JP6209761B1 - Front fork oil seal changer by bonding - Google Patents

Abstract

[PROBLEMS] To replace an oil seal used for a front fork of a motorcycle is accompanied by a disassembling work and requires specialized knowledge or a waste oil facility. Since it is difficult to remove with a ring-shaped oil seal installed in a deep place, a device that can be easily removed was required. The present invention has been considered that it can be used for removal by adhering a cylindrical tip for removal to the outer surface of an oil seal of a front fork. Since the adhesive force is insufficient in normal bonding, the fixing block is attached to the inner pipe, and the oil seal can be removed as a strong bond by applying pressure to the bonding surface using the screw of the exchange device. [Selection] Figure 1

Description

The present invention relates to a front fork oil seal replacement device that facilitates an operation of replacing an oil seal of a front fork used in a motorcycle.

In many motorcycles, a suspension system called a telescopic type composed of an inner pipe and an outer tube is used for a front wheel as a shock absorber. The inner pipe and the outer tube are filled with oil, and an oil seal is fitted to the outer tube in order to prevent leakage to the outside.

However, if the oil seal deteriorates due to increased mileage or aging, etc., oil leakage will occur and oil will adhere to the brake disc, causing safety problems, and oil leakage will reduce the market value. The seal replacement work is frequently performed.

The oil seal of the front fork uses a ring-shaped object with a small outer diameter and a larger inner diameter due to an inner pipe that has been increased in diameter to increase strength and an outer tube that has been reduced in diameter to emphasize controllability. There are many cases. In the ring shape, it is often attached slightly from the end surface of the outer tube, and the fork oil seal is generally replaced by disassembling the inner pipe and the outer tube.

As a prior art document, the following is published when searching by international patent classification B25B 27/14 or the like. In Patent Document 1, a hole is formed on the outside of an oil seal and removed, and it is difficult to use a ring-shaped oil seal. In Patent Document 2, an instrument is inserted into a lip portion of an oil seal, and the shaft is damaged and there is a possibility of oil leakage, so that the oil seal is not used. Further, the lip portion is deepened by a double lip or the like as in the oil seal, and the insertion itself is difficult. The present invention does not insert into the lip portion but utilizes the outer surface of the oil seal and is completely different from Patent Document 2. The present invention can be removed without making a hole on the outside or scratching the lip. This is to maintain the function of the oil seal even after removal, and the analysis and reuse of the oil seal is possible, which is completely different from Patent Document 1 and Patent Document 2 in which the oil seal is deformed or opened at the time of removal.

JP 2006-15473 A JP 2000-167778 A

The problem to be solved is to develop a device that replaces the front fork oil seal without disassembling the front fork. There is a demand for shortening the working time, reducing the number of fork oils and replacement parts, reducing the burden on the user, and improving safety.

The oil seal of the front fork may collect rainwater and water during car washing, and the metal inside the oil seal may corrode. In such a case, an apparatus that can replace the oil seal without disassembling is desired.

In the present invention, in order to remove the oil seal of the front fork by attaching a cylindrical tip that matches the shape of the outer surface of the oil seal, it is fixed by applying pressure to the adhesion for a certain period of time. It is necessary to make the adhesive strength strong. Therefore, as a means, a fixed block is attached to the inner pipe of the front fork, and the oil seal and the cylindrical tip are bonded by applying pressure to the oil seal using the screw portion of the oil seal changer. If strong bonding can be achieved, the threaded portion of the oil seal changer is used to pull out and remove the cylindrical tip, and a new oil seal is driven using the protective pipe to complete the operation.

The front fork oil seal replacement device according to the present invention performs oil seal replacement without disassembling, and has an effect of shortening the replacement time. Even when the bolt for disassembling cannot be disassembled due to corrosion or the like, the oil seal can be removed. There is also an effect that can be exchanged. An impact wrench is generally used for disassembling the front fork, but there are problems such as noise. Since the present invention can be removed manually, it can be replaced even at midnight in a residential area.

