Universal fast-assembly shaft current test tool

Abstract

The invention discloses a universal fast-assembly shaft current testing tool which comprises a tool fixing assembly and a probe adjusting assembly, the tool fixing assembly comprises a base, an adjusting disc and a plurality of fixing clamping jaws, the base comprises a mounting cylinder and a matching disc, a plurality of open grooves are annularly formed in the matching disc, a plurality of arc-shaped grooves are annularly formed in the adjusting disc, and the probe adjusting assembly is arranged on the mounting cylinder. The adjusting disc is installed on the installation cylinder in a sleeving mode, a plurality of fixed clamping jaws are annularly installed on the outer side of the matching disc and extend into the open groove, meanwhile, the fixed clamping jaws are connected with driving sliding blocks, the driving sliding blocks extend into the arc-shaped grooves, and an anti-reverse-rotation assembly is arranged between the adjusting disc and the base. According to the universal fast-assembly shaft current testing tool, the opening radiuses of the multiple fixed clamping jaws are uniformly adjusted through the mechanical linkage mechanism, one set of tool can adapt to spigots of different models of motors within a certain size range, and meanwhile, an anti-loosening structure and a probe radial rigid guide rail locking and axial mechanical anti-rotation design are arranged; and the whole tool has excellent vibration resistance.

Description

Technical Field

[0001] This invention relates to the field of shaft current testing fixture technology, and more specifically to a general-purpose quick-assembly shaft current testing fixture. Background Technology

[0002] A shaft current testing fixture, also known as a shaft current (voltage) testing fixture for permanent magnet synchronous motors, is a fixing and clamping device used to collect shaft voltage and shaft current data of permanent magnet synchronous motors. Its main purpose is to serve as a fixing device for the test probe, so that the probe can make stable contact with the motor shaft.

[0003] There are two types of existing shaft current testing fixtures: one type is modified from the resolver cover of the motor under test. This type of fixture is only suitable for specific motor models and has poor versatility. Different fixtures need to be prepared when measuring multiple motors, which wastes costs and resources. In addition, some vehicle models do not reserve enough space at the resolver cover position for personnel to disassemble and install the cover and fixture, which makes the installation of the fixture very time-consuming. The other type is a cantilever fixture. This type of fixture can be attached to the frame by magnets. In order to ensure a high degree of freedom, multiple rigid or flexible arms are used. This structure has a large deflection and is only suitable for stable and vibration-free working conditions such as laboratory measurements. When measuring in the vehicle working site, there is often vibration. When the vibration is transmitted to the conductive connector at the end of the cantilever, it will be amplified, which can easily cause poor contact between the conductive connector and the shaft under test, resulting in distorted test data. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a general-purpose quick-release shaft current testing fixture. This fixture uses a mechanical linkage mechanism to uniformly adjust the opening radius of multiple fixed jaws, allowing one set of fixtures to adapt to the stops of different models of motors within a certain size range. It also features an anti-loosening structure, a rigid guide rail locking the probe radially, and a mechanical anti-rotation design in the axial direction, giving the fixture excellent vibration resistance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A general-purpose quick-release shaft current testing fixture includes: The tooling fixing assembly includes a base, an adjusting plate, and several fixing claws. The base includes a mounting cylinder and a mating plate. The mating plate has several slots around its circumference, and the adjusting plate has several arc-shaped grooves around its circumference. The adjusting plate is fitted onto the mounting cylinder. Several fixing claws are annularly mounted on the outside of the mating plate and extend into the slots. The fixing claws are connected to a drive slider, which extends into the arc-shaped grooves. When the drive slider moves in the arc-shaped grooves, it can drive the fixing claws to retract or open. An anti-reverse rotation assembly is provided between the adjusting plate and the base to prevent the adjusting plate from rotating in the opposite direction. A probe adjustment assembly includes a probe bracket and a probe. The probe bracket is mounted on a base, and a radial adjustment assembly is provided between the probe bracket and the base. The probe is mounted on the probe bracket, and an axial adjustment assembly is provided between the probe and the probe bracket.

[0006] Furthermore, the anti-reverse assembly includes a base cover, a spring, a first one-way gear plate, and a second one-way gear plate. The base cover is installed on the top of the mounting cylinder. The spring is fitted onto the mounting cylinder and located between the adjusting plate and the base cover, connecting the two. The first one-way gear plate and the second one-way gear plate are respectively disposed on the opposite end faces of the adjusting plate and the mating plate, and are in contact with each other.

