Dynamometer fixture

Abstract

The utility model discloses a kind of dynamometers clamps, it is related to testing field, this clamp is three-layer structure, one end is annular hollow structure, hollow part is motor fixed part, the inner side of clamping fixed ring is cooperated with outer layer rotating shell, the motor fixed part is located one end of the outer layer rotating shell, the inner wall of the outer layer rotating shell is equipped with sleeve bearing, another end of the outer layer rotating shell is equipped with clamp exit shaft. Through motor housing and sleeve bearing contact, and the output shaft of motor is contacted with outer layer rotating shell, when motor output shaft rotates, it can drive outer layer rotating shell to rotate while being connected with dynamometer by the clamp exit shaft set on outer layer rotating shell instead of motor shaft, the test and parameter measurement of motor can be carried out, while being adapted to different size motors by the cooperation of adjusting screw and nut on clamp fixing lug.

Description

Technical Field

[0001] This utility model relates to the field of testing, specifically to a dynamometer fixture for testing mechanical or structural components. Background Technology

[0002] Dynamometers can measure important motor parameters such as output power and output torque, and can calculate motor efficiency. However, when using a dynamometer to measure motor parameters, a load is often applied to the motor, and the motor needs to have an output shaft to perform the measurement. Some motors do not have an extended output shaft, or the extended output shaft is very short, making it difficult for dynamometers to directly measure the parameters of these motors.

[0003] The existing technology lacks a fixture that allows motors with no extended output shaft or a very short extended output shaft to have their parameters measured in a dynamometer. Therefore, these motors are usually equipped with an extended output shaft for testing. However, in actual working conditions, these motors are designed with no extended output shaft or a very short extended output shaft because they do not need to extend in the actual working conditions, which affects the normal use of the motor. For example, the "a fixture for testing a side-mounted motor" disclosed in announcement number CN110850292A can clamp and test motors of different models and sizes through lead screw adjustment, but the clamps and fixations are all for motors with output shafts, and cannot be used for clamping and testing motors without output shafts. Utility Model Content

[0004] The purpose of this invention is to provide a clamp that can fix a motor without requiring a motor extension shaft and can measure relevant parameters of the motor using a dynamometer. A further purpose of this invention is that, within a certain size range, this clamp can hold motors of different sizes and specifications.

[0005] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0006] A dynamometer fixture has a three-layer structure. One end is a ring-shaped hollow structure, and the hollow part is a motor fixing part. The inner side of the clamping and fixing ring cooperates with the outer rotating housing. The motor fixing part is located at one end of the outer rotating housing. The inner wall of the outer rotating housing is provided with a sleeve bearing. The other end of the outer rotating housing is provided with a fixture output shaft.

[0007] Furthermore, the clamping and fixing ring is a semi-ring structure, and the two clamping and fixing rings cooperate to fix the outer rotating shell.

[0008] Preferably, the outer rotating housing is provided with a fixing ring mounting groove, and the clamping fixing ring is installed in the fixing ring mounting groove.

[0009] Furthermore, the upper and lower ends of the fixed ring mounting groove cooperate with the outer rotating shell to form a first fixed ring limiting step and a second fixed ring limiting step.

[0010] Furthermore, the height of the first fixing ring limiting step to the bottom of the fixing ring mounting groove is less than the height of the second fixing ring limiting step to the bottom of the fixing ring mounting groove.

[0011] Furthermore, clamping fixing rings are provided on both sides, and the clamping fixing ears of the two clamping fixing rings cooperate with each other. The clamping fixing ears cooperate with the adjusting screw and nut to fix the clamping fixing rings on the outer rotating housing.

[0012] Furthermore, near the motor fixing part, a clamp diameter adjustment port is symmetrically provided in the axial direction of the outer rotating housing, and a deformation adaptation groove is provided on the wall of the outer rotating housing in a direction perpendicular to the clamp diameter adjustment port.

[0013] Furthermore, the sleeve bearing is provided with an opening that coincides with either of the two clamp diameter adjustment ports.

[0014] Furthermore, the motor mates with the motor fixing part, the motor shaft of the motor is flush with the height of the motor shaft end shell of the motor, and the end face of the motor shaft mates with the motor contact end face of the motor fixing part.