Oil seal changer by adhesion and oil seal perspective view Oil seal changer by bonding and oil seal cross section Oil seal changer and oil seal perspective view Cross section of oil seal changer and oil seal Enlarged cross-sectional view of the tip of the main unit when the oil seal is removed Double lip oil seal perspective view A and cross section B and cylindrical cross section C Single-lip oil seal perspective view D and sectional view E and cylindrical tip sectional view F Perspective view G and sectional view H of the peeled double lip oil seal and sectional view J of the cylindrical tip Front fork dust seal cross section Perspective view with replacement oil seal installed Perspective view of outer side cutter and oil seal Enlarged cross section of outer side cutter and oil seal Oil seal changer by adhesion and oil seal image Disassembled image of oil seal changer Oil seal changer image Image when oil seal for replacement is installed Image of outer peripheral side cutter and oil seal Image when using the outer side cutter Side image of the outer circumference of the removed oil seal using the outer side cutter

FIG. 1 is a perspective view of an oil seal exchange device by adhesion and an oil seal. The main body (1) of the oil seal exchange device having a helical tip (7) whose cylindrical tip (5) can be attached and detached with a screw, and a female screw that fits into the male screw (12) for removing the main body. An oil seal changer and an adhesive (25) comprising a protective pipe (3) for protecting the removal handle (2), the inner pipe (10), and a fixing block (23) are prepared. The front fork is set upright and fixed, and the dust seal (FIGS. 9 and 28) and the clip for preventing removal (FIGS. 9 and 29) are removed. The oil and fat on the outer surface of the oil seal is degreased with an organic solvent or the like. If an oil seal for replacement is not installed immediately after removing the oil seal, the internal pressure may increase due to temperature changes and the oil may overflow, so prepare a replacement oil seal with silicon grease applied to the lip.

The embodiment will be described with reference to the accompanying drawings. Remove the front fork from the motorcycle so that the lower part cannot be grasped with a vice. Remove the front fork dust seal (Figs. 9 and 28) and removal prevention clip (Figs. 9 and 29). Check if the main body (1) removal handle (2) protective pipe (3) is normal or damaged. Silicone grease is applied to the lip portion of the replacement oil seal (FIGS. 10 and 22). In this specification, the outer surface of the oil seal is an outer surface perpendicular to the central axis and is a directly visible part of the oil seal, and the outer peripheral side is an outer peripheral surface parallel to the central axis. A part that cannot be seen unless it is removed.

1 is a perspective view of an oil seal exchange device by adhesion and an oil seal perspective view. The oil seal (4) and the outer tube (11) are separated from each other for easy understanding. The oil seal (4) is fitted to the outer tube (11) as shown in the sectional view of the device and the oil seal. In order to bond and remove the oil seal (4) and the cylindrical tip (5), the outer surface of the oil seal (4) is degreased, washed and dried (see FIG. 6, 38) is applied with an adhesive (25) and passed through the inner pipe (10), and then the protective pipe body insertion portion of the protective pipe (3) finished with the outer diameter of the inner pipe (10) (FIG. 3, 13) is inserted into the main body (1), and the replacement device main body with the removal handle (2) located at the center of the male screw (12) for removal is moved from the protective pipe (3) side to the inner pipe (10). The fixing screw (24) of the fixing block (23) is tightened and fixed at a position where it is pressed through the fixing block (23) to the spiral tip (FIGS. 3 and 7) of the main body (1). The removal handle (2) attached to the main body (1) is rotated in a loosening direction to press the end face of the bearing plate (27) against the fixed block (23). Further, the pressure is applied to the joint surface between the oil seal (4) and the cylindrical tip (5) to strengthen the adhesion. A thrust bearing (26) is installed between the removal handle (2) and the bearing plate (27) to prevent the body from rotating. When it is confirmed that the adhesive (25) has been cured, the removal handle (2) is rotated in the tightening direction to pull the bearing plate (27) away from the fixed block (23). The fixing screw (24) of the fixing block (23) is loosened and removed from the inner pipe (10). Even if the adhesive (25) applied to the joint surface of the cylindrical tip (5) with a finger or the like is pressed against the oil seal (4), it can be bonded but cannot be evenly pressurized or held for a long time. Therefore, the adhesive strength becomes weak and the possibility of peeling when the oil seal (4) is pulled out is high.

