A cylindrical pin press fitting tool in a pin hole at an inner hole

Abstract

The present application provides a pin hole inner cylindrical pin press fitting tool at an inner hole, comprising a positioning shaft, a positioning pin and a ejector pin, the positioning shaft is provided with a plurality of cylindrical pin guide holes, the positioning pin is inserted into one of the cylindrical pin guide holes and a part pin hole; during press fitting, the cylindrical pin is inserted into the rest of the cylindrical pin guide holes, the ejector pin is inserted into the cylindrical pin guide hole and aligns the cylindrical pin to press the cylindrical pin into the part pin hole; when assembling the cylindrical pin at the pin hole of the inner hole, the cylindrical pin to be installed can be accurately aligned with the pin hole opening position through the cylindrical pin guide hole by positioning with the positioning pin when using the press fitting tool, the ejector pin can only force the cylindrical pin along the direction of the cylindrical pin guide hole, and the cylindrical pin is hammered into the pin hole, which not only avoids the damage to the inner wall of the pin hole and the surrounding of the opening caused by the deviation of the punch when directly installing the cylindrical pin with the punch, but also improves the installation qualification rate.

Description

Technical Field

[0001] This invention belongs to the field of mechanical assembly, and specifically relates to a cylindrical pin press-fitting tool located in the pin hole of the inner hole of a part. Background Technology

[0002] In assembly drawings, designers often incorporate a structure where tiny pin holes are drilled into the inner bores of two assembled parts. These pin holes, typically blind holes at an angle, pass through both parts. A cylindrical pin is then installed inside the pin hole to connect and secure the two parts, ensuring the pin does not protrude from the hole opening. The pin and pin hole are interference-fitted, and the pin is very short, sometimes with a diameter of only Φ2.5 and a length of only 6. During operation, the operator must manually align the tiny pin with the pin hole opening, first hammering the pin partially in, and then using a punch to push the pin into the hole from the tail. Due to the limited space, the process is difficult to observe, and the punch's position is not fixed, potentially causing it to shift and damage the hole wall or the surrounding parts. This makes the operation very inefficient. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a tool for pressing cylindrical pins into the pin hole located in the inner hole. This tool not only avoids damage to the inner wall of the pin hole and the area around the opening caused by the punch offset when the cylindrical pin is directly pressed against the punch during installation, but also improves the installation efficiency.

[0004] This invention is achieved through the following technical solution:

[0005] A tool for pressing in a cylindrical pin inside a pin hole located in the inner bore, comprising,

[0006] Positioning shaft, positioning pin, and top pin.

[0007] The positioning shaft is provided with multiple cylindrical pin guide holes, and the positioning pin is inserted into one of the cylindrical pin guide holes and the part pin hole; during press fitting, the cylindrical pin is inserted into the remaining cylindrical pin guide holes, and the top pin is inserted into the cylindrical pin guide holes and aligned with the cylindrical pin to press the cylindrical pin into the part pin hole.

[0008] Preferably, the number of cylindrical pin guide holes is ≥2.

[0009] Preferably, the cylindrical pin guide hole and the part pin hole are positioned at the same angle.

[0010] Preferably, the positioning shaft is provided with a radial positioning surface for positioning with the inner hole of the part.

[0011] Preferably, the positioning shaft is provided with an end face positioning surface for positioning with the end face of the part.

[0012] Preferably, the cylindrical pin is interference-fitted with the pin hole of the part.

[0013] Preferably, during press-fitting, the head of the top pin is aligned with the tail of the cylindrical pin and abuts against the cylindrical pin. By applying pressure to the top pin, the cylindrical pin is hammered into the pin hole of the part.

[0014] Preferably, the outer diameter of the locating pin is the same as the inner diameter of the pin hole in the part.

[0015] Preferably, the positioning end face above the cylindrical pin guide hole on the positioning shaft is removed.

