Deep hole O-ring assembly device and assembly method

Abstract

The present invention belongs to the field of mechanical structure technology and relates to a deep-hole O-ring assembly device and assembly method. The device includes a core shaft, a sleeve, and a positioning sleeve. The core shaft, sleeve, and positioning sleeve are coaxially arranged from the inside out. Compared with the existing technology, the O-ring can be conveniently, quickly, and safely installed in the designated groove. This not only improves work efficiency and reduces assembly difficulty, but also avoids the potential malfunction caused by the failure to promptly detect damage to the O-ring during the assembly process. The direct benefit of this device is to increase the assembly success rate, improve work efficiency, and reduce product production costs. The indirect benefit is to avoid O-ring damage caused by improper assembly or tool use, which affects product use and function, reduce product maintenance costs, and improve product reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical structures, relates to the assembly of O-rings, and in particular to a deep-hole O-ring assembly device and an assembly method. Background Art

[0002] O-ring sealing structure is the most common sealing structure in mechanical mechanisms.

[0003] In special cases, due to structural and functional limitations, some structures require the installation of O-rings inside deep holes. Figure 1 As shown, position A is a typical deep hole inner groove O-ring.

[0004] When assembling this type of O-ring, due to the small hole, the assembler cannot reach into the hole for assembly, even with the use of auxiliary tools such as hooks (see attached). Figure 2 ), it is also difficult to assemble due to the difficulty in observation and inconvenient operation, and the sharp hook can easily cause the O-ring to twist and damage when it is turned, and this twisting and damage cannot be discovered in time, resulting in hidden trouble. Summary of the Invention

[0005] The purpose of the present invention is to provide a deep hole O-ring assembly device and assembly method, which is used to solve the problem of assembling O-rings in deep hole inner grooves of parts. The following purposes can be achieved by using this device:

[0006] 1) Easy to operate and quick to assemble;

[0007] 2) The O-ring can be accurately installed into the specified groove in the deep hole;

[0008] 3) The O-ring will not be twisted or damaged during operation, which will affect the sealing effect of the O-ring and will not cause any hidden dangers of failure.

[0009] Technical solution of the present invention

[0010] A deep hole O-ring assembly device includes a core shaft, a sleeve and a positioning sleeve, wherein the core shaft, the sleeve and the positioning sleeve are coaxially arranged in sequence from the inside to the outside, wherein:

[0011] The core shaft is a cylindrical hollow structure, with a five-claw thin-walled structure with good elasticity at the front end, an O-ring groove provided on the five-claw thin-walled structure, a core shaft end face flange provided at the rear end, and a limit groove provided on the outer cylindrical surface of the core shaft;

[0012] The sleeve is a cylindrical hollow structure, the sleeve is sleeved on the outside of the core shaft, and the sleeve can slide axially on the outer surface of the core shaft. The front end of the sleeve is a five-claw thin-walled structure with good elasticity, which cooperates with the O-ring groove on the five-claw thin-walled structure at the front end of the core shaft to form an O-ring receiving cavity, and the outer diameter of the O-ring receiving cavity is smaller than the inner diameter of the O-ring groove on the inner wall of the part; a sleeve end face flange is provided on the rear end of the sleeve, and the sleeve end face flange is pressed against the front end of the core shaft end face flange, and the sleeve is limited by the core shaft end face flange. A raised block is provided on the inner cylindrical surface of the sleeve, and the block is provided in the limiting groove on the outer cylindrical surface of the core shaft. The block can move axially in the limiting groove, so that the distance that the sleeve moves axially on the outer surface of the core shaft is the width of the limiting groove, and a limiting flange is provided on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve, and the limiting flange cooperates with the outer side of the O-ring groove on the inner wall of the part to limit the position;

[0013] The positioning sleeve is a cylindrical hollow structure. The positioning sleeve is connected to the outside of the sleeve, and the positioning sleeve can slide axially on the outer surface of the sleeve. The front end of the positioning sleeve is provided with a front end face of the positioning sleeve that cooperates with the outer side of the O-ring groove on the inner wall of the part to limit the position. The outer cylindrical surface of the positioning sleeve is provided with a centering surface that slides with the inner hole of the part. The front end inner wall surface of the positioning sleeve is provided with a conical surface that cooperates with the upper limit flange on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve. The rear end of the positioning sleeve is provided with a positioning sleeve end face flange, which is pressed against the front end of the sleeve end face flange, and the positioning sleeve is limited by the sleeve end face flange.

