JP6089762B2 - O-ring mounting jig - Google Patents

Description

  The present invention relates to an O-ring mounting jig.

  As this type of technology, Patent Document 1 discloses that when the O-ring is pushed into the inner peripheral surface of the hole of the workpiece and is elastically fitted, the O-ring is not twisted and does not jump out of the hole. Two arc portions that are diametrically symmetrical are pressed, and then the remaining arc portions of the O-ring are pressed.

JP-A-9-323226

  The technology that further reduces the twist remaining in the O-ring attached to the workpiece is expected.

  An object of the present invention is to provide a technique for reducing twist remaining in an O-ring attached to a workpiece.

According to a first aspect of the present invention, there is provided an O-ring mounting jig for press-fitting an O-ring into an inner periphery of an O-ring mounting object, and press-fitting the O-ring into the O-ring mounting object. An O-ring mounting jig is provided that has a press-fitting surface that faces the O-ring in a press-fitting direction as a direction to be pushed, and the press-fitting surface has an inclined surface that inclines toward the press-fitting direction toward the outer peripheral side. Is done. According to the above configuration, a technique for reducing the twist remaining in the O-ring attached to the O-ring attachment object is realized.
According to a second aspect of the present invention, there is provided an O-ring mounting jig for press-fitting an O-ring into an inner periphery of an O-ring mounting object, and press-fitting the O-ring into the O-ring mounting object. There is provided an O-ring mounting jig having a press-fitting surface facing the O-ring in a press-fitting direction as a direction to be pushed, and the press-fitting surface is inclined so as to go to the press-fitting direction as going to the outer peripheral side. . According to the above configuration, a technique for reducing the twist remaining in the O-ring attached to the O-ring attachment object is realized.
An outer peripheral surface contacting the inner peripheral end of the O-ring;
The inclination angle of the press-fitting surface is 10 to 45 [deg.] With respect to a plane orthogonal to the press-fitting direction.
The inclination angle of the inclined surface is 15 to 30 [deg.] Based on a surface orthogonal to the press-fitting direction.

  According to the present invention, a technique for reducing twist remaining in the O-ring attached to the O-ring attachment object is realized.

FIG. 1 is a diagram showing a state in which a workpiece and an O-ring mounting jig face each other in the press-fitting direction. (First embodiment) FIG. 2 is a diagram illustrating a state in which the workpiece comes into contact with the O-ring held by the O-ring mounting jig as a result of lowering the workpiece. (First embodiment) FIG. 3 is a view showing a state in which the O-ring held by the O-ring mounting jig is deformed as a result of further lowering the workpiece. (First embodiment) FIG. 4 is a view showing a state where the O-ring held by the O-ring mounting jig is fitted to the inner periphery of the work as a result of further lowering the work. (First embodiment) FIG. 5 is a view showing a state in which an O-ring is attached to the workpiece. (First embodiment) FIG. 6 is an enlarged view of a portion A in FIG. 2, and an O-ring is not drawn for convenience of explanation. (First embodiment) FIG. 7 is an enlarged view of part A in FIG. (First embodiment) FIG. 8 is an explanatory diagram of forces acting on the O-ring. (First embodiment) FIG. 9 is a diagram showing FIG. 8 in an insulator model. (First embodiment) FIG. 10 is a comparative example and is an explanatory diagram of forces acting on the O-ring. FIG. 11 is a comparative example, and is a diagram in which FIG. 10 is represented by an insulator model. FIG. 12 corresponds to FIG. (Second Embodiment) FIG. 13 corresponds to FIG. (Second Embodiment)

(First embodiment)
The first embodiment of the present invention will be described below with reference to FIGS.

  1 to 5 sequentially show a series of states in which the O-ring 1 is press-fitted and attached to the inner periphery of the work 2 (O-ring attachment object). As shown in FIG. 1, the direction in which the O-ring 1 is press-fitted into the inner periphery of the work 2 is defined as the press-fitting direction.

  As shown in FIG. 1, the O-ring mounting device 3 is for press-fitting and mounting an O-ring 1 on the inner periphery of a work 2. The O-ring attachment device 3 includes an O-ring attachment jig 4 that holds the O-ring 1 and a workpiece holder 5 (an O-ring attachment object holder) that holds the workpiece 2.

(Work 2)
The work 2 has an outer cylinder part 6, an inner cylinder part 7, and a connecting part 8.

  The outer cylinder portion 6 has an outer peripheral surface 9.