The removal of the oil seal will be described with reference to the drawings. 3 is a perspective view of the oil seal replacement device and the oil seal, FIG. 4 is a cross-sectional view of the oil seal replacement device and the oil seal, and FIG. 5 is an enlarged cross-sectional view of the front end of the main body when the oil seal is removed. As shown in FIG. 3, the oil seal is removed in a state where the exchange device main body (1) and the protective pipe (3) are reversed from the time of bonding. The oil seal exchange device is composed of a main body (1), a removal handle (2), a protective pipe (3), a cylindrical tip (5), and a fixing block (FIGS. 2 and 23) used for bonding. The main body (1) has a cylindrical shape, and has a helical tip (7) at the tip, allowing the replacement of the cylindrical tip (5) to match the shape of the oil seal outer surface (14). A male screw (12) for removal is provided at the center of (1) and is fitted to a female screw of the removal handle (2). The oil seal (4) is removed, the oil seal (4) and a cylindrical tip. The upper part used for bonding the part (5) has a main body handle (6) for fixing the helical tip (7) and the cylindrical tip (5) with screws. The removal handle (2) is cylindrical, has a female screw on the inside, and has a thrust bearing (26) and a bearing plate (27) on the lower end surface. The thrust bearing (26) and the bearing plate (27) are the main body (1 Is required to be pulled straight up with a small force and to prevent lateral force from being applied to the bonding surface. The protective pipe (3) is made of resin to prevent the inner pipe (10) from being damaged because the main body (1) is made of metal, and has a protective pipe main body insertion portion (13) at the lower part and is protected at the upper part. It has a pipe oil seal driving part (15).

3, 4, and 5, after confirming that the adhesive is cured, the body (1), the removal handle (2), and the protective pipe (3) are reversed and inserted into the inner pipe (10). Since the spiral tip (7) of the main body is a right screw, the main body handle (6) is rotated to the right to rotate the spiral tip (7) and a cylindrical tip (5 ). There is no need to tighten to the end, and an extra pressure in the rotational direction is applied to prevent the adhesive surface from peeling off. Since the removal screw (12) of the main body is a right-hand screw, the removal handle (2) is rotated clockwise to press the bearing plate (27) against the end surface of the outer tube (11), and further, the removal handle (2) is rotated clockwise. The oil seal (4) bonded to the main body (1) and the cylindrical tip (5) moves upward and can be removed by pulling. Although it is necessary to hold down the main body handle (6) so as not to rotate, the main body handle (6) is difficult to rotate when the thrust bearing (26) is installed at the lower part of the removal handle (2). The main body (1) is removed from the inner pipe (10), and the cylindrical tip (5) is removed from the main body (1). The oil seal outer surface (15) bonded to the cylindrical tip (5) can be separated by inserting the tip of a cutter knife or screwdriver into the bonding surface, and the adhesive (25) can be removed and reused. It becomes.

6, 7, and 8 are oil seals used in a front fork. For oil seal replacement by adhesion, a cylindrical tip (5) that matches the shape of the oil seal outer surface (14) should be prepared. is necessary. The double lip oil seal (16) has a cylindrical shape (19) for a stepped double lip oil seal, and the single lip oil seal (17) is a cylindrical shape for a flat single lip oil seal. What prepared (20) is prepared and the adhesive (25) prepares what adhere | attaches a metal and a rubber material (8). In the oil seal in which the oil seal is corroded and the rubber is peeled off, the rubber on the outer surface is removed, the rubber layer (8) is peeled off, and the inner metal core (9) is exposed on the surface and peeled off. ) And a cylindrical shape (21) for the oil seal of the peeled double lip that matches the shape of the iron core (9) is prepared, and the adhesive (25) bonds the metal and the metal of the iron core (9). Prepare things. Each cylindrical shape is attached as a cylindrical tip (5) to the spiral tip (7) of the main body (FIGS. 4 and 1) with a screw and can be exchanged.

FIG. 10 is a perspective view when the replacement oil seal is attached. Pass the replacement oil seal (22) through the inner pipe (10) and hold the main body handle (6) of the main body (1) with the protective pipe oil seal driving portion (15) of the protective pipe (3) facing downward. The protective pipe (3) driven into the tube (11) is made of resin or the like to prevent scratches. The protective pipe has an inner diameter of the main body (1) and an outer diameter of the inner pipe (10), and a protective pipe main body insertion portion (FIGS. 3 and 13) can be inserted into the main body (FIGS. 3 and 1). A protective pipe oil seal driving portion (15) having a shape capable of driving the oil seal in accordance with the inner diameter and outer diameter of the oil seal and the mounting depth is provided.