[0014] Furthermore, the diameter of the O-ring groove is larger than the diameter of the O-ring.

[0015] Furthermore, the core shaft end face flange includes a rib and a gripper, and the rib is arranged at the front end of the gripper.

[0016] Furthermore, the five-claw thin-wall structure of the sleeve also includes five latching teeth evenly distributed along the circumference, which correspond one-to-one with the O-ring latching grooves on the core shaft to form an O-ring receiving cavity.

[0017] Furthermore, the core shaft, sleeve and positioning sleeve are made of soft materials with good elasticity.

[0018] Furthermore, the core shaft, the sleeve and the positioning sleeve are made of nylon material.

[0019] The assembly method of the deep hole O-ring assembly device comprises the following steps:

[0020] Step 1: Assemble the mandrel, sleeve, and locating sleeve coaxially from the inside out. Push the mandrel from the back to the front so that the mandrel end flange, sleeve end flange, and locating sleeve end flange are pressed together. At this point, the O-ring groove on the five-claw thin-wall structure at the front end of the mandrel is fully open.

[0021] Step 2: Slide the O-ring to be assembled onto the O-ring groove;

[0022] Step 3: Pull the mandrel backward at one end of the mandrel end flange. After the mandrel moves backward for a distance outside the sleeve, the block on the inner cylindrical surface of the sleeve contacts and stops at the front end of the limit groove on the outer cylindrical surface of the mandrel. At this time, the O-ring to be assembled is enclosed in the O-ring receiving cavity formed between the O-ring groove and the teeth of the five-claw thin-wall structure of the sleeve.

[0023] Step 4: Continue to pull the mandrel backward. Due to the action of the block, the mandrel will drive the sleeve to move toward the rear end until the upper limit flange on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve abuts against the conical surface on the inner wall of the front end of the positioning sleeve for braking. At this time, the conical surface on the inner wall of the positioning sleeve squeezes the O-ring receiving cavity, and the O-ring receiving cavity is compressed inward, thereby driving the O-ring to shrink inward into a five-pointed star shape.

[0024] Step 5: Insert the device with the O-ring installed into the inner hole of the part until the end face flange of the locating sleeve is in close contact with the rear end face of the part, and the front face of the locating sleeve is in close contact with the outer side of the O-ring groove on the inner wall of the part. During the insertion process, the centering surface on the outer cylindrical surface of the locating sleeve slides with the inner hole of the part to ensure that the device is concentric with the inner hole of the part.

[0025] Step 6: Push the sleeve toward the front end. The sleeve will drive the core shaft toward the front end of the inner hole of the part until the limit flange on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve fits against the outer side of the O-ring groove on the inner wall of the part.

[0026] Step 7: Push the mandrel from back to front. At this time, the five-claw thin-walled structure at the front end of the sleeve is limited by the outside of the O-ring groove on the inner wall of the part. The gap between the mandrel and the sleeve increases, and the O-ring groove at the front end of the mandrel continues to move toward the front end with the O-ring to be assembled. When the mandrel end flange is against the sleeve end flange, the O-ring groove on the mandrel five-claw thin-walled structure is exactly opposite to the O-ring groove on the inner wall of the part. At this time, due to the elasticity of the O-ring itself, the O-ring expands radially into the O-ring groove on the inner wall, completing the assembly of the O-ring.

[0027] Step 8: Pull the mandrel outward to remove the device from the deep hole in the part.

[0028] Furthermore, before executing the steps, grease or lubricating oil is applied to the surface of the O-ring to be assembled.

[0029] Beneficial effects of the present invention:

[0030] The present invention provides a deep-hole O-ring assembly device and assembly method. Compared with the existing technology, the O-ring can be installed into the specified groove conveniently, quickly and safely, which not only improves work efficiency and reduces assembly difficulty, but also avoids the hidden dangers of failure caused by damage to the O-ring during the assembly process that cannot be discovered in time.

