Spring housing and starting device with such a spring housing

Description

[0001] The invention relates to a spring housing according to the preamble of claim 1 and a starting device with such a spring housing.

[0002] WO 2015 / 072900 A1 discloses a starter device for starting an internal combustion engine, comprising a spring housing mounted for rotation about a rotational axis, in which a spring receiving space of the spring housing is covered with a cover plate. The base body of the spring housing has screw bosses extending in the direction of the rotational axis on the peripheral edge of the spring receiving space. Corresponding holes are arranged in the cover plate, which completely penetrate the cover plate in the direction of the rotational axis. To secure the cover plate, screws are screwed through the holes in the cover plate into the screw bosses. The screw bosses are arranged radially outside the spring receiving space. The spring housing requires a large amount of installation space in the radial direction.

[0003] From WO 2015 / 199658 A1, a spring housing is known with a spring accommodated in a spring receptacle, which is connected to a driver that covers the spring receptacle.

[0004] EP 1 365 143 A1 discloses a cable pulley with a spring receiving chamber in which a spring is accommodated. A driver also has a spring receiving chamber and is attached to the cable pulley with a screw and a washer.

[0005] From US 2005 / 0051127 A1 a spring housing is known which is covered with a cover plate which is fastened by means of screws in the holes provided in the spring housing and covers the connecting spring.

[0006] US 3,375,814 A discloses a spring receiving chamber with a cup-shaped cover. Extensions are formed on the cover, which, through a rotating movement, engage behind corresponding contours of the spring receiving chamber, allowing the cover to be secured to the spring receiving chamber.

[0007] The invention is based on the object of developing a generic spring housing in such a way that it can be designed in a simple, space-saving manner.

[0008] This object is achieved by a spring housing having the features of claim 1.

[0009] A further object of the invention is to provide a starting device with a spring housing which can be designed in a space-saving manner.

[0010] This object is achieved by a starting device having the features of claim 16.

[0011] In the spring housing according to the invention, the at least one first connecting means for securing the cover plate against movement relative to the base body in the direction of the central axis consists of an opening in the base body and an extension of the cover plate corresponding to the opening. According to the invention, the cover plate is secured against movement of the cover plate relative to the base body in the direction of the central axis of the spring housing by a first connecting means which is formed exclusively by the base body and the cover plate. No further components of the first connecting means are required to secure it against movement in the direction of the central axis. Consequently, no screw and thus no screw dome is required in the base body of the spring housing to secure the cover plate against movement in the direction of the central axis. This makes it possible to save installation space, in particular in the direction radial to the central axis.In particular, in the area of ​​the at least one first connecting means, the arrangement of a screw dome in the base body of the spring housing can be omitted. Further first connecting means of the cover plate and base body can also be formed exclusively by the base body and the cover plate or, alternatively, can comprise further elements formed separately from the base body and the cover plate.

[0012] The central axis is advantageously the rotational axis around which the spring housing rotates during operation of the starter device. The central axis advantageously extends through an access opening of the spring receiving chamber. The central axis runs, in particular, perpendicular to a floor of the spring receiving chamber.

[0013] According to the invention, the base body can be connected to the cover plate by a relative movement of the extension of the first connecting means relative to the opening of the first connecting means in a transverse direction transverse to the central axis such that the cover plate is secured against movement relative to the base body in the direction of the central axis. The transverse direction runs in particular perpendicular to the central axis.

[0014] In particular, the first connecting element can be installed without tools. This simplifies the assembly and disassembly of the cover plate and significantly reduces the time required for assembly and disassembly.

[0015] According to the invention, the first part of the at least one first connecting means is an opening in the base body and the second part of the first connecting means is an extension of the cover plate which corresponds to the opening in the base body. It is provided that the cover plate with the extension is inserted into the opening in the base body and is thus secured against movement in the direction of the central axis. Expediently, the opening penetrates the base body completely in the transverse direction, in particular perpendicular to the central axis. However, it can also be provided that the opening is merely designed as a recess in the base body. Expediently, the opening then only partially penetrates the base body in the transverse direction. In particular, when the cover plate and base body are connected, the extension protrudes beyond the spring receiving space in the transverse direction, transverse to the central axis, in particular in the direction perpendicular to the central axis.This allows the spring housing to be designed such that the cover plate covers the spring receiving space up to its edge and, at the same time, is secured against movement in the direction of the central axis by its extension in the opening of the base body. The extension expediently protrudes transversely beyond the spring receiving space, but advantageously not beyond an outer circumference of the base body of the spring housing. Particularly advantageously, an outer circumference of an outer wall of the spring receiving space lies radially outside the extension.

[0016] In an advantageous development of the invention, at least two first connecting means consisting merely of an opening in the base body and an extension on the cover plate are provided to secure the cover plate against movement relative to the base body in the direction of the central axis, said first connecting means being arranged in a circumferential angular range of less than 180°, in particular less than 135°, preferably less than 110°, measured in the connected state of the cover plate and base body with respect to the central axis. In particular, a plurality of extensions are provided. Advantageously, all extensions are arranged on the cover plate in the circumferential angular range of less than 180°, in particular less than 135°, preferably less than 110°, measured in the connected state of the cover plate and base body with respect to the central axis. All extensions of the cover plate advantageously extend completely into one half of the cover plate.The term "extension" refers exclusively to an extension that forms the first part of the first connecting means consisting of a first part on the base body and a second part on the cover plate.

