Manufacturing method of a rotary damper and a rotary damper

Abstract

To provide a manufacturing method of a rotary damper which enables a lid body to be assembled to a housing with high accuracy, and to provide the rotary damper.SOLUTION: In a manufacturing method of a rotary damper, a worker prepares a cylindrical housing body 102, a lid body 110 having a circular plate shape, and a shaft-like rotor 120. A housing side fitting part 103 configured to fit in a lid body side fitting part 111 formed at an outer periphery part of the lid body 110 is formed at an inner periphery part in the housing body 102, and the housing body 102 is formed of a material that causes plastic deformation more easily than the lid body 110. The lid body side fitting part 111 of the lid body 110 is formed with groove-like recessed parts 112a, 112b. The worker applies a pressure to the housing side fitting part 103 in a state that the lid body side fitting part 111 and the housing side fitting part 103 are fitted to cause a part of the housing side fitting part 103 to enter the recessed parts 112a, 112b and thereby form entering parts 104a, 104b.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rotary damper used as an energy attenuation device in a rotation mechanism of a four-wheeled self-propelled vehicle.

Background Art

[0002] Conventionally, for example, in a four-wheeled self-propelled vehicle, a rotary damper is used as an energy attenuation device in a rotation mechanism. For example, Patent Document 1 below discloses a rotary damper in which one opening in a cylindrical housing that houses a reciprocating rotor together with oil is hermetically closed by a flat ring-shaped plug (hereinafter referred to as a “lid”).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] However, in the rotary damper disclosed in Patent Document 1 above, since the lid is assembled to the housing by bending the peripheral edge of one opening of the housing inward, caulking processing for accurately and evenly bending the peripheral edge while preventing displacement of the lid in order to ensure liquid tightness and concentricity with respect to the rotor is difficult.

[0005] The present invention has been made to address the above problems, and an object thereof is to provide a method for manufacturing a rotary damper and a rotary damper that can accurately assemble a lid to a housing.

[0006] In order to achieve the above object, the present invention is characterized in that it includes a housing body having a cylindrical inner chamber for liquid-tightly accommodating a fluid and a fixed vane formed in a wall shape in the inner chamber to prevent the circumferential flow of the fluid, a rotor having a movable vane on the outer peripheral portion of the shaft body for partitioning the inner chamber while rotating while pushing the fluid toward the fixed vane side, and a lid provided on the housing body for liquid-tightly closing the inner chamber. The lid has an annular lid-side fitting portion that fits into the inner peripheral portion or the outer peripheral portion of the housing body. The housing body has an annular housing-side fitting portion that fits into the lid-side fitting portion. One of the lid-side fitting portion and the housing-side fitting portion is made of a material that is less likely to plastically deform than the other fitting portion, and a concave portion that is recessed toward the side separated from the other fitting portion is continuously or intermittently formed along the circumferential direction. A method for manufacturing a rotary damper, comprising an inserting portion forming step of applying pressure over the entire circumference of the other fitting portion that is more likely to plastically deform than the one fitting portion in a state where the lid-side fitting portion and the housing-side fitting portion are fitted to each other, so as to plastically deform a part of the other fitting portion in the radial direction and make it enter the concave portion. See, the insertion part is formed in the housing-side fitting part, and the housing-side fitting part is formed to project radially outward in a flange shape from the side surface of the housing body. The insertion part forming process is to fit the lid-side fitting part into the inner peripheral part of the housing-side fitting part and, while sandwiching the housing-side fitting part in the axial direction of the housing body, apply pressure to the housing-side fitting part in the axial direction of the housing body along the circumferential direction to form the insertion part. lies in.

[0007] According to this, in the method for manufacturing a rotary damper, in a state where the lid-side fitting portion in the lid and the housing-side fitting portion in the housing body are fitted to each other, by applying pressure in the radial direction over the entire circumference of the other fitting portion that is more likely to plastically deform than the one fitting portion, an inserting portion is formed in which a part of the other fitting portion enters the concave portion. Therefore, it is possible to suppress the positional deviation of the lid with respect to the housing body and assemble the lid with high precision.

[0008] Also, According to this, in the method for manufacturing a rotary damper, since the pressure is applied along the circumferential direction to the housing-side fitting portion in a state where the lid-side fitting portion is fitted to the inner peripheral portion of the housing-side fitting portion to form the inserting portion, it is possible to prevent the lid from becoming large and configure the rotary damper compactly.

[0009] Also, According to this, in the manufacturing method of the rotary damper, since pressure is applied from the axial direction of the housing to the housing-side fitting portion to form the insertion portion, the lid can be attached while preventing the wall thickness of the housing-side fitting portion from becoming thin.

[0010] Also, According to this, in the manufacturing method of the rotary damper, since pressure is applied in a state where the housing-side fitting portion that protrudes in a flange shape radially outward from the side surface of the housing is sandwiched from the axial direction of the housing to form the insertion portion, the housing-side fitting portion can be efficiently made to enter the concave portion to form the insertion portion.

