Mounting arrangement

Abstract

Fastening arrangement (2), in particular for fastening a slave cylinder housing, wherein a flange (19) of the slave cylinder housing (3) has a bore (31) in which a bushing (23) is arranged and a screw (32) with a threaded pin (36) projects through the bushing (23), wherein a dirt collar (28) is arranged between a screw head (33) of the screw (32) and the flange (19), characterized in that the flange (19) has at least one extension (26) which rises from a surface (25) of the flange (19) in the direction of a screw axis (27) of the screw (32), and the dirt collar (28) has at least one recess (29) corresponding to the extension (26), and in that the screw head (33) comprises a plate (34) which has an annular groove (35) on the side facing the threaded pin (36), into which the extensions (26) engage.

Description

[0001] The present invention relates to a fastening arrangement, in particular for fastening a slave cylinder housing, wherein a flange of the slave cylinder housing has a bore in which a bushing is arranged and a screw with a threaded pin projects through the bushing, wherein a dirt collar is arranged between a screw head of the screw and the flange.

[0002] DE 10 2005 045 630 A1 discloses an arrangement in which a sleeve and a web are clamped by the screw head of a fastening screw, whereby the web is partially plastically deformed. If the web is designed as a dirt collar, it is subjected to a moment when the fastening screw is tightened due to the friction between the screw head and the dirt collar, thereby deforming it. Further prior art is disclosed in EP 1 382 863 B1, EP 0 228 993 B1, and US Pat. No. 4,872,795 A.

[0003] An object of the invention is to reduce or prevent the deformation of the dirt collar.

[0004] This problem is solved by a fastening arrangement, in particular for fastening a slave cylinder housing, wherein a flange of the slave cylinder housing has a bore in which a bushing is arranged and a screw with a threaded pin projects through the bushing, wherein a dirt collar is arranged between a screw head of the screw and the flange, wherein the flange has at least one extension which rises from a surface of the flange in the direction of a screw axis of the screw and the dirt collar has at least one recess corresponding to the extension. The screw head thus only presses on the extension, not on the dirt collar, so that no torque is exerted on it during screwing.

[0005] In a preferred embodiment, the flange has three extensions, and the dirt collar preferably has three recesses corresponding to the extensions. This ensures that the screw head is evenly loaded when tightening the screw, thus causing little or no bending stress on the screw.

[0006] The dirt collar preferably has at least one web on the side facing the screw head. When the screw is tightened, the web rests against the screw head or a plate of the screw head, so that an axial force is exerted on the dirt collar and this is pressed onto the flange. The surface of the web that is in contact with the screw head or the plate of the screw head is relatively small, so that only a small moment is exerted on the dirt collar. It is preferably provided that the dirt collar has at least one web, more preferably two webs, between two recesses on the side facing the screw head. This means that the dirt collar is pressed evenly onto the flange. The screw head comprises a plate which, on the side facing the threaded pin, has an annular groove into which the extensions and / or webs engage. The extensions orWebs were thus guided through the ring groove when tightening the screw.

[0007] An embodiment of the invention is explained below with reference to the accompanying drawings. In the drawings: Fig. 1 a section through a central release bearing with a fastening arrangement according to the invention; Fig. 2 a top view of one of the flanges; Fig. 3 a cut according to CC in Fig. 2.

[0008] Fig. 1 shows a sectional view through a slave cylinder 1 with a fastening arrangement 2 according to the invention. The slave cylinder 1 comprises a slave cylinder housing 3 with a longitudinal bore 4, in which a guide sleeve 5 is arranged at a radial distance. The guide sleeve 5 comprises a cylindrical part 6, which merges into a disc-shaped base region 8 on a side 7 facing a transmission housing (not shown). The guide sleeve 5 encompasses the slave cylinder housing 3 with a further cylindrical region 9 and a collar 10, thus establishing a positive connection. A seal 11 is arranged between the slave cylinder housing 3 and the base region 8. In the pressure chamber 12 formed by the guide sleeve 5 and the slave cylinder housing 3, an annular piston 13 is arranged so as to be axially displaceable and is provided with an annular seal 14 on the side facing the pressure chamber 12.The annular piston 13 is connected to an inner bearing ring 15 of a release bearing 16, the outer bearing ring 17 of which interacts with a disc spring (not shown) to form a vehicle clutch in the drive train of a motor vehicle between an internal combustion engine and a manual transmission. The release bearing 16 is subjected to a force relative to the slave cylinder housing 3 by means of a preload spring 18. The slave cylinder housing 3 has several flanges 19 with which it is attached to the transmission housing (not shown) or to a clutch bell housing or the like.

