GEARBOX WITH ANGULAR GEAR STAGE AND METHOD FOR MANUFACTURING AN ANGULAR GEAR STAGE

Description

[0001] The invention relates to a transmission with an angular gear stage and a method for producing an angular gear stage.

[0002] It is generally known that an angular gear stage of a transmission has a toothed part and a gear, wherein the toothing of the toothed part is in engagement with the toothing of the gear.

[0003] From the EP 3 072 785 A1 The closest state of the art is a steering column assistance system. The document EP 3072 785 A1 discloses a transmission which has a gear wheel and a toothed part which is connected to an input shaft of the transmission in a rotationally fixed manner and / or is designed in one piece, in particular in one part, 1 wherein the teeth of the gear wheel and the teeth of the toothed part are in engagement with one another, wherein the shaft and / or the toothed part is mounted via bearings which are received in a second bushing, wherein the second bushing is received in a first bushing, wherein the first bushing is received in a housing part, wherein the first bushing has an externally cylindrically shaped region, the cylinder axis of which is spaced apart from and parallel to a cylinder axis of an internally cylindrically shaped region of the first bushing, on which the second bushing is received and / or bears, wherein the second bushing has an externally cylindrically shaped region, the cylinder axis of which is spaced apart from and parallel to a cylinder axis of an internally cylindrically shaped region of the second bushing, in particular on which the bearings are received.

[0004] From the US 4 035 044 A a bearing arrangement is known. A steering column assistance system is also known from EP 2 695 796 A2. A power transmission device is known from DE 10 2013 002310 A1.

[0005] The invention is therefore based on the object of making an angular gear stage easy to manufacture.

[0006] According to the invention, the object is achieved in the angular gear stage according to the features specified in claim 1.

[0007] Important features of the invention in the gearbox with angular gear stage are that it has a gear and a toothed part that is connected to a shaft, in particular the input shaft of the gearbox, in a rotationally fixed manner and / or is designed in one piece, in particular in one part, in particular wherein the teeth of the gearwheel and the teeth of the toothed part are in engagement with one another, wherein the shaft and / or the toothed part is mounted via bearings which are received in a second bushing, wherein the second bushing is received in a first bushing, wherein the first bushing is received in a housing part, wherein the first bushing has an externally cylindrically shaped region, the cylinder axis of which is spaced apart from and parallel to a cylinder axis of an internally cylindrically shaped region of the first bushing, in particular on which the second bushing is received and / or bears, wherein the second bushing has an externally cylindrically shaped region, the cylinder axis of which is spaced apart from and parallel to a cylinder axis of an internally cylindrically shaped region of the second bushing, in particular on which the bearings are received.

[0008] The advantage here is that two eccentric bushings accommodate the shaft bearing and thus the shaft can be moved. In particular, when the two bushings are rotated against each other, a linear displacement is possible and thus an adjustment of the distance along a line.

[0009] According to the invention the first bushing has a radially projecting collar region in which axially continuous recesses, in particular elongated holes, are made,

[0010] In particular, the elongated holes are arranged at the same radial distance. The advantage here is that after adjusting the distance with a screw, the collar areas and thus also the bushings can be fixed.

[0011] According to the inventionThe second bushing has a radially protruding collar region in which axially continuous recesses, in particular elongated holes, are provided, in particular with the elongated holes being arranged at the same radial distance. The advantage here is that after adjusting the distance by means of a screw, the collar regions and thus also the bushings can be secured.

[0012] In an advantageous embodiment, the radial spacing area covered by the recesses of the first bushing comprises, is equal to, or overlaps the radial spacing area covered by the recesses of the second bushing. Advantageously, the second bushing is accommodated within the first bushing.

[0013] According to the invention a screw part is passed through one of the recesses in the collar of the first bushing and through one of the recesses in the collar of the second bushing,

[0014] In particular, the screw part is at least partially screwed into a threaded bore of the housing part, wherein a screw head of the screw part or a nut screwed onto the screw part presses the collar of the first bushing onto the collar of the second bushing, in particular the collar of the second bushing is pressed onto the housing base. It is advantageous that the two collars can be fastened together.

[0015] Important features of the method for producing an angular gear stage are that, before fixing the bushings by tightening the screw part and / or the nut, the rotational position of the first and second bushings is adjusted in such a way that, with a constant distance between the axis of rotation of the toothed part, in particular bevel gear, and the axis of rotation of the gear, the distance between the axis of rotation of the toothed part and the gear is adjusted, in particular changed.