[0011] Moreover, another feature of the present invention is that, in the manufacturing method of the rotary damper, two or more concave portions are formed in the axial direction of the housing main body, and the insertion portions are respectively formed in each of the two or more concave portions.

[0012] According to this, in the manufacturing method of the rotary damper, since the insertion portions are respectively formed in each of the two or more concave portions, the housing and the lid can be more firmly connected.

[0013] Moreover, another feature of the present invention is that, in the manufacturing method of the rotary damper, the two or more concave portions are formed with at least two different depths from each other.

[0014] According to this, in the manufacturing method of the rotary damper, since the two or more concave portions are formed with at least two different depths from each other, while improving the coupling force between the housing and the lid, the pressure required for forming the insertion portion can be suppressed to reduce the processing burden.

[0015] To achieve the above object, the present invention is characterized in that it includes a housing body having a cylindrical inner chamber for liquid-tightly accommodating a fluid and a fixed vane formed in the shape of a wall inside the inner chamber to prevent the circumferential flow of the fluid, a rotor having a movable vane on the outer peripheral portion of the shaft body for partitioning the inner chamber and rotating while pushing the fluid toward the fixed vane side, and a lid provided on the housing body for liquid-tightly closing the inner chamber. The lid has an annular lid-side fitting portion that fits into the inner peripheral portion or the outer peripheral portion of the housing body, and the housing body has an annular housing-side fitting portion that fits into the lid-side fitting portion. One of the lid-side fitting portion and the housing-side fitting portion is made of a material that is less likely to plastically deform than the other fitting portion, and a concave portion that is recessed toward the side separated from the other fitting portion is continuously or intermittently formed along the circumferential direction. A manufacturing method of a rotary damper, including an insertion portion forming step of forming an insertion portion in which a part of the other fitting portion that is more likely to plastically deform than the one fitting portion is plastically deformed in the radial direction and enters the concave portion by applying pressure over the entire circumference of the other fitting portion while the lid-side fitting portion and the housing-side fitting portion are fitted to each other. See, two or more concave parts are formed in the axial direction of the housing body, and the insertion part is formed in each of the two or more concave parts. The two or more concave parts are formed with at least two different depths from each other. It lies in this.

[0016] According to this, in the manufacturing method of the rotary damper, in a state where the lid-side fitting portion in the lid and the housing-side fitting portion in the housing body are fitted to each other, by applying pressure in the radial direction over the entire circumference of the other fitting portion that is more likely to plastically deform than the one fitting portion, an insertion portion is formed in which a part of the other fitting portion enters the concave portion. Therefore, it is possible to suppress the positional deviation of the lid with respect to the housing body and assemble the lid with high precision.

[0017] According to this, in the manufacturing method of the rotary damper, since the pressure is applied along the circumferential direction to the housing-side fitting portion in a state where the lid-side fitting portion is fitted to the inner peripheral portion of the housing-side fitting portion to form the insertion portion, it is possible to prevent the lid from becoming large and configure the rotary damper compactly.

[0018] Also, According to this, in the manufacturing method of the rotary damper, since the insertion portions are respectively formed in each of the two or more concave portions, the housing and the lid can be more firmly connected.

[0019] Also, According to this, in the manufacturing method of the rotary damper, since the two or more concave portions are formed at at least two different depths from each other, while improving the bonding strength between the housing and the lid, the pressure required for forming the insertion portion can be suppressed and the processing burden can be reduced.

[0020] Further, another feature of the present invention is that in the manufacturing method of the rotary damper, the concave portion is formed such that the cross-sectional area on the inner side is smaller than that on the opening side.

[0021] According to this, in the manufacturing method of the rotary damper, since the concave portion is formed such that the cross-sectional area on the inner side is smaller than that on the opening side, the pressure required for forming the insertion portion can be suppressed and the processing burden can be reduced.

[0022] Moreover, the present invention can be implemented not only as an invention of the manufacturing method of the rotary damper but also as an invention of the rotary damper.

[0023] Specifically, the rotary damper includes a housing body having a cylindrical inner chamber that liquid-tightly houses a fluid and having a fixed vane formed in a wall shape in the inner chamber to prevent the circumferential flow of the fluid, a rotor having a movable vane on the outer peripheral portion of the shaft body that partitions the inner chamber while rotating while pushing the fluid toward the fixed vane side, and a lid provided on the housing body to liquid-tightly close the inner chamber. In the rotary damper, the lid has an annular lid-side fitting portion that fits into the inner peripheral portion or the outer peripheral portion of the housing body, the housing body has an annular housing-side fitting portion that fits into the lid-side fitting portion, and one of the lid-side fitting portion and the housing-side fitting portion is made of a material that is less likely to plastically deform than the other fitting portion and has a concave portion that is recessed toward the side separated from the other fitting portion continuously or intermittently formed along the circumferential direction, and the other fitting portion has an entry portion formed such that a part of the other fitting portion enters the concave portion in a deformed state. That is, two or more concave parts are formed in the axial direction of the housing body, the insertion part is formed in each of the two or more concave parts, and the two or more concave parts are formed with at least two different depths from each other. That is. According to this, the rotary damper can exhibit the same operational effects as the invention of the manufacturing method of the rotary damper.