[0017] The opening preferably has a closed, circumferential edge. The extension inserted into the opening is advantageously pre-tensioned against the edge of the opening. The extension inserted into the opening is pre-tensioned against the edge of the opening, particularly in the direction of the central axis.

[0018] In an advantageous development of the invention, it is provided that the extension of the cover plate in the opening rests with an upper side of the cover plate against an extension contact surface of the base body, and that the cover plate outside the opening rests with an underside of the cover plate on a support surface of the base body. As a result, the spring housing can be easily designed so that the cover plate is held in the base body without play in the direction of the central axis. The support surface expediently runs at an incline to an imaginary plane perpendicular to the central axis. As a result, the support surface can be designed such that the cover plate can be easily inserted into the opening in the base body and at the same time it is ensured that the cover plate rests with its underside on the support surface. The support surface advantageously forms a ramp along which the cover plate is guided when the extension is inserted into the opening.It is advisable for the underside of the cover plate to face the spring receiving space and the top side of the cover plate to face away from the spring receiving space.

[0019] In an advantageous development of the invention, in addition to the at least one first connecting means, the spring housing comprises a second connecting means formed separately from the at least one first connecting means, which secures the cover plate against movement relative to the base body in the transverse direction. This allows the cover plate to be easily secured against slipping out of the opening in the base body in the transverse direction. This makes it easy to ensure that the cover plate is secured against movement relative to the base body in the direction of the central axis. The second connecting means expediently comprises a screw spaced from the central axis.Advantageously, at least one, in particular all, of the first connecting means, consisting of a first part on the base body and a second part on the cover plate, is arranged in a first half of the spring housing. Advantageously, the second connecting means is arranged in a second half of the spring housing. The transverse direction runs from the second half of the spring housing to the first half of the spring housing.

[0020] In an advantageous development of the invention, it is provided that a circumferential wall of the spring receiving space running around the central axis has a smallest distance from the central axis, and that when the cover plate and base body are connected, the distance of an outer contour of the cover plate from the central axis in a contiguous angular range of at least 270°, in particular of at least 320°, is less than 110% of the smallest distance of the circumferential wall from the central axis. This allows the spring housing to be designed to save space in the direction radial to the central axis. Preferably, the radial extent of the spring housing in the region of the at least one extension is less than the radial extent required for the arrangement of a screw dome on the outer circumference of the spring housing.

[0021] In a particular embodiment of the invention, the spring housing is formed in one piece with a pulley for a starter rope for starting the combustion engine.

[0022] The cable pulley expediently has a recess with a base running around the central axis for receiving the starter cable. The contour of the base advantageously follows a circular shape over a continuous angular range of at least 270°. The base expediently has a constant distance from the central axis over the continuous angular range of at least 270°. The contour of a side edge of the recess advantageously follows a circular shape over the continuous angular range of at least 270°. This allows the recess for guiding the cable of a cable pulley to run unhindered in the area of ​​the at least one first connecting means consisting of a first part on the base body and a second part on the cover plate.In the area of ​​the at least one first connecting means, which consists of a first part on the base body and a second part on the cover plate, no screw bosses are required, which could potentially protrude into the recess and / or result in an increase in the outer diameter of the spring housing. This allows the starter cable to be wound and unwound in the recess in a space-saving manner, largely unhindered by irregularities.

[0023] Because no screw bosses are required for the first connecting means according to the invention, the peripheral wall of the spring receiving space can be designed to be thin over a large angular range, since no material is required there to form screw bosses. As a result, the spring housing according to the invention can be used in the area of ​​the cooling air flow of a working device, and the compactness of the spring housing ensures a good supply of cooling air.

[0024] The starter device according to the invention comprises a spring housing according to the invention. This allows the starter device to be designed in a space-saving manner.

[0025] Embodiments of the invention are explained below with reference to the drawings. They show: Fig. 1 a schematic side view of a motor chainsaw, Fig. 2 an exploded view of a starter device with a spring housing, Fig. 3 an exploded view of the spring housing from Fig. 2 with a base body and a cover plate, Fig. 4 to Fig. 8perspective views of the spring housing from Fig. 3 in connected or unconnected state of cover plate and base body, Fig. 9 and Fig. 10 Top views of the spring housing from Fig. 3 in connected and unconnected state of base body and cover plate, Fig. 11 a perspective view of the spring housing from Fig. 3, Fig. 12 a side view of the peripheral side of the spring housing from Fig. 3 , Fig. 13 a schematic side view of the peripheral side of an alternative embodiment of a spring housing, Fig. 14 a plan view from above of the spring housing from Fig. 3 in the connected state of the base body and cover plate, Fig. 15 a section along the Fig. 14 drawn section plane XV-XV, Fig. 16 a detailed view of the Fig. 15 area marked XVI, Fig. 17 a section along the Fig. 14 section plane marked XVII-XVII, Fig. 18 a detailed view of the Fig. 17 area marked XVIII.

