Fitting device of ring-like elastic member

Abstract

To easily and securely fit a ring-like elastic member to an outer peripheral surface of a workpiece while preventing phase displacement of the ring-like elastic member to the workpiece.SOLUTION: A fitting device 11 is a device for fitting a gasket 1 as a ring-like elastic member to a flange part 7 provided on an outer peripheral surface of a thermostat 6 as a workpiece. The fitting device 11 includes: a mounting section 14 for mounting the thermostat 6; a holding section 15 for holding the gasket 1 in an initial position P where a part of the gasket 1 is temporarily fitted to the flange part 7 of the thermostat 6 mounted on the mounting section 14; and a movable section 20 moving along an inner peripheral surface of the gasket 1 from the initial position P. The movable section 20 includes: an enlarged diameter part 28 for pressing and enlarging a part of the inner peripheral surface of the gasket 1 to an outer diameter side to expand a diameter; and a pressing part 29 for pressing an enlarged diameter portion of the gasket 1 to the thermostat 6 side, and sequentially fitting to the flange part 7.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a mounting device for a ring-shaped elastic member. [Background technology]

[0002] Internal combustion engines installed in automobiles and the like are equipped with a thermostat for controlling the temperature of the cooling water. The thermostat has a disk-shaped flange portion (valve seat) on its outer periphery for fixing the thermostat to the internal combustion engine. The thermostat is installed in the internal combustion engine with a gasket attached to the flange portion (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-50969 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, in many cases, a ring-shaped elastic member such as a gasket is manually attached to a flange portion of a workpiece such as a thermostat by an operator using a rod-shaped member.

[0005] However, manual work using a rod-shaped member is prone to phase misalignment of the ring-shaped elastic member relative to the workpiece (circumferential positional misalignment of the ring-shaped elastic member relative to the flange of the workpiece). If such a phase misalignment occurs between the two, problems such as an inability to correctly assemble the workpiece with the ring-shaped elastic member in the specified position or a deterioration in the sealing performance of the ring-shaped elastic member may occur.

[0006] Furthermore, manual installation using a rod-shaped member requires a lot of time and effort, which increases costs. This problem becomes more pronounced as the shape of the ring-shaped elastic member becomes more complex.

[0007] An object of the present invention is to reliably attach a ring-shaped elastic member to a flange portion of a workpiece in a short time while preventing the ring-shaped elastic member from being out of phase with the workpiece. [Means for solving the problem]

[0008] (1) The present invention, which was invented to solve the above-mentioned problems, is a ring-shaped elastic member mounting device for mounting a ring-shaped elastic member on a flange portion provided on the outer periphery of a workpiece, and is characterized in that it comprises a mounting section for mounting the workpiece, a holding section for holding the ring-shaped elastic member at an initial position where a portion of the ring-shaped elastic member is temporarily mounted on the flange portion of the workpiece placed on the mounting section, and a movable section that moves from the initial position along the inner surface of the ring-shaped elastic member, and the movable section comprises an expanding section that presses and spreads a portion of the inner surface of the ring-shaped elastic member toward the outer diameter to expand the diameter, and a pressing section that presses the expanded portion of the ring-shaped elastic member toward the workpiece to sequentially mount it on the flange portion.

[0009] In this way, the ring-shaped elastic member is held by the holding portion in the initial position, preventing the ring-shaped elastic member from shifting out of phase with respect to the workpiece during attachment. Furthermore, the diameter-expanding portion presses the inner circumferential surface of the ring-shaped elastic member to expand its diameter, and the pressing portion presses the expanded portion of the ring-shaped elastic member toward the workpiece, thereby attaching a portion of the ring-shaped elastic member to the flange portion of the workpiece. Then, by moving the movable portion from the initial position along the inner circumferential surface of the ring-shaped elastic member, the diameter-expanding portion and the pressing portion gradually expand the portion of the ring-shaped elastic member attached to the flange portion of the workpiece in the circumferential direction of the flange portion from the initial position. Therefore, the ring-shaped elastic member can be reliably attached to the flange portion of the workpiece in a short time while preventing the ring-shaped elastic member from shifting out of phase with respect to the workpiece.

