Safety clutch

Abstract

The present invention relates to the technical field of clutches, and in particular to a safety clutch, comprising a clutch shaft and a housing disposed on the clutch shaft, a clamping mechanism disposed on the clutch shaft inside the housing, a driven disc disposed on the clutch shaft inside the clamping mechanism for synchronous rotation, a driving wheel and an elastic member are respectively looped on the clutch shaft between the two sides of the driven disc and the clamping mechanism, the driven disc is slidably disposed on the clutch shaft separated from the driving wheel, and is engaged with the driving wheel under the action of the elastic member. The purpose of the present invention is to provide a clutch having a simple structure, a compact layout, and is easy to install and maintain, which can provide overload protection.

Description

Technical Field

[0001] The present invention relates to the technical field of clutches, and in particular to a safety clutch. Background Art

[0002] With the continuous development of agricultural mechanization, the number of rice transplanters has increased, and the area of ​​rice transplanting has continued to expand. The safety clutch is a key component of the rice transplanter, located between the walking box and the working box, and plays the role of transmitting power and protecting the planting arm.

[0003] The existing rice transplanter safety clutch often has the problems of complex structure, large outer dimensions, and inconvenient installation and maintenance; in addition, the tooth-type safety clutch is widely used in the market, which will generate a strong impact force at the moment of separation, easily break the teeth, have a short service life and low working reliability. Summary of the invention

[0004] In order to solve the above problems, the object of the present invention is to provide a clutch with overload protection which has a simple structure, a compact layout, and is easy to install and maintain.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A safety clutch comprises a clutch shaft and a shell arranged on the clutch shaft, a clamping mechanism is arranged on the clutch shaft inside the shell, a driven disk is arranged on the clutch shaft inside the clamping mechanism and rotates synchronously, a driving wheel and an elastic member are respectively movably mounted on the clutch shaft between the clamping mechanism and the two sides of the driven disk, the driven disk is slidably arranged on the clutch shaft separated from the driving wheel, and is engaged with the driving wheel under the action of the elastic member.

[0007] Preferably, a first ball receiving socket and a second ball receiving socket are respectively provided on opposite surfaces of the driving wheel and the driven disc, and the first ball receiving socket cooperates with the second ball receiving socket to form a chamber, in which balls are arranged.

[0008] Preferably, the depth of one of the first ball socket and the second ball socket is greater than the radius of the ball, and the width of the other one is greater than the radius of the ball.

[0009] Preferably, the balls are rotationally symmetrically distributed on the inner end surface of the driving wheel.

[0010] Preferably, the first ball bearing sockets are evenly distributed non-continuously on the radial circumference of the driving wheel, and the numbers of balls embedded in the first ball bearing sockets in each continuous section are 3, 4 and 5 respectively.

[0011] Preferably, the elastic member is a butterfly spring.

[0012] Preferably, the driven plate is connected to the clutch shaft via a spline.

[0013] Preferably, the clamping mechanism comprises a pressure block and a retaining ring for axial positioning of the driving wheel and the elastic member, the pressure block is loosely mounted on the clutch shaft and the retaining ring is clamped on the clutch shaft outside the pressure block.

[0014] Preferably, the clutch shaft is rotatably connected to the housing via a bearing.

[0015] Preferably, a bearing seat is formed in the shell, and a sealing ring for preventing oil leakage is installed in the bearing seat.

[0016] The present invention adopts the above technical solution, which has at least the following beneficial effects: by installing a clamping mechanism on the clutch shaft and sequentially installing a driving wheel, a driven disc and an elastic member on the inner side of the clamping mechanism, when the transplanting arm encounters obstacles such as stones, sticks or nails at the seedling mouth, the driving wheel for inputting torque and the driven disc for transmitting torque in the clutch are separated from each other, so that the power transmission is cut off, thereby protecting the clutch, transplanting arm and transplanting platform from damage; when the obstacle is removed, the driven disc returns to its position under the action of the elastic member and engages with the driving wheel to restore power transmission, thereby playing a role of overload protection, and the structure for realizing this process is simple, the layout is compact, and it is easy to install and maintain later. In addition, the driving wheel directly connected to the power input assembly maintains a constant axial position during operation to avoid driving the power input assembly to slip in the axial direction and affecting the transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of a safety clutch according to an embodiment of the present invention;