[0026] Fig. 1shows a hand-held implement 61, in the exemplary embodiment a motor-driven chainsaw. The present invention can also be provided for another hand-held implement, for example a blower, a brush cutter, a cut-off grinder, or the like. The hand-held implement 61 has a housing 64 in which a schematically illustrated internal combustion engine 3 is arranged. The internal combustion engine 3 is preferably a single-cylinder engine, in particular a two-stroke engine or a mixture-lubricated four-stroke engine. The internal combustion engine 3 serves to drive a tool. In the exemplary embodiment, the tool is a saw chain 66 driven in rotation around a guide rail 67. A handle 62 and a handle tube 65 serve to guide the implement 61. A starter device 2 is provided for starting the internal combustion engine 3, which Fig. 1is also shown schematically. The starting device 2 is preferably a manually operated pull-cord starter. For this purpose, the starting device 2 comprises a starter handle 63 that protrudes from the housing 64 of the working device 61. The starting device 2 can alternatively or additionally be motor-driven.

[0027] In Fig. 2 The starter device 2 is shown in detail. The starter device 2 comprises a starter housing 68, a return spring 70, a spring housing 1, a connecting spring 77, and a driver 81. In the exemplary embodiment, the spring housing 1 has a cable pulley 72. The cable pulley 72 is an integral part of the spring housing 1. A separate design of the cable pulley and spring housing can also be provided.

[0028] The starter housing 68 has a bearing pin 69. The spring housing 1 and the driver 81 are rotatably mounted on the bearing pin 69. For this purpose, the spring housing 1 has a hub 73. The bearing pin 69 is inserted through the hub 73. The spring housing 1 and thus also the cable pulley 72 are connected to the starter housing 68 via the return spring 70. In the exemplary embodiment, the return spring 70 is a spiral spring. The return spring 70 is arranged between the starter housing 68 and the spring housing 1 in a return spring receptacle (not shown) of the spring housing 1 and is connected in a rotationally fixed manner at one end to the starter housing 68 and at its other end to the spring housing 1. The spring housing 1 is connected to the driver 81 via the connecting spring 77. The connecting spring 77 is advantageously a spiral spring. The connecting spring 77 is arranged between the spring housing 1 and the driver 81 in a spring receiving space 5 of the spring housing 1.The connecting spring 77 is arranged on the side of the spring housing 1 facing away from the return spring receptacle.

[0029] The starting device 2 is used to start the Fig. 1 shown combustion engine 3. On the pulley 72 is a Fig. 2 A starter cable (not shown) is wound around the starter cable. A first end of the starter cable is fixed to the cable pulley 72. A second end of the starter cable is led out of the starter housing 68 through a starter connection 74 of the starter housing 68. When starting the internal combustion engine 3, the operator pulls on the Fig. 1 The starter handle 63 shown is fixed to the second end of the starter cable. Pulling the starter cable moves the Fig. 2The cable pulley 72 shown, and thus also the spring housing 1, rotates around a rotational axis, which is referred to below as the central axis 50. The cable pulley 72 rotates around the bearing pin 69. The central axis 50 extends in an axial direction 49. The axial direction 49 runs from the return spring receptacle of the spring housing 1 in the direction of the spring receiving space 5 for receiving the connecting spring 77. A transverse direction 40 extends transversely, in the exemplary embodiment perpendicular to the central axis 50.

[0030] The rotational energy of the cable pulley 72 and the spring housing 1 is transferred to the driver 81 via the connecting spring 77. The connecting spring 77 serves to dampen jerky and uneven pulling movements. It can also be provided that the connecting spring 77 serves to temporarily store energy. In this case, it can be provided that the connecting spring must first be tensioned by several starter strokes on the starter cable before the connecting spring releases its stored energy to a crankshaft of the internal combustion engine via the driver. In this case, the cable pulley is typically connected to the spring housing via a freewheel.

[0031] The driver 81 has coupling means 82. In the exemplary embodiment, the coupling means 82 are designed as pawls. The coupling means 82 are pivotally mounted on the driver 81. During starting, the coupling means 82 pivot outward, guided by a locking contour 75, and interact with locking projections (not shown) that are connected in a rotationally fixed manner to the crankshaft, so that the crankshaft rotates along with the driver 81. If the crankshaft rotates faster than the driver 81, the coupling means 82 lose contact with the locking projections. At this point, the starting process is already complete, and the crankshaft is driven by the internal combustion engine 3.

[0032] The rotation of the pulley 72 during the starting stroke also tensions the return spring 70. After the starter stroke is completed, the pulley 72 and thus also the spring housing 1 are set in rotation by the return spring 70 in the opposite direction of their rotation when the starter cable is pulled, and the starter cable is wound back onto the pulley 72.

