CN212106709U

CN212106709U - Transmission shaft overload protection buffer mechanism

Info

Publication number: CN212106709U
Application number: CN202020925216.XU
Authority: CN
Inventors: 朱威威; 刘薇薇; 虞军
Original assignee: Yancheng Weishi Machinery Co ltd
Current assignee: Yancheng Weishi Machinery Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-12-08
Anticipated expiration: 2030-05-28

Abstract

The utility model discloses a transmission shaft overload protection buffer gear, including lower cover tile, stopper, outer spring hoop, interior spring hoop, be provided with clutch assembly between lower cover tile and the input shaft connecting seat, the lower cover tile is provided with the transmission protrudingly, the dog, and the stopper is the annular, and the outside symmetry is provided with little flange, big flange, installs the output dabber in the centre bore of stopper, output dabber center is provided with the splined hole, with power take off, the stopper inboard is provided with the keyway, installs T type end cap in the keyway, and the pole portion of end cap inserts in the epaxial counter sink of spindle, and interior spring hoop, outer spring hoop are installed by interior outside in proper order to the outer lane of stopper and big flange, and outer spring hoop top both sides are provided with the crimp of symmetry, and the shell extrudees the elbow inwards, and two crimps little flange, transmission protruding card together. The utility model discloses make the clutch module cushion earlier, the back separation and reunion has avoided the impact force to the damage of transmission shaft assembly, has prolonged each spare part life, avoids frequent change.

Description

Transmission shaft overload protection buffer mechanism

Technical Field

The utility model belongs to transmission shaft protection device field, concretely relates to transmission shaft overload protection buffer gear.

Background

The transmission shaft overload protector can be used for preventing the engine from slipping when the engine is overloaded, and protecting parts such as the engine. The chinese utility model patent CN209510948U granted by this company is a wear-resistant overload protector, CN209354555U is an adjustable transmission shaft overload clutch, discloses a novel overload protection device different from the traditional shear pin type and friction type two modes, and has longer service life and more stable performance. However, in the subsequent use process, the situation that the overload is slowly generated because the rotating load is only depended on to exceed the overload threshold value for disengagement is found, but when the instantaneous super-large impact load is encountered, the overload protection device does not have enough time to release the protection function, and parts such as an engine and the like are damaged; meanwhile, parts such as marbles, wheel casing grid retaining grooves and the like can be greatly damaged, and can be abraded and damaged after long-term use, and the protective performance can be reduced or loses efficacy.

SUMMERY OF THE UTILITY MODEL

The above-mentioned not enough to prior art exists, the to-be-solved technical problem of the utility model is that current transmission shaft overload protection buffer gear receives instantaneous especially big impact load, and too late release protect function causes unable protection effect to play to and cause the damage to overload protection spare part.

In order to solve the problem, the utility model provides a transmission shaft overload protection buffer gear possesses buffer function, enables the machine and meets when especially big impact force or resistance at the operation in-process, obtains certain buffering before the protector work, provides reaction time for the protector, avoids damaging machine part.

In order to solve the technical problem, the utility model discloses a following technical scheme: a transmission shaft overload protection buffer mechanism comprises a lower cover tile, a limiting block, an outer spring hoop and an inner spring hoop,

a clutch component is arranged between the lower cover tile and the input shaft connecting seat, the clutch component can be disengaged when the load exceeds the set load, the rated load of the clutch component is adjusted through a disc spring, a cylindrical shell is arranged on the outer sides of the lower cover tile and the clutch component,

the rear side of the lower cover tile is provided with a limiting block, the lower cover tile is annular, and the inner side of the outermost ring is provided with a transmission protrusion and a stop block which are vertical to the lower surface of the lower cover tile;

the limiting block is annular, a small flange and a large flange are symmetrically arranged on the outer side of the limiting block, an output mandrel is arranged in a central hole of the limiting block, a spline hole is arranged in the center of the output mandrel and used for outputting power, a key groove is arranged on the inner side of the limiting block, a T-shaped plug is arranged in the key groove, the rod part of the plug is inserted into a counter bore on the mandrel,

the limiting block and the outer ring of the large flange are sequentially provided with an inner spring hoop and an outer spring hoop from inside to outside, two sides of the top of the outer spring hoop are provided with symmetrical bent edges, the shell extrudes the bent head inwards, and the small flange and the transmission protrusion are clamped together by the two bent edges.

Further, the thickness of the transmission protrusion is equal to that of the limiting block.

Furthermore, the transmission protrusion, the stop block and the lower cover tile are integrally processed.

