Gear and shaft key groove positioning press-fitting tool

Abstract

A gear workpiece is placed on a plastic base, a groove block on the plastic base is right opposite to a gear key groove, circumferential positioning of the gear workpiece is achieved, press-fitting work is completed in a press-fitting acting face, a square groove is right clamped on a flat key of a gear shaft through pulling of a handle, and the gear and shaft key groove positioning press-fitting tool is achieved. Meanwhile, the stroke can be adjusted and controlled, use is convenient and easy, the mistake proofing function is achieved during field use, parts cannot be crushed, and the operation method can be mastered only by conducting field training on staff. The tool has the advantages of being reasonable in design, simple, practical, reliable in positioning, convenient and fast to detect, low in manufacturing cost, convenient to use and manage, and particularly suitable for sample development and small-batch production and use.

Description

Technical Field

[0001] This utility model relates to a gear and shaft keyway positioning and pressing fixture, which is suitable for positioning and pressing small gears with keyways on gear shafts. Background Technology

[0002] The EBIKE electric-assist bicycle's central gearbox contains a gear and gear shaft press-fit component that uses a keyway fit. Normal assembly requires manual visual inspection to first assemble the keyway onto the gear shaft, and then visually inspect the alignment of the gear keyway with the flat key on the gear shaft before press-fitting. This press-fitting method can easily damage parts if the alignment is slightly off, causing unnecessary losses. In addition, this assembly cycle is slow and cannot meet the requirements of mass production. However, this tooling uses a positioning device, which saves time and makes assembly quick and convenient. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings in the existing technology and provide a gear and shaft keyway positioning and pressing fixture that is reasonably designed, simple and practical, reliable in positioning and convenient in testing. This fixture has low manufacturing cost, is easy to use and manage, and is particularly suitable for sample development and small-batch production.

[0004] The technical solution adopted by this utility model to solve the above problems is: a gear and shaft keyway positioning and pressing fixture, including an upper pressing fixture and a lower pressing fixture. The lower pressing fixture includes a base, and a handle mounting platform is fixed on the side of the base. The handle is mounted on the handle mounting platform. A square groove is opened at the end of the handle. The size of the square groove is the same as the key width. By pulling the handle, the square groove is made to fit exactly on the flat key of the gear shaft, so as to realize the alignment of the flat key on the gear shaft with the gear keyway. At the same time, the stroke can be adjusted.

[0005] The base of this utility model is equipped with a positioning block on the top, and the top of the positioning block forms a central positioning shaft; the central positioning shaft is used to be positioned in the gear keyway, which facilitates the pressing of the gear shaft later.

[0006] This utility model relates to a plastic base press-fitted onto a positioning block, wherein the plastic base is provided with a groove. The gear workpiece is placed on the plastic base, and the gear is circumferentially positioned by the groove on the plastic base aligning with the gear keyway. The contact space between the central positioning shaft, the plastic base, and the gear workpiece on the plastic base serves as the pressing surface, and the pressing operation is completed within this pressing surface.

[0007] Preferably, the central positioning shaft is provided with a locking groove in the middle, and the plastic base is provided with a locking block. The plastic base is locked into the locking groove of the central positioning shaft by the locking block, and the plastic base is pressed onto the positioning block by the locking groove.

[0008] Preferably, the central positioning axis is located at the center of the plastic base.

[0009] Preferably, the base is mounted on the workbench with fixing screws; the handle mounting plate is mounted on the base with fixing screws; and the positioning block is mounted on the base with fixing screws.

[0010] Compared with the prior art, this utility model has the following advantages and effects: 1. This utility model is simple and practical, reliable in positioning, and low in cost, making it particularly suitable for sample development and small-batch production; 2. It is very convenient to use, has low requirements for the usage environment, and has a fault-proof function when used on-site, preventing damage to parts; 3. It is simple to use and does not require high qualifications from employees, who can master the operation method simply by receiving on-site training. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0012] Figure 2 This is a schematic diagram of the press-fit structure in an embodiment of the present utility model.

[0013] Figure 3 This is a schematic diagram of the connection structure between the positioning block and the plastic base in an embodiment of this utility model.