[0024] In this case, in the rotary damper, it is preferable that the concave portion is formed such that the cross-sectional area on the back side is smaller than that on the opening side.

[0025] Also, in these cases, in the rotary damper, the entry portion is formed in the housing-side fitting portion, and it is preferable that the housing-side fitting portion is formed to project radially outward in a flange shape from the side surface of the housing body. Also by these, the rotary damper can exhibit the same operational effects as the invention of the manufacturing method of the rotary damper.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

[0027] Hereinafter, a method for manufacturing a rotary damper according to the present invention and an embodiment of the rotary damper will be described with reference to the drawings. FIG. 1 is a perspective view schematically showing an overall configuration of a rotary damper 100. FIG. 2 is a parts exploded view showing parts constituting the rotary damper 100 shown in FIG. 1. FIG. 3 is a sectional view showing an outline of the internal structure of the rotary damper 100 shown in FIG. 1. FIG. 4 is a partially enlarged view showing an enlarged configuration within a broken line circle 3 shown in FIG. 3.

[0028] Note that each drawing referred to in this specification is schematically represented in part, such as by exaggerating some components to facilitate understanding of the present invention. For this reason, dimensions, ratios, etc. between components may be different.

[0029] This rotary damper 100 is a damping device that is attached to one of the components in a mechanism in which two components, such as a reclining seat, armrest, ottoman, glove box, tailgate, or back door of a four-wheel self-propelled vehicle (such as an automobile or a cart), tilt relative to each other, and that damps kinetic energy when the other component tilts.

[0030] (Configuration of Rotary Damper 100) The rotary damper 100 includes a housing 101. The housing 101 is a component that constitutes the housing of the rotary damper 100 while rotatably holding a rotor 120, and is made of various resin materials such as an aluminum material, an iron material, a zinc material, or a polyamide resin. Specifically, the housing 101 mainly includes a housing body 102 and a lid body 110.

[0031] The housing body 102 is a component that houses the movable vanes 124a and 124b of the rotor 120 and the fluid 130, which will be described later, and rotatably supports one end of the shaft body 121 of the rotor 120. It is formed in a bottomed cylindrical shape with one end of the cylindrical body having a large opening and the other end having a small opening. More specifically, the housing body 102 is formed such that the housing-side fitting portion 103, the inner chamber 105, and the rotor support portion 107 are connected in sequence from the side of the opening portion 102a that has a large opening at one end of the cylindrical body.

[0032] The housing-side fitting portion 103 is a portion where the lid body 110 is attached and holds the lid body 110, and is formed in an annular shape in plan view. More specifically, the housing-side fitting portion 103 is formed to project outward in the radial direction of the housing body 102 in a flange shape with respect to the outer peripheral portion of the portion where the inner chamber 105 is formed in the housing body 102.

[0033] In this case, the housing-side fitting portion 103 is formed such that the portion corresponding to the portion where the lid body 110 is attached projects outward in a flange shape. In the present embodiment, it is formed with a thickness greater than the thickness of the lid body 110. Note that the housing-side fitting portion 103 can also be formed with the same thickness as the lid body 110 or a thickness less than the thickness of the lid body 110. This housing-side fitting portion 103 is configured to include a housing-side fitting portion first end portion 103a, a housing-side fitting portion second end portion 103c, a housing-side fitting portion outer peripheral portion 103d, and a housing-side fitting portion inner peripheral portion 103e.

[0034] The housing-side fitting portion first end portion 103a constitutes one end of both ends in the axial direction of the housing-side fitting portion 103 and also constitutes the portion of the housing body 102 at the one end, and is formed in an annular shape in plan view. An insertion portion 103b is formed in the housing-side fitting portion first end portion 103a.

[0035] The pressing-in portion 103b is a portion that is plastically deformed into a concave shape when the pressing portion 221 of the housing punch 220, which will be described later, is pressed in. It is formed in an annular shape with a concave shape that is the reverse of the convex shape of the pressing portion 221. This pressing-in portion 103b is formed by work hardening at a position adjacent to the opening portion 102a, thereby holding the lid body 110 more firmly.

[0036] The second end portion 103c of the housing-side fitting portion is a portion that constitutes the other end portion of both end portions of the housing-side fitting portion 103 in the axial direction, and is formed in an annular shape when viewed from the bottom. This second end portion 103c of the housing-side fitting portion is received by the housing-side fitting portion receiver 202 in the lid body fixture 200, which will be described later, making it easier for a part of the housing-side fitting portion 103 to flow into the concave portions 112a and 112b, which will be described later. Therefore, the second end portion 103c of the housing-side fitting portion is formed on the side opposite to the first end portion 103a side of the housing-side fitting portion with respect to the concave portions 112a and 112b, but it is preferably formed in the vicinity of the concave portions 112a and 112b.

