DE1478283A1 - Gear for model or toy building kits - Google Patents

Description

The invention relates to gears for model kits or building toys with components in the form of box-shaped hollow bodies with outer coupling pins, of which two neighboring pin pairs together form a square, whereby the distance between the centers of two nearby pin * fen corresponds to a module q of the kit.

The object of the invention is as a gear or toothed wheel to create components for such a kit or for building toys, through the ' or the possible uses of the kit for the production of models of machine constructions with Gear transmissions can be expanded.

To solve this problem, it is not enough to just arbitrary to design wheel or disk-shaped elements with a ring gear, which is in a corresponding sprocket of a subsequent

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bar gear engages. It must rather special measures are taken by the guarantees that any gear can bring the belonging to the kit gears with any other gear or another element engaged when these two gears or gear and another EIe.- ment are mounted on axles, which are stored in storage elements belonging to the kit, in which the spatial position of the warehouse is determined by the kit module.

The solution to the. Task requires such adjustment the gear shape that a certain relationship between the gear formation and the kit module is guaranteed.

It has been found that the necessary and sufficient prerequisites for solving this problem are contained therein consists that the radius of the gear pitch circle is a whole Is a multiple of the kit module q. The invention is therefore characterized by the feature that the radius of the Gear pitch circle is a whole multiple of the kit module q.

The specific technical effect of the invention achieved in this way consists in the fact that gears are identical or of different sizes with one another and with a number of teeth corresponding to this in one of the elements Kit of the type mentioned created model construction can be combined in any way.

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It is known to provide wheel elements for such kits with coupling pins on one wheel side surface. at the gear wheels according to the invention, it is desirable, although not necessary, to provide corresponding coupling pins.

In such a gear, the pitch circle radius of the teeth is a puncture of the number of coupling pins one on the row of pins located on one half of the gear side surface. In this embodiment, the gear wheel according to the invention is characterized by a certain relation between the pitch circle radius, the kit module and the number of coupling pins of the coupling pin row characterized (claim 2).

The effect achieved in this way is that the gear wheel side surface provided with coupling pins acts as a base plate can be used for the construction of sub-assemblies rotating with the gearwheel, which are made up of the normal elements belonging to the kit are constructed. ■

With regard to the choice of the gear module, there is a free hand. '

However, it is advantageous in practice that the gear has a tooth module t, which essentially corresponds to the kit module q.

The tooth modulus t is given by the formula

T · t = 2 ij- ^f η q

where T is the number of teeth and η is an integer, where the pitch circle radius of the previously explained

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exposure equals nq accordingly.

From this it follows under the assumption that η is the small ■ Most gear size can be selected to be equal to 1, and t equal to q, so that the number of teeth is theoretically equal to 2 ^. However, since the number of teeth must be an integer, and since the next integer over 2 J ^ 'is the number 7, this is obtained smallest gear of a series of gears according to the invention under the stated conditions the number of teeth T,. which can be a whole multiple of 7.

With an appropriate selection of the tooth module and the number of teeth, there is the advantage in practice that see a gear wheel according to the invention can also be coupled with a "rack", the teeth of which are attached to an element with the kit module q Coupling pins arranged in series are formed are.

In one embodiment of the invention, the gear teeth can be shaped so that one is perpendicular to the gear plane and tooth section tangential to the gear pitch circle forms a figure which is one of two with reference to FIG there is a median plane symmetrical halves, which lie outside the pitch circle with the part of a tooth section are identical in the gear plane. This represents a particularly advantageous embodiment of the invention Gear because it is in the following with reference to the embodiments shown in the drawing as explained in more detail, it is ensured that two each

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wells at one of two at right angles to each other Axles-mounted gears of a gear pair can be brought into engagement with one another, so that the gears also for the transmission of the movement from the one axis to the axis oriented essentially at right angles to this axis are usable.

The details ä <he invention will be hereinafter explained with reference to, for example, of embodiments in conjunction with the drawings. 1 shows a gear wheel according to the invention in side view, FIG. 2 shows the same gear wheel from the opposite one

Side seen,. *.

. Fig. 5 is a section along the line III-1II of Fig. 1, Fig. Λ a larger gear in the same side view like Fig. 1,

5 shows a part of a gear wheel according to the invention, the teeth of which are in engagement with the tooth elements of a component designed as a toothed rack or as a rack and pinion,

FIG. 6 shows, on a larger scale, a perpendicular to the gear plane and tangential to the pitch circle Section through a tooth, and FIG. 7 shows a tooth cross section along the line VII-VII

of Fig. 6. ~

"In Figures 1 to, Ψ the gear center axis is with O, while the pitch circle is denoted by D and the pitch circle

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radius are denoted by r. The in Figures 1 to J5. The gear shown has twenty-one teeth T.

