The backlash-free gear

 

The invention relates to the field of mechanical engineering and instrument making. The gearbox includes a housing, which has consistently siteplease two pairs of bevel gears mounted on three shafts, with the possibility of joint rotation. Leading bevel gear of the first and second steps are executed with the possibility of axial movement in the direction associated driven bevel gears. The driven bevel gear rigidly mounted on the respective shafts. Leading bevel gear is spring-loaded to the slave and have an angle of inclination of the working surfaces of the teeth to the axis of rotation is not more than the angle of friction. Gear ratio of the first and second stage are equal. The driving shaft of the first stage and a driven shaft of the second stage are parallel to each other. The intermediate shaft is placed in the same plane between the master and slave shafts at an angle. The magnitude of this angle depends on the gear ratio of the gearbox and provides normal gearing paired bevel gears. The technical result is to ensure the accurate transmission of the rotational movement when changing direction of rotation and transferable is regresar and shock, increase durability and reduce noise. 1 Il.

Known technical solution, comprising a housing, which has consistently siteplease couple pair of bevel and cylindrical gears. The axis of rotation and output shafts of the first stage are located relative to each other at an angle of 90°, the axis of rotation of the shafts of the second stage are parallel (Short Polytechnical dictionary. State publishing house of Technical and theoretical literature. M., 1956.). The prototype.

However, the known technical device has significant drawbacks, namely that it does not provide the necessary accuracy of the transfer of rotational motion when the direction of rotation or transferred efforts, and relatively quickly wears out and requires a lot of money for its repair and maintenance.

50% of the total number of failures and malfunctions of machines is due to premature wear of the working surfaces of the gear wheels of the gear, the formation of gaps or clearances, the occurrence of dynamic shock that leads to the loss of technological accuracy, reduced durability and vozrasta the th sample of the gaps in the gears leads to the necessity of frequent repairs and maintenance a large number of repair workers. In our country, for this reason every 4th worker busy for repairs and is not directly involved in the creation of new goods or products. In Germany, the repair is busy every 7th and in the USA only every 10th working.

Lack of technological precision and low durability of gears known designs dramatically reduce the purchasing power on the domestic and foreign market of machines and devices that use these gears.

The technical challenge which seeks the proposed device is the design of the gearbox with automatic sample clearances, ensuring accurate transmission of rotational motion when the direction of rotation or transferred effort, high manufacturing accuracy and durability and machines, especially machines and machine tools with automatic control system.

This goal is achieved due to the fact that in the proposed device, comprising a housing, which has consistently siteplease two pairs of gear wheels, in contrast to the known gear all the driving and the driven gears have a conical shape, and a leading gear wheel of each stage is made with the possibility of the working surfaces of the teeth to the axis of rotation is not more than the angle of friction, while driving shaft of the first stage and a driven shaft of the second stage are parallel to each other, and the intermediate shaft is located in the same plane but at an angle to the axes, providing a normal toothed mating gears.

The essential distinguishing features is that the leading gear wheel of each stage is spring-loaded to the associated driven gear wheels and is made with the possibility of axial movement, and the angle of inclination of the working surfaces of the teeth of the drive wheels to the axis of rotation does not exceed the value of the friction angle (5-8°), a leading shaft of a first stage and a driven shaft of the second stage are located in one plane and parallel to each other, and the intermediate shaft is located at an angle thereto, the magnitude of which depends on the gear ratio and to ensure proper gearing paired gear wheels, gear ratio of the first and second stage are equal, leading gear wheel of the first and second stage mounted on the shafts with the possibility of joint rotation and axial movement, and the driven gears are fixed rigidly with the possibility of joint rotation with the respective shafts is it the case 1, the cover 2, a leading gear wheel of the first stage 3, mounted on the shaft 4, with the possibility of joint rotation, interaction with the associated toothed wheel 5 and the axial movement of the gear wheel 3 by means of a spring 6, the intermediate shaft 7, on which is rigidly fixed slave gear wheel 5 and the drive sprocket of the second stage 8 with the possibility of joint rotation with the driven toothed wheel of the second stage 9, rigidly mounted on the driven shaft 10 of the second stage. The toothed wheel 8 is spring-loaded to a toothed wheel 9 by means of a spring 11.

