Heat shield fastening means

Abstract

An apparatus for shielding hot regions, in particular of an internal combustion engine, includes a heat shield with a through hole. The apparatus has a component, in particular a heat source, with a fastening region which has a receptacle and a shoulder which surrounds the receptacle at least partially. The shoulder extends through the through hole of the heat shield. The apparatus has a fastening element, in particular a screw, which fastens the heat shield to the fastening region, the fastening element being supported on the shoulder, extending through the through hole of the heat shield, and being fastened in the receptacle.

Claims

1. An apparatus for shielding hot regions of an internal combustion engine, having: a heat shield with a through hole; a component with a fastening region which has a receptacle and a shoulder which surrounds the receptacle at least partially, the shoulder extending through the through hole of the heat shield; and a fastening element which fastens the heat shield to the fastening region, the fastening element being supported on the shoulder, extending through the through hole of the heat shield, and being fastened in the receptacle, wherein the shoulder extends in a manner which emanates from a bearing face of the fastening region, and the heat shield abuts against the bearing face of the fastening region.

2. The apparatus according to claim 1, wherein, the heat shield is fastened to the fastening region by means of the fastening element and the shoulder such that the heat shield can slide in a heat expansion direction (W) of the heat shield perpendicularly with respect to a longitudinal axis of the fastening element.

3. The apparatus according to claim 1, wherein a plastic deformation of the heat shield at least is reduced or at least is capable of being reduced in the case of expansion and contraction of the heat shield under the action of heat on the heat shield.

4. The apparatus according to claim 1, wherein, the shoulder projects beyond an outer face of the heat shield, which outer face faces away from the component.

5. The apparatus according to claim 1, wherein, a height of the shoulder is greater than a length of the through hole, and/or a material thickness of the heat shield is smaller than a height of the shoulder.

6. The apparatus according to claim 1, wherein, the shoulder is of annular and/or collar-shaped configuration, and/or the shoulder is spaced apart from an inner circumferential face of the through hole, and/or the fastening element is supported on an annular end face of the shoulder, which annular end face surrounds an inlet opening of the receptacle.

7. The apparatus according to claim 1, wherein, the bearing face of the fastening region is annular.

8. The apparatus according to claim 1, wherein, the fastening element is supported directly on the shoulder, a gap (S) being formed between an outer face of the heat shield, which outer face faces away from the component, and the fastening element.

9. The apparatus according to claim 8, wherein the gap (S) is smaller than 1 mm.

10. The apparatus according to claim 8, wherein the gap (S) is between 0.1 mm and 0.8 mm.

11. The apparatus according to claim 8, wherein the gap (S) is between 0.2 mm and 0.5 mm.

12. The apparatus according to claim 1, wherein, the fastening element is supported on the shoulder indirectly via an intermediate element, a gap (S) being formed between an outer face of the heat shield, which outer face faces away from the component, and the intermediate element.

13. The apparatus according to claim 12, wherein the gap (S) is smaller than 1 mm.

14. The apparatus according to claim 12, wherein the gap (S) is between 0.1 mm and 0.8 mm.

15. The apparatus according to claim 12, wherein the gap (S) is between 0.2 mm and 0.5 mm.

16. The apparatus according to claim 1, wherein, the heat shield is in one layer or in multiple layers, and/or the heat shield is of plate-shaped configuration and/or is adapted to an outer con-tour of the component.

17. The apparatus according to claim 1, wherein, the shoulder is milled into the fastening region, and/or the fastening region is configured as a screw boss, and/or the receptacle is a screw hole, and/or the shoulder and the fastening region are manufactured integrally from one piece.

18. The apparatus according to claim 1, wherein, the component is an exhaust gas routing element comprising an exhaust gas pipe, an exhaust gas manifold, an exhaust gas turbocharger or an exhaust gas after-treatment system, of the internal combustion engine.

19. The apparatus according to claim 1, wherein, the heat shield is fastened rigidly to the component at least one point which is spaced apart from the through hole, and/or the heat shield is fastened to the component such that the heat shield can slide at least one point which is spaced apart from the through hole.

20. A motor vehicle having an apparatus for shielding hot regions of an internal combustion engine, having: a heat shield with a through hole; a component with a fastening region which has a receptacle and a shoulder which surrounds the receptacle at least partially, the shoulder extending through the through hole of the heat shield; and a fastening element which fastens the heat shield to the fastening region, the fastening element being supported on the shoulder, extending through the through hole of the heat shield, and being fastened in the receptacle, wherein the shoulder extends in a manner which emanates from a, bearing face of the fastening region, and the heat shield abuts against the bearing face of the fastening region.

