Gear phase angle rapid detection tool

Abstract

A gear phase angle rapid detection tool relates to the technical field of gear detection and comprises a base, the base is provided with a clamping mechanism, a detection mechanism and a standard component matched with a detected gear in specification, the clamping mechanism is used for fixing the standard component or the detected gear on a detection station, and the standard component is provided with a standard hole. The center depth of the standard hole is correspondingly consistent with the middle depth of an arc-shaped transition surface of the lock pin hole of the detected gear, the detection mechanism comprises a dial indicator which can be moved up and down for adjustment, and a measuring head of the dial indicator is vertically downward so as to extend into the standard hole of the standard component or the lock pin hole of the detected gear. According to the utility model, through the pre-calibration mechanism of the standard component and the rapid positioning function of the clamping mechanism, the single-piece detection time is greatly shortened. The depth of the arc-shaped transition surfaces of the standard hole and the lock pin hole accurately corresponds to each other, and a vertical detection path of the dial indicator is matched, so that the tedious processes of multi-time point acquisition and coordinate system conversion of three-coordinate equipment are omitted, and the method is particularly suitable for production line batch detection scenes.

Description

Technical Field

[0001] This utility model relates to the field of gear testing technology, and in particular to a rapid gear phase angle testing tool. Background Technology

[0002] Camshaft phaser gears typically have two end faces, a central shaft hole, five threaded holes, and a locking pin hole. The bottom surface and inner wall surface of the locking pin hole are rounded to form an arc-shaped transition surface. For example... Figure 1 As shown, the angle formed between the right end of the locking pin hole and the next tooth from the outermost right end of the gear in the figure is the phase angle. The angle of this phase angle is 100.811°, and the tolerance usually needs to be controlled within ±0.25°. As the core component of mechanical transmission, the phase angle of the camshaft phase gear determines whether the product assembly meets the special phase angle requirements. Therefore, the phase angle needs to be measured after processing and production.

[0003] Existing inspection methods all employ traditional measurement techniques, namely coordinate measuring machines (CMMs). This method acquires the spatial coordinates of multiple feature points, such as gear tooth grooves and positioning holes, and combines this with software calculations to inversely deduce the phase angle, theoretically achieving micron-level accuracy. However, the operation process requires specialized technicians to repeatedly perform positioning, programming, and data analysis, with single-piece inspection taking up to ten minutes. Furthermore, the equipment purchase and maintenance costs are high, severely restricting inspection efficiency and economic benefits in mass production scenarios. Utility Model Content

[0004] The purpose of this invention is to provide a gear phase angle rapid detection tool that is easy to operate, has high detection efficiency, and outputs accurate measurement values.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a gear phase angle rapid detection tool, including a base, a clamping mechanism, a detection mechanism, and a standard part matching the specifications of the gear being tested. The clamping mechanism is used to fix the standard part or the gear being tested on the detection station. The standard part is provided with a standard hole, the center depth of which corresponds to the center depth of the arc transition surface of the locking pin hole of the gear being tested. The detection mechanism includes a dial indicator that can be moved up and down. The probe of the dial indicator is vertically downward for insertion into the standard hole of the standard part or the locking pin hole of the gear being tested. The dial indicator is calibrated through the standard hole, enabling the dial indicator to detect the position of the locking pin hole of the gear being tested, thereby achieving rapid detection of gear phase angle error.

[0006] Preferably, the clamping mechanism includes a circular locating pin for inserting into the center hole of the gear under test, a support column for supporting the gear under test, a locking pin for abutting one side of the gear under test, and a pressure plate for pressing the gear under test downward. The top end of the support column is also provided with a tapered locating pin for extending into the threaded hole of the gear under test.

[0007] More preferably, the clamping mechanism further includes a plurality of arc-shaped positioning blocks, which are arranged around the detection station for coarse positioning of the gear under test.

[0008] More preferably, a reference groove is provided on one side of the standard part, one end of the locking pin passes through the baffle and the guide seat, the locking pin is fitted with a first compression spring, and a limiting block is provided on the locking pin located between the baffle and the guide seat. The two ends of the first compression spring abut against the limiting block and the baffle respectively. Under the elastic force of the first compression spring, one end of the locking pin can abut against the reference groove of the standard part or abut against the tooth gap at the corresponding position of the gear being tested.

[0009] More preferably, a clamp seat is provided on the base plate, and a cantilever is rotatably connected to the clamp seat. The cantilever is connected to the pressure plate through a connecting rod. The connecting rod is also fitted with a second compression spring that abuts against the cantilever and the pressure plate. A clamp is hinged to the clamp seat. The middle part of the clamp is fixedly connected to the cantilever through a support rod. Rotating the clamp can push or pull the cantilever so that the pressure plate presses against or disengages from the gear being tested.

