Elastic spacer bush coupling

Abstract

The utility model designs an elastic spacer bush coupling which can be disconnected when breaking through an elastic limit. The elastic spacer bush coupling comprises two connecting shaft sleeves which are arranged in a mirroring manner, and a flexible sleeve is arranged between the two connecting shaft sleeves; the connecting shaft sleeve comprises a first part and a second part, the first part is used for connecting an external connecting rod and is a hollow cylinder, a rectangular groove is formed in the inner cylindrical surface, and a threaded hole is formed in the center of the rectangular groove and penetrates through the first part in the radial direction; the second part is a wafer, the first end and the first part are integrally formed, the second end axially extends to form rectangular teeth, and the rectangular teeth are rotationally and symmetrically arranged along the end face of the second part; and in a virtual circular ring where the rectangular teeth are located, the outer circumferential diameter is the same as that of the second part, and the inner circumferential diameter is larger than that of the second part.

Description

Technical Field

[0001] The utility model relates to the field of couplings, and particularly relates to an elastic spacer coupling. Background Art

[0002] At the output shaft of a motor, a coupling is installed to connect two transmission shafts with concentric axes. Only through the coupling can the output shaft of the motor drive the driven shaft to move. The use of an elastic coupling has the functions of compensating for the relative offset of the two shafts, shock absorption, wear resistance, and buffering.

[0003] Chinese Patent Publication No. CN 219712098 U, publication date September 19, 2023, the name of the invention-creation is a plum blossom-shaped elastic coupling, which discloses a plum blossom-shaped elastic coupling, belonging to the technical field of couplings. It includes a first convex tooth, and a plum blossom-shaped shock pad is provided on the right side surface of the first convex tooth. The inner wall of the first convex tooth is in contact with the outer surface of the plum blossom-shaped shock pad. A second convex tooth is provided on the right side of the plum blossom-shaped shock pad, and the inner wall of the second convex tooth is in contact with the outer surface of the plum blossom-shaped shock pad. The left side surface of the first convex tooth is fixedly connected with a first connecting pipe. By using polyurethane rubber and polytetrafluoroethylene to make the plum blossom-shaped shock pad, the plum blossom-shaped shock pad has strong wear resistance, tear resistance, aging resistance, and elasticity, so that it can avoid the plum blossom-shaped shock pad from being broken due to heat accumulation in the case of low speed, high torque, and frequent alternation, thus avoiding accidents. The plum blossom-shaped shock pad made of polyurethane rubber and polytetrafluoroethylene has a long service life and can reduce the consumption of the plum blossom-shaped shock pad.

[0004] It can be seen from its specification and specification drawings that the other two coupling ends respectively correspond to two types of convex teeth, and these two types of convex teeth overlap in a certain circumferential surface range, and the two types of convex teeth alternate, and elastic units are filled in the alternating gaps. This means that when the elastic unit is completely compressed, the torque or force will be directly transmitted by the contact between the convex teeth.

[0005] However, for the situation where the force-receiving end is completely stuck, if the motor end is still connected to the force-receiving end through the above-mentioned coupling, it will inevitably cause the stopping force to be reversely transmitted to the servo motor, resulting in motor damage. Therefore, it is necessary to design an elastic coupling that will disconnect the coupling connection when the elastic limit is exceeded. Summary of the Invention

[0006] The utility model designs an elastic spacer coupling that will disconnect the coupling connection when the elastic limit is exceeded, including: two coupling sleeves arranged mirror-symmetrically, and a flexible sleeve is arranged between the two coupling sleeves.

