A tooling system for disassembling interference or tapered fit gears

Abstract

The utility model belongs to gear dismounting technical field provides a kind of tooling system for dismounting interference or taper fit gear, at least two dismounting interfaces are provided on the gear end face, tooling system includes: dismounting tool, it is provided with at least two mounting holes, and it is provided with stepped hole along the axial direction, when connecting through fastener across mounting hole and dismounting interface, dismounting tool is coaxially fixed on gear;Top rod screw, it is rotatably installed in stepped hole, when rotating top rod screw, dismounting tool front end is tightly in the long shaft end portion matched with gear, gear is moved axially and separates relative to long shaft by reaction force.

Description

Technical Field

[0001] This application relates to the field of gear disassembly technology, and in particular to a tooling system for disassembling interference or tapered gears. Background Technology

[0002] In the 416 and 45 packaging machines, the push rod transmission of the second (or fifth) wheel is a key mechanism. This mechanism is powered by a cam within the main power gearbox, which drives a long gear shaft in reciprocating rotation. The gear at the front end of the long shaft meshes with a rack, converting the rotational motion into the linear reciprocating movement of the rack, ultimately achieving the left-right pushing and picking action of the push rod. To ensure transmission accuracy and meet the requirements of high-speed operation, a high-precision transition fit (hole-basis system) is used between the gear at the shaft end and the long shaft, with extremely small tolerances. The gear is circumferentially fixed to the end of the long shaft via a flat key to transmit torque, while a nut is used to lock the shaft end to prevent axial movement.

[0003] However, this high-precision, tight fit presents a significant challenge to gear disassembly during maintenance and repair. Due to the extremely limited installation space, traditional disassembly methods have numerous drawbacks: they typically use pry bars to forcibly pry the gear edges or use tools like needle-nose pliers to grip the gear's exterior and pull it out. These methods essentially apply one or more lateral or eccentric forces to the gear's exterior (such as the teeth or end face), attempting to "pry" the gear out. Because the contact between the tool and the gear is unreliable point or line contact, the enormous force transmitted through a few vulnerable points generates extremely high pressure, easily causing indentations, scratches, or even deformation of the gear surface, damaging the precision mating surfaces. During this rough prying process, the gear is prone to accidental rotation, subjecting the torque-transmitting key to enormous shear forces, potentially causing the key, shaft, or keyway on the gear to crack and break. This not only increases the complexity and cost of repair but may also cause secondary damage due to the lack of protection for critical components.

[0004] Therefore, this traditional disassembly method is not only inefficient, but also prone to causing gear tilting and jamming due to uneven force, which poses a serious threat to gears, long shafts and flat keys, making it a high-risk operation. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a tooling system for disassembling interference or tapered gears, which can save disassembly and assembly time, improve maintenance efficiency, and reduce damage to parts.

[0006] To achieve the above and related objectives, this utility model provides a tooling system for disassembling interference-fit or tapered gears, wherein at least two disassembly interfaces are provided on the gear end face, and the tooling system includes:

[0007] The disassembly fixture is provided with at least two mounting holes and a stepped hole along the axial direction. When the fastener passes through the mounting holes and is connected to the disassembly interface, the disassembly fixture is coaxially fixed on the gear.

[0008] The push rod screw is rotatably mounted in the stepped hole. When the push rod screw is rotated, the front end of the disassembly tool presses against the end of the long shaft that mates with the gear. The reaction force causes the gear to move axially relative to the long shaft and separate.

[0009] Furthermore, the stepped hole includes a first hole section, a second hole section, and a third hole section that are sequentially connected from the gear connection end to the push rod screw operating end, with their diameters decreasing sequentially.

[0010] Furthermore, the first hole is a centering hole used to mate with the end face of the gear. When the disassembly fixture is installed on the gear, the first hole makes the disassembly fixture coaxial with the central shaft of the gear.