[0031] The direct benefit of this device is to increase the assembly success rate, improve work efficiency, and reduce product production costs. The indirect benefit is to avoid O-ring damage caused by improper assembly or tool use that affects product use and function, reduce product maintenance costs, and improve product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a typical deep hole structure;

[0033] Figure 2 Schematic diagram of assembling an O-ring using a simple crochet hook;

[0034] Figure 3 A half-sectional view of a deep-hole O-ring assembly device according to the present invention;

[0035] Figure 4 This is a schematic diagram of the positioning sleeve structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the sleeve structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the core shaft structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the positional relationship of the core shaft, sleeve, and positioning sleeve after assembly of the present invention;

[0039] Figure 8 Schematic diagram of the O-ring being installed into the O-ring groove on the five-claw thin-wall structure at the front end of the mandrel;

[0040] Figure 9 A schematic diagram of the O-ring being assembled in the O-ring receiving cavity after the mandrel is pulled;

[0041] Figure 10 Schematic diagram of squeezing the O-ring in the O-ring receiving cavity after continuing to pull the mandrel;

[0042] Figure 11 This is a schematic diagram of the position of the device of the present invention extending into the deep hole of a part;

[0043] Figure 12 To push the sleeve forward, the limiting flange on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve 2 fits against the outer side of the O-ring groove on the inner wall of the part.

[0044] Figure 13 This is a schematic diagram showing the correspondence between the O-ring groove position on the five-jaw thin-wall structure of the mandrel and the O-ring groove position on the inner wall of the part;

[0045] Figure 14 Schematic diagram of the O-ring installed in the O-ring groove on the inner wall of the part;

[0046] Figure 15 A schematic diagram of the process of removing the device of the present invention;

[0047] in,

[0048] 1: core shaft, 1-1: O-ring groove, 1-2: core shaft end flange, 1-3: limit groove, 1-4: rib, 1-5: gripper;

[0049] 2: sleeve, 2-1: sleeve end face flange, 2-2: clamping block, 2-3: limit flange;

[0050] 3: Positioning sleeve, 3-1: Front end face of positioning sleeve, 3-2: Centering surface, 3-3: Conical surface, 3-4: End face flange of positioning sleeve. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0052] like Figure 3 FIG. 1 shows an embodiment of a deep-hole O-ring assembly device provided by the present invention, comprising a core shaft 1, a sleeve 2, and a positioning sleeve 3. The core shaft 1, sleeve 2, and positioning sleeve 3 are coaxially arranged in sequence from the inside to the outside, wherein:

[0053] The core shaft 1 is a cylindrical hollow structure, with a five-claw thin-walled structure with good elasticity at the front end. An O-ring groove 1-1 is provided on the five-claw thin-walled structure, and a core shaft end face flange 1-2 is provided at the rear end. A limit groove 1-3 is provided on the outer cylindrical surface of the core shaft 1;

[0054] The sleeve 2 is a cylindrical hollow structure. The sleeve 2 is sleeved on the outside of the core shaft 1, and the sleeve 2 can slide along the axial direction of the outer surface of the core shaft 1. The front end of the sleeve 2 is a five-claw thin-walled structure with good elasticity, which cooperates with the O-ring groove 1-1 on the five-claw thin-walled structure on the front end of the core shaft 1 to form an O-ring receiving cavity. The outer diameter of the O-ring receiving cavity is smaller than the inner diameter of the O-ring groove on the inner wall of the part; a sleeve end face flange 2-1 is provided at the rear end of the sleeve 2, and the sleeve end face flange 2-1 is pressed against the front end of the core shaft end face flange 1-2, relying on the core shaft end face method The flange 1-2 limits the sleeve 2. A raised block 2-2 is provided on the inner cylindrical surface of the sleeve 2. The block 2-2 is provided in the limiting groove 1-3 on the outer cylindrical surface of the core shaft 1. The block 2-2 can move axially in the limiting groove 1-3, so that the distance that the sleeve 2 moves axially on the outer surface of the core shaft 1 is the width of the limiting groove 1-3. A limiting flange 2-3 is provided on the outer cylindrical surface of the five-claw thin-wall structure at the front end of the sleeve 2. The limiting flange 2-3 cooperates with the outer side of the O-ring groove on the inner wall of the part to limit the position;

