Pressure control type oil seal assembling method

Abstract

The invention relates to the technical field of oil seal installation, in particular to a pressure control type oil seal assembling method, which comprises the following steps of: assembling an oil seal by adopting a pressure control type oil seal assembling tool of which the pressure provided by the maximum compression amount of a compression spring is the target pressure for installing the oil seal; before press fitting, the oil seal is positioned and mounted in the guide sleeve mounting groove through the outer ring, and the oil seal and the mounting cavity are kept coaxial through the outer circle of the guide sleeve. In the press-fitting process, the pressure transmission flow is a single channel, passes through the compression rod, the compression spring, the spring seat and the pressure head, and is finally transmitted to the oil seal. In the final stage of press fitting, two pressure transmission flows are provided, one pressure transmission flow keeps the compression amount of the compression spring so as to provide stable target pressure, and the other pressure transmission flow unloads redundant pressure to the mounting cavity of the rigid structure through the guide sleeve. According to the invention, the installation precision can be ensured, and low-cost and high-quality production of the installation of the oil seal can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of oil seal installation, in particular to a pressure-controlled oil seal assembly method. The technical field of oil seal installation includes the installation of rotating shaft oil seals of hydraulic components such as hydraulic pumps and hydraulic motors in the fields of engineering machinery, agricultural machinery, etc. Background Art

[0002] Existing oil seal installation technologies include two types: stroke-controlled oil seal assembly tools and methods and servo press press-controlled installation methods.

[0003] The characteristics of the stroke-controlled oil seal assembly tool and method are: the dimension chain is calculated through the oil seal and the relevant installation groove dimensions, and finally an appropriate stroke-controlled oil seal assembly tool is designed. This method is applicable to the case of a simple dimension chain. When the dimension chain of the oil seal installation cavity is complex, the tool design and processing accuracy requirements are very high. In some cases where the dimension chain is complex, the installation accuracy of the oil seal cannot even be guaranteed by controlling the design and processing accuracy of the installation tool.

[0004] The characteristics of the servo press press-fitting control installation method are: this method can realize real-time monitoring of the pressure and press-fitting stroke during the oil seal installation process, determine the final oil seal press-fitting result through specific judgment conditions, and have low requirements for the design and processing of the press-fitting tool. However, the equipment cost to implement this method is relatively high, and general enterprises are unable to popularize this oil seal installation method. Summary of the invention

[0005] The purpose of the present invention is to provide a pressure-controlled oil seal assembly method in view of the fact that the stroke-controlled oil seal assembly tool is sensitive to the dimensions of the oil seal installation. The present invention can ensure the installation accuracy of the oil seal and enable the installation of the oil seal to achieve low-cost and high-quality production.

[0006] The present invention provides the following technical solutions to achieve the above purpose:

[0007] A pressure-controlled oil seal assembly method, comprising an oil seal and an installation cavity; the oil seal assembly method is performed by using a pressure-controlled oil seal assembly tool in which the pressure provided by the maximum compression amount of a compression spring is the target pressure for installing the oil seal, comprising the following steps:

[0008] First, install the oil seal in the guide sleeve installation groove through the outer ring positioning, then place the end of the guide sleeve in the guide groove of the installation cavity, and then apply a pressure exceeding the target pressure to the pressure rod. During the press-fitting process, the pressure transmission flow is a single channel, passing through the pressure rod, compression spring, spring seat and pressure head in sequence, and finally transmitted to the oil seal. When the pressure rod is pressed until it contacts the guide sleeve, the compression spring reaches the maximum compression amount and provides the target pressure for the oil seal through the spring seat and pressure head. Continue to press-fit, and the pressure transmission flow is two channels, one to maintain the compression amount of the compression spring to provide a stable target pressure, and the other to unload the excess pressure on the rigid structure installation cavity through the guide sleeve; finally, remove the pressure control oil seal assembly tool to complete the oil seal assembly;

[0009] The pressure-controlled oil seal assembly tool includes a guide sleeve with a guide sleeve mounting groove at the right end, a pressure rod movably arranged at the left end of the guide sleeve, and a compression spring and a spring seat are arranged inside the guide sleeve; the left end of the compression spring abuts against the end of the pressure rod, and the right end is arranged in the spring seat; the spring seat is connected to the pressure head, and the right end of the pressure head extends into the guide sleeve mounting groove.