[0007] Furthermore, the radial adjustment assembly includes an adjustment frame and an adjustment screw. The adjustment frame is installed on both sides of the probe bracket and has an adjustment slot. The base has a mounting threaded hole at the top, and the adjustment screw passes through the adjustment slot and extends into the mounting threaded hole.

[0008] Furthermore, the axial adjustment assembly includes a probe holder with an adjustment threaded hole. The probe is connected to a threaded post that extends into the adjustment threaded hole, and the probe is located below the probe holder.

[0009] Furthermore, an insertion groove is provided above the probe mounting base, an anti-rotation block is provided in the insertion groove, an anti-rotation groove is provided on the anti-rotation block, and an anti-rotation post is provided on the top of the threaded post, the anti-rotation post being able to extend into the anti-rotation groove.

[0010] Furthermore, the mounting cylinder is provided with a plurality of threaded holes, and the base cover is provided with a plurality of mounting holes. A connecting screw is provided in the mounting hole, and the connecting screw passes through the mounting hole and extends into the threaded hole.

[0011] Furthermore, the clamping surface of the fixed claw is provided with a textured or flexible material layer to increase friction.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. High versatility and low cost: By uniformly adjusting the opening radius of multiple fixed jaws through a mechanical linkage mechanism, one set of tooling can adapt to the stop of different models of motors within a certain size range, completely solving the drawback of "one machine, one tooling" and greatly reducing the manufacturing, management and purchase costs of tooling.

[0013] 2. Quick installation and easy operation: Fixing the tooling only requires rotating the adjustment disc to retract and lock the jaws, and adjusting the probe is accomplished through simple sliding and turning. The entire installation process requires no special tools, is quick, and has low space requirements, greatly improving on-site testing efficiency, and is particularly suitable for installation sites with limited space.

[0014] 3. Reliable connection and good vibration resistance: The fixture adopts an anti-loosening structure combining a one-way gear plate and spring clamping, as well as a rigid guide rail locking in the radial direction of the probe and a mechanical anti-rotation design in the axial direction, giving the fixture excellent overall vibration resistance. This effectively avoids poor contact caused by loosening under complex working conditions such as vehicle operation, ensuring the accuracy and reliability of test data.

[0015] 4. Compact structure and high rigidity: The overall structural layout is reasonable, abandoning the long cantilever structure and adopting a central base support, which makes the tooling small in size, light in weight, and highly portable. At the same time, the high rigidity of key connection parts effectively reduces vibration transmission and structural deformation, providing a stable installation benchmark for the test probe.

[0016] 5. Easy maintenance and long service life: This invention mainly adopts a purely mechanical structure with simple, robust, and durable parts, and no precision or easily damaged components. Most of the structure is exposed, making it easy to observe the usage status and perform daily cleaning and maintenance, effectively extending the service life of the tooling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 A schematic diagram of the structure of a general-purpose quick-assembly shaft current testing fixture; Figure 2 A cross-sectional view of a general-purpose quick-assembly shaft current testing fixture; Figure 3 An exploded view of a general-purpose quick-assembly shaft current testing fixture; Figure 4 This is a schematic diagram of the probe's structure.

[0018] The markings in the diagram are as follows: 1. Base; 101. Mounting cylinder; 102. Mating disc; 103. Slot; 2. Adjusting disc; 3. Fixing claw; 4. Spring; 5. Base cover; 6. Connecting screw; 7. Probe bracket; 8. Anti-rotation block; 9. Adjusting screw; 10. Drive slider; 11. Arc groove; 12. Adjusting frame; 13. Second unidirectional gear disc; 14. Probe fixing seat; 15. Probe; 16. Threaded post; 17. Anti-rotation post. Detailed Implementation

[0019] In the description of this invention, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this invention, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0021] A general-purpose quick-release shaft current testing fixture, such as Figure 1-4 As shown, it includes: The tooling fixing assembly includes a base 1, an adjusting plate 2, and several fixing claws 3. The base 1 includes an mounting cylinder 101 and a mating plate 102. The mating plate 102 is provided with several slots 103 around its circumference. The adjusting plate 2 is provided with several arc-shaped grooves 11 around its circumference, and the adjusting plate 2 is fitted onto the mounting cylinder 101. Several fixing claws 3 are installed around the outside of the mating plate 102 and extend into the slots 103. At the same time, the fixing claws 3 are connected to a driving slider 10. The driving slider 10 extends into the arc-shaped grooves 11. When the driving slider 10 moves in the arc-shaped grooves 11, it can drive the several fixing claws 3 to retract or open. An anti-reverse rotation assembly is provided between the adjusting plate 2 and the base 1. The anti-reverse rotation assembly is used to prevent the adjusting plate 2 from rotating in the opposite direction. The probe adjustment assembly includes a probe bracket 7 and a probe 15. The probe bracket 7 is mounted on a base 1, and a radial adjustment assembly is provided between the probe bracket 7 and the base 1. The probe 15 is mounted on the probe bracket 7, and an axial adjustment assembly is provided between the probe 15 and the probe bracket 7.