[0055] The positioning sleeve 3 is a cylindrical hollow structure. The positioning sleeve 3 is sleeved on the outside of the sleeve 2, and the positioning sleeve 3 can slide axially on the outer surface of the sleeve 2. The front end of the positioning sleeve 3 is provided with a positioning sleeve front end face 3-1 that cooperates with the outer side of the O-ring groove on the inner wall of the part to limit the position. The outer cylindrical surface of the positioning sleeve 3 is provided with a centering surface 3-2 that slides with the inner hole of the part. The inner wall surface of the front end of the positioning sleeve 3 is provided with a conical surface 3-3 that cooperates with the upper limit flange 2-3 of the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve 2. The rear end of the positioning sleeve 3 is provided with a positioning sleeve end face flange 3-4, which is pressed against the front end of the sleeve end face flange 2-1, and the positioning sleeve 3 is limited by the sleeve end face flange 2-1.

[0056] In the present invention, the diameter of the O-ring groove 1-1 is larger than the diameter of the O-ring, which can ensure that when the O-ring to be assembled is installed in the O-ring groove 1-1 of the core shaft 1, the O-ring is fixed in the O-ring groove 1-1 by relying on the radial tension of the O-ring groove 1-1 and will not fall out.

[0057] In the present invention, the core shaft end face flange 1-2 includes a rib 1-4 and a gripper 1-5, and the rib 1-4 is arranged at the front end of the gripper 1-5 to facilitate positioning and operation.

[0058] In the present invention, the five-claw thin-walled structure of the sleeve 2 also includes five latching teeth evenly distributed along the circumference, which correspond one-to-one with the O-ring latching groove 1-1 on the core shaft 1, that is, the latching teeth of the five-claw thin-walled structure of the sleeve 2 fit on the outer edge end face of the O-ring latching groove 1-1 to form an O-ring receiving cavity, further preventing the O-ring from falling off the core shaft 1.

[0059] In the present invention, the core shaft 1, sleeve 2 and positioning sleeve 3 are made of soft materials with good elastic properties, preferably nylon materials. In the present invention, when assembling the O-ring, the three components need to undergo different degrees of deformation. Therefore, the three components need to be soft in texture. Therefore, using nylon materials can achieve the purpose of deformation.

[0060] Another embodiment of the present invention is a method for assembling a deep hole O-ring assembly device, comprising the following steps:

[0061] Step 1: Assemble the core shaft 1, sleeve 2, and positioning sleeve 3 coaxially from the inside out. Push the core shaft 1 from the back to the front so that the core shaft end flange 1-2, sleeve end flange 2-1, and positioning sleeve end flange 3-4 are pressed together. At this time, the O-ring groove 1-1 on the five-claw thin-wall structure at the front end of the core shaft 1 is in a fully open state.

[0062] Step 2: Slip the O-ring to be assembled onto the O-ring groove 1-1;

[0063] Step 3: Pull the core shaft 1 backward at one end of the core shaft end face flange 1-2. After the core shaft 1 moves backward for a distance outside the sleeve 2, the clamping block 2-2 on the inner cylindrical surface of the sleeve 2 contacts and limits the front end of the limit groove 1-3 on the outer cylindrical surface of the core shaft 1. At this time, the O-ring to be assembled is enclosed in the O-ring receiving cavity formed between the O-ring groove 1-1 and the clamping teeth of the five-claw thin-wall structure of the sleeve 2;

[0064] Step 4: Continue to pull the core shaft 1 backward. Due to the action of the clamping block 2-2, the core shaft 1 will drive the sleeve 2 to move toward the rear end until the upper limit flange 2-3 on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve 2 abuts against the conical surface 3-3 on the inner wall of the front end of the positioning sleeve 3 for braking. At this time, the conical surface 3-3 on the inner wall of the positioning sleeve 3 squeezes the O-ring receiving cavity, and the O-ring receiving cavity is compressed inward, thereby driving the O-ring to shrink inward into a five-pointed star shape.