When the replacement oil seal (FIGS. 10 and 22) is driven, the drop prevention clip (FIGS. 9 and 29) is attached to the drop prevention clip groove (FIGS. 9 and 30) and the dust seal (FIGS. 9 and 28) is attached. Replacement work is completed. Attach the front fork to the motorcycle. FIG. 9 is a sectional view showing the positional relationship between the dust seal (28) and the slip-off prevention clip (29) in the front fork. A slip prevention clip (29) is fitted in the slip prevention clip groove (30) so that the oil seal (4) does not slip out of the outer tube (11). A dust seal (28) is attached between the inner pipe (10) and the oil seal (4) so that water and dust do not enter. The oil seal (4) in FIG. 9 is in a state before replacement, and is a replacement oil seal (22) after replacement. Although the dust seal (28) and the slip-off preventing clip (29) are described in the specification, the slip-off preventing clip groove (30) is omitted in the cross-sectional view of the oil seal exchange device because it can be easily removed. In the specification, the inner pipe (10) and the outer tube (11) may be called an inner tube, a fork tube, a fork pipe, a bottom case, or an outer pipe. As described.

As a modified example 1, before the oil seal changer is used, the pretreatment is performed as follows, so that the exchange operation can be performed more efficiently. FIGS. 11 and 12 show a cylindrical side surface having the same diameter as the outer diameter of the oil seal. The outer peripheral side cutter (31) with the blade attached is passed through the inner pipe (10), the cutter handle (35) is rotated, and the rubber on the outer peripheral side of the oil seal is cut to facilitate the removal of the oil seal. It is. A groove having the same diameter as the outer diameter of the oil seal is created on the outer peripheral side surface of the cylindrical resin, and a commercially available double-blade type cutter replacement blade (32) is fixed with a cutter fixing screw (33) so that it can be easily rotated. Attach the cutter handle (35) to the top. The number of cutter replacement blades (32) is plural, and a pair or two pairs can be stably cut without tilting. In FIG. 11, four cutter blades (32) are used, but in FIG. The outer cutter (31) rotates around the inner pipe (10) and the cutter replacement blade (32) is thin and bent so that the cutting edge can be rotated along the inner diameter of the outer tube (11), and the outer periphery of the oil seal It becomes possible to cut off the rubber of (36). Since the cutting edge is double-edged, it is possible to cut only the rubber without damaging the aluminum material on the inner surface of the outer tube (11). After a few rotations, the chips rise to the upper surface of the oil seal, so the oil seal must be replaced after cleaning. This is because the cut rubber fits into the slip-out prevention clip groove (Figs. 9 and 30). This is to prevent this from happening. For reference, the thickness of the cutter replacement blade (32) is 0.4 mm, and the rubber thickness of the oil seal outer peripheral portion (36) is about 0.6 to 0.8 mm. A large adhesive force is required to remove the oil seal that has been cured due to aging, etc., but by using this outer peripheral side cutter, the oil seal can be removed even if the adhesive force is small. The hardened oil seal can be cut efficiently by dripping acetone or the like and using an outer peripheral side cutter.

When the present invention is used in an industrial machine that uses a lot of oil seals, the oil seal can be replaced by this apparatus without damaging the shaft, and maintenance is facilitated in the industrial machine. Since it is not exchanged by disassembling work, special knowledge and skills are not necessary, so it is expected to be used in other countries. Since the lip can be removed without damaging it, analysis will be easier, and research and development to improve the performance of oil seals, such as improved durability, will be promoted.

Many oil seals are used in automobiles and industrial machines, and oil seals are replaced by disassembling work in narrow and deep places. Using this invention, oil seals can be replaced without disassembling work. If so, it can be expected to bring significant time and cost savings. It is possible to easily replace the oil seal, and it is possible to prevent environmental contamination by performing periodic replacement instead of replacing the oil seal after leaking.

DESCRIPTION OF SYMBOLS 1 Main body 2 Removal handle 3 Protective pipe 4 Oil seal 5 Cylindrical tip part 6 Main body handle 7 Spiral tip part 8 Rubber layer 9 Iron core 10 Inner pipe 11 Outer tube 12 Male screw 13 for removal Protective pipe body insertion part 14 Oil seal outer surface 15 Protection pipe oil seal driving part 16 Double lip oil seal 17 Single lip oil seal 18 Peeled double lip oil seal 19 Cylindrical shape for double lip oil seal 20 Single lip oil seal Cylindrical shape for cylinder 21 Cylindrical shape for peeled double lip oil seal 22 Replacement oil seal 23 Fixing block 24 Fixing screw 25 Adhesive 26 Thrust bearing (disc needle needle roller bearing)
27 Bearing plate 28 Dust seal 29 Fall prevention clip 30 Fall prevention clip groove 31 Peripheral cutter 32 Cutter replacement blade (double-edged)
33 Cutter fixing screw 34 Cutter tip 35 Cutter handle 36 Oil seal outer peripheral side surface 37 Outer tube protection collar 38 Joint surface