Description

(1) The above-described preferred embodiments and features of the invention can be combined with one another in any desired manner. Further details and advantages of the invention will be described in the following text with reference to the appended drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

(2) FIG. 1 shows a perspective view of a heat shield,

(3) FIG. 2 shows a sectional view through the heat shield from FIG. 1,

(4) FIG. 3 shows a detailed sectional view of a first screw connection of the heat shield, and

(5) FIG. 4 shows a detailed view of a second screw connection of the heat shield.

DETAILED DESCRIPTION

(6) The embodiments which are shown in the figures correspond at least partially, with the result that similar or identical parts are provided with the same reference numerals and, in order to explain them, reference is also made to the description of the other embodiments and/or figures, in order to avoid repetitions.

(7) FIGS. 1 and 2 show a heat shield 10. The heat shield 10 is attached on component 12 (see FIG. 2). The component 12 is a heat source which is to be shielded by the heat shield 10. The component 12 can be, for example, an exhaust gas routing element, for example an exhaust gas pipe, an exhaust gas manifold, a turbocharger or an exhaust gas aftertreatment system, of an internal combustion engine. The internal combustion engine can be included in a motor vehicle, in particular a commercial vehicle, for example a lorry or an omnibus.

(8) The heat shield 10 can be configured in one layer or in multiple layers. The heat shield 10 is preferably produced from a metal.

(9) In particular, the heat shield 10 is attached on a housing of the component 12 via a first screw connection 14 and a second screw connection 16. It is also possible, for example, that the heat shield 10 is attached on the component 12 via further screw connections and/or other fastenings.

(10) Under the action of the heat of the component 12, the heat shield 10 can expand during operation. When the component 12 finally no longer emits heat to the heat shield 10, for example because the internal combustion engine is switched off, the heat shield 10 contracts again. Here, on account of a rigid fastening of the heat shield to the component, plastic deformations of the heat shield can customarily occur. Here, the heat shield can be damaged.

(11) In order to prevent the plastic deformation, the heat shield 10 is fastened to a fastening region 18 of the component 12 such that it can slide via the first screw connection 14. Via the second screw connection 16, the heat shield 10 is fastened rigidly to a second fastening region 20 of the component 12.

(12) It is also possible that the heat shield 10 is fastened to the component 12 such that it can slide via more than one screw connection, and/or that all screw connections between the heat shield 10 and the component 12 fasten the heat shield 10 to the component 12 such that it can slide.

(13) The first screw connection 14 has a fastening element 22 and an intermediate element 24. The second screw connection 16 has a fastening element 26 and an intermediate element 28. The fastening elements 22, 26 are configured by way of example as screws. The fastening elements 22, 26 can also be configured, for example, as bolts, pins with cross bolts or rivets. The intermediate elements 24, 28 are configured by way of example as washers. It is also possible, for example, that no intermediate elements are provided.

(14) In the following text, the first screw connection 14 is described in greater detail with reference to FIG. 3.

(15) The first fastening region 18 has a receptacle 30 and a shoulder (collar) 32. The first fastening region 18 is configured as a screw boss. The receptacle 30 is configured by way of example as a screw hole, in particular a blind hole, with an internal thread.

(16) The shoulder 32 extends from an annular bearing face 34 of the first fastening region 18 through the first through hole 36 of the heat shield 10. The shoulder 32 extends through the first through hole 36 and projects beyond an outer face 44 of the heat shield 10, which outer face 44 faces away from the component 12. The shoulder 32 is higher than a material thickness (thickness) of the heat shield 10.

(17) The shoulder 32 is of annular configuration and surrounds the receptacle 30. In particular, the shoulder 32 has an annular end face 38 which surrounds an inlet opening of the receptacle 30. The shoulder 32 has a circumferential face 40 which is spaced apart from an inner circumferential face of the first through hole 36. The circumferential face 40 is delimited on one side by the bearing face 34 and on the other side by the end face 38. An external diameter of the shoulder 32 is smaller than an internal diameter of the first through hole 36. The shoulder 32 is therefore spaced apart via an annular gap from the inner circumferential face of the first through hole 36.

(18) The heat shield 10 lies on the bearing face 34 of the first fastening region 18. In particular, the heat shield 10 lies on the bearing face 34 by way of a first outer face 42 which faces the component 12.