[0033] As in Fig. 3As shown, the spring housing 1 comprises a base body 4 and a cover plate 6. The spring receiving space 5 is formed in the base body 4. The spring receiving space 5 has a base 9. The base 9 extends in a plane. The central axis 50 runs perpendicular to the plane of the base 9 of the spring receiving space 5. The spring receiving space 5 has an access opening 15. The access opening 15 lies opposite the base 9 in the axial direction 49. The connecting spring 77 can be inserted into the spring receiving space 5 through the access opening 15. The access opening 15 extends radially to the central axis 50, advantageously as far as a peripheral wall 14 of the spring receiving space 5. The central axis 50 is the axis of rotation about which the spring housing 1 rotates during operation of the starter device 2. The central axis 50 runs through the access opening 15.To protect against contamination and for safe storage of the connecting spring 77, the cover plate 6 can be arranged on the base body 4 of the spring housing 1.

[0034] The base body 4 has an outer peripheral edge 16 extending around the central axis 50. The outer peripheral edge 16 extends in the circumferential direction 48 around the central axis 50. A circumferential recess 71 is arranged in the circumferential edge 16. The circumferential recess 71 in the circumferential edge 16 of the spring housing 1 forms the receptacle for the cable pulley 72 for the starter cable. The recess 71 recesses the circumferential edge 16 in a direction opposite to the radial direction of the central axis 50.

[0035] In the axial direction 49, adjacent to the recess 71, an opening 21 is arranged in the base body 4. In the exemplary embodiment, the opening 21 completely penetrates the base body 4 in the transverse direction 40. The opening 21 is arranged in an outer wall 29 of the base body 4. The outer wall 29 runs around the central axis 50. The opening 21 completely penetrates the outer wall 29 in the transverse direction 40. The opening 21 is arranged at least partially outside the spring receiving space 5 in the axial direction 49. In the exemplary embodiment, the outer wall 29 extends in line with the peripheral wall 14 of the spring receiving space 5. The opening 21 adjoins the spring receiving space 5 or its peripheral wall 14 in the axial direction 49.

[0036] The cover plate 6 has an extension 22. The extension 22 is part of a first connecting means 10, which consists exclusively of the base body 4 and the cover plate 6. The term "extension" refers exclusively to the part of the cover plate 6 that forms the first connecting means 10 with the base body 4. The extension 22 protrudes beyond a cover body 7 of the cover plate 6. The cover body 7 of the cover plate 6 is the area of ​​the cover plate 6 that covers the access opening 15 of the spring receiving space 5. The extension 22 of the cover plate 6 corresponds in terms of its position and size to the opening 21 of the base body 4. The extension 22 can be inserted into the opening 21. This allows the cover plate 6 and the base body 4 to be connected to one another. A first part is formed on the base body 4 through the opening 21, which, together with a second part formed by the extension 22 on the cover plate 6, forms the first connecting means 10.When the base body 4 and cover plate 6 are connected, the first connecting means 10 secures the cover plate 6 against movement relative to the base body 4 in the direction of the central axis 50 of the spring housing 1.

[0037] The Fig. 4 to 10show how the cover plate 6 is inserted into the base body 4. In this case, the base body 4 is connected to the cover plate 6 by a relative movement of the first part of the first connecting means 10 with respect to the second part of the first connecting means 10 in the transverse direction 40 such that the cover plate 6 is secured against movement relative to the base body 4 in the direction of the central axis 50. This is achieved by pushing the cover plate 6 with its extension 22 in the transverse direction 40 into the opening 21 of the base body 4. No tools are required for this. The first connecting means 10 can be installed without tools. The first connecting means 10 consists exclusively of the first part on the base body 4 and the second part on the cover plate 6. In particular, the cover plate 6 is secured against movement relative to the base body 4 in the direction of the central axis 50 by the first connecting means 10 without screws.The transverse direction 40 corresponds to an insertion direction of the extension 22 of the cover plate 6 into the opening 21 of the base body 4.

[0038] For example, the Figures 5 , 7 and 10 show the spring housing 1 in a connected state of cover plate 6 and base body 4. In the connected state of base body 4 and cover plate 6, the cover plate 6 at least partially covers the spring receiving space 5. As a result, the access opening 15 of the spring receiving space 5 is at least partially covered.

[0039] The cover plate 6 has a through-opening 17 in its center. When the cover plate 6 and the base body 4 are connected, the center axis 50 runs through the through-opening 17. The cover plate 6 advantageously completely encloses the through-opening 17. Fig. 2In the assembled state of the starter device 2, the driver 81 shown advantageously completely covers the through-opening 17 of the cover plate 6, except for the area of ​​the through-opening 17 in which the hub 73 is arranged. In the connected state of the base body 4 and cover plate 6, the spring receiving space 5 is thus almost completely closed.

