An expandable mandrel for a gear measuring machine

Abstract

The utility model discloses an expandable mandrel for a gear measuring machine, comprising a mandrel, a sliding sleeve, and a claw. The mandrel is provided with a radial sliding groove and a ramp-shaped groove. The sliding sleeve is arranged on the mandrel, and the sliding sleeve is provided with a limited set screw, and the limited set screw extends into the sliding groove. Three ramp-shaped grooves are arranged and evenly distributed along the circumference of the mandrel. A claw is slidably arranged in each ramp-shaped groove, and the claw gradually retracts when sliding up along the ramp-shaped groove. The claw is provided with an outer assembly surface for matching with the inner hole of the gear to be measured, and the outer assembly surface is provided with a groove, and an elastic ring is provided in the groove for retracting the claw. The lower end of the claw is slidably connected with the sliding sleeve and can slide radially. For gears with different inner diameters, the expandable mandrel can easily clamp and quickly locate the center hole of the gear, which greatly reduces the labor intensity of maintenance workers and improves work efficiency. The invention has extremely high promotion value and practical value.

Description

Technical Field

[0001] The utility model relates to the technical field of general mechanical tooling, in particular to an expandable mandrel for a gear measuring machine. Background Art

[0002] Gear measuring machines are currently widely used for precision inspection of gear parts. Before inspecting gear parts, it is necessary to ensure that the center axis of the gear is coaxial with the center axis of the gear measuring machine. Currently, commonly used measuring tools include three-jaw chucks (universal tools) and taper mandrels (special tools). Due to the wide variety of gear specifications, three-jaw chucks have low efficiency and poor accuracy. Taper mandrels have high accuracy but high production costs and poor versatility. They are basically dedicated to specific uses. In addition, a large number of tapered mandrels occupy a large storage space. It is urgent to design an efficient and widely applicable expandable mandrel to improve inspection efficiency and reduce the number of tools. Utility Model Content

[0003] In view of the above-mentioned defects in the prior art, the purpose of the utility model is to provide an expandable mandrel for a gear measuring machine, which is safe, reliable, practical and efficient, and can be applied to the measurement and clamping conditions of gears with various inner diameters.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A kind of expandable mandrel for gear measuring machine comprises a mandrel, a sliding sleeve and a claw, wherein the mandrel is provided with a radial sliding groove and a ramp-shaped groove; the sliding sleeve is arranged on the mandrel, the sliding sleeve comprises a horizontal circular ring stage, a vertical limit sleeve is arranged at the lower end of the inner hole of the horizontal circular ring stage, a limit set screw is arranged on the vertical limit sleeve, and the limit set screw extends into the sliding groove; three ramp-shaped grooves are arranged and are evenly distributed along the circumference of the mandrel, a claw is slidably arranged in each ramp-shaped groove, and the claw gradually retracts when sliding up along the ramp-shaped groove; the claw is provided with an outer assembly surface for matching with the inner hole of the gear to be measured, the outer assembly surface is provided with a groove, and an elastic ring is arranged in the groove for retracting the claw; a connecting seat is arranged at the lower end of the claw, and the horizontal circular ring stage is provided with a radial strip hole corresponding to the connecting seat, and the radial strip hole is connected to the connecting seat through a sliding component so that the claw can move along the radial strip hole.

[0006] Furthermore, the bottom slope of the sloped slot faces obliquely upwards;

[0007] Specifically, the clamping claw is provided with a positioning inclined surface with the same inclination as the ramp-shaped clamping groove, the positioning inclined surface faces obliquely downward, and the positioning inclined surface of the clamping claw is in contact with the bottom of the ramp-shaped clamping groove.

[0008] Further, the sliding assembly includes a sliding auxiliary member and an auxiliary screw;

[0009] Specifically, the connection seat is provided with an axial screw hole, the lower end of the radial strip hole is provided with a countersunk groove, and a sliding auxiliary piece is provided in the countersunk groove and the radial strip hole, and the sliding auxiliary piece is connected to the screw hole through an auxiliary screw.

[0010] Furthermore, the sliding auxiliary component includes a pin sleeve and a bearing. The pin sleeve is sleeved on the threaded column of the auxiliary screw, the pin sleeve is slidingly matched with the radial strip, the bearing is sleeved into the threaded column and contacts the nut of the auxiliary screw, and the outer wall of the bearing is slidingly matched with the countersunk groove.

