SU1227862A1 - Gearing - Google Patents

Description

This invention relates to a memory card and can be used in adjustable gears.

The purpose of the invention — expanding the range and number of stages of adjustment with a constant number of teeth — is achieved by automatically moving the set teeth in the curvilinear grooves of the gear wheels.

FIG. 1 shows a gearing diagram; in fig. 2 - sweep conical wheels superimposed on each other; in fig. 3 - gear gear, general view; in fig. 4 is a section A-A in FIG. 3; FIG. 5 is a section BB in FIG. 3; FIG. 6 is a view B of FIG. five.

In the housing 1 there is a conical wheel 2, the typesetting oblique teeth 3 of which are placed in grooves shaped in cross section. Wheel 2 is matched with a helical helical conical wheel 4 with equally-wide depressions (longitudinal tooth profile is tangential or circular). The oblique teeth 3 have a slope, corresponding to the angle of inclination of the teeth of the wheel 4.

The four molded teeth of wheel 2 are in contact with the three teeth of wheel 4 at points a, & & u (Fig. 1), and at points ai this contact is made with one tooth. This situation increases the number of teeth on wheel 4 by one.

The sweep of the bevel wheel 4 relative to the center 0 is limited by the external cone distance Rg, internal R; with an average conical distance R (see Fig.2).

A portion of the engagement zone of the sweep with the center Oj of the second conical wheel 3 with the dial teeth is superimposed on the first scan and in the reverse movement it is wrapped around the corner speed and, H2 from the center 0

The scan shows how two adjacent dental teeth a and, with a certain arrangement, contact one tooth of wheel 4 with center 0 {at the larger end limited by the radius Rg, and after one - at the smaller tootz R ;.

FIG. 3 shows a gear consisting of a housing 1, on which in bearings there is a conical helical gear 2 with splined teeth 3 having

-

0

five

0

the ability to move in curly grooves. The longitudinal profile of the grooves is an arc of a circle or a straight lire, and the transverse profile (see Fig. 4) is designed in the form of a lock. With wheel 2, a conical wheel 4 is coupled, which has an equally wide depression with a longitudinal profile — circular or tangential, depending on the chosen profile of wheel 2.

Rods 5 are connected to the spline teeth 3, which end with hooks 6 entering the guide groove on the cam 7 freely mounted on the shaft of the wheel 2.

The longitudinal profile of the groove corresponds to the law of movement of the teeth 3 along the conical forming wheel 2.

A cam-shaped gear 8 is fixed on the cam 7 and is coupled to a bevel wheel 9. The bevel wheel 9, together with the lever 10, is freely seated on the axle 11. On the arm 10, spring-loaded pawls 12 are mounted, which with their free ends interact with the stops 13 stuck on the bevel wheel 9 The lever 10 with its spherical head interacts with a cam 14 mounted on the transmission housing 1 (see also section BB in Fig. 5). A support 15 is mounted on the shaft of the bevel wheel 2, which secures the cam 7 from axial movement. A support 16 is fixed on the support 15, which is provided with two notches for the dogs 12. On the cam 14, a switch 17 is located at the branching point. The switch 17 has three positions: the middle and two extreme (see figure 6), and is held in the middle position spring 18.

Initially, the composing teeth are installed in the middle of the bevel wheel 2 and are in contact at mid-points with the wheel 4. In this case, the end steps P of both wheels coincide and the gear ratio is next

  Z

1 7 2

where Z, and Z, are the number of teeth on the first and second wheel.

 When the splined teeth are placed through one step towards the larger end of the first wheel, two splined teeth are brought into contact with one.

the tooth of the first bevel wheel; This situation corresponds to a 2-fold increase in the teeth of the first wheel. There are also intermediate positions of the variation in the rate at which only a part of the teeth are shifted from the centerline in accordance with the formula

where n is the number of added teeth on the first conical wheel. The magnitude of the displacement of the DC (see Fig.2)

is determined from the triangle abs by

Sine Theorem

yk

sin (/,)

where jb and A are the average tilt angles

tooth lines of both wheels.