Furthermore, the two stop dogs are symmetrically arranged at the center of the lower cover tile and on two sides of the large flange, the included angle between the large flange and the stop dogs is smaller than that between the small flange and the stop dogs, the outer sides of the small flange and the large flange are cylindrical surfaces, and the small flange, the large flange and the annular part of the limiting block are in transition through fillets.

Further, in order to ensure smooth relative rotation between the limiting block and the lower cover tile, grooves are respectively formed in contact surfaces of the limiting block and the lower cover tile, and a plurality of balls are filled in the grooves.

Furthermore, the device also comprises a bearing bush, wherein the lower cover bush, the limiting block, the output mandrel and the input shaft connecting seat are transversely connected through the bearing bush.

The utility model has the advantages that:

1. the transmission shaft overload protection buffer mechanism of the utility model is arranged between the clutch component and the output mandrel, when the clutch component is overloaded instantly, the limiting block and the lower bearing bush rotate relatively temporarily, thus avoiding the damage of impact force to the engine, the transmission shaft, the spline and the clutch on the transmission shaft assembly;

2. after the utility model buffers larger impact force, if the actual load exceeds the rated load, the load can still be separated, and the transmission assembly is protected;

3. the utility model discloses prolong the life of transmission shaft assembly, avoided frequent change.

Drawings

Fig. 1 is a schematic view of a half-section assembly of a transmission shaft overload protection device and a buffer mechanism according to the present invention;

fig. 2 is a schematic top view of the transmission shaft overload protection buffer mechanism of the present invention.

In the figure: 1. an input shaft connecting seat; 2. a disc spring; 3. a lower cover tile; 301. a stopper; 302. a drive projection; 4. an output spindle; 5. a housing; 6. a limiting block; 601. a small flange; 602. a large flange; 7. a ball bearing; 8. a clutch assembly; 9. a plug; 10. an outer spring band; 11. an inner spring hoop.

Detailed Description

The following detailed description of the present invention will be made in conjunction with the accompanying drawings and specific embodiments.

As shown in fig. 2, a transmission shaft overload protection buffer mechanism comprises a lower cover tile 3, a limit block 6, an outer spring hoop 10 and an inner spring hoop 11,

as shown in fig. 1, a clutch assembly 8 is arranged between the lower cover tile 3 and the input shaft connecting seat 1, the clutch assembly 8 can be disengaged when the load exceeds the set load, the rated load of the clutch assembly 8 is adjusted through a disc spring 2, a cylindrical shell 5 is arranged on the outer sides of the lower cover tile 3 and the clutch assembly 8,

as shown in fig. 2, a limiting block 6 is arranged at the rear side of the lower cover tile 3, the lower cover tile 3 is annular, a transmission protrusion 302 and a stop block 301 are arranged at the inner side of the outermost ring, and the transmission protrusion 302 and the stop block 301 are perpendicular to the lower surface of the lower cover tile 3;

the limiting block 6 is annular, a small flange 601 and a large flange 602 are symmetrically arranged on the outer side of the limiting block 6, an output mandrel 4 is arranged in a central hole of the limiting block 6, a spline hole is arranged in the center of the output mandrel 4 for outputting power, a key groove is arranged on the inner side of the limiting block 6, a T-shaped plug 9 is arranged in the key groove, the rod part of the plug 9 is inserted into a counter bore on the mandrel,

the inner spring hoop 11 and the outer spring hoop 10 are sequentially arranged on the outer rings of the limiting block 6 and the large flange 602 from inside to outside, symmetrical bent edges are arranged on two sides of the top of the outer spring hoop 10, the shell 5 extrudes the bent head inwards, and the small flange 601 and the transmission protrusion 302 are clamped together by the two bent edges.

In practical application, the thickness of the transmission protrusion 302 is equal to that of the limiting block 6.

In practical application, the driving protrusion 302, the stopper 301 and the lower cover tile 3 are integrally formed.

In practical application, the two stop blocks 301 are symmetrically arranged at the center of the lower cover tile 3 and at two sides of the large flange 602, an included angle between the large flange 602 and the stop block 301 is smaller than an included angle between the small flange 601 and the stop block 301, the outer sides of the small flange 601 and the large flange 602 are cylindrical surfaces, and the small flange 601, the large flange 602 and the annular part of the limiting block 6 are in fillet transition.

In practical application, in order to ensure the smoothness of the relative rotation between the limiting block 6 and the lower cover tile 3, grooves are respectively arranged on the contact surfaces of the limiting block 6 and the lower cover tile 3, and a plurality of balls 7 are filled in the grooves.

In practical application, the device also comprises a bearing bush, wherein the lower cover bush 3, the limiting block 6, the output mandrel 4 and the input shaft connecting seat 1 are transversely connected through the bearing bush.