[0065] Step 5: Insert the device with the O-ring installed into the inner hole of the part until the end face flange 3-4 of the positioning sleeve is in close contact with the rear end face of the part, and the front face 3-1 of the positioning sleeve is in close contact with the outer side of the O-ring groove on the inner wall of the part. During the insertion process, the centering surface 3-2 on the outer cylindrical surface of the positioning sleeve 3 slides with the inner hole of the part to ensure that the device is concentric with the inner hole of the part;

[0066] Step 6: Push the sleeve 2 toward the front end. At this time, the sleeve 2 will drive the core shaft 1 to move toward the front end of the inner hole of the part until the limit flange 2-3 on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve 2 fits against the outer side of the O-ring groove on the inner wall of the part;

[0067] Step 7: Push the mandrel 1 from the back to the front. At this time, the five-claw thin-walled structure at the front end of the sleeve 2 is limited by the outside of the O-ring groove on the inner wall of the part. The gap between the mandrel 1 and the sleeve 2 increases, and the O-ring groove 1-1 at the front end of the mandrel 1 continues to move toward the front end with the O-ring to be assembled. When the mandrel end face flange 1-2 is abutted against the sleeve end face flange 2-1, the O-ring groove 1-1 on the five-claw thin-walled structure of the mandrel 1 is exactly opposite to the O-ring groove on the inner wall of the part. At this time, due to the elasticity of the O-ring itself, the O-ring expands radially into the O-ring groove on the inner wall, completing the assembly of the O-ring.

[0068] Step 8: Pull the mandrel 1 outward to remove the device from the deep hole of the part.

[0069] In the present invention, before executing step 2, grease or lubricating oil is applied to the surface of the O-ring to be assembled, which can prevent the O-ring from getting stuck in the O-ring groove 1-1 on the five-claw thin-walled structure of the core shaft 1, resulting in the O-ring groove 1-1 on the five-claw thin-walled structure of the core shaft 1 being relative to the O-ring groove on the inner wall of the part, and the O-ring cannot be ejected from the O-ring groove 1-1 after being deformed.

[0070] The third embodiment of the present invention is: a deep hole O-ring assembly device, including a core shaft 1, a sleeve 2 and a positioning sleeve 3. The core shaft 1 is the innermost part, and the front end is a five-claw thin-walled structure with good elasticity; the rear end is a complete annular body, which can play a supporting and guiding role. The outer end of the rear side is provided with a rib 1-4 and a gripper 1-5 to facilitate positioning and operation. The positioning sleeve 3 is the outermost part, and the whole is a circular ring body. When used, it extends into the inner hole of the part to be assembled to play a positioning role. The sleeve 2 is clamped between the core shaft 1 and the positioning sleeve 3. Its overall structure is similar to that of the core shaft 1. The front end is a five-claw thin-walled structure, and the rear end is a complete annular body, which is used to protect and guide the O-ring.

[0071] A fourth embodiment of the present invention is a method for assembling a deep hole O-ring assembly device, comprising the following steps:

[0072] ①Press the device Figure 3 When assembled, the five claws on the core shaft 1 correspond to the five claws on the sleeve 2, and slide rails can be set at the corresponding angular directions of the claws to avoid misalignment.

[0073] ② Push the core shaft 1 by hand to make the rear end flanges of the core shaft 1, sleeve 2 and positioning sleeve 3 close together. Figure 7 .

[0074] At this time, the O-ring groove 1-1 on the core shaft 1 is in a fully open state. Due to the effect of elasticity, the five-claw thin-walled structure at the front end of the core shaft 1 expands radially, making the bottom diameter of the O-ring groove 1-1 slightly larger than the inner diameter of the O-ring to be assembled.

[0075] ③Put the O-ring with grease or lubricating oil on the O-ring groove 1-1 of the core shaft 1. Figure 8 .