  The inner cylinder part 7 is arranged on the inner peripheral side of the outer cylinder part 6. As shown in FIGS. 1 and 6, the inner cylindrical portion 7 includes a first inner peripheral surface 10, a second inner peripheral surface 11 (O-ring mounting surface, O-ring mounting inner peripheral surface), and a third inner peripheral surface. 12, a first orthogonal surface 13, and a second orthogonal surface 14. The first inner peripheral surface 10, the second inner peripheral surface 11, and the third inner peripheral surface 12 are arranged in this order in the press-fitting direction. The inner diameter of the first inner peripheral surface 10 is larger than the inner diameter of the second inner peripheral surface 11. The inner diameter of the second inner peripheral surface 11 is larger than the inner diameter of the third inner peripheral surface 12. The first orthogonal surface 13 is a surface orthogonal to the press-fitting direction. The first orthogonal surface 13 is located between the first inner peripheral surface 10 and the second inner peripheral surface 11. As shown in FIG. 6, a guide inclined surface 15 is formed between the second inner peripheral surface 11 and the first orthogonal surface 13. The guide inclined surface 15 is a surface inclined approximately 45 degrees with respect to the press-fitting direction. For convenience of explanation, an intersecting line where the first orthogonal surface 13 and the guide inclined surface 15 intersect is illustrated as an intersecting line 16. The second orthogonal surface 14 is a surface orthogonal to the press-fitting direction. The second orthogonal surface 14 is located between the second inner peripheral surface 11 and the third inner peripheral surface 12.

  The connecting portion 8 is a portion that connects the outer cylindrical portion 6 and the inner cylindrical portion 7.

(Work holder 5)
The workpiece holder 5 holds the workpiece 2 as described above. The work holder 5 is configured to hold the outer cylindrical portion 6 of the work 2 and to be lifted and lowered by an actuator (not shown).

(O-ring mounting jig 4)
The O-ring attachment jig 4 holds the O-ring 1 as described above. As shown in FIG. 1, the O-ring mounting jig 4 is used by being fixed on a work table 17. The O-ring mounting jig 4 includes a jig body 18 and an oil sealing 19.

  The jig main body 18 includes an outer cylinder portion 20, a punch base portion 21, a punch main body 22, and a connecting portion 23. The outer cylinder portion 20 has an inner peripheral surface 24. The punch base 21 and the punch main body 22 are disposed on the inner peripheral side of the outer cylindrical portion 20. The punch base 21 and the punch body 22 are both formed in a cylindrical shape. The outer diameter of the punch base 21 is larger than the outer diameter of the punch body 22. The punch base 21 and the punch body 22 are arranged in this order in the press-fitting direction. As shown in FIG. 6, the punch base 21 has an outer peripheral surface 25, a flat seat surface 26 (press-fit surface), and an inclined surface 27. As shown in FIG. 7, the flat seat surface 26 is a surface facing the O-ring 1 in the press-fitting direction. As shown in FIG. 6, the flat seat surface 26 has an inclined surface that inclines toward the press-fit direction toward the outer peripheral side. The flat seat surface 26 of the present embodiment is generally inclined so as to go in the press-fitting direction toward the outer peripheral side. That is, in this embodiment, the flat seat surface 26 is an inclined surface. The inclination angle θ of the flat seat surface 26 is 10 to 45 [deg.] With reference to the reference surface 28 as a surface orthogonal to the press-fitting direction. The inclination angle θ of the flat seat surface 26 is preferably 15 to 30 [deg.]. In the present embodiment, the inclination angle θ of the flat seat surface 26 is 15 [deg.]. The inclined surface 27 is disposed between the outer peripheral surface 25 and the flat seat surface 26.

  The oil sealing 19 is a ring-shaped sealing that fits on the outer periphery of the punch body 22. As shown in FIG. 6, the oil sealing 19 has an outer peripheral surface 29. As shown in FIG. 7, the outer peripheral surface 29 of the oil sealing 19 is in contact with the inner peripheral end 30 of the O-ring 1. In this embodiment, the oil sealing 19 is prepared as a separate component from the punch body 22 and the oil sealing 19 is fitted on the outer periphery of the punch body 22. May be configured integrally.

(Operation)
Next, the operation of the O-ring mounting device 3 will be described.

  First, as shown in FIG. 1, an oil sealing 19 is attached to the jig body 18. Specifically, the oil sealing 19 is fitted on the outer periphery of the punch body 22 of the jig body 18.

  Next, as shown in FIGS. 1 and 7, the O-ring 1 is set on the O-ring mounting jig 4. Specifically, the O-ring 1 is fitted on the outer periphery of the oil seal 19, and the O-ring 1 is seated on the flat seat surface 26 as shown in FIG. As a result, the inner peripheral end 30 of the O-ring 1 comes into contact with the outer peripheral surface 29 of the oil sealing 19. Further, since the flat seat surface 26 is inclined so as to rise in the press-fitting direction toward the outer periphery, the first contact line L1 as a contact line between the O ring 1 and the flat seat surface 26 is the center of the cross section of the O ring 1 It is located on the outer peripheral side.

