Plastic gear hole keyway processing device

Abstract

The application belongs to the technical field of plastic gear processing equipment, and particularly relates to a plastic gear inner hole key groove processing device, which comprises a positioning plate, a plurality of circumferential positioning members are arranged on the positioning plate, the circumferential positioning members comprise a plurality of positioning pins arranged on the positioning plate, the plurality of positioning pins are arranged in a circumferential distribution mode, the positioning pins are inserted into tooth grooves of a gear to be processed, and a chip removal groove is arranged between the plurality of positioning pins. The application has the effects of guaranteeing gear processing yield and reducing deformation.

Description

Technical Field

[0001] This application relates to the technical field of plastic gear processing equipment, and in particular to a device for processing keyways in the inner bore of plastic gears. Background Technology

[0002] Plastic gears are transmission components manufactured from engineering plastics (such as POM and nylon) through injection molding. Their core advantages lie in their light weight, low cost, self-lubrication, corrosion resistance, and low operating noise, meeting the demands for quiet operation, oil-free lubrication, and mass production under light load conditions. However, they also have disadvantages such as lower strength and temperature resistance, and generally cannot replace metal gears in harsh environments such as heavy loads and high temperatures. Currently, plastic gears are widely used in many fields, including automotive electrical systems (such as window regulators), home appliances, office equipment (such as printers), and toys, serving as key components for achieving lightweight, low-cost, and quiet product designs.

[0003] like Figure 1 The plastic gears currently manufactured by our company require keyway cutting on their inner rings after the outer gears are machined for subsequent connection with the drive shaft. However, during the actual cutting process, it was found that the material properties of the plastic gears prevent them from being positioned using the same positioning devices as conventional metal gears, such as three-jaw chucks, which would cause deformation of the outer ring teeth. Magnetic positioning devices are also unable to secure them. Therefore, a keyway machining device for the inner hole of plastic gears is urgently needed. Utility Model Content

[0004] To solve the above-mentioned technical problems, this application provides a plastic gear inner hole keyway processing device, which has the advantages of ensuring gear processing yield and reducing gear deformation.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A device for machining keyways in the inner bore of plastic gears includes a positioning plate, wherein a circumferential positioning element is provided on the positioning plate; The circumferential positioning component includes a plurality of positioning pins disposed on the positioning plate. The plurality of positioning pins are evenly distributed around the circumference and are inserted into the tooth grooves of the gear to be processed. Chip removal grooves are provided between several of the positioning pins.

[0006] To achieve the above technical solution, the gear is placed horizontally on the positioning plate for end face positioning, and then positioned horizontally in the circumferential direction by circumferential positioning components. After several positioning pins are evenly distributed and fixed on the positioning plate along the circumference, the gear is inserted into several positioning pins. The positioning pins are inserted one by one into the tooth groove of the gear, thereby completing the horizontal positioning effect of the gear and preventing the gear from rotating horizontally. This ensures that the gear positioning is not subject to external pressure. During the fixing process, the gear is positioned by multiple positioning pins at the same time. That is, when subjected to circumferential force, it can be distributed on each positioning pin simultaneously, thereby preventing stress concentration and gear deformation. The cut waste can fall into the chip removal groove to reduce the impact of cutting waste on subsequent cutting.

[0007] As a preferred embodiment of this application, the positioning plate is provided with insertion holes for each positioning pin.

[0008] The above technical solution allows the positioning pin to be detachably inserted into the positioning hole. When the positioning pin is damaged, it can be replaced to ensure the positioning effect.

[0009] As a preferred embodiment of this application, a positioning block is provided inside the insertion hole, and an inverted "L"-shaped locking groove for the positioning block to be inserted is provided on the side wall of the positioning pin.

[0010] To achieve the above technical solution, when the positioning pin is inserted into the positioning hole, the positioning block will first be inserted into the vertical section of the locking groove, and then the positioning pin will be rotated so that the positioning block enters the horizontal section of the locking groove, thereby completing the fixation of the positioning pin and ensuring the stability of the positioning pin.

[0011] As a preferred embodiment of this application, a spring is provided between the positioning pin and the positioning hole.

[0012] To achieve the above technical solution, after the positioning pin is disengaged from the positioning block, the positioning pin is lifted up by the action of the spring, which makes it easier for personnel to pick up and put down the positioning pin.

[0013] In summary, this application includes at least one of the following beneficial technical effects: 1. The gear is placed horizontally on the positioning plate for end face positioning. Then, the gear is positioned horizontally in the circumferential direction using circumferential positioning components. Several positioning pins are evenly distributed and fixed on the positioning plate along the circumference. At this time, the gear is inserted into several positioning pins, and the positioning pins are inserted into the tooth grooves of the gear, thereby completing the horizontal positioning effect of the gear. At the same time, it can prevent the gear from rotating horizontally, so that the positioning of the gear will not be squeezed by external forces. During the fixing process, the gear is positioned by multiple positioning pins at the same time. That is, when subjected to circumferential force, it can be distributed on each positioning pin at the same time, thereby preventing stress concentration and gear deformation. The cutting waste can fall into the chip removal groove to reduce the impact of cutting waste on subsequent cutting. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0016] Figure 2 This is a top view of an embodiment of this application.