[0076] The elasticity of the thin-walled structure of the five prongs at the front end of the mandrel 1 secures the O-ring in the O-ring slot 1-1 to prevent it from loosening or falling out. Since the mandrel 1 is relatively thin, the outward expansion force is not large, so the O-ring will not be stretched too much or twisted.

[0077] ④Pull the core shaft 1 toward the rear end. Figure 9 .

[0078] When the core shaft 1 moves a short distance toward the rear end outside the sleeve 2, the raised block 2-2 on the sleeve 2 contacts the front end surface of the limit groove 1-3 on the core shaft 1. At this time, the O-ring is sealed in the storage cavity formed by the core shaft 1 and the sleeve 2 and cannot escape.

[0079] ⑤ Continue to pull the core shaft 1 toward the rear end. Figure 10 .

[0080] Due to the action of the clamping block 2-2, the core shaft 1 will drive the sleeve 2 toward the rear end until the upper limit flange 2-3 of the sleeve 2 abuts against the tapered surface 3-3 on the front end of the positioning sleeve 3, braking the sleeve 2. At this point, due to the tapered surface 3-3 on the inner wall of the positioning sleeve 3, the O-ring receiving cavity formed by the core shaft 1 and the five claws on the sleeve 2 is compressed toward the center of the O-ring, thus causing the O-ring to shrink toward the center, forming a five-pointed star shape. If the O-ring is too thick or too thin, causing distortion, a slight adjustment can be made. At this point, the outer diameter of the O-ring receiving cavity formed by the core shaft 1 and sleeve 2, which encloses the O-ring, is smaller than the diameter of the deep-hole O-ring groove in the component.

[0081] ⑥ In this state, extend the device of the present invention into the inner hole / deep hole of the part to be assembled until the end face flange 3-4 of the positioning sleeve is in close contact with the rear end face of the part, and the front face 3-1 of the positioning sleeve is in close contact with the outer side of the O-ring groove on the inner wall of the part to limit the position. During the deepening process, the centering surface 3-2 on the outer cylindrical surface of the positioning sleeve 3 slides with the inner hole of the part to ensure that the device is concentric with the inner hole of the part. See attached Figure 11 .

[0082] Since the O-ring has been compressed and the outer diameter of the sleeve 2 is smaller than the diameter of the deep hole O-ring groove, no interference or damage will occur during the process of extending into the inner hole.

[0083] Be careful not to push the core shaft 1 or sleeve 2 when pushing the positioning sleeve 3 inward.

[0084] ⑦ Push the sleeve 2 toward the front end until the limit flange 2-3 on the outer cylindrical surface of the front five-claw thin-walled structure is stuck on the edge of the O-ring groove on the inner wall of the part. Figure 12 .

[0085] At this time, the sleeve 2 will drive the core shaft 1 to move toward the front end. When the limiting flange 2-3 on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve 2 is stuck at the edge of the O-ring groove, the front end of the sleeve 2 is just located at the edge of the O-ring groove, avoiding blocking the O-ring groove 1-1 on the core shaft 1.

[0086] ⑧Finally, push the core shaft 1 until the core shaft end face flange 1-2 abuts against the sleeve end face flange 2-1 and brakes. Figure 13 .

[0087] The O-ring receiving cavity formed by the core shaft 1 and the sleeve 2 moves toward the front end, and the gap between the core shaft 1 and the sleeve 2 increases. When the rib 1-4 at the rear end of the core shaft 1 is against the sleeve end face flange 2-1, the O-ring receiving cavity is exactly opposite to the O-ring groove on the inner wall of the part. At this time, due to the elasticity of the O-ring itself, the O-ring expands radially from the O-ring receiving cavity into the O-ring groove of the part.

[0088] Since the compression and expansion release of the rubber ring are all carried out within one cross section, it will not cause the O-ring torsional deformation.

[0089] ⑨Finally, pull the core shaft 1 outwards to remove the device from the deep hole. Figure 14 、 15 .

[0090] At this time, since the O-ring is already released into the groove of the component, it will not be pulled out with the device. In addition, the front end of the device will also expand the O-ring outward into the component groove during the retraction process, further straightening the O-ring and avoiding local bending and deformation.