[0037] The outer peripheral portion 103d of the housing-side fitting portion constitutes the outer peripheral portion of the housing-side fitting portion 103 and also constitutes a part of the outer peripheral portion of the housing body 102, and is formed in a circular shape when viewed from the plane. This outer peripheral portion 103d of the housing-side fitting portion is formed in a tapered shape in which the outer diameter continuously decreases from the first end portion 103a side of the housing-side fitting portion toward the second end portion 103c side of the housing-side fitting portion. As a result, the housing-side fitting portion 103 is formed such that the radial thickness becomes thinner from the first end portion 103a side of the housing-side fitting portion toward the second end portion 103c side of the housing-side fitting portion.

[0038] The inner peripheral portion 103e of the housing-side fitting portion constitutes the inner peripheral portion of the housing-side fitting portion 103 and is a portion that holds the lid body 110, and is formed in a circular shape in plan view. The inner peripheral portion 103e of this housing-side fitting portion is formed with an inner diameter into which the outer peripheral portion of the lid body 110 is fitted. In this case, the inner peripheral portion 103e of the housing-side fitting portion is formed as a straight hole with a constant inner diameter from the housing-side fitting portion first end portion 103a side toward the housing-side fitting portion second end portion 103c side. Insertion portions 104a and 104b are respectively formed in the inner peripheral portion 103e of the housing-side fitting portion.

[0039] The insertion portions 104a and 104b are portions that have entered the concave portions 112a and 112b in the lid body 110 in a plastically deformed state. Therefore, the insertion portions 104a and 104b are made of a material that is more easily plastically deformed than the lid body-side fitting portion 111 in the lid body 110. In the present embodiment, the housing main body 102 as a whole is made of an aluminum material for the insertion portions 104a and 104b. The insertion portions 104a and 104b are formed in an annular shape that protrudes convexly inward in the radial direction of the housing-side fitting portion 103 from the surface of the inner peripheral portion 103e of the housing-side fitting portion.

[0040] The inner chamber 105 is a space that hermetically houses the fluid 130 together with the movable vanes 124a and 124b of the rotor 120, and is composed of two semi-cylindrical spaces facing each other through the rotor 120 disposed at the center in the housing main body 102. Fixed vanes 106a and 106b are integrally formed in these inner chambers 105 with the housing main body 102, respectively.

[0041] The fixed vanes 106a and 106b are wall-like portions that partition the inner chamber 105 together with the rotor 120 to form individual chambers R1 to R4 as shown in FIG. 5, and are formed to protrude convexly inward from the inner peripheral surface 105a of the inner chamber along the axial direction of the housing body 102. In this case, the fixed vanes 106a and 106b are formed to slide with a slight gap therebetween between the radially distal end portions and the outer peripheral surface of the shaft body 121 of the rotor 120, and between the end surfaces of one (the upper side in FIG. 3) of both axial end portions of the fixed vanes 106a and 106b and the lid body 110. By these respective gaps, the fixed vanes 106a and 106b are configured such that the fluid 130 slightly flows through the respective gaps when the shaft body 121 rotates. Further, these two fixed vanes 106a and 106b are provided at positions facing each other in the circumferential direction on the inner peripheral surface 105a of the inner chamber.

[0042] The rotor support portion 107 is a cylindrical portion that rotatably supports one end portion of the shaft body 121 of the rotor 120. This rotor support portion 107 supports the shaft body 121 of the rotor 120 in a liquid-tight manner via a sealing material made of an O-ring. Further, on the outer peripheral portion of the housing body 102, a mounting piece 108 for mounting to one of two components (not shown) to which the rotary damper 100 is to be mounted is formed to protrude outward in the radial direction.

[0043] As shown in FIG. 6, the lid body 110 is a component for liquid-tightly closing the inner chamber 105 formed in the housing body 102 and rotatably supporting the rotor 120, and is formed of various resin materials such as an aluminum material, an iron material, a zinc material, or a polyamide resin in a flat ring shape. This lid body 110 has a lid body side fitting portion 111 formed on the outer peripheral portion and a rotor support portion 113 formed on the inner peripheral portion, respectively.

[0044] The lid-side fitting portion 111 is the portion into which the above-described housing-side fitting portion 103 fits, and is formed in an annular shape that fits into the housing-side fitting portion 103. This lid-side fitting portion 111 is made of a material that is less likely to plastically deform than the housing-side fitting portion 103. In the present embodiment, the lid-side fitting portion 111 is such that the entire lid 110 is made of a steel material (carbon steel). On the surface of this lid-side fitting portion 111, concave portions 112a and 112b are formed.

