A positioning fixture for gear machining

Abstract

The utility model provides a kind of gear processing positioning fixture, belong to mechanical technical field.It solves the problem of inconvenient adaptation of existing fixture to different gears.This gear processing positioning fixture includes cylindrical base and the drive rod vertically arranged in base, drive rod upper end projects base, and the side wall of drive rod upper end is detachably fixed with key block, drive rod upper end is also sleeved with compression ring and is screwed with nut, and nut is pressed in the top of compression ring, and drive rod lower end is detachably fixed with base;Drive rod middle part outer wall has a taper surface one with gradually reducing diameter from top to bottom, and the inner wall of base is formed with taper surface two matched with taper surface one, and taper surface two is pasted on taper surface one;Drive rod upper end outer wall is also horizontally formed with annular limit seat, and clamping opening is formed between limit seat and compression ring;Key block is in clamping opening;Limit seat is vertically provided with power rod, and power rod is at least two, and power rod lower end is detachably fixed with limit seat.This gear processing positioning fixture is convenient for adapting different gears.

Description

Technical Field

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

[0002] Gear machining 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 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 ring of positioning holes is 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 arranged 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: the circumferential position of the linkage rod is fixed, meaning the fixture can only be used with a specific type of gear. To accommodate different gears, the entire fixture needs to be removed from the drive end and a new fixture installed. After installing the new fixture, the coaxiality needs to be recalibrated, making the process rather cumbersome. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a gear machining positioning fixture that is easy to adapt to different types of gears.

[0006] The objective of this utility model can be achieved through the following technical solution: A gear processing positioning fixture includes a cylindrical base and a drive rod vertically disposed within the base. The upper end of the drive rod extends out of the base, and a key block is detachably fixed to the upper side wall of the drive rod. A pressure ring is also fitted onto the upper end of the drive rod, and a nut is screwed onto it, with the nut pressing against the top of the pressure ring. The lower end of the drive rod is detachably fixed to the base. The outer wall of the middle part of the drive rod has a tapered surface with a diameter that gradually decreases from top to bottom. A tapered surface two matching the tapered surface one is formed on the inner wall of the base, and the tapered surface two is attached to the tapered surface one. A ring-shaped limiting seat is also horizontally formed on the outer wall of the upper end of the drive rod, and a clamping opening for horizontally clamping the gear is formed between the limiting seat and the pressure ring. The key block is located within the clamping opening. A power rod is vertically disposed on the limiting seat, with at least two power rods distributed along the circumference of the base, and the lower end of the power rod is detachably fixed to the limiting seat.

[0007] In use, for gears with keyways on the inner wall, the power rod is removed, and a key block is used to cooperate with the keyway to form a stable circumferential fit between the drive rod and the gear, so that the gear can accurately follow the base.

[0008] For gears with a ring of vertically arranged bolt holes, remove the key block. When the gear is clamped between the limit seat and the pressure plate, at least part of the power rod is inserted into the corresponding bolt hole to form a stable circumferential fit between the drive rod and the gear, so that the gear can accurately follow the base.

[0009] The power rod and key block are detachably integrated onto the drive rod, and the drive rod is detachably fixed to the base. This allows for the matching of more different types of gears without disassembling the base, by assembling or disassembling the power rod, key block, or the whole formed by the drive rod, power rod, and key block. This effectively improves the adaptability of the fixture and makes it highly practical.

[0010] At the same time, when the drive rod is inserted into the base, the first conical surface will adhere to the second conical surface to directly correct the position of the drive rod, so that the drive rod and the base maintain a high degree of axiality. This can effectively reduce the number of operation steps required to replace the above-mentioned whole to adapt to different types of gears, making the operation more convenient.

[0011] In the aforementioned gear machining positioning fixture, the limiting seat has an annular surface that supports the power rod upwards; a vertical arc groove runs through the limiting seat, and the arc groove and the limiting seat are coaxially arranged; the number of arc grooves and the power rod are the same, and their positions correspond one-to-one. The lower end of the power rod passes through the corresponding arc groove, and the power rod can slide circumferentially along the arc groove. A pressure cap is threaded to the lower end of the power rod, and the pressure cap is located outside the base and presses against the bottom wall of the limiting seat. The power rod can adjust its position by sliding within the arc groove, thereby more broadly adapting to different gears and further improving the practicality of the fixture.

[0012] As another option, in the gear machining positioning fixture mentioned above, the limiting seat has a vertical threaded hole 1. The number of threaded holes 1 and the position of the power rod are the same and correspond one-to-one. The lower end of each power rod is threaded into the corresponding threaded hole 1, so as to realize the detachable connection between the power rod and the limiting seat. It has the advantages of simple structure and stable operation.