[0010] (2) In the above configuration (1), it is preferable that the enlarged diameter portion is capable of rolling along the inner peripheral surface of the ring-shaped elastic member.

[0011] This reduces the frictional resistance between the enlarged diameter portion and the ring-shaped elastic member, making the ring-shaped elastic member less susceptible to damage.

[0012] (3) In the configuration of (1) or (2) above, it is preferable that the portion of the enlarged diameter portion that contacts the inner peripheral surface of the ring-shaped elastic member moves on a circular orbit, and that the diameter of the circular orbit is larger than the inner diameter of the ring-shaped elastic member at the portion that is attached to the flange portion.

[0013] In this way, the inner peripheral surface of the ring-shaped elastic member can be sufficiently expanded toward the outer diameter side by the expanded diameter portion, making it easier to attach the ring-shaped elastic member to the flange portion of the workpiece.

[0014] (4) In the configuration of (3) above, it is preferable that the center of the circular orbit of the enlarged diameter portion is offset from the center of the flange portion in a direction away from the holding portion.

[0015] In this way, the offset of the circular orbit of the expansion portion reduces the force (expansion amount) exerted by the expansion portion to push the ring-shaped elastic member outward around the initial position. In other words, when the area of ​​the portion of the ring-shaped elastic member attached to the flange portion of the workpiece is small and the frictional resistance between the ring-shaped elastic member and the flange portion of the workpiece is low, the deformation amount of the ring-shaped elastic member is reduced, thereby suppressing the occurrence of phase shift of the ring-shaped elastic member relative to the workpiece. On the other hand, the offset of the circular orbit of the expansion portion increases the force (expansion amount) exerted by the expansion portion to push the ring-shaped elastic member outward at positions away from the initial position. In other words, when the area of ​​the portion of the ring-shaped elastic member attached to the flange portion of the workpiece becomes large to a certain extent, the frictional resistance between the ring-shaped elastic member and the flange portion of the workpiece increases, making it less likely that the ring-shaped elastic member will shift out of phase with the workpiece, even if the deformation amount of the ring-shaped elastic member increases. Therefore, adjusting the expansion amount of the ring-shaped elastic member exerted by the expansion portion in this manner can more reliably prevent the ring-shaped elastic member from shifting out of phase with the workpiece. [Effects of the Invention]

[0016] According to the present invention, the ring-shaped elastic member can be reliably attached to the flange portion of the workpiece in a short time while preventing the ring-shaped elastic member from being out of phase with the workpiece. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a gasket as an example of a ring-shaped elastic member. [Figure 2] FIG. 2 is a longitudinal sectional view of the gasket of FIG. 1. [Figure 3] 2 is a longitudinal cross-sectional view of a thermostat as an example of a workpiece, showing a state in which the gasket of FIG. 1 is attached. [Figure 4] 1 is a vertical cross-sectional view showing a mounting device for a ring-shaped elastic member according to an embodiment of the present invention. [Figure 5] 5 is an enlarged vertical cross-sectional view showing the initial position of the thermostat to which the gasket is temporarily attached in the attachment device shown in FIG. 4 and its surroundings. FIG. [Figure 6] 5 is a vertical cross-sectional view illustrating a step of attaching a gasket to a flange portion of a thermostat by using a diameter-enlarging portion and a pressing portion of the attachment device shown in FIG. 4. FIG. [Figure 7] XX cross-sectional view of FIG. 6. [Figure 8] 5 is a plan view showing the positional relationship between the circular orbit of the contact portion of the expanded diameter portion in the installation device shown in FIG. 4 and the inner circumferential surface of the gasket. FIG. [Figure 9] FIG. 10 is a perspective view showing a modified example of the gasket. [Figure 10] FIG. 10 is a longitudinal cross-sectional view of the gasket of FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0019] In this embodiment, the ring-shaped elastic member is a gasket made of rubber or resin, and the workpiece is a thermostat.