[0040] As can be seen from the summary of the Fig. 9 and 10 The extension 22 is in the Fig. 10 shown connected state of cover plate 6 and base body 4 in the transverse direction 40 over the spring receiving space 5. As shown in the Fig. 5 and 8As shown, the extension 22 of the cover plate 6 projects into the opening 21 in the base body 4 when the base body 4 and cover plate 6 are connected. The opening 21 has a closed circumferential edge 23. The edge 23 of the opening 21 runs around the transverse direction 40. When the base body 4 and cover plate 6 are connected, the extension 22 is prestressed against the edge 23 of the opening 21. In order to prestress the extension 22 against the edge 23 of the opening 21 in the direction of the central axis 50, the spring housing 1 is designed such that the extension 22 of the cover plate 6 in the opening 21 rests with an upper side 11 of the cover plate on the edge 23 of the opening 21, and that at the same time the cover plate 6 rests outside the opening 21 with an underside 12 of the cover plate 6 on a support surface 8 of the base body 4.When the base body 4 and the cover plate 6 are connected, the cover plate 6 has contact with the base body 4 with both its underside 12 and its top side 11. Due to the contact on both sides, the cover plate 6 is fixed in the direction of the central axis 50. When the base body 4 and the cover plate 6 are connected, the top side 11 of the cover plate 6 faces away from the bottom 9 of the spring receiving space 5. When the base body 4 and the cover plate 6 are connected, the underside 12 of the cover plate 6 faces the bottom 9 of the spring receiving space 5 of the base body 4.

[0041] In the exemplary embodiments, the cover plate 6 has a clamping extension 13. The clamping extension 13 of the cover plate 6 protrudes beyond the cover body 7 of the cover plate 6. As in Fig. 10 As shown, the cover body 7 of the cover plate 6 in the connected state of the base body 4 and the cover plate 6 covers the Fig. 9The access opening 15 of the spring receiving space 5 shown is at least partially covered. The part of the cover plate 6 which, when the base body 4 and the cover plate 6 are connected, protrudes beyond the spring receiving space 5 in the direction of the central axis 50 is not part of the cover body 7. In other words, the cover body 7 is formed only by the part of the cover plate 6 which, when viewed in the direction of the longitudinal axis 50, does not protrude beyond the spring receiving space 5.

[0042] As in Fig. 10As shown, the clamping extension 13 protrudes in the transverse direction 40 beyond the cover body 7 of the cover plate 6. In the exemplary embodiments, the underside 12 of the cover plate 6 rests on the support surface 8 of the base body 4 when the base body 4 and the cover plate 6 are connected to the clamping extension 13 of the cover plate 6. It can also be provided that the underside 12 of the extension 22 inserted into the opening 21 rests against the edge 23 of the opening 21. In this case, the cover plate 6 rests outside the opening 21 with its upper side against a projection or opening in the base body 4. In any case, the extension 22 inserted through the opening 21 is prestressed in the direction of the central axis 50, i.e. either in the axial direction 49 or counter to the axial direction 49, relative to the part of the cover plate 6 that rests against the base body 4 outside the opening 21. This can be done, for example, as in the Figures 11 and 12 be realized in more detail.

[0043] As in Fig. 12 As shown, the edge 23 of the opening 21 in the base body 4 has an extension contact surface 24. The extension contact surface 24 faces the bottom 9 of the spring receiving space 5. The extension contact surface 24 is formed in the part of the edge 23 of the opening 21 that is furthest away from the bottom 9 of the spring receiving space 5. The extension contact surface 24 advantageously runs parallel to the bottom 9 of the spring receiving space 5. The upper side 11 of the extension 22 of the cover plate 6 rests against the extension contact surface 24 in an extension contact area. The extension contact surface 24 runs transversely, in the exemplary embodiment perpendicular to the axial direction 49 of the central axis 50. Contrary to the axial direction 49, the cover plate 6 is delimited by an imaginary plane E when the base body 4 and cover plate 6 are connected. The imaginary plane E is perpendicular to the central axis 50. The imaginary plane E is also in the Figures 16 and 18 shown.

[0044] As in Fig. 18 As shown, the extension contact area of ​​the extension contact surface 24 has a smallest distance a to the imaginary plane E.

[0045] The cover plate 6 lies in a clamping contact area on the Figures 12 and 16 shown support surface 8 of the base body 4. The clamping contact area of ​​the support surface 8 of the base body 4 has a greatest distance b to the imaginary plane E ( Fig. 16 ). The largest distance b of the clamping contact area of ​​the support surface 8 to the imaginary plane E is smaller in the embodiment than the smallest distance a of the extension contact area of ​​the extension contact surface 24 to the imaginary plane E. The cover plate 6 has a Figures 16 and 18shown thickness d. The thickness d of the cover plate 6 is constant in the exemplary embodiment. The sum of the thickness d of the cover plate 6 and the greatest distance b between the clamping contact area of ​​the support surface 8 and the imaginary plane E corresponds at least to the smallest distance a between the extension contact area of ​​the extension contact surface 24 and the imaginary plane E. This ensures that the extension 22 is pre-tensioned with its upper side 11 in the connected state of the base body 4 and cover plate 6 in the axial direction 49 against the extension contact surface 24 of the edge 23 of the opening 21 of the base body 4. In this way, the cover plate 6 is clamped with the extension 22 in the opening 21 of the base body 4. As a result, the cover plate 6 is pre-fixed against unintentional withdrawal from the opening 21 of the base body 4 counter to the transverse direction 40.When the spring housing 1 rotates, the clamping of the cover plate 6 in the base body 4 prevents the cover plate 6 from vibrating. This reduces wear.