[0022] Preferably, the anti-reverse assembly includes a base cover 5, a spring 4, a first one-way gear plate and a second one-way gear plate 13. The base cover 5 is installed on the top of the mounting cylinder 101. The spring 4 is fitted onto the mounting cylinder 101 and is located between the adjusting plate 2 and the base cover 5, connecting the two. The first one-way gear plate and the second one-way gear plate 13 are respectively disposed on the end faces opposite to the adjusting plate 2 and the mating plate 102, and are in contact with each other. Specifically, the spring 4 provides a continuous axial clamping force, which makes the first and second one-way toothed discs 13 located on the mating end faces of the adjusting disc 2 and the base 1 tightly mesh. The characteristics of the one-way toothed discs allow the adjusting disc 2 to rotate in one direction (tightening direction), while the rotation in the opposite direction is blocked by the inclined surface of the teeth, thereby achieving mechanical self-locking. This structure achieves a perfect combination of "stepless adjustment" and "mechanical anti-loosening." The operator can quickly adjust the fixing jaw 3 to any desired diameter, and it automatically locks in place upon release, requiring no additional wrench or tightening steps. Compared to traditional bolt locking or friction locking, this gear disc structure offers extremely high reliability in preventing loosening under vibration conditions, effectively ensuring the stability of the connection between the tooling and the motor stop during testing, fundamentally avoiding test data distortion caused by tooling loosening.

[0023] Preferably, the radial adjustment assembly includes an adjustment frame 12 and an adjustment screw 9. The adjustment frame 12 is installed on both sides of the probe bracket 7, and the adjustment frame 12 is provided with an adjustment through groove. The base 1 is provided with a mounting threaded hole at the top, and the adjustment screw 9 passes through the adjustment through groove and extends into the mounting threaded hole. Specifically, a linear motion mechanism of the "slot-screw" type is adopted. The adjustment brackets 12 on both sides of the probe bracket 7 form a sliding pair with the top of the base 1 through the adjustment screws 9. By loosening the adjustment screws 9, the probe bracket 7 can slide freely along the adjustment slot; by tightening the adjustment screws 9, the screw head generates friction between the adjustment bracket 12 and the surface of the base 1, firmly locking the bracket. The structure is simple in design, and adjustments are intuitive and quick. The operator can visually align the probe with the end face of the rotating shaft for both coarse and precise positioning. This guide rail structure ensures the probe's linearity and stability during radial movement, with stiffness far exceeding that of a cantilever beam structure, effectively resisting external vibrations and ensuring a constant position of the probe's contact point with the rotating shaft.

[0024] Preferably, the axial adjustment assembly includes a probe mounting base 14, which has an adjustment threaded hole. The probe 15 is connected to a threaded post 16, which extends into the adjustment threaded hole, and the probe 15 is located below the probe mounting base 14. Preferably, the probe mounting base 14 has an insertion groove on top, an anti-rotation block 8 is provided in the insertion groove, the anti-rotation block 8 has an anti-rotation groove, and the threaded post 16 has an anti-rotation post 17 on top, which can extend into the anti-rotation groove. Specifically, axial adjustment employs a classic "threaded pair" transmission. By rotating the probe 15, the threaded post 16 on it is screwed into or out of the threaded hole in the probe mounting base 14, achieving precise axial feed. To overcome the possibility of accidental loosening of the probe 15 after contacting the rotating shaft, an independent anti-rotation structure is added: after the probe 15 is installed in place, the anti-rotation block 8 is embedded in the extension groove of the mounting base, so that its anti-rotation groove engages with the anti-rotation post 17 on the top of the probe 15.

[0025] This threaded adjustment provides precise and reliable axial position control, ensuring stable and appropriate contact pressure between the probe and the shaft end face. The independent mechanical anti-rotation structure (anti-rotation block 8) is decoupled from the axial adjustment function, solving the problem of unreliability in preventing loosening solely through thread friction. This achieves "double locking" of the probe, further enhancing the reliability of the testing system under long-term vibration conditions.

[0026] Preferably, the mounting cylinder 101 is provided with a plurality of threaded holes, and the base cover 5 is provided with a plurality of mounting holes. A connecting screw 6 is provided in the mounting hole, and the connecting screw 6 passes through the mounting hole and extends into the threaded hole, thereby realizing the mounting connection between the base cover 5 and the mounting cylinder 101.

