Dynamometer motor assembly

Abstract

The utility model provides a dynamometer motor assembly, the dynamometer motor assembly comprises a motor, an expansion connecting sleeve and a rotating speed torque detection piece, a rotor is arranged in the motor, one end of the rotor extends out of a motor shell to serve as a motor output shaft, the motor output shaft is provided with the expansion connecting sleeve, and the rotating speed torque detection piece is arranged on the expansion connecting sleeve. The expansion connecting sleeve comprises an outer locking movable ring and an inner expansion ring sleeve, a plurality of first bolt holes are evenly formed in the outer locking movable ring, the diameter of a first cavity in the outer locking movable ring is gradually increased from the side of the motor shell to the side of the outer locking movable ring, the formed taper angle is 2-4 degrees, the inner expansion ring sleeve comprises a deformation ring and a connecting flange, and the deformation ring is connected with the connecting flange. The expansion connecting sleeve provided by the utility model does not affect the dynamic balance of the output shaft of the motor during power measurement transmission.

Description

Technical Field

[0001] The utility model relates to the technical field of motor output connectors, and particularly relates to a dynamometer motor assembly. Background Art

[0002] The motor output shaft is generally composed of the part of the motor rotor protruding from the motor housing, and is of a cylindrical structure. The spline is used to connect the motor output shaft. The spline consists of multiple key teeth and key grooves on the shaft and the mating part, and is divided into internal and external splines. The side of the key teeth is the working surface, and the torque is transmitted by the extrusion of the side of the key teeth. The spline connection has a high load-bearing capacity, high centering accuracy, good guiding performance, and can achieve static or dynamic connection. However, at the same time, the spline connection method also has deficiencies. The key groove of the spline weakens the strength of the shaft, and stress concentration may cause wear and broken teeth, which will reduce the service life. In addition, the processing accuracy requirements of the spline are relatively high, the manufacturing process is complex, and the manufacturing cost is relatively high. Moreover, the output power of the dynamometer motor is large (400KW) and the speed is high (20000rpm). If the spline connection is used, the spline will change the geometric symmetry of the motor output shaft. After connecting with the speed-torque sensor, it is necessary to perform dynamic balance detection on the whole connection, otherwise it cannot meet the working requirements of the dynamometer motor. Summary of the Invention

[0003] In view of this, the utility model aims to propose a dynamometer motor assembly to solve the above problems.

[0004] The utility model provides a dynamometer motor assembly, which includes a motor, a shrink disc coupling and a speed-torque detector. A rotor is arranged in the motor, and one end of the rotor extends out of the motor housing as the motor output shaft. A shrink disc coupling is arranged on the motor output shaft. The shrink disc coupling includes an outer locking moving ring and an inner expanding ring sleeve. A plurality of first bolt holes are evenly arranged on the outer locking moving ring. The diameter of the first cavity in the outer locking moving ring gradually increases from the motor side to the outer locking moving ring side, and the formed taper angle is 2-4°. The inner expanding ring sleeve includes a deformation ring and a connecting flange. The deformation ring and the connecting flange are coaxially arranged to form a cylindrical second cavity with the same shape and size. The diameter D 二 of the output shaft 输出 and the diameter D 内 of the output shaft 外It shows a gradually increasing trend from the side of the externally locked moving ring to the side of the connecting flange, and the formed taper angle is the same as that of the externally locked moving ring. The deformation ring is axially provided with a number of symmetrically arranged shrinkage slots on the ring surface. The connecting flange is symmetrically provided with a number of first threaded holes and second threaded holes. The first threaded hole is provided with an internal thread and can cooperate with a bolt to achieve the function of fastening. The model of the first threaded hole matches that of the first bolt hole. The second threaded hole is used to connect a rotational speed and torque detector. The rotational speed and torque detector is provided with a second bolt hole, and a second bolt is arranged in the second bolt hole. The periphery of the connecting flange is also symmetrically provided with a number of notches for detecting the locked-rotor torque of the motor under test.

[0005] Further, the taper angle of the first cavity is 3°.

[0006] Further, the diameter D of the second cavity 二 and the diameter D of the output shaft 输出 have the size relationship of D 二 = 1.01 - 1.03D 输出 .