[0046] Fig. 15 shows a section along the Fig. 14 drawn section plane XV-XV. The section plane XV-XV contains the support surface 8 and runs through the central axis 50. The section plane XV-XV also contains a second connecting element 20. As in Fig. 15As can be seen, the support surface 8 runs inclined to the imaginary plane E. The support surface 8 has a smallest distance a1 to the central axis 50, measured in the transverse direction 40. The support surface 8 has a greatest distance a2 to the central axis 50, measured in the transverse direction 40. The support surface 8 has a smallest distance d1 to the bottom 9 of the spring receiving space 5, measured in the axial direction 49. The support surface 8 has a greatest distance d2 to the bottom 9 of the spring receiving space 5, measured in the axial direction 49. The support surface 8 has its greatest distance d2 to the bottom 9 at the point of the greatest distance a2 to the central axis 50. The support surface 8 has its smallest distance d1 to the bottom 9 at the point of the smallest distance a1 to the central axis 50. The distance d1, d2 measured in the axial direction 49 between the bottom 9 of the spring receiving space 5 and the support surface 8 increases in particular with increasing distance a1, a2 from the central axis 50.This increase advantageously occurs continuously. Due to this inclination of the support surface 8, the tensioning extension 13 can be easily pushed onto the support surface 8 in the transverse direction 40. As shown in . Fig. 15 As shown, the clamping extension 13 is raised in the axial direction 49 in comparison to the cover body 7 of the cover plate 6. This is also shown in the detailed illustration Fig. 16can be seen. The clamping extension 13 rests with its underside 12 on the support surface 8 of the base body 4. The support surface 8 has an axial distance from the imaginary plane E at its greatest distance d2 from the base 9. The support surface 8 can also comprise a section in which the surface runs parallel to the plane E. In this case, the clamping extension 13 of the cover plate 6, when the base body 4 and cover plate 6 are connected, rests on the support surface 8 at least at the transition between the area inclined with respect to the imaginary plane E and the section in which the support surface 8 runs parallel to the plane E.

[0047] The Fig. 17 shows a section along the Fig. 14 shown section plane XVII-XVII. The section plane XVII-XVII runs in the transverse direction 40 and contains the extension 22. The section plane XVII-XVII runs parallel to the section plane XV-XV. The section plane XVII-XVII does not contain the central axis 50. As shown in the Figs. 17 and 18 As shown, the extension 22 rests with its upper side 11 on the extension contact surface 24 of the edge 23 of the opening 21 of the base body 4. Due to the Figs. 15 and 16 The inclined support surface 8 shown, which presses the clamping extension 13 upward in the axial direction 49, presses the extension 22 in the axial direction 49 against the extension contact surface 24. Movement of the extension 22 in the axial direction 49 is limited by the extension contact surface 24. This holds the cover body 7 on the base body 4.

[0048] This is particularly the case if - as in all embodiments with the exception of the embodiment according to Fig. 13 - a second extension 25 is provided on the cover plate 6 and a second opening 26 is provided in the base body 4. This is shown, for example, in the Fig. 6 and 10clearly visible. In the circumferential direction 48, the support surface 8 is arranged between the opening 21 and the second opening 26. In the connected state of the base body 4 and cover plate 6, the upper side 11 of the cover plate 6 rests in the region of the second extension 25 against the second opening 26, as described for the extension 22 with respect to the opening 21. The second extension 22 corresponds to the opening 26. The cover plate 6 is in the connected state of the base body 4 and cover plate 6, as in Fig. 10As can be seen, it is advantageously mirror-symmetrical with respect to a plane spanned by the transverse direction 40 and the axial direction 49, which plane contains the central axis 50. Accordingly, the support surface 8 for the clamping extension 13 is arranged mirror-symmetrically in the circumferential direction 4 between the two openings 21 and 26. The cover plate 6 can be mounted in a reversible manner. The underside 12 of the cover plate 6 can function as the upper side of the cover plate 6 after the cover plate 6 has been turned. The cover plate 6 can be mounted on the base body 4 with the underside 12 facing the spring receiving space 5 or with the underside 12 facing away from the spring receiving space 5.

[0049] The support surface 8 has a center 31 with respect to the circumferential direction 48. The transverse direction 40 runs from the central axis 50 towards the center 31. The two openings 21 and 26 are also mirror-symmetrical with respect to the plane spanned by the transverse direction 40 and the axial direction 49, which plane contains the central axis 50. The geometric design of the cover plate 6 and the corresponding arrangement of the two openings 21 and 26 in the base body 4 prevents the cover plate 6 from tilting about an axis in the transverse direction 40 when the extensions 22 and 25 are pretensioned. The cover plate 6 is mirror-symmetrical, at least with respect to functionally relevant contours. The axis of symmetry of the cover plate 6 is oriented in the transverse direction 40. In this way, the cover plate 6 can be mounted rotated 180° around the transverse direction 40.