[0016] The advantage here is that it can be easily attached using the screw part.

[0017] According to the invention The constant distance between the rotational axis of the toothed part and the rotational axis of the gear is maintained by rotating the first bushing in a mutually dependent manner with the rotation of the second bushing, in particular by ensuring that the rotational position of the first bushing is dependent on the rotational position of the second bushing. The advantage here is that a linear change in the distance is possible.

[0018] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0019] The invention will now be explained in more detail using schematic illustrations: In the Figure 1 is a cross-section through an angular gear stage of a section of a gearbox comprising a crown gear 1 and a bevel gear 2. In the Figure 2 An oblique view of the angular gear stage is shown. Figure 3 The maximum achievable displacement Y_max is represented by two mutually extreme rotational positions of two bushings (3, 4) of the angular gear stage. Figure 4 A side view of the angular gear stage is shown. Figure 5 a cross-section through the angular gear stage is shown, which includes the axis of the bevel gear 2. In the Figure 6 is an oblique view of the first of the sockets 3. In the Figure 7 A top view of the first of the sockets 3 is shown. In the Figure 8is an oblique view of the second of the sockets 4. In the Figure 9 A top view of the second of the sockets 4 is shown. In the Figure 10 a longitudinal section through the angular gear stage of the gearbox section is shown.

[0020] As shown in the figures, a transmission according to the invention has an angular gear stage, in particular a hypoid stage.

[0021] The angular gear stage has a bevel gear 2, the teeth of which mesh with the teeth of the ring gear 1 of the angular gear stage.

[0022] The ring gear 1 is connected in a rotationally fixed manner to a shaft of the transmission, in particular to the output shaft of the transmission, and is mounted via bearings in a housing part 6 of the transmission, wherein the housing part 6 can be designed in one part or in several parts.

[0023] The bevel gear 2 is connected in a rotationally fixed manner to the shaft 5, in particular the input shaft 5 of the transmission, and is mounted via bearings in a second bushing 4, which is received in a first bushing 3, which is received in a continuous recess of the housing part 6.

[0024] During assembly, the second bushing 4 is arranged to be rotatable relative to the first bushing 3. For this purpose, an outer cylindrical portion of the second bushing 4 abuts the inner cylindrical portion of the first bushing 3. Likewise, an outer cylindrical portion of the first bushing 3 abuts the recess of the housing part 6, which is designed as a bore, in particular, is shaped as an inner cylindrical portion.

[0025] The bushings 3 and 4 each have a radially projecting collar at their respective axial end region, in which axially continuous elongated holes 7 and recesses 8 are provided, into which a tool can engage to cause rotation of the respective bushing (3, 4).

[0026] The radial distance range covered by the collar of the first bushing 3 encompasses the radial distance range covered by the collar of the second bushing 4. Furthermore, the axial range covered by the collar of the first bushing 3 encompasses the axial range covered by the collar of the second bushing 4. Thus, the collar of the first bushing 3 encompasses the collar of the second bushing 4.

[0027] The bushing 3 is eccentrically designed. For this purpose, the cylinder axis of the outer cylindrical portion of the first bushing 3 is spaced from the cylinder axis of the inner cylindrical portion of the first bushing 3, with these two cylinder axes aligned parallel to each other. The spacing of the two cylinder axes is less than one-tenth of the diameter of the outer cylindrical portion of the first bushing 3. Thus, when the first bushing 3 rotates about the cylinder axis of the outer cylindrical portion, the cylinder axis of the inner cylindrical portion moves on a circle whose radius corresponds to the spacing.

[0028] The second bushing 4 is also eccentrically designed. For this purpose, the cylinder axis of the outer cylindrical region of the second bushing 4 is spaced from the cylinder axis of the inner cylindrical region of the second bushing 4, with these two cylinder axes being aligned parallel to one another. The spacing of the two cylinder axes is less than one-tenth of the diameter of the outer cylindrical region of the second bushing 3. Thus, when the second bushing 4 rotates about the cylinder axis of the outer cylindrical region, the cylinder axis of the inner cylindrical region moves on a circle whose radius corresponds to the spacing, with the normal of the circular plane belonging to the circle being parallel to the cylinder axes.