[0016] Preferably, during use, the positioning shaft is inserted with the inner hole and end face of the part in place.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] This invention provides a tool for pressing cylindrical pins into pin holes located in the inner hole, comprising a positioning shaft, a positioning pin, and a top pin. The positioning shaft is provided with multiple cylindrical pin guide holes, and the positioning pin is inserted into one of the cylindrical pin guide holes and the part pin hole. During pressing, the cylindrical pin is inserted into the remaining cylindrical pin guide holes, and the top pin is inserted into the cylindrical pin guide holes and aligned with the cylindrical pin to press the cylindrical pin into the part pin hole. When assembling cylindrical pins in the pin hole of the inner hole, when using the pressing tool, the positioning pin is used for positioning, and the cylindrical pin to be installed can be accurately aligned with the pin hole opening through the cylindrical pin guide hole. The top pin can only apply force to the pin in the direction of the cylindrical pin guide hole to hammer the cylindrical pin into the pin hole. This not only avoids the damage to the inner wall of the pin hole and the area around the opening caused by the punch offset when directly pressing the cylindrical pin, but also improves the installation qualification rate. Attached Figure Description

[0019] Figure 1 A schematic diagram of a tool for pressing cylindrical pins into pin holes;

[0020] Figure 2 The three views are of a tool for pressing cylindrical pins into pin holes, where (a) is the top view, (b) is the front view, and (c) is the side view.

[0021] Figure 3 This is a schematic diagram of a cylindrical pin press-fit tool mounted on a part, where Figure (a) is the front view and Figure (b) is the rotated view.

[0022] In the diagram: 1—locating shaft; 2—locating pin; 3—top pin; 4—cylindrical pin; 5—part. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] A tool for pressing cylindrical pins into the inner hole of a pin hole, such as... Figure 1 As shown, including,

[0026] Positioning shaft 1, positioning pin 2, and top pin 3,

[0027] The positioning shaft 1 is provided with multiple cylindrical pin guide holes. The positioning pin 2 is inserted into one of the cylindrical pin guide holes and the part pin hole. During press-fitting, the cylindrical pin 4 is inserted into the remaining cylindrical pin guide holes, and the top pin 3 is inserted into the cylindrical pin guide holes and aligned with the cylindrical pin 4 to press the cylindrical pin 4 into the part pin hole. The positioning shaft 1 has a ring-shaped structure. The interior of the positioning shaft has a trapezoidal slope.

[0028] The number of cylindrical pin guide holes is ≥2. In a preferred embodiment, the present invention employs two cylindrical pin guide holes, which are symmetrically arranged and located at both ends of the upper and lower positioning shafts 1; the cylindrical pin guide holes are inclined at a certain angle in the horizontal direction; the angular positions of the cylindrical pin guide holes and the pin holes of the parts are consistent.

[0029] The positioning shaft 1 is provided with a radial positioning surface along the radial direction for positioning with the inner hole of the part. The positioning shaft 1 is also provided with an end face positioning surface for positioning with the end face of the part; the form and structure of the end face positioning surface are matched with the end face of the part.

[0030] The positioning end face above the guide hole of the cylindrical pin on the positioning shaft 1 is removed so that the pin hole opening is not obstructed when the pin is installed, making it easy to observe.

[0031] The cylindrical pin 4 is interference-fitted with the pin hole of the part to prevent loosening and incorrect fixing.

[0032] During press fitting, the head of the top pin 3 is aligned with the tail of the cylindrical pin 4 and abuts against the cylindrical pin 4. By applying pressure to the top pin 4, the cylindrical pin 4 is hammered into the pin hole of the part.

[0033] The outer diameter of the locating pin 2 is the same as the inner diameter of the pin hole in the part.

[0034] When in use, positioning shaft 1 is inserted to be positioned using the inner hole and end face of the part.

[0035] Example 1

[0036] A cylindrical pin press-fitting tool, such as Figure 2 and Figure 3 As shown: Figure 2 In the diagram, a is the cylindrical pin guide hole; b is the end face positioning surface (positioning with the end face of the part); and c is the radial positioning surface (positioning with the inner hole of the part).

[0037] The cylindrical pin press-fitting tool includes a positioning shaft, a positioning pin, and a top pin. The positioning shaft has a set of cylindrical pin guide holes (number of holes ≥ 2), and the number of cylindrical pin guide holes depends on the specific requirements of the part in actual use.