[0011] Furthermore, the outer assembly surface is an arc surface, and the circumscribed circles of all the outer assembly surfaces always form a cylindrical surface, so that the claws can fit tightly with the gear to be tested.

[0012] Furthermore, the outer assembly surface is a stepped surface, the stepped surface includes at least two steps, and each step includes a vertical arc surface and a horizontal positioning surface;

[0013] Specifically, the circumscribed circles of the vertical arc surfaces of the same layer always form cylindrical surfaces, so that the claws can closely match the gear to be tested;

[0014] Specifically, the bottom vertical arc surface is provided with a first clamping groove, and all the first clamping grooves are provided with a first elastic ring;

[0015] Specifically, the uppermost vertical arc surface is provided with a second clamping groove, and all the second clamping grooves are provided with a second elastic ring.

[0016] Furthermore, the first elastic ring and the second elastic ring are both spring rings.

[0017] Furthermore, both ends of the core shaft are provided with positioning center holes.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] For gears with different inner diameters, the expandable mandrel can easily clamp and quickly locate the center hole of the gear. After the gear to be measured is inserted into the claw, it can be gently shaken downward to clamp and automatically center it through its own weight, and the gear measurement center line can be quickly found. To prevent loosening during the measurement process, the limit set screws can be tightened with a wrench, and then the tooling can be installed into the upper and lower centers of the gear measuring machine and clamped, and it can be tested. After the measurement is completed, the gear can be easily removed by shaking it downward in the opposite direction. The operation is simple, which greatly reduces the labor intensity of maintenance workers and improves work efficiency. The invention has extremely high promotion value and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of an expandable mandrel for a gear measuring machine of the utility model;

[0021] Figure 2 It is a side sectional view of the utility model;

[0022] Figure 3 It is a top view of the utility model.

[0023] In the figure: 1 core shaft, 2 limit locking screw, 3 sliding sleeve, 4 screw, 5 pin, 6 bearing, 7 oil seal spring, 8 claw, 9 oil seal spring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Embodiment 1:

[0026] See also Figures 1 to 3 The utility model provides an expandable mandrel for a gear measuring machine, comprising a mandrel 1, a sliding sleeve 3, and a claw 8.

[0027] The core shaft 1 is provided with radial sliding grooves and ramp-shaped slots. Both ends of the core shaft 1 are provided with positioning center holes for cooperating with the two tops of the gear measuring machine to achieve rapid centering.

[0028] The sliding sleeve 3 is sleeved on the core shaft 1, and the sliding sleeve 3 includes a horizontal circular ring stage and a vertical limit sleeve. The vertical limit sleeve is arranged at the lower end of the inner hole of the horizontal circular ring stage. The vertical limit sleeve is provided with a limit locking screw 2, and the limit locking screw 2 extends into the sliding groove to achieve radial limitation and prevent the claw 8 from escaping and rotating. The sliding sleeve 3 can slide up and down along the sliding groove. After clamping the workpiece, the limit locking screw 2 is screwed in and pressed to the bottom of the sliding groove to achieve complete fixation of the sliding sleeve 3 and prevent the workpiece from loosening.

[0029] There are three ramp-shaped slots, which are evenly distributed along the circumference of the core shaft 1. The bottom slope of the ramp-shaped slot faces obliquely upward. The claw 8 is provided with an inner positioning slope with the same slope as the ramp-shaped slot, and the positioning slope faces obliquely downward. Each ramp-shaped slot is provided with a claw 8, and the positioning slope of the claw 8 fits with the bottom of the ramp-shaped slot. The claw 8 can slide up and down along the ramp-shaped slot.

[0030] The clamping jaw 8 is provided with an external assembly surface, which is an arc surface. The circumscribed circles of all external assembly surfaces always constitute a cylindrical surface, so that the clamping jaw can tightly cooperate with the gear to be tested. The external assembly surface is provided with a groove, and elastic rings are provided in the grooves of all clamping jaws 8. The elastic ring enables the clamping jaw 8 to always sit in the sloped groove.