[0027] Preferably, the clamping surface of the fixed claw 3 is provided with a textured or flexible material layer to increase friction; Specifically, by adding textures (such as knurling or embossing) or adhering a layer of flexible material (such as rubber or polyurethane) to the clamping surface of the jaws, the coefficient of friction between the jaws and the inner wall of the motor stop is increased. The texture or flexible layer effectively prevents the tooling from sliding circumferentially or moving axially after installation, especially on smooth metal surfaces. This not only improves the stability of the installation but also reduces the over-reliance on the surface machining precision of the motor stop, further enhancing the versatility and adaptability of the tooling.

[0028] Usage Process: The usage process of this general-purpose quick-release shaft current testing fixture mainly includes four stages: fixture fixing, probe adjustment, test verification, and disassembly and recycling. The specific steps are as follows: Step 1: Fixture fixing and installation radius adjustment 1. Preliminary positioning: Place the entire fixture at the stop of the motor to be tested, so that the clamping surfaces of several fixed claws 3 are initially engaged with the inner wall of the stop.

[0029] 2. Tighten the adjusting plate 2: Rotate the adjusting plate 2 clockwise. The arc groove 11 on the adjusting plate 2 will rotate accordingly, and through the drive slider 10 in the groove, it will drive all the fixed claws 3 to move outward synchronously and evenly along the slot 103 on the mating plate 102 of the base 1.

[0030] 3. Automatic Locking: Once the fixing claw 3 is tightly fitted against the inner wall of the motor stop and the required clamping force is achieved, the adjusting disc 2 is released. At this time, under the axial pressing force of the spring 4, the second one-way gear disc 13 at the bottom of the adjusting disc 2 meshes tightly with the first one-way gear disc on the mating disc 102 of the base 1, forming a mechanical self-locking mechanism. This effectively prevents the adjusting disc 2 from rotating in the opposite direction in a vibrating environment and thus from loosening. At this point, the fixture is quickly and reliably fixed to the motor.

[0031] Step 2: Radial and axial adjustment of the probe position 1. Radial coarse adjustment: Loosen the adjusting screws 9 on both sides of the probe adjusting assembly. After loosening, the entire probe bracket 7 can slide freely on the guide rail at the top of the base 1 via the adjusting brackets 12 on both sides.

[0032] 2. Radial Alignment: Visually inspect the probe bracket 7 and slide it until the probe fixing cylinder at its front end is precisely aligned with the center area of ​​the end of the motor shaft. After alignment, immediately tighten the adjusting screws 9 on both sides to securely lock the radial position of the probe bracket 7.

[0033] 3. Axial fine-tuning and contact: Screw the threaded post 16 of the test probe 15 into the adjusting threaded hole of the probe mounting base 14 below the probe bracket 7. Slowly rotate the probe 15 to feed it smoothly toward the end face of the shaft until you can confirm by hand or with a multimeter that the probe 15 and the end face of the shaft have formed a stable and reliable physical contact.

[0034] 4. Axial anti-loosening: After confirming good contact, insert the anti-rotation block 8 into the extension groove above the probe mounting base 14, ensuring that the anti-rotation groove on the anti-rotation block 8 engages with the anti-rotation post 17 at the top of the probe 15. This operation effectively prevents the probe 15 from rotating out on its own due to vibration during testing, achieving mechanical anti-loosening of the axial position.

[0035] Step 3: Testing and Verification After completing the above installation and adjustment, the resistance between the fixture base 1 and the motor housing can be measured using the continuity setting of a multimeter. If the circuit is continuous, it proves that a good electrical contact has been formed between the probe 15 and the shaft, and formal shaft voltage and shaft current data acquisition can be performed.

[0036] Step 4: Disassembly and Recycling After the test, the disassembly process is the reverse of the installation process: 1. First, remove the anti-rotation block 8; 2. Unscrew the test probe 15 from the probe holder 14; 3. If the entire tooling needs to be disassembled, simply lift the adjusting plate 2 upwards with a little force. After lifting the adjusting plate 2, even if the first one-way gear plate and the second one-way gear plate 13 are disengaged, the fixed chuck 3 can be easily retracted by rotating it counterclockwise after lifting. This method has a very low risk of causing wear on the gear plate when disassembling the tooling.

[0037] advantage: 1. High versatility and low cost: By uniformly adjusting the opening radius of multiple fixed jaws 3 through a mechanical linkage mechanism, one set of tooling can adapt to the stop of different models of motors within a certain size range, completely solving the drawback of "one machine, one tooling" and greatly reducing the manufacturing, management and purchase costs of tooling.