[0038] First, position the locating shaft using the inner hole and end face of the part for positioning. Second, to prevent the pressing tool from rotating and to ensure that the pin hole to be installed is angularly aligned with the cylindrical pin guide hole, insert the locating pin into one cylindrical pin guide hole along with the part's pin hole simultaneously. Then, insert the cylindrical pin to be installed into the remaining cylindrical pin guide hole, and the cylindrical pin will slide down the guide hole to the bottom and align with the pin hole. Finally, insert the top pin into the cylindrical pin guide hole. The head of the top pin will align with the tail of the cylindrical pin that was just inserted. By applying pressure to the top pin, the cylindrical pin is hammered into the pin hole.

[0039] 1. A positioning shaft 1: its outer circle and end face are positioned with the inner hole and upper end face of the part, and it has a set of cylindrical pin guide holes (number of holes ≥ 2). The corresponding positioning end face above the cylindrical pin guide holes is removed so that the pin hole opening is not obstructed when installing the pin, making it easy to observe.

[0040] 2. A locating pin 2: Its size is consistent with the pin hole of the part, and it needs to be inserted into the pin hole for positioning.

[0041] 3. A top pin 3: It needs to be inserted into the guide hole of the cylindrical pin on the positioning shaft. Align the cylindrical pin and press the cylindrical pin into the pin hole.

[0042] In practice, the positioning shaft is first placed into the part by positioning it with the inner hole and end face. To prevent the pressing tool from rotating and to ensure that the angular position of the cylindrical pin guide hole is aligned with the pin hole of the part, a positioning pin is first inserted into one cylindrical pin guide hole along with the pin hole of the part. Then, the cylindrical pin to be installed is placed into the remaining cylindrical pin guide hole, and the cylindrical pin will slide down the cylindrical pin guide hole to the bottom and align with the pin hole. Finally, the top pin is inserted into the cylindrical pin guide hole, and the head of the top pin will align with the tail of the previously inserted cylindrical pin. By applying pressure to the top pin, the cylindrical pin is hammered into the pin hole.

[0043] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or device.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A tool for pressing a cylindrical pin inside a pin hole located in the inner bore, the tool being used in the following structural applications: Drill very small diameter pin holes in the inner holes of the two assembled parts. These pin holes are blind holes that pass through both parts. Then, install cylindrical pins inside the pin holes to connect and secure the two parts. The cylindrical pins must not protrude from the hole opening. The key feature is... The pressing tool includes: Positioning shaft (1), positioning pin (2), and top pin (3); The positioning shaft (1) is provided with multiple cylindrical pin guide holes. The positioning pin (2) is inserted into one of the cylindrical pin guide holes and the part pin hole. During press fitting, the cylindrical pin (4) is inserted into the remaining cylindrical pin guide holes. The top pin (3) is inserted into the cylindrical pin guide hole and aligned with the cylindrical pin (4) to press the cylindrical pin (4) into the part pin hole. The positioning shaft (1) is provided with a radial positioning surface for positioning with the inner hole of the part; The positioning shaft (1) is provided with an end face positioning surface for positioning with the end face of the part; The outer diameter of the positioning pin (2) is the same as the inner diameter of the pin hole of the part; Remove the positioning end face above the cylindrical pin guide hole on the positioning shaft (1); When in use, the positioning shaft (1) is positioned and inserted using the inner hole and end face of the part.

2. The cylindrical pin press-fitting tool located in the inner hole according to claim 1, characterized in that, The number of cylindrical pin guide holes is ≥2.

3. The cylindrical pin press-fitting tool located in the inner hole according to claim 1, characterized in that, The cylindrical pin guide hole and the part pin hole are positioned at the same angle.

4. The cylindrical pin press-fitting tool located in the inner hole according to claim 1, characterized in that, The cylindrical pin is interference-fitted with the pin hole of the part.

5. The cylindrical pin press-fitting tool located in the inner hole according to claim 1, characterized in that, During press fitting, the head of the top pin (3) is aligned with the tail of the cylindrical pin (4) and abuts against the cylindrical pin (4). By applying pressure to the top pin (3), the cylindrical pin (4) is hammered into the pin hole of the part.

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