Gear machining rotary positioning tool with improved structure

Abstract

The utility model provides a gear processing rotation positioning frock of improved structure belongs to mechanical technical field. It has solved the problem that the existing frock is not good in adaptability. The utility model discloses a cylindrical base and vertical fixed positioning rod in the base, positioning rod upper end stretches the base, and the positioning rod upper end is equipped with the ring and is screwed with the nut, and the nut is pressed on the top surface of the ring, and the base top surface and the ring form the clamping mouth for horizontal clamping gear, and the base is composed of the cylindrical seat body and the support ring fixed horizontally on the seat body top, and the support ring top surface and the ring form the clamping mouth, and the support ring is vertically penetrated with two arc grooves, and the two arc grooves are vertically equipped with the pin shaft, and the both ends of pin shaft stretch the arc groove, and the inner wall of arc groove is formed with the annular surface for supporting the pin shaft upwards, and the lower end of pin shaft is screwed with the pressure cap, and the pressure cap is at the seat body outside, and the pressure cap is pressed on the support ring bottom surface. The utility model is good in adaptability.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a gear machining rotary positioning fixture, particularly a gear machining rotary positioning fixture with an improved structure. Background Technology

[0002] Gear machining rotary positioning fixtures are tools or equipment specifically used in gear machining processes to ensure that gears maintain precise position and stability during rotation and positioning.

[0003] Existing positioning fixtures, such as the gear machining rotary positioning fixture (CN223146164U) previously proposed by the applicant, include a cylindrical base and a positioning rod vertically fixed inside the base. The upper end of the positioning rod extends out of the base, and a pressure ring is fitted onto the upper end of the positioning rod, along with a nut screwed onto it. The nut presses against the top surface of the pressure ring, and a clamping opening for horizontally clamping the gear is formed between the top surface of the base and the pressure ring. A key block can also be detachably fixed to the upper end of the positioning rod, and the key block is located in the clamping opening. A ring of positioning holes is vertically opened on the top surface of the base, and the positioning holes are evenly distributed around the circumference of the base. A linkage rod and a spring that tend to extend the upper end of the linkage rod out of the corresponding positioning hole are vertically installed inside the positioning hole. The lower end of the linkage rod and the inner wall of the positioning hole always maintain a sliding connection.

[0004] The aforementioned positioning fixture utilizes a linkage rod inserted into a bolt hole on the gear to achieve circumferential engagement between the base and the gear, allowing the gear to stably rotate with the base. However, this fixture still has a problem: since the actual gear product may have 3, 4, or 5 bolt holes, but in the above fixture, the circumferential position of the linkage rod is fixed, the fixture can only be used with a certain type of gear, resulting in poor practicality. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a gear machining rotary positioning fixture with a better adaptability.

[0006] The objective of this utility model can be achieved through the following technical solution: A gear machining rotary positioning fixture with an improved structure includes a cylindrical base and a positioning rod vertically fixed inside the base. The upper end of the positioning rod extends out of the base, and a pressure ring is fitted onto the upper end of the positioning rod, along with a nut screwed onto it. The nut presses against the top surface of the pressure ring, and a clamping opening for horizontally clamping the gear is formed between the top surface of the base and the pressure ring. The base is characterized by being composed of a cylindrical seat body and a support ring horizontally fixed to the top of the seat body. The support ring and the seat body are coaxially arranged, and the clamping opening is formed between the top surface of the support ring and the pressure ring. Two arc grooves coaxial with the support ring are vertically penetrating the support ring, and the two arc grooves are symmetrically arranged along the central axis of the support ring. A pin is vertically provided in each of the two arc grooves, and both ends of the pin extend out of the arc groove. The pin can slide circumferentially along the arc groove. An annular surface for upward support of the pin is formed on the inner wall of the arc groove. A pressure cap is screwed onto the lower end of the pin, and the pressure cap is located outside the seat body and is pressed against the bottom surface of the support ring.

[0007] When in use, for gears with a ring of vertically arranged bolt holes, first slide the pin to align it with two of the bolt holes on the gear, then tighten the pressure cap to lock the pin on the support ring. When the gear is clamped between the support ring and the pressure plate, the upper ends of the two pins are inserted into two of the bolt holes on the gear, so that a stable circumferential fit is formed between the base and the gear, ensuring that the gear accurately follows the base.

[0008] The distance between the two pins can be changed by sliding the pins to better adapt to the changes in the arrangement of bolt holes on different gears, thereby expanding the application range of this positioning fixture and making it more practical.