[0045] The concave portions 112a and 112b are the portions that connect the lid 110 and the housing body 102 by allowing a part of the inner peripheral portion 103e of the housing-side fitting portion to enter and form the entry portions 104a and 104b, and are formed in a groove shape that is continuously recessed in a concave shape along the circumferential direction on the surface of the lid-side fitting portion 111. That is, the concave portions 112a and 112b are formed in an annular shape on the outer peripheral portion of the lid 110.

[0046] In this case, the concave portion 112a and the concave portion 112b are formed at positions adjacent to each other in the axial direction of the lid 110. Further, the concave portions 112a and 112b are formed in a triangular shape in which the cross-sectional area decreases from the opening toward the back side. In the present embodiment, the concave portions 112a and 112b are each formed in a triangular cross-sectional shape with a groove width of about 1 mm and a depth of about 0.5 mm.

[0047] The rotor support portion 113 is the portion that rotatably supports the shaft body 121 of the rotor 120, and is configured by a through-hole that penetrates the center portion of the lid 110. This lid 110 hermetically seals the inner chamber 105 through a sealing material 114 made of an O-ring provided on the upper end surface of the inner chamber 105 of the housing body 102 as shown in the figure.

[0048] The rotor 120 is disposed within the inner chamber 105 of the housing 101 and partitions the inner chamber 105 into four compartments, namely, compartment R1, compartment R2, compartment R3, and compartment R4. By rotating within the inner chamber 105, it increases or decreases the volume of each of these compartments R1, R2, R3, and R4. It mainly consists of a shaft body 121 and movable vanes 124a, 124b.

[0049] The shaft body 121 is a bottomed cylindrical portion that supports the movable vanes 124a, 124b and is made of various resin materials such as aluminum, iron, zinc, or polyamide resin. In this case, both ends of the outer peripheral portion of the shaft body 121 are slidably fitted and supported to the rotor support portion 107 of the housing main body 102 and the rotor support portion 113 of the lid body 110 via bearings 122a, 122b, respectively. Also, seal materials 123a, 123b made of O-rings are provided inside the bearings 122a, 122b at both ends of the outer peripheral portion of the shaft body 121, respectively, hermetically sealing the inner chamber 105.

[0050] In addition, a bottomed connecting portion 121a is formed on the end face of the shaft body 121 on the side of the lid body 110. The connecting portion 121a is a portion for connecting to the other component among the two components to which the rotary damper 100 is attached. In the present embodiment, the connecting portion 121a is formed with a hexagonal cross-sectional shape.

[0051] The movable vanes 124a and 124b are components for partitioning the inner chamber 105 into a plurality of spaces and for increasing or decreasing the volume of each of these spaces in a liquid-tight manner, and are each constituted by a plate-like body extending radially outward of the shaft body 121. In this case, the movable vanes 124a and 124b are located between the tip ends and the inner peripheral surface 105a of the inner chamber, between the end faces of the movable vanes 124a and 124b on one (upper side in FIG. 3) of the axial ends of the shaft body 121 and the lid body 110, and between the end faces of the movable vanes 124a and 124b on the other (lower side in FIG. 3) of the axial ends of the shaft body 121 and the bottom of the housing main body 102, and are each formed to slide with a slight gap therebetween. Due to each of these gaps, the movable vanes 124a and 124b are configured such that the fluid 130 slightly flows through each of the gaps when the shaft body 121 rotates. Further, these two movable vanes 124a and 124b are formed to extend in opposite directions (in other words, on a virtual same plane) via the shaft body 121.

[0052] The fluid 130 is a substance for imparting a damping function to the rotary damper 100 by applying resistance to the movable vanes 124a and 124b that rotate within the inner chamber 105, and fills the inner chamber 105. This fluid 130 is constituted by a liquid, gel-like, or semi-solid substance having fluidity with viscosity according to the specifications of the rotary damper 100. In this case, the viscosity of the fluid 130 is appropriately selected according to the specifications of the rotary damper 100. In the present embodiment, the fluid 130 is constituted by oil, for example, mineral oil or silicone oil. Note that in FIG. 5, the fluid 130 is shown only in the hatched area surrounded by a dashed-line circle.

[0053] (Manufacturing method of the rotary damper 100) Next, a manufacturing method of the rotary damper 100 configured as described above will be explained. For manufacturing the rotary damper 100, the lid attachment tool 200 is used. The lid attachment tool 200 is a mold for forming the insertion parts 104a and 104b to fixedly attach the lid body 110 to the housing main body 102, and is set and used in a press working machine (not shown). The lid attachment tool 200 mainly includes a housing pedestal 201, a lid presser 210, and a housing punch 220 respectively.

[0054] The housing pedestal 201 is a mold for holding the housing main body 102 while restricting the radial outward deformation of the housing main body 102. The housing pedestal 201 is formed in a concave shape with the outer peripheral shape of the housing main body 102 inverted. Specifically, the housing pedestal 201 is formed in a cylindrical shape with the opening 102a side and the rotor support part 107 side of the housing main body 102 opening respectively, and a housing side fitting part receiver 202 is formed on the inner peripheral part.