[0013] In the aforementioned gear machining positioning fixture, the power rod consists of a cylinder and an externally threaded post formed on the bottom surface of the cylinder. The cylinder and the externally threaded post are coaxially arranged. The externally threaded post passes through a corresponding arc groove and connects to a corresponding pressure cap. The outer diameter of the cylinder is larger than the outer diameter of the externally threaded post. The aforementioned annular surface is the top surface of the limiting seat, and the bottom surface of the cylinder presses against the annular surface. This design facilitates design and machining.

[0014] In the aforementioned gear machining positioning fixture, a horizontal through hole is formed on the side wall of the base, and a corresponding threaded hole is provided on the outer side wall of the drive rod. A screw is installed inside the through hole, with the screw shank screwed into the threaded hole, and the screw head pressed against the outer side wall of the base. The drive rod is detachably fixed to the base by utilizing the screw, the threaded hole, and the through hole, which has the advantages of simple structure and convenient assembly and disassembly.

[0015] As another option, in the gear machining positioning fixture mentioned above, the conical surface is formed on the inner wall of the upper port of the base, and an internal thread is provided on the inner wall of the upper end of the base. An external thread that meshes with the internal thread is provided on the outer wall of the lower end of the drive rod, so as to stably realize the detachable connection between the drive rod and the base.

[0016] In the aforementioned gear machining positioning fixture, a tapered guide surface is provided on the outer surface of the upper end of the cylinder. The diameter of the guide surface gradually increases from top to bottom, and the upper side of the guide surface extends to the top surface of the cylinder. The guide surface serves as a guide, allowing the power rod to be smoothly inserted into the gear bolt hole for convenient use.

[0017] Compared with existing technologies, this gear machining positioning fixture has the following advantages: 1. The power rod and key block are detachably integrated onto the drive rod, and the drive rod is detachably fixed to the base. This allows for the matching of more different types of gears without disassembling the base, by assembling or disassembling the power rod, key block, or the whole formed by the drive rod, power rod, and key block. This effectively improves the adaptability of the fixture and makes it highly practical.

[0018] 2. When the drive rod is inserted into the base, the first conical surface will adhere to the second conical surface to directly correct the position of the drive rod, so that the drive rod and the base maintain a high degree of axiality. This can effectively reduce the number of operation steps required to replace the above-mentioned whole to adapt to different types of gears, making the operation more convenient. Attached Figure Description

[0019] Figure 1This is a three-dimensional schematic diagram of the gear machining positioning fixture.

[0020] Figure 2 This is a cross-sectional schematic diagram of the gear machining positioning fixture.

[0021] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0022] Figure 4 This is a schematic diagram showing the connection between the drive rod and the base.

[0023] In the diagram, 1. Base; 1a. Conical surface two; 1b. Mounting seat; 1c. Mounting hole; 2. Drive rod; 2a. Conical surface one; 2b. Limiting seat; 2c. Annular surface; 2d. Circular groove; 3. Key block; 4. Pressure ring; 5. Nut; 6. Gear; 6a. Bolt hole; 7. Power rod; 7a. Cylinder; 7b. External threaded post; 7c. Guide surface; 8. Screw; 9. Pressure cap. Detailed Implementation

[0024] 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.

[0025] Example 1: As Figure 1 As shown, this gear machining positioning fixture includes a cylindrical base 1 and a drive rod 2 vertically arranged inside the base 1, and the drive rod 2 and the base 1 are coaxially arranged.

[0026] in, The upper end of the drive rod 2 extends out of the base 1, and a key block 3 is detachably fixed on the upper side wall of the drive rod 2; the middle outer wall of the drive rod 2 has a tapered surface 2a whose diameter gradually decreases from top to bottom, and the tapered surface 2a and the drive rod 2 are coaxially arranged; the inner wall of the base 1 is formed with a tapered surface 1a that matches the tapered surface 2a, and the tapered surface 1a is attached to the tapered surface 2a to enhance the coaxiality of the base 1 and the drive rod 2; the lower end of the drive rod 2 is detachably fixed to the base 1.

[0027] like Figure 1 and Figure 2 As shown, the upper end of the drive rod 2 is fitted with a pressure ring 4 and a screwed nut 5. The nut 5 is positioned above the pressure ring 4 and presses against the top of the pressure ring 4. A ring-shaped limiting seat 2b is horizontally formed on the upper outer wall of the drive rod 2. The limiting seat 2b and the drive rod 2 are coaxially arranged and are an integral structure. At this time, a clamping opening for horizontally clamping the gear 6 is formed between the limiting seat 2b and the pressure ring 4, and the aforementioned key block 3 is located within the clamping opening. A power rod 7 is vertically provided on the limiting seat 2b. There are at least two power rods 7 distributed circumferentially along the base 1, and the lower end of the power rod 7 is detachably fixed to the limiting seat 2b. In the actual product, there are two power rods 7.

