Special gauge for testing M value of gear shaft sleeve

Abstract

The utility model relates to the technical field of gear shaft sleeve detection, and provides a gear shaft sleeve M value test special gauge comprising a seat plate, a probe seat, a fixed probe, a dial indicator seat, a dial indicator probe and a dial indicator, the probe seat and the dial indicator seat are respectively arranged on two sides of the upper surface of the seat plate, the fixed probe is detachably connected to the probe seat, and the dial indicator probe is detachably connected to the dial indicator seat. The dial indicator is installed on the dial indicator measuring pin, the dial indicator measuring pin is detachably connected to the dial indicator seat, the dial indicator measuring pin is provided with a springback assembly, the springback assembly is installed in the dial indicator seat, and M value measuring ball heads are installed at the close ends of the fixed measuring pin and the dial indicator measuring pin. The fixed measuring pin, the M value measuring ball head and the dial indicator measuring pin are positioned on the same straight line; the beneficial effects of the utility model lie in that compared with the patent CN209820369, the utility model has fewer structures, is easy to manufacture, has lower production cost, is simpler to operate, and has higher detection efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of gear bushing detection, and relates to a special fixture for testing the M value of a gear bushing. Background Technique

[0002] The M value of a gear bushing, that is, the module, is a basic parameter representing the size of a gear and is used to describe the size of the gear pitch. In gear design, the module is one of the core parameters and directly affects the external dimensions and tooth profile of the gear. Specifically, the module is defined as the ratio of the pitch diameter of the gear to the number of teeth, that is, M = d / z, where d is the pitch diameter and z is the number of teeth. The larger the module, the larger the size of the gear, and its load-bearing capacity and transmission torque increase accordingly. The pitch diameter of the gear can be calculated by the product of the module and the number of teeth: d = z × M. The pitch diameter in the formula is the reference diameter that determines most of the important dimensions of the gear.

[0003] The methods for testing the M value of the external spline of a gear bushing include traditional measurement methods, special measuring rod measurement methods, coordinate measuring methods, etc. The traditional measurement method is complex to operate and is easily affected by the change of the position of the round rod in actual operation, resulting in low measurement accuracy. The coordinate measuring machine can accurately obtain various geometric parameters of the gear through a non-contact measurement method, including the M value of the external spline. Its advantages are high measurement accuracy and the ability to provide detailed data reports, but the equipment cost is high and the operation is relatively complex; the special measuring rod measurement method is to use a special measuring rod to be tangent to the tooth groove of the workpiece and combine with a combination block or a special taper core rod for gapless sliding fit to achieve accurate and rapid detection, with low cost.

[0004] The inventor found in work that the existing special measuring rod test is not fast enough. For example, the patent with the authorization announcement number CN209820369 provides a gear M value measuring fixture. Although the measuring fixture of this utility model has a simple structure, is convenient to operate, and has high measuring efficiency and can be applied to mass detection in industrial production, in the view of the inventor, there are too many structures, such as the fixed table, the limit block, the movable plate, the linear track, the handle rod support, the handle rod, etc. are all redundant designs, resulting in more complex use and operation of the fixture, more trouble in producing the fixture, and higher cost. Therefore, there is an urgent need for a special fixture for testing the M value of a gear bushing to solve the above problems. Content of the Utility Model

[0005] In view of the above technical problems existing in the prior art, a special fixture for testing the M value of a gear bushing is provided.

[0006] The purpose and effect of the utility model are achieved by the following specific technical means:

[0007] A special gauge for testing the M value of a gear bushing, comprising: a base plate, a probe holder, a fixed probe, a dial indicator holder, a dial indicator probe and a dial indicator. The probe holder and the dial indicator holder are respectively installed on both sides of the upper surface of the base plate. The fixed probe is detachably connected to the probe holder. The dial indicator is installed on the dial indicator probe. The dial indicator probe is detachably connected to the dial indicator holder, and a rebound assembly is installed on the dial indicator probe. The rebound assembly is installed in the dial indicator holder. M value measuring ball heads are installed at the adjacent ends of the fixed probe and the dial indicator probe, and the fixed probe, the M value measuring ball head and the dial indicator probe are all located on the same straight line.

