Lower die structure of gear positioning clamp

Abstract

The utility model provides a lower die structure of a gear positioning clamp, and belongs to the technical field of machinery. The problem that an existing clamp affects the machining quality is solved. The lower die structure of the gear positioning clamp comprises a base, a center hole vertically penetrates through the base, a positioning rod is vertically arranged in the center hole in a sliding mode, the upper end of the positioning rod extends out of the center hole, a spring enabling the positioning rod to have the upward moving tendency is arranged in the center hole, a guide rod is coaxially fixed to the upper end of the positioning rod, and a circle of protruding block is formed on the top face of the positioning rod. The protruding block is in a circular arc shape coaxial with the positioning rod. The side, close to the guide rod, of each protruding block is a positioning part matched with a gear tooth groove in shape and size, the other side of at least one protruding block is connected with the base in an up-down sliding mode through a connecting structure, and under the action of the connecting structure, the positioning rod is limited in the circumferential direction. The lower die structure of the gear positioning clamp can improve the gear machining quality.

Description

Technical Field

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

[0002] Gear positioning fixtures are important tools used in machining processes to clamp, fix, and position gears.

[0003] Existing fixtures, such as the positioning fixture for pressing in the manufacturing process of a miniature double gear disclosed in the Chinese Patent Database (application number: 201921692760.8), include a press head, a first fixed seat, a second fixed seat, and a double gear. The first fixed seat is inserted into the second fixed seat, and the first fixed seat has a cavity. A spring is fixedly connected to the bottom of the cavity, and a movable shaft is fixedly connected to the upper end of the spring. The double gear is sleeved on the movable shaft, and the press head is located directly above the movable shaft.

[0004] The aforementioned positioning fixture does not have a limiting structure to restrict the rotation of the gear in the circumferential direction, which causes the gear to rotate in the circumferential direction when subjected to a large force, affecting the gear machining quality and accuracy. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a stable gear positioning fixture lower mold structure.

[0006] The objective of this utility model can be achieved through the following technical solution: a gear positioning fixture lower mold structure, including a base, a central hole vertically penetrating the base, a positioning rod vertically slidably disposed within the central hole, the upper end of the positioning rod extending out of the central hole, a spring provided within the central hole to give the positioning rod an upward tendency, a guide rod coaxially fixed to the upper end of the positioning rod, characterized in that a ring of protrusions is formed on the top surface of the positioning rod, and the protrusions are in the shape of an arc coaxial with the positioning rod; the side of the protrusions near the guide rod is a positioning part whose shape and size match the gear tooth groove, and the other side of at least one protrusion is slidably connected to the base vertically through a connecting structure, and the positioning rod is circumferentially limited under the action of the connecting structure.

[0007] In use, the gear is horizontally fitted into the positioning rod, at which point the positioning part is inserted into the corresponding gear tooth groove to stably limit the gear in the circumferential direction.

[0008] The connection structure, along with the engagement of the protrusions and gear teeth, creates a stable and reliable circumferential fit between the gear and the base, thereby stabilizing and limiting the gear's position, effectively preventing rotation during gear processing, and ensuring the quality and precision of gear processing.

[0009] In the aforementioned gear positioning fixture lower mold structure, an annular boss is formed on the top surface of the positioning rod. The annular boss surrounds the guide rod, and its top surface is flat. The annular boss is designed to create multiple gear support positions on the positioning rod, accommodating gears of different inner diameters, thus offering good practicality.

[0010] In the aforementioned gear positioning fixture lower mold structure, the connecting structure includes a support block fixed to the base, with the support block positioned on one side of the corresponding protrusion. A guide block is vertically formed on the side of the support block closest to the corresponding protrusion, and a guide groove matching the guide block is provided on the protrusion. The guide groove is vertically through-hole, and the guide block is inserted into the guide groove. The cooperation of the guide block and guide groove enables a stable sliding connection and circumferential limiting between the positioning rod and the base, offering advantages such as simple structure and stable operation.

[0011] As an alternative, in the aforementioned gear positioning fixture lower mold structure, the connecting structure includes a guide rod vertically fixed to the corresponding protrusion, and a corresponding vertically penetrating guide hole on the base that matches the guide rod, with the lower end of the guide rod inserted into the guide hole. Using this design, a stable sliding connection and circumferential limiting can also be achieved between the positioning rod and the base.

