JP2005088144A - Seal member press-in device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal member press-in device, facilitating fitting of a seal. <P>SOLUTION: This device presses an oil seal 6 in a peripheral groove 5 of a crankcase 3 in the periphery of a crankshaft 2. The seal member press-in device 1 includes: a guide cylinder 7 fitted to a neck part 21 of the crankshaft 2; an extruding sleeve 8 fitted to the outer periphery thereof, an air cylinder 10 elevating the sleeve, a rotating rod 11 positioned in the axial parts thereof, and an impact driver for driving the rod to rotate. When the oil seal 6 is fitted to the outer periphery of the lower end of the guide cylinder 7, the whole is placed on the same axis above the crankshaft 2, and a coupling nut 12 at the lower end of the rotating rod 11 is engaged with the shaft end 22 of the crankshaft 2 by a screw to normally rotate the impact driver 17, the engagement of the coupling nut 12 with the shaft end 22 is made deep, so that the extruding sleeve 8 is lowered while compressing the return spring 33 to thereby extrude the oil seal 6 while preventing the seal lip from being turned up, and further complete press-in to the peripheral groove 5 by the force of the air cylinder 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for press-fitting a seal member such as an oil seal into a predetermined position of a workpiece such as a peripheral portion of a rotary shaft.

When installing the oil seal, when manually, the oil seal was struck with a hammer and pressed into the fitting part. Also known is an apparatus that uses a telescopic cylinder device such as an air cylinder and press-fits an oil seal floatingly supported at one end thereof into a work (see Patent Document 1).
JP-A-4-74590

By the way, if the press-fitting device as described above is used, it is possible to eliminate the manual process and improve the efficiency and improve the quality. However, it is necessary to align the axis of the press-fitting device with the center of the fitting portion of the workpiece. Have difficulty. Further, in order to allow the mismatch of the axis lines, a complicated floating support structure as described in Patent Document 1 is required.
Furthermore, when the oil seal is press-fitted, the seal lip that is in sliding contact with the rotating shaft may turn over. However, if the seal lip is turned over, the sealing performance is deteriorated, so it is desired to prevent the seal lip from turning up.
SUMMARY OF THE INVENTION An object of the present invention is to provide a seal press-fitting device that can be easily positioned and can prevent a seal lip from being turned over.

  In order to solve the above problems, the invention of claim 1 relating to the seal member press-fitting device of the present application is to press-fit a seal member into a circumferential groove provided on the case side in order to seal between the rotating shaft and the case housing the same. In the seal press-fitting device for bringing the seal lip into sliding contact with the rotary shaft, the seal lip is fitted to the outer peripheral side of the shaft end of the rotary shaft, and the outer peripheral surface is a sliding surface of the rotary shaft by the seal lip. A guide cylinder that is substantially flush with the guide cylinder, and an extrusion member that is provided on the outer peripheral side of the guide cylinder and pushes the seal member in the axial direction of the guide cylinder, and the seal member is fitted to the outer periphery of the guide cylinder In this state, it is fitted to the outer peripheral side of the shaft end portion of the rotating shaft, and the seal member is pushed out by the pushing member and fitted into the circumferential groove of the case.

  According to a second aspect of the present invention, in the first aspect of the invention, a shaft end coupling member that extends in the axial direction of the guide cylinder and has a tip that can be coupled to and separated from the shaft end of the rotating shaft is provided. The axis line is made to coincide with the axis line of the rotating shaft.

  According to a third aspect of the present invention, in the second aspect of the invention, the shaft end coupling member rotates in the forward direction in a state where the shaft end coupling member is coupled to the shaft end portion of the rotation shaft, thereby rotating the rotation shaft in a direction opposite to the pushing direction of the pushing member. The guide tube and the pushing member are moved relative to each other.

  According to a fourth aspect of the present invention, in the third aspect, the shaft end coupling member and the shaft end are coupled by a screw, and the shaft end coupling member is forwardly rotated to perform coupling and pulling with the shaft end to be reversed. It is characterized by separating from the shaft end.

  A fifth aspect of the present invention is characterized in that, in the second aspect, the push-out member is driven by a cylinder, and the shaft end connecting member passes through an axial center portion of the cylinder device.