Claims (6)

A cylindrical shape that matches the shape of the upper side surface in the axial direction of the oil seal, has a screw that fits into the tip screw portion of the main body, a cylindrical tip portion that has a main body, a removable cylindrical tip portion, and a helical screw. Consists of a cylindrical main body having a tip screw portion, a main body handle, and a removal screw, a removal handle fitted to the removal screw, and a protective pipe fitted to the inside of the main body, and the removal handle is attached to the removal screw of the main body. In an oil seal changer in which a protective pipe is inserted from the axially lower side of the screw body to the upper part of the main body and the protective pipe is inserted into the main body from the axially upper side of the opposite body. After attaching the tip and rotating the main body handle to fix the bonded oil seal and the cylindrical tip to the front screw thread, remove the handle It is rotated and moved to the lower part of the removal screw of the main body, pressed against the upper end surface in the outer tube axial direction, and further rotated to remove the oil seal and the main body from the upper side in the outer tube axial direction to remove the oil seal. Oil seal changer Remove the rubber on the upper surface in the axial direction from the oil seal from which the rubber has been peeled off, and have a screw that fits into the tip screw portion of the main body in a cylindrical shape that matches the shape of the upper surface in the axial direction that exposes the internal metal. A removable cylindrical tip, a cylindrical tip screw having a helical screw, a main body handle and a cylindrical main body having a removal screw, a removal handle fitted to the removal screw, and an inside of the main body It is composed of a protective pipe to be fitted, and the removal handle is inserted into the removal screw of the main body from the lower side in the axial direction with the tip screw part to the upper part of the main body. In the inserted oil seal changer, the inner metal on the upper side in the axial direction of the oil seal and the cylindrical tip were bonded, and the main body handle was rotated to bond After fixing the seal and the cylindrical tip to the tip screw part of the main body, rotate the removal handle to move it to the lower part of the main body removal screw, press it against the upper end surface in the outer tube axial direction, and further rotate it to turn the outer tube An oil seal changer for removing an oil seal by pulling out the oil seal and the main body from the upper side in the axial direction 3. The oil seal changer according to claim 1 or 2, wherein an adhesive is applied by removing the cylindrical tip from the main body in order to bond the upper side of the oil seal axial direction and the cylindrical tip by applying pressure. The oil seal is attached to the upper surface in the axial direction through the shaft, and a removal handle fitted to the removal screw is screwed into the main body. Insert the main body insertion part of the protective pipe with the oil seal driving part in the upper part of the direction into the oil seal exchange device main body from the upper side in the axial direction, reverse the main body, the removal handle and the protective pipe, and move the oil seal driving part to the lower side in the axial direction. After passing through the shaft, a fixing part that can be fixed to the shaft by tightening the screw with a cylindrical notch is passed through the shaft and fixed at the top of the main unit. 3. The handle according to claim 1 or 2, wherein the handle is loosened to apply pressure to the oil seal driving portion of the protective pipe, and the upper surface of the oil seal axial direction and the cylindrical tip portion are applied with pressure. Oil seal changer The oil seal changer according to any one of claims 1 to 3, wherein a blade is placed at a position having the same diameter as the outer diameter in the direction parallel to the axis of the oil seal on the cylindrical axial lower side surface that can be passed through the shaft. Attach the outer peripheral side cutter with the handle part on the upper side in the axial direction, rotate the handle part through the shaft, bring the blade into contact with the outer diameter in the direction parallel to the axis of the oil seal, and cut the rubber on the outer peripheral side. 4. The oil seal changer according to claim 1, wherein the seal is easily removed. 5. The oil seal replacement device according to claim 1, wherein a thrust bearing is installed between the removal handle and the upper end surface in the outer tube axial direction. 6. Oil seal changer according to item The oil seal changer according to any one of claims 1 to 5, wherein after the oil seal is removed, the replacement oil seal is passed through the shaft, and can be inserted into the lower part in the axial direction from the upper side in the axial direction of the main body. After inserting the main body insertion part of the protective pipe with the oil seal driving part at the upper part in the axial direction into the main part of the oil seal exchange device from the upper side in the axial direction, the main body and the protective pipe are reversed and the oil sealing driving part is 6. The device according to claim 1, wherein the oil seal driving portion is driven through the shaft toward the lower side in the direction, and the oil seal driving portion is driven against the replacement oil seal by holding the handle of the main body, so that the replacement oil seal can be driven. Oil seal changer according to item