[0010] In the aforementioned pressure-controlled oil seal assembly method, the outer end of the pressure rod is provided with an outer pressure plate having an area larger than that of the left end of the guide sleeve, for applying a pressure exceeding the target pressure to the guide sleeve.

[0011] In the aforementioned pressure-controlled oil seal assembly method, the inner end of the pressure rod is provided with an inner pressure plate which matches the clearance with the inner wall of the guide sleeve. The inner pressure plate is used to apply uniform pressure to the compression spring. After the pressure rod is pressed to contact the guide sleeve, the compression spring provides a stable target pressure.

[0012] In the aforementioned pressure-controlled oil seal assembly method, the guide sleeve mounting groove and the oil seal outer ring are arranged in an interference fit.

[0013] In the aforementioned pressure-controlled oil seal assembly method, the guide sleeve installation groove and the installation cavity are matched in size and position and maintain a coaxial relationship, ensuring that the oil seal is installed without deviation.

[0014] In the aforementioned pressure control type oil seal assembly method, a retaining spring is installed at the left end of the guide sleeve to prevent the pressure rod from falling off.

[0015] In the aforementioned pressure-controlled oil seal assembly method, the pressurizing is performed by a pneumatic press or a manual press.

[0016] The above technical solution provided by the present invention has the following beneficial effects:

[0017] The present invention controls the final installation pressure of the oil seal by the compression amount of the compression spring. Before press-fitting, the oil seal is installed in the guide sleeve installation groove by positioning the outer ring, and the oil seal is kept coaxial with the installation cavity through the outer circle of the guide sleeve. During the press-fitting process, the pressure transmission flow is a single channel, passing through the pressure rod to the compression spring to the spring seat to the pressure head, and finally transmitted to the oil seal. In the final stage of press-fitting, the pressure transmission flow is two channels, one to maintain the compression amount of the compression spring to provide a stable target pressure, and the other to unload the excess pressure on the installation cavity of the rigid structure through the guide sleeve.

[0018] Compared with the stroke-controlled oil seal assembly tool and method, the present invention avoids the sensitive characteristics of the oil seal press-fitting size, reduces the risk of oil seal failure during the oil seal installation process, and adopts the maximum compression amount of the compression spring in the seal assembly tool to match the target pressure, which can ensure that the best assembly pressure is provided for the oil seal in each assembly, thereby improving the installation accuracy and reliability. In addition, the oil seal assembly tool provided by the present invention has a simple structure, low design difficulty, and relatively low processing accuracy requirements, which greatly reduces the tool cost.

[0019] Compared with the servo press oil seal press-fitting method, when the present invention is used, it only needs to provide a pressure exceeding the target pressure of the press-fit oil seal, and the excess force can be automatically borne by the rigid structure, and there is no need to control the precise pressure with high precision. Therefore, when the present invention is actually used, it only needs to press the pressure rod on the guide sleeve to complete the assembly, which is very convenient to use. Therefore, the present invention can realize the pressure-controlled press-fit oil seal at an ultra-low cost, which is conducive to large-scale promotion; it is estimated that the cost of the present invention is lower than 1 / 100 of the servo press oil seal press-fitting method. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the force transmission flow during the press-fitting process of the present invention;

[0022] Figure 3 This is a schematic diagram of the force transmission flow in the final stage of press-fitting of the present invention;

[0023] Figure 4 It is a schematic diagram of the process of the present invention;

[0024] Figure markings: 1-pressure rod; 2-circlip; 3-compression spring; 4-guide sleeve; 5-hexagon socket screw; 6-spring seat; 7-pressure head; 8-oil seal; 9-installation cavity; 101-rod; 102-outer pressure plate; 103-inner pressure plate; 401-guide sleeve body; 402-guide sleeve guide section; 403-guide sleeve installation groove; 701-oil seal installation head. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Embodiment: A pressure-controlled oil seal assembly method, the purpose of the method is to assemble the oil seal 8 into the installation cavity 9 using a pressure-controlled oil seal assembly tool;

[0027] The pressure control type oil seal assembly tool structure reference Figure 1 As shown, it includes a guide sleeve 4 with a guide sleeve mounting groove 403 at the right end, a pressure rod 1 is movably provided at the left end of the guide sleeve 4, and a compression spring 3 and a spring seat 6 are provided inside the guide sleeve 4; the left end of the compression spring 3 abuts against the end of the pressure rod 1, and the right end is arranged in the spring seat 6; the spring seat 6 is connected to the pressure head 7, and the right end of the pressure head 7 extends into the guide sleeve mounting groove 403.

