CN112594299A

CN112594299A - Safety clutch

Info

Publication number: CN112594299A
Application number: CN202011564220.9A
Authority: CN
Inventors: 胡济荣; 其他发明人请求不公开姓名
Original assignee: Zhejiang Xinglaihe Agricultural Equipment Co ltd
Current assignee: Zhejiang Xinglaihe Agricultural Equipment Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-02

Abstract

The invention relates to the technical field of clutches, in particular to a safety clutch which comprises a clutch shaft and a shell arranged on the clutch shaft, wherein a pressing mechanism is arranged on the clutch shaft on the inner side of the shell, a driven disc is arranged on the clutch shaft on the inner side of the pressing mechanism in a synchronous rotating mode, a driving wheel and an elastic piece are respectively sleeved on the clutch shaft between the two sides of the driven disc and the pressing mechanism in a movable mode, the driven disc is arranged on the clutch shaft in a sliding mode relative to the driving wheel in a separated mode and is connected with the driving wheel under the action of the elastic piece. The invention aims to provide the clutch which has the advantages of simple structure, compact layout and convenient installation and maintenance and plays a role in overload protection.

Description

Safety clutch

Technical Field

The invention relates to the technical field of clutches, in particular to a safety clutch.

Background

With the continuous development of agricultural mechanization, the number of the rice transplanter is increased, and the rice transplanting area of the rice transplanter is continuously enlarged. The safety clutch is a key part of the rice transplanter, is positioned between the walking box and the working box, and plays the roles of transmitting power and protecting the planting arm.

The existing safety clutch of the rice transplanter often has the problems of complex structure, large overall size and inconvenient installation and maintenance; in addition, a jaw type safety clutch, which generates a strong impact force at the moment of separation, easily breaks teeth, has a short service life, and has low operational reliability, is widely used in the market.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a clutch with overload protection, which has a simple structure, a compact layout, and is convenient to install and maintain.

In order to achieve the purpose, the invention adopts the following technical scheme:

the safety clutch comprises a clutch shaft and a shell arranged on the clutch shaft, wherein a pressing mechanism is arranged on the clutch shaft on the inner side of the shell, a driven disc is arranged on the clutch shaft on the inner side of the pressing mechanism and synchronously rotates, a driving wheel and an elastic piece are respectively sleeved on the clutch shaft between the two sides of the driven disc and the pressing mechanism, the driven disc is arranged on the clutch shaft in a sliding mode relative to the driving wheel and is jointed with the driving wheel under the action of the elastic piece.

Preferably, the opposite surfaces of the driving wheel and the driven disc are respectively provided with a first ball socket and a second ball socket, the first ball socket and the second ball socket are matched to form a chamber, and balls are arranged in the chamber.

Preferably, one of the first ball socket and the second ball socket has a depth larger than a radius of the ball, and the other has a width larger than the radius of the ball.

Preferably, the balls are distributed on the inner side end face of the driving wheel in a rotation symmetry mode.

Preferably, the first ball sockets are discontinuously and uniformly distributed on the radial circumference of the driving wheel, and the number of the balls embedded in the first ball sockets in each continuous section is respectively 3, 4 and 5.

Preferably, the elastic member is a belleville spring.

Preferably, the driven disc is coupled to the clutch shaft by a spline.

Preferably, the pressing mechanism comprises a pressing block and a retaining ring, the pressing block and the retaining ring are used for axially positioning the driving wheel and the elastic piece, the pressing block is movably sleeved on the clutch shaft, and the retaining ring is clamped on the clutch shaft on the outer side of the pressing block.

Preferably, the clutch shaft is rotatably connected to the housing via a bearing.

Preferably, a bearing seat is formed in the housing, and a sealing ring for blocking oil leakage is arranged in the bearing seat.