[0010] More preferably, the base is also provided with a storage slot for placing standard parts.

[0011] More preferably, a measuring seat is fixedly installed on the base, a guide rail is vertically installed on the measuring seat, a slide is slidably connected to the guide rail, the dial indicator is fixedly installed on the slide, the slide is provided with a dovetail groove that mates with the guide rail, and a locking bolt is provided on one side of the slide to push against the outer wall of the dovetail groove so that it presses against the guide rail and thus locks the slide.

[0012] More preferably, a handle is provided on each side of the base.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. Through the pre-calibration mechanism of standard parts and the rapid positioning function of the clamping mechanism, the single-piece inspection time is greatly shortened compared with the traditional coordinate measuring machine (CMM). The depth of the arc transition surface between the standard hole and the locking pin hole is precisely matched. Combined with the vertical inspection path of the dial indicator, the cumbersome process of multiple point sampling and coordinate system conversion required by the CMM is eliminated, making it particularly suitable for batch inspection scenarios on the production line.

[0015] 2. By pre-calibrating the dial indicator using the standard hole, operators only need three steps (clamping the standard part → zeroing → changing to the test piece for reading) to complete the test, requiring no professional measurement knowledge or programming skills. The test results are directly judged by the dial indicator pointer offset (e.g., ±0.135mm corresponds to ±0.25° angular tolerance), achieving intuitive judgment of "the dial is the result," allowing ordinary workers to operate independently after 5 minutes of training. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the gear being tested;

[0017] Figure 2 This is a schematic diagram of the overall structure of the detection tool in the embodiment;

[0018] Figure 3 This is a top view of the detection tool in the embodiment;

[0019] Figure 4 This is a schematic diagram of the structure of the standard component in the embodiment.

[0020] In the picture:

[0021] 1 - Base; 2 - Standard Part; 3 - Standard Hole

[0022] 4 - Dial indicator; 5 - Circular locating pin; 6 - Support column

[0023] 7 - Pin; 8 - Pressure plate; 9 - Arc-shaped positioning block

[0024] 10 - Baffle plate; 11 - Guide seat; 12 - First compression spring

[0025] 13 - Limiting block; 14 - Clamping seat; 15 - Cantilever.

[0026] 16 - Second compression spring; 17 - Clamp; 18 - Storage slot

[0027] 19 - Measuring base; 20 - Guide rail; 21 - Slide table

[0028] 22 - Locking bolt 23 - Handle 24 - Reference groove

[0029] 25 - Tapered locating pin. Detailed Implementation

[0030] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0031] It should be noted in advance that, in this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "on" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0032] like Figures 1 to 4 As shown, the gear phase angle rapid detection tool includes a base 1, on which a clamping mechanism, a detection mechanism, and a standard part 2 matching the specifications of the gear being tested are mounted. The clamping mechanism is used to fix the standard part 2 or the gear being tested on the detection station. The standard part 2 is provided with a standard hole 3, the center depth of which corresponds to the center depth of the arc transition surface of the locking pin hole of the gear being tested. The detection mechanism includes a dial indicator 4 that can be adjusted up and down. The probe of the dial indicator 4 is vertically downward for insertion into the standard hole 3 of the standard part 2 or the locking pin hole of the gear being tested. The dial indicator 4 is calibrated by calibrating the reading through the standard hole 3, which allows the dial indicator 4 to detect the position of the locking pin hole of the gear being tested, thereby achieving rapid detection of gear phase angle error.

[0033] In the above structure, the clamping mechanism includes a circular locating pin 5 for inserting into the center hole of the gear under test, a support column 6 for supporting the gear under test, a retaining pin 7 for abutting one side of the gear under test, and a pressure plate 8 for pressing the gear under test downwards. The top of the support column 6 is also provided with a tapered locating pin 25 for extending into the threaded hole of the gear under test. The gear under test has five threaded holes, and only three tapered locating pins 25 need to be set and inserted into three of them. The clamping mechanism also includes multiple arc-shaped locating blocks 9, which are arranged around the inspection station for coarse positioning of the gear under test. This clamping mechanism achieves rapid and accurate clamping of gears through a multi-level collaborative positioning design: the circular locating pin and the center hole are interference-fitted to ensure axial reference consistency, the tapered locating pin is inserted into the threaded hole to complete the initial circumferential angle positioning, and the arc-shaped locating blocks pre-constrain the gear outline to form a coarse positioning guide, allowing the operator to quickly place the workpiece without fine adjustment; this integrated clamping solution compresses the 15-minute positioning process required by traditional coordinate measuring machine inspection to within one minute, significantly improving the inspection speed.

