract again when heat transfer to the heat shield stops. This can lead to plastic deformation and damage to the heat shield.

A heat shield is known from DE 11 2014 003 457 T5. This heat shield includes a through hole for passing the fastener and a sleeve penetrating through the through hole. Additionally, the heat shield includes a disconnecting element made of flexible material located between the edge of the circumference of the through hole and the bushing.

Other fixing systems for heat shields are known, for example, from US 7,065,963 B2 and JP 2012-36828 A.

The present invention is based on the object of providing a heat shield device having an improved point of attachment of the heat shield to the workpiece. In particular, such a connection must be simple in design and prevent or at least reduce damage to the heat shield due to thermal expansion.

The task is achieved by creating a device according to the independent claim. Preferred additional embodiments of the invention are listed in the dependent claims and in the description.

The device is intended for shielding high-temperature zones, in particular, an internal combustion engine. This device includes a heat shield with a through hole. The device includes a part, in particular, a heat source with a fastening area containing a socket and a protrusion that at least partially encloses the socket. The protrusion extends through a through hole in the heat shield. The device includes a fastening element, in particular a screw (or bolt, pin with horizontal bolt or rivet). The fixing element secures the heat shield to the fixing area. The fastening element rests on the protrusion, continues through the through hole of the heat shield and is fixed in the socket.

The device enables the sliding or slidable fastening of the heat shield to the workpiece and has a simple structure. The protrusion makes it possible not to clamp the heat shield between the fastening area and the fastening element without the necessary additional parts. Thus, during expansion or contraction, the heat shield can slide relative to the workpiece and the fastener over the fastening area. This makes it possible to compensate for different thermal expansions between the workpiece and the heat shield. This helps to prevent plastic deformation and damage to the heat shield.

With the help of the protrusion, the sliding fastening can be implemented at low cost. By eliminating the need for additional parts for the implementation of the sliding fastening, the costs and laboriousness of installation can be reduced.

In the most preferred embodiment of the invention, the heat shield is secured in the fastening area by means of a fastening element and a slidable protrusion in the direction of the thermal expansion of the shield, in particular in a direction vertical with respect to the longitudinal axis of the fastening element.

In particular, the heat shield can be slidable or capable of being slidable by thermal expansion under the head of the fastening element in the form of a screw.

In a further embodiment of the invention, the plastic deformation of the heat shield as the heat shield expands and contracts when the heat shield is exposed to heat is at least reduced, or at least it is possible to reduce it.

In one exemplary embodiment of the invention, the protrusion extends through the outer surface of the heat shield remote from the part. This makes it possible to maintain a gap between the heat shield and the fastening element or, respectively, the intermediate element located between the fastening element and the heat shield. Due to this gap, the heat shield can slide relative to the attachment area when the shield expands and contracts as a result of thermal action.

In an additional embodiment of the invention, the height of the protrusion is greater than the length of the first through hole and/or the thickness of the heat shield material is less than the height of the protrusion.

In one of the embodiments of the invention, the protrusion is made in the form of a ring and/or shoulder and/or spaced from the inner surface of the circumference of the through hole. Alternatively or additionally, the fastening element rests on an annular end surface of a protrusion enclosing the socket inlet.

In a further embodiment of the invention, the protrusion extends from the in particular annular bearing surface of the first fastening area. The heat shield is adjacent to the bearing surface of the first fastening area.

In one of the embodiments of the invention, the fastener rests directly on the protrusion, while a gap is formed between the outer surface of the heat shield distant from the part and the fastener. This gap allows the heat shield to be slidably attached to the mounting area.

In an additional embodiment of the invention, the fastening element rests on the protrusion indirectly, through an intermediate element, in particular, a washer, while a gap is formed between the outer surface of the heat shield distant from the part and the intermediate element.

In a further embodiment of the invention, the gap is less than 1 mm, in particular in the range of 0.1 to 0.8 mm, preferably 0.2 to 0.5 mm. A gap of this size is already sufficient to provide for a sliding fastening preventing plastic deformation of the heat shield.

In one of the embodiments of the invention, the heat shield is single-layer or multi-layer. With single-layer heat shields, the area of the shield surrounding the through hole may be formed (set) at an angle, such as by stamping, to prevent knocking when vibrations occur. With multilayer heat shields, several layers, in particular metal layers, can be connected to each other by several indentation points. The metal layers may have different thicknesses to provide different natural frequencies of the individual layers.