[0011] Furthermore, the second hole section is a clearance hole, which together with the first hole section forms a cavity. When the disassembly fixture is installed on the gear end face, the cavity is used to accommodate and radially and axially avoid the long shaft end extending from the gear.

[0012] Furthermore, a radial through hole is provided on the side wall of the disassembly fixture, and the through hole communicates with the second hole segment.

[0013] Furthermore, the tooling system also includes a positioning rod for circumferential positioning of the gear through a through hole.

[0014] Furthermore, the third hole is an internally threaded hole, used to engage with the push rod screw.

[0015] Furthermore, one end of the push rod screw is a threaded section that engages with the disassembly tool, and the other end is a ball head structure for contacting the center hole of the long shaft end face.

[0016] Furthermore, the fastener is a long screw.

[0017] Furthermore, the disassembly interface has a threaded structure.

[0018] The beneficial technical effects of this utility model are as follows:

[0019] This utility model is based on the disassembly operation of the No. 2 wheel push rod transmission gear of the 416 packaging machine and the No. 5 wheel push rod transmission gear of the 45 packaging machine. It is applicable to all disc and shaft assembly parts, and the fit requirements are interference or tapered fit for light and small parts.

[0020] This invention conveniently separates the transmission gear of the second wheel push rod from the long shaft while ensuring that other parts are not damaged. During installation and disassembly of the fixture, fasteners are used to connect with the gear. The stepped holes allow for quick connection and good alignment. Furthermore, the through-holes combined with the push rod screws facilitate the conversion of the helical rotation into linear movement between the gear and the long shaft.

[0021] This invention establishes favorable conditions for rapid maintenance during the production process and has the potential for widespread application. This invention is a general-purpose processing equipment that can meet production requirements, enabling both small-batch and large-scale production; furthermore, the processing price and cost of easily damaged parts are low and controllable. Attached Figure Description

[0022] The accompanying drawings, incorporated in and forming part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. In the drawings:

[0023] Figure 1 This is a schematic diagram of the gear structure of this application;

[0024] Figure 2 This is a top view of the disassembly tooling used in this application;

[0025] Figure 3 This is a partial sectional view of the disassembly tooling used in this application;

[0026] Figure 4 This is a schematic diagram of the push rod screw structure of this application;

[0027] Figure 5 This is a schematic diagram of the threaded section of the push rod screw in this application.

[0028] Figure Labels

[0029] 1: Gear; 11: Disassembly interface; 2: Disassembly fixture; 21: Mounting hole; 22: First hole section; 23: Second hole section; 24: Third hole section; 25: Through hole; 3: Push rod screw; 31: Threaded section; 32: Ball head structure. Detailed Implementation

[0030] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be understood that certain features of this invention (described in the context of separate embodiments for clarity) may also be provided in combination in a single embodiment. Conversely, multiple features of this invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or, where appropriate, in any other described embodiment of this invention. Certain features described in the context of various embodiments will not be considered essential features of those embodiments unless the embodiment is inoperable without those elements. The present invention is further illustrated below by specific examples; however, it should be noted that the specific process conditions and results described in the embodiments of this invention are for illustrative purposes only and should not be construed as limiting the scope of protection of this invention. All equivalent changes or modifications made in accordance with the spirit and essence of this invention should be covered within the scope of protection of this invention.

[0031] This utility model provides a tooling system for disassembling interference or tapered gears. The gear 1 has at least two disassembly interfaces 11 on its end face. The tooling system includes: a disassembly tool 2, which has at least two mounting holes 21 and a stepped hole along the axial direction. When a fastener passes through the mounting hole 21 and is connected to the disassembly interface 11, the disassembly tool 2 is coaxially fixed on the gear 1; and a push rod screw 3, which is rotatably installed in the stepped hole. When the push rod screw 3 is rotated, the front end of the disassembly tool 2 presses against the end of the long shaft that mates with the gear 1, and the reaction force causes the gear 1 to move axially relative to the long shaft and separate.

