CN214499950U

CN214499950U - Reduction gearbox with automatic clearance compensation and buffering functions

Info

Publication number: CN214499950U
Application number: CN202022385476.5U
Authority: CN
Inventors: 卿兆波; 杨惠忠
Original assignee: Hangzhou Zhongzhigao Intelligent Technology Co ltd
Current assignee: Hangzhou Zhongzhigao Intelligent Technology Co ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-10-26
Anticipated expiration: 2030-10-23

Abstract

The utility model provides a reduction gearbox with clearance automatic compensation and buffer function, which comprises a box body containing a reduction part, wherein the reduction part is rotationally connected with the box body and comprises a screw rod, a gear assembly and an output shaft, the gear assembly and the screw rod are meshed in the box body, and the output shaft is vertically fixed at the center of the gear assembly and extends to the outside from the inside of the box body; the gear assembly comprises a helical gear, a buffer component and an output connecting piece, wherein the buffer component is clamped between the helical gear and the output connecting piece and is respectively and elastically connected with the helical gear and the output connecting piece; the width of the tooth groove of the bevel gear is gradually increased from top to bottom; and a plurality of adjusting springs are arranged on the surface vertical to the output connecting piece, one end of each adjusting spring is supported on the output connecting piece, and the other end of each adjusting spring is supported on the helical gear.

Description

Reduction gearbox with automatic clearance compensation and buffering functions

Technical Field

The utility model relates to a decelerator, especially relate to a reducing gear box with clearance automatic compensation and buffer function.

Background

The gear reduction box has wide application range and is an important part widely applied to mechanical transmission, when a pair of gears are meshed, because the inevitable existence of errors such as tooth pitch, tooth profile and the like, meshing impact can be generated in the running process to generate noise corresponding to the meshing frequency of the gears, and friction noise also occurs between tooth surfaces due to relative sliding. Since the gears are the basic parts in the transmission of the gearbox, reducing gear noise is essential to controlling gearbox noise. Most gear power input spare and output spare all adopt rigid connection structure on the market at present, and the vibrations of high frequency can take place for the gear under the drive of motor, and long-time vibrations are to damaging the gear flank of tooth, cause the phenomenon of smooth silk to the phenomenon that the speed reducer became invalid produces, and it is the problem that we need to solve to overcome long-term vibrations to the injury of gear. On the other hand, the meshing between the gears has backlash, and when the gear transmission pair needs to rotate forward and backward, a certain backlash amount is generated, which reduces the transmission accuracy. Therefore, in a device requiring precise transmission, a gear capable of eliminating backlash must be used in order to eliminate backlash.

SUMMERY OF THE UTILITY MODEL

The utility model provides a reducing gear box with clearance automatic compensation and buffer function has extensive using value.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

a reduction gearbox with automatic clearance compensation and buffering functions comprises: the gearbox comprises a box body, a speed reduction component is contained in the box body and is rotationally connected with the box body, the speed reduction component comprises a screw, a gear assembly and an output shaft, the gear assembly and the screw are meshed in the box body, and the output shaft is vertically fixed at the center of the gear assembly and extends to the outside from the inside of the box body; the gear assembly comprises a helical gear, a buffer component and an output connecting piece, wherein the buffer component is clamped between the helical gear and the output connecting piece and is respectively and elastically connected with the helical gear and the output connecting piece; the width of the tooth groove of the bevel gear is gradually increased from top to bottom; and a plurality of adjusting springs are arranged on the surface vertical to the output connecting piece, one end of each adjusting spring is supported on the output connecting piece, and the other end of each adjusting spring is supported on the helical gear.

Further, the tooth space width e satisfies:

，

wherein x is a displacement coefficient, alpha is a pressure angle, m is a modulus, delta e is a tooth space variation, and delta x is a displacement coefficient variation.

Furthermore, an output shaft mounting hole is formed in the center of the output connecting piece, an output shaft is vertically arranged on the output shaft mounting hole, the output shaft is fixed to the output connecting piece, and the molded surface on the output shaft is matched with the output shaft mounting hole.

Further, an output bearing is mounted on the output shaft and used for supporting the output shaft on the inner wall of the box body.

Furthermore, the number of the adjusting springs is at least 3, and the adjusting springs are uniformly distributed on the same circumference of the surface of the output connecting piece.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. this application adopts screw rod and helical gear combination, because gear drive's separability reduces the manufacturing degree of difficulty, and interchangeability is good. The buffering part is added in the bevel gear, so that on one hand, the impact of the device in the starting, stopping and running processes can be absorbed, and the running stability is ensured, and on the other hand, the buffering part is embedded in the bevel gear, so that the size of the integrated reduction gearbox is not increased.

2. The reverse braking function of the screw and the bevel gear can ensure that the electric driving device realizes the function of keeping the load position after power failure, and the safety and the reliability of work are ensured.

3. The tooth spaces of the bevel gears are designed into variable tooth spaces, the screw is not changed, and the transmission device carries out automatic clearance compensation after partial abrasion to form backlash-free transmission.