When arranging the spline teeth, a ledge to the smaller end of the first wheel ensures the spline teeth contact through one tooth of the first bevel wheel, which corresponds to a 2-fold reduction of the teeth on it. As in the first case, there is an intermediate position when the part of the teeth is shifted to the smaller end of the first bevel wheel, and the variation of the gear ratio corresponds to the formula

one

Zi

 n

where n is the number of teeth reduced on the first conic wheel.

The conical gear works as follows.

When the composing teeth 3 are placed in the middle of the bevel wheel 2, the steps p on the indicated wheel and wheel 4 are the same, and the gear is from Z, wearing the number of teeth i

2

In this case, the switch 17 is in the middle position, and the lever 10, together with the wheel 2, rotates in the middle part of the copier 14. To change the gear ratio, for example to the side of its increase, switch 17 is moved to the left position, while the lever 10 enters the left copier bypass channel 14 cm. Fig.6 and

j

ten

20

5 Q

five

0

five

0 5

moves relative to wheel 2 at a certain angle. The lever 10 using the left dog 12 and the stop 13 turns the bevel wheel 9 and the bevel gear 8 associated with it with the cam 7 also at a certain angle relative to the bevel wheel 2, and the rods 5, interacting with the hooks 6 with the groove on the cam 7, displace part of the teeth 3 to a new position relative to the middle of the wheel 2. During this cycle of right speed control, the pawl 12, interacting with the casing 16, is turned off, and the switch 17, under the action of the spring 18, takes its original middle position.

Since, in the new position of the splined teeth 3, their end spacing will be 2 times less than the end spacing of the teeth on the wheel 4, two spacing teeth 3 are in contact with one tooth of the wheel 4, and the gear ratio becomes i Z (

Zj - n

- the number of pairs of teeth 3,

wheel 4 in contact with one tooth. The second and subsequent stages of adjustment (depending on the number of composing teeth 3) are performed by repeating the indicated upper cycle, i.e. switch 17 is set back to the left position, etc.

In order to return the teeth to the initial position, the switch 17 is moved to the right position. In this case, the lever 10 moves to the right bypass channel of the copier 14, carries the right dog 12 behind itself, and the left dog 12, running over the casing 16, is turned off. The right of the dog 12, interacting with the right stop 13, turns the cam 7 relative to the wheel 2 with the help of bevel wheels 8 and 9 and returns the tooth 3 to the middle position with the help of the groove on the cam 7 and the shaft 5.

Repeat the cycle further, you can transfer the corresponding teeth 3 to the larger end of the bevel wheel 2. The gear ratio is reduced, since in this case, the end spacing of the spline teeth 3 becomes 2 times larger than the end spacing of the teeth of the wheel 4, and the spacing of the spline teeth is provided through one tooth of the wheel 4. The ratio formula for Z

becomes i.

Z ,, + n

Of

l

Phys .2

6-6

AA (f o & epf ymo) a

Phi. (noSff / f // 77O)

/ 7

YU

/ 3

FIG. five

u & .S

Compiled by A.Matveev Editor A.Dolinich Tehred V.KadarKorrektor V.Shshtska

 - - - --- - -. - -. -.-.-..--- - "". "- .-,".

Order 2276/37 Circulation 880 Subscription

BNIIPI USSR State Committee.

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

A gear transmission, comprising a housing, two shafts, wheels mounted on them, the first of which is made with a conical helical gear. with equal wide cavities, the second has grooves, curly in cross section, in which the set teeth are placed with the possibility of moving along them, and a control element connected with them, including thrusts, cams, bevel wheels, a lever, a copier and doggies with springs, distinguishing with that, in order to expand the range and number of control steps with a constant number of teeth, the shafts are parallel to each other, the second wheel is also conical, the grooves are curved in the longitudinal section, the type-setting teeth are placed in the grooves along the of the first bevel wheel at distances on both sides of its middle, equal to _ _Р »cos_ / J <_____ ^ΔΚ 'sin (р, - ~ β ~) ~' where ЛЯ is the distance between the teeth; P - end step in the middle of the bevel wheel; Λ ’/ ^ ζ ~ tilt angles of the teeth of the bevel wheels; the rods are made in the form of rods with hooks at one end and connected to the other ends with set teeth, the cam is conical with a groove on the conical surface in which the hooks are located, one of the conical wheels of the control is rigidly connected to the cam, the other interacts with the lever, and the latter interacts with a copier. ^ Ua „1227862 A1