Bolt for bevel gear differential with more than 2 differential gears

Abstract

According to the invention, a bevel gear differential (1) with a bolt star (2) for receiving differential gears (3) is proposed, wherein the bolt star (2) has at least three cylindrical bolt parts (4), wherein the bolt parts (4) are connected to one another in order to form the common bolt star (2), wherein each bolt part (4) has the same engagement contour (5) in section at the end, wherein the engagement contours (5) of all bolt parts (4) form an assembly of the bolt star (2) from the at least three bolt parts (4) when the bolt parts (4) engage with one another.

Description

The invention relates to a bevel gear differential having a component which accommodates the differential gears and to this component itself.US 2007 / 0 270 275 A1 discloses with paragraph

[0024] that the bevel gears 16 are each accommodated by pins 24, so that the bevel gears 16 can rotate via the axis of the pins 24 and the pins 24 can rotate with the bevel gears 16 via the axis 12.DE 103 33 747 A1 discloses, with paragraph

[0021] , an embodiment, not shown, of the differential axle assembly having three differential gears, wherein each differential gear is mounted on one of three ends of a differential pin arranged at uniform distances.DE 199 43 920 A1 shows a bevel gear differential for commercial vehicles with a differential pinion bearing differential pinion, wherein the differential pinion is composed of four identically designed bolts which, toward the center of the differential pinion, bear against one another in a fixing manner with a contact contour designed in a form-fitting manner with respect to one another and which are axially supported on the radially outer side by supports.DE 601 05 146 T2 shows a differential gear. When the differential gear is in operation and driving force is thus transmitted from the ring gear to the wheel drive shafts, the balance pins are subjected to bending load (bending moments and power effects) caused by forces from the balance bevel gears, so that each balance pin requires support in both a wall portion of the surrounding balance housing and the center of the balance housing. The inner ends of the balance pins (at the center of the space within the balance housing) are wedge-shaped with 90° tip angles between the tip surfaces forming the wedge tip and the wedge-shaped inner ends of the pins are closely abutted to each other so that their parallel wedge tips coincide along a line coaxial or parallel to the wheel drive shafts.It is the object of the invention to provide an improved bevel gear differential.The object is achieved by the construction of a built support for the differential gears according to the features of the independent claims.Thus, the object is achieved according to the invention with a pin star of a bevel gear differential for receiving differential gears, wherein the pin star has at least three cylindrical pin parts, wherein the pin parts are connected to one another in order to form the common pin star, in that each pin part has the same engagement contour in section on the end side, wherein the engagement contours of all pin parts form an assembly of the pin star from the at least three pin parts when the pin parts engage one another.Each cylindrical bolt part has an engagement contour at one of its axial ends, wherein the engagement contours of all cylindrical bolt parts are configured identically. The engagement contours engage in one another when all bolt parts are assembled, as a result of which an engagement region or a node region is defined, and form the bolt star. From this node region or engagement region, the bolt parts project radially in a geometrical understanding. The pin star can then receive and support the compensating wheels at the cylindrical, free ends of the pin parts. The engagement region or node region is so stable that no further means are required for securing the engagements of the bolt parts in one another during operation of the bevel gear differential.Since the bolt parts form a knot of the bolt star in the knot region, it is not possible or provided to provide a receptacle for further components or a component passage in the knot region, since otherwise the end-side engagement contours of the bolt parts would not engage in one another.Alternatively, it is of course conceivable to additionally secure the engagement region by means of material-locking, form-locking and / or force-locking means.Thus, the engagement region can be such that the engagements of the engagement contours are stable and fixed in the radial direction and can be released in the axial direction. However, the pin star does not then fall apart because it, or its pin parts, installed in the bevel gear differential experiences its limitation of the axial degrees of freedom by the installation in the bevel gear differential itself. These engagement contours then have engagement contact surfaces against one another only in the radial direction along the axis of the cylinder shape.The bolt parts with such a radially secure engagement contour are thus inserted into one another transversely to the longitudinal axis of its cylinder shape.A further embodiment variant provides that the engagement region can be such that the engagements of the engagement contours are stable and fixed both in the radial direction and in the axial direction. For mounting the bolt parts with this variant of the engagement contour, the bolt parts are rotated about their longitudinal axis of their cylinder shape and are threaded into one another in a rotating manner and are mutually interlocked. These engagement contours then have engagement contact surfaces against one another in the axial and radial direction.Another variant provides that the engagement region can also be such that the engagements of the engagement contours are stable and fixed both in the radial direction and in the axial direction. For mounting the bolt parts with this variant of the engagement contour, the bolt parts are tilted transversely to their longitudinal axis of their cylinder shape and threaded into one another and thus mutually interlocked. These engagement contours then have engagement contact surfaces against one another in the axial and radial direction.The solution according to the invention thus makes it possible, by means of an anchoring structure at the end side made of elements such as grooves, undercuts, recesses and / or hooks, for the bolt parts to be plugged together to form a bolt star and to be anchored one inside the other, with the result that, during operation of the bevel gear differential, said connecting node, that is to say the region in which the engagement contours are anchored one inside the other, does not become detached. It can thus be sufficient that the connecting node has a degree of freedom in which the connection of the anchoring by the engagement contours can be released again, but this degree of freedom is blocked after the installation of the pin star in the bevel gear differential-for example by the other components of the bevel gear differential, such as differential gears, output gears, spherical disks, etc.Further embodiments of the invention are described in more detail in the figures. They show with: FIG. 1a shows a bevel gear differential without housing parts according to the prior art, FIG. 1 bshows the differential carrier of the bevel gear differential according to FIG. 1 a, FIG. 2a shows a first embodiment of the engagement contour of a bolt part, FIG. 2 bshows the pin star according to the invention, which is assembled from the pin parts according to FIG. 2 a, FIG. 3a shows a second embodiment of the engagement contour of a bolt part, and FIG. 3 bshows the pin star assembled from the pin parts according to FIG. 3 ain a sectional illustration.FIG. 1 ashows a bevel gear differential 1 without housing parts according to the prior art. The bevel gear differential 1 in this illustration has two output wheels 8 which are in mesh with the three differential wheels 3. The output gears 8 and the differential gears 3 are bevel gears and give the characteristic name to the bevel gear differential 1. The differential gears 3 are mounted on a differential gear carrier 7.FIG. 1 bshows the differential carrier 7 of the bevel gear differential 1 according to FIG. 1 a. The differential carrier 7 has a central ring 9 from which three bolts 10 project radially and radially to the axis of rotation 11 of the bevel gear differential 1. The compensating wheels 3 mounted on the bolts 10 of the compensating wheel carrier 7 have their radial limit on one side on the ring 9.FIG. 2 ashows a first embodiment of the engagement contour 5 of a bolt part 4. this engagement contour 5 has a plurality of grooves which form a stepped contour in section along the longitudinal axis of the bolt part 4. The grooves extend at right angles to the longitudinal axis of the bolt part 4.FIG. 2 bshows the pin star 2 assembled from the pin parts 4 according to FIG. 2 a. Each pin part 4 has the same stepped engagement contour 5. the pin parts 4 can be guided into one another along their grooves. The stepped contour of each bolt part 4 enables anchoring along each longitudinal axis of the bolt parts 4 or in the radial direction from the axis of rotation 11. Along the axis of rotation 11, this knot 6 can be released again as long as the pin star 2 has not been installed in the bevel gear differential 1.FIG. 3 ashows a second embodiment of the engagement contour 5 of a bolt part 4. the engagement contour 5 has instead of grooves a recess, on the edge of which a hook is formed. The hook of one bolt part 4 can engage in the recess of another bolt part 4 - and vice versa. All three bolt parts 4 have the same engagement contour 5. The bolt parts 4 are assembled with one another in that the hook of one bolt part 4 engages in the recess of the adjacent bolt part 4, wherein these interventions are continued in each case in the clockwise direction, so that all three bolt parts 4 engage with one another and form the bolt star 5. In order to have the hook of one bolt part 4 hook into the recess of the adjacent bolt part 4, the one bolt part 4 must be screwed into the other bolt part 4 with a change in angle between both longitudinal axes.Alternatively, an engagement contour 5 is conceivable, according to which a rotation about the respective longitudinal axes of the bolt parts 4 the engagement can take place in one another.FIG. 3 bshows the pin star 2 assembled from the pin parts 4 according to FIG. 3 ain a sectional illustration. The viewing direction is in this illustration along the axis of rotation 11 onto the cut pin star 2.List of reference characters1 Bevel gear differential 2 pin star 3 differential gear 4 pin part 5 engagement contour 6 node 7 differential gear carrier 8 output gear 9 ring 10 pin 11 axis of rotation 12 groove 13 recess 14 hook 15 longitudinal axis