[0028] When the method uses the above-mentioned pressure-controlled oil seal assembly tool, the method uses a pressure-controlled oil seal assembly tool in which the pressure provided by the maximum compression amount of the compression spring 3 (in the tool) is the target pressure for installing the oil seal 8, and includes the following steps:

[0029] First, the oil seal 8 is installed in the guide sleeve installation groove 403 through the outer ring positioning, and then the end of the guide sleeve 4 is placed in the guide groove of the installation cavity 9, and then a pressure exceeding the target pressure (i.e., the optimal oil seal assembly pressure) is applied to the pressure rod 1. During the press-fitting process, the pressure transmission flow is a single channel, which passes through the pressure rod 1, the compression spring 3, the spring seat 6 and the pressure head 7 in sequence, and is finally transmitted to the oil seal 8. When the pressure rod 1 is pressed until it contacts the guide sleeve 4, the compression spring 3 reaches the maximum compression amount (i.e., the compression spring 3 is compressed to the target height, at which time the compression spring 3 can provide the target pressure, thereby achieving the purpose of installing the oil seal 8 in a specific pressure control form) and the target pressure is provided to the oil seal 8 through the spring seat 6 and the pressure head 7. The press-fitting is continued, and the pressure transmission flow is two channels, one of which maintains the compression amount of the compression spring 3 to provide a stable target pressure, and the other unloads the excess pressure on the rigid structure installation cavity 9 through the guide sleeve 4; finally, the pressure-controlled oil seal assembly tool is removed to complete the oil seal assembly.

[0030] The pressure transfer flow reference during this method Figure 2-3 As shown. Reference for force transmission flow during press fitting Figure 2 The pressure F provided by the press is transmitted to the compression spring 3 through the pressure rod 1, and then to the pressure head 7 through the spring seat 6, and finally acts on the oil seal 8. Figure 3 The pressure maintains the compression amount of the compression spring 3 through a part of the pressure of the pressure rod 1 (target pressure value F3), and the excess pressure F1+F2 (i.e. F-F3) is transmitted to the installation cavity 9 parts through the guide sleeve 4. The installation cavity 9 parts are rigid structures that can bear the excess pressing force.

[0031] The outer end of the pressure rod 1 is provided with an outer pressure plate 102 whose area is larger than the area of ​​the left end of the guide sleeve 4 , so as to apply a pressure exceeding the target pressure to the guide sleeve 4 .

[0032] The inner end of the pressure rod 1 is provided with an inner pressure plate 103 which matches the inner wall clearance of the guide sleeve 4. The inner pressure plate 103 is used to apply uniform pressure to the compression spring 3. After the pressure rod 1 is pressed to contact the guide sleeve 4, the compression spring 3 provides a stable target pressure.

[0033] The guide sleeve installation groove 403 and the oil seal outer ring are arranged in an interference fit. Through the interference fit, the oil seal 8 is fixed in the installation groove, and the oil seal 8 will not fall off even if the guide sleeve 4 opens downward.

[0034] The guide sleeve installation groove 403 matches the size and position of the installation cavity 9 and maintains a coaxial relationship. Figure 1 As shown, the end of the guide sleeve 4 is placed in the guide groove of the mounting cavity 9, and the positions of the two mounting grooves are aligned and have the same diameter. In this way, the oil seal 8 can be guided by the guide sleeve mounting groove 403 and the mounting groove of the mounting cavity 9, thereby ensuring that the oil seal 8 is installed without deviation and preventing irreversible damage to the outer ring of the oil seal 8 during the installation process.

[0035] A retaining spring 2 is installed at the left end of the guide sleeve 4 to prevent the pressure rod 1 from falling off.

[0036] The pressure is applied by a pneumatic press or a manual press, wherein the pneumatic press or the manual press directly acts on the outer pressure plate 102 of the pressure rod 1, and applies pressure to the compression spring 3 through the inner pressure plate 103 of the pressure rod 1.

[0037] Furthermore, in the above-mentioned pressure-controlled oil seal assembly tool, the spring seat 6 is connected to the pressure head 7 through a hexagon socket screw; the pressure rod 1 includes a rod member 101, the left end of the rod member 101 is connected to an outer pressure plate 102 arranged outside the guide sleeve 4, and the right end of the rod member 101 is connected to an inner pressure plate 103 arranged between the retaining ring 2 and the compression spring 3.