[0055] The housing side fitting part receiver 202 is a part for receiving the second end part 103c of the housing side fitting part 103 of the housing side fitting part in the housing main body 102. Specifically, the housing side fitting part receiver 202 is formed to project horizontally in an annular shape radially inward from the inner peripheral part of the housing pedestal 201. The housing pedestal 201 is arranged on the bolster (table) in the press working machine.

[0056] The lid retainer 210 is a component for pressing the lid body 110 against the housing body 102 on the housing body 102 set within the housing pedestal 201 to prevent displacement of the lid body 110. Specifically, the lid retainer 210 is formed in a disc shape when viewed from the bottom surface, and the outer edge portion of this disc body protrudes in an annular shape downward as shown in the figure. The portion protruding in this annular shape presses the outer edge portion of the lid body 110. This lid retainer 210 is supported by a lifting mechanism (not shown) in a press working machine via an operating rod 211 extending in the vertical direction shown in the figure, and is displaced in the vertical direction shown in the figure by the operation of this lifting mechanism. Thereby, the lid retainer 210 locks (presses) or unlocks (releases the pressure) the lid body 110.

[0057] The housing punch 220 is a component for pressing the housing side fitting portion 103 of the housing body 102 set within the housing pedestal 201 to form the insertion portions 104a and 104b. Specifically, the housing punch 220 is formed in an annular shape when viewed from the bottom surface, and the outer edge portion of this annular body protrudes in an annular shape downward as shown in the figure. The portion protruding in this annular shape presses the first end portion 103a of the housing side fitting portion 103 of the housing side fitting portion. In this case, a pressing portion 221 is formed on the tip surface of the portion protruding in an annular shape of the housing punch 220.

[0058] The pressing portion 221 is a portion for intensively pressing the inner edge portion at the first end portion 103a of the housing side fitting portion 103 of the housing side fitting portion, and is formed to continuously protrude in a convex shape along the circumferential direction from the lower end surface shown in the figure of the first end portion 103a of the housing side fitting portion. This housing punch 220 is supported by a slide in a press working machine (not shown) via an operating rod 222 extending in the vertical direction shown in the figure, and is driven in the vertical direction shown in the figure by the operation of this press working machine. Thereby, the housing punch 220 strikes the first end portion 103a of the housing side fitting portion 103 of the housing side fitting portion.

[0059] The operator first prepares the housing body 102, the lid body 110, and the rotor 120 respectively. These housing body 102, lid body 110, and rotor 120 are manufactured by known machining such as forging, pressing, and cutting. Here, the concave portions 112a, 112b in the lid body 110 are formed by pressing or cutting.

[0060] Next, as shown in FIG. 9, the operator sets (arranges) the housing body 102, the lid body 110, and the rotor 120 in the housing pedestal 201 respectively. In this case, the operator may arrange the housing body 102, the rotor 120, and the lid body 110 in order within the housing pedestal 201, or may arrange the housing body 102 in which the rotor 120 and the lid body 110 are arranged in the housing body 102 into the housing pedestal 201.

[0061] In any case, the lid body 110 is arranged in the housing pedestal 201 in a state where the lid - side fitting portion 111 is fitted into the housing - side fitting portion 103 of the housing body 102. Note that the rotor 120 is arranged with respect to the housing body 102 and the lid body 110 via a sealing material or a bearing. Also, a predetermined amount of fluid 130 is filled in the inner chamber 105 of the housing body 102.

[0062] Next, the operator operates a press to attach the lid body 110 to the housing body 102. Specifically, as shown in FIG. 10, the press lowers the lid retainer 210 to press the upper surface of the lid body 110 shown in the figure to fix the lid body 110. Next, as shown in FIG. 11, the press lowers the housing punch 220 to strongly press and push it into the first end portion 103a of the housing - side fitting portion of the housing - side fitting portion 103 of the housing body 102.

[0063] In this case, as shown in FIG. 12, since the pressing portion 221 of the housing punch 220 is formed to project convexly, this pressing portion 221 deeply bites into the first end portion 103a of the housing-side fitting portion and forms a pushing portion 103b in the first end portion 103a of the housing-side fitting portion. As a result, in the housing main body 102, a part of the housing-side fitting portion 103 enters the concave portions 112a and 112b of the lid body 110 through the inner peripheral portion 103e of the housing-side fitting portion by plastic deformation, respectively, and the insertion portions 104a and 104b are formed. The process in which a part of the housing-side fitting portion 103 enters the concave portions 112a and 112b by plastic deformation, respectively, and the insertion portions 104a and 104b are formed corresponds to the insertion portion forming process according to the present invention.