The utility model discloses a theory of operation:

when overload occurs, an instantaneous impact force is usually generated and then gradually falls back to be stable. The transmission shaft protection device is essentially a clutch, and a large impact force instantaneously generated when the load exceeds the limit causes certain damage to the engine, the transmission shaft, the spline and the clutch, even directly breaks. The utility model discloses set up the buffering between clutch and output shaft, when great impact force produced, can will be earlier with the extrusion of inner spring hoop 11, outer spring hoop 10, take place relative rotation between lower bearing bush and the stopper 6, the protruding 302 of transmission is thrown off with little flange 601, and stopper 6 links firmly with output dabber 4, and the lower bearing bush can't conduct the instantaneous impact force for output dabber 4 this moment to avoid the damage to the transmission shaft assembly.

Then the impact torque is converted into the extrusion elasticity of the inner spring hoop 11 and the outer spring hoop 10 and gradually becomes stable, the large flange 602 of the limiting block 6 is continuously contacted with the stop block 301 of the lower bearing bush to continue transmission, and at the moment, when the actual load exceeds the set rated threshold, the clutch is disengaged and slips to protect parts of the transmission shaft assembly. The utility model discloses a buffering protection process can conclude to "buffer earlier, later skid".

The clutch component can be in a shearing pin type, a friction type, a cylindrical cam socket joint type or a ball type, and the mechanism can be conveniently installed.

To sum up, the utility model discloses make the clutch module cushion earlier, the damage of engine, transmission shaft, spline, clutch on the transmission shaft assembly has been avoided the impact force to the back separation and reunion, has prolonged the life of transmission shaft assembly, avoids frequent change.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the present invention is to provide a person skilled in the art with the ability to understand the contents of the present invention and implement the same, and not to limit the scope of the present invention.

Claims

1. The utility model provides a transmission shaft overload protection buffer gear which characterized in that: comprises a lower cover tile (3), a limiting block (6), an outer spring hoop (10) and an inner spring hoop (11),

a clutch component (8) is arranged between the lower cover tile (3) and the input shaft connecting seat (1), the clutch component (8) can be disengaged when the load exceeds the set load, the rated load of the clutch component (8) is adjusted through a disc spring (2), a cylindrical shell (5) is arranged on the outer sides of the lower cover tile (3) and the clutch component (8),

a limiting block (6) is arranged on the rear side of the lower cover tile (3), the lower cover tile (3) is annular, a transmission protrusion (302) and a stop block (301) are arranged on the inner side of the outermost ring, and the transmission protrusion (302) and the stop block (301) are perpendicular to the lower surface of the lower cover tile (3);

the limiting block (6) is annular, a small flange (601) and a large flange (602) are symmetrically arranged on the outer side of the limiting block (6), an output mandrel (4) is arranged in a central hole of the limiting block (6), a spline hole is arranged at the center of the output mandrel (4) to output power, a key groove is arranged on the inner side of the limiting block (6), a T-shaped plug (9) is arranged in the key groove, the rod part of the plug (9) is inserted into a counter bore on the mandrel,

the limiting block (6) and the outer ring of the large flange (602) are sequentially provided with an inner spring hoop (11) and an outer spring hoop (10) from inside to outside, symmetrical bent edges are arranged on two sides of the top of the outer spring hoop (10), the shell (5) extrudes the bent head inwards, and the small flange (601) and the transmission protrusion (302) are clamped together by the two bent edges.

2. The overload protection buffer mechanism for the transmission shaft according to claim 1, wherein: the thicknesses of the transmission protrusion (302) and the limiting block (6) are equal.

3. The overload protection buffer mechanism for the transmission shaft according to claim 1, wherein: the transmission protrusion (302), the stop block (301) and the lower cover tile (3) are integrally processed.

4. The overload protection buffer mechanism for the transmission shaft according to claim 1, wherein: the two stop blocks (301) are symmetrically arranged at the center of the lower cover tile (3) and on two sides of the large flange (602), the included angle between the large flange (602) and the stop block (301) is smaller than that between the small flange (601) and the stop block (301), the outer sides of the small flange (601) and the large flange (602) are cylindrical surfaces, and the small flange (601), the large flange (602) and the annular part of the limiting block (6) are in circular bead transition.

5. The overload protection buffer mechanism for the transmission shaft according to claim 4, wherein: the limiting block (6) and the contact surface of the lower cover tile (3) are respectively provided with a groove, and the grooves are filled with a plurality of balls (7).

6. The overload protection buffering mechanism for transmission shaft according to claim 4 or 5, wherein: the bearing bush type lower cover bush structure is characterized by further comprising a bearing bush, wherein the lower cover bush (3), the limiting block (6), the output mandrel (4) and the input shaft connecting seat (1) are kept in transverse connection in a bearing bush type.