[0091] The key innovations of the present invention are as follows:

[0092] 1. The specific structure of the device is mainly composed of three parts: a positioning sleeve 3, a sleeve 2, and a core shaft 1. The structure is simple and the operation is convenient and fast.

[0093] 2. This device changes the installation of the O-ring from the deep hole installation to the installation outside the hole, making the operation extremely convenient and simplified.

[0094] 3. This device can shrink the O-ring inside the device, making it easy to insert into the inner hole.

[0095] Due to the need for sealing and assembly, the diameter of the O-ring is generally larger than the minor diameter of the inner groove, which also brings inconvenience in operation. This device can shrink the O-ring inside the device, making it easy to put it into the inner hole.

[0096] 4. This device can shrink the O-ring inside the device to protect the O-ring from scratches.

[0097] For sealing and assembly needs, the diameter of the O-ring is generally larger than the minor diameter of the inner groove. This device can achieve the contraction of the O-ring inside the device without causing scratches or damage.

[0098] 5. After reaching the designated position, the device can release the O-ring and fill it into the designated groove by relying on its own elasticity. No external force is applied to the O-ring, so it will not be damaged.

[0099] 6. The device shrinks and releases the O-ring at the same cross section, which can avoid the O-ring from twisting and deforming, thereby affecting the sealing effect.

[0100] O-ring seals are a common static sealing structure. Due to the presence of stretching / compression of the O-ring, conventional installation cannot avoid friction and distortion of the O-ring on the installed shaft / hole. Therefore, it must be straightened after assembly, which is difficult to achieve for O-rings with deep inner holes.

[0101] The device is designed with this in mind and will not allow the O-ring to slip and therefore twist when it is retracted or released.

[0102] 7. The device is equipped with a stop structure on each component, which can limit the relative position between the components to realize the entry and exit of the O-ring, and accurately position it to the specified groove after inserting it into the deep hole. No personnel assistance or observation is required to avoid misalignment and achieve accurate release.

[0103] 8. The device is made of soft and elastic materials such as nylon, which can realize the contraction, protection and release of the O-ring without damaging the O-ring.

[0104] 9. The device has a simple structure and is easy to operate. It does not require overly professional and skilled fitter skills. Even unfamiliar operators can operate it correctly after a brief familiarization.

[0105] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A deep hole O-ring assembly device, characterized in that: It includes a core shaft, a sleeve and a positioning sleeve, which are coaxially arranged from the inside to the outside, wherein: The core shaft is a cylindrical hollow structure, with a five-claw thin-walled structure with good elasticity at the front end, an O-ring groove provided on the five-claw thin-walled structure, a core shaft end face flange provided at the rear end, and a limit groove provided on the outer cylindrical surface of the core shaft; The sleeve is a cylindrical hollow structure, the sleeve is sleeved on the outside of the core shaft, and the sleeve can slide axially on the outer surface of the core shaft. The front end of the sleeve is a five-claw thin-walled structure with good elasticity, which cooperates with the O-ring groove on the five-claw thin-walled structure at the front end of the core shaft to form an O-ring receiving cavity, and the outer diameter of the O-ring receiving cavity is smaller than the inner diameter of the O-ring groove on the inner wall of the part; a sleeve end face flange is provided on the rear end of the sleeve, and the sleeve end face flange is pressed against the front end of the core shaft end face flange, and the sleeve is limited by the core shaft end face flange. A raised block is provided on the inner cylindrical surface of the sleeve, and the block is provided in the limiting groove on the outer cylindrical surface of the core shaft. The block can move axially in the limiting groove, so that the distance that the sleeve moves axially on the outer surface of the core shaft is the width of the limiting groove, and a limiting flange is provided on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve, and the limiting flange cooperates with the outer side of the O-ring groove on the inner wall of the part to limit the position; The positioning sleeve is a cylindrical hollow structure. The positioning sleeve is connected to the outside of the sleeve, and the positioning sleeve can slide axially on the outer surface of the sleeve. The front end of the positioning sleeve is provided with a front end face of the positioning sleeve that cooperates with the outer side of the O-ring groove on the inner wall of the part to limit the position. The outer cylindrical surface of the positioning sleeve is provided with a centering surface that slides with the inner hole of the part. The front end inner wall surface of the positioning sleeve is provided with a conical surface that cooperates with the upper limit flange on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve. The rear end of the positioning sleeve is provided with a positioning sleeve end face flange, which is pressed against the front end of the sleeve end face flange, and the positioning sleeve is limited by the sleeve end face flange.