[0015] Furthermore, the axes of the motor shaft and the clamp output shaft coincide.

[0016] This utility model has the following beneficial effects:

[0017] The motor housing contacts the sleeve bearing, while the motor output shaft contacts the outer rotating housing. When the motor output shaft rotates, it drives the outer rotating housing to rotate. At the same time, the output shaft of the fixture set on the outer rotating housing replaces the motor shaft and connects to the dynamometer, enabling motor testing and parameter measurement. In addition, the fixture fixing ears can be fitted with adjusting screws and nuts to accommodate motors of different sizes. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the fixture of this utility model.

[0019] Figure 2 This is a schematic diagram of the main structure of this utility model.

[0020] Figure 3 This is a schematic diagram of the front cross-sectional structure of this utility model.

[0021] Figure 4This is a side view sectional structural diagram of the present invention.

[0022] Figure 5 This is a front view structural diagram of the fixture and motor assembly of this utility model.

[0023] Figure 6 This is a front view sectional view of the assembly of the clamp and motor of this utility model.

[0024] In the diagram, 1-clamp output shaft, 2-outer rotating housing, 3-sleeve bearing, 4-clamp fixing lug, 5-clamping fixing ring, 6-coupling. 7-fixing ring mounting groove, 8-first fixing ring limiting step, 9-second fixing ring limiting step, 10-clamp diameter adjustment port, 11-adjusting screw, 12-deformation adaptation groove, 13-motor, 14-motor shaft, 15-motor shaft end shell, 16-motor contact end face, 17-motor fixing part. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0026] Example 1:

[0027] like Figures 1 to 4 As shown, a dynamometer fixture has a three-layer structure. One end is a ring-shaped hollow structure, and the hollow part is a motor fixing part 17. The inner side of the clamping and fixing ring 5 cooperates with the outer rotating housing 2. The motor fixing part 17 is located at one end of the outer rotating housing 2. The inner wall of the outer rotating housing 2 is provided with a sleeve bearing 3. The other end of the outer rotating housing 2 is provided with a fixture output shaft 1.

[0028] One end of the dynamometer fixture of this invention is designed as a ring-shaped hollow structure, which forms the motor fixing part 17. The motor fixing part 17 is used to accommodate and fix the motor 13 under test. The motor fixing part 17 directly cooperates with the outer shell of the part where the motor shaft 14 of the motor 13 is located, and is used to transmit the output torque of the motor shaft 14 to the outer rotating housing 2. The other parts of the motor 13 are in contact with the sleeve bearing 3. When the outer rotating housing 2 rotates, it will not rub against the motor 13, reducing the efficiency of the motor 13 and affecting the accuracy of the dynamometer measurement.

[0029] The outer rotating housing 2 is the functional part of the fixture of this utility model. The motor fixing part 17 is located in one end of the outer rotating housing 2. A sleeve bearing 3 is placed in the inner wall of the outer rotating housing 2. The sleeve bearing 3 is sleeve-shaped and is sleeved on the outer wall of the motor 13 during the fixing of the motor 13. It can support the fixed motor housing when the outer rotating housing 2 rotates, reducing the frictional resistance encountered by the outer rotating housing 2 during rotation. The other end of the outer rotating housing 2 is provided with a fixture output shaft 1. The fixture output shaft 1 is connected to a dynamometer through a coupling to transmit the torque and speed output by the motor 13. Thus, information such as the output power and efficiency of the motor 13 can be calculated.

[0030] To ensure reliable fixation of the outer rotating housing 2 and the sleeve bearing 3 during installation with the motor 13, this invention utilizes a clamping and fixing ring 5 to securely and reliably fix the outer rotating housing 2, the sleeve bearing 3, and the motor 13 together during testing of the motor 13. The inner cylindrical surface of the clamping and fixing ring 5 mates with the outer cylindrical surface of the outer rotating housing 2, achieving relative fixation between the two through clamping force.