[0032] like Figure 1 As shown, to address the problem of safely and efficiently disassembling a high-precision interference or tapered gear 1 in a confined space, this application first improves the gear 1 body by adding two disassembly interfaces 11 at appropriate positions on the end face of the gear 1 to be disassembled. These disassembly interfaces 11 can be M4 threaded holes. This application provides a reliable connection base for the subsequent installation and disassembly fixture 2 through the disassembly interfaces 11.

[0033] Furthermore, the fasteners in this application are long screws, such as M4 long screws. This application uses two M4 long screws, which pass through the mounting holes 21 on the disassembly fixture 2 and are screwed into the two pre-machined M4 screw holes on the end face of the gear 1, so as to firmly install the disassembly fixture 2 on the end face of the gear 1.

[0034] Furthermore, such as Figure 2 As shown, the stepped hole of this application includes a first hole section 22, a second hole section 23 and a third hole section 24 that are connected sequentially from the connecting end of the gear 1 to the operating end of the push rod screw 3, and their diameters decrease sequentially.

[0035] Furthermore, the first hole section 22 is a centering hole used to mate with the end face of the gear 1. When the disassembly fixture 2 is installed on the gear 1, the first hole section 22 makes the disassembly fixture 2 coaxial with the central shaft of the gear 1. This coaxial structure can ensure that the force is evenly distributed during the disassembly process and avoid skew and jamming.

[0036] Furthermore, the second hole segment 23 is a clearance hole, which together with the first hole segment 22 forms a cavity. When the disassembly fixture 2 is installed on the end face of the gear 1, the cavity is used to accommodate and radially and axially avoid the long shaft end extending from the gear 1. At the same time, the inner wall of the end of the second hole segment 23 can be limited to the end face of the gear 1.

[0037] Furthermore, such as Figure 3 As shown, a radial through hole 25 is provided on the side wall of the disassembly fixture 2, and the through hole 25 communicates with the second hole section 23. The fixture system also includes a positioning rod for circumferentially positioning the gear 1 by passing through the through hole 25. In this application, the positioning rod can be a slender rod with a diameter of 5mm, which, after passing through the through hole 25, engages with a flat key located between the gear 1 and the long shaft to prevent the gear 1 from rotating during disassembly.

[0038] Furthermore, such as Figure 2 As shown, the third hole section 24 is an internally threaded hole, used to engage with the push rod screw 3.

[0039] Furthermore, such as Figure 4 and Figure 5 As shown, one end of the push rod screw 3 in this application is a threaded section 31 that engages with the disassembly fixture 2, and the other end is a ball head structure 32 for contacting the center hole of the long shaft end face. One end of the push rod screw 3 in this application has a standard M6 thread for screwing into the fixture, and the other end is a ball head structure 32. The ball head design allows it to make good contact with the center hole of the long shaft end, converting the rotational torque into axial pushing force. At the same time, the spherical contact can adapt to the angle, preventing indentation damage to the long shaft end face.

[0040] Furthermore, based on the law of action and reaction, this application utilizes the helical transmission of the push rod screw 3 to convert rotational motion into linear motion, achieving smooth disassembly of gear 1. Specifically, by rotating the push rod screw 3, the ball head structure 32 abuts against the center hole on the end face of the long shaft, generating a forward pushing force. Since the disassembly fixture 2 is firmly fixed to gear 1 by two M4 screws, the forward pushing force of the push rod screw 3 on the long shaft will, in turn, generate a backward pulling force of equal magnitude and opposite direction on the disassembly fixture 2 and gear 1. Because the long shaft is fixed by the equipment housing and cannot move, the rotational motion of the push rod screw 3 is ultimately converted into a smooth backward movement of gear 1 along the axial direction of the long shaft, together with the disassembly fixture 2, thereby achieving the separation of gear 1 from the long shaft. More specifically, during disassembly, this application uses a positioning rod that passes through the through hole 25 on the side of the disassembly fixture 2 and engages in the gap of the flat key between the gear 1 and the long shaft. This prevents the gear 1 and the disassembly fixture 2 from rotating relative to the long shaft during disassembly, ensuring that the force acts only axially. It also prevents the flat key from being damaged by lateral forces during disassembly. Furthermore, under the action of the first hole section 22, this application can ensure the alignment of the entire backward pulling process, avoiding damage to the gear 1 or shaft due to misalignment.