In a further embodiment of the invention, the heat shield is made in the form of a plate and/or adapted to the outer contour of the part. In particular, the heat shield may at least partially enclose the workpiece.

In one of the embodiments of the invention, the protrusion is milled in the first fastening area. This allows the protrusion to be produced by simple technological operations.

Alternatively or additionally, the first fastening area may be in the form of a threaded boss, the socket may be a screw hole, such as a blind hole with internal threads, and/or the protrusion and the fastening area may be made in one piece.

In a further embodiment of the invention, the part is an element of a gas vent, in particular an exhaust pipe, an exhaust manifold, a gas turbine supercharger or an exhaust aftertreatment system of an internal combustion engine.

In one of the embodiments of the invention, the heat shield is fixedly (in particular, without the possibility of sliding) fixed to the part at least in one place, spaced from the through hole. In particular, the fixed attachment point may be located on the side of the heat shield opposite the through hole. Thus, the heat shield can expand under thermal influence from this fixed attachment in the direction of the sliding attachment. The fixed attachment can be implemented as the fixed screw connection described here.

Alternatively or additionally, the heat shield is slidably attached to the part at least in one location away from the through hole. In particular, the heat shield is slidably connected to the workpiece at locations where plastic deformation/damage of the shield would occur if fixed. The sliding fastening can be made as the fastening area described here with a ledge.

The invention also relates to a vehicle, in particular to a utility vehicle with a device as described herein.

The device described here can also be used in other high temperature shielding devices.

The preferred embodiments and features of the invention described above can be combined with each other in any combination. Other details and advantages of this invention are described below with reference to the accompanying drawings. They show:

Fig. 1 - A perspective view of the heat shield;

Fig. 2 is a sectional view of the heat shield shown in FIG. one;

Fig. 3 - Enlarged section of the first threaded connection of the heat shield; and

Fig. 4 - Detailed view of the second threaded connection of the heat shield.

The embodiments of the invention depicted in the figures coincide at least partially, since similar or identical parts are designated by the same reference numbers and, as explanations, reference is made to the description of other embodiments or, accordingly, to other figures in order to avoid repetition.

In FIG. 1 and 2 shows a heat shield 10. The heat shield 10 is placed on the part 12 (see Fig. 2). Item 12 is a source of heat that needs to be shielded by heat shield 10. Item 12 can be a venting element such as an exhaust pipe, exhaust manifold, turbocharger or aftertreatment system of an internal combustion engine. The internal combustion engine may be used in a vehicle, in particular a utility vehicle such as a truck or bus.

The heat shield 10 may have one or more layers. Preferably, the heat shield 10 is made of metal.

In particular, the heat shield 10 is placed on the body of the part 12 by means of the first threaded connection 14 and the second threaded connection 16. It is also possible, for example, that the heat shield 10 is placed on the part 12 using additional threaded connections and/or other fasteners.

Under the influence of heat from the part 12, the heat shield 10 may expand during operation. If the part 12 stops supplying thermal energy to the heat shield 10, for example due to the shutdown of the internal combustion engine, the heat shield 10 shrinks again. Usually, due to the fixed attachment of the heat shield to the workpiece, plastic deformations of the shield can occur. Doing so may damage the heat shield.

To prevent plastic deformation, the heat shield 10 is attached to the part 12 in the fastening area 18 with the help of the first threaded connection 14 with the possibility of sliding. With the help of the second threaded connection 16, the heat shield 10 is fixedly fixed to the part 12 in the second fastening area 20.

It is also possible for the heat shield 10 to be slidably attached to the piece by more than one threaded connection and/or for all threaded connections between the shield 10 and the piece 12 to slidably attach the heat shield 10 to the piece 12.

The first screw connection 14 comprises a fastening element 22 and an intermediate element 24. The second screw connection 16 comprises a fastening element 26 and an intermediate element 28. The fastening elements 22, 26 are made, for example, in the form of screws. The fasteners 22, 26 may also be in the form of bolts, pins with horizontal bolts or rivets, for example. The intermediate elements 24, 28 are made, for example, in the form of washers. It is also possible that no intermediate elements are provided at all.

The following is a detailed description of the first threaded connection 14 with reference to FIG. 3.

The first fastening area 18 contains a socket 30 and a ledge (shoulder) 32. The first fastening area 18 is made in the form of a threaded boss. The socket 30 is made, for example, in the form of a hole for a screw, in particular a blind hole with an internal thread.