[0064] As a result, the lid body 110 is fixed to the housing-side fitting portion 103 of the housing main body 102. Also, in this case, since the lid body 110 receives a pressing force from the inner peripheral portion 103e of the housing-side fitting portion 103 of the housing-side fitting portion with a uniform force over the entire circumference of the outer peripheral portion, the lid body 110 is connected to the housing main body 102 without causing misalignment. The press machine immediately raises the housing punch 220 after striking it against the housing-side fitting portion 103. Further, after raising the housing punch 220, the press machine raises the lid retainer 210 to release the pressing state of the lid body 110 and finishes the attachment work of the lid body 110 to the housing main body 102.

[0065] Next, the operator takes out the rotary damper 100 in which the rotor 120 and the lid body 110 are assembled with respect to the housing main body 102 from the housing pedestal 201 and finishes the assembly work of the rotary damper 100. After that, the rotary damper 100 is completed through an inspection process and the like, but since it is not directly related to the present invention, the description thereof is omitted.

[0066] (Operation of Rotary Damper 100) Next, the operation of the rotary damper 100 configured as described above will be explained. This rotary damper 100 is provided between two relatively rotating parts and generates a damping force when one part rotates relative to the other part. Specifically, the rotary damper 100 is attached to one of the two relatively rotating parts via a connecting portion 121a and is attached to the other part via an attachment piece 108. Then, when the one part and the other part rotate relative to each other, the rotary damper 100 generates a damping force by the relative rotation of the rotor 120 with respect to the housing 101 (see the dashed arrow in FIG. 5).

[0067] Also in this case, since the lid 110 that rotatably supports one end of the shaft body 121 of the rotor 120 is attached to the housing body 102 without displacement, the rotor 120 can be rotated accurately without impairing the liquid tightness and fluidity of the fluid 130.

[0068] Note that as an article to which the rotary damper 100 is attached, it goes without saying that it can be attached and used for devices or appliances other than automobiles, specifically, door opening and closing mechanisms, mechanical devices other than self-propelled vehicles, electric devices, appliances, or furniture.

[0069] As can be understood from the description of the above operation method, according to the above embodiment, according to the manufacturing method of the rotary damper 100, in a state where the lid-side fitting portion 111 in the lid 110 and the housing-side fitting portion 103 in the housing body 102 are fitted to each other, a pressure is applied in the radial direction over the entire circumference of the housing-side fitting portion 103 that is more easily plastically deformed than the lid-side fitting portion 111, so that the housing-side fitting portion 103 forms the insertion portions 104a and 104b that enter into the concave portions 112a and 112b. Therefore, displacement of the lid 110 with respect to the housing body 102 can be suppressed and the lid 110 can be assembled accurately.

[0070] Furthermore, in practicing the present invention, it is not limited to the above-described embodiments, and various modifications are possible without departing from the object of the present invention. In the description of each modification example, the same reference numerals are given to the same parts as those in the above-described embodiments, and redundant descriptions are omitted.

[0071] For example, in the above-described embodiment, the housing punch 220 in the lid attachment 200 is configured to have a pressing portion 221 that protrudes in a convex shape. However, the housing punch 220 may be configured with a flat surface by omitting the pressing portion 221 at the portion that presses the first end portion 103a of the housing-side fitting portion, and hitting the first end portion 103a of the housing-side fitting portion with the entire flat surface. Further, the pressing portion 221 may be provided discontinuously instead of continuously in the circumferential direction.

[0072] Also, in the above-described embodiment, the lid attachment 200 is configured to include a lid retainer 210. However, the lid attachment 200 may be configured by omitting the lid retainer 210. In this case, the rotary damper 100 may fit the housing-side fitting portion 103 and the lid-side fitting portion 111 in a stronger fitting state (for example, a tight fit).

[0073] Also, in the above-described embodiment, the lid attachment 200 is configured such that the housing punch 220 presses the first end portion 103a of the housing-side fitting portion in the housing-side fitting portion 103. That is, the lid attachment 200 is configured to press the housing-side fitting portion 103 in the axial direction of the housing body 102. However, the lid attachment 200 may also be configured to press the housing-side fitting portion 103 in the radial direction of the housing body 102.

[0074] For example, FIG. 13 shows four housing punches 230 arranged on the radially outer side of the housing body 102 with respect to the housing-side fitting portion 103. Each of these housing punches 230 is formed with a pressing portion 231 having a triangular cross-sectional shape and protruding convexly at the tip. Then, these four housing punches 230 are displaced radially inward to press the outer peripheral portion 103d of the housing-side fitting portion 103 of the housing-side fitting portion 103 from the radially outer side of the housing body 102, thereby causing a part of the housing-side fitting portion 103 to enter the concave portions 112a and 112b to form the insertion portions 104a and 104b.

