Guiding and positioning device for press fitting of tiny lining and thin-wall shell

Abstract

The utility model belongs to the field of design and processing of products, and particularly relates to a guiding and positioning device for press fitting of a tiny bush and a thin-wall shell. The positioning device comprises a bushing guide pin and a press fitting body; the bushing guide pin comprises a guide conical section, a positioning cylindrical section, a connecting thread section and a straight slot; a linear groove used for disassembling the device after assembly is completed is formed in the guide conical section; the outer surface of the guide conical section is a guide conical surface, and the outer surface of the positioning cylindrical section is a positioning cylindrical surface; a connecting thread of the connecting thread section is used for placing the bushing and is connected with the press-fitting body; the press-fitting body is of a cylindrical structure, a connecting threaded hole is formed in the lower end, and two flat faces are symmetrically cut downwards from the upper end. The connecting threaded hole is matched with the connecting thread, and the outer circular face and the flat face of the press-fitting body are used for clamping and preventing rotation of a wrench when the device is disassembled. The device solves the assembly problems that the tiny bushings are difficult to align and put into the mounting holes and are not pressed rightly, and is simple, convenient and quick to process, easy to operate and high in reliability.

Description

Technical Field

[0001] This utility model belongs to the field of product design and processing, and specifically relates to a guiding and positioning device for press-fitting of micro bushings and thin-walled shells. Background Technology

[0002] Hydraulic valves are widely used in aerospace, automotive, petroleum, engineering machinery, and biomedical fields. Their function is to control the pressure, direction, and flow rate of fluid in a hydraulic system, thereby controlling all the functions of the entire hydraulic system. They mainly include pressure control valves, flow control valves, and directional control valves. All of these valve types involve a crucial process of controlling the flow of fluid, which requires a valve structure. The valve structure is generally a ball valve or cone valve, achieving fluid flow control through the contact and separation of spherical and conical surfaces. However, to construct a complete hydraulic valve, components such as springs, screws, valve seats, and housings need to be combined to achieve various logical functions. During assembly, ball valves or cone valves need to be installed in the housing. Because they are responsible for hydraulic flow control, their fit with the housing is generally an interference fit or a transition fit. The installation process must be free of scratches, misalignment, or other defects; if these occur, the system will fail. Ball valves and cone valves are generally installed outside the valve body, making alignment difficult during installation and observation challenging after placement. This is especially true for the assembly of small ball valves or cone valves, which is not only time-consuming and labor-intensive, but also makes them more susceptible to damage due to the lower hardness of the valve body material compared to ball valves and cone valves. Misalignment during press-fitting can easily cause scratches and lead to oil leaks. Therefore, ensuring proper alignment and guidance during press-fitting is crucial and essential in hydraulic valve assembly. Utility Model Content

[0003] The purpose of this invention is to address the product failure caused by difficulties in aligning ball valves or needle valves during installation and misalignment during press-fitting. This invention provides a simple, fast, and accurate guiding and positioning device to ensure precise positioning and clamping, achieving fast, low-cost, and highly reliable processing.

[0004] The technical solution is:

[0005] A guiding and positioning device for press-fitting micro bushings and thin-walled housings is provided, comprising a bushing guide pin and a press-fitting body; the bushing guide pin includes a guide cone section, a positioning cylindrical section, a connecting thread section, and a slotted groove;

[0006] A slot is formed on the guide cone section for assembling and disassembling the device after completion; the outer surface of the guide cone section is a guide cone surface, which is a 30° cone surface, and the outer surface of the positioning cylindrical section is a positioning cylindrical surface for positioning with the mounting hole of the shell; the connecting thread of the connecting thread section is used for placing the bushing and connecting with the press-fitting body; the press-fitting body is a cylindrical structure, a connecting thread hole is formed at the lower end, and two flat surfaces are symmetrically cut downward at the upper end; the connecting thread hole is matched with the connecting thread, and the outer cylindrical surface and the flat surface of the press-fitting body are used for wrench clamping and anti-rotation during disassembly of the device;

[0007] During use, the connecting thread of the bushing guide pin is placed into the inner hole of the bushing, then the connecting thread of the bushing guide pin is connected with the connecting thread hole of the press-fitting body, and the two are connected into one, through the guiding effect of the guide cone surface and the positioning effect of the positioning cylindrical surface, the shell one end surface is positioned by using a vice, the flat end surface of the press-fitting body is pressed, the bushing is installed in the shell hole, after completion of installation, the flat surface is clamped by using a wrench, and the tool and the bushing can be separated by using a slot screw through the slot.

[0008] Further, the guide cone surface can adjust the size of the guide angle according to needs.