[0008] Optionally, circular holes are penetrated through the sides of the probe holder and the dial indicator holder. The fixed probe and the dial indicator probe are respectively installed in the circular holes adjacent to them, and the rebound assembly is installed in the circular hole where the dial indicator probe is located.

[0009] Optionally, a threaded hole communicating with the adjacent circular hole is opened at the top of the probe holder. A locking screw is threadedly connected in the threaded hole. After the lower end of the locking screw extends into the circular hole below it, it abuts against the fixed probe.

[0010] Optionally, the rebound assembly includes two limit rings and a spring. The two limit rings are respectively fixed at both ends inside the circular hole where they are located. The outer end of the spring is fixedly connected to the adjacent limit ring, and the inner end is fixed to the dial indicator probe.

[0011] Optionally, at least one row of threaded blind holes are opened on both sides of the upper surface of the base plate. At least one mounting hole is opened on both the probe holder and the dial indicator holder. A positioning screw is inserted into each mounting hole. The lower end of the positioning screw is threadedly connected to the adjacent threaded blind hole, and the upper end is limited in the mounting hole.

[0012] Optionally, a knob is installed at the outer end of the dial indicator probe.

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

[0014] According to the characteristics of the gear bushing itself (there are tooth blocks, and the tooth blocks are equivalent to the limit parts of the M value measuring ball head), the whole detection does not require limiting. After testing, it only takes two or three seconds to detect a gear bushing, which is fast. Simply put, during detection, just place the gear bushing while pulling the dial indicator, and then release the dial indicator to complete the detection, which can greatly improve production efficiency. From the structure and use operation of this gauge, compared with the patent of CN209820369, this application has fewer structures, is easier to manufacture, has a lower production cost of the gauge, is simpler to operate, and has a higher detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1Schematic diagram of the overall three-dimensional structure of the present utility model;

[0016] Figure 2 Schematic diagram of the structure when the inspection tool of the present utility model tests the gear shaft sleeve;

[0017] Figure 3 Schematic diagram of the main view sectional structure of the dial indicator seat of the present utility model;

[0018] Figure 4 Schematic diagram of the three-dimensional structure of the standard part of the present utility model.

[0019] Markings in the figure: base plate 1, threaded blind hole 2, probe seat 3, mounting hole 4, positioning screw 5, screw hole 6, locking screw 7, round hole 8, fixed probe 9, dial indicator seat 10, dial indicator probe 11, knob 12, dial indicator 13, limit ring 14, spring 15, M-value measuring ball head 16, standard part 17. Specific implementation mode

[0020] Please refer to Figures 1-4 , and make further explanations on the embodiments of the present utility model;

[0021] A special inspection tool for measuring the M value of a gear shaft sleeve, used for measuring the M value of the external spline of a gear shaft sleeve, including: a base plate 1, a probe seat 3, a fixed probe 9, a dial indicator seat 10, a dial indicator probe 11 and a dial indicator 13. The probe seat 3 and the dial indicator seat 10 are respectively installed on both sides of the upper surface of the base plate 1. The fixed probe 9 is detachably connected to the probe seat 3. The dial indicator 13 is installed on the dial indicator probe 11. The dial indicator probe 11 is detachably connected to the dial indicator seat 10. And a spring-back assembly is installed on the dial indicator probe 11. The spring-back assembly is installed in the dial indicator seat 10. M-value measuring ball heads 16 are installed at the adjacent ends of the fixed probe 9 and the dial indicator probe 11. And the fixed probe 9, the M-value measuring ball head 16 and the dial indicator probe 11 are all located on the same straight line. A knob 12 is installed at the outer end of the dial indicator probe 11.