[0020] 1 and 2, the gasket 1 includes a first ring-shaped portion 2 having a relatively small inner diameter, and a second ring-shaped portion 3 having a relatively large inner diameter and integrally connected to the lower end of the first ring-shaped portion 2. The inner peripheral surface 3a of the second ring-shaped portion 3 is located on the outer diameter side of the inner peripheral surface 2a of the first ring-shaped portion 2, and the outer peripheral surface 3b of the second ring-shaped portion 3 is located on the outer diameter side of the outer peripheral surface 2b of the first ring-shaped portion 2.

[0021] The first ring-shaped portion 2 is provided with a notch 4 in a part of its circumferential direction. The second ring-shaped portion 3 is provided with an annular groove 5 on its inner circumferential surface 3a.

[0022] The gasket 1 is configured so that when the inner peripheral surface 2a of the first ring-shaped portion 2 is elastically deformed so as to expand in diameter outward, the inner peripheral surface 3a of the second ring-shaped portion 3 also elastically deforms so as to expand in diameter outward in accordance with the deformation of the first ring-shaped portion 2. When the upper surface 2c of the first ring-shaped portion 2 is pressed downward, the second ring-shaped portion 3 is also pressed downward by the first ring-shaped portion 2.

[0023] As shown in Figure 3, when the gasket 1 is attached to the thermostat 6, the groove 5 of the second ring-shaped portion 3 fits around the entire periphery of a disk-shaped flange 7 provided on the outer circumferential surface of the thermostat 6. The flange 7 of the thermostat 6 is provided with a jiggle valve 8 that functions as an air vent for bleeding. The gasket 1 is attached so that the jiggle valve 8 is located in a position corresponding to the notch 4 of the first ring-shaped portion 2. If the jiggle valve 8 does not interfere with the first ring-shaped portion 2, the notch 4 may be omitted.

[0024] 4 and 5, the mounting device 11 according to this embodiment is a device that mounts the gasket 1 to the thermostat 6 in order to manufacture the thermostat 6 with the gasket 1 shown in Fig. 3. The mounting device 11 includes a base 12 and a lid 13 that surrounds the upper space of the base 12 to define a mounting space S.

[0025] The base portion 12 includes a mounting portion 14 on which the thermostat 6 is placed, and a holding portion 15 that holds the gasket 1 at an initial position P where a portion of the gasket 1 in the circumferential direction is temporarily attached to the flange portion 7 of the thermostat 6 placed on the mounting portion 14.

[0026] The lid 13 is attached to the base 12 via a hinge 16 and can be opened and closed. When the lid 13 is closed, the lid 13 can be locked to the base 12 by a locking mechanism 17. The lid 13 has a window 18 that allows the interior to be viewed. With the lid 13 open, the thermostat 6 with the gasket 1 temporarily attached is placed on the mounting portion 14, and with the lid 13 closed, an attachment process is performed in which the gasket 1 is attached to the thermostat 6.

[0027] The mounting portion 14 has an accommodation hole 19 that accommodates a portion of the thermostat 6 below the flange portion 7. With the lower portion of the thermostat 6 accommodated in the accommodation hole 19, the upper portion of the thermostat 6, including the flange portion 7, protrudes above the upper surface 14a of the mounting portion 14. In this state, the flange portion 7 is spaced upward from the upper surface 14a of the mounting portion 14, and spaces are formed above and below the flange portion 7. Although not shown in the figures, with the lower portion of the thermostat 6 accommodated in the accommodation hole 19, part of the upper portion of the thermostat 6 comes into contact with the upper surface 14a of the mounting portion 14. This allows the thermostat 6 to remain stably mounted on the mounting portion 14.