The described device operates as follows.

When turning on the motor (not shown), which shaft is coaxially connected to the drive shaft 4, gear wheel 3 and the shaft 4 make a rotational movement in a certain direction.

Gear wheel 3, which is in toothed engagement with the toothed wheel 5, transmits the rotary motion of the gear wheels 5 and 8 and the intermediate shaft 7, on which they are installed.

The drive sprocket 8 second stage transfers the rotational movement of the follower gear wheel 9 and the shaft 10.

Over time the operation of the gearbox working surfaces of the gear wheels 3, 5, 8 and 9 iznashivaemyh backlash in the gearbox.

The presence of clearances and backlash in the gear lead to a decrease in the accuracy of transmission of the rotational movement and the emergence of dynamic shock when changing direction of rotation and transmitted forces. And this, in turn, leads to lower technological precision machinery and machine tools that use these gearboxes, and rapid destruction of the teeth of gear-wheels, to the need for frequent and costly repairs. In the proposed design of the gear mechanism of the automatic sampling gaps between mating gear wheels 3 and 5, 8 and 9, and therefore to prevent the formation of gaps throughout the life of the gearbox.

It happens this way. When the gap between the working surfaces of the gear wheels 3 and 5 creates the possibility of axial movement of a leading gear wheel 3 in the direction of the driven gear 5, i.e. to the left (in the drawing) side, using a cylindrical spring 6. This preserves the accuracy of the gearing, and the inability to shift gears 3 on the right (in the drawing) side due to the fact that the angle of inclination of the working surface of the gear wheel 3 to the axis of rotation does not exceed the value of the friction angle. The path of the toothed wheel 3 on the right (in the drawing) side.

Similarly, the same sample gap is in engagement paired gear wheels 8 and 9 of the second stage.

The advantage of the proposed device is that it provides accurate transmission of rotational motion with no gaps or clearances even with frequent change of direction of rotation of the power to be transmitted during the entire period of operation at the lowest cost repair and maintenance, reduces noise, eliminates the possibility of dynamic impact, and thus increases the durability and reliability of vehicles, machines and devices, which will be used gearboxes of the proposed design.

Claims

The backlash-free gear, comprising a housing, which has consistently siteplease two pairs of gear wheels, seated on three shafts, with the possibility of joint rotation, characterized in that all the driving and the driven gears are made conical, with a leading bevel gear of the first and second stages are made with the possibility of axial movement in the direction associated driven bevel gears rigidly mounted on respective shafts, spring-loaded to them and have ia the first and second stages are equal, while driving shaft of the first stage and a driven shaft of the second stage are parallel to each other, and the intermediate shaft are placed in the same plane parallel between the master and the slave shaft at an angle, to ensure the normal gearing paired bevel gears, the magnitude of this angle depends on the gear ratio of the gearbox.



 

Same patents:

The invention relates to precise engineering, namely gears for messages rotational motion, and can be used in the actuators to reduce the output shaft speed precision machines and mechanisms

Gear // 2241878
The invention relates to the field of engineering and is intended for lowering and increasing the frequency of rotation of the working bodies of machines and mechanisms

Gear // 2241162
The invention relates to mechanical engineering and can be used in the spatial links between orthogonal intersecting axes for transmitting rotation and torque

The invention relates to mechanical engineering and can be implemented in pump engineering turn out and compressor engineering, in particular in pumps and compressors positive displacement screw type and screw pumps for pumping of multiphase mixtures

Gear planetary gear // 2233394
The invention relates to the field of engineering, namely, gear mechanical transmission, and allows to increase the load capacity of the transmission

Planetary gear // 2232320
The invention relates to planetary gear

The invention relates to toothed gerotor mechanisms and can be used in screw hydraulic motors for drilling oil and gas wells and pumps as working bodies

The invention relates to mechanical engineering, in particular to mechanical transmission, used in machines and devices

The invention relates to mechanical engineering, in particular to mechanical transmission, used in machines and devices

The invention relates to mechanical engineering, in particular to the profile of the tooth of gear for orbital gears

Planet gear // 2244181

FIELD: mechanical engineering.