4. Compare among the prior art, helical gear hole and box contact, coefficient of friction is big, the helical gear hole and the output shaft direct contact of this application, the output shaft passes through the bearing to be supported on the box, and coefficient of friction is little.

Drawings

FIG. 1 is an exploded view of a reduction gearbox with automatic gap compensation and buffering functions;

FIG. 2 is a transmission diagram of the reduction gearbox with automatic gap compensation and buffering functions;

fig. 3 is a structure diagram of the helical gear of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

a reduction box with automatic clearance compensation and buffer functions comprises a box body 1, a lower box cover 12 and a front box cover 13, wherein a speed reduction part is contained in the box body 1 and is rotationally connected with the box body, the speed reduction part comprises a screw 20, a gear assembly 21 and an output shaft 22, the gear assembly and the screw are meshed in the box body, the center of the screw is fixedly connected with a screw shaft 201, the screw shaft is perpendicular to the axial direction of the gear assembly, one end of the screw shaft extends out of the box body to serve as a power input part, the screw is driven to correspondingly rotate by the rotation of the screw shaft, a drive gear rotates, and the output shaft 22 is vertically fixed at the center of the gear assembly and extends to the outside from the inside of the box body to serve as a power output part; the reduced rotation speed is output from the output shaft.

The gear assembly 21 comprises a helical gear 210, a buffer component 211 and an output connecting piece 212, wherein the buffer component is clamped between the helical gear and the output connecting piece and is respectively elastically connected with the helical gear and the output connecting piece; the width of the tooth groove of the bevel gear is gradually increased from top to bottom; and a plurality of adjusting springs 4 are arranged on the surface vertical to the output connecting piece, one ends of the adjusting springs are supported on the output connecting piece, and the other ends of the adjusting springs are supported on the helical gear.

Further, the helical gear has a groove width that gradually increases from the upper surface 2103 to the lower surface 2104, passing through the axis of the screwThe plane perpendicular to the helical gear is called the median plane, where the meshing of the screw and the dimensions corresponds to the meshing of the involute gear with the rack. When the helical gear adopts a modified gear, the width e of the tooth groove 2102 is as follows: the tooth space width e satisfies:

，

wherein x is a displacement coefficient, alpha is a pressure angle, m is a modulus, delta e is a tooth space variation, and delta x is a displacement coefficient variation. From the formula, Δ e and Δ x are linear.

The inclination of the tooth grooves of the helical gears is not simple drawing, but the gears are regarded as the superposition of gear sheets which are displaced layer by layer along the axial direction. Under the condition that the modulus, the tooth number and the pressure angle are not changed, the tooth profile of each layer of modified gear piece still keeps the characteristics of an involute tooth profile, and the involute equations of each layer are the same, so that each layer of modified gear piece can be correctly meshed with the equivalent rack of the screw on the middle plane. Assuming that the screw and the gear are in a backlash-free engagement state initially, when a clearance occurs due to wear, that is, Δ e occurs, the backlash-free engagement state can be restored as long as the gear moves by Δ x layers of the gear pieces in the axial direction.

Furthermore, the helical gear, the output connecting piece and the buffer component are tightly matched with each other, no relative motion exists after installation, the surfaces of the helical gear and the output connecting piece cannot be in direct contact, most of vibration caused by rotation of the helical gear is absorbed by the buffer component, vibration and noise can be effectively reduced, an installation through hole is formed in the center of the output connecting piece and used for fixing the output shaft on the output connecting piece, the molded surface of the output shaft is matched with the installation through hole, and the rotation of the output connecting piece drives the output shaft to synchronously rotate and is used for outputting the rotation force after speed reduction.

In the embodiment, the buffering component is arranged between the helical gear and the output connecting piece in a clamping mode, so that the helical gear cannot be in direct contact with the output connecting piece, vibration caused by the helical gear is transmitted to the buffering component firstly, and most of vibration is absorbed by the buffering component. The buffer component is damping rubber, silica gel, polyethylene or polyvinyl chloride. The cylinder of buffer member for having certain thickness, its shape and size are according to output connecting piece and helical gear phase-match, when helical gear rotates, the vibration that causes directly transmits buffer member on, the inside macromolecule chain segment of buffer member can produce relative motion, thereby can produce a counter-force that makes the vibration decay, and turn into heat energy with the mechanical energy that the vibration produced, and then can attenuate gradually when making the vibration transmit on buffer member, reach the damping purpose, on the other hand is based on buffer member's elastic buffer characteristic, can further reduce the vibration gradually. Therefore, the vibration transmitted to the output coupling member is greatly attenuated, thereby smoothing the output power.

Further, the buffer component comprises a shaft sleeve hole 2110 arranged in the center, the outer diameter of the shaft sleeve hole is consistent with the outer diameter of a shaft sleeve in the inner center of the helical gear, and a plurality of limiting through holes 2111 are arranged in the circumferential direction of the outer diameter of the shaft sleeve hole, and are through holes which are perpendicular to the surface of the buffer component and penetrate through the buffer component. Further, the helical gear comprises a hollow cylindrical fluted disc, a shaft sleeve 2105 is sleeved in the fluted disc, a plurality of clamping columns 2101 are uniformly arranged between the shaft sleeve and the fluted disc, and the clamping columns are inserted into the limiting through holes of the buffer component.