[0012] In the gear positioning fixture lower mold structure described above, the upper outer wall of the positioning rod has an annular shoulder coaxial with the positioning rod, and the two ends of the spring act on the bottom surface of the annular shoulder and the inner wall of the central hole, respectively.

[0013] In the gear positioning fixture lower mold structure described above, the protrusion is set on the annular shoulder, which acts like a reinforcing rib, effectively strengthening the structural strength of the annular shoulder and ensuring more stable operation of the lower mold.

[0014] In the gear positioning fixture lower mold structure described above, a limiting block is horizontally provided below the base. The limiting block is fixed to the positioning rod by screws, and under the action of the spring, the limiting block has the tendency to move upward and press against the bottom surface of the base, which is used to limit the upward movement distance of the positioning rod and prevent the positioning rod from coming out.

[0015] Compared with existing technologies, the lower mold structure of this gear positioning fixture has the following advantages:

[0016] 1. The connection structure and the cooperation between the protrusion and the gear tooth groove make the gear and the base form a stable and reliable circumferential fit, thereby stably limiting the gear and effectively preventing the gear from rotating during processing, ensuring the quality and accuracy of gear processing.

[0017] 2. The protrusions are set on the annular shoulder, which acts like a reinforcing rib, effectively strengthening the structural strength of the annular shoulder and ensuring more stable operation of the lower mold. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the lower mold structure of this gear positioning fixture.

[0019] Figure 2 This is a cross-sectional schematic diagram of the lower mold structure of this gear positioning fixture.

[0020] In the figure, 1 is the base; 1a is the center hole; 2 is the positioning rod; 2a is the protrusion; 2b is the positioning part; 2c is the annular boss; 2d is the annular shoulder; 3 is the spring; 4 is the guide rod; 5 is the support block; 5a is the guide block; and 6 is the limit block. 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. Example 1

[0022] like Figure 1 As shown, the lower mold structure of this gear positioning fixture includes a base 1, and a central hole 1a is vertically penetrating the base 1. In the actual product, the base 1 is provided with a ring of vertically penetrating bolt holes, which are evenly distributed around the central hole 1a to stably position the base 1.

[0023] Specifically

[0024] A positioning rod 2 is vertically slidably installed inside the central hole 1a, with its upper end extending out of the central hole 1a. In the actual product, the outer wall of the lower end of the positioning rod 2 contacts the inner wall of the central hole 1a to enhance the stability of the sliding of the positioning rod 2. A spring 3 is provided inside the central hole 1a to give the positioning rod 2 an upward tendency. A guide rod 4 is coaxially fixed to the upper end of the positioning rod 2, and the top surface of the guide rod 4 is higher than that of the positioning rod 2.

[0025] like Figure 1 and Figure 2 As shown, a ring of protrusions 2a is formed on the top surface of the positioning rod 2. These protrusions 2a are evenly distributed around the circumference of the positioning rod 2, and are coaxial with the positioning rod 2 in an arc shape. The side of the protrusion 2a closest to the guide rod 4 is a positioning part 2b, whose shape and size match the gear teeth. At this point, the positioning part 2b is also coaxial with the positioning rod 2 in an arc shape. The other side of at least one protrusion 2a is slidably connected to the base 1 via a connecting structure, and the positioning rod 2 is circumferentially limited by the connecting structure. In the actual product, two protrusions 2a are connected to the base 1 via the connecting structure.

[0026] When in use, the gear is horizontally fitted into the positioning rod 2, at which point the positioning part 2b is inserted into the corresponding gear tooth groove to stably limit the gear in the circumferential direction.

[0027] With the connection structure and the cooperation between the protrusion 2a and the gear tooth groove, a stable and reliable circumferential fit is formed between the gear and the base 1, thereby stably limiting the gear and effectively preventing the gear from rotating during processing, ensuring the quality and accuracy of gear processing.

[0028] To further explain, an annular boss 2c is formed on the top surface of the positioning rod 2, and the annular boss 2c is coaxially arranged with the base 1. The annular boss 2c is fitted over the guide rod 4, and the top surface of the annular boss 2c is flat. The annular boss 2c is provided to form multiple gear support positions on the positioning rod 2 to accommodate gears with different inner diameters, thus improving practicality.

