Coupling for motor test

Abstract

The utility model provides a coupler for testing a motor, which is characterized by comprising a coupler main body with an inner cavity and an opening at the lower end of the inner cavity, a square shaft positioned at the upper end of the coupler main body, and a main force shaft of which the end part is inserted into the inner cavity, wherein the main force shaft is sleeved with a ratchet wheel, the ratchet wheel is connected with the lower end face of the coupler body through a connecting structure, and the coupler body and the ratchet wheel are fixed through the connecting structure to drive the main force shaft to move synchronously; the end, located in the inner cavity, of the main force shaft is provided with a gear. The coupling main body is connected with the main force shaft through the connecting structure, and the coupling main body is provided with the inner cavity for placing the gear of the main force shaft, so that the gear cannot be damaged during testing.

Description

Technical Field

[0001] The utility model relates to a coupling for motor testing. Background Art

[0002] When testing motor performance parameters, a coupling is required to connect the motor to the test equipment. One end of the coupling connects to the motor output shaft, and the other end connects to the test equipment output shaft. The end that connects to the test equipment output shaft is typically a square shaft, while the end that connects to the motor output shaft can be of various types.

[0003] In the existing technology, the clamping coupling is put on the motor gear, the side screws are locked, and the gear is clamped. Its disadvantages are:

[0004] (1) If the locking force is too small, the coupling and gear may slip when the motor rotates at high speed.

[0005] (2) If the locking force is too large, the coupling will damage the gears. Utility Model Content

[0006] The purpose of this utility model is to address the above-mentioned problems in the existing technology and propose a coupling for motor testing, in which the coupling body is connected to the main shaft through a connecting structure, and the coupling body is provided with an inner cavity for placing the gear of the main shaft, so that the gear will not be damaged during testing.

[0007] The purpose of the utility model can be achieved by the following technical solutions: A coupling for motor testing, characterized in that it includes a coupling body having an inner cavity and an opening at the lower end of the inner cavity, a square shaft located at the upper end of the coupling body, and a main shaft with an end inserted into the inner cavity, wherein:

[0008] The main shaft is sleeved with a ratchet, and the ratchet is connected to the lower end surface of the coupling body through a connecting structure, and the coupling body and the ratchet are fixed through the connecting structure to drive the main shaft to move synchronously;

[0009] The end of the main shaft located in the inner cavity is provided with a gear.

[0010] Furthermore, the square shaft and the coupling body are integrally formed.

[0011] Furthermore, the ratchet is formed by powder metallurgy or machining, and its material is steel, copper or alloy.

[0012] Furthermore, there is a certain distance between the gear and the inner cavity wall, the inner diameter of the inner cavity is larger than the outer diameter of the gear, and there is a certain distance between the end of the main shaft and the inner top surface of the inner cavity.

[0013] Furthermore, the connecting structure is a positioning pin, the lower end surface of the coupling body is provided with a plurality of first positioning holes, the ratchet is provided with second positioning holes corresponding to the first positioning holes, one end of the positioning pin is inserted into the first positioning hole for fixation, and the other end of the positioning pin is inserted into the second positioning hole.

[0014] Furthermore, the diameter of the positioning pin is larger than the inner diameter of the first positioning hole, and the positioning pin and the first positioning hole are interference fit.

[0015] Furthermore, the outermost end of the first positioning hole is located above the middle of the positioning pin.

[0016] Furthermore, chamfers are provided at both ends of the second positioning hole, the outer end of the positioning pin extends out of the second positioning hole and the extended portion is slightly larger than the thickness of the ratchet, and the diameter of the second positioning hole is slightly larger than the positioning pin.

[0017] Furthermore, the inner wall of the second positioning hole and the outer surface of the positioning pin both have rough surfaces, and the outer end of the positioning pin is chamfered.

[0018] Furthermore, the inner wall roughness of the second positioning hole is ≤Ra1.6, and the outer surface roughness of the positioning pin is ≤Ra0.8.

[0019] Compared with the prior art, the advantages of the present application are: the coupling body and the main shaft are connected by a connecting structure, and the coupling body is provided with an inner cavity for placing the gears of the main shaft, so the gears will not be damaged during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the utility model;

[0021] Figure 2 It is a schematic diagram of the coupling body;

[0022] Figure 3 This is a schematic diagram of the coupling body from another perspective;

[0023] Figure 4 It is a schematic diagram of the main axis;

[0024] Figure 5 It is a cross-sectional view of the utility model;

[0025] Figure 6 It is a cross-sectional view of the coupling body and ratchet wheel in the separated position;

[0026] In the figure, 1, square shaft; 2, coupling body; 21, inner cavity; 22, first positioning hole; 3, positioning pin; 4, main shaft; 41, gear; 42, ratchet; 421, second positioning hole. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention.

[0028] like Figure 1-6 As shown, a coupling for motor testing is characterized in that it includes a coupling body 2 having an inner cavity 21 with an opening at the lower end of the inner cavity 21, a square shaft 1 located at the upper end of the coupling body 2, and a main shaft 4 with an end inserted into the inner cavity 21, wherein:

[0029] The main shaft 4 is sleeved with a ratchet 42 and the ratchet 42 is connected to the lower end surface of the coupling body 2 through a connecting structure. The coupling body 2 and the ratchet 42 are fixed through the connecting structure to drive the main shaft 4 to move synchronously.

[0030] The end of the main shaft 4 located in the inner cavity 21 has a gear 41 .

[0031] The square shaft 1 is used to connect with the output shaft of the test equipment so as to be driven to rotate by the test equipment. It is fixed with the ratchet 42 through a coupling instead of using the gear 41, thereby avoiding damage to the gear 41.