[0017] Figure 3 This is a cross-sectional view of an embodiment of this application.

[0018] Reference numerals in the attached diagram: 1. Positioning plate; 2. Positioning pin; 3. Chip removal groove; 4. Locking groove; 5. Positioning block; 6. Spring. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0020] This application discloses an apparatus for machining the keyway in the inner hole of a plastic gear. (Refer to...) Figure 1 The plastic gear inner hole keyway processing device includes a positioning plate 1, on which a circumferential positioning component is provided. The gear is placed horizontally on the positioning plate 1 for end face positioning, and then the circumferential positioning component is used to position the gear horizontally in the circumferential direction.

[0021] The circumferential positioning component includes several positioning pins 2 arranged evenly around the circumference of the positioning plate 1. The positioning pins 2 are inserted into the tooth grooves of the gear to be processed. That is, after the positioning pins 2 are evenly distributed and fixed on the positioning plate 1, the gear is inserted into the positioning pins 2, with each positioning pin 2 inserted into the tooth groove of the gear. This achieves the horizontal positioning effect of the gear and prevents horizontal rotation, thus preventing the gear from being squeezed by external forces. Furthermore, during the fixing process, the gear is simultaneously positioned by multiple positioning pins 2, meaning that when subjected to circumferential force, the force is distributed simultaneously across all positioning pins 2, preventing stress concentration that could lead to gear deformation.

[0022] In order to prevent the cutting waste generated during the cutting process from affecting subsequent cutting, a chip removal groove 3 is provided between several positioning pins 2 so that the cutting waste can fall into the chip removal groove 3.

[0023] During use, the positioning pin 2 may deform due to prolonged use and impact, thus failing to meet the positioning requirements of the gear. Therefore, the positioning plate 1 is provided with corresponding insertion holes for the positioning pin 2, allowing the positioning pin 2 to be detachably inserted into the positioning hole. When the positioning pin 2 is damaged, it can be replaced to ensure the positioning effect.

[0024] To prevent the positioning pin 2 from falling out during construction, a positioning block 5 is installed inside the insertion hole. The side wall of the positioning pin 2 has an inverted "L"-shaped locking groove 4 for the positioning block 5 to insert into. When the positioning pin 2 is inserted into the positioning hole, the positioning block 5 first inserts into the vertical section of the locking groove 4, and then the positioning pin 2 is rotated, causing the positioning block 5 to enter the horizontal section of the locking groove 4, thus fixing the positioning pin 2 and ensuring its stability. After replacement, a spring 6 is installed between the positioning pin 2 and the positioning hole to facilitate replacement. When the positioning pin 2 is disengaged from the positioning block 5, the positioning pin 2 is lifted by the spring 6, making it easy for personnel to remove and place the positioning pin 2.

[0025] The implementation principle of the plastic gear inner hole keyway processing device in this application embodiment is as follows: The gear is placed horizontally on the positioning plate 1 for end face positioning, and then positioned horizontally circumferentially by circumferential positioning components. Several positioning pins 2 are evenly distributed and fixed on the positioning plate 1 along the circumference. The gear is then inserted into these positioning pins 2, which are inserted one by one into the gear tooth groove, thus achieving horizontal positioning of the gear and preventing horizontal rotation. This prevents the gear from being squeezed by external forces. During the fixing process, the gear is simultaneously positioned by multiple positioning pins 2, meaning that when subjected to circumferential force, the force is distributed simultaneously across all positioning pins 2, preventing stress concentration and gear deformation. The cut waste material falls into the chip removal groove 3, reducing its impact on subsequent cutting. When a positioning pin 2 is damaged, it can be replaced to maintain the positioning effect.

[0026] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for machining keyways in the inner bore of plastic gears, characterized in that: It includes a positioning plate (1), on which a plurality of circumferential positioning components are provided; The circumferential positioning component includes a plurality of positioning pins (2) disposed on the positioning plate (1), the plurality of positioning pins (2) being evenly distributed around the circumference, and the positioning pins (2) being inserted into the tooth grooves of the gear to be processed; Chip removal grooves (3) are provided between several of the positioning pins (2).

2. The plastic gear inner hole keyway processing device according to claim 1, characterized in that: The positioning plate (1) is provided with insertion holes for the positioning pins (2) to be inserted one by one.

3. The plastic gear inner hole keyway processing device according to claim 2, characterized in that: A positioning block (5) is provided inside the insertion hole, and an inverted "L"-shaped locking groove (4) is provided on the side wall of the positioning pin (2) for the positioning block (5) to be inserted.

4. The plastic gear inner hole keyway processing device according to claim 1, characterized in that: A spring (6) is provided between the positioning pin (2) and the positioning hole.

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