The protrusion 32 extends from the annular support surface 30 of the first fastening area 18 through the first through hole 36 in the heat shield 10. The protrusion 32 continues through the first through hole 36 and protrudes above the outer surface 44 of the heat shield 10 remote from the part 12. The height of the protrusion 32 is greater than the thickness of the heat shield screen 10.

The protrusion 32 is made in the form of a ring and surrounds the socket 30. In particular, the protrusion includes an annular end surface 38, covering the inlet of the socket 30. The protrusion 32 includes a side surface 40 spaced from the inner surface of the circumference of the first through hole 36. The side surface 40 is limited, with on the one hand, the bearing surface 34 and, on the other hand, the end surface 38. The outer diameter of the protrusion 32 is smaller than the inner diameter of the first through hole 36. Thus, the protrusion 32 is spaced from the inner surface of the circumference of the first through hole 36 to form an annular gap.

The heat shield 10 bears against the bearing surface 34 of the first fastening region 18. In particular, the heat shield 10 bears against the first outer surface 42 facing the workpiece 12 against the bearing surface 34.

The intermediate element 24 bears against the end surface 38 of the protrusion 32. The intermediate element 24 does not bear against the second outer surface 44 of the heat shield 10. In particular, there is a (small) gap S between the second outer surface 44 and the intermediate member 24.

The fastener 22 continues through the intermediate element 24 and the first through hole 36. The fastener 22 is screwed into the socket 30. The fastener 22 rests on the end surface 38 of the protrusion 32 through the intermediate element 24. The fastener 22 clamps the intermediate element 24 between itself and the protrusion 32. In particular, the intermediate element 24 is clamped between the head of the fastener 22 and the end surface 38 of the protrusion 32.

Due to the gap S, the heat shield 10 can slide relative to the first fastening region 18 and the fastening member 22. In other words, the heat shield 10 is movably fixed in the first fastening region 18. Due to this, the heat shield 10 can move relative to the first fastening region 18 during thermal expansion within the annular gap existing between the protrusion 32 and the inner surface of the circumference of the first through hole 36.

In particular, the heat shield 10 is slidably fixed in the first fastening region 18 in the direction of the main thermal expansion of the shield 10, i.e. in a direction vertical with respect to the longitudinal axis of the fastening element 26. Thus, during expansion or contraction, the heat shield 10 can slide under the intermediate element 28.

In order to ensure sliding fastening of the heat shield 10, the gap S can be, for example, greater than 0.1 mm and less than 0.8 mm. Depending on the possible technological and installation tolerance, the size of the gap S can be, for example, in the range of hundredths of a millimeter.

It is also possible, for example, not to provide an intermediate element and the fastening element will rest directly on the protrusion 32. In such a fastening element, the diameter of the screw head would be larger than the diameter of the first through hole 36 of the heat shield 10. In other words, the fastening element and the intermediate element can also be made in one piece.

In FIG. 4 shows a detailed view of the fixed threaded connection 16.

The second fastening area 20 comprises a socket 46 and an annular support surface 48. The socket 46 is in the form of a screw hole, for example a blind hole with an internal thread. An annular support surface 48 surrounds the inlet of the socket 46.

Facing the part 12, the outer surface 42 of the heat shield 10 is adjacent to the support surface 48. The intermediate element 28 is adjacent to the outer surface 44 of the heat shield 10, which is remote from the part 12. The fastener 26, in particular, the head of the fastener 26, rests on the outer surface 44 through the intermediate element 28. The fastening element 26 of the second threaded connection 16 extends through the intermediate element 28 and the second through hole 50 of the heat shield 10 and is screwed into the socket 46. The heat shield 10 is clamped between the intermediate element 28 and the support surface 48 without the possibility of movement.

According to FIG. 1 and 2, it can be seen that the heat shield 10 can expand in the direction W under the influence of heat (see Fig. 1) thanks to the sliding threaded connection 14 and the fixed connection 16. In this case, the heat shield 10 can slide along the threaded connection 14. This prevents plastic deformation / damage to the heat shield 10. When the heat shield 10 is subsequently compressed in the direction opposite to the W direction, as a result of a decrease or termination of the thermal effect, the shield 10 can again slide along the threaded connection 14. In this case, plastic deformation / damage to the heat shield 10 can also be prevented.