  According to the first aspect, since the guide tube is fitted to the shaft end of the rotating shaft, the axis of the rotating shaft and the guide tube can be matched, and the guide tube can be easily positioned. In addition, when the guide tube is fitted to the shaft end of the rotating shaft, the outer peripheral surface of the guide tube is substantially flush with the sliding surface of the rotating shaft. Is pushed out by the pushing member, the sealing member easily moves onto the sliding surface of the rotating shaft and is press-fitted into the circumferential groove on the case side, and at this time, the sealing lip is not turned up.

  According to the second aspect, the positioning is further facilitated by connecting the shaft end portion of the rotating shaft with the shaft end connecting member disposed on the same axis as the rotating shaft.

  According to the third aspect, the guide tube and the pushing member can be moved relative to each other by pulling the rotating shaft opposite to the pushing direction of the pushing member by the shaft end connecting member. The seal member can be press-fitted.

  According to the fourth aspect, since the shaft end coupling member and the shaft end of the rotary shaft are coupled with the screw, the coupling and pulling can be performed if the shaft end coupling member is rotated forward in the fastening direction, and if the rotation is reversed, the pulling is performed. Can be loosened or separated.

  According to the fifth aspect, since the shaft end connecting member is passed through the shaft center portion of the cylinder device provided to move the pushing member, the entire sealing member press-fitting device can be made compact.

Embodiments will be described below with reference to the drawings.
1 is a diagram showing an initial stage state before press-fitting of an oil seal, FIG. 2 is an enlarged cross-sectional view of the oil seal, FIG. 3 is a diagram showing a state during press-fitting of the oil seal (at the time of positioning), and FIG. FIG. 5 is a diagram showing a state immediately after completion of the press-fitting, and FIG. 6 is a diagram showing a press-fitting end state. In the following description, the vertical direction of each part is based on the state shown in FIG.

  FIG. 1 shows an initial stage of the oil seal press-fitting process and before the press-fitting device is set. In FIG. 1, this seal member press-fitting device 1 presses an oil seal 6 into a circumferential groove 5 formed around a shaft hole 4 with respect to a wall surface of a crankcase 3 from which a crankshaft 2 of an engine projects. It is a device for. This device includes a guide cylinder 7 and an extrusion cylinder 8 that is fitted to the outer periphery of the guide cylinder 7, an air cylinder 10 that pushes a top plate 9 in which the extrusion cylinder 8 is integrated, and a shaft center of the air cylinder 10 that passes through. And a rotating rod 11 that performs.

  A coupling nut 12 is integrated with the lower end of the rotating rod 11, and a female screw 13 is formed on the inner peripheral surface thereof. The rotating rod 11 passes through a through hole 14 a formed in the axial center portion of the cylinder rod 14, and is further integrated with the coupling nut 12 through a hole 15 formed in the top plate 9.

  The upper end of the cylinder rod 14 is continuous with the piston 16 that slides in the axial direction inside the air cylinder 10. The piston 16 slides due to the air pressure introduced into the air cylinder 10. Further, the upper end portion of the rotating rod 11 extending upward through the cylinder rod 14 passes through the air cylinder 10 upward and is rotationally driven by the impact driver 17 so as to be rotatable forward and backward. The impact driver 17 is also a tool that operates by air pressure. A stopper 18 is fixed to the upper portion of the rotating shaft 11 by an appropriate method such as welding. The length between the stopper 18 and the lower end of the rotating shaft 11 is constant.

  By holding the impact driver 17 by hand, the air cylinder 10 can be handled integrally. Accordingly, after the seal member 6 is mounted on the outer peripheral surface of the lower end of the guide cylinder 7, the movement such as moving the axis C of the crankshaft 2 with the impact driver 17 and then separating from the crankshaft 2 is freely performed. Be able to. The crankcase 3 is fixed to a work table (not shown).

  When handling the impact driver 17, the air cylinder 10 is free to move in the axial direction relative to the rotating shaft 11, that is, in the vertical direction in the figure, and the lower end of the guide cylinder 7 is free without contacting the workpiece. The air cylinder 10 descends on the rotating shaft 11 and the top plate 9 comes into contact with the coupling nut 12 and stops. If the lower end of the guide cylinder 7 comes into contact with the workpiece and the lower end of the push cylinder 8 is fixed, the air cylinder 10 stops moving at an appropriate position on the rotary shaft 11.