[0032] Furthermore, the square shaft 1 and the coupling body 2 are integrally formed.

[0033] Furthermore, the ratchet 42 is formed by powder metallurgy or machining, and its material is steel, copper or alloy.

[0034] like Figure 5 As shown, further, there is a certain distance between the gear 41 and the wall of the inner cavity 21, the inner diameter of the inner cavity 21 is larger than the outer diameter of the gear 41, and there is a certain distance between the end of the main shaft 4 and the inner top surface of the inner cavity 21. The gear 41 is placed in contact and damaged.

[0035] Furthermore, the connecting structure is a positioning pin 3, and a plurality of first positioning holes 22 are provided on the lower end surface of the coupling body 2. A second positioning hole 421 corresponding to the first positioning hole 22 is provided on the ratchet 42. One end of the positioning pin 3 is inserted into the first positioning hole 22 for fixation, and the other end of the positioning pin 3 is inserted into the second positioning hole 421.

[0036] Furthermore, the diameter of the positioning pin 3 is larger than the inner diameter of the first positioning hole 22, and the positioning pin 3 is interference-fitted with the first positioning hole 22. This arrangement ensures the connection strength between the two.

[0037] Furthermore, the outermost end of the first positioning hole 22 is located above the middle of the positioning pin 3. The depth of the positioning pin 3 in the first positioning hole 22 is ensured so that the positioning pin 3 is not easy to fall out.

[0038] like Figure 6 As shown, further, both ends of the second positioning hole 421 are chamfered (as shown in FIG. Figure 6 (As shown at B in the figure), the outer end of the positioning pin 3 extends out of the second positioning hole 421, and the extended portion is slightly larger than the thickness of the ratchet 42. The diameter of the second positioning hole 421 is slightly larger than the positioning pin 3. The chamfered ends of the second positioning hole 421 facilitate the insertion of the positioning pin 3 and cooperate with the chamfered corners of the positioning pin 3 described below.

[0039] Furthermore, the inner wall of the second positioning hole 421 and the outer surface of the positioning pin 3 both have a roughness, the inner wall roughness of the second positioning hole 421 is ≤ Ra1.6, the outer surface roughness of the positioning pin 3 is ≤ Ra0.8, and the outer end of the positioning pin 3 is rounded (such as Figure 6 The rounded corners facilitate insertion of the positioning pin 3 into the second positioning hole 421 , and the second positioning hole 421 and the positioning pin 3 are ground to a lower roughness, thereby enhancing the stability of the connection.

[0040] Principle: first, the locating pin 3 is connected and fixed with the first locating hole 22 of the coupling body 2 by interference fit, then aligned with the second locating hole 421 on the ratchet 42, and then inserted into the second locating hole 421. The lower end face of the coupling body 2 fits with the surface of the ratchet 42. At this time, the inner cavity 21 of the coupling body 2 covers the gear 41 and the end of the main shaft 4, and a gap is left to avoid damage to the gear 41 and other components during the test. The locating pin 3 is inserted in the first locating hole 22 and the second locating hole 421, and will not slip even if the speed increases, thereby ensuring the reliability of the test.

[0041] The technical solution of the above-mentioned utility model provides a solution that is significantly different from the existing technology to address the technical problem that the existing technology solution is too single. The parts not involved in the technical solution of this application are the same as the existing technology or can be implemented by using the existing technology, and will not be repeated here.

[0042] The technical solutions in the above embodiments have clearly and completely described the contents of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

Claims

1. A coupling for motor testing, characterized in that: It includes a coupling body with an inner cavity and an opening at the lower end of the inner cavity, a square shaft located at the upper end of the coupling body, and a main shaft with an end inserted into the inner cavity, wherein: The main shaft is sleeved with a ratchet, and the ratchet is connected to the lower end surface of the coupling body by a connecting structure, and the coupling body and the ratchet are fixed by the connecting structure to drive the main shaft to move synchronously; the connecting structure is a positioning pin, the lower end surface of the coupling body is provided with a plurality of first positioning holes, and the ratchet is provided with second positioning holes corresponding to the first positioning holes, one end of the positioning pin is inserted into the first positioning hole for fixation, and the other end of the positioning pin is inserted into the second positioning hole; The end of the main shaft located in the inner cavity is provided with a gear; There is a certain distance between the gear and the inner cavity wall, the inner diameter of the inner cavity is larger than the outer diameter of the gear, and there is a certain distance between the end of the main shaft and the inner top surface of the inner cavity.

2. A motor testing coupling according to claim 1, characterized in that: The square shaft and the coupling body are formed as one piece.

3. The motor testing coupling according to claim 1, characterized in that: The ratchet is formed by powder metallurgy or machining, and its material is steel, copper or alloy.

4. The motor testing coupling according to claim 1, characterized in that: The diameter of the positioning pin is larger than the inner diameter of the first positioning hole, and the positioning pin is interference fit with the first positioning hole.

5. The motor testing coupling according to claim 4, characterized in that: The outermost end of the first positioning hole is located above the middle of the positioning pin.

6. The motor testing coupling according to claim 5, characterized in that: Both ends of the second positioning hole are chamfered, the outer end of the positioning pin extends out of the second positioning hole and the extended portion is slightly larger than the thickness of the ratchet, and the diameter of the second positioning hole is slightly larger than the positioning pin.

7. The motor testing coupling according to claim 6, characterized in that: The inner wall of the second positioning hole and the outer surface of the positioning pin both have rough surfaces, and the outer end of the positioning pin is chamfered.

8. The motor testing coupling according to claim 7, characterized in that: The inner wall roughness of the second positioning hole is ≤Ra1.6, and the outer surface roughness of the positioning pin is ≤Ra0.8.

Images