[0009] In the gear machining rotary positioning fixture with the improved structure described above, the support ring and the seat are detachably fixed together, so that the whole consisting of the support ring and the pin can be replaced, thereby further improving the scope of use of the fixture and making it more practical.

[0010] In the aforementioned improved gear machining rotary positioning fixture, a support ring presses against the top surface of the base. The support ring has a vertically penetrating stepped hole, and the base has a corresponding threaded hole. The number of stepped holes and threaded holes are the same, and their positions correspond one-to-one. Each stepped hole contains a screw, with the screw shank screwed into the corresponding threaded hole, and the screw head completely enclosed within the upper end of the stepped hole. This design facilitates the installation and positioning of the support ring.

[0011] In the aforementioned improved gear machining rotary positioning fixture, a guide ring coaxial with the base is integrally formed on the top of the base. The shape and size of the guide ring match the inner hole of the support ring, and the support ring is sleeved on the outside of the guide ring. The guide ring is provided for guiding the installation of the support ring and facilitating its assembly.

[0012] In the aforementioned improved gear machining rotary positioning fixture, the arc groove consists of an upper groove body and a lower groove body arranged coaxially, with the groove width of the upper groove body being greater than that of the lower groove body. The bottom surface of the upper groove body is the aforementioned annular surface. This design facilitates the design and forming of the arc groove.

[0013] In the gear machining rotary positioning fixture with the above-mentioned improved structure, the pin is composed of a cylinder and an external threaded post that mates with the pressure cap. The cylinder is positioned above the external threaded post, the outer diameter of the cylinder is larger than the outer diameter of the external threaded post, and the bottom surface of the cylinder presses against the aforementioned annular surface.

[0014] In the aforementioned improved gear machining rotary positioning fixture, the upper outer surface of the cylinder is a conical surface with a diameter that gradually increases from top to bottom, and the upper side of the conical surface extends to the top surface of the cylinder. The conical surface facilitates the insertion of the cylinder into the gear bolt hole.

[0015] Compared with existing technologies, the improved gear machining rotary positioning fixture has the following advantages: 1. The distance between the two pins can be changed by sliding the pins to better adapt to the changes in the arrangement of bolt holes on different gears, thereby expanding the application range of this positioning fixture and making it more practical.

[0016] 2. The support ring and the base are detachably fixed, which allows the entire assembly consisting of the support ring and the pin to be replaced, thereby further expanding the tooling's application range and improving its practicality. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the gear machining rotary positioning fixture of this improved structure.

[0018] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0019] Figure 3 This is a 3D schematic diagram of the base.

[0020] In the diagram, 1. Positioning rod; 1a. Annular shoulder; 2. Base; 2a. Seat body; 2a1. Guide ring; 2b. Support ring; 2c. Through hole; 2d. Circular groove; 2d1. Annular surface; 2d2. Upper groove body; 2d3. Lower groove body; 2e. Annular step; 3. Pressure ring; 4. Nut; 5. Gear; 6. Key block; 7. Pin; 7a. Cylinder; 7b. External threaded column; 7c. Conical surface; 8. Pressure cap; 9. Cylindrical pin; 10. Screw. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] Example 1: As Figure 1 and Figure 3 As shown, the gear machining rotary positioning fixture of this improved structure includes a cylindrical base 2 and a positioning rod 1 vertically fixed inside the base 2. The positioning rod 1 and the base 2 are coaxially arranged, and the upper end of the positioning rod 1 extends out of the base 2.

[0023] in, The base 2 has at least two vertical through holes 2c at its bottom, which are evenly distributed around the circumference of the base 2. In use, the base 2 is positioned on the drive end of the power component by bolts engaging with the through holes 2c, so that the power component drives the base 2 to rotate.

[0024] The upper end of the positioning rod 1 is fitted with a pressure ring 3 and a screwed nut 4. The nut 4 presses against the top surface of the pressure ring 3, and a clamping opening for horizontally clamping the gear 5 is formed between the top surface of the base 2 and the pressure ring 3. A key block 6 is detachably fixed to the upper outer wall of the positioning rod 1, and the key block 6 is located in the clamping opening. In the actual product, a mounting groove matching the key block 6 is opened on the upper outer wall of the positioning rod 1. One end of the key block 6 is inserted into the mounting groove, and the key block 6 is detachably fixed to the positioning rod 1 by a horizontally set screw 10.