[0028] The retaining portion 15 is a cylindrical member that protrudes upward from the upper surface 14a of the mounting portion 14 at the initial position P. When a portion of the gasket 1 is temporarily attached to the flange portion 7 of the thermostat 6, the gasket 1 is positioned relative to the thermostat 6 so that the jiggle valve 8 is located at a position corresponding to the cutout portion 4 of the first ring-shaped portion 2. The gasket 1 is arranged at an angle relative to the thermostat 6 so that the temporarily attached portion is located downward and the radially opposite side is located upward. In the temporarily attached portion of the gasket 1, a portion of the flange portion 7 is fitted into the groove portion 5 of the second ring-shaped portion 3. The retaining portion 15 holds the gasket 1 at the initial position P by coming into contact with a portion of the outer peripheral surface 3b of the second ring-shaped portion 3 of the obliquely arranged gasket 1.

[0029] The lid 13 includes a movable part 20 that moves along the inner circumferential surface of the gasket 1, and a drive mechanism 21 for manually driving the movable part 20.

[0030] The drive mechanism 21 includes a rotating shaft 22 rotatably held in the lid 13 while penetrating from the outside of the lid 13 (outside the mounting space S) to the inside of the lid 13 (inside the mounting space S), an operating handle 23 provided on the upper end of the rotating shaft 22 outside the lid 13, and a knob 24 provided on the operating handle 23. The axial direction (longitudinal direction) of the rotating shaft 22 extends along the vertical direction when the lid 13 is closed. The operating handle 23 extends along the radially outer side of the rotating shaft 22 and rotates integrally with the rotating shaft 22. In other words, the rotating shaft 22 rotates when the knob 24 is held by hand and the operating handle 23 is rotated. Although not shown, the rotating shaft 22 is preferably supported by the lid 13 via a bearing to ensure smooth rotation.

[0031] The drive mechanism 21 further includes a rotary plate 25 that rotates integrally with the rotary shaft 22 outside the lid 13 (outside the mounting space S), and a ball plunger 26 provided on the top surface of the lid 13.

[0032] A conical recess 25a into which the ball 26a at the tip of the ball plunger 26 is fitted is provided on the underside of the rotary plate 25. By fitting the ball 26a into the recess 25a, the operating handle 23 is fixed together with the rotary shaft 22 at a predetermined circumferential position.

[0033] The drive mechanism 21 further includes a support 27 provided at the lower end of the rotary shaft 22 inside the lid 13 (inside the mounting space S). The support 27 extends along the radially outer side of the rotary shaft 22 and rotates integrally with the rotary shaft 22. The movable part 20 is provided on the support 27 at a position spaced radially outward from the center line A1 of the rotary shaft 22. In other words, when the rotary shaft 22 is rotated by the operating handle 23, the movable part 20 moves on a circular orbit centered on the center line A1 of the rotary shaft 22 at a position spaced apart from the rotary shaft 22. In this embodiment, the phases of the operating handle 23 and the support 27 relative to the rotary shaft 22 are set so that the movable part 20 is automatically positioned at the initial position P when the lid 13 is closed with the operating handle 23 fixed by the ball plunger 26.

[0034] The movable part 20 is provided with an expanding part 28 on the lower side of the support body 27, which expands a part of the inner surface of the gasket 1 toward the outer diameter, and a pressing part 29 which presses the expanded part of the gasket 1 toward the thermostat 6 side (downward) and sequentially attaches it to the flange part 7.

[0035] In this embodiment, the expanded diameter portion 28 is cylindrical (pin-shaped) with a relatively small diameter, and the pressing portion 29 is cylindrical with a relatively large diameter. The expanded diameter portion 28 is provided integrally with the lower end of the pressing portion 29. The center line A2 of the expanded diameter portion 28 and the center line A3 of the pressing portion 29 are positioned coaxially and extend in the vertical direction when the lid 13 is closed. The expanded diameter portion 28 is rotatable integrally with the pressing portion 29 around the center lines A2 and A3. Although not shown, the movable portion 20 is preferably supported by the support body 27 via bearings so that the pressing portion 29 and the expanded diameter portion 28 can rotate smoothly.