[0031] A connecting seat is provided at the lower end of the clamping claw 8, and an axial screw hole is provided on the connecting seat. The horizontal annular platform is provided with radial strip holes corresponding to the screw holes. A countersunk groove is provided at the lower end of the radial strip holes. A sliding auxiliary part is provided in the countersunk groove and the radial strip holes, and the sliding auxiliary part is connected to the screw hole through an auxiliary screw 4.

[0032] Wherein, the elastic ring is a spring ring;

[0033] Among them, the sliding auxiliary parts include a pin sleeve 5 and a bearing 6. The pin sleeve 5 is sleeved on the threaded column of the auxiliary screw 4, the pin sleeve 5 is slidingly matched with the radial bar, the bearing 6 is sleeved into the threaded column and contacts the nut of the auxiliary screw 4, and the outer wall of the bearing 6 is slidingly matched with the groove.

[0034] When using an expandable mandrel for a gear measuring machine according to this embodiment, the following steps are included:

[0035] S1. Loosen the limit set screw 2, move the sliding sleeve 3 to the upper end of the sliding groove, put the inner hole of the gear to be tested into the claw 8, and use the upper end surface of the connecting seat as the positioning surface;

[0036] S2. Move the sliding sleeve 3 downward, and the three claws 8 are driven by the sliding sleeve 3 to slide axially downward and radially outward at the same time. The elastic ring on the claws 8 makes the claws 8 fit tightly with the core shaft 1 and keep the height consistent. Therefore, the diameter of the circumscribed circle of the claws 8 gradually increases until the gear to be measured is firmly clamped, and it has a self-centering function. Use a wrench to tighten the limit set screw 2 to prevent the gear from loosening during the measurement process;

[0037] S3, install the expandable mandrel into the gear measuring machine and use the upper and lower positioning center holes of the mandrel 1 to clamp the expandable mandrel tooling. After clamping, measure the gear;

[0038] S4. After the measurement is completed, loosen the limit screw 2 with a wrench, invert the expandable mandrel, shock the expandable mandrel, and the sliding sleeve 3 drives the three claws 8 to slide radially inward. The diameter of the circumscribed circle of the three claws 8 is reduced, and the gear to be measured is loosened and taken out. In this process, the three claws 8 are kept in contact with the mandrel 1 by the action of the elastic ring.

[0039] Embodiment 2:

[0040] On the basis of Example 1, the outer assembly surface is a stepped surface, which includes at least two steps, each step includes a vertical arc surface and a horizontal positioning surface, and the circumscribed circle of the vertical arc surface of the same layer always constitutes a cylindrical surface, so that the claw can tightly cooperate with the gear to be tested, the bottom vertical arc surface is provided with a first groove, and all the first grooves are provided with a first elastic ring 7, the top vertical arc surface is provided with a second groove, and all the second grooves are provided with a second elastic ring 9, so that the claw 8 can tightly cooperate with the sloped groove.

[0041] Wherein, the first elastic ring 7 and the second elastic ring 9 are both spring rings.

[0042] Among them, the stepped surface allows the device to measure gears with larger diameters.

[0043] When using an expandable mandrel for a gear measuring machine according to this embodiment, the following steps are included:

[0044] F1. Determine the position of the clamping jaw 8 according to the inner diameter of the gear to be tested. Select the upper position for small diameter and the lower position for large diameter. Loosen the limit set screw 2 and push the sliding sleeve 3 upward. During the upward push, the clamping jaw 8 is radially retracted inward under the action of the first elastic ring 7 and the second elastic ring 9, and the diameter of the circumscribed circle of the clamping jaw 8 becomes smaller until the gear to be tested can be loaded.

[0045] F2. After the end face of the gear to be measured fits the horizontal positioning surface of the claw 8, push the gear downward, and the claw 8 and the sliding sleeve 3 slide axially downward while the claw 8 slides radially outward until it cannot be pushed anymore. Vibrate the expandable mandrel and the gear together to ensure that the claw 8 clamps the gear, and then tighten the limit set screw 2 to ensure that the gear does not loosen during the measurement process;

[0046] F3. Install the expandable mandrel into the gear measuring machine and clamp the expandable mandrel with the upper and lower centers to measure the gear;

[0047] F4. After the measurement is completed, remove the expandable mandrel, loosen the limit set screw 2, turn the expandable mandrel upside down, and shake it. At this time, the sliding sleeve 3 and the claw 8 drive the gear to slide until the diameter of the circumscribed circle of the claw 8 becomes smaller. Then send the gear in and take out the gear, and the measurement is completed.

