1. Compound speed reducer, its characterized in that includes:

the case and the case cover are mutually covered;

the worm and the worm wheel are arranged in the case and are meshed with each other, a driving shaft is fixedly inserted in the center of the worm wheel, a crank which rotates synchronously with the worm wheel is fixedly sleeved on the driving shaft, and a small shaft parallel to the driving shaft is convexly arranged at the end part of the crank;

the output shaft is arranged in the case and is parallel to the driving shaft, a rocker which rotates synchronously is sleeved on the output shaft, a waist groove is formed in a rod body of the rocker, and the small shaft is arranged in the waist groove and can slide relatively;

the distance A between the central line of the small shaft and the central line of the driving shaft, the distance B between the central line of the small shaft and the central line of the output shaft when the small shaft slides in the waist groove to the maximum amplitude state, and the distance C between the central line of the driving shaft and the central line of the output shaft are in the following relationship:

A²+B²＝C²。

2. a compound speed reducer according to claim 1, wherein a is B.

3. A compound reducer as claimed in claim 1, in which the drive shaft centre line and the output shaft centre line are on the same vertical plane.

4. A compound type speed reducer according to claim 1, wherein rolling bearings are fitted to the end portions of the worm, the drive shaft, and the output shaft, and the rolling bearings are fitted to corresponding opening positions of the casing or the casing cover, and the opening positions are covered with a skeleton-sealed cover.

5. A compound reducer as set forth in claim 1 in which the worm centerline is perpendicular to the drive shaft centerline.

6. A compound speed reducer according to claim 1 in which a plain bearing is fitted over the stub shaft, the plain bearing being in direct contact with the kidney slot.

7. A compound speed reducer according to claim 1, wherein the drive shaft is provided with a key slot, and a flat key is arranged in the key slot to fixedly connect the drive shaft with the worm wheel and the crank at the same time.

8. A compound reducer according to claim 1 in which one end of the worm extends out of the housing, the end having a key slot for engaging the kinetic energy device, and the housing having threaded holes uniformly formed around the worm.

9. The compound speed reducer according to claim 1, wherein the output shaft is fixedly connected with the rocker through a flat key, and a key groove for butting the brake lever is formed in one end of the output shaft, which extends out of the chassis.

10. The compound speed reducer according to claim 1, wherein the peripheral edge of the box cover is fixedly mounted on the box by screwing, mounting platforms are formed at four corners of the box, and holes are formed in the mounting platforms.

Background

The road brake is also called a car stopper, is a passage entrance and exit management device specially used for limiting the running of motor vehicles on roads, is widely applied to a road toll station and a parking lot system management vehicle passage at present, and is used for managing the entrance and the exit of the vehicles. With the continuous development of the automobile industry and the increasing and rapid increase of the number of automobiles, the demand of the barrier gate is larger and larger, and higher requirements are put forward on the performance of the barrier gate. The performance of banister mainly depends on banister core, and at present, the banister core common adoption in the market is plane four-bar linkage transmission mode, but this kind of core has following problem:

A. when the barrier gate is in a gate closing or opening state, the self-locking function of the gate rod is difficult to realize, so that the gear of the speed reducer is impacted, and the service life is short;

B. the up-down running speed curve of the brake bar is in non-normal distribution, so that the brake bar is greatly shaken;

C. the distance between the main shaft of the machine core and the output shaft of the speed reducer is large (at least about 200mm), the rigidity is poor, and the structure is large;

D. the movement transmission piece and the speed reducer are in an open layout, so that the movement has many parts, many fault points and high cost.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a composite speed reducer.