[0041] Furthermore, the method of using the tooling system of this application is as follows:

[0042] This application uses two M4 long screws, which pass through the mounting holes 21 on the disassembly fixture 2 and are screwed into the two pre-machined M4 screw holes on the end face of the gear 1, to securely install the disassembly fixture 2 on the end face of the gear 1. At this time, the first hole section 22 of the disassembly fixture 2 will ensure its coaxiality with the axis of the gear 1.

[0043] Insert a slender rod with a diameter of 5mm into the through hole 25 on the side of the disassembly fixture 2. The slender rod will lock the flat key, thereby achieving circumferential positioning of gear 1 and protecting the flat key.

[0044] Screw the push rod screw 3 into the third hole section 24 (M6 threaded hole) at the end of the disassembly tool 2, so that the ball head structure 32 at its front end contacts the center hole of the long shaft end face.

[0045] By continuously rotating the push rod screw 3 with a wrench, the push rod screw 3 will apply pressure to the long shaft, and the reaction force will smoothly pull gear 1 along with the disassembly fixture 2 off the long shaft. After gear 1 has moved a certain distance and the interference or tapered fit has loosened, gear 1, disassembly fixture 2 and flat key can be easily removed, completing the entire disassembly process.

[0046] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A tooling system for disassembling interference-fit or tapered gears, characterized in that, The gear (1) has at least two disassembly interfaces (11) on its end face, and the tooling system includes: The disassembly fixture (2) is provided with at least two mounting holes (21) and a stepped hole along the axial direction. When the disassembly fixture (2) is connected to the disassembly interface (11) through the mounting holes (21) by fasteners, the disassembly fixture (2) is coaxially fixed on the gear (1). The push rod screw (3) is rotatably installed in the stepped hole. When the push rod screw (3) is rotated, the front end of the disassembly tool (2) presses against the end of the long shaft that cooperates with the gear (1), and the gear (1) moves axially relative to the long shaft and separates through the reaction force.

2. The tooling system according to claim 1, characterized in that, The stepped hole includes a first hole section (22), a second hole section (23), and a third hole section (24) that are connected sequentially from the connecting end of the gear (1) to the operating end of the push rod screw (3), with their diameters decreasing sequentially.

3. The tooling system according to claim 2, characterized in that, The first hole (22) is a centering hole used to mate with the end face of the gear (1). When the disassembly fixture (2) is installed on the gear (1), the first hole (22) makes the disassembly fixture (2) coaxial with the central axis of the gear (1).

4. The tooling system according to claim 2, characterized in that, The second hole segment (23) is a clearance hole, which together with the first hole segment (22) forms a cavity. When the disassembly tool (2) is installed on the end face of the gear (1), the cavity is used to accommodate and radially and axially avoid the long shaft end extending from the gear (1).

5. The tooling system according to claim 4, characterized in that, A radial through hole (25) is provided on the side wall of the disassembly fixture (2), and the through hole (25) is connected to the second hole segment (23).

6. The tooling system according to claim 5, characterized in that, The tooling system also includes a positioning rod for circumferentially positioning the gear (1) through the through hole (25).

7. The tooling system according to claim 2, characterized in that, The third hole (24) is an internally threaded hole used to engage with the push rod screw (3).

8. The tooling system according to claim 1, characterized in that, One end of the push rod screw (3) is a threaded section (31) that engages with the disassembly tool (2), and the other end is a ball head structure (32) for contacting the center hole of the long shaft end face.

9. The tooling system according to claim 1, characterized in that, The fastener is a long screw.

10. The tooling system according to claim 1, characterized in that, The disassembly interface (11) is a threaded structure.

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