[0009] Fig. 2 shows a top view in the direction of arrow 20 in Fig. 1 onto one of the flanges 19. Fig. 3 shows a section according to CC in Fig. 2. The flange 19 has a bore 21, the diameter of which is widened in a region 22 facing the gear housing. A bushing 23 is arranged in the bore 21, the outer contour of which essentially follows the inner contour of the bore 21. The outer contour of the bushing 23 is designed in the region of the transition from the smaller to the larger diameter such that an axial play 24 remains between the bushing 23 and the flange 19. The flange 19 has a flat surface 25 from which axial extensions 26 protrude. The axial direction with respect to the extensions 26 is designated by the screw axis 27, i.e., runs in the direction of the screw axis 27. As can be seen from Fig. 2, the extensions 26 are each a section of a hollow cylinder, thus having an inner radius and an outer radius, wherein the axis of the radii coincides with the screw axis 27. In the present embodiment, the surface 25 of the flange 19 has three extensions 26, which each extend in the circumferential direction over one sixth of the circumference, wherein these are each arranged at an angle of 120° to one another. The fastening arrangement 2 further comprises a dirt collar 28, which is also placed on the surface 25. The dirt collar 28 has, as can be seen from Fig. 2, recesses 29 which correspond to the extensions 26 and have an additional clearance relative to them. In the installed position as shown in Fig. 2, two webs 30 are arranged between the recesses 29, which project beyond the surface of the dirt collar 28.

[0010] A screw 32 is arranged in a bore 31 of the bushing 23, with which the flange 19 and thus the slave cylinder 1 is fastened to a gearbox housing or a clutch bell. The screw 32 has, as can be seen Fig. 3, a screw head 33 with a plate 34 and a threaded pin 36. The plate 34 comprises an annular groove 35 into which both the extensions 26 and the webs 30 engage in the installed position.

[0011] When screw 32 is tightened into a threaded hole in the gearbox housing, it presses with the plate 34 against both the bushing 23 and the extensions 26 and the webs 30. The extensions 26 can be plastically or elastically deformed, so that both the bushing 23 is pressed firmly against the surface of the gearbox housing (not shown), and the flange 19 itself is pressed against this surface. Additionally, the dirt collar 28 is pressed onto the flange 19 via the webs 30, so that it is securely fastened and cannot rattle.

[0012] Since the surface area of the webs 30 that comes into contact with the plate 34 is very small, only a very small torque is exerted on the dirt collar 28 when the screw 32 is tightened, so that the dirt collar 28 does not rotate during screwing. The force flow practically only passes through the bushing 23 and the flange 19 of the slave cylinder housing 3, but not through the dirt collar 28. If the webs 30 are omitted, the dirt collar 28 is no longer fixed in the axial direction, but is nevertheless secured against loss.

[0013] This mounting arrangement was described using the example of a slave cylinder housing. However, the mounting arrangement is also applicable to other applications where two parts need to be connected and a bushing and dirt collar are used for the mounting. List of reference symbols 1 slave cylinder 2 Mounting arrangement 3 slave cylinder housing 4 Longitudinal bore 5 Guide sleeve 6 Cylindrical part 7 Gearbox housing facing side 8 Floor area 9 Cylindrical area 10 collars 11 Seal 12 Pressure chamber 13 ring pistons 14 Ring seal 15 Bearing inner ring 16 release bearings 17 Bearing outer ring 18 Preload spring 19 Flange 20 Arrow 21 Hole 22 Area of the bore 23 socket 24 Axial play 25 Surface 26 extension 27 Screw axis 28 dirt collars 29 Recess 30 jetty 31 bore 32 screw 33 screw head 34 plates 35 ring groove 36 threaded pin

Claims

[1] Fastening arrangement (2), in particular for fastening a slave cylinder housing, wherein a flange (19) of the slave cylinder housing (3) has a bore (31) in which a bushing (23) is arranged and a screw (32) with a threaded pin (36) projects through the bushing (23), wherein a dirt collar (28) is arranged between a screw head (33) of the screw (32) and the flange (19), characterized by that the flange (19) has at least one extension (26) which rises from a surface (25) of the flange (19) in the direction of a screw axis (27) of the screw (32) and the dirt collar (28) has at least one recess (29) corresponding to the extension (26) and that the screw head (33) comprises a plate (34) which has an annular groove (35) on the side facing the threaded pin (36) into which the extensions (26) engage. [2] Fastening arrangement (2) according to claim 1, characterized bythat the flange (19) has three extensions (26) and the dirt collar (28) has three recesses (29) corresponding to the extension (26). [3] Fastening arrangement (2) according to one of claims 1 or 2, characterized by that the dirt collar (28) has at least one web (30) on the side facing the screw head (33). [4] Fastening arrangement (2) according to claim 3, characterized by that the dirt collar (28) has at least one web (30) between two recesses (29) on the side facing the screw head (33). [5] Fastening arrangement (2) according to claim 4, characterized by that the dirt collar (28) has two webs (30) between two recesses (29) on the side facing the screw head (33). [6] Fastening arrangement (2) according to one of claims 1 to 5, characterized bythat the screw head (33) comprises a plate (34) which has an annular groove (35) on the side facing the threaded pin (36) into which the webs (30) engage.

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