[0019] Figure 2 An exploded view of one side angle of the safety clutch according to an embodiment of the present invention;

[0020] Figure 3 An exploded view of the other side angle of the safety clutch according to an embodiment of the present invention;

[0021] Figure 4 It is a cross-sectional view of the safety clutch described in the embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0023] It should be noted that the terms "first" and "second" in this document are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] The “inner side” mentioned in this application refers to the side close to the center of the clutch, and the “outer side” mentioned in this application refers to the side away from the center of the clutch.

[0026] See also Figures 1 to 4 The safety clutch of the present application comprises a clutch shaft 10, a housing disposed on the clutch shaft 10, a clamping mechanism disposed on the clutch shaft 10 located inside the housing, and a driving wheel 40, a driven disc 60 and an elastic member sequentially installed inside the clamping mechanism. The driving wheel 40 and the elastic member are both loosely sleeved on the clutch shaft 10; the inner ring of the driven disc 60 is provided with an external spline, and 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 matching external spline and internal spline 11, so as to transmit the torque transmitted from the driving wheel 40 to the clutch shaft 10, and can also be slidably disposed in the corresponding keyway relative to the driving wheel 40; the elastic member provides an axial force for the driven disc 60 to return to the position and engage with the driving wheel 40. Preferably, the elastic member is a butterfly spring 70. Since the stress distribution of the butterfly spring 70 decreases evenly from the inside to the outside, it can achieve the effect of low stroke and high compensation force. When the torque exceeds the allowable value, its load bearing capacity and deformation sensitivity have outstanding advantages. In addition, the butterfly spring 70 occupies a small axial space, which meets the production requirements of miniaturization and compactness of the clutch.

[0027] In another embodiment, the driven plate 60 and the clutch shaft 10 may also be connected via a flat key, so that the structure is more simplified.

[0028] The first ball receiving socket 41 and the second ball receiving socket 61 are respectively provided on the opposite surfaces of the driving wheel 40 and the driven disc 60, and the first ball receiving socket 41 and the second ball receiving socket 61 cooperate to form a chamber for accommodating the ball 50. During normal operation, the driven disc 60 is pressed against the driving wheel 40 due to the axial thrust of the butterfly spring 70, and torque transmission is achieved through the engagement of the ball 50; when the torque exceeds the allowable value, the butterfly spring 70 is compressed by the excessive axial force, the ball 50 escapes from the first ball receiving socket 41 and pushes the driven disc 60 to slide toward the side of the butterfly spring 70, at which time, the driving wheel 40 is in an idling state; when the torque returns to normal after crossing the obstacle, the butterfly spring 70 pushes the driven disc 60 back to engage with the driving wheel 40 to continue to transmit torque. The embodiment of the present application replaces the existing tooth engagement method with the ball 50, which has the outstanding advantages of long service life, high working reliability, small sliding friction during overload, and high action sensitivity.

[0029] Preferably, the depth of one of the first ball receiving socket 41 and the second ball receiving socket 61 is greater than the radius of the ball 50, and the width of the other is greater than the radius of the ball 50. For example, the depth of the first ball receiving socket 41 exceeds the radius of the ball 50, and the ball 50 is embedded in the first ball receiving socket 41. Further preferably, the first ball receiving socket 41 is provided with a narrow opening to prevent the ball 50 from escaping. Accordingly, the depth of the second ball receiving socket 61 is less than the radius of the ball 50, and the second ball receiving socket 61 is constructed as a notch that penetrates the side of the driven disk 60. Such a design facilitates the ball 50 to quickly escape from the second ball receiving socket 61 when encountering an obstacle outside, thereby cutting off the torque transmission and playing a role of overload protection.