  Further, when the impact driver 17 is moved onto the axis C of the crankshaft 2 during the press-fitting operation of the seal member, the guide cylinder 7, the pushing cylinder 8, the air cylinder 10 and the rotating rod 11 are arranged concentrically. The center axis of each other coincides with the axis C of the crankshaft 2.

  The crankshaft 2 corresponds to the rotation axis of the workpiece in the present invention. Similarly, the crankcase 3 corresponds to a case, the oil seal 6 corresponds to a sealing member, the pushing cylinder 8 corresponds to a pushing member, and the air cylinder 10 corresponds to a cylinder device. The rotating rod 11 and the coupling nut 12 correspond to the shaft end connecting member of the present invention.

  The crankshaft 2 includes a large diameter portion 20 of the oil seal 6, a neck portion 21 having a smaller diameter, and a shaft end 22 having a smaller diameter. A male screw 23 is formed on the outer periphery of the shaft end 22. . The shaft end 22 is sized to fit inside the coupling nut 12. At this time, the male screw 23 engages with the female screw 13 of the coupling nut 12. The outer circumferential surface of the large diameter portion 20 facing the circumferential groove 5 forms a sliding surface 24 of the oil seal 6. A step portion 25 is formed between the sliding surface 24 and the neck portion 21.

  The guide cylinder 7 is a cylindrical member that fits to the outer periphery of the neck portion 21, and when the apparatus 1 is set on the crankcase 3, the tip (lower end in the illustrated state) 30 abuts on the stepped portion 25, The outer peripheral surface 31 is substantially flush with the sliding surface 24 (see FIG. 3). The outer peripheral surface 31 is also a surface for temporary fixing on which the oil seal 6 is slidably fitted.

  The upper end of the guide cylinder 7 shown in the figure forms an outer flange 32, and a return spring 33 made of a spring such as a coil spring is provided between the outer flange 32 and the top plate 9 so as to push the guide cylinder 7 downward. It is fast.

  The extrusion tube 8 is a cylindrical member that is slidably fitted to the outer periphery of the guide tube 7 and is relatively movable in the axial direction, and its upper end is fitted to the inner periphery of the lower end of the large-diameter joint pipe 34. And integrated by welding or the like. The upper end of the joint pipe 34 is integrated with the outer periphery of the top plate 9 by welding or the like. The coupling nut 12 is located in the inner space of the joint pipe 34. Further, the outer flange 32 is in contact with the upper end portion of the push-out cylinder 8 to prevent it from coming off.

  The lower end of the cylinder rod 14 in the air cylinder 10 is in contact with and integrated with the upper surface of the top plate 9, and the push cylinder 8 can be moved (lifted / lowered) in the axial direction by the air cylinder 10. In place of the air cylinder 10, an oil cylinder may be used, and further, a telescopic device using a motor or a link mechanism may be used.

  When the cylinder rod 14 is extended, the push-out cylinder 8 is lowered integrally with the joint pipe 34 and the top plate 9 in the axial direction. At this time, the lower end 35 of the pushing cylinder 8 pushes the oil seal 6 fitted to the outer peripheral surface 31 of the guide cylinder 7 downward along the axial direction.

  In FIG. 1, the seal member press-fitting device 1 is moved above the crankshaft 2, and the axis of the seal member press-fitting device 1 is aligned with the axis C of the crankshaft 2. The initial stage before moving up and setting is shown. In this state, the return spring 33 is not compressed, and the lower end portion of the guide tube 7 protrudes downward from the lower end 35 of the push tube 8 by a length that is about the width of the oil seal 6. This is hereinafter referred to as a reference position.

  As shown in FIG. 2, the oil seal 6 is a ring-shaped member that is press-fitted into the circumferential groove 5, and the metal frame 40 that is fitted along the inner circumferential surface of the circumferential groove 5 and the periphery thereof The rubber part 41 is formed integrally with the rubber part 41, and a seal lip is integrally formed on the inner peripheral part of the rubber part 41, that is, the part in sliding contact with the sliding surface 24.

  The seal lip in this example includes a first seal lip 42 that protrudes obliquely in the press-fitting direction (arrow A) and a second seal lip 43 that protrudes obliquely in the reverse direction (arrow B). Various seal lip structures are possible, and the seal lip structure may protrude only in one direction. Reference numeral 44 denotes a pressing spring for pressing the seal lip toward the sliding surface 24.