[0022] The working principle of this inspection tool is as follows:

[0023] Before testing the gear shaft sleeve, pull the dial indicator 13 outwards to make the dial indicator probe 11 move outwards on the dial indicator seat 10, thereby increasing the distance between the two M-value measuring ball heads 16. During this process, the dial indicator probe 11 will compress the spring-back assembly in the dial indicator seat 10. Then place the standard part 17 on the base plate 1, and align the M-value measuring ball head 16 on the fixed probe 9 with the middle position on one side of the standard part 17. Then slowly release the dial indicator 13. The dial indicator probe 11 rebounds towards the standard part 17 under the elastic force of the spring-back assembly, so that the M-value measuring ball head 16 on the dial indicator probe 11 is aligned with the middle position on the other side of the standard part 17, and record the data in the dial indicator 13. Since there are no tooth blocks on the periphery of the standard part 17 (such asFigure 4 As shown in the figure, it is necessary to move the standard part 17 multiple times for multiple tests, and take the highest value as the diameter of the standard part 17. When reaching the highest value, manually turn the knob 12 on the micrometer 13 to zero, which is used as the reference value for the later detection of the gear shaft sleeve. After the test, remove the standard part 17.

[0024] When detecting the gear shaft sleeve, pull the micrometer 13 outwards to move the micrometer probe 11 outwards on the micrometer base 10, increasing the distance between the two M-value measuring ball heads 16. Place the gear shaft sleeve on the seat plate 1 and close to the M-value measuring ball head 16 on the fixed probe 9. Slightly rotate the gear shaft sleeve to make the M-value measuring ball head 16 directly enter between the two tooth blocks of the gear shaft sleeve. At this time, the fixed probe 9, the micrometer probe 11, and the two M-value measuring ball heads 16 all point directly to the center of the gear shaft sleeve. Slowly release the micrometer 13, and the micrometer probe 11 rebounds towards the gear shaft sleeve under the elastic force of the rebound component, so that the M-value measuring ball head 16 on the micrometer probe 11 aligns with the position between the two tooth blocks on the other side of the gear shaft sleeve, and the M value of the external spline of the gear shaft sleeve can be measured. If the pointer in the micrometer 13 points to zero, it means the gear shaft sleeve is qualified; otherwise, it is unqualified.

[0025] According to the characteristics of the gear shaft sleeve itself (it has tooth blocks, and the tooth blocks are equivalent to the limit parts of the M-value measuring ball head 16), no limit is required for the whole detection. After testing, it only takes two or three seconds to detect a gear shaft sleeve, which is fast. Simply put, during detection, just place the gear shaft sleeve while pulling the micrometer 13, and then release the micrometer 13 to complete the detection, which can greatly improve production efficiency. It should be noted that the model of the M-value measuring ball head 16 needs to be selected according to the model of the gear shaft sleeve to be measured to ensure the accuracy of the measurement. And this inspection tool can also be used to detect gears.

[0026] Judging from the structure and operation of this inspection tool, compared with the patent of CN209820369, this application has fewer structures, is easier to manufacture, has a lower production cost of the inspection tool, is simpler to operate, and has a higher detection efficiency.

[0027] As Figures 1-2 shown, both the probe seat 3 and the micrometer base 10 are penetrated with round holes 8 on the side. The fixed probe 9 and the micrometer probe 11 are respectively installed in the round holes 8 close to them, and the rebound component is installed in the round hole 8 where the micrometer probe 11 is located.

[0028] At the top of the probe seat 3, there is a threaded hole 6 that communicates with the adjacent round hole 8. A locking screw 7 is threadedly connected in the threaded hole 6. After the lower end of the locking screw 7 extends into the round hole 8 below it, it abuts against the fixed probe 9. The locking screw 7 is used to fix the locking position of the fixed probe 9. When the fixed probe 9 needs to be adjusted, the locking screw 7 in the threaded hole 6 is rotated upward. Then, the fixed probe 9 can move within the round hole 8 where it is located. After adjustment, the locking screw 7 is rotated downward to abut against the fixed probe 9 to lock the position of the fixed probe 9. This design facilitates the inspection tool to detect gear bushings of various sizes.