The present invention is not limited to the preferred embodiments that have been described above. Moreover, many variations and modifications are possible, which will also use the idea of this invention, and therefore such variations will be included in the scope of legal protection. In particular, the present invention claims to protect the subject matter and features of the dependent claims, regardless of reference to the respective claims. In particular, the features of the independent claim 1 of the claims can be disclosed independently of each other. Additionally, the features of the dependent claims are disclosed independently of all the features of the independent claim 1 and, for example, regardless of the features regarding the presence and/or configuration of the heat shield, part and fastener from the independent claim 1.

Position number list

10 - Heat shield

12 - Detail

14 - First threaded connection

16 - Second threaded connection

18 - First fastening area

20 - Second mounting area

22 - Fastener

24 - Intermediate element

26 - Fastener

28 - Intermediate element

30 - Nest

32 - Ledge (shoulder)

34 - Supporting surface

36 - First through hole

38 - End face

40 - Side surface

42 - First outer surface

44 - Second outer surface

46 - Nest

48 - Supporting surface

50 - Second through hole

S - Gap

W - Direction of thermal expansion

Claims (27)

1. Screening device for high-temperature zones, in particular, an internal combustion engine, including heat shield (10) with a through hole (36); part (12), in particular, a heat source with a fastening area (18) containing a nest (30) and a protrusion (32), which at least partially covers the nest (30) and continues through a through hole (36) in the heat shield ( ten); and fastening element (22), in particular, a screw fixing the heat shield (10) on the fastening area (18), which rests on the protrusion (32), continues through the through hole (36) in the heat shield (10) and is fixed in the socket ( 30), characterized in that the protrusion (32) extends from, in particular, the annular support surface (34) of the first fastening area (18); and the heat shield (10) is adjacent to the support surface (34) of the first fastening area (18); or the fastener (22) rests directly on the protrusion (32), while between the outer surface (44) of the heat shield (10) remote from the part (12) and the fastener (22) a gap (S) is formed, which is less than 1 mm, in particular, is in the range from 0.1 to 0.8 mm, preferably from 0.2 to 0.5 mm; or the fastening element (22) rests on the protrusion (32) indirectly, through the intermediate element (24), in particular, the washer, while between the outer surface (44) of the heat shield (10) remote from the part (12) and the intermediate element (24 ) a gap (S) is formed which is less than 1 mm, in particular in the range of 0.1 to 0.8 mm, preferably 0.2 to 0.5 mm; or the heat shield (10) is single-layer or multi-layer; and/or the heat shield (10) is made in the form of a plate and/or adapted to the outer contour of the part (12); or the protrusion (32) is milled in the first fastening area (18); and/or the first fastening area (18) is made in the form of a threaded lug; and/or socket (30) is a screw hole; and/or the protrusion (32) and the mounting area (18) are made in one piece. 2. The device according to claim 1, characterized in that the heat shield (10) is fixed by the fastening element (22) and the protrusion (32) on the fastening area (18) with the possibility of sliding in the direction (W) of the thermal expansion of the heat shield (10), in particular, in the vertical direction relative to the longitudinal axis of the fastening element (22 ) direction. 3. Device according to claim 1 or 2, characterized in that plastic deformation of the heat shield (10) during expansion and contraction of the heat shield (10) under thermal action on the heat shield (10) at least decreases, or at least there is a possibility of its reduction. 4. Device according to any one of the preceding paragraphs, characterized in that the protrusion (32) continues through the outer surface (44) of the heat shield (10) remote from the part (12). 5. Device according to any one of the preceding paragraphs, characterized in that the height of the protrusion (32) is greater than the length of the first through hole (36); and/or the thickness of the material of the heat shield (10) is less than the height of the ledge (32). 6. The device according to any one of the preceding paragraphs, characterized in that the protrusion (32) is made in the form of a ring and/or shoulder; and/or the protrusion (32) is spaced from the inner surface of the circumference of the through hole (36); and/or the fastening element (22) rests on the annular end surface (38) of the protrusion (32) enclosing the inlet of the socket (30). 7. Device according to any one of the preceding paragraphs, characterized in that part (12) is an element of a gas outlet, in particular, an exhaust pipe, an exhaust manifold, a gas turbine pressurization or an exhaust gas aftertreatment system of an internal combustion engine. 8. Device according to any one of the preceding paragraphs, characterized in that the heat shield (10) is fixedly fixed on the part (12) at least in one place away from the first through hole (36); and/or the heat shield (10) is fixed on the part (12) with the possibility of sliding at least in one place, spaced from the first through hole (36). 9. A vehicle, in particular a utility vehicle, comprising a device according to any one of the preceding paragraphs.

Images