[0009] Further, the bushing guide pin is provided with different positioning cylindrical surfaces and connecting threads according to the size of the shell assembly hole and the inner hole of the bushing part.

[0010] Further, the connecting thread is designed as a cylindrical thread or a square thread according to the structure of the bushing part.

[0011] Further, the diameter of the outer cylindrical surface is smaller than the diameter of the shell mounting hole by 0.01mm-0.06mm.

[0012] Further, the diameter of the outer cylindrical surface is smaller than the diameter of the shell step hole by 0.07mm-0.12mm, which plays a role in auxiliary positioning and eliminating form error.

[0013] Further, the slot of the bushing guide pin and the flat surface of the press-fitting body are used together during disassembly.

[0014] The device has the advantages and beneficial effects that in the assembly and processing of similar sealing, direction and flow control functional parts and the shell in a hydraulic control valve, a guiding and positioning device is provided, which realizes accurate positioning and guiding of small functional parts and similar structural parts in assembly. The device can realize the following three functions:

[0015] 1. The guide pin guide cone surface can quickly align the center of the mounting hole, so that the center of the bushing is aligned with the mounting hole.

[0016] 2. The guide pin positioning cylindrical surface guides the bushing to uniformly enter the mounting hole.

[0017] 3. The whole device is integrated with the bushing, which solves the problems of difficult alignment, placement and pressure deviation of small parts, realizes accurate positioning, reduces the alignment time and improves the installation quality.

[0018] 4. The flat surface and the straight screw structure solve the problems of installation and separation of the device and the bushing. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a three-dimensional view of a guiding and positioning device for small bushings and thin-walled shells.

[0020] Figure 2 It is a three-dimensional view of a guiding pin.

[0021] Figure 3 It is a three-dimensional view of a tool body.

[0022] Figure 4 It is a two-dimensional view of a bushing part.

[0023] Figure 5 It is a two-dimensional view of a valve body part.

[0024] Figure 6 It is a three-dimensional view of a device and a bushing assembly.

[0025] Figure 7 It is a two-dimensional view of a bushing and a device placed into a shell.

[0026] Figure 8 It is a two-dimensional view of a bushing and a device placed into a shell.

[0027] Figure 9 It is a two-dimensional view of a bushing placed into a shell.

[0028] Figure 10 It is a two-dimensional view of another completed hydraulic valve. DETAILED DESCRIPTION

[0029] The utility model will be further described in detail in combination with the drawings and examples:

[0030] The utility model provides a kind of guiding positioning device for micro bush and thin-wall shell press fitting, including bush guiding pin 1, press fitting body 2.Bush guiding pin 1 its characterized in that, including guiding cone surface 11 is 30 ° cone surface, positioning cylindrical surface 12 is used to with shell mounting hole positioning, connecting thread 13 is used to place bush and with press fitting body connection, slot 14 is used to disassemble device after assembly is completed;The press fitting body 2 its characterized in that, including connecting thread hole 21 and connecting thread 13 cooperation, outer circular surface 22, flat surface 23 is used when disassembly device wrench clamping anti-rotation.

[0031] As Figures 1-3 The utility model provides a kind of guiding positioning device for micro bush and thin-wall shell press fitting, including bush guiding pin 1, press fitting body 2.The bush guiding pin 1 its characterized in that, including guiding cone surface 11 is 30 ° cone surface, positioning cylindrical surface 12 is used to with shell mounting hole positioning, connecting thread 13 is used to place bush and with press fitting body connection, slot 14 is used to disassemble device after assembly is completed;The press fitting body 2 its characterized in that, including connecting thread hole 21 and connecting thread 13 cooperation, outer circular surface 22, flat surface 23 is used when disassembly device wrench clamping anti-rotation.

[0032] When using, the connecting thread 13 of bush guiding pin 1 is placed into the inner hole of bush, then the connecting thread 13 of bush guiding pin 1 is connected with the connecting thread hole 21 of press fitting body 2, and is connected into an integral whole, through the guiding effect of guiding cone surface 11, the positioning effect of positioning cylindrical surface 12, with precision vice with one end surface of shell positioning, the flat end surface of press fitting body 2 is pressed tightly, bush is installed in shell hole, after installation is completed, flat surface 23 is clamped by wrench, and bush can be separated from tooling by slotting screw through slot 14.

[0033] Example 1

[0034] As Figures 4-5 The utility model provides a kind of guiding positioning device for micro bush and thin-wall shell press fitting, including bush guiding pin 1, press fitting body 2.The bush guiding pin 1 its characterized in that, including guiding cone surface 11 is 30 ° cone surface, positioning cylindrical surface 12 is used to with shell mounting hole positioning, connecting thread 13 is used to place bush and with press fitting body connection, slot 14 is used to disassemble device after assembly is completed;The press fitting body 2 its characterized in that, including connecting thread hole 21 and connecting thread 13 cooperation, outer circular surface 22, flat surface 23 is used when disassembly device wrench clamping anti-rotation. Cooperating outer circle Length 1.66mm, material stainless steel, hardness HRC≥57, shell mounting hole Material stainless steel, hardness HRC 34-42.