[0031] The clamping and fixing ring 5 has a semi-ring structure. Therefore, when it mates with the outer rotating housing 2, two clamping and fixing rings 5 ​​are required to fix the outer rotating housing 2, the sleeve bearing 3, and the motor 13 together. During assembly, the two clamping and fixing rings 5 ​​are placed in the fixing ring mounting groove 7 located on the outside of the outer rotating housing 2, and work together to surround and fix the outer rotating housing 2.

[0032] To ensure that the clamping and fixing ring 5 can be stably and reliably installed on the outer rotating housing 2 without axial sliding, a fixing ring mounting groove 7 is machined on the outer peripheral wall of the outer rotating housing 2. The fixing ring mounting groove 7 is an annular groove, and the width of the fixing ring mounting groove 7 is approximately the same as the width of the clamping and fixing ring 5, so that the clamping and fixing ring 5 can be engaged in the fixing ring mounting groove 7.

[0033] To enhance the axial positioning accuracy and stability of the clamping and fixing ring 5 within the fixing ring mounting groove 7, and to prevent axial movement of the clamping and fixing ring 5 during tightening or rotation of the outer rotating housing 2, the upper and lower ends of the fixing ring mounting groove 7, i.e., the two side walls of the fixing ring mounting groove 7, form a first fixing ring limiting step 8 and a second fixing ring limiting step 9. The first fixing ring limiting step 8 and the second fixing ring limiting step 9 form the shoulders of the fixing ring mounting groove 7. The height of the first fixing ring limiting step 8 to the bottom of the fixing ring mounting groove 7 is less than the height of the second fixing ring limiting step 9 to the bottom of the fixing ring mounting groove 7. This restricts the installation method of the clamping and fixing ring 5 with the outer rotating housing 2, requiring the clamping and fixing ring 5 to be installed with the outer rotating housing 2 from the position of the clamp exit shaft 1 along the axial direction of the clamp exit shaft 1, thus securing the clamping and fixing ring 5 within the fixing ring mounting groove 7.

[0034] The assembly and locking of the clamping and fixing rings 5 ​​are achieved through the clamping and fixing ears 4 provided on both sides of the clamping and fixing rings 5. Each semi-circular clamping and fixing ring 5 has a pair of clamping and fixing ears 4. When the two clamping and fixing rings 5 ​​are closed around the outer rotating housing 2, their respective clamping and fixing ears 4 will approach and align with each other. At this time, by passing the adjusting screw 11 through the through hole on these aligned clamping and fixing ears 4 and tightening it with the nut (not shown in the figure), the two clamping and fixing rings 5 ​​can be firmly tightened. This ensures that the clamping and fixing rings 5 ​​that are mating with each other are tightly connected, and also ensures that the inner wall of the clamping and fixing ring 5 is tightly fitted with the bottom end face of the fixing ring mounting groove 7, thereby achieving a reliable connection with the outer rotating housing 2.

[0035] Because the outer diameter of the motor 13 being tested varies depending on the model, in order to clamp and measure the dynamometer of motors 13 of different models and specifications without a shaft, the clamp of this invention has at least two clamp diameter adjustment ports 10 symmetrically opened along the axial direction of the clamp on the side wall of the motor fixing part 17, near the motor contact end face 15. The clamp diameter adjustment port 10 is an opening that penetrates the wall thickness of the outer rotating housing 2, and the clamp diameter adjustment port 10 allows the motor fixing part 17 to have a certain radial deformation capability. The outer sides of the outer rotating housing 2 located on both sides of the clamp diameter adjustment port 10 can retract inward under the compression of the clamping and fixing ring 5, thereby fitting reliably and fixing the motor 13 within a certain diameter range.

[0036] To prevent excessive stress concentration during adjustment or clamping of the outer rotating housing 2, a deformation adaptation groove 12 is provided on the wall of the outer rotating housing 2 in a direction perpendicular to the diameter adjustment port 10 of the clamp, along the circumferential direction of the housing, and orthogonal to the axial opening. The width of the deformation adaptation groove 12 is smaller than the width of the slot of the diameter adjustment port 10 of the clamp. The deformation adaptation groove 12 can reduce the resistance to the inward deformation of the outer rotating housing 2, so that the outer rotating housing 2 can stably and easily contract or expand, thereby better fitting the outer circle of the motor 13 and making the cooperation with the motor 13 more reliable.