[0014] In the diagram: 1. Upper press fitting; 2. Lower press fitting; 3. Base; 4. Handle mounting platform; 41. Handle; 42. Square groove; 5. Positioning block; 51. Center positioning shaft; 52. Locking groove; 6. Plastic base; 61. Groove block; 62. Locking block; 7. Gear workpiece; 8. Flat key; 9. Press fitting working surface. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0016] See Figure 1-3 The gear and shaft keyway positioning and pressing fixture in this embodiment includes an upper pressing fixture 1 and a lower pressing fixture 2. The lower pressing fixture 2 includes a base 3. A handle mounting platform 4 is fixed to the side of the base 3. A handle 41 is mounted on the handle mounting platform 5. A square groove 42 is opened at the end of the handle 41. A positioning block 5 is installed on the top of the base 3. A central positioning shaft 51 is formed on the top of the positioning block 5. A plastic base 6 is pressed onto the positioning block 5. A groove block 61 is provided on the plastic base 6.

[0017] In this embodiment, a locking groove 52 is provided in the middle of the central positioning shaft 51, and a locking block 62 is provided in the plastic base 6. The plastic base 6 is locked in the locking groove 52 of the central positioning shaft 51 through the locking block 62. The plastic base 6 is pressed onto the positioning block 5 through the locking groove 52, and the central positioning shaft 51 is located at the center of the plastic base 6.

[0018] In this embodiment, the base 3 is mounted on the workbench by fixing screws; the handle mounting plate 4 is mounted on the base 3 by fixing screws; and the positioning block 5 is mounted on the base 3 by fixing screws.

[0019] In this embodiment, the gear workpiece 7 is placed on the plastic base 6, and the center of the gear workpiece 7 is positioned on the central positioning shaft 51. The gear workpiece 7 is aligned with the gear keyway by the groove block 61 on the plastic base 6, achieving circumferential positioning of the gear workpiece 7. The positioning method is simple and reliable. The contact space between the gear workpiece 7, the central positioning shaft 51, the plastic base 6, and the gear workpiece 7 is the pressing surface 9, and the pressing work is completed within the pressing surface 9. By pulling the handle 41, the square groove 42 is precisely engaged with the flat key 8 on the gear shaft, achieving alignment between the flat key 8 on the gear shaft and the gear keyway. At the same time, the stroke can be adjusted, making it convenient and simple to use. It has a fault-prevention function during on-site use, preventing damage to parts. It does not require high skills from employees; employees can master the operation method simply by receiving on-site training.

[0020] Operation process: (1) Place the gear workpiece 7 on the plastic base 6, with the groove 61 on the plastic base 6 aligned with the gear keyway to achieve circumferential positioning of the gear; (2) Place the gear shaft with the flat key 8 installed into the gear inner hole, and use the handle 41 on the side of the base 3 to make the square groove 42 of the handle 41 fit exactly on the flat key 8 of the gear shaft, thus keeping the flat key on the gear shaft aligned with the gear keyway. Then install the gear shaft pressing part on top, and the stroke can be adjusted; (3) After the above process is completed, place the product group that is not fully pressed in onto the plastic base 6 of the lower pressing device 2 and press it in place. The entire process is now complete.

[0021] Furthermore, it should be noted that all equivalent or simple variations made based on the structure, features, and principles of this utility model patent are included within the scope of protection of this utility model patent.

Claims

1. A gear and shaft keyway positioning and pressing fixture, characterized in that: It includes an upper press-fit and a lower press-fit. The lower press-fit includes a base, a handle mounting platform is fixed to the side of the base, the handle is mounted on the handle mounting platform, and a square groove is formed at the end of the handle. A positioning block is installed on the top of the base, and the top of the positioning block forms a central positioning axis; The plastic base is pressed onto the positioning block, and the plastic base is provided with a groove.

2. The gear and shaft keyway positioning and pressing fixture according to claim 1, characterized in that: The central positioning shaft has a locking groove in the middle, and the plastic base has a locking block. The plastic base is locked into the locking groove of the central positioning shaft by the locking block, and the plastic base is pressed onto the positioning block by the locking groove.

3. The gear and shaft keyway positioning and pressing fixture according to claim 2, characterized in that: The center positioning axis is located at the center of the plastic base.

4. The gear and shaft keyway positioning and pressing fixture according to claim 1, characterized in that: The base is mounted on the workbench with fixing screws; the handle mounting plate is mounted on the base with fixing screws; the positioning block is mounted on the base with fixing screws.

Images