DE8513430U1 - Drive ring gear for crawler chains of tracked vehicles - Google Patents

Description

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Drive ring gear for crawler chains of tracked vehicles

The invention relates to a drive sprocket for crawler tracks of tracked vehicles, which on its side facing the drive motor has a recess adapted to the corresponding connection part of the drive motor with a snug fit and which is provided with several bores for the back i> carry out fastening screws, with j each bore on her den; Drive motor waived end j rait a countersink S serving as a screw head support is provided, which is designed so deep that the head of the fastening screw in question does not protrude beyond the outer contour of the drive ring gear.

The drive ring gear of the aforementioned type is inserted into the recess by means of the fastening screws Connection part of the drive motor firmly connected. The drive of the tracks of the tracked vehicle is thereby causes the teeth of the drive ring gear set in rotation by the drive motor in corresponding Engage driver openings of a chain composed of individual chain links.

A drive ring gear is produced by flame cutting, forging, casting or the like. The known Drive sprockets are given a thickness that corresponds to the required tooth thickness. That is what it means The resulting relatively high weight of the sprocket has a very disadvantageous effect when the chain is tensioned; the higher the weight of the spider, the more the chain tends to oscillate.

30th

The invention is based on the object of providing the drive ring gear of the type mentioned at the beginning without restriction the functionality and easier to perform while maintaining the wear resistance.

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Oils solution to the problem is j that the the drive motor facing away from the outer contour of the drive ring gear towards the center of the drive ring gear through Has forging or casting produced gradation. Due to the gradation, a considerable part of the material is used saved and thus the weight of the drive ring gear significantly reduced, with regard to strength and deformation maintain the same proportions.

The design of the drive ring gear according to the invention also results in several significant ones Advantages. For example, significantly lower manufacturing costs arise due to the fact that on the Drive motor facing away from the drive ring gear only a relatively small area to be machined machining is because the stepped surface can be left unmachined, and also by the fact that both the manufacture the holes and the production of the countersinks requires less machining effort. aside from that causes the additional compensation caused by the gradation

forming during forging a homogenization of the material ■ * in the tooth area and thus a better structure. The surface hardening of the tooth contour has the advantage of that the hardening time as a result of the lower, the heat dissipative connection material is shorter.

In an embodiment of the invention, the depth of the gradation is smaller than the depth of the countersink for the head of the fastening screw, so that only a minimal amount of machining is required in the manufacture of the countersink.

In a modification of the invention, the depth of the gradation can also be greater than the depth of the countersink for the head of the fastening screw so that the screw head rest is raised.

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According to a further feature of the invention, the width of the gradation extends over more than half of the 3 widths of the drive gear rim, expediently over about three quarters of the width of the drive gear rim
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The drive gear rim according to the invention can be further improved by the fact that in the area of the teeth of the drive gear rim the course of the gradation roughly corresponds to the tooth contour. follows. The saving in material and thus in weight is optimal.

The invention is explained in more detail below with reference to an embodiment shown in the drawing. Show it:
15th

1 shows a detail from a drive ring gear in a front view;

FIG. 2 shows the detail from the drive ring gear in a section along the line H-II in FIG. 1.

The drive ring gear 1 has on its side facing the drive motor (not shown) a recess 2 which is adapted to the corresponding connection part of the drive motor and has a snug fit. Furthermore, the drive gear rim 1 is provided with several bores 3 for the passage of fastening screws ¹ J, with which the drive gear rim 1 is fastened to the connecting part of the drive motor, each bore 3 being provided at its end facing away from the drive motor with a countersink 5 serving as a screw head support. The depth T of the countersink 5 is dimensioned such that the head of the fastening screw 4 does not protrude beyond the outer contour 6 of the drive gear 1. The outer contour 6 of the drive gear 1 facing away from the drive motor has a gradation 7 towards the center M, the depth t of which is only slight.

is docile smaller than the depth T of the countersink 5 for the Head of the fastening screw * J (see Fig. 2) «The width b of gradation 7 extends over more than half the width B of the Äntfiebszähnkränzes 1 (see. Fig. 1). in the In the area of the teeth 8 of the drive ring gear 1, the course 9 of the gradation 7 roughly follows the tooth contour.

In the illustrated embodiment example corresponds to Number of holes 3 the number of teeth S of the anti-friction 1G Sprocket 1 * The holes 3 are therefore useful arranged in the area of the teeth 8 »However, this is of no significance for the invention.

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Claims (1)

Protection claims: 1. Drive ring gear for crawler chains of tracked vehicles, which on its side facing the drive motor is adapted to the corresponding connection part of the drive motor Has a screw-in with a snug fit and with several bores for the passage of fastening screws is provided, each bore at its end facing away from the drive motor with an as Countersinking the screw head support is provided, which is made so deep that the head of the fastening screw in question does not extend beyond the outer contour of the Drive ring gear protrudes, characterized that the outer contour (6) of the drive ring gear (1) facing away from the drive motor to the center (M) of the drive ring gear (1) has a gradation (7) produced by forging or casting. 2. Drive ring gear according to claim 1, characterized in that the depth (t) of the gradation (7) is smaller than the depth (T) of the countersink (5) for the head of the fastening screw (4). 3. Drive ring gear according to claim 1, characterized in that the depth (t) of the gradation (7) is greater than the depth (T) of the countersink (5) for the head of the fastening screw (4). H. drive ring gear according to claim 1, 2 or 3, characterized characterized in that the width (b) of the gradation (7) extends over more than half the width (B) of the drive ring gear (1) extends. * ■:; ■ · ■ · _,,,. . i> 1 I 1 I I 5- drive gear rim according to claim U _1, characterized in that the width (b) of the step (7) extends over approximately three quarters of the width (B) of the drive gear rim (1). 10 6. Drive ring gear according to one of claims 1 to 5, characterized in that in the area of the teeth (δ) of the drive sprocket (1) the course (9) of the gradation (7) roughly follows the tooth contour. *> ι * i Mil t t ti f> i i *} III bi * ι * t * * 4 f J I I