[0025] The base 2 consists of a cylindrical seat body 2a and a support ring 2b horizontally fixed to the top of the seat body 2a. The support ring 2b and the seat body 2a are coaxially arranged, and the aforementioned clamping opening is formed between the top surface of the support ring 2b and the pressure ring 3. Wherein, as Figure 1 and Figure 2 As shown, the positioning rod 1 is fixedly connected to the base 2a; the aforementioned through hole 2c is provided on the base 2a; two arc grooves 2d, coaxial with the support ring 2b, are vertically penetrating the support ring 2b, and the two arc grooves 2d are symmetrically arranged along the central axis of the support ring 2b. A pin 7 is vertically provided in each of the two arc grooves 2d, with both ends of the pin 7 extending out of the arc groove 2d, and the pin 7 can slide circumferentially along the arc groove 2d. An annular surface 2d1 for upward support of the pin 7 is formed on the inner wall of the arc groove 2d, and a pressure cap 8 is screwed to the lower end of the pin 7. The pressure cap 8 is located outside the base 2a and is pressed tightly against the bottom surface of the support ring 2b.

[0026] When using, For gear 5 with a keyway on its inner wall, first remove pin 7. When gear 5 is clamped between support ring 2b and pressure plate, key block 6 is in keyway so that positioning rod 1 and gear 5 form a stable circumferential fit, so that gear 5 accurately follows the base 2.

[0027] For gear 5 with a ring of vertically arranged bolt holes, insert pin 7 and slide pin 7 to align it with two of the bolt holes of gear 5. Then tighten the pressure cap 8 to lock pin 7 onto support ring 2b. When gear 5 is clamped between support ring 2b and pressure plate, the upper ends of the two pins 7 are respectively inserted into two of the bolt holes of gear 5, so that a stable circumferential fit is formed between base 2 and gear 5, ensuring that gear 5 accurately follows the operation of base 2.

[0028] The distance between the two pins 7 can be changed by sliding pin 7 to better adapt to the changes in the arrangement of bolt holes on different gears 5, thereby expanding the application range of this positioning fixture and making it more practical.

[0029] In this embodiment, The positioning rod 1 and the seat 2a are connected as follows: the positioning rod 1 and the seat 2a are welded together. Specifically, an annular shoulder 1a is integrally formed on the lower outer wall of the positioning rod 1, and the annular shoulder 1a and the positioning rod 1 are coaxially arranged. An annular step 2e matching the annular shoulder 1a is formed on the lower inner wall of the seat 2a. The annular shoulder 1a is inserted into the annular step 2e and pressed against the bottom wall of the annular step 2e, and the annular shoulder 1a and the seat 2a are welded together. Further, a lower circular hole is vertically penetrating the annular shoulder 1a, and an upper circular hole is vertically formed on the bottom wall of the annular step 2e. The same cylindrical pin 9 is embedded in both the upper and lower circular holes. With the cooperation of the upper and lower circular holes and the cylindrical pin 9, the coaxiality of the positioning rod 1 and the seat 2a can be effectively strengthened, and the rotational accuracy can be improved.

[0030] like Figures 1 to 3 As shown, the support ring 2b and the base 2a are detachably fixed together, allowing the entire assembly of the support ring 2b and pin 7 to be replaced, further expanding the tooling's usability and improving its practicality. Specifically, the support ring 2b presses against the top surface of the base 2a. A stepped hole is vertically penetrating the support ring 2b, and this stepped hole is located inside the arc groove 2d. Corresponding threaded holes are provided on the base 2a. The number of stepped holes and threaded holes are the same, and their positions correspond one-to-one. Each stepped hole contains a screw 10, the shank of which is screwed into the corresponding threaded hole, with the head of the screw 10 completely enclosed within the upper end of the stepped hole. This design facilitates the installation and positioning of the support ring 2b. Preferably, there are two screws 10, resulting in two stepped holes and two threaded holes. Further, a guide ring 2a1, coaxial with the base 2a, is integrally formed on the top of the base 2a. The shape and size of the guide ring 2a1 match the inner hole of the support ring 2b, and the support ring 2b is sleeved on the outside of the guide ring 2a1. A guide ring 2a1 is provided to guide the installation of the support ring 2b and facilitate the assembly of the support ring 2b.

[0031] like Figure 3As shown, the specific structure of the arc groove 2d is as follows: The arc groove 2d consists of an upper groove body 2d2 and a lower groove body 2d3 arranged coaxially. The upper groove body 2d2 and the lower groove body 2d3 are connected, and the groove width of the upper groove body 2d2 is greater than the groove width of the lower groove body 2d3. The bottom surface of the upper groove body 2d2 is the aforementioned annular surface 2d1, and the shape and size of the upper groove body 2d2 are matched with the pin 7. This design facilitates the design and forming of the arc groove 2d.