[0034] In this embodiment, a reference groove 24 is provided on one side of the standard part 2. One end of the locking pin 7 passes through the baffle 10 and the guide seat 11. The locking pin 7 is fitted with a first compression spring 12. A limiting block 13 is provided on the locking pin 7 located between the baffle 10 and the guide seat 11. The two ends of the first compression spring 12 abut against the limiting block 13 and the baffle 10 respectively. Under the elastic force of the first compression spring 12, one end of the locking pin 7 can abut against the reference groove 23 of the standard part 2 or against the tooth gap at the corresponding position of the gear being tested. This mechanism achieves flexible contact positioning between the testing fixture and the gear tooth groove through the constant force buffer of the first compression spring 12 and the precise limiting of the guide seat 11. Under the action of the spring force, the locking pin 7 can adapt to the size fluctuation of the tooth gap, eliminating the positioning overshoot or tooth surface scratches caused by traditional rigid locking.

[0035] Furthermore, a clamping seat 14 is provided on the base plate 1, and a cantilever 15 is rotatably connected to the clamping seat 14. The cantilever 15 is connected to the pressure plate 8 through a connecting rod. The connecting rod is also fitted with a second compression spring 16 that abuts against the cantilever 15 and the pressure plate 8. A clamp 17 is hinged to the clamping seat 14. The middle part of the clamp 17 is fixedly connected to the cantilever 15 through a support rod. Rotating the clamp 17 can push or pull the cantilever 15, so that the pressure plate 8 can press against or disengage from the gear being tested. When the clamp 17 is rotated, the support rod and the cantilever 15 generate a lever amplification effect, so that the pressure plate 8 is subjected to heavy-load clamping. At the same time, the second compression spring 16 is triggered to provide elastic buffering at the moment the pressure plate 8 contacts the gear, eliminating the tooth surface indentation caused by rigid impact. During the clamping process, the spring compression is automatically adjusted according to the gear thickness to ensure a constant clamping force output for different batches of workpieces and avoid over-pressure deformation or insufficient clamping.

[0036] In addition, the base 1 is provided with a storage slot 18 for placing standard parts 2; a handle 23 is also provided on each side of the base 1 to improve the convenience of the tool.

[0037] A measuring seat 19 is fixedly mounted on the base 1. A guide rail 20 is vertically mounted on the measuring seat 19. A slide table 21 is slidably connected to the guide rail 20. A dial indicator 4 is fixedly mounted on the slide table 21. The slide table 21 is provided with a dovetail groove that mates with the guide rail 20. A locking bolt 22 is provided on one side of the slide table 21 to push against the outer wall of the dovetail groove so that it presses against the guide rail 20 and locks the slide table 21. This slide table locking mechanism achieves high-precision and rapid adjustment of the position of the dial indicator 4 through the precise guidance of the dovetail groove and the rigid locking of the locking bolt 22: the vertical sliding design of the guide rail 20 allows the dial indicator 4 probe to be freely positioned along the gear axis, ensuring that the probe is accurately aligned with the center of the arc transition surface of the locking pin hole; the radial pressure of the dovetail groove and the locking bolt 22 on the side wall of the guide rail 20 can quickly and rigidly fix the slide table 21, thereby eliminating measurement jitter.

[0038] The process of using the gear phase angle rapid detection tool provided by the above implementation method is roughly as follows:

[0039] Phase 1: Standard parts calibration.

[0040] First, take out the standard part 2 from the storage slot 18 and place the standard part 2 at the inspection station of the base 1. Insert the circular positioning pin 5 into the center hole of the standard part, and the tapered positioning pin 25 automatically snaps into the threaded hole of the standard part. Then, one end of the locking pin 7 abuts against the reference groove 23 of the standard part 2. Press down the clamp 17, and the linkage pressure plate 8 presses the standard part with the constant force output of the second compression spring 16 to complete the axial rigid fixation.

[0041] Then unlock the slide 21 and tighten the bolt 22. Move the slide down along the guide rail 20 so that the dial indicator 4 probe is vertically inserted into the middle part of the standard hole 3. Then zero the dial indicator and adjust the lifting and resetting three times to zero it. Record that the difference between the three zeroing readings is ≤0.01mm, which means the calibration is complete. Then move the position of the dial indicator 4 up.

[0042] Second stage: Gear phase angle detection.

[0043] First, lift the clamp 17 to release the pressure plate 8, take out the standard part 2 and put it into the storage slot 18; take the gear to be tested and repeat the clamping process. Under the action of the first compression spring 12, the locking pin 7 adaptively locks into the tooth groove gap, and the tapered positioning pin 25 locks the threaded hole simultaneously.

[0044] Then move the slide 21 down and directly read the pointer offset of the dial indicator 4 when it is inserted into the arc transition surface of the locking pin hole of the gear being tested. If the dial indicator reading is within ±0.135mm (corresponding to a phase angle tolerance of ±0.25° of 100.811°), the gear is considered qualified; otherwise, it is considered unqualified.