[0050] The adjacent extensions 22 and 25 are arranged on the cover plate 6 in a circumferential angular range α of less than 180°, measured in the connected state of the cover plate 6 and base body 4 with respect to the central axis 50. The circumferential angular range α is measured in a plane perpendicular to the central axis 50. All extensions 22, 25 therefore extend in one half of the cover plate 6. Preferably, all extensions 22, 25 and all clamping extensions 13 extend in one half of the cover plate in the specified circumferential angular range α. Preferably, the contiguous circumferential angular range α is less than 135°. In the exemplary embodiment, the contiguous circumferential angular range α is less than 100°. As a result, the cover plate 6 can be designed such that it can be easily inserted into the openings 21 and 26 in the transverse direction 40.For this purpose, the extensions 22 and 25 are shaped and arranged such that they can be inserted into the openings 21 and 26 in the transverse direction 40.

[0051] As can be seen from a summary of the Fig. 9 and 10 The spring receiving space 5 is bounded in the radial direction to the central axis 50 by the peripheral wall 14 of the base body 4. The peripheral wall 14 of the spring receiving space 5 runs around the central axis 50. As in Fig. 10shown, the peripheral wall 14 has a smallest distance k from the central axis 50. The cover plate 6 is delimited in the direction radially to the central axis 50 by an outer contour 18 of the cover plate 6. The outer contour 18 of the cover plate 6 runs around the central axis 50 when the cover plate 6 and the base body 4 are connected. When the cover plate 6 and the base body 4 are connected, a distance a3 of the outer contour 18 of the cover plate 6 from the central axis 50 in a continuous circumferential angular range β of at least 270° is less than 120% of the smallest distance k. In the exemplary embodiment, the distance a3 of the outer contour 18 of the cover plate 6 from the central axis 50 in a continuous circumferential angular range β of at least 320° is less than 110% of the smallest distance k. In the continuous angular area β, no holes are provided for the passage of screws in the cover plate 6.As a result, the cover plate 6 can be designed to be compact in the continuous angular range β in the direction radial to the central axis 50.

[0052] As in the Figures 7 and 8 As shown, the recess 71 of the pulley 72 has a base 76. The recess 71 has a side edge 79. The side edge 79 borders the base 76. The side edge 79 delimits the recess 71 in the direction opposite to the axial direction 49. From the overview of the Figures 7 , 8 and 10 It can be seen that the contour of the base 76 follows a circular shape in the continuous angular range β of at least 270°. Figures 7 , 8 and 10 It can be seen that the contour of the side edge 79 follows a circular shape in the continuous angular range β of at least 270°.

[0053] As in Fig. 10As shown, the extension 22, or the second extension 25, of the first connecting means 10 does not protrude beyond an outer peripheral wall of the base body 4 of the spring housing 1 in the continuous angular range β of at least 270° in the radial direction to the central axis 50. In particular, the extension 22, or the second extension 25, 10, ends in the continuous angular range β of at least 270° within the wall thickness of the outer wall 29 of the base body 4.

[0054] For example, in Fig. 15As shown, the spring housing 1 comprises, in addition to the first connecting means 10 formed by the first part on the base body 4 and the second part on the cover plate 6, the second connecting means 20. The second connecting means 20 secures the cover plate 6 against movement relative to the base body in the transverse direction 40. The second connecting means 20 comprises a further fastening element. The further fastening element is formed separately from the base body 4 and separately from the cover plate 6. In the exemplary embodiment, the further fastening element comprises a screw 28. However, any other second connecting means can also be provided which secures the cover plate 6 against movement relative to the base body in the transverse direction 40, for example a materially bonded connection or a connection by hot caulking. The screw 28 is at a distance from the central axis 50. The base body 4 has an internal thread 27.The internal thread 27 is provided to receive the screw 28. The cover plate 6 has a hole 19 for the passage of the screw 28. When the base body 4 and cover plate 26 are connected, the position of the hole 19 in the cover plate 6 corresponds to the position of the internal thread 27 in the base body 4. When the base body 4 and cover plate 6 are connected, the screw 27 can be screwed through the hole 19 of the cover plate 6 into the internal thread 27 of the base body 24. In this way, the screw 27 secures the cover plate 6 against movement counter to the transverse direction 40. In addition to clamping the cover plate in the openings 21 and 26, this also secures the cover plate 6 against being pulled out of the openings 21 and 26 counter to the transverse direction 40. If at least a second connecting means 20 is provided, the bracing of the cover plate 6 relative to the base body 4 can also be omitted.The at least one extension can therefore also be loosely inserted into the at least one opening. In the exemplary embodiments, the internal thread 27 of the support surface 8 is arranged opposite the transverse direction 40 with respect to the central axis 50 in the base body 4. The first connecting means 10, which consist of a first part on the base body 4 and a second part on the cover plate 6, and the second connecting means 20, which comprises a further fastening element, are advantageously arranged such that no or only a slight imbalance arises when the spring housing 1 rotates about the central axis 50. In . Fig. 10 It can be seen that the material accumulation of the base body 4 for forming the opening 21, or the opening 26, is arranged opposite the material accumulation of the base body 4 for forming a suspension point 78 for the connecting spring 77 and, if applicable, a rope knot.