  Next, the operation will be described. First, as shown in FIG. 1, the seal member press-fitting device 1 is moved above the crankshaft 2 so that the axes of the seal member press-fitting device 1 and the crankshaft 2 coincide with each other as a reference position, and the outer periphery of the lower end of the guide cylinder 7 The oil seal 6 is fitted and temporarily fixed, and the upper end thereof is brought into contact with the lower end 35 of the pushing cylinder 8.

  In this state, when the seal member press-fitting device 1 is moved and set on the crankcase 3, the lower side of the guide cylinder 7 is fitted to the outer periphery of the neck portion 21 of the crankshaft 2, and the tip 30 comes into contact with the step portion 25. . At this time, the guide tube 7 is centered by the neck portion 21 of the crankshaft 2, and at the same time, the upper end portion of the shaft end 22 enters the inside of the coupling nut 12. Therefore, when the rotating rod 11 is rotated forward by the impact driver 17, the male screw 23 of the shaft end 22 is engaged with the female screw 13 of the coupling nut 12.

  As shown in FIG. 3, when the rotation of the rotating rod 11 is continued, the shaft end 22 becomes deeper into the coupling nut 12 due to the screw coupling between the female screw 13 of the coupling nut 12 and the male screw 23 of the shaft end 22. Therefore, the rotating rod 11 pulls the shaft end 22 of the crankshaft 2 upward. However, since the crankshaft 2 is fixed to the work table or the like together with the crankcase 3, the seal member press-fitting device 1 is pulled downward.

  As a result, the female screw 13 of the coupling nut 12 and the male screw 23 of the shaft end 22 are deeply screw-coupled, and the sealing member press-fitting device 1 is accurately centered on the axis C of the crankshaft 2 and positioned and fixed. Become. At this time, if the coupling nut 12 and the shaft end 22 are sufficiently coupled, the stopper 18 comes into contact with the upper end surface of the air cylinder 10 (see FIG. 4), and the upward movement of the entire air cylinder 10 is restricted. Although the length of the rotating shaft 11 between the stopper 18 and the coupling nut 12 is constant, an error or the like at the time of fastening is absorbed by the return spring 33 being compressed between the outer flange 32 and the top portion 9.

  Therefore, when the rotation of the rotary rod 11 is stopped and the air cylinder 10 is extended as shown in FIG. 4, the top plate 9 compresses the return spring 33 because the entire air cylinder 10 is restricted by the stopper 18. Then, the push-out cylinder 8 is moved downward via 34. At this time, since the tip 30 of the guide cylinder 7 is in contact with the step portion 25 of the crankshaft 2, the pushing cylinder 8 is lowered while leaving the guide cylinder 7 stationary, as shown in FIG. The lower end 35 pushes down the oil seal 6 fitted to the outer peripheral surface 31 of the guide cylinder 7 and press-fits completely into the circumferential groove 5 from the guide cylinder 7.

  At this time, since the outer peripheral surface 31 of the guide cylinder 7 and the sliding surface 24 of the crankshaft 2 are substantially flush, the first seal lip 42 and the second seal lip 43 of the oil seal 6 are It slides without turning over the sliding surface 24 and is press-fitted into the circumferential groove 5.

  In particular, as shown in FIG. 2, the first seal lip 42 of the oil seal 6 protrudes in the direction indicated by the arrow A, which is the press-fitting direction. In the case of fitting to the outer periphery, the seal lip is easily turned over, but such turn-up can be effectively prevented.

  After press-fitting the oil seal 6, as shown in FIG. 6, when the air cylinder 10 is contracted and the impact driver 17 is reversed to uncouple the coupling nut 12 and the shaft end 22, The plate 9 is raised, and the pushing cylinder 8 is also moved upward together with this, leaving the oil seal 6 in the circumferential groove 5 in a press-fitted state. Further, when the entire seal member press-fitting device 1 is moved upward and returned to the reference position shown in FIG. 1, the entire press-fitting process is completed.

  Thus, according to this embodiment, since the guide cylinder 7 is fitted to the outer peripheral side of the shaft end portion of the crankshaft 2, the axes of the crankshaft 2 and the guide cylinder 7 can be made to coincide with each other. Positioning is facilitated, and the centering of the oil seal 6 that is temporarily fixed to the outer periphery of the guide cylinder 7 becomes accurate, and positioning work is facilitated.

