SU1499007A1 - Bevel gearing - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in power and kinematic bevel gears. The aim of the invention is to increase the carrying capacity and the elimination of adjustment during installation due to self-installation. In a bevel gearing containing wheels 1 and 2 with helical teeth, one of the wheels 1 is movable in the axial direction, the angle of the helix of the tooth in the middle section of the gear ring of the movable bevel wheel 1 is selected as a function of the angle of engagement and the angle of the initial cone. Near the ends of the ring gear, the ratio between the angles of the helix of the tooth, the angle of engagement, the angle of the initial cone and the coefficient of friction is observed. Gears 1, 2 can be performed each of the two gear crowns with a different direction of the spirals. 1 hp f-ly, 7 ill.

Description

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1sl

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The invention relates to mechanical engineering and can be used in power and kinematic bevel gear gears.

The purpose of the invention is to increase the carrying capacity and eliminate adjustment during installation due to self-installation, as well as expanding the functionality by reversing.

FIG. Figure 1 shows a conical gearing in axial section of a fixed wheel; in fig. 2- axial section of the transmission; in fig. 3 shows section A-A in FIG. 2; in fig. 4 - section B - B in FIG. 3; in fig. 5 shows section B-B in FIG. 3; in fig. 6 shows an embodiment of a gearing with two toothed crowns; in fig. 7 - section G - G in FIG. 6

The conical gear train contains wheels 1 and 2 with helical teeth, one of the wheels 1 is movable in the axial direction, the wheel 2 is stationary in the axial direction, the angle of the helix of the tooth in the middle section of the gear ring of the movable conical wheel 1 is selected from

arcsin (tga.-tgd), where a is the engagement angle;

6 - the angle of the initial cone of the movable wheel I, and near the ends of the gear ring of the wheel 1, the condition

.2 ± c-sol-p |, 2 / a- / 6 + c / d 6, where PI L is yr. ibi tooth helix in cross section of gears 1 and 2 gears near the ends of the crown; C - coefficient of friction.

The specified transfer execution does not provide its reversal.

To reverse the bevel gear, the gears 1 and 2 each made two gears 3, 4, 5, 6 with different directions of the spirals of the teeth.

A housing 1 1 with a tapered wheel m 2 having circular teeth is mounted in the housing 7 on bearings 8 and 9 (Fig. 2 and 6). On bearings 1 I and 12, a shaft 13 is mounted with a bevel wheel 1 having circular teeth, the shaft 13 being able to move in the axial direction. On Tslitsa 14 (Fig. 6) a crown 6 is fixed, and on the faces 15 of shaft 13 there is a crown 4, and the direction of the spiral of the teeth of the crowns 6 and 4 is opposite to the spirals of the teeth of the crowns 5 and 3.

The driver may be any of the shafts 10 or 13. However, the direction of the force, V in engagement (FIG. 3), acting on the movable conical wheel, must be towards the top of the wheel cone. When one of the shafts 10 or 13 is loaded, the torque element in engagement of the teeth of the wheels 2 and I is a circumferential tangential force T applied close to the middle of the length of the tooth. The force in the engagement is equal to the pressure distributed over a certain level, but the area in the case of circular teeth is small enough and it is quite acceptable to replace the distributed load with a concentrated force. At the point of contact, the teeth of the wheels 2 and 1 are angled at the angle p, and therefore they hook along the normal to the line., Trg

laziness acts force.,. he is a cosp

force 5 / V-smp- in the axial plane

10 plane perpendicular to the line of engagement (Fig. 4), the force L is one of the constituent forces Q (it is the force acting in the engagement)

15p L / H

cosa. cosa-cosp

where a is the angle of engagement (in non-corrected links usually). Strength in engagement R Q-sina. - 20 A / - / ga 7 - / gcx / cosp.

In the axial plane (Fig. 5) there are two forces that move the movable wheel in the axial direction: S and /. Their projections on the direction of the wheel axis

25 L S-cosf T-tg-cosd; M R-sin6

j-tga -sind

cos

The crown 3 is in equilibrium (in the axial direction) with 0 or

,, p ...

The angle of the helix zuf in the middle section (on the average module) is 35sin tga-tg

or

arcsin (tga-tgd). (1)

40 Reversible operation of the bevel gear is also provided if each wheel has two crowns with a different direction of spiral. FIG. 7. In this case, the angle p of the helix in the middle of each ring gear is subject to condition (1), and the angles of the spiral 45 near the ends of each ring gear are chosen subject to the conditions

s / np, + n-cospi /ga./ p- | bi / g6; (2)

 - tgOl.-tg - - litgf. (3)

The transmission works as follows. The gears 1 and 2 interlock, with the load transferred from the shaft 13 to the shaft 10.

The cone transfer is self-aligning and does not require adjustment to the contact patch. However, when reversed, the system of forces turns out to be reverse and equilibrium will not take place. Transmission is non-reversible. This disadvantage can be eliminated if the circular tooth is performed with an angle

spirals on the middle module. When cutting a tooth, the diameter of the incisal head is chosen such that the angles p of the helix, subject to condition (I), are sufficiently close to the average section of the conical wheel. Then, the load on the teeth during the work will always be (i.e., for any deformations of the shafts, bearings and housing) applied to the middle part of the tooth. The maximum values of the helix angles at the edges of the tooth must be greater than or the angle of the angle according to condition (3).

Claims (2)

Invention Formula I. A conical gear arrangement containing wheels with helical teeth, characterized in that, in order to increase the carrying capacity and eliminate adjustment during installation due to self-installation, one of the wheels is movable in the axial direction, the angle of the helix of the tooth in the middle section of the gear ring of the movable the conical wheel is selected from the arcstn condition (tga.-tgf), where a is the angle of engagement; 6 - the angle of the initial cone rolling wheels; and near the ends of the ring gear, the condition 0smPI 2 ± cso.р1 is met. +, where - the angles of the helix of the tooth in the cross section of the gears of the transmission near the ends of the crown; (I is the coefficient of friction. with 2. Transmission according to claim 1, characterized in that, in order to expand the functionality by reversing the transmission, the gears are each made of two gear rims with a different direction of the spirals. fpue.J Aa J3 AT fig.Z AT 6 Srig. 5 R AT 8 C) and d. 5 J3