[0055] The screw dome for the second connecting means 20 is arranged in an angular region of the spring housing 1 in which the spring housing diameter is already enlarged due to the suspension point 78 designed as a suspension slot for the connecting spring 77. In this way, the spring housing radius does not need to be enlarged at an additional location, which promotes the flow of cooling air past the spring housing.

[0056] Fig. 13 shows an alternative design of the spring housing 1. In the spring housing according to Fig. 13Only a single opening 21 is provided for receiving an extension in the base body 4. On each side of the opening 21, a support surface 8 for a respective clamping extension 13 is provided with respect to the circumferential direction 48. The two clamping extensions 13 are arranged at the same location on the cover plate 6 as the two extensions 22 and 25 in the exemplary embodiments according to the other figures. The statements regarding the two extensions 22 and 25 with respect to the exemplary embodiment according to the other figures apply analogously with respect to the arrangement of the two clamping extensions 13. Likewise, the statements regarding the openings 21 and 26 for the exemplary embodiment according to the other figures apply analogously with respect to their position and arrangement for the support surface 8 of the exemplary embodiment according to Fig. 13 . In simple terms, it can be said that in comparison to the embodiment according to the other figures, in the embodiment according to Fig. 13the openings 21 and 26 are replaced by support surfaces 28 and that the extensions 22 and 25 are replaced by clamping extensions 13.

[0057] Further advantageous embodiments result from any combination of the embodiments.

Claims

1. Spring housing for a connecting spring of a starting device for starting a combustion engine, wherein the spring housing (1) comprises a main body (4), with a spring receiving space (5), and a cover plate (6) for at least partially covering the spring receiving space (5), wherein the cover plate (6) and the main body (4) are connectable to one another via at least one first connecting means (10), wherein the at least one first connecting means (10) secures the cover plate (6) against movement relative to the main body (4) in the direction of a central axis (50) of the spring housing (1), characterized in that the at least one first connecting means (10) consists of an opening (21, 26) in the main body (4) and an extension (22, 25), corresponding to the opening (21, 26), of the cover plate (6), in that the extension (22, 25) is pluggable into the opening (21, 26), in that the main body (4) is connectable to the cover plate (6), by way of a relative movement of the extension (22, 25) of the first connecting means (10) with respect to the opening (21, 26) of the first connecting means (10) in a transverse direction (40) transverse to the central axis (50), in such a way that the cover plate (6) is secured against movement relative to the main body (4) in the direction of the central axis (50), which is achieved in that the extension (22, 25) of the cover plate (6) is pushed into the opening (21) in the transverse direction (40).

2. Spring housing according to Claim 1, characterized in that the at least one first connecting means (10) is fittable without tools.

3. Spring housing according to Claim 1 or 2, characterized in that the opening (21, 26) extends completely through the main body (4) in the transverse direction (40) transverse to the central axis (50).

4. Spring housing according to one of Claims 1 to 3, characterized in that, in the connected state of the cover plate (6) and the main body (4), the extension (22, 25) protrudes beyond the spring receiving space (5) in the transverse direction (40) transverse to the central axis (50).

5. Spring housing according to one of Claims 1 to 4, characterized in that provision is made of at least two first connecting means (10) which are arranged in a circumferential angle range (α) of less than 180° as measured in relation to the central axis (50) in the connected state of the cover plate (6) and the main body (4).

6. Spring housing according to one of Claims 1 to 5, characterized in that the opening (21, 26) has a closed peripheral edge (23).

7. Spring housing according to one of Claims 1 to 6, characterized in that the extension (22, 25) plugged into the opening (21, 26) is preloaded against the edge (23) of the opening (21, 26).

8. Spring housing according to Claim 7, characterized in that the extension (22, 25) of the cover plate (6), in the opening (21, 26), bears by way of a top side (11) of the cover plate (6) against an extension bearing surface (24) of the main body (4), and in that the cover plate (6), outside the opening (21, 26), bears by way of a bottom side (12) of the cover plate (6) on a bearing surface (8) of the main body (4).

9. Spring housing according to Claim 8, characterized in that the bearing surface (8) is inclined in relation to an imaginary plane (E) perpendicular to the central axis (50).

10. Spring housing according to one of Claims 1 to 9, characterized in that, besides the at least one first connecting means (10), the spring housing (1) comprises a second connecting means (20) which secures the cover plate (6) against movement relative to the main body (4) in the transverse direction (40) transverse to the central axis (50).

11. Spring housing according to one of Claims 1 to 10, characterized in that the second connecting means (20) comprises a screw (28) which has a spacing to the central axis (50).

12. Spring housing according to one of Claims 1 to 11, characterized in that the spring housing (1) is formed in one piece with a rope pulley (30) for a starting rope for starting the combustion engine (3).

13. Spring housing according to Claim 12, characterized in that the rope pulley (30), for receiving the starting rope, has a depression (71) which runs around the central axis (50) in an encircling manner and which has a base (76), and in that the contour of the base (76) follows a circular shape over a continuous angle range (β) of at least 270°.

14. Starting device having a spring housing (1) according to one of Claims 1 to 13.