In this embodiment, the output connector includes a body 2122, a spring support post 41, and an output shaft mounting hole 2121. The main body of the output connecting piece is a circular flat sheet, preferably made of metal, an output shaft mounting hole is formed in the center of the main body and used for mounting an output shaft, the shape of the output shaft mounting hole is matched with the molded surface of the top of the output shaft, and preferably is strip-shaped. The output shaft can be clamped into the output shaft mounting hole or fixedly connected in other modes. The surface perpendicular to the output connecting piece main body is provided with a plurality of spring supporting columns 41, the spring supporting columns are uncovered cylindrical box bodies, the adjusting springs 4 are clamped and fixed in the spring supporting columns, and the other ends of the adjusting springs are in contact with the helical gears and can axially reciprocate along the helical gears. The adjusting springs are at least 3 and are evenly arranged on the same circumference of the plane of the main body, the outer diameter and the height of the spring supporting column are matched with the limiting through hole of the buffering component, after the adjusting springs are installed, the supporting column is inserted into the limiting through hole, the output connecting piece is fixed to the helical gear, and the output connecting piece, the buffering component and the helical gear form a whole and rotate synchronously. Therefore, the number of the limiting through holes of the buffering component is the sum of the number of the adjusting springs and the number of the clamping columns in the bevel gear. When the outer diameter of the spring supporting column is the same as that of the clamping column, a plurality of limiting through holes with the same aperture size are arranged on the buffering component. The outer diameter of the spring support column and the outer diameter of the clamping column are different, and the limiting through hole needs to be matched with the outer diameters of the spring support column and the clamping column respectively, so that the limiting through holes with different hole diameters need to be arranged at corresponding positions of the buffer component and are used for inserting the spring support column and the clamping column respectively.

An output bearing 3 is mounted on the output shaft for supporting the output shaft on the inner wall of the case. The inner hole of the helical gear is in direct contact with the output shaft, and the output shaft is supported on the box body through a bearing, so that the friction coefficient is small. The output bearing is preferably a rolling bearing, which reduces friction loss by changing sliding friction between the output shaft and the housing into rolling friction. The rolling bearing generally comprises four parts, namely an inner ring, an outer ring, a rolling body and a retainer, wherein the inner ring is matched with the output shaft and rotates together with the output shaft; the outer ring is matched with the box body to play a supporting role; the rolling bodies are uniformly distributed between the inner ring and the outer ring by virtue of the retainer, and the shape, size and number of the rolling bodies directly influence the service performance and service life of the rolling bearing; the retainer can enable the rolling bodies to be uniformly distributed and guide the rolling bodies to rotate to play a lubricating role. The output shaft is supported on the box body through the bearing, so that the friction force can be greatly reduced.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A reduction box with automatic clearance compensation and buffering functions is characterized by comprising:

the gearbox comprises a box body, a speed reduction component is contained in the box body and is rotationally connected with the box body, the speed reduction component comprises a screw, a gear assembly and an output shaft, the gear assembly and the screw are meshed in the box body, and the output shaft is vertically fixed at the center of the gear assembly and extends to the outside from the inside of the box body;

the gear assembly comprises a helical gear, a buffer component and an output connecting piece, wherein the buffer component is clamped between the helical gear and the output connecting piece and is respectively and elastically connected with the helical gear and the output connecting piece; the width of the tooth groove of the bevel gear is gradually increased from top to bottom; and a plurality of adjusting springs are arranged on the surface vertical to the output connecting piece, one end of each adjusting spring is supported on the output connecting piece, and the other end of each adjusting spring is supported on the helical gear.

2. The reduction gearbox with automatic clearance compensation and buffering functions as claimed in claim 1, wherein the tooth space width e satisfies the following conditions:

Δ e ═ 2 · tg α · m · Δ x, where x is the coefficient of variation, α is the pressure angle, m is the modulus, Δ e is the tooth space variation, and Δ x is the coefficient of variation.

3. The reduction gearbox with automatic clearance compensation and buffering functions as claimed in claim 1, wherein an output shaft mounting hole is formed in the center of the output connecting piece, an output shaft perpendicular to the output connecting piece is fixedly connected to the output shaft mounting hole, and a molded surface on the output shaft is matched with the output shaft mounting hole.

4. The reduction gearbox with automatic clearance compensation and buffering functions as claimed in claim 1, wherein an output bearing is mounted on the output shaft and used for supporting the output shaft on the inner wall of the box body.

5. The reduction gearbox with automatic clearance compensation and buffering functions as claimed in claim 1, wherein the number of the adjusting springs is at least 3, and the adjusting springs are uniformly distributed on the same circumference of the surface of the output connecting piece.