[0045] The principle of this invention is based on an angle-to-linear displacement conversion mechanism and mechanical positioning amplification: the angular deviation of the gear locking pin hole position is converted into the linear displacement of the dial indicator 4 probe in the vertical direction, which is then combined with the guiding and locking mechanism of the slide table 21 to achieve detection. Finally, the angular tolerance (±0.25°) is calculated by reverse calculation using the linear tolerance (±0.135mm). This invention achieves a triple breakthrough in efficiency, cost, and accuracy. Operators can perform the clamping-reading-judgment operation without professional technical training. It has a low false detection rate and is perfectly suited to the high-cycle, low-cost, and highly consistent quality control requirements of automotive gear production lines.

[0046] To facilitate understanding by those skilled in the art of the improvements of this utility model compared to the prior art, some of the accompanying drawings and descriptions of this utility model have been simplified. The above embodiments are preferred implementations of this utility model. In addition, this utility model can be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A tool for fast detection of the phase angle of a gear wheel comprising a base (1), characterized in that: The base (1) is provided with a clamping mechanism, a detection mechanism and a standard part (2) matched with the gear to be measured, the clamping mechanism is used for fixing the standard part (2) or the gear to be measured on a detection station, the standard part (2) is provided with a standard hole (3), the center depth of the standard hole (3) is consistent with the middle depth of the arc transition surface of the lock pin hole of the gear to be measured, the detection mechanism comprises a dial gauge (4) which can be adjusted up and down, the measuring head of the dial gauge (4) is vertically downward for extending into the standard hole (3) of the standard part (2) or the lock pin hole of the gear to be measured, the degree of the dial gauge (4) is calibrated through the standard hole (3), so that the dial gauge (4) detects the position of the lock pin hole of the gear to be measured to realize the rapid detection of the phase angle error of the gear.

2. The gear phase angle quick detection tool of claim 1, wherein: The clamping mechanism comprises a circular positioning pin (5) for inserting into the center hole of the gear to be measured, a supporting column (6) for supporting the gear to be measured, a clamping pin (7) for abutting against one side of the gear to be measured and a pressing plate (8) for pressing the gear to be measured downward, and the top end of the supporting column (6) is further provided with a tapered positioning pin (25) for extending into the threaded hole of the gear to be measured.

3. The gear phase angle quick detection tool of claim 2, wherein: The clamping mechanism further comprises a plurality of arc-shaped positioning blocks (9) which are arranged around the detection station for rough positioning of the gear to be measured.

4. The gear phase angle quick detection tool of claim 2, wherein: One side of the standard part (2) is provided with a reference groove (24), one end of the clamping pin (7) is provided in a baffle (10) and a guide seat (11), the clamping pin (7) is sleeved with a first compression spring (12), a limiting block (13) is arranged on the clamping pin (7) between the baffle (10) and the guide seat (11), the two ends of the first compression spring (12) are respectively abutted against the limiting block (13) and the baffle (10), and under the elastic force of the first compression spring (12), one end of the clamping pin (7) can abut against the reference groove (24) of the standard part (2) or the tooth gap of the corresponding position of the gear to be measured.

5. The gear phase angle quick detection tool of claim 2, wherein: The base (1) is provided with a pressing jaw seat (14), the pressing jaw seat (14) is rotatably connected with a cantilever (15), the cantilever (15) is connected with the pressing plate (8) through a connecting rod, the connecting rod is further sleeved with a second compression spring (16) abutting against the cantilever (15) and the pressing plate (8), the pressing jaw seat (14) is hingedly connected with a clamp jaw (17), the middle part of the clamp jaw (17) is fixedly connected with the cantilever (15) through a support rod, and rotating the clamp jaw (17) can push or pull the cantilever (15) so that the pressing plate (8) presses the gear to be measured or separates from the gear to be measured.

6. The gear phase angle quick detection tool of claim 1, wherein: The base (1) is further provided with a receiving groove (18) for placing the standard part (2).

7. The gear phase angle quick detection tool of claim 1, wherein: The base (1) is fixedly provided with a measuring seat (19), the measuring seat (19) is vertically provided with a guide rail (20), the guide rail (20) is slidably connected with a sliding table (21), the dial gauge (4) is fixedly provided on the sliding table (21), the sliding table (21) is provided with a dovetail groove matched with the guide rail (20), and one side of the sliding table (21) is provided with a locking bolt (22) for pushing the outer wall of the dovetail groove to abut against the guide rail (20) so as to lock the sliding table (21).

8. The gear phase angle quick detection tool of claim 1, wherein: Two handles (23) are further arranged on the two sides of the base (1).

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