[0029] In this embodiment,

[0030] The connecting structure includes a support block 5 fixed to the base 1, with the support block 5 positioned on one side of the corresponding protrusion 2a. A guide block 5a is vertically formed on the side of the support block 5 closest to the corresponding protrusion 2a. A guide groove matching the guide block 5a is provided on the protrusion 2a, and the guide groove is vertically through-hole, with the guide block 5a inserted into it. The cooperation of the guide block 5a and the guide groove enables a stable sliding connection and circumferential limiting between the positioning rod 2 and the base 1, offering advantages such as simple structure and stable operation.

[0031] The guide rod 4 is installed as follows: a matching insertion hole is vertically opened on the top surface of the positioning rod 2, and the lower end of the guide rod 4 is locked in the insertion hole.

[0032] like Figure 2 As shown, the upper outer wall of the positioning rod 2 has an annular shoulder 2d coaxial with the positioning rod 2. The two ends of the spring 3 act on the bottom surface of the annular shoulder 2d and the inner wall of the central hole 1a, respectively. To further explain, the protrusion 2a is set on the annular shoulder 2d, which plays a similar role to a reinforcing rib, effectively strengthening the structural strength of the annular shoulder 2d and ensuring that the lower mold runs more stably.

[0033] In the actual product, a limiting block 6 is horizontally provided below the base 1. The limiting block 6 is fixed to the positioning rod 2 by screws. Under the action of the spring 3, the limiting block 6 has the tendency to move upward and press against the bottom surface of the base 1, which is used to limit the upward movement distance of the positioning rod 2 and prevent the positioning rod 2 from coming out. Example 2

[0034] The structure and principle of this embodiment are basically the same as those of embodiment one, except that the connecting structure includes a guide rod vertically fixed on the corresponding protrusion 2a, and a guide hole that matches the guide rod is vertically inserted through the base 1, with the lower end of the guide rod inserted into the guide hole. Using this design, a stable sliding connection and circumferential limiting can also be achieved between the positioning rod 2 and the base 1.

[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 replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A gear positioning fixture lower mold structure, comprising a base (1), a central hole (1a) vertically penetrating the base (1), a positioning rod (2) vertically slidably disposed within the central hole (1a), the upper end of the positioning rod (2) extending out of the central hole (1a), a spring (3) provided within the central hole (1a) to give the positioning rod (2) an upward moving tendency, and a guide rod (4) coaxially fixed to the upper end of the positioning rod (2), characterized in that, A ring of protrusions (2a) is formed on the top surface of the positioning rod (2), and the protrusions (2a) are in the shape of an arc coaxial with the positioning rod (2). The side of the protrusions (2a) near the guide rod (4) is a positioning part (2b) whose shape and size match the gear tooth groove. The other side of at least one protrusion (2a) is slidably connected to the base (1) through a connecting structure, and the positioning rod (2) is circumferentially limited under the action of the connecting structure.

2. The gear positioning fixture lower mold structure according to claim 1, characterized in that, The top surface of the positioning rod (2) is formed with an annular boss (2c), which is sleeved on the guide rod (4), and the top surface of the annular boss (2c) is a plane.

3. The gear positioning fixture lower mold structure according to claim 1 or 2, characterized in that, The connecting structure includes a support block (5) fixed on the base (1), and the support block (5) is located on one side of the corresponding protrusion (2a); a guide block (5a) is vertically formed on the side of the support block (5) close to the corresponding protrusion (2a), and a guide groove matching the guide block (5a) is provided on the protrusion (2a), the guide groove is vertically through, and the guide block (5a) is inserted into the guide groove.

4. The gear positioning fixture lower mold structure according to claim 1 or 2, characterized in that, The connecting structure includes a guide rod that is vertically fixed on the corresponding protrusion (2a), and a guide hole that matches the guide rod is vertically penetrating the base (1), with the lower end of the guide rod inserted into the guide hole.

5. The gear positioning fixture lower mold structure according to claim 1, characterized in that, The upper outer wall of the positioning rod (2) has an annular shoulder (2d) coaxial with the positioning rod (2), and the two ends of the spring (3) act on the bottom surface of the annular shoulder (2d) and the inner wall of the central hole (1a) respectively.

6. The gear positioning fixture lower mold structure according to claim 5, characterized in that, The aforementioned protrusion (2a) is disposed on the annular shoulder (2d).

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