CS274108B1 - Chain driving turas - Google Patents

Abstract

The invention solves an optimum engagement of a chain drive caterpillar wheel with a belt chain with maximum service life. The basic diameter (D) of a toothing (11) pitch circle of the chain drive caterpillar wheel (1) is enlarged to a pitch circle diameter (D1) by a value corresponding to at most one third of an allowed enlargement (Δt) of a pitch (t) of a link of the belt chain (2) caused by its wearing during operation, which is given by the following formula:D1 <= D + [Δt / 3 x sin(180 degrees/Z)], of which D = t / sin(180 degrees/Z)where Z is the number of teeth of the toothing of the drive chain caterpillar wheel, and where the distance (U) of the shift of the centres of the diameters (R) of the bottom of the teeth of the tooth clearance is the same or longer than difference of prolongation of the circumference on the half of the embraced part of the enlarged diameter (D1) of the toothing (11) pitch circle of the chain drive caterpillar wheel (1) with regard to the basic diameter (D) of the pitch circle, which is given by the following formula:U >= (D1 - D) x (π / 2)<IMAGE>

Description

(57) (Optimized engagement of the chain drive chain with the chain chain for maximum lifetime. Base diameter (D) pitch circle (11) Chain drive turau (1) Increased to pitch circle diameter (D) by a value corresponding to one third of the allowable increase (At) of the pitch (t) of the chain link (2) due to its wear during operation, given by:

^D 1 · ° * κπ: «5 ° · z

of which D sin where Z is the number of teeth of the chain drive gear, whereby the distance (U) of the displacement of the centers of the radii (R) of the teeth tooth gap is equal to or greater than the difference in circumferential extension at half ) the pitch circle of the toothing (11) of the chain drive turbine (1) with respect to the basic diameter (0) of the pitch circle, given by:

U - (D _x - 0) is

274 108 (II) ^B1 (51) Int. Cl.

B62D 55/30

1-u-δΙ

FIG

CS 274108 Bl

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a chain drive train for driving a tracked chassis of a tractor type, e.g.

In the prior art chain drive turbines, the pitch diameter of the toothing as well as the pitch of its toothing are determined and manufactured according to the theoretical calculation of the pitch of the chain links.

The disadvantage of the chain drive bogie so determined and executed is that due to the manufacturing tolerances of the chain drive bog gears and the manufacturing chain belt tolerances, and due to wear of the chain drive bog gears and the belt chain during operation, the actual belt chain link pitch is more The timing on the circumference of the belt drive chain section mainly transmits only the first tooth of the chain drive chain section, resulting in excessive wear of the chain drive chain teeth and parts of the chain and at the same time to increase the driving resistance.

The above drawbacks eliminate the chain drive train according to the invention, to drive a tracked chassis of the tractor type, who engage the teeth of the chain drive train in the chain links of the chain drive part of the chain drive train. a value corresponding to a maximum of one-third of the permissible swelling of the chain links of the belt chain due to its wear during operation, given by:

At

3, sin

of which D

The distance of displacement of the centers of the tooth bottom gap radiuses is equal to or greater than the difference in circumferential extension of the half of the circumferential portion of the increased pitch circle diameter of the chain drive gear tooth relative to the pitch pitch base diameter.

U = (D-1-D)

The advantages of the chain drive train according to the invention are that the pulling force from the sprockets of the chain drive train is distributed over the belt chain bushings over the longitudinally wrapped part of the chain drive train. Thus, the tension from the chain drive boss is transmitted both by friction friction from the wrap around the circumference of the heel circle from belt tension, and by engagement of the last filament tooth from the wrap around the circumference of the chain drive base. parts of the belt / which significantly reduce their wear, thereby increasing their service life. In addition, optimum engagement of the chain drive chain with the chain chain is achieved for the maximum service life. A further advantage is that in this way the toothing of the chain drive boss can be used with a greater manufacturing tolerance (which allows the use of the chain drive boss with the cast gearing clean, without machining).

In the drawing, in an exemplary embodiment, the object of the invention is schematically illustrated. In FIG. 1, the chain drive train is engaged with the chain chain link housings of the new belt chain and the new chain drive train. 1 and shows an increase in the diameter of the pitch circle of the toothed drive chain and the displacement of the centers of the tooth bottom gap radii.

The basic diameter D of the pitch circle of the chain drive gear 11, which is given by the relation D o —1 —-- sin 180 ⁰ Z

CS 274108 B1 where t is the chain pitch, Z is the number of teeth of the chain drive gear,

It is enlarged to the diameter of the pitch circle, · which corresponds to a maximum of one-third of the magnification A t of the pitch t of the links of the chain of the belt due to its wear during operation, which is given by:

Χ _χ SD +

At

3, sin ™ z

Thus, the tooth pitch of the new chain drive chain gear tooth 11 is greater than the pitch of the chain link member 2. This distance is equal to or greater than the difference in circumferential extension at half of the circumferential portion of the enlarged diameter of the pitch circle of the tooth drive chain 1 relative to the base diameter Q of the pitch circle. is given by:

U 5 (D, -D). x 2

When the chain drive train 1 is rotated in the direction of rotation according to FIG. with a frictional friction from the wrap around the circumference of the wrapping of the chute 1.

By gradual wear in the provocation, the tooth pitch 11 of the chain drive drive is achieved! 1 is the same as the spacing t of the chain link 2, so that the tension on the chain 2 is transmitted from the toothing 11 of the chain drive chain 1 to all chain bushings 3 on the belt part of the chain 2 to which the tension the teeth 11 are evenly distributed.

This achieves minimal wear of the interlocking parts, minimal engagement losses, which results in a substantial increase in the life of both the chain 2 of the belt and the toothing 11 of the chain drive tail 1.

The chain drive train according to the invention can advantageously be used on all tracked undercarriages of the tractor type of construction and earth moving machines.

Claims (1)

OBJECT OF THE INVENTION Chain drive Turas, 'to propel tracked vehicle tractor type where the tooth chain drive Turas engage in chain links of the belt on the contacted portion of the chain driving it Turas ¹ characterized in that the base diameter (D) of the pitch circle of the teeth (11) of the chain drive The boss (1) is increased to the diameter (D ^ of the pitch circle by a value corresponding to a maximum of one third of the permissible increase (At) of the pitch (t) of the chain link (2) due to its wear during operation. At 3.sin 180 of which D sin 180 who Z is the number of teeth of the chain drive gear teeth, the distance (U) displaced CS 274108 B1 tooth center gap radius center (R) is equal to or greater than the circumferential elongation difference in the half-wrapped portion of the enlarged diameter (D ^) of the pitch circle (11) of the chain drive gear (1) relative to the base diameter (D) pitch circles, which is given by: U = (D, -D). - ™ ^A 2