[0028] In use, for gear 6 with a keyway on the inner wall, remove the power rod 7, and use the key block 3 to cooperate with the keyway to form a stable circumferential fit between the drive rod 2 and gear 6, so that gear 6 can accurately follow the base 1 to rotate.

[0029] For gear 6 with a ring of vertically arranged bolt holes 6a, remove key block 3. When gear 6 is clamped between limit seat 2b and pressure plate, at least part of power rod 7 is inserted into the corresponding bolt hole 6a to form a stable circumferential fit between drive rod 2 and gear 6, so that gear 6 accurately follows the base 1.

[0030] Both the power rod 7 and the key block 3 can be detachably integrated onto the drive rod 2, and the drive rod 2 can be detachably fixed to the base 1. This allows for the matching of more different types of gears 6 without disassembling the base 1, by disassembling and assembling the power rod 7, the key block 3, or the whole formed by the drive rod 2, the power rod 7, and the key block 3. This effectively improves the adaptability of the fixture and makes it highly practical.

[0031] At the same time, when the drive rod 2 is inserted into the base 1, the first conical surface 2a will be attached to the second conical surface 1a to directly correct the position of the drive rod 2, so that the drive rod 2 and the base 1 maintain a high degree of axiality. This can effectively reduce the operation steps required to replace the above-mentioned whole to adapt to different types of gears 6, making the operation more convenient.

[0032] In this embodiment, The key block 3 is installed as follows: a strip groove matching the key block 3 is provided on the upper side wall of the drive rod 2, one side of the key block 3 is inserted into the strip groove, and the key block 3 is fixed to the drive rod 2 by horizontally set bolts.

[0033] The connection between the drive rod 2 and the base 1 is as follows: the lower outer side of the drive rod 2 contacts and engages with the inner side of the base 1, preferably through a circumferential contact. A horizontal through hole is provided on the side wall of the base 1, and a corresponding threaded hole is provided on the outer side wall of the drive rod 2. A screw 8 is installed in the through hole, and the shank of the screw 8 is screwed into the threaded hole, with the head of the screw 8 pressing against the outer side wall of the base 1. The drive rod 2 is detachably fixed to the base 1 by utilizing the screw 8, the threaded hole, and the through hole, which has the advantages of simple structure and convenient assembly and disassembly. Further, there are two through holes distributed along the axial direction of the base 1, and the number of threaded holes, the through holes, and the screw 8 are equal and their positions correspond one-to-one, to enhance the connection strength and stability between the base 1 and the drive rod 2.

[0034] like Figures 2 to 4As shown, the installation method of the power rod 7 is as follows: the outer diameter of the limiting seat 2b is larger than the upper outer diameter of the base 1; the limiting seat 2b has an annular surface 2c that supports the power rod 7 upwards; a circular arc groove 2d is vertically passed through the limiting seat 2b, and the circular arc groove 2d and the limiting seat 2b are coaxially arranged; the number of circular arc grooves 2d and the position of the power rod 7 are the same and correspond one-to-one, the lower end of the power rod 7 passes through the corresponding circular arc groove 2d, and the power rod 7 can slide along the circumference of the circular arc groove 2d; the lower end of the power rod 7 is threadedly connected to a pressure cap 9, the pressure cap 9 is located outside the base 1, and the pressure cap 9 is pressed tightly against the bottom wall of the limiting seat 2b. The power rod 7 can adjust its position by sliding in the circular arc groove 2d, thereby more widely adapting to different gears 6, and further improving the practicality of the fixture.

[0035] like Figure 2 and Figure 3 As shown, the power rod 7 is an integral structure, consisting of a cylinder 7a and an externally threaded post 7b formed on the bottom surface of the cylinder 7a, with the cylinder 7a and the externally threaded post 7b coaxially arranged. The upper outer surface of the cylinder 7a has a tapered guide surface 7c, the diameter of which gradually increases from top to bottom, and the upper side of the guide surface 7c extends to the top surface of the cylinder 7a. The guide surface 7c serves as a guide, allowing the power rod 7 to smoothly insert into the bolt hole 6a of the gear 6, facilitating use. The outer diameter of the externally threaded post 7b matches the width of the arc groove 2d. The externally threaded post 7b passes through the corresponding arc groove 2d and connects to the corresponding pressure cap 9. The outer diameter of the cylinder 7a is larger than the outer diameter of the externally threaded post 7b. The aforementioned annular surface 2c is the top surface of the limiting seat 2b, and the bottom surface of the cylinder 7a presses against the annular surface 2c. This design facilitates design and manufacturing.

[0036] In the actual product, a ring-shaped mounting seat 1b is integrally formed on the lower outer wall of the base 1, and the mounting seat 1b and the base 1 are coaxially arranged. A ring of mounting holes 1c runs vertically through the mounting seat 1b, and the ring of mounting holes 1c is evenly distributed around the circumference of the base 1.