The technical scheme adopted by the invention for solving the technical problems is as follows: a compound reduction gear comprising:

the case and the case cover are mutually covered;

the worm and the worm wheel are arranged in the case and are meshed with each other, a driving shaft is fixedly inserted in the center of the worm wheel, a crank which rotates synchronously with the worm wheel is fixedly sleeved on the driving shaft, a small shaft which is parallel to the driving shaft is arranged at the end part of the crank in a protruding mode, and a sliding bearing is arranged on the small shaft;

the output shaft is arranged in the case and is parallel to the driving shaft, a rocker which rotates synchronously is sleeved on the output shaft, a waist groove is formed in a rod body of the rocker, and the small shaft and the sliding bearing are arranged in the waist groove and can slide relatively;

the distance A between the central line of the small shaft and the central line of the driving shaft, the distance B between the central line of the small shaft and the central line of the output shaft when the small shaft slides in the waist groove to the maximum amplitude state, and the distance C between the central line of the driving shaft and the central line of the output shaft are in the following relationship:

A²+B²＝C²。

and A is B.

The central line of the driving shaft and the central line of the output shaft are positioned on the same vertical plane.

And rolling bearings are sleeved at the end part of the worm, the end part of the driving shaft and the end part of the output shaft, are embedded at corresponding opening positions of the case or the case cover, and cover the opening positions by using a framework sealing cover.

The central line of the worm is perpendicular to the central line of the driving shaft.

The small shaft is sleeved with a sliding bearing, and the sliding bearing is directly contacted with the waist groove.

The driving shaft is provided with a key groove, and a flat key is arranged in the key groove to fixedly connect the driving shaft with the worm wheel and the crank at the same time.

One end of the worm extends out of the case, a key groove for butting the kinetic energy device is formed in the end, and screw holes are uniformly formed in the case around the worm.

The output shaft is fixedly connected with the rocker through a flat key, and a key groove for butting the brake lever is formed in one end part, extending out of the case, of the output shaft.

The periphery of the box cover is fixedly installed on the case through screws, mounting table tops are formed at four corners of the case, and hole sites are formed in the mounting table tops.

Compared with the prior art, the invention has the beneficial effects that:

A. when the crank drives the rocker to swing left and right to the maximum amplitude, the included angle of positive 90 degrees is formed, the output shaft is completely self-locked, and the damage of impact force or external force to the gear of the speed reducer during the operation of the brake lever can be avoided.

B. The crank and the rocker symmetrically run on two sides of the central line of the driving shaft and the output shaft, and the speed running curves are symmetrically and normally distributed, namely the running speed of the brake lever is changed from slow to fast to slow, which is completely consistent with the performance requirement of the barrier gate, and the jitter of the brake lever in the running process can be reduced.

C. The installation distance between the driving shaft and the output shaft is shorter, and the installation distance is at least 100mm shorter than that of a common machine core, the structure is small, and the rigidity can be better.

D. The existing movement adopts a speed reducer and a four-connecting-rod transmission mechanism, transmission pieces are in an open layout, the machine adopts a composite transmission mode, namely worm and gear transmission and crank rocker transmission, and the transmission pieces are all integrated in a machine case, so that the structure is compact, parts are reduced, and the manufacturing and installation costs are greatly reduced.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced, wherein:

FIG. 1 is an outline view of a preferred embodiment of the present invention;

FIG. 2 is an exploded view of the preferred embodiment of the present invention;

fig. 3 is an internal structural view of the preferred embodiment of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for clarity of description only, and are not used to limit the scope of the invention, and the relative relationship between the terms and the terms is not changed or modified substantially without changing the technical content of the invention.

Referring to fig. 1 to 3, a composite speed reducer according to a preferred embodiment of the present invention mainly includes:

a case 1 and a case cover 2 which are mutually covered;

the worm 3 and the worm wheel 4 are arranged in the case 1 and are meshed with each other, a driving shaft 5 is fixedly inserted in the center of the worm wheel 4, a crank 6 capable of rotating synchronously with the worm wheel 4 is fixedly sleeved on the driving shaft 5, and a small shaft 601 parallel to the driving shaft 5 is convexly arranged at the end part of the crank 6;

an output shaft 7 which is arranged in the case 1 and is parallel to the driving shaft 5, a rocker 8 which rotates synchronously is sleeved on the output shaft 7, a long strip-shaped waist groove 801 is formed in a rod body of the rocker 8, and the small shaft 601 is correspondingly arranged in the waist groove 801 and can slide relatively;

the distance A between the central line of the small shaft 601 and the central line of the driving shaft 5, the distance B between the central line of the small shaft 601 and the central line of the output shaft 7 when the small shaft 601 in the waist groove 801 slides to the maximum amplitude state, and the distance C between the central line of the driving shaft 5 and the central line of the output shaft 7, wherein the three relations are as follows:

A²+B²＝C²and a ═ B.

That is, when the crank 6 drives the rocker 8 to swing left and right to the maximum amplitude, the crank 6 and the rocker 8 must keep an isosceles right angle relationship, only mutually perpendicular torques exist between the crank 6 and the rocker 8 at the moment, and no other oblique force exists, so that the rocker 8 cannot apply oblique reaction force to the crank 6, and the self-locking function of the output shaft 7 which keeps synchronization with the rocker 8 is realized.

The central line of the worm 3 is vertical to the central line of the driving shaft 5, namely the worm 3 is vertically meshed with the worm wheel 4; the distances between the central line of the driving shaft 5 and the central line of the output shaft 7 and the central line of the worm 3 are equal, and the design is optimized based on mechanical transmission.

The driving shaft 5 is provided with a key slot (not marked in the figure), and the driving shaft 5 is fixedly connected with the worm wheel 4 and the crank 6 at the same time by installing a flat key into the key slot. Similarly, the output shaft 7 and the rocker 8 are fixedly connected through a flat key.

The small shaft 601 is sleeved with a sliding bearing 602, and the sliding bearing 602 is directly contacted with the waist groove 801 to realize smooth sliding action.

The end parts of the worm 3, the driving shaft 5 and the output shaft 7 are all sleeved with rolling bearings 9, the rolling bearings 9 are embedded in corresponding opening positions of the case 1 or the case cover 2, and the framework sealing covers 10 are used for covering the opening positions to realize packaging and prevent oil leakage.

One end of the worm 3 extends out of the case 1, the end is provided with a key slot, and screw holes are uniformly formed in the case 1 around the worm 3 so as to be connected with an external motor or a driving part. Similarly, the output shaft 7 is also splined at one end extending out of the housing 1.

The case 1 is provided with an installation cavity, all the components are arranged in the installation cavity, and the peripheral edge of the case cover 2 is fixedly installed on the case 1 through screws 11. The four corners of the case 1 are formed with mounting table-boards 101, and the mounting table-boards 101 are also provided with holes, so that the machine can be fixed at a specific position.

For the convenience of understanding, the working principle of the scheme is briefly described:

during installation, the worm 3 extends out of the bottom end of the case 1 to be connected with an external motor or a driving part, one end of the output shaft 7 extending out of the case 1 is connected with a brake rod, and the brake rod and the output shaft 7 rotate synchronously. During operation, control starts outside motor or source and moves, through worm 3, worm wheel 4, driving shaft 5, crank 6, rocker 8 and output shaft 7, realizes pole, the pole that falls with power transmission to the brake lever, and the crank 6 drives the biggest rotation angle of rocker 8 and output shaft 7 and is 90 degrees, and this accords with the angle that rises and falls of brake lever, for example: the maximum amplitude of the leftward swing of the rocker 8 is set to be in a rod-up state, and the maximum amplitude of the rightward swing is set to be in a rod-down state. In addition, in the 90-degree movement process, the crank 6 and the rocker 8 symmetrically move on two sides of the central line of the driving shaft 5 and the output shaft 7, the speed operation curves are symmetrically and normally distributed, namely the operation speed of the brake lever is changed from slow to fast to slow, the performance requirement of the barrier gate is completely consistent, and particularly the jitter phenomenon in the operation of the brake lever is reduced.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any indirect modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention by those skilled in the art are within the technical scope of the present invention.