SUBSTANCE: planet gear has input shaft with eccentric , race, and satellites.

EFFECT: improved design.

2 cl, 8 dwg

FIELD: mechanical engineering.

SUBSTANCE: rolling bearings of shaft (10) are housed in eccentric sleeves (3) and (4). Sleeve (3) receives bushings (5) and (13). Sleeve (4) receives bushings (6) and (14). First bushings (5) and (6) are made of eccentric and provided with conical outer surface and radial grooves. Second bushings (13) and (14) are mating with first bushings (5) and (6) over the spherical surface whose center is on the axis of shaft (10). Additional spherical surfaces are mating with the spherical surfaces of bearing washers (15) and (16) mounted on shaft (10). Bearing washers (15) and (16) are arranged in stop nuts (17) and (18) mounted in housing (2).

EFFECT: expanded functional capabilities.

5 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention can be used in drives of high-accuracy machines and mechanisms. Proposed transmission contains high-speed shaft 1 and slow-speed shaft 2, eccentric 3, stationary central wheel 9 with internal shaped profile, holder 7 with radial slots, roller intermediate links 8 placed in slots, cam 4 and additional cam 10. Cam 4 with shaped profile on outer surface is installed on eccentric 3 of high-speed shaft 1 through antifriction bearing and is in mechanical contact with roller intermediate links 8. Additional cam 10 is rigidly coupled with slow-speed shaft 2 and is turned relative to cam 4. Number of lobes of cam 4 is equal to number of lobes of additional cam 10 and differs from number of roller intermediate links 8.

EFFECT: reduced weight, axial dimensions and unbalance of transmission.

2 cl, 2 dwg

Gear mechanism // 2250340

FIELD: mechanical engineering.

SUBSTANCE: rotor axis of gear mechanism, performing a planetary movement, is displaced relatively to stator axis for distance of engagement eccentricity. As source auxiliary contour ellipse is used, while proportional coefficient k, determining radius of guiding circle, is taken equal to half necessary number of teeth z of wheel (k = z/2), optimal shape of its teeth is provided by rational combination of ellipse shape coefficient λ, equal to relation of lengths of its semi-axes and eccentricity coefficient of auxiliary contour, in form of relation of length of greater ellipse semi-axis to rolling circle radius, while inner and outer profiles are made in form of elliptic profiles from common ellipse contour.

EFFECT: simplified manufacture.

3 cl, 11 dwg

Reduction gear // 2250398

FIELD: mechanical engineering; summing-up rotary motion from several shafts.

SUBSTANCE: proposed reduction gear has housing 2 with covers 1, detachable horizontal shafts 5 and vertical shafts 10 and 11 with gears 7 and 9. Housing 2 is provided with cavities 6 for gears 7 with holes 3 and mounting seats for horizontal shafts 5 and mounting seats for vertical seats 10 and 11 in center of housing. Mounting seats for vertical upper shaft 11 and lower shaft 10 are made in centers of covers 1. Shafts 5 are located symmetrically and they are diametrically opposite relative to circle. Gears 9 of vertical shafts 10 and 11 are thrown into engagement with all gears 7 of horizontal shafts 5.

EFFECT: summing-up rotation of several quick revolving shafts into rotary motion of two shafts at low angular velocity.

2 dwg

FIELD: mechanical engineering.

SUBSTANCE: two-speed planet cycloidal reduction gear comprises housing (1), cover(2), input shaft (1), output shaft (18), corner eccentric of the first gearing, satellite pinion (5), and central pinions (4) and (7), pinion (7) being movable. All the pinions are mounted on output shaft (1) via bearings (9), (19), and (20). Satellite pinion (5) is made of a spring whose turns have a round concave profile. Central pinions (4) and (7) are made of springs the turns of which have round convex profile and which are welded to define a single structure. The number of teeth of all pinions differ from these of adjacent pinions, and from their left and right sections by the unit.