[0048] The utility model has novel design and compact structure, can clamp gears conveniently and efficiently, is suitable for gear measuring machines to accurately measure gear working conditions, is easy to operate, greatly reduces the labor intensity of maintenance workers, improves work efficiency, and has extremely high promotion value and practical value.

[0049] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0050] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0051] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0052] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An expandable mandrel for a gear measuring machine, comprising a mandrel, characterized in that: It also includes a sliding sleeve and a claw, and the core shaft is provided with a radial sliding groove and a ramp-shaped groove; The sliding sleeve is arranged on the core shaft, and the sliding sleeve comprises a horizontal circular ring platform, a vertical limit sleeve is arranged at the lower end of the inner hole of the horizontal circular ring platform, and a limit set screw is arranged on the vertical limit sleeve, and the limit set screw extends into the sliding groove; The ramp-shaped slots are provided with three and are evenly distributed along the circumference of the core shaft. A claw is slidably provided in each ramp-shaped slot, and the claw gradually retracts when sliding up along the ramp-shaped slot. The clamping claw is provided with an outer assembly surface for matching with the inner hole of the gear to be tested, and the outer assembly surface is provided with a clamping groove, and an elastic ring is provided in the clamping groove for retracting the clamping claw; A connecting seat is arranged at the lower end of the clamping claw, and a radial strip hole corresponding to the connecting seat is arranged on the horizontal circular ring stage. The radial strip hole is connected to the connecting seat through a sliding component so that the clamping claw can move along the radial strip hole.

2. The expandable mandrel for a gear measuring machine according to claim 1, characterized in that: The bottom slope of the sloped slot faces obliquely upward; The clamping claw is provided with a positioning inclined surface with the same inclination as the ramp-shaped clamping groove, and the positioning inclined surface faces obliquely downward, and the positioning inclined surface of the clamping claw is in contact with the bottom of the ramp-shaped clamping groove.

3. The expandable mandrel for a gear measuring machine according to claim 1, characterized in that: The sliding assembly includes a sliding auxiliary member and an auxiliary screw; The connecting seat is provided with an axial screw hole, the lower end of the radial strip hole is provided with a sink groove, and a sliding auxiliary piece is provided in the sink groove and the radial strip hole, and the sliding auxiliary piece is connected to the screw hole through an auxiliary screw.

4. The expandable mandrel for a gear measuring machine according to claim 3, characterized in that: The sliding auxiliary part includes a pin sleeve and a bearing. The pin sleeve is sleeved on the threaded column of the auxiliary screw, the pin sleeve is slidably matched with the radial strip, the bearing is sleeved into the threaded column and contacts the nut of the auxiliary screw, and the outer wall of the bearing is slidably matched with the recessed groove.

5. The expandable mandrel for a gear measuring machine according to claim 1, characterized in that: The outer assembly surface is an arc surface, and the circumscribed circles of all the outer assembly surfaces always form a cylindrical surface, so that the claws can be tightly matched with the gear to be tested.

6. The expandable mandrel for a gear measuring machine according to claim 1, characterized in that: The outer assembly surface is a stepped surface, the stepped surface includes at least two steps, and each step includes a vertical arc surface and a horizontal positioning surface; The circumscribed circles of the vertical arc surfaces on the same layer always form cylindrical surfaces, so that the claws can fit tightly with the gear to be tested; The bottom vertical arc surface is provided with a first clamping groove, and all the first clamping grooves are provided with a first elastic ring; The uppermost vertical arc surface is provided with a second clamping groove, and all the second clamping grooves are provided with a second elastic ring.

7. The expandable mandrel for a gear measuring machine according to claim 6, characterized in that: The first elastic ring and the second elastic ring are both spring rings.

8. An expandable mandrel for a gear measuring machine according to any one of claims 1 to 7, characterized in that: Both ends of the core shaft are provided with positioning center holes.

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