[0037] An opening is also provided on the sleeve bearing 3. The position of the opening can coincide axially with either of the two clamp diameter adjustment ports 10. When the outer rotating housing 2 is radially adjusted through the clamp diameter adjustment port 10 and the deformation adaptation groove 12, the opening of the sleeve bearing 3 allows the sleeve bearing 3 to follow the deformation and conform to the outer diameter of the motor 13.

[0038] Example 2:

[0039] The structure of this embodiment is the same as that of Embodiment 1. It further describes how the fixture fixes the motor and assists in testing the shaftless motor on the dynamometer.

[0040] like Figures 1 to 6 As shown, a dynamometer fixture has a three-layer structure. One end is a ring-shaped hollow structure, and the hollow part is a motor fixing part 17. The inner side of the clamping and fixing ring 5 cooperates with the outer rotating housing 2. The motor fixing part 17 is located at one end of the outer rotating housing 2. The inner wall of the outer rotating housing 2 is provided with a sleeve bearing 3. The other end of the outer rotating housing 2 is provided with a fixture output shaft 1.

[0041] One end of the dynamometer fixture of this invention is designed as a ring-shaped hollow structure, which forms the motor fixing part 17. The motor fixing part 17 is used to accommodate and fix the motor 13 under test. The motor fixing part 17 directly cooperates with the outer shell of the part where the motor shaft 14 of the motor 13 is located, and is used to transmit the output torque of the motor shaft 14 to the outer rotating housing 2. The other parts of the motor 13 are in contact with the sleeve bearing 3. When the outer rotating housing 2 rotates, it will not rub against the motor 13, reducing the efficiency of the motor 13 and affecting the accuracy of the dynamometer measurement.

[0042] The outer rotating housing 2 is the functional part of the fixture of this utility model. The motor fixing part 17 is located in one end of the outer rotating housing 2. A sleeve bearing 3 is placed in the inner wall of the outer rotating housing 2. The sleeve bearing 3 is sleeve-shaped and is sleeved on the outer wall of the motor 13 during the fixing of the motor 13. It can support the fixed motor housing when the outer rotating housing 2 rotates, reducing the frictional resistance encountered by the outer rotating housing 2 during rotation. The other end of the outer rotating housing 2 is provided with a fixture output shaft 1. The fixture output shaft 1 is connected to a dynamometer through a coupling to transmit the torque and speed output by the motor 13. Thus, information such as the output power and efficiency of the motor 13 can be calculated.

[0043] To ensure reliable fixation of the outer rotating housing 2 and the sleeve bearing 3 during installation with the motor 13, this invention utilizes a clamping and fixing ring 5 to securely and reliably fix the outer rotating housing 2, the sleeve bearing 3, and the motor 13 together during testing of the motor 13. The inner cylindrical surface of the clamping and fixing ring 5 mates with the outer cylindrical surface of the outer rotating housing 2, achieving relative fixation between the two through clamping force.

[0044] The clamping and fixing ring 5 has a semi-ring structure. Therefore, when it mates with the outer rotating housing 2, two clamping and fixing rings 5 ​​are required to fix the outer rotating housing 2, the sleeve bearing 3, and the motor 13 together. During assembly, the two clamping and fixing rings 5 ​​are placed in the fixing ring mounting groove 7 located on the outside of the outer rotating housing 2, and work together to surround and fix the outer rotating housing 2.

[0045] To ensure that the clamping and fixing ring 5 can be stably and reliably installed on the outer rotating housing 2 without axial sliding, a fixing ring mounting groove 7 is machined on the outer peripheral wall of the outer rotating housing 2. The fixing ring mounting groove 7 is an annular groove, and the width of the fixing ring mounting groove 7 is approximately the same as the width of the clamping and fixing ring 5, so that the clamping and fixing ring 5 can be engaged in the fixing ring mounting groove 7.