[0037] Example 2: The structure and principle of Example 2 are basically the same as those of Example 1. The difference is that a threaded hole is vertically penetrating the limiting seat 2b. The number of threaded holes and the number of power rods 7 are the same and their positions correspond one-to-one. The lower end of each power rod 7 is threaded into the corresponding threaded hole, so as to realize the detachable connection between the power rod 7 and the limiting seat 2b. It has the advantages of simple structure and stable operation.

[0038] Example 3: The structure and principle of Example 3 are basically the same as those of Example 1. The difference is that the conical surface 1a is formed on the inner wall of the upper port of the base 1. The inner wall of the upper end of the base 1 is also provided with an internal thread. The outer wall of the lower end of the drive rod 2 is provided with an external thread that meshes with the internal thread, so as to stably realize the detachable connection between the drive rod 2 and the base 1.

[0039] 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 gear machining positioning fixture, comprising a cylindrical base (1) and a drive rod (2) vertically disposed within the base (1), the upper end of the drive rod (2) extending out of the base (1), and a key block (3) detachably fixed to the upper side wall of the drive rod (2), a pressure ring (4) sleeved on the upper end of the drive rod (2) and a nut (5) screwed onto it, the nut (5) pressing against the top of the pressure ring (4), characterized in that, The lower end of the drive rod (2) is detachably fixed to the base (1); the middle outer wall of the drive rod (2) has a tapered surface (2a) whose diameter gradually decreases from top to bottom; the inner wall of the base (1) is formed with a tapered surface (1a) that matches the tapered surface (2a), and the tapered surface (1a) is attached to the tapered surface (2a); the upper outer wall of the drive rod (2) is also horizontally formed with a ring-shaped limiting seat (2b), and a clamping port for horizontally clamping the gear (6) is formed between the limiting seat (2b) and the pressure ring (4); the key block (3) is located in the clamping port; the limiting seat (2b) is vertically provided with a power rod (7), there are at least two power rods (7) and they are distributed around the base (1), and the lower end of the power rod (7) is detachably fixed to the limiting seat (2b).

2. The gear machining positioning fixture according to claim 1, characterized in that, The limiting seat (2b) has an annular surface (2c) that supports the power rod (7) upward; the limiting seat (2b) has a vertically penetrating arc groove (2d), and the arc groove (2d) and the limiting seat (2b) are coaxially arranged; the number of arc grooves (2d) and the power rod (7) are the same and their positions correspond one-to-one, the lower end of the power rod (7) passes through the corresponding arc groove (2d), and the power rod (7) can slide along the circumference of the arc groove (2d), the lower end of the power rod (7) is threaded with a pressure cap (9), the pressure cap (9) is located outside the base (1), and the pressure cap (9) is pressed against the bottom wall of the limiting seat (2b).

3. The gear machining positioning fixture according to claim 1, characterized in that, The limit seat (2b) has a threaded hole through it vertically. The number of threaded holes is the same as that of the power rod (7) and their positions correspond one to one. The lower end of each power rod (7) is threaded into the corresponding threaded hole.

4. The gear machining positioning fixture according to claim 2, characterized in that, The power rod (7) is composed of a cylinder (7a) and an external threaded post (7b) formed on the bottom surface of the cylinder (7a). The cylinder (7a) and the external threaded post (7b) are coaxially arranged. The external threaded post (7b) passes through the corresponding arc groove (2d) and is connected to the corresponding pressure cap (9). The outer diameter of the cylinder (7a) is larger than the outer diameter of the external threaded post (7b). The above-mentioned annular surface (2c) is the top surface of the limiting seat (2b), and the bottom surface of the cylinder (7a) presses on the annular surface (2c).

5. The gear machining positioning fixture according to claim 1, characterized in that, A through hole is horizontally penetrating the side wall of the base (1), and a threaded hole is provided on the outer side wall of the drive rod (2). A screw (8) is provided in the through hole, and the shank of the screw (8) is screwed into the threaded hole. The head of the screw (8) is pressed against the outer side wall of the base (1).

6. The gear machining positioning fixture according to claim 1, characterized in that, The aforementioned conical surface 2 (1a) is formed on the inner wall of the upper port of the base (1). The inner wall of the upper end of the base (1) is also provided with an internal thread, and the outer wall of the lower end of the drive rod (2) is provided with an external thread that meshes with the internal thread.

7. The gear machining positioning fixture according to claim 4, characterized in that, The upper outer surface of the cylinder (7a) is provided with a conical guide surface (7c). The diameter of the guide surface (7c) gradually increases from top to bottom, and the upper side of the guide surface (7c) extends to the top surface of the cylinder (7a).

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