(19) The intermediate element 24 lies on the end face 38 of the shoulder 32. The intermediate element 24 does not lie on the second outer face 44 of the heat shield 10. In detail, there is a (small) gap S between the second outer face 44 and the intermediate element 24.

(20) The fastening element 22 extends through the intermediate element 24 and the first through hole 36. The fastening element 22 is screwed into the receptacle 30. The fastening element 22 is supported via the intermediate element 24 on the end face 38 of the shoulder 32. The fastening element 22 clamps the intermediate element 24 in between itself and the shoulder 32. In particular, the intermediate element 24 is clamped in between a screw head of the fastening element 22 and the end face 38 of the shoulder 32.

(21) On account of the gap S, the heat shield 10 is capable of sliding with regard to the first fastening region 18 and the fastening element 22. In other words, the heat shield 10 is not fastened rigidly to the first fastening region 18. As a result, in the case of thermal expansion, the heat shield 10 can move with regard to the first fastening region 18 within the limits of the annular gap which exists between the shoulder 32 and the inner circumferential face of the first through hole 36.

(22) In particular, the heat shield 10 is fastened to the first fastening region 18 such that it can slide in a main thermal expansion direction of the heat shield 10, that is to say in a direction perpendicularly with respect to a longitudinal axis of the fastening element 26. Therefore, the heat shield 10 can slide under the intermediate element 28 in the case of expansion or contraction.

(23) In order to ensure slidable fastening of the heat shield 10, the gap S can be, for example, greater than 0.1 mm and smaller than 0.8 mm. Depending on the possible manufacturing and assembly tolerance, the gap S can also be dimensioned, for example, in the range of hundredths of millimetres.

(24) It is also possible, for example, that no intermediate element is provided, and a fastening element is supported directly on the shoulder 32. In the case of a fastening element of this type, a diameter of the screw head would be greater than a diameter of the first through opening 36 of the heat shield 10. In other words, the fastening element and the intermediate element can also be produced as an integrated unit from one piece.

(25) FIG. 4 shows the rigid screw connection 16 in greater detail.

(26) The second fastening region 20 has a receptacle 46 and an annular bearing face 48. The receptacle 46 is configured as a screw hole, for example blind hole, with an internal thread. The annular bearing face 48 surrounds an inlet opening of the receptacle 46.

(27) That outer face 42 of the heat shield 10 which faces the component 12 lies on the bearing face 48. The intermediate element 28 lies on that outer face 44 of the heat shield 10 which faces away from the component 12. The fastening element 26, in particular a screw head of the fastening element 26, is supported via the intermediate element 28 on the outer face 44. The fastening element 26 of the second screw connection 16 extends through the intermediate element 28 and a second through hole 50 of the heat shield 10, and is screwed into the receptacle 46. The heat shield 10 is clamped in rigidly between the intermediate element 28 and the bearing face 48.

(28) With reference to FIGS. 1 and 2, the heat shield 10 can expand in a direction W (see FIG. 1) under the action of heat on account of the slidable screw connection 14 and the rigid screw connection 16. Here, the heat shield 10 can slide along the screw connection 14. Plastic deformation/damage of the heat shield 10 is prevented. In the case of the subsequent contraction of the heat shield 10 in an opposite direction to the direction W in the case of a reduction or removal of the action of heat, the heat shield 10 can again slide along the screw connection 14. Plastic deformation/damage of the heat shield 10 can also be prevented here.

(29) The invention is not restricted to the above-described preferred exemplary embodiments. Rather, a multiplicity of variants and modifications are possible which likewise utilize the concept of the invention and therefore fall within the scope of protection. In particular, the invention also claims protection for the subject matter and the features of the subclaims independently of the claims, to which reference is made. In particular, the features of independent claim 1 are disclosed independently of one another. In addition, the features of the subclaims are also disclosed independently of all features of independent claim 1 and, for example, independently of the features with regard to the presence and/or the configuration of the heat shield, the component and the fastening element of independent claim 1.

LIST OF REFERENCE NUMERALS

(30) 10 Heat shield 12 Component 14 First screw connection 16 Second screw connection 18 First fastening region 20 Second fastening region 22 Fastening element 24 Intermediate element 26 Fastening element 26 Intermediate element 28 Receptacle 30 Shoulder (collar) 32 Bearing face 36 First through hole 38 End face 40 Circumferential face 42 First outer face 44 Second outer face 46 Receptacle 48 Bearing face 50 Second through hole S Gap W Heat expansion direction