[0036] When the rotating shaft 22 is rotated using the operating handle 23 from the state shown in Figure 4, the movable part 20 moves on a predetermined circular orbit along the inner surface 2a of the first ring-shaped part 2 of the gasket 1 while maintaining the pressing part 29 and the expanded diameter part 28 at a constant height.

[0037] At this time, as shown in FIG. 5, the gasket 1 is held by the holding portion 15 at the initial position P, so that the gasket 1 can be prevented from shifting in phase (shifting in position in the circumferential direction) with respect to the thermostat 6 during the mounting process.

[0038] Meanwhile, the movable portion 20 enters the inner peripheral surface 2a of the first ring-shaped portion 2 from the initial position P through the cutout portion 4. Thereafter, as shown in FIGS. 6 and 7, the contact portion 28a provided on the outer peripheral surface of the expanded diameter portion 28 of the movable portion 20 comes into contact with a part of the first ring-shaped portion 2 of the gasket 1 and the inner peripheral surface 2a. This contact between the contact portion 28a of the expanded diameter portion 28 and the inner peripheral surface 2a of the first ring-shaped portion 2 generates a force F1 that pushes the first ring-shaped portion 2 outward, expanding the diameter of the first ring-shaped portion 2. As a result, the second ring-shaped portion 3 is also pushed outward via the first ring-shaped portion 2, expanding its diameter.

[0039] Furthermore, contact portion 29a provided on the lower surface of pressing portion 29 of movable portion 20 comes into contact with a part of upper surface 2c of first ring-shaped portion 2, the diameter of which has been expanded by contact portion 28a of expanded diameter portion 28. This contact between contact portion 29a of pressing portion 29 and upper surface 2c of first ring-shaped portion 2 applies force F2 that presses first ring-shaped portion 2 downward. As a result, second ring-shaped portion 3 is also pressed downward via first ring-shaped portion 2.

[0040] As described above, by using the enlarged diameter portion 28 and the pressing portion 29 to press the first ring-shaped portion 2 downward while expanding its diameter, the second ring-shaped portion 3 is also pressed downward while expanding its diameter. Therefore, the groove 5 of the second ring-shaped portion 3 is fitted into the flange portion 7 of the thermostat 6 around the position where the forces F1 and F2 of the enlarged diameter portion 28 and the pressing portion 29, respectively, act. Then, by moving the movable portion 20 from the initial position P along the inner circumferential surface 2a of the first ring-shaped portion 2, the portion of the groove 5 of the second ring-shaped portion 3 that is fitted into and attached to the flange portion 7 of the thermostat 6 gradually expands from the initial position P in the circumferential direction of the flange portion 7. As a result, when the movable portion 20 moves along the circular orbit and reaches the initial position P again, the gasket 1 is attached to the entire circumference of the flange portion 7 of the thermostat 6, and the thermostat 6 with the gasket 1 shown in FIG. 3 is manufactured.

[0041] Therefore, by using the mounting device 11, the gasket 1 can be reliably mounted on the flange portion 7 of the thermostat 6 in a short time while preventing the gasket 1 from being out of phase with the thermostat 6.

[0042] The mounting device 11 according to this embodiment preferably further includes the following configuration.

[0043] As shown in Figures 6 and 7, the enlarged diameter portion 28 and the pressing portion 29, which are rotatable about the center lines A2 and A3, preferably roll along the inner circumferential surface 2a of the first ring-shaped portion 2. This reduces frictional resistance between the enlarged diameter portion 28 and the gasket 1 and between the pressing portion 29 and the gasket 1. As a result, the gasket 1 is less likely to be scratched, improving the quality of the thermostat 6 equipped with the gasket 1. Furthermore, the portion of the enlarged diameter portion 28 that constitutes the contact portion 28a and the portion of the pressing portion 29 that constitutes the contact portion 29a are sequentially replaced with each other as they roll, thereby extending the lifespan of the enlarged diameter portion 28 and the pressing portion 29.