[0038] The guide sleeve 4 includes, from left to right, a guide sleeve body 401, a guide sleeve guide section 402, and a guide sleeve installation groove 403. The pressure head 7 is slidably disposed in the guide sleeve guide section 402. An oil seal installation head 701 is disposed at the right end of the pressure head 7. Through the guidance of the guide sleeve guide section 402 of the guide sleeve 4 and the pressure head 7, it is convenient for the oil seal installation head 701 to apply pressure to the oil seal.

[0039] In the aforementioned pressure-controlled oil seal assembly tool, the functions of the main parts are as follows: pressure rod 1, which is in direct contact with the press, bears pressure and has a limit function; retaining spring 2, limits the pressure rod 1 from falling off; compression spring 3, provides a certain pressure to the pressure head 7; guide sleeve 4, as the tool base, plays a guiding, pressure-bearing and unloading role; hexagon socket screw 5, has a connection and tightening function; spring seat 6, bears the spring and connects the pressure head; pressure head 7, contacts the outer ring of the oil seal, and pushes the oil seal into the installation position.

[0040] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical solution and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A method for assembling a pressure-controlled oil seal, comprising an oil seal (8) and a mounting cavity (9), characterized in that: The oil seal assembly method is performed by using a pressure-controlled oil seal assembly tool in which the pressure provided by the maximum compression amount of the compression spring (3) is the target pressure for installing the oil seal (8), and comprises the following steps: First, the oil seal (8) is installed in the guide sleeve installation groove (403) through the outer ring positioning, and then the end of the guide sleeve (4) is placed in the guide groove of the installation cavity (9), and then a pressure exceeding the target pressure is applied to the pressure rod (1). During the press-fitting process, the pressure transmission flow is a single path, which passes through the pressure rod (1), the compression spring (3), the spring seat (6) and the pressure head (7) in sequence, and is finally transmitted to the oil seal (8). When the pressure rod (1) is pressed until it contacts the guide sleeve (4), the compression spring (3) reaches the maximum compression amount and provides the target pressure for the oil seal (8) through the spring seat (6) and the pressure head (7). The press-fitting is continued, and the pressure transmission flow is two paths, one of which maintains the compression amount of the compression spring (3) to provide a stable target pressure, and the other path unloads the excess pressure on the rigid structure installation cavity (9) through the guide sleeve (4); finally, the pressure control type oil seal assembly tool is removed to complete the oil seal assembly; The pressure-controlled oil seal assembly tool comprises a guide sleeve (4) having a guide sleeve mounting groove (403) at its right end, a pressure rod (1) movably arranged at the left end of the guide sleeve (4), and a compression spring (3) and a spring seat (6) arranged inside the guide sleeve (4); the left end of the compression spring (3) abuts against the end of the pressure rod (1), and the right end is arranged in the spring seat (6); the spring seat (6) is connected to a pressure head (7), and the right end of the pressure head (7) extends into the guide sleeve mounting groove (403).

2. The pressure control type oil seal assembly method according to claim 1, characterized in that: The outer end of the pressure rod (1) is provided with an outer pressure plate (102) having an area larger than the area of ​​the left end of the guide sleeve (4), which is used to apply a pressure exceeding the target pressure to the guide sleeve (4).

3. The pressure control type oil seal assembly method according to claim 1, characterized in that: The inner end of the pressure rod (1) is provided with an inner pressure plate (103) which is in clearance with the inner wall of the guide sleeve (4). The inner pressure plate (103) is used to apply pressure evenly to the compression spring (3). After the pressure rod (1) is pressed to contact the guide sleeve (4), the compression spring (3) provides a stable target pressure.

4. The pressure control type oil seal assembly method according to claim 1, characterized in that: The guide sleeve installation groove (403) and the oil seal outer ring are arranged in an interference fit.

5. The pressure control type oil seal assembly method according to claim 1, characterized in that: The guide sleeve installation groove (403) and the installation cavity (9) are matched in size and position and maintain a coaxial relationship, thereby ensuring that the oil seal (8) is installed without deviation.

6. The pressure control type oil seal assembly method according to claim 1, characterized in that: A retaining spring (2) is installed at the left end of the guide sleeve (4) to prevent the pressure rod (1) from falling off.

7. The pressure control type oil seal assembly method according to claim 1, characterized in that: The pressing is performed by a pneumatic press or a manual press.

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