[0035] According to the inner hole of the bushing Due to its small size, the connecting thread 13 uses an M1.6 thread for both positioning and connection. The dimensions of the positioning cylindrical surface 12 are...

[0036] The process involves four steps:

[0037] Step 1: As Figure 5 As shown, the bushing 3 is inserted into the connecting thread 13 of the guide pin 1, the flat surface 23 of the mounting body 2 is clamped with a wrench, and the bushing and the device are fixed together by a flathead screwdriver through the flathead groove 14.

[0038] Step Two: As Figure 6 As shown, bushing 3 and device are placed into housing 4.

[0039] Step 3: As Figure 7 As shown, use a vise or press to position one end face of the housing 4, press and tighten the flat end face of the press-fit body 2, and install the bushing 3 in the hole of the housing 4.

[0040] Step Four: As Figures 8-9 As shown, clamp the flat surface 23 with a wrench, and use a flathead screwdriver to separate the tooling from the bushing through the slot 14.

[0041] Example 2

[0042] like Figure 10 As shown, this hydraulic valve has a split housing structure, consisting of housing 5 and housing 8. Its assembly process is divided into 6 steps, of which the first four steps are the same as in Example 1, and the last two steps are welding housing 8 and pressing valve seat 7.

[0043] The above description is merely an embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any non-substantial improvements to the present utility model should be within the protection scope of the present utility model.

Claims

1. A guide positioning device for press fitting of a micro bushing and a thin-walled housing, characterized by, It comprises a bush guiding pin (1) and a press fitting body (2); the bush guiding pin (1) comprises a guiding cone section, a positioning cylinder section, a connecting thread section and a slot (14); the guiding cone section is provided with the slot (14) for disassembling the device after assembly; the outer surface of the guiding cone section is a guiding cone surface (11) which is a 30° cone surface; the outer surface of the positioning cylinder section is a positioning cylinder surface (12) for positioning with the mounting hole of the shell; the connecting thread (13) of the connecting thread section is used for placing the bush and connecting with the press fitting body; the press fitting body (2) is a cylindrical structure, the lower end is provided with a connecting thread hole (21), and the upper end is symmetrically cut into two flat surfaces (23); the connecting thread hole (21) is matched with the connecting thread (13), and the outer cylindrical surface (22) and the flat surface (23) of the press fitting body (2) are used for preventing rotation when clamped by a wrench during disassembly of the device. During use, the connecting thread (13) of the bush guiding pin (1) is placed into the inner hole of the bush, then the connecting thread (13) of the bush guiding pin (1) is connected with the connecting thread hole (21) of the press fitting body (2), and the two are connected into one body; through the guiding effect of the guiding cone surface (11) and the positioning effect of the positioning cylinder surface (12), the shell is positioned by a vice with one end surface of the shell, the flat end surface of the press fitting body (2) is pressed, the bush is installed in the hole of the shell, after installation, the flat surface (23) is clamped by a wrench, and the tool and the bush are separated through the slot (14) by using a slot screw. The guiding cone surface (11) can adjust the size of the guiding angle according to needs.

2. A guide positioning device for press fitting of a small bushing and a thin wall housing according to claim 1, wherein The bush guiding pin (1) is provided with different positioning cylinder surfaces (12) and connecting threads (13) according to the size of the mounting hole of the shell and the inner hole of the bush part.

3. A guide positioning device for press fitting of a small bushing and a thin wall housing according to claim 1, wherein The connecting thread (13) is designed as a cylindrical thread or a square thread according to the structure of the bush part.

4. A guide positioning device for press fitting of a small bushing and a thin wall housing according to claim 1, wherein The diameter of the outer cylindrical surface (22) is 0.01mm-0.06mm smaller than the diameter of the mounting hole of the shell.

5. A guide positioning device for press fitting of a small bushing and a thin wall housing according to claim 1, wherein The diameter of the outer cylindrical surface (22) is 0.07mm-0.12mm smaller than the diameter of the stepped hole of the shell, which plays a role in auxiliary positioning and eliminating form and position errors.

6. A guide positioning device for press fitting of a small bushing and a thin wall housing according to claim 1, wherein The slot (14) of the bush guiding pin (1) and the flat surface (23) of the press fitting body (2) are used together during disassembly.

7. A guide positioning device for press fitting of a small bushing and a thin wall housing according to claim 1, wherein ​

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