[0029] The area covered in the axial direction by the inner cylindrically shaped area of the second bushing 4 also includes the area covered in the axial direction by the outer cylindrically shaped area of the second bushing 4.

[0030] The area covered in the axial direction by the inner cylindrically shaped area of the first bushing 3 also includes the area covered in the axial direction by the outer cylindrically shaped area of the first bushing 3.

[0031] As in Figure 2 , 3 , 5 , 6 to 9 As shown, the collars have through-holes such that a screw can be passed through in the axial direction and thus the two collars can be pressed together against the housing part 6. The screw head of the screw presses on the collar of the first bushing 3, which in turn presses on the collar of the second bushing 4, which presses against a bearing surface on the housing part.

[0032] Thus, when the rotations of the first bushing 3 and the second bushing 4 are completed during production, the screw passed through the elongated holes is screwed with its threaded portion into the threaded hole made in the housing part 6. The threaded hole is directed in the axial direction.

[0033] The slots of the first and second bushings (3, 4) are thus arranged at the same radial distance and overlap each other in the circumferential direction. In the axial direction, the slots of the first bushing (3) border the slots of the second bushing (4).

[0034] As in Figure 10 As shown, the distance Y, i.e. the distance between the bevel gear 2 and the ring gear 1 in the direction of the axis of the ring gear 1, is to be adjusted by bringing the first bushing 3 and second bushing 4 into a corresponding rotational position.

[0035] If the rotational positions of the two bushings 3 and 4 are suitably designed in mutual dependence, it is possible to vary the distance Y between the two extreme values +Y_max and -Y_max, particularly linearly. Thus, the distance X remains constant while the distance Y changes.

[0036] As in Figure 1 in conjunction with Figure 10 As clearly shown, with a constant distance X, the change in the distance Y causes a displacement of the axis of rotation of the toothed part 2 in a plane which is spaced by the distance X from the axis of rotation of the gear 1 and which is parallel to the axis of rotation of the gear 1.

[0037] In Figure 10The conical continuation of the toothing envelope of the toothed part 2 and the conical continuation of the toothing envelope of the gear 1 are shown in dashed lines. Thus, the axis of rotation of the toothed part 2 is spaced from the actual gear 1, with this distance being the distance Y to be set during assembly of the gear.

[0038] Preferably, an electric motor driving the shaft 5 of the geared part 2 is centered and / or fixed with its housing on the second bushing 4. Thus, the geared part 2 is correctly aligned with the motor—in particular, regardless of the distance Y.

[0039] As in Figures 6 to 9 As shown, the elongated holes 7 are regularly spaced from one another in the circumferential direction and are each designed in the same way, in particular they each cover the same circumferential angle range in the circumferential direction.

[0040] The first bushing 3 is formed as a hollow part, with the collar region protruding radially at the end region axially remote from the toothed part 2. Thus, the collar region rests against the housing part 6 and thus also functions as an axial limit.

[0041] The second bushing 4 is formed as a hollow part, with the collar region protruding radially at the end region axially remote from the toothed part 2. Thus, the collar region of the second bushing 4 abuts the collar region of the first bushing 3 and thus delimits the second bushing 4.

[0042] Since both bushings (3, 4) are still rotatable during manufacture, i.e. before tightening the screw through the elongated holes, the rotational positions can be adjusted in mutual dependence in such a way that the Figure 1 shown distance X, i.e. the distance between the axis of rotation of the bevel gear 2 and the axis of rotation of the ring gear 1, remains constant.

[0043] Thus, a pure change in distance Y can be achieved without changing distance X.

[0044] However, if the distance X also needs to be adjusted slightly, for example to compensate for manufacturing tolerances, this can also be done by selecting the appropriate values for the two rotational positions.

[0045] Two bearings are accommodated in the second bushing 4, the outer rings of which touch the inner cylindrically shaped area of the second bushing 4 and are axially spaced from one another by means of a thickening projecting radially inwards.

[0046] The bevel gear 2 is connected to the shaft 5, i.e. the input shaft 5, in a rotationally fixed manner, in particular as an insert pinion and / or with a key connection.

[0047] In addition, a shaft seal is accommodated in the internally cylindrical area of the second bushing 4, the sealing lip of which runs on the shaft 5.