  Further, when the guide cylinder 7 is fitted to the outer periphery of the neck portion 21 of the crankshaft 2, the outer peripheral surface of the guide cylinder 7 is substantially flush with the sliding surface 24 of the crankshaft 2. If the oil seal 6 fitted upward is pushed out by the push-out cylinder 8, the oil seal 6 easily moves onto the sliding surface 24 while preventing the seal lip from turning up and into the circumferential groove 5 of the crankcase 3. Since it is press-fitted, work efficiency is good and the quality related to the seal can be stabilized, so that work efficiency and quality can be improved.

  In addition, the rotating rod 11 and the coupling nut 12 arranged on the same axis as the crankshaft 2 are connected to the shaft end 22 of the crankshaft 2 to facilitate positioning. In addition, since the coupling nut 12 and the shaft end 22 of the crankshaft 2 are screw-coupled by the female screw 13 and the male screw 23, if the rotating rod 11 is rotated forward in the fastening direction, the coupling and pulling can be performed. The tension can be relaxed or separated.

  Furthermore, by pulling the crankshaft 2 in the direction (B in FIG. 2) opposite to the pushing direction of the pushing cylinder 8 (A in FIG. 2), the guide cylinder 7 and the pushing cylinder 8 can be moved relative to each other. Thus, the oil seal 6 can be press-fitted by the pushing cylinder 8.

  Further, since the rotating rod 11 is passed through the axial center portion of the air cylinder 10, the entire seal member press-fitting device 1 can be made compact.

The present invention is not limited to the illustrated example, and can be used for various types of oil seal press-fitting. Moreover, not only the oil seal but also a seal such as a dust seal may be used as long as it has a seal lip.
Furthermore, the relationship between the rotating shaft and the case is not limited to the engine, and may be in various devices.
The extruded cylinder 8 is not necessarily a cylindrical member, and may be an extruded member having a ring shape or a non-cylindrical shape such as a claw or an arm shape.

The figure which shows the state before the press injection of the oil seal Enlarged cross section of oil seal Diagram showing the state of oil seal press-fitting (during positioning) Same as above (press-fit) The figure which shows the state immediately after completing the same press-fitting Diagram showing the end of press-fitting

Explanation of symbols

1: seal member press-fitting device, 2: crankshaft, 3: crankcase, 4: shaft hole, 5: circumferential groove, 6: oil seal, 7: guide tube, 8: push-out tube, 9: top, 10: air cylinder 11: rotating rod, 12: coupling nut, 13: female thread, 14: cylinder rod, 17: impact driver, 18: stopper, 20: large diameter part, 21: neck, 22: shaft end, 23: male thread, 24: sliding surface, 25: stepped portion, 33: first seal lip, 34: second seal lip

Claims (5)

In a seal press-fitting device that seals between a rotary shaft and a case that accommodates the rotary shaft so as to press-fit a seal member into a circumferential groove provided on the case side so that the seal lip slides on the rotary shaft.
A guide tube that fits on the outer peripheral side of the shaft end of the rotating shaft and whose outer peripheral surface is substantially flush with the sliding surface of the rotating shaft by the seal lip;
An extrusion member that is provided on the outer peripheral side of the guide tube and pushes the seal member in the axial direction of the guide tube;
The seal member is fitted to the outer periphery of the guide tube and fitted to the outer peripheral side of the shaft end of the rotary shaft, and the seal member is pushed out by the push member and fitted into the circumferential groove of the case. A seal member press-fitting device. A shaft end connecting member that extends in the axial direction of the guide tube and has a tip that can be coupled / separated to the shaft end of the rotating shaft, and the axis of the shaft end connecting member is aligned with the axis of the rotating shaft; The seal member press-fitting device according to claim 1. The shaft end connecting member rotates in a forward direction in a state of being coupled to the shaft end portion of the rotating shaft, thereby pulling the rotating shaft in a direction opposite to the pushing direction of the pushing member, and relatively moving the guide tube and the pushing member. The sealing member press-fitting device according to claim 2, wherein: The shaft end connecting member and the shaft end are coupled with a screw, and the shaft end connecting member is coupled and pulled with the shaft end by rotating forward, and separated from the shaft end by reversing. Item 3. The seal member press-fitting device according to Item 3. 3. The seal member press-fitting device according to claim 2, wherein the push-out member is driven by a cylinder, and the shaft end connecting member passes through an axial center portion of the cylinder device.

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