[0007] Further, the maximum diameter of the first cavity is smaller than the maximum outer diameter of the deformation ring and larger than the minimum outer diameter of the deformation ring, and the minimum diameter of the first cavity is smaller than the minimum outer diameter of the deformation ring.

[0008] Further, the number of shrinkage slots is 2 - 6.

[0009] Further, the number of shrinkage slots is 4.

[0010] Further, the length L of the shrinkage slot 缝 and the length L of the deformation ring 变 have the size relationship of L 缝 = 0.75 - 1.0L 变 .

[0011] Further, the length L of the shrinkage slot 缝 and the length L of the deformation ring 变 have the size relationship of L 缝 = 0.9L 变 .

[0012] Further, the width of the shrinkage slot is 0.5 - 2 mm.

[0013] Further, the width of the shrinkage slot is 1 mm.

[0014] Beneficial effects:

[0015] A dynamometer motor assembly provided by the present utility model, the dynamometer motor assembly includes a motor, a shrink fit coupling, and a rotational speed and torque detector. One end of the rotor extends out of the motor housing as the motor output shaft. A shrink fit coupling is provided on the motor output shaft. The shrink fit coupling includes an outer locking moving ring and an inner expansion ring sleeve. A plurality of first bolt holes are evenly provided on the outer locking moving ring. The diameter of the first cavity in the outer locking moving ring gradually increases from the motor housing side to the outer locking moving ring side, forming a taper angle of 2-4°. The inner expansion ring sleeve includes a deformation ring and a connecting flange. The taper of the outer ring surface of the deformation ring is the same as the taper angle of the outer locking moving ring. A plurality of notches are symmetrically provided on the periphery of the connecting flange. When using the dynamometer motor assembly provided by the present utility model to measure the performance (rotational speed, torque, etc.) of a motor to be measured, it is possible to avoid setting a spline on the motor output shaft, which affects the dynamic balance of the motor. The plurality of notches symmetrically provided on the periphery of the connecting flange can be conveniently used to detect the locked-rotor torque of the dynamometer motor assembly to be measured without additionally connecting other accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the dynamometer motor assembly in the present utility model;

[0017] Figure 2 is Figure 1 a sectional view taken along the A-A plane shown in the assembly drawing;

[0018] Figure 3 is Figure 1 an exploded schematic diagram of the shown assembly drawing;

[0019] Figure 4 is an assembly drawing of the shrink fit coupling and the rotational speed and torque detector in the present utility model;

[0020] Figure 5 is a schematic structural diagram of the outer locking moving ring and the first bolt in the present utility model;

[0021] Figure 6 is Figure 5 a sectional view taken along the B-B plane shown;

[0022] Figure 7 is a schematic structural diagram of the inner expansion ring sleeve in the present utility model;

[0023] Figure 8 is Figure 7 a sectional view taken along the C-C plane shown;

[0024] Figure 9 is another assembly drawing of the shrink fit coupling and the rotational speed and torque detector in the present utility model;

[0025] Figure 10 is Figure 9 a sectional view taken along the D-D plane shown.

[0026] Among them, 100 is a dynamometer motor; 1 is a rotor; 11 is an output shaft; 2 is a shrink fit coupling; 21 is an outer locking moving ring; 211 is a first cavity; 212 is a first bolt; 213 is a first bolt hole; 22 is an inner shrink ring sleeve; 221 is a connecting flange; 222 is a deformation ring; 223 is a first threaded hole; 224 is a second threaded hole; 225 is a second cavity; 226 is a shrinkage joint; 227 is a notch; 3 is a rotational speed and torque detector; 31 is a second bolt hole; 32 is a second bolt; 4 is a motor housing. Specific embodiments

[0027] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following provides a detailed description of the specific embodiments of the present utility model in conjunction with the embodiments of the specification. The methods are conventional methods unless otherwise specified, and the raw materials can be obtained from public commercial channels unless otherwise specified.

[0028] As used herein, "an embodiment" or "embodiments" refers to specific features, structures, or characteristics that may be included in at least one implementation of the present utility model. The phrase "in an embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that mutually excludes other embodiments.