[0029] As Figure 1 and 3 shown, the spring-back assembly includes two limit rings 14 and a spring 15. The two limit rings 14 are respectively fixed at both ends inside the round hole 8 where they are located. The outer end of the spring 15 (the end close to the dial indicator 13) is fixedly connected to the adjacent limit ring 14, and the inner end (the end far from the dial indicator 13) is fixed on the dial indicator probe 11. When the dial indicator probe 11 moves outward, the inner end of the spring 15 will be compressed under the pulling force of the dial indicator probe 11. When the dial indicator probe 11 is released, because the spring 15 has elastic potential energy, the dial indicator probe 11 will be spring-backed. The two limit rings 14 are respectively used for limiting the inner and outer ends of the spring 15.

[0030] In order to be able to test gear bushings of more sizes, at least one row of threaded blind holes 2 is opened on both sides of the upper surface of the seat plate 1. At least one mounting hole 4 is opened on both the probe seat 3 and the dial indicator seat 10. A positioning screw 5 is inserted into each mounting hole 4. The lower end of the positioning screw 5 is threadedly connected to the adjacent threaded blind hole 2, and the upper end is limited in the mounting hole 4. When the positions of the probe seat 3 and the dial indicator seat 10 need to be adjusted, the positioning screw 5 is rotated upward to screw it out of the threaded blind hole 2 where it is located. Then, a suitable position is selected, and the mounting holes 4 on the probe seat 3 and the dial indicator seat 10 are aligned with the adjacent threaded blind holes 2. Finally, the positioning screw 5 is screwed into the corresponding threaded blind hole 2.

Claims

1. A special inspection tool for testing the M value of a gear shaft sleeve, characterized in that, Including: A seat plate (1), a probe holder (3), a fixed probe (9), a dial indicator holder (10), a dial indicator probe (11) and a dial indicator (13). The probe holder (3) and the dial indicator holder (10) are respectively installed on both sides of the upper surface of the seat plate (1). The fixed probe (9) is detachably connected to the probe holder (3). The dial indicator (13) is installed on the dial indicator probe (11). The dial indicator probe (11) is detachably connected to the dial indicator holder (10), and a spring-back component is installed on the dial indicator probe (11). The spring-back component is installed in the dial indicator holder (10). M-value measuring ball heads (16) are installed at the adjacent ends of the fixed probe (9) and the dial indicator probe (11), and the fixed probe (9), the M-value measuring ball head (16) and the dial indicator probe (11) are all on the same straight line.

2. The special fixture for testing the M value of a gear shaft sleeve according to claim 1, characterized in that: Round holes (8) penetrate through the sides of the probe holder (3) and the dial indicator holder (10). The fixed probe (9) and the dial indicator probe (11) are respectively installed in the adjacent round holes (8), and the spring-back component is installed in the round hole (8) where the dial indicator probe (11) is located.

3. The special fixture for testing the M value of a gear shaft sleeve according to claim 2, characterized in that: A threaded hole (6) communicating with the adjacent round hole (8) is opened at the top of the probe holder (3). A locking screw (7) is threadedly connected in the threaded hole (6). After the lower end of the locking screw (7) extends into the round hole (8) below it, it abuts against the fixed probe (9).

4. The special fixture for testing the M value of a gear shaft sleeve according to claim 2, characterized in that: The spring-back component includes two limit rings (14) and a spring (15). The two limit rings (14) are respectively fixed at both ends inside the round hole (8) where they are located. The outer end of the spring (15) is fixedly connected to the adjacent limit ring (14), and the inner end is fixed to the dial indicator probe (11).

5. The special gauge for testing the M value of a gear shaft sleeve according to claim 1, characterized in that: At least one row of threaded blind holes (2) is opened on both sides of the upper surface of the seat plate (1). At least one mounting hole (4) is opened on both the probe holder (3) and the dial indicator holder (10). A positioning screw (5) is inserted into each mounting hole (4). The lower end of the positioning screw (5) is threadedly connected to the adjacent threaded blind hole (2), and the upper end is limited in the mounting hole (4).

6. The special fixture for testing the M value of a gear shaft sleeve according to claim 1, wherein: A knob (12) is installed at the outer end of the dial indicator probe (11).

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