  Next, as shown in FIG. 2, the workpiece holder 5 is lowered. Then, the outer peripheral surface 9 of the outer cylindrical portion 6 of the workpiece 2 and the inner peripheral surface 24 of the outer cylindrical portion 20 of the jig main body 18 of the O-ring mounting jig 4 come into contact with each other. The central axes coincide. In addition, as shown in FIG. 7, the intersecting line 16 of the work 2 contacts the O-ring 1. At this time, as shown in FIG. 8, a push-up force F1 is applied to the O-ring 1 from the O-ring mounting jig 4 via the first contact line L1. The push-up force F1 is a force acting in the press-fitting direction. Further, a push-down force F2 acts on the O-ring 1 from the work 2 through the intersection line 16. The pressing force F2 is a force acting in the direction opposite to the press-fitting direction. The O-ring 1 starts to be elastically deformed by the generation of the push-up force F1 and the push-down force F2. Here, the magnitude of the push-down force F2 with respect to the push-up force F1 can be easily obtained by the lever model shown in FIG. That is, in the insulator model of FIG. 9, the inner peripheral end 30 of the O-ring 1 is simply supported, and the O-ring 1 is regarded as a horizontal bar.

  Here, FIG. 10 shows a comparative example in which the flat seat surface 26 is not inclined and the flat seat surface 26 is orthogonal to the press-fitting direction. In the comparative example shown in FIG. 10, the first contact line L1 is located directly below the center of the cross section of the O-ring 1. Also in the comparative example, the magnitude of the push-down force F2 with respect to the push-up force F1 can be easily obtained by the lever model shown in FIG. That is, also in the insulator model of FIG. 11, the inner peripheral end 30 of the O-ring 1 is simply supported, and the O-ring 1 is regarded as a horizontal bar.

  8 and 10, when the O-ring 1 comes into contact with the workpiece 2 and begins to be elastically deformed, the intersection line 16 as a contact line between the O-ring 1 and the workpiece 2 and the O-ring 1 and the plain seat surface are compared. The distance D between the first contact line L1 and the first contact line L1 as a contact line with 26 is smaller in the present embodiment of FIG. This is because the flat seat surface 26 is inclined in FIG. And since this distance D is small, compared with the comparative example, this embodiment has a small push-down force F2 that the O-ring 1 receives from the workpiece 2 when the O-ring 1 starts to come into contact with the workpiece 2 and elastically deforms. Compared with the insulator model of FIG. 9 and the insulator model of FIG. 11, this embodiment also compares the O-ring 1 with the workpiece 2 when the O-ring 1 comes into contact with the workpiece 2 and begins to be elastically deformed. It will be understood that the pressing force F2 received from the motor is small. That is, the lever model of FIG. 9 has a smaller distance in the horizontal direction between the point of action of the push-up force F1 and the point of action of the push-down force F2 than the lever model of FIG. Since the pressing force F2 received by the O-ring 1 from the workpiece 2 is small when the O-ring 1 starts to come into contact with the workpiece 2 and elastically deforms, the amount of deformation of the O-ring 1 caused by press fitting is small. Since the deformation amount of the O-ring 1 due to the press-fitting is small, the twist remaining in the O-ring 1 attached to the workpiece 2 is similarly reduced.

  Returning to FIG. 2, when the work holder 5 is further lowered, the O-ring 1 is press-fitted into the inner periphery of the work 2 with elastic deformation as shown in FIG. 3. FIG. 4 shows a state in which the O-ring 1 is completely press-fitted into the inner periphery of the work 2. When the work holder 5 is raised in the state of FIG. 4, as shown in FIG. 5, the O-ring 1 remains fitted in the inner periphery of the work 2. At this time, since the twist remaining in the O-ring 1 is small, the displacement due to the residual twist stress is suppressed.

  Further, since the pressing force F2 received by the O-ring 1 from the workpiece 2 is small when the O-ring 1 starts to come into contact with the workpiece 2 and elastically deforms, the O-ring 1 is hardly damaged. Further, since the deformation amount of the O-ring 1 due to the press-fitting is small, the O-ring 1 is difficult to be caught between the workpiece 2 and the O-ring mounting jig 4.

  Although the first embodiment of the present invention has been described above, the first embodiment has the following features.