[0029] As Figure 1-10 shown, the present utility model provides a dynamometer motor assembly 100. The dynamometer motor assembly 100 includes a motor 4, a shrink fit coupling 2, and a rotational speed and torque detector 3. A rotor 1 is installed inside the motor 4. One end of the rotor 1 extends out of the housing of the motor 4 as the output shaft 11 of the dynamometer motor. The shrink fit coupling 2 is sleeved on the motor output shaft 11. The shrink fit coupling 2 includes an outer locking moving ring 21 and an inner shrink ring sleeve 22. A plurality of first bolt holes 213 are evenly provided on the outer locking moving ring 21. The diameter of the first cavity 211 inside the outer locking moving ring 21 gradually increases from the side of the motor 4 to the side of the outer locking moving ring 21, forming a taper angle of 2 to 4°, preferably 3°. The inner shrink ring sleeve 22 includes a deformation ring 222 and a connecting flange 221. The deformation ring 222 and the connecting flange 221 are coaxially arranged to form a cylindrical second cavity 225 with the same shape and size. The diameter D 二 of the second cavity 225 and the diameter D 输出 of the output shaft 11 二 are matched, and D 输出。 = 1.01 to 1.03D 内 The inner ring diameter D 外From the side of the outer locking moving ring 21 to the side of the connecting flange 221, it shows a gradually increasing trend, and the formed taper angle is the same as the taper angle of the first cavity 211 of the outer locking moving ring 21. The maximum diameter of the first cavity 211 is smaller than the maximum outer diameter of the deformation ring 222 and larger than the minimum outer diameter of the deformation ring 222. The minimum diameter of the first cavity 211 is smaller than the minimum outer diameter of the deformation ring 222, so that the outer locking moving ring 21 can be sleeved on the deformation ring 222 and can be locked. The deformation ring 222 is provided with a plurality of axially symmetric shrinkage slots 226 on the ring surface. When the locking moving ring 21 is sleeved on the deformation ring 222 and moves towards the connecting flange 221, it can squeeze the deformation ring 222, causing the deformation ring 222 to tightly hold the output shaft, forming a frictional force, and transmitting the power of the output shaft 11 to the expansion joint sleeve. A plurality of first threaded holes 223 and second threaded holes 224 are symmetrically arranged on the connecting flange 221. The first threaded hole 223 is provided with an internal thread and can cooperate with a bolt to achieve a fastening effect. The model of the first threaded hole 223 matches the first bolt hole 213. The second threaded hole 224 is used to connect the rotational speed and torque detection member 3. The rotational speed and torque detection member 3 is provided with a second bolt hole 31, and a second bolt 32 is arranged in the second bolt hole 31. The second bolt 32 can fix the rotational speed and torque detection member 3 on the connecting flange 221.

[0030] A plurality of notches 227 are symmetrically arranged on the periphery of the connecting flange 221 to detect the locked-rotor torque of the motor under test.

[0031] The outer locking moving ring 21 is sleeved on the outer ring surface of the deformation ring 222. A first bolt 212 is arranged in the first bolt hole 213 of the outer locking moving ring 21. The thread on the head of the first bolt 212 is screwed into the first bolt hole on the connecting flange 221. By tightening the first bolt 212, it can move towards the connecting flange 221, so that the first cavity 211 of the outer locking moving ring 21 squeezes the outer ring surface of the deformation ring 222, forcing the shrinkage slot 226 to become smaller, thereby realizing that the deformation ring 222 tightly holds the output shaft 11.

[0032] In some embodiments, the number of the shrinkage slots is 2 - 6, preferably 4. Too many will affect the strength of the deformation ring 222, and too few will affect the dynamic balance. The length L of the shrinkage slot 226 缝 and the length L of the deformation ring 222 变 The size relationship is L 缝 = 0.75 - 1.0L 变 Preferably L 缝 = 0.9L 变， The length L of the shrinkage slot 226 缝长 If it is too short, the deformation ring 222 is difficult to deform and difficult to tightly hold the output shaft to form a large enough frictional force. The length L of the shrinkage slot 226 缝长If it is too long and extends to the connecting flange 221, it will affect the strength of the connecting flange 221.

[0033] In some embodiments, the width of the shrinkage joint 226 is 0.5 - 2 mm, preferably 1 mm. If it is too small, it is difficult for the deformation ring 222 to be sleeved on the output shaft 11. If it is too large, the effect of clamping the output shaft 11 is not good, the frictional force is insufficient, and sliding is likely to occur.