[0038] 2. Quick installation and easy operation: Fixing the tooling only requires rotating the adjustment disc 2 to retract and lock the jaws, and adjusting the probe is accomplished through simple sliding and turning. The entire installation process requires no special tools, is quick, and has low space requirements, greatly improving on-site testing efficiency, and is particularly suitable for installation sites with limited space.

[0039] 3. Reliable connection and good vibration resistance: The fixture adopts an anti-loosening structure combining a one-way gear disc and spring 4 clamping, as well as a rigid guide rail locking in the radial direction of the probe and a mechanical anti-rotation design in the axial direction, giving the fixture excellent overall vibration resistance. This effectively avoids poor contact caused by loosening under complex working conditions such as vehicle operation, ensuring the accuracy and reliability of test data.

[0040] 4. Compact structure and high rigidity: The overall structural layout is reasonable, abandoning the long cantilever structure and adopting a central base 1 for support, which makes the tooling small in size, light in weight, and highly portable. At the same time, the high rigidity of key connection parts effectively reduces vibration transmission and structural deformation, providing a stable installation benchmark for the test probe.

[0041] 5. Easy maintenance and long service life: This invention mainly adopts a purely mechanical structure with simple, robust, and durable parts, and no precision or easily damaged components. Most of the structure is exposed, making it easy to observe the usage status and perform daily cleaning and maintenance, effectively extending the service life of the tooling.

[0042] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A general-purpose quick-assembly shaft current testing fixture, characterized in that, The utility model relates to a tool fixing assembly, probe adjusting assembly and probe, and belongs to the technical field of tool fixing. The tool fixing assembly comprises a base, an adjusting disc and a plurality of fixing clamps, the base comprises a mounting cylinder and a matching disc, a plurality of slots are arranged on the matching disc in a ring shape, a plurality of arc-shaped slots are arranged on the adjusting disc in a ring shape, the adjusting disc is sleeved on the mounting cylinder, the plurality of fixing clamps are arranged on the outer side of the matching disc in a ring shape and extend into the slots, meanwhile, the fixing clamps are connected with driving sliding blocks, the driving sliding blocks extend into the arc-shaped slots, when the driving sliding blocks move in the arc-shaped slots, the plurality of fixing clamps can be driven to close or open, an anti-reverse rotating assembly is arranged between the adjusting disc and the base, and the anti-reverse rotating assembly is used for preventing the adjusting disc from rotating reversely. The probe adjusting assembly comprises a probe support and a probe, the probe support is mounted on the base, and a radial adjusting assembly is arranged between the probe support and the base, the probe is mounted on the probe support, and an axial adjusting assembly is arranged between the probe and the probe support.

2. The universal quick-mount shaft current test tool of claim 1, wherein: The anti-reverse rotating assembly comprises a base upper cover, a spring, a first one-way tooth disc and a second one-way tooth disc, the base upper cover is mounted on the top of the mounting cylinder, the spring is sleeved on the mounting cylinder and connected with the adjusting disc and the base upper cover, the first one-way tooth disc and the second one-way tooth disc are arranged on the opposite end faces of the adjusting disc and the matching disc respectively and contact each other.

3. The universal quick-mount shaft current test fixture of claim 1, wherein: The radial adjusting assembly comprises an adjusting frame and an adjusting screw, the adjusting frame is mounted on both sides of the probe support, adjusting through-slots are arranged on the adjusting frame, threaded holes are arranged on the top of the base, and the adjusting screw extends into the threaded holes through the adjusting through-slots.

4. The universal quick-mount shaft current test fixture of claim 1, wherein: The axial adjusting assembly comprises a probe fixing seat, threaded holes are arranged on the probe fixing seat, a threaded column is connected with the probe, the threaded column extends into the threaded holes, and the probe is located below the probe fixing seat.

5. The universal quick-mount shaft current test fixture of claim 4, wherein: A through groove is arranged above the probe fixing seat, an anti-rotation block is arranged in the through groove, an anti-rotation groove is arranged on the anti-rotation block, an anti-rotation column is arranged on the top of the threaded column, and the anti-rotation column can extend into the anti-rotation groove.

6. The universal quick-mount shaft current test fixture of claim 2, wherein: A plurality of connecting threaded holes are arranged on the mounting cylinder, a plurality of mounting holes are arranged on the base upper cover, connecting screws are arranged in the mounting holes, and the connecting screws extend into the connecting threaded holes through the mounting holes.

7. The universal quick-mount shaft current test fixture of claim 1, wherein: The clamping surface of the fixing clamp is provided with a texture or a flexible material layer for increasing friction.

Images