[0048] Preferably, the crown gear 1 is made of bronze or steel, and the bevel gear 2 is preferably made of steel. The bevel gear preferably has a toothing such that the angular gear stage can be designed as a hypoid stage.

[0049] The gearbox is preferably designed as a two-stage or multi-stage unit. The crown gear is non-rotatably connected to a shaft, which in turn is non-rotatably connected to another gearing component, particularly an involute-toothed spur gear, of another gear stage of the gearbox.

[0050] In further embodiments according to the invention, the aforementioned bushings 3 and 4 can each also be referred to as sleeves.

[0051] The respective outer cylindrical region is characterized by a cylindrical surface. The inner cylindrical region is also characterized by a cylindrical surface.

[0052] In further embodiments of the invention, the angular gear stage is designed as a bevel gear stage. Alternatively, the angular gear stage is designed as a spiroplan gear stage, in which case the bevel gear is designed as a spiroplan pinion and the ring gear has correspondingly curved teeth. List of reference symbols

[0053] 1 Ring gear 2 Bevel gear 3 First bushing, in particular first eccentric bushing 4 Second bushing, in particular second eccentric bushing 5 Shaft, in particular input shaft 6 Housing part 7 Slot for fastening screw 8 Recess for tool

Claims

1. A gear unit with a right-angled gear stage, which has a gear wheel (1) and a gearing part (2) which is non-rotatably connected to, and / or embodied in one piece, in particular in one part, with, a shaft (5), in particular input shaft (5) of the gear unit, of the right-angled gear stage, in particular wherein the gearing of the gear wheel and the gearing of the gearing part are engaged with each other, wherein the shaft (5) and / or the gearing part is / are borne by way of bearings of the right-angled gear stage which are received in a second bush (4) of the right-angled gear stage, wherein the second bush (4) is received in a first bush (3) of the right-angled gear stage, wherein the first bush (3) is received in a housing part (6) of the right-angled gear stage, wherein the first bush (3) has an externally cylindrically shaped region, the cylinder axis of which is spaced apart from and parallel to a cylinder axis of an internally cylindrically shaped region of the first bush (3), in particular on which region the second bush (4) is received and / or rests, wherein the second bush (4) has an externally cylindrically shaped region, the cylinder axis of which is spaced apart from and parallel to a cylinder axis of an internally cylindrically shaped region of the second bush (4), on which region the bearings are received, wherein the first bush (3) has a radially projecting collar region in which are formed axially uninterrupted elongate holes (7), wherein the elongate holes are arranged on the same radial distance region in each case, wherein the second bush (4) has a radially projecting collar region in which are formed axially uninterrupted elongate holes (7) which are arranged on the same radial distance region in each case, the elongate holes of the first and second bush (3, 4) are arranged at the same radial distance and overlap each other in the circumferential direction, wherein in the axial direction the elongate holes of the first bush (3) adjoin the elongate holes of the second bush (4), wherein a screwing part is passed through one of the elongate holes in the collar of the first bush (3) and through one of the elongate holes in the collar of the second bush (4).

2. A gear unit with a right-angled gear stage according to claim 1, characterised in that the radial distance region covered by the elongate holes in the first bush (3) encompasses, is identical to or overlaps with the radial distance region covered by the elongate holes in the second bush (4).

3. A gear unit with a right-angled gear stage according to one of claims 1 or 2, characterised in that the screwing part is at least partially screwed into a threaded bore in the housing part (6), with a screw head of the screwing part or a nut screwed onto the screwing part pressing the collar of the first bush onto the collar of the second bush, in particular which collar is pressed onto the lower housing part.

4. A method for producing a gear unit with a right-angled gear stage according to at least one of the preceding claims, wherein, prior to fixing the bushes by means of tightening the screwing part and / or the nut, the rotary positions of the first (3) and second (4) bush are set such that, while the distance in the X direction of the axis of rotation of the gearing part (2), in particular bevel gear (2), from the axis of rotation of the gear wheel is constant, the distance in the Y direction between the axis of rotation of the gearing part and the gear wheel is set, i.e. is changed, wherein the constant distance in the X direction of the axis of rotation of the gearing part from the axis of rotation of the gear wheel is maintained in that the first bush is rotated in mutual dependence on the rotation of the second bush, therefore the rotary position of the first bush is brought about dependent on the rotary position of the second bush.