[0034] Before use, first separately detect the dynamic balance of the expansion joint 2 on a dynamic balance instrument. After passing the qualified diameter test, install it on the output shaft 11. Since the output shaft 11 is a smooth shaft (without splines on the shaft), when the expansion joint 2 with qualified dynamic balance is installed on the output shaft 11, the dynamic balance will not change, and it can be put into detection without re-detecting the dynamic balance.

[0035] During use, remove the first bolt 212 on the expansion joint 2 with qualified dynamic balance detection. First, sleeved the outer locking ring 21 on the output shaft 11, then sleeved the inner expansion ring 22 on the output shaft 11. Adjust the position on the axis of the output shaft. Move the locking ring 21 to the outer ring surface of the deformation ring 222. When moving to set resistance, install the first bolt 212 and tighten the first bolt 212 diagonally, so that the deformation ring 222 is squeezed, the shrinkage joint 226 shrinks, and the deformation ring 222 clamps the output shaft 11 to form a frictional force. In this way, when the output shaft 11 rotates, it can transmit power to the expansion joint 2. A rotational speed and torque detector 3 is provided on the connecting flange 221 of the expansion joint 2, and the rotational speed and torque detector 3 is connected to the motor under test (not shown in the figure). In this way, the working condition of the motor under test can be detected.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A dynamometer motor assembly, comprising a motor, a tightening sleeve and a speed torque detector, wherein a rotor is arranged in the motor, one end of the rotor extends out of the motor housing as a motor output shaft, and an tightening sleeve is arranged on the motor output shaft, characterized in that: The expansion connection sleeve comprises an outer locking ring and an inner expansion ring sleeve, wherein the outer locking ring is evenly provided with a plurality of first bolt holes, and the diameter of the first cavity in the outer locking ring gradually increases from the motor side to the outer locking ring side, and the formed cone angle is 2 to 4°; the inner expansion ring sleeve comprises a deformation ring and a connecting flange, wherein the deformation ring and the connecting flange are coaxially arranged to form a cylindrical second cavity of the same shape and size, and the diameter D of the second cavity is equal to the diameter D of the output shaft. 输出 Matching, the inner ring diameter D of the deformation ring 内 The size remains unchanged, the outer ring diameter D 外 It gradually increases from the outer locking dynamic ring side to the connecting flange side, and the formed cone angle is consistent with the cone angle of the first cavity of the outer locking dynamic ring. The deformation ring is axially provided with a plurality of symmetrical shrinkage seams on the ring surface, and the connecting flange is symmetrically provided with a plurality of first threaded holes and second threaded holes. The first threaded holes and the second threaded holes are provided with internal threads, which can be cooperated with bolts to achieve the function of fastening. The model of the first threaded hole matches the first bolt hole, and the second threaded hole is used to connect the speed and torque detection component. The speed and torque detection component is provided with a second bolt hole, and a second bolt is provided in the second bolt hole. The periphery of the connecting flange is also symmetrically provided with a plurality of notches for detecting the stall torque of the motor to be tested.

2. The dynamometer motor assembly according to claim 1, characterized in that: The cone angle of the first cavity is 3°.

3. The dynamometer motor assembly according to claim 1, characterized in that: The diameter D2 of the second cavity and the diameter D 输出 The size relationship is D = 1.01 ~ 1.03D 输出 .

4. The dynamometer motor assembly according to claim 1, characterized in that: The maximum diameter of the first cavity is smaller than the maximum outer diameter of the deformable ring and larger than the minimum outer diameter of the deformable ring, and the minimum diameter of the first cavity is smaller than the minimum outer diameter of the deformable ring.

5. The dynamometer motor assembly according to claim 1, characterized in that: The number of the contraction joints is 2-6.

6. The dynamometer motor assembly according to claim 5, characterized in that: The number of the contraction joints is 4.

7. The dynamometer motor assembly according to claim 1, characterized in that: The length L of the contraction joint 缝 and the length L of the deformation ring 变 The size relationship is L 缝 =0.75~1.0L 变 .

8. The dynamometer motor assembly according to claim 7, characterized in that: The length L of the contraction joint 缝 and the length L of the deformation ring 变 The size relationship is L 缝 =0.9L 变 .

9. The dynamometer motor assembly according to claim 1, characterized in that: The width of the shrinkage seam is 0.5 to 2 mm.

10. The dynamometer motor assembly according to claim 9, characterized in that: The width of the shrinkage seam is 1 mm.

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