[0046] To enhance the axial positioning accuracy and stability of the clamping and fixing ring 5 within the fixing ring mounting groove 7, and to prevent axial movement of the clamping and fixing ring 5 during tightening or rotation of the outer rotating housing 2, the upper and lower ends of the fixing ring mounting groove 7, i.e., the two side walls of the fixing ring mounting groove 7, form a first fixing ring limiting step 8 and a second fixing ring limiting step 9. The first fixing ring limiting step 8 and the second fixing ring limiting step 9 form the shoulders of the fixing ring mounting groove 7. The height of the first fixing ring limiting step 8 to the bottom of the fixing ring mounting groove 7 is less than the height of the second fixing ring limiting step 9 to the bottom of the fixing ring mounting groove 7. This restricts the installation method of the clamping and fixing ring 5 with the outer rotating housing 2, requiring the clamping and fixing ring 5 to be installed with the outer rotating housing 2 from the position of the clamp exit shaft 1 along the axial direction of the clamp exit shaft 1, thus securing the clamping and fixing ring 5 within the fixing ring mounting groove 7.

[0047] The assembly and locking of the clamping and fixing rings 5 ​​are achieved through the clamping and fixing ears 4 provided on both sides of the clamping and fixing rings 5. Each semi-circular clamping and fixing ring 5 has a pair of clamping and fixing ears 4. When the two clamping and fixing rings 5 ​​are closed around the outer rotating housing 2, their respective clamping and fixing ears 4 will approach and align with each other. At this time, by passing the adjusting screw 11 through the through hole on these aligned clamping and fixing ears 4 and tightening it with the nut (not shown in the figure), the two clamping and fixing rings 5 ​​can be firmly tightened. This ensures that the clamping and fixing rings 5 ​​that are mating with each other are tightly connected, and also ensures that the inner wall of the clamping and fixing ring 5 is tightly fitted with the bottom end face of the fixing ring mounting groove 7, thereby achieving a reliable connection with the outer rotating housing 2.

[0048] Because the outer diameter of the motor 13 being tested varies depending on the model, in order to clamp and measure the dynamometer of motors 13 of different models and specifications without a shaft, the clamp of this invention has at least two clamp diameter adjustment ports 10 symmetrically opened along the axial direction of the clamp on the side wall of the motor fixing part 17, near the motor contact end face 15. The clamp diameter adjustment port 10 is an opening that penetrates the wall thickness of the outer rotating housing 2, and the clamp diameter adjustment port 10 allows the motor fixing part 17 to have a certain radial deformation capability. The outer sides of the outer rotating housing 2 located on both sides of the clamp diameter adjustment port 10 can retract inward under the compression of the clamping and fixing ring 5, thereby fitting reliably and fixing the motor 13 within a certain diameter range.

[0049] To prevent excessive stress concentration during adjustment or clamping of the outer rotating housing 2, a deformation adaptation groove 12 is provided on the wall of the outer rotating housing 2 in a direction perpendicular to the clamp diameter adjustment port 10, along the circumferential direction of the housing, and orthogonal to the axial opening. The width of the deformation adaptation groove 12 is smaller than the width of the slot of the clamp diameter adjustment port 10. The deformation adaptation groove 12 can reduce the resistance to the inward deformation of the outer rotating housing 2, allowing the outer rotating housing 2 to contract or expand stably and easily, thereby better fitting the outer circle of the motor 13 and making the cooperation with the motor 13 more reliable.

[0050] An opening is also provided on the sleeve bearing 3. The position of the opening can coincide axially with either of the two clamp diameter adjustment ports 10. When the outer rotating housing 2 is radially adjusted through the clamp diameter adjustment port 10 and the deformation adaptation groove 12, the opening of the sleeve bearing 3 allows the sleeve bearing 3 to follow the deformation and conform to the outer diameter of the motor 13.

[0051] When the clamp of this utility model is used to fix a motor 13 without an output shaft, the height of the motor shaft end shell 15 of the motor 13 is close to the end face height of the motor shaft 14, slightly lower than the end face height of the motor shaft 14, or flush with the end face height of the motor shaft 14. The motor 13 is placed in the motor fixing part 17, so that the motor shaft end shell 15 fits against the motor contact end face 16, and the end face of the motor shaft 14 can abut against the motor contact end face 16, so that when the motor shaft 14 rotates, it drives the outer rotating shell 2 to rotate synchronously.