(1, 2) The O-ring mounting jig 4 is used for press-fitting and mounting the O-ring 1 on the inner periphery of the work 2 (O-ring mounting object). The O-ring mounting jig 4 has a flat seat surface 26 (press-fit surface) that faces the O-ring 1 in the press-fitting direction as the direction in which the O-ring 1 is press-fitted into the work 2. The flat seat surface 26 has an inclined surface that inclines toward the press-fitting direction as it goes toward the outer peripheral side. In other words, the flat seat surface 26 is inclined so as to go in the press-fitting direction as it goes to the outer peripheral side. According to the above configuration, the intersection line 16 as the contact line between the O-ring 1 and the workpiece 2, the O-ring 1 and the flat seat surface 26 at the time when the O-ring 1 starts to come into contact with the workpiece 2 and elastically deform. The distance D between the contact line L1 and the first contact line L1 is small. Since this distance D is small, the pressing force F2 received by the O-ring 1 from the work 2 is small when the O-ring 1 starts to come into contact with the work 2 and elastically deform. Since the pressing force F2 received by the O-ring 1 from the workpiece 2 is small when the O-ring 1 starts to come into contact with the workpiece 2 and elastically deforms, the deformation amount of the O-ring 1 due to press-fitting is small. Since the deformation amount of the O-ring 1 due to the press-fitting is small, the twist remaining in the O-ring 1 attached to the workpiece 2 is small.

  In addition, since the flat seat surface 26 is inclined as described above, the O-ring 1 is difficult to protrude from the flat seat surface 26 to the outer peripheral side during press-fitting. Further, since the flat seat surface 26 is inclined as described above, the O-ring 1 tends to move toward the inner peripheral side during press-fitting.

(3) The O-ring mounting jig 4 has an outer peripheral surface 29 that contacts the inner peripheral end of the O-ring 1. According to the above configuration, the O-ring mounting jig 4 can stably hold the O-ring 1.

  In other words, since the flat seat surface 26 is inclined as described above, the O-ring 1 is closer to the inner peripheral side and presses strongly against the outer peripheral surface 29 during press-fitting. It can be mentioned that the twisting of the O-ring 1 is reduced by the strong contact between the O-ring 1 and the outer peripheral surface 29.

(4) In addition, the inclination angle θ of the flat seat surface 26 is 10 to 45 [deg.], Preferably 15 to 30 [deg.] With respect to the reference surface 28 as a surface orthogonal to the press-fitting direction. .], And in the above embodiment, 30 [deg.].

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. Here, the present embodiment will be described with a focus on differences from the first embodiment, and overlapping descriptions will be omitted as appropriate. In addition, in principle, the same reference numerals are assigned to components corresponding to the respective components of the first embodiment.

  As shown in FIG. 12, in this embodiment, the flat seat surface 26 includes an inner peripheral side orthogonal surface 40 and an outer peripheral side inclined surface 41 (inclined surface). The inner peripheral orthogonal surface 40 is a surface orthogonal to the press-fitting direction. The outer peripheral side inclined surface 41 is an inclined surface that inclines so as to go in the press-fitting direction toward the outer peripheral side. The outer peripheral inclined surface 41 is disposed on the outer peripheral side of the inner peripheral orthogonal surface 40. The inclination angle θ of the outer peripheral inclined surface 41 of the flat seat surface 26 is 10 to 45 [deg.] With reference to the reference surface 28 as a surface orthogonal to the press-fitting direction. Preferably, the inclination angle θ of the outer peripheral inclined surface 41 of the flat seat surface 26 is 15 to 30 [deg.]. In the present embodiment, the inclination angle θ of the outer peripheral inclined surface 41 of the flat seat surface 26 is 30 [deg.].

  Thus, as the inclination angle θ is increased, the distance between the intersection line 16 and the first contact line L1 is further reduced as shown in FIG. 13, so that the technical description in the first embodiment is performed. The effect will be more powerful.

1 O-ring 2 Work 4 O-ring mounting jig 26 Flat seat surface

Claims (3)

An O-ring mounting jig for press-fitting and mounting an O-ring on the inner periphery of an O-ring mounting object,
A press-fitting surface facing the O-ring in a press-fitting direction as a direction of press-fitting the O-ring into the O-ring attachment object;
An outer peripheral surface contacting the inner peripheral end of the O-ring in a state where the O-ring is seated on the press-fitting surface;
Have
The press-fitting surface has an inclined surface that inclines so as to go in the press-fitting direction toward the outer peripheral side.
O-ring mounting jig. The O-ring mounting jig according to claim 1,
The inclination angle of the inclined surface of the press-fitting surface is 10 to 45 [deg.] Based on a surface orthogonal to the press-fitting direction. ]
O-ring mounting jig. The O-ring mounting jig according to claim 1 ,
The inclination angle of the inclined surface of the press-fitting surface is 15 to 30 [deg.] With respect to a surface orthogonal to the press-fitting direction. ]
O-ring mounting jig.

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