That in Pig. 4 gear shown has thirty-five teeth, five of which are shown in the drawing are. On the one side visible in FIGS. 1 and 4, the gear wheel has a number of coupling pins P, which with Reference to two diameters A and B oriented at right angles to one another with the same module q as the coupling pin P on the outside of normal components (box-shaped Hollow bodies, the coupling pins of which fit into an adjacent component with a clamping effect) are arranged symmetrically, which belong to a kit to which the gear wheel according to the invention is also assigned. Such a normal component E is shown in Fig. 5 in plan view.

According to the invention, the radius r of the pitch circle D is equal to n-q, where η is an integer for the gear wheel according to the Figures 1 to 3 the number J5 and in the case of the gear according to FIG Number 5 is.

In FIG. 4, the coupling pins closest to the center of the gearwheel 0 are denoted ^{by P 1.} The centers of these pegs together form a square with side length q (module). A chord through the one side of the square, lying parallel to the gear wheel diameter AA, is denoted by CC. The number ρ of coupling pins P of a coupling pin row determined by one half of the chord CC: ■ is 2 in FIG. 1 and 4 in FIG

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from this that the coefficient η under these conditions is equal to ρ + 1, the radius r in FIG. 2 being equal to j5q and ρ is 2, while the pitch circle radius r in FIG. 4 is 5q and ρ is 4.

In the embodiment according to FIG. 5, the tooth module is t is chosen so that it approximately corresponds to the module q of the kit. This allows the gear with a number of Coupling pin P on an element belonging to the kit E are brought into engagement to form a so-called rack-and-pinion gear.

The tooth module t cannot be used with the kit module q exactly match because he is by the formula

is determined, where T must necessarily be an integer. However, if the number of teeth T (multiple of the number 7) in the smallest gear is set equal to 7, so that the tooth module t becomes equal to 0.9q, the result is a sufficiently precise approximation to the theoretical one for practical use Ideal condition.

The tooth cross-section Q shown in Figures 6 and 7 in a tangent to the pitch circle D and at right angles z.ur Gear plane lying plane VII-VII has in the manner illustrated in Fig. 7 a shape Q, which consists of two with Relation to the developed pitch circle D symmetrical half-

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th Q ¹ exists, which are identical to the part of a section through the tooth T ^f , FIG. 6, lying outside the pitch circle D in the gear center plane. The corresponding half is shown hatched in FIG.

This for the invention with characteristic design of the tooth cross-section is a prerequisite that the two gears of a gear pair can be brought into engagement with one another precisely even if the gear axles are oriented at right angles to each other.

The gears according to the invention as well as the other elements belonging to the kit are expediently manufactured by injection molding or by hot pressing of a thermoplastic material and can be provided with both primary pegs P on one side and secondary pegs S on the other side (FIGS. 2 and 5) > where the secondary pegs S are designed and arranged in the manner known in the aforementioned kits that each secondary peg S is tangent to the inside of four primary pegs P forming a square.

Under the conditions mentioned above, in which the tooth module t approximately corresponds to the kit module q, If the number of teeth T of the smallest gear, as already mentioned, is equal to 7, the next higher integer is greater than 2., while the other gears have a number of teeth T, which is a whole multiple of 7. It could, however also with an approximation that is good enough for practice

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Claims (5)

-Q- at the mentioned ideal state t = q for the smallest gear a number of teeth can be selected, which of the next whole Number less than 2? i.e. where T = β. 909808/0547 - Io - ' Claims. f 1. ) Gear for model kits or building toys with elements in the shape of box-shaped hollow bodies with outer coupling pins, of which two pairs of pins together form a square, and the distance between the centers of two neighboring pins corresponds to the kit module q, characterized in that the radius (r) of the gear pitch circle (D) is a whole multiple of the kit module (q). 2. Gear according to claim 1, characterized in that the pitch circle radius (D) by the formula r = (p + 1) q is determined, where q denotes the kit module and ρ the number of coupling pins provided on a gear wheel side surface referred to, which lie in a row, which is determined by one half of a circular tendon, the coincides with one side of a square whose corners are closest to the centers of four of the gear center and correspond with reference to this symmetrically lying coupling pin. 5. Gear according to claim 1, characterized in that that its .Zahnmodul (t) approximately the module (q) of the kit elements is equivalent to. 4 ·. Gear wheel according to claim 5, characterized in that that the number of teeth is a whole multiple of the number 7. 09808/0547 5. Gear according to claim 1, characterized in that
that its teeth are shaped so that a tooth section running at right angles to the gear wheel plane and tangential to the gear wheel pitch circle forms a figure which consists of two halves which are symmetrical with respect to a central plane and which are identical to the part of a tooth section lying outside the pitch circle in the gear wheel plane .