[0052] After the motor shaft 14 abuts against the motor contact end face 16, the clamping fixing rings 5 ​​located in the fixing ring mounting groove 7 are tightened. Specifically, the bolts and nuts on the clamp fixing ears 4 of the two clamping fixing rings 5 ​​are tightened, reducing the distance between the two clamping fixing rings 5. This, in turn, pushes the walls of the outer rotating housing 2 on both sides of the clamp diameter adjustment port 10 inward and closer together, while also compressing the annular bearing 3 inward, reducing the inner diameter of the annular bearing 3, until the annular bearing 3 is firmly in contact with the outer shell of the motor 13. The motor 13 is rotated while the outer rotating housing 2 is pinched. When the motor 13 stops rotating, the fixing is complete.

[0053] At this point, the motor is fixed to the motor base, but the fixture of this invention is not fixed in any way. Before connecting the fixture's output shaft 1 to the dynamometer, the motor 13 is first energized. When the outer rotating housing 2 rotates continuously and stably with the motor 13 energized, it indicates that the fixture and motor 13 are properly connected. The motor 13 can then be used for testing on the dynamometer. The fixture's output shaft 1 is connected to the dynamometer via coupling 6. The dynamometer and motor are energized, and the output parameters of the motor 13 are obtained on the dynamometer, completing the parameter measurement and testing of the motor 13 without an output shaft.

Claims

1. A dynamometer fixture, characterized in that, The clamp has a three-layer structure. One end is a ring-shaped hollow structure. The hollow part is the motor fixing part (17). The inner side of the clamping fixing ring (5) cooperates with the outer rotating shell (2). The motor fixing part (17) is located at one end of the outer rotating shell (2). The inner wall of the outer rotating shell (2) is provided with a sleeve bearing (3). The other end of the outer rotating shell (2) is provided with a clamp output shaft (1).

2. The dynamometer fixture according to claim 1, characterized in that, The clamping and fixing ring (5) is a semi-ring structure, and the two clamping and fixing rings (5) cooperate to fix the outer rotating shell (2).

3. The dynamometer fixture according to claim 1, characterized in that, The outer rotating housing (2) is provided with a fixing ring mounting groove (7), and the clamping fixing ring (5) is installed in the fixing ring mounting groove (7).

4. A dynamometer fixture according to claim 3, characterized in that, The upper and lower ends of the fixed ring mounting groove (7) cooperate with the outer rotating shell (2) to form the first fixed ring limiting step (8) and the second fixed ring limiting step (9).

5. A dynamometer fixture according to claim 4, characterized in that, The height of the first fixed ring limiting step (8) to the bottom of the fixed ring mounting groove (7) is less than the height of the second fixed ring limiting step (9) to the bottom of the fixed ring mounting groove (7).

6. A dynamometer fixture according to claim 2, characterized in that, The clamping and fixing ring (5) is provided with clamping and fixing ears (4) on both sides. The clamping and fixing ears (4) of the two clamping and fixing rings (5) cooperate with each other. The clamping and fixing ears (4) cooperate with the adjusting screw (11) and the nut to fix the clamping and fixing ring (5) on the outer rotating shell (2).

7. A dynamometer fixture according to any one of claims 1, 2, 3, 4, 5, or 6, characterized in that, Near the motor fixing part (17), a clamp diameter adjustment port (10) is symmetrically provided in the axial direction of the outer rotating housing (2), and a deformation adaptation groove (12) is provided on the wall of the outer rotating housing (2) in a direction perpendicular to the clamp diameter adjustment port (10).

8. A dynamometer fixture according to claim 7, characterized in that, The sleeve bearing (3) has an opening that coincides with either of the two clamp diameter adjustment ports (10).

9. A dynamometer fixture according to claim 1, 2, 3, 4, 5, 6, or 8, characterized in that, The motor (13) is fitted with the motor fixing part (17), the motor shaft (14) of the motor (13) is flush with the height of the motor shaft end shell (15) of the motor (13), and the end face of the motor shaft (14) is in contact with the motor contact end face (16) of the motor fixing part (17).

10. A dynamometer fixture according to claim 9, characterized in that, The axes of the motor shaft (14) and the clamp output shaft (1) coincide.

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