By adopting the technical scheme, the invention at least has the following beneficial effects: when the rice transplanting arm encounters obstacles such as stones, sticks or nails at the rice transplanting port, the driving wheel for inputting torque and the driven disc for transmitting torque are separated from each other, so that power transmission is cut off, and the clutch, the rice transplanting arm, the rice transplanting table and the like are protected from being damaged; after the obstacle is got rid of, the driven plate returns under the effect of elastic component and the action wheel joint, resumes power transmission to play overload protection's effect, and realize the simple structure of this process, the overall arrangement is compact, be convenient for installation and later maintenance. In addition, the driving wheel directly connected with the power input assembly keeps the axial position constant in the operation process, and the influence on the transmission efficiency caused by the axial sliding of the power input assembly is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a safety clutch according to an embodiment of the present invention;

FIG. 2 is an exploded view of one side angle of a security clutch according to an embodiment of the present invention;

FIG. 3 is an exploded view of the other side angle of the security clutch according to an embodiment of the present invention;

fig. 4 is a sectional view of a security clutch according to an embodiment of the present invention.

Detailed Description

In order to make the technical features, objects and effects of the present invention more clearly understood, a detailed description of embodiments of the present invention will be given below with reference to the accompanying drawings.

It should be noted that the terms "first" and "second" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The inboard is the side that is close to the clutch center, the outside be the side of keeping away from the clutch center.

Referring to fig. 1 to 4, the safety clutch of the present application includes a clutch shaft 10, a housing disposed on the clutch shaft 10, a pressing mechanism disposed on the clutch shaft 10 inside the housing, and a driving wheel 40, a driven disc 60 and an elastic member sequentially disposed inside the pressing mechanism. The driving wheel 40 and the elastic part are movably sleeved on the clutch shaft 10; the inner ring of the driven disc 60 is provided with an external spline, the clutch shaft 10 is integrally formed with an internal spline 11, the driven disc 60 rotates synchronously with the clutch shaft 10 through the external spline and the internal spline 11 which are matched with each other, so that the torque transmitted from the driving wheel 40 is transmitted to the clutch shaft 10, and meanwhile, the driven disc can be arranged in a corresponding key groove in a sliding manner relative to the driving wheel 40; the resilient member provides an axial force to return the driven disc 60 back into engagement with the drive wheel 40. Preferably, the elastic member is a belleville spring 70, and the stress distribution of the belleville spring 70 is uniformly decreased from inside to outside, so that the effect of low stroke and high compensation force can be realized, and when the torque exceeds an allowable value, the load bearing degree and the deformation sensitivity of the elastic member have outstanding advantages; in addition, the belleville spring 70 occupies a small axial space, meeting the production requirements of miniaturization and compactness of the clutch.

In another embodiment, the driven plate 60 and the clutch shaft 10 can be coupled through a flat key, so that the structure is simplified.

The opposite surfaces of the driving wheel 40 and the driven disc 60 are respectively provided with a first ball socket 41 and a second ball socket 61, and the first ball socket 41 and the second ball socket 61 are matched to form a chamber for accommodating the balls 50. In normal operation, the driven disc 60 is pressed against the driving wheel 40 due to the axial thrust of the belleville spring 70, and torque transmission is realized through the engagement of the balls 50; when the torque exceeds the allowable value, the belleville spring 70 is compressed by the excessive axial force, the balls 50 are taken out of the first ball socket 41 and push the driven disc 60 to slide towards the belleville spring 70, and at the moment, the driving wheel 40 is in an idle running state; when the torque returns to normal when the obstacle is crossed, the belleville springs 70 push the driven plate 60 back into engagement with the driving wheel 40, continuing to transmit the torque. The embodiment of the application has the outstanding advantages of long service life, high working reliability, small sliding friction force during overload and high action sensitivity by replacing the existing jaw joint mode with the ball 50.

Preferably, one of the first ball socket 41 and the second ball socket 61 has a depth larger than a radius of the ball 50, and the other has a width larger than the radius of the ball 50. Examples are: the first ball socket 41 has a depth exceeding the radius of the ball 50, and the ball 50 is fitted into the first ball socket 41, and it is further preferable that the first ball socket 41 is provided with a converging portion for preventing the ball 50 from coming out. Accordingly, the depth of the second ball socket 61 is smaller than the radius of the ball 50, and the second ball socket 61 is configured as a notch penetrating the side of the driven plate 60, so that the ball 50 is rapidly removed from the second ball socket 61 when an obstacle is encountered on the outside, thereby cutting off the transmission of torque and performing an overload protection function.