[0032] The structure of the pin 7 is as follows: The pin 7 is an integral structure, consisting of a cylinder 7a and an external threaded post 7b that mates with the pressure cap 8. The cylinder 7a is positioned above the external threaded post 7b, the outer diameter of the cylinder 7a is larger than the outer diameter of the external threaded post 7b, and the bottom surface of the cylinder 7a presses against the aforementioned annular surface 2d1.

[0033] In actual products, the ratio of the arc length of the circular groove 2d to the circumference of the entire circle containing the circular groove 2d is 0.3 to 0.4; the outer surface of the upper end of the cylinder 7a is a conical surface 7c with a diameter that gradually increases from top to bottom, and the upper side of the conical surface 7c extends to the top surface of the cylinder 7a. The conical surface 7c is provided to facilitate the insertion of the cylinder 7a into the bolt hole of the gear 5.

[0034] Example 2: The structure and principle of Example 2 are the same as those of Example 1. The difference is that the support ring 2b is threaded to the outside of the guide ring 2a1 to achieve a detachable connection between the support ring 2b and the seat 2a.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A modified gear machining rotary positioning fixture, comprising a cylindrical base (2) and a positioning rod (1) vertically fixed inside the base (2), the upper end of the positioning rod (1) extending out of the base (2), a pressure ring (3) fitted onto the upper end of the positioning rod (1) and a nut (4) screwed onto it, the nut (4) pressing against the top surface of the pressure ring (3), and a clamping opening for horizontally clamping a gear (5) being formed between the top surface of the base (2) and the pressure ring (3), characterized in that, The base (2) consists of a cylindrical seat (2a) and a support ring (2b) horizontally fixed to the top of the seat (2a). The support ring (2b) and the seat (2a) are coaxially arranged, and the clamping opening is formed between the top surface of the support ring (2b) and the pressure ring (3). Two circular arc grooves (2d) coaxial with the support ring (2b) are vertically penetrating the support ring (2b), and the two circular arc grooves (2d) are symmetrically arranged along the central axis of the support ring (2b). A pin (7) is vertically installed in both arc grooves (2d), and both ends of the pin (7) extend out of the arc groove (2d); the pin (7) can slide around the arc groove (2d) in the circumference. An annular surface (2d1) for supporting the pin (7) upward is formed on the inner wall of the arc groove (2d). A pressure cap (8) is screwed to the lower end of the pin (7). The pressure cap (8) is located outside the seat (2a) and is pressed against the bottom surface of the support ring (2b).

2. The gear machining rotary positioning fixture with the improved structure according to claim 1, characterized in that, The aforementioned support ring (2b) and seat (2a) are detachably fixed together.

3. The gear machining rotary positioning fixture with the improved structure according to claim 2, characterized in that, The support ring (2b) presses against the top surface of the base (2a). The support ring (2b) has a vertical stepped hole, and the base (2a) has a corresponding threaded hole. The number of stepped holes and threaded holes are the same and their positions correspond one-to-one. Each stepped hole is equipped with a screw (10). The shank of the screw (10) is screwed into the corresponding threaded hole, and the head of the screw (10) is completely enclosed in the upper end of the stepped hole.

4. The improved gear machining rotary positioning fixture according to claim 3, characterized in that, The top of the base (2a) is integrally formed with a guide ring (2a1) coaxial with the base (2a). The shape and size of the guide ring (2a1) are matched with the inner hole of the support ring (2b), and the support ring (2b) is sleeved on the outside of the guide ring (2a1).

5. The gear machining rotary positioning fixture with the improved structure according to claim 1, characterized in that, The circular groove (2d) is composed of an upper groove body (2d2) and a lower groove body (2d3) arranged coaxially, and the groove width of the upper groove body (2d2) is greater than the groove width of the lower groove body (2d3). The bottom surface of the upper groove body (2d2) is the aforementioned annular surface (2d1).

6. The gear machining rotary positioning fixture with the improved structure according to claim 5, characterized in that, The pin (7) consists of a cylinder (7a) and an external threaded post (7b) that mates with the pressure cap (8). The cylinder (7a) is positioned above the external threaded post (7b). The outer diameter of the cylinder (7a) is larger than the outer diameter of the external threaded post (7b), and the bottom surface of the cylinder (7a) presses against the aforementioned annular surface (2d1).

7. The gear machining rotary positioning fixture with the improved structure according to claim 6, characterized in that, The outer surface of the upper end of the cylinder (7a) is a conical surface (7c) with a diameter that gradually increases from top to bottom, and the upper side of the conical surface (7c) extends to the top surface of the cylinder (7a).

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