[0007] The coupling sleeve includes: a first part and a second part; the first part is used to connect an external connecting rod, and is a hollow cylinder with a rectangular groove provided on its inner cylindrical surface, a threaded hole is provided at the center of the rectangular groove, and the threaded hole penetrates the first part in the radial direction;

[0008] The second part is a disc, wherein the first end is integrally formed with the first part, and the second end axially extends rectangular teeth, and the rectangular teeth are arranged rotationally symmetrically along the end face of the second part;

[0009] The virtual circular ring where the rectangular teeth are located, wherein the outer diameter of the outer circumference is the same as the outer diameter of the second part, and the inner diameter of the inner circumference is greater than the inner diameter of the second part;

[0010] The diameter of the flexible sleeve is greater than the outer diameter of the second part, and a toothed through hole is provided along the end face of the flexible sleeve, wherein the shape of the teeth is the same as that of the rectangular teeth on the second part; the thickness of the flexible sleeve is greater than 2 times the thickness of the rectangular teeth and less than 2.5 times the thickness of the rectangular teeth.

[0011] An axial gap is provided on the flexible sleeve, and the gap communicates the outer peripheral surface and the inner peripheral surface of the flexible sleeve, and the gap is rectangular.

[0012] Preferably, the number of the rectangular teeth is 10;

[0013] The difference between the outer peripheral radius and the inner peripheral radius of the flexible sleeve is greater than 1.5 times the length of the rectangular teeth.

[0014] Taking 10 rectangular teeth as an example, 10 rectangular holes will be provided on the inner ring of the flexible sleeve to correspondingly accommodate these rectangular teeth one by one. Let the coupling sleeve connecting the power end shaft be the input coupling sleeve, and the coupling sleeve connecting the force receiving end shaft be the output coupling sleeve.

[0015] When the elastic spacer coupling operates normally, the rectangular teeth of the input coupling sleeve transmit force to the flexible sleeve, and the flexible sleeve transmits force to the rectangular teeth of the output coupling sleeve.

[0016] When the output end is stuck for various reasons, the force receiving shaft will cause the output coupling sleeve to be unable to rotate. At this time, since the input coupling sleeve continues to rotate under the influence of the input shaft, and the flexible sleeve will expand radially as the angles at both ends are different, so that the rectangular holes are disengaged from the rectangular teeth. When the force receiving shaft resumes, the flexible sleeve can reset with the flexibility of the material itself, thereby restoring the function of the coupling itself.

[0017] The gap is connected to the toothed through hole;

[0018] The width of the gap is 1 / 3 of the toothed through hole, and the midpoint of the short side of the gap overlaps with the midpoint of the short side of the toothed through hole.

[0019] Moreover, the elastic spacer coupling of the present application has no more other structures axially, which is convenient for quick plugging and unplugging applications, and at the same time has the advantage of convenient replacement of the flexible sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall assembly structure diagram of the utility model;

[0021] Figure 2 The matching diagram of the deflexion sleeve and the shaft sleeve of the utility model;

[0022] Figure 3 The flexible cover map of the utility model;

[0023] In the figure: 1. Coupling sleeve, 2. Flexible sleeve, 100. Rectangular teeth. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings. Example

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, the elastic spacer coupling comprises: two coupling sleeves 1 arranged in mirror image, and a flexible sleeve 2 is arranged between the two coupling sleeves;

[0026] The coupling sleeve includes: a first part and a second part; the first part is used to connect the external connecting rod, is a hollow cylinder, has a rectangular groove on the inner cylindrical surface, has a threaded hole in the center of the rectangular groove, and the threaded hole passes through the first part in the longitudinal direction;

[0027] The second part is in the form of a disc, wherein the first end is integrally formed with the first part, and a rectangular tooth 100 extends axially from the second end, and the rectangular tooth is rotationally symmetrically arranged along the end surface of the second part;

[0028] A virtual circular ring where the rectangular teeth are located, wherein the outer diameter is the same as the outer diameter of the second portion, and the inner diameter is greater than the inner diameter of the second portion;

[0029] The diameter of the flexible sleeve is larger than the outer diameter of the second part, and a tooth-shaped through hole is opened along the end surface of the flexible sleeve, wherein the shape of the tooth is the same as the rectangular tooth on the second part; the thickness of the flexible sleeve is 2.2 times the thickness of the rectangular tooth. In this way, when the coupling sleeves on both sides are inserted at the same time, there will still be some axial spacing, which is conducive to the disengagement and reset of the flexible sleeve.