2. A deep hole O-ring assembly device according to claim 1, characterized in that: The diameter of the O-ring groove is larger than the diameter of the O-ring.

3. The deep hole O-ring assembly device according to claim 1, characterized in that: The core shaft end face flange includes a rib and a gripper, and the rib is arranged at the front end of the gripper.

4. A deep hole O-ring assembly device according to claim 3, characterized in that: The five-claw thin-wall structure of the sleeve also includes five latching teeth evenly distributed along the circumference, which correspond one-to-one with the O-ring latching grooves on the core shaft to form an O-ring receiving cavity.

5. The deep hole O-ring assembly device according to claim 1, characterized in that: The core shaft, sleeve and positioning sleeve are made of soft materials with good elasticity.

6. A deep hole O-ring assembly device according to claim 5, characterized in that: The core shaft, sleeve and positioning sleeve are made of nylon material.

7. The assembly method of the deep hole O-ring assembly device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Assemble the mandrel, sleeve, and locating sleeve coaxially from the inside out. Push the mandrel from the back to the front so that the mandrel end flange, sleeve end flange, and locating sleeve end flange are pressed together. At this point, the O-ring groove on the five-claw thin-wall structure at the front end of the mandrel is fully open. Step 2: Slide the O-ring to be assembled onto the O-ring groove; Step 3: Pull the mandrel backward at one end of the mandrel end flange. After the mandrel moves backward for a distance outside the sleeve, the block on the inner cylindrical surface of the sleeve contacts and stops at the front end of the limit groove on the outer cylindrical surface of the mandrel. At this time, the O-ring to be assembled is enclosed in the O-ring receiving cavity formed between the O-ring groove and the teeth of the five-claw thin-wall structure of the sleeve. Step 4: Continue to pull the mandrel backward. Due to the action of the block, the mandrel will drive the sleeve to move toward the rear end until the upper limit flange on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve abuts against the conical surface on the inner wall of the front end of the positioning sleeve for braking. At this time, the conical surface on the inner wall of the positioning sleeve squeezes the O-ring receiving cavity, and the O-ring receiving cavity is compressed inward, thereby driving the O-ring to shrink inward into a five-pointed star shape. Step 5: Insert the device with the O-ring installed into the inner hole of the part until the end face flange of the locating sleeve is in close contact with the rear end face of the part, and the front face of the locating sleeve is in close contact with the outer side of the O-ring groove on the inner wall of the part. During the insertion process, the centering surface on the outer cylindrical surface of the locating sleeve slides with the inner hole of the part to ensure that the device is concentric with the inner hole of the part. Step 6: Push the sleeve toward the front end. The sleeve will drive the core shaft toward the front end of the inner hole of the part until the limit flange on the outer cylindrical surface of the five-claw thin-walled structure at the front end of the sleeve fits against the outer side of the O-ring groove on the inner wall of the part. Step 7: Push the mandrel from back to front. At this time, the five-claw thin-walled structure at the front end of the sleeve is limited by the outside of the O-ring groove on the inner wall of the part. The gap between the mandrel and the sleeve increases, and the O-ring groove at the front end of the mandrel continues to move toward the front end with the O-ring to be assembled. When the mandrel end flange is against the sleeve end flange, the O-ring groove on the mandrel five-claw thin-walled structure is exactly opposite to the O-ring groove on the inner wall of the part. At this time, due to the elasticity of the O-ring itself, the O-ring expands radially into the O-ring groove on the inner wall, completing the assembly of the O-ring. Step 8: Pull the mandrel outward to remove the device from the deep hole in the part.

8. The assembly method according to claim 7, characterized in that: Before proceeding to step 2, apply grease or oil to the surface of the O-ring to be assembled.

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