[0044] FIG. 8 illustrates the positional relationship between the gasket 1 and the expanded diameter portion 28 after installation to the flange portion 7 (the completed installation state of FIG. 3). In FIG. 8, the diameter D1 of the circular orbit C1 along which the contact portion 28a of the expanded diameter portion 28 moves is preferably larger than the inner diameter D2 of the gasket 1 at the portion installed to the flange portion 7 (the diameter of the inner peripheral surface 3a of the second ring-shaped portion 3 in this embodiment). Note that the inner diameter D2 of the gasket 1 at the portion installed to the flange portion 7 refers to the inner diameter before elastic deformation. Furthermore, the center O1 of the circular orbit C1 of the contact portion 28a of the expanded diameter portion 28 is preferably offset by Δd in the direction away from the retaining portion 15 with respect to the center O2 of the gasket 1 at the completed installation state. Note that the center O2 of the gasket 1 at the completed installation state coincides with the center of the flange portion 7.

[0045] Due to this offset (Δd) of the circular orbit C1 of the contact portion 28a of the expanded diameter portion 28, the force (amount of expansion) with which the expanded diameter portion 28 pushes the gasket 1 toward the outer diameter side is reduced around the initial position P. In other words, when the area of ​​the portion of the gasket 1 that is attached to the flange portion 7 of the thermostat 6 is small and the frictional resistance between the gasket 1 and the flange portion 7 of the thermostat 6 is small, the amount of deformation of the gasket 1 is reduced, and it is possible to suppress the occurrence of misalignment of the gasket 1 with respect to the thermostat 6. In addition, because excessive deformation around the cutout portion 4 by the expanded diameter portion 28 is also suppressed, it is also possible to suppress the occurrence of damage such as tearing of the gasket 1.

[0046] On the other hand, due to the offset (Δd) of the circular orbit C1 of the contact portion 28a of the expanded diameter portion 28, the force F1 (amount of expansion) that pushes the gasket 1 outward by the expanded diameter portion 28 increases at positions away from the initial position P. The expanding force F1 is greatest at a position on the circular orbit C1 that is 180° circumferentially away from the initial position P. When the area of ​​the portion of the gasket 1 that is attached to the flange portion 7 of the thermostat 6 increases to a certain extent, the frictional resistance between the gasket 1 and the flange portion 7 of the gasket 1 increases, making it less likely that the gasket 1 will become misaligned relative to the thermostat 6 even if the amount of deformation of the gasket 1 increases. This makes it possible to more reliably prevent the gasket 1 from becoming misaligned relative to the thermostat 6.

[0047] Although not shown, it is preferable that the retaining portion 15 separates from the outer peripheral surface of the gasket 1 during the installation process, automatically releasing the retention of the gasket 1 by the retaining portion 15. Specifically, when the portion of the gasket 1 attached to the flange portion 7 of the thermostat 6 expands somewhat (e.g., about halfway around) in the circumferential direction of the flange portion 7 from the initial position P, the inclination of the gasket 1 at the initial position P decreases. This reduction in the inclination of the gasket 1 preferably causes the retaining portion 15 to separate from the outer peripheral surface of the gasket 1 during the installation process, automatically releasing the retention of the gasket 1 by the retaining portion 15. This makes it easier to remove the thermostat 6 with the gasket 1 attached after the installation process is completed. On the other hand, even if the retention of the retaining portion 15 is released during the installation process, the gasket 1 is unlikely to shift in phase with the thermostat 6. This is because, when the area of ​​the portion of the gasket 1 attached to the flange portion 7 of the thermostat 6 increases to a certain extent, the frictional resistance between the gasket 1 and the flange portion 7 of the gasket 1 increases.

[0048] Although the embodiment of the present invention has been described, the embodiment of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention.