Claims

A pin star (2) of a bevel gear differential (1) for receiving differential gears (3), wherein the pin star (2) has at least three cylindrical pin parts (4), wherein the pin parts (4) are connected to one another in order to form the common pin star (2), characterized in that each pin part (4) has the same engagement contour (5) in section on the end side, wherein the engagement contours (5) of all pin parts (4) form an assembly of the pin star (2) from the at least three pin parts (4) when the pin parts (4) are engaged with one another, wherein the pin parts (4) are plugged together to form a pin star (2) and are anchored into one another, so that during operation of the bevel gear differential (1) this connection node, i.e. the region in which the engagement contours (5) are anchored into one another, does not release.The pin star (2) of a bevel gear differential (1) according to claim 1, characterized in that the assembly of the pin star (2) has a node (6) in which all engagement contours (5) of the pin parts (4) engage one another.The pin star (2) of a bevel gear differential (1) according to any one of the preceding claims, characterized in that the engagement contours (5) in engagement with one another secure the pin parts (4) of the pin star (2) only in the radial direction and permit at least one linear degree of freedom in the axial direction along the axis of rotation (11) of the bevel gear differential (1).The pin star (2) of a bevel gear differential (1) according to one of the preceding claims 1 or 2, characterized in that the engagement contours (5) in engagement with one another secure the pin parts (4) of the pin star (2) both in the radial direction and in the axial direction.Bevel gear differential (1) with a pin star (2) according to one of the preceding claims.Bolt part (4) of the bolt star (2) of the bevel gear differential (1) according to one of the preceding claims.

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