[0030] An axial gap is provided on the flexible sleeve, the gap connects the outer peripheral surface and the inner peripheral surface of the flexible sleeve, and the gap is rectangular. The gap is connected to the tooth-shaped through hole;

[0031] The width of the slit is 1 / 3 of the tooth-shaped through hole, and the midpoint of the short side of the slit overlaps with the midpoint of the short side of the tooth-shaped through hole.

[0032] The number of the described rectangular teeth is 10; the difference between the outer peripheral radius and the inner peripheral radius of the flexible sleeve is equal to 1.5 times the length of the long side of the rectangular tooth. An overly short difference will cause the structure of the flexible sleeve to become fragile after disengagement, resulting in a short expected lifespan, while an overly long difference may cause the flexible sleeve to be unable to disengage, thus losing the original intention of the design of this coupling.

[0033] Taking the case where the number of rectangular teeth is 10, the flexible sleeve filled between adjacent rectangular teeth will form a sector, and the angle of the sector is 36°.

[0034] Taking 10 rectangular teeth as an example, 10 rectangular holes will be opened on the inner ring of the flexible sleeve to correspondingly accommodate these rectangular teeth one by one. Let the coupling sleeve connecting the power end shaft be the input coupling sleeve, and the coupling sleeve connecting the force receiving end shaft be the output coupling sleeve.

[0035] When the elastic spacer coupling operates normally, the rectangular teeth of the input coupling sleeve transmit force to the flexible sleeve, and the flexible sleeve transmits the force to the rectangular teeth of the output coupling sleeve.

[0036] When the output end is jammed for various reasons, the force receiving shaft will cause the output coupling sleeve to be unable to rotate. At this time, since the input coupling sleeve continues to rotate under the influence of the input shaft, and the flexible sleeve will expand radially as the angles at both ends are different, causing the rectangular holes to disengage from the rectangular teeth. When the force receiving shaft resumes, the flexible sleeve can reset with the flexibility of the material itself, thus restoring the function of the coupling itself.

[0037] Moreover, the elastic spacer coupling of this application has no more other structures axially, which is convenient for quick plugging and unplugging applications, and at the same time has the advantage of being convenient to replace the flexible sleeve.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Elastic sleeve coupling, characterized in that, Comprising: Two shaft coupling sleeves with mirror image settings, and a flexible sleeve is arranged between the two shaft coupling sleeves; Wherein the shaft coupling sleeve includes: a first part and a second part; the first part is used to connect an external connecting rod, and is a hollow cylinder, with a rectangular groove opened on the inner cylindrical surface, and a threaded hole is arranged at the center of the rectangular groove, and the threaded hole radially penetrates the first part; the second part is a disc, wherein the first end is integrally formed with the first part, and the second end axially extends rectangular teeth, and the rectangular teeth are rotationally symmetrically arranged along the end face of the second part; The virtual ring where the rectangular teeth are located, wherein the outer diameter of the outer circumference is the same as the outer diameter of the second part, and the inner diameter of the inner circumference is greater than the inner diameter of the second part by the same amount; The diameter of the flexible sleeve is greater than the outer diameter of the second part, and a toothed through hole is opened along the end face of the flexible sleeve, wherein the shape of the teeth is the same as that of the rectangular teeth on the second part; the thickness of the flexible sleeve is greater than 2 times the thickness of the rectangular teeth and less than 2.5 times the thickness of the rectangular teeth; An axial gap is arranged on the flexible sleeve, and the gap communicates with the outer peripheral surface and the inner peripheral surface of the flexible sleeve, and the gap is rectangular.

2. The elastic spacer coupling according to claim 1, characterized in that, The number of the rectangular teeth is 10; The difference between the outer peripheral radius and the inner peripheral radius of the flexible sleeve is greater than 1.5 times the length of the rectangular teeth.

3. The elastic spacer coupling according to claim 1, characterized in that, The said gap is connected to the toothed through hole; The width of the gap is 1 / 3 of the toothed through hole, and the midpoint of the short side of the gap overlaps with the midpoint of the short side of the toothed through hole.

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