[0049] In the above embodiment, the movable part 20 is moved manually, but the movable part 20 may be moved automatically (electrically).

[0050] In the above embodiment, the movable part 20 has been described as having both the enlarged diameter part 28 and the pressing part 29 capable of rolling along the gasket 1. However, only one of the enlarged diameter part 28 and the pressing part 29 may be configured to roll along the gasket 1. However, from the viewpoint of more reliably suppressing damage to the gasket 1 due to friction, it is preferable that both the enlarged diameter part 28 and the pressing part 29 be configured to roll along the contact portion of the gasket 1. In this case, the enlarged diameter part 28 and the pressing part 29 do not necessarily have to rotate on the same axis, and may each be composed of separate rolling elements. The pressing part 29 may be composed of a rotatable ball, a roller whose rotation axis is oriented laterally (for example, horizontally), or the like.

[0051] In the above embodiment, the gasket 1 has been described as having a two-stage structure including a first ring-shaped portion 2 and a second ring-shaped portion 3, but is not limited thereto. As shown in FIGS. 9 and 10 , the gasket 101 may have a single-stage structure including a single ring-shaped portion 102 having an annular groove 103 on its inner circumferential surface 102a, without any notch. When the installation device 11 is used in the installation process of this gasket 101, for example, the holding portion 15 contacts the outer circumferential surface 102b of the ring-shaped portion 102. Furthermore, for example, the enlarged diameter portion 28 contacts the inner circumferential surface 102a of the ring-shaped portion 102, and the pressing portion 29 contacts the end face (top surface) 102c of the ring-shaped portion 102.

[0052] In the above embodiment, the ring-shaped elastic member is a gasket and the workpiece is a thermostat, but the ring-shaped elastic member and the workpiece are not limited to these. The mounting device of the present invention can be applied to any workpiece having a flange portion and to any workpiece to be mounted on this flange portion. [Explanation of symbols]

[0053] 1 gasket 2. First ring-shaped portion 3 Second ring-shaped portion 4 Cutout 5 Groove 6. Thermostat 7 Flange 8 Jiggle Valve 11 Mounting device 12 Base 13 Lid 14 Placement section 15 Holding part 16 Hinge 17 Locking mechanism 18 Window section 19 Receiving hole 20 Moving parts 21 Drive mechanism 22 Rotation axis 23 Operating handle 24 Knob 25 Rotating Plate 26 Ball Plunger 27 Support 28 Expanded diameter part 28a Contact part 29 Pressing section 29a Contact part P initial position S Installation space

Claims

1. A ring-shaped elastic member mounting device for mounting a ring-shaped elastic member on a flange portion provided on an outer peripheral surface of a workpiece, comprising: a placement section on which the workpiece is placed; a holding portion that holds the ring-shaped elastic member at an initial position where a portion of the ring-shaped elastic member is temporarily attached to the flange portion of the workpiece placed on the placing portion; a movable portion that moves from the initial position along an inner circumferential surface of the ring-shaped elastic member, The movable portion includes an expanding portion that expands a portion of the inner peripheral surface of the ring-shaped elastic member toward the outer diameter side to expand the diameter, and a pressing portion that presses the expanded portion of the ring-shaped elastic member toward the workpiece to sequentially attach it to the flange portion.

2. 2. The mounting device for a ring-shaped elastic member according to claim 1, wherein the enlarged diameter portion is capable of rolling along the inner circumferential surface of the ring-shaped elastic member.

3. 3. A mounting device for a ring-shaped elastic member as described in claim 1 or 2, wherein the portion of the enlarged diameter portion that contacts the inner surface of the ring-shaped elastic member moves on a circular orbit, and the diameter of the circular orbit is larger than the inner diameter of the ring-shaped elastic member at the portion that is mounted to the flange portion.

4. 4. The mounting device for a ring-shaped elastic member according to claim 3, wherein the center of the circular orbit of the enlarged diameter portion is offset from the center of the flange portion in a direction away from the holding portion.

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