EFFECT: expanded functional capabilities.

8 cl, 3 dwg

FIELD: instrument industry.

SUBSTANCE: electric drive comprises first and second electric motors, planet gearings, and differential. Stators (5) and (6) of the electric motors are secured to housing (2) of the electric drive. Shaft (7) of rotor (3) of the first electric motor is mounted on base (1) and is connected with central pinion (16) of the differential through a clutch. Shaft (10) of rotor (4) of the second electric motor bears on shaft (7) of rotor (3) and is connected with the hollow central pinion (17) of the differential through a clutch. Central pinion (16) is mounted in the space of central pinion (17) and engages satellites (19). Satellites (19) engage satellites (21) in pair. Central pinion (16) is interposed between two spherical bearings (22) and (23). Carriers (20), (27), and (30) of the differential and first and second planet gearings are made in block with central pinions (25), (29), and (33) of the first, second, and third planet gearings, respectively. Satellites (26) and (32) engage common gearing wheel (34) which is secured to housing (2). Carrier (37) of the planet gearing is made in block with output shaft (40). First (42), second (43), and third (44) supports are interposed between central pinions (25), (29), and (33) and carriers (27), (30), and (37), respectively.

EFFECT: simplified manufacturing and assembling of the electric drive.

cl, dwg

FIELD: mechanical engineering.

SUBSTANCE: reduction gear comprises housing (1), teeth-rollers freely mounted in the recesses of the housing, driving shaft with eccentrics (9), driven flange, and satellites with teeth-rollers (15) freely mounted in the recesses. Teeth-rollers (15) engage teeth-rollers (14). The satellites transmit torque to the driven flange through pins (12). Teeth-rollers (15) of satellites and teeth-rollers (14) of housing (1) cooperate with each other through intermediate set of rollers (16).

EFFECT: enhanced efficiency.

1 cl, 3 dwg

FIELD: mechanical engineering.

SUBSTANCE: planetary-spool reducer has turning case, motionless flange, second flange, drive shaft with eccentrics disposed uniformly around it, satellites with epicycloidal teeth, roller teeth mounted freely inside internal grooves of turning case. Drive shaft has axis of rotation shifted relatively turning case. Second flange is rigidly tied with first flange by bridges crossing windows of satellites. Drive shaft is mounted in roller supports of flanges which supports are disposed eccentrically.

EFFECT: improved efficiency of reducer.

3 cl, 6 dwg

FIELD: mechanical engineering.

SUBSTANCE: planet high-power reduction gear comprises housing (1), low-speed shaft made in block with carrier (5), satellites, solar wheel (14), and floating central wheel (2) that is composed of two rims whose teeth are directed oppositely. Solar wheel (14) is secured to driving wheel (13). Housing (1) of the reduction gear is made in block with the common intermediate link provided with inner teeth for receiving the floating central wheel (2) having outer teeth (gearing compensating clutch). The outer diameter of carrier (5) is provided with two end pins for rolling bearings to engage carrier (5) with low-speed shaft through them. The carrier is provided with the central setting opening for receiving driving shaft with solar wheel (14) mounted on the rolling bearings and coaxially-radial setting single-sided openings for receiving satellite gearing compensating clutches (8) mounted on the rolling bearings. Carrier (5) from the side of driving shaft (13) has bearing radially face flange (15) which connects driving shaft (13) and axles with the satellite gearing compensating clutches (8).

EFFECT: enhanced reliability and reduced metal consumption.

3 dwg

FIELD: mechanical engineering.

SUBSTANCE: conical reduction gear comprises housing (1), shafts (4) and (5) set in rolling bearings (6) and (7), conical gear wheels (2) and (3) that engage each other, and flexible washers (8) and (9) interposed between gear wheels (2) and (3) and rotating inner races of bearings (6) and (7), respectively.

EFFECT: simplified structure.

2 dwg

Up!