Preferably, the balls 50 are distributed rotationally symmetrically on the inner end face of the driver 40. Specifically, the first ball sockets 41 are discontinuously and uniformly distributed on the radial circumference of the driving wheel 40, and the number of the balls 50 embedded in the first ball sockets 41 in each continuous section is 3, 4 and 5 respectively. When an obstacle is encountered during the insertion process of a certain insertion arm, the balls 50 on the driving wheel 40, which are disengaged from the driven disc 60, need to rotate at least one circle to be re-engaged with the driven disc 60, so that the synchronous operation of the insertion arms is ensured.

The pressing mechanism comprises a pressing block 31 and a retaining ring 32, the pressing block 31 is used for axially positioning the driving wheel 40 and the elastic piece, the pressing block 31 is movably sleeved on the clutch shaft 10, and the retaining ring 32 is clamped on the clutch shaft 10 on the outer side of the pressing block 31. The present embodiment can make the driving wheel 40 be disposed near the center of the clutch by selecting the pressing blocks 31 on both sides of a specific axial dimension.

The casing contains first casing 20 and the second casing 23 that the separation set up, and the outer fringe contained angle position of first, second casing runs through the setting and is used for the bolt fixed with the power input casing, the bolt is three groups of symmetric distribution. Bearing seats are formed in the first shell 20 and the second shell 23, bearings 21 are installed in the bearing seats, and the clutch shaft 10 is rotatably connected with the first shell and the second shell through the bearings 21. Preferably, a sealing ring 22 for blocking oil leakage is arranged at the bottom side of the bearing seat.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. Safety clutch, including clutch shaft (10) and set up the casing on clutch shaft (10), its characterized in that, set up hold-down mechanism on the clutch shaft (10) of casing inboard, synchronous pivoted setting driven plate (60) on clutch shaft (10) of hold-down mechanism inboard, the movable sleeve has action wheel (40) and elastic component respectively on clutch shaft (10) between driven plate (60) both sides and hold-down mechanism, slip that driven plate (60) separated relative action wheel (40) is located on clutch shaft (10), and with action wheel (40) joint under the effect of elastic component.

2. The safety clutch according to claim 1, wherein the driving pulley (40) and the driven pulley (60) have a first ball socket (41) and a second ball socket (61) formed on opposite surfaces thereof, respectively, and the first ball socket (41) and the second ball socket (61) cooperate to form a chamber in which the balls (50) are disposed.

3. The safety clutch according to claim 2, characterized in that one of the first ball socket (41) and the second ball socket (61) has a depth greater than a radius of the balls (50) and the other has a width greater than the radius of the balls (50).

4. Safety clutch according to claim 2, characterized in that the balls (50) are distributed rotationally symmetrically to the inner end face of the driver (40).

5. Safety clutch according to claim 4, characterized in that the first ball socket (41) is not continuous and evenly distributed on the radial circumference of the driving wheel (40), and the number of balls (50) embedded in the first ball socket (41) in each continuous section is 3, 4 and 5 respectively.

6. Safety clutch according to claim 1, characterized in that the elastic element is a belleville spring (70).

7. Safety clutch according to claim 1, characterized in that the driven disc (60) is coupled with the clutch shaft (10) by means of splines.

8. The safety clutch according to claim 1, characterized in that the pressing mechanism comprises a pressing block (31) and a retaining ring (32) for axially positioning the driving wheel (40) and the elastic member, the pressing block (31) is movably sleeved on the clutch shaft (10) and the retaining ring (32) is clamped on the clutch shaft (10) outside the pressing block (31).

9. Safety clutch according to claim 1, characterized in that the clutch shaft (10) is rotationally connected with the housing by means of a bearing (21).

10. Safety clutch according to claim 9, characterized in that a bearing seat is formed in the housing, in which a sealing ring (22) for blocking oil leakage is arranged.