[0030] Preferably, the balls 50 are rotationally symmetrically distributed on the inner end surface of the driving wheel 40. Specifically, the first ball bearing sockets 41 are evenly distributed on the radial circumference of the driving wheel 40 in a non-continuous manner, and the number of balls 50 embedded in the first ball bearing sockets 41 in each continuous section is 3, 4, and 5, respectively. When a certain planting arm encounters an obstacle during the planting process, the balls 50 on the driving wheel 40 that have escaped from the driven disk 60 need to rotate at least one circle before they can re-engage with the driven disk 60, thereby ensuring the synchronous operation of each planting arm.

[0031] The clamping mechanism includes a pressure block 31 and a retaining ring 32 for axially positioning the driving wheel 40 and the elastic member, wherein the pressure block 31 is loosely mounted on the clutch shaft 10 and the retaining ring 32 is clamped on the clutch shaft 10 outside the pressure block 31. In this embodiment, the driving wheel 40 can be arranged close to the center of the clutch by selecting pressure blocks 31 on both sides with specific axial dimensions.

[0032] The housing includes a first housing 20 and a second housing 23 which are separately arranged. Bolts for fixing the first and second housings with the power input housing are provided through the angled parts of the outer edges of the first and second housings. The bolts are symmetrically distributed in three groups. The first and second housings 20 and 23 are both formed with bearing seats inside. The bearing seats are equipped with bearings 21. The clutch shaft 10 is rotatably connected with the first and second housings through the bearings 21. Preferably, a sealing ring 22 for preventing oil leakage is provided on the bottom side of the bearing seat.

[0033] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A safety clutch, comprising a clutch shaft (10) and a housing arranged on the clutch shaft (10), characterized in that: A clamping mechanism is provided on the clutch shaft (10) inside the housing, a driven disc (60) is provided on the clutch shaft (10) inside the clamping mechanism to rotate synchronously, a driving wheel (40) and an elastic member are respectively looped on the clutch shaft (10) between the two sides of the driven disc (60) and the clamping mechanism, the driven disc (60) is slidably provided on the clutch shaft (10) in a manner separated from the driving wheel (40), and is engaged with the driving wheel (40) under the action of the elastic member; A first ball bearing socket (41) and a second ball bearing socket (61) are respectively provided on opposite surfaces of the driving wheel (40) and the driven disc (60); the first ball bearing socket (41) and the second ball bearing socket (61) cooperate to form a chamber, and a ball (50) is arranged in the chamber; The first ball bearing sockets (41) are evenly distributed non-continuously on the radial circumference of the driving wheel (40), and the number of balls (50) embedded in the first ball bearing sockets (41) in each continuous section is 3, 4, and 5 respectively; The clamping mechanism comprises a pressure block (31) and a retaining ring (32) for axially positioning the driving wheel (40) and the elastic member, wherein the pressure block (31) is loosely mounted on the clutch shaft (10) and the retaining ring (32) is clamped on the clutch shaft (10) outside the pressure block (31).

2. The safety clutch according to claim 1, characterized in that: The depth of one of the first ball bearing socket (41) and the second ball bearing socket (61) is greater than the radius of the ball (50), and the width of the other is greater than the radius of the ball (50).

3. The safety clutch according to claim 1, characterized in that: The balls (50) are distributed rotationally symmetrically on the inner end surface of the driving wheel (40).

4. The safety clutch according to claim 1, characterized in that: The elastic member is a butterfly spring (70).

5. The safety clutch according to claim 1, characterized in that: The driven plate (60) is connected to the clutch shaft (10) via a spline.

6. The safety clutch according to claim 1, characterized in that: The clutch shaft (10) is rotatably connected to the housing via a bearing (21).

7. The safety clutch according to claim 6, characterized in that: A bearing seat is formed in the housing, and a sealing ring (22) is installed in the bearing seat for preventing oil leakage.

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