[0075] Also, in the above embodiment, the housing-side fitting portion 103 is formed by protruding the portion for fitting the lid body 110 in the housing body 102 in a flange shape outward in the radial direction. As a result, the lid body fixture 200 is configured to easily form the insertion portions 104a and 104b by plastically deforming a part of the housing-side fitting portion 103 toward the concave portions 112a and 112b by striking with the housing punch 230 in a state where the housing body 102 is received by the housing pedestal 201. However, the housing body 102 does not necessarily need to be formed with the housing-side fitting portion 103 protruding in a flange shape. For example, as shown in FIG. 14, the housing body 102 can also be configured as a cylindrical body in which a flat surface is continuously formed without protruding the housing-side fitting portion 103 in the axial direction.

[0076] Also, in the above embodiment, the concave portions 112a and 112b are formed in a groove shape that continuously extends along the circumferential direction of the lid body 110. However, the concave portions 112a and 112b can also be formed in a groove shape or a bottomed hole shape that is intermittently formed along the circumferential direction of the lid body 110.

[0077] Also, in the above embodiment, two concave portions 112a and 112b are formed side by side in the axial direction of the housing body 102 on the side surface of the lid body 110. However, at least one concave portion 112a or 112b can also be formed on the side surface of the lid body 110, or three or more can be formed side by side in the axial direction of the housing body 102.

[0078] Further, in the above-described embodiment, the concave portions 112a and 112b are formed to have the same depth. However, the concave portions 112a and 112b can also be formed to have different depths. In this case, the depth of the concave portion (for example, the concave portion 112b) on the side relatively far from the housing punch 230 can be made shallower than the depth of the concave portion (for example, the concave portion 112a) on the side relatively close to the housing punch 230, thereby suppressing the pressing force of the housing punch 230 and reducing the processing burden.

[0079] Further, in the above-described embodiment, the concave portions 112a and 112b are formed to have a triangular cross-sectional shape in which the cross-sectional area on the back side from the opening side is smaller. According to this, the lid body 110 can suppress the pressure required for forming the insertion portions 104a and 104b and reduce the processing burden. However, as shown in FIG. 15, the concave portions 112a and 112b can also be formed on a curved surface such as a semi-circular shape in which the cross-sectional area on the back side from the opening side is smaller. By forming the deepest part of the concave portions 112a and 112b into a curved surface in this way, the filling rate of the insertion portions 104a and 104b can be increased, and the occurrence of damage such as cracks in the concave portions 112a and 112b can be suppressed.

[0080] Further, the concave portions 112a and 112b can be formed to have a rectangular cross-sectional shape in which the cross-sectional area is constant from the opening side toward the back side. Further, as shown in FIG. 16, the concave portions 112a and 112b have a triangular cross-sectional shape in which the cross-sectional area on the back side from the opening side is smaller, and one side 115b on the side of the second end portion 103c of the housing-side fitting portion among the two adjacent sides 115a and 115b is formed at a right angle with respect to the axial direction of the housing body 102 or at an acute angle toward the side of the second end portion 103c of the housing-side fitting portion, and the side 115a on the side of the first end portion 103a of the housing-side fitting portion is formed at an acute angle toward the side of the second end portion 103c of the housing-side fitting portion with respect to the axial direction of the housing body 102, so that the lid body 110 can be made difficult to come off.

[0081] In the above-described embodiment, the lid 110 is configured to be fitted into the opening 102a of the housing body 102. That is, the rotary damper 100 is configured such that the housing-side fitting portion 103 is formed in a cylindrical shape and the lid-side fitting portion 111 is formed in a disc shape, and the outer peripheral portion of the lid-side fitting portion 111 is fitted into the inner peripheral portion of the housing-side fitting portion 103. However, as shown in FIG. 17, the rotary damper 100 may be configured such that the housing-side fitting portion 103 is formed in a columnar or cylindrical shape and the lid-side fitting portion 111 is formed in a cylindrical shape having a size that fits outside the housing-side fitting portion 103, and the inner peripheral portion of the lid-side fitting portion 111 is fitted into the outer peripheral portion of the housing-side fitting portion 103. In this case, in the rotary damper 100, the concave portions 112a and 112b are formed in the outer peripheral portion 103d of the housing-side fitting portion, and the insertion portions 104a and 104b are formed in the lid-side fitting portion 111. Therefore, the operator can cause the insertion portions 104a and 104b to enter the concave portions 112a and 112b by pressing the lid-side fitting portion 111 from the radially outer side or restricting the radially outer side of the lid-side fitting portion 111 with a mold (not shown) and pressing the lid-side fitting portion 111 from the axial direction.

[0082] The rotary damper 100 may be configured with a material (for example, an aluminum material) that is more easily plastically deformed than the housing body 102 for the lid 110, and a material (for example, carbon steel) that is less easily plastically deformed than the lid 110 for the housing body 102. In this case, concave portions 112a and 112b are formed in the outer peripheral portion 103d of the housing-side fitting portion in the housing body 102. Then, the lid attachment tool 200 can attach the lid 110 to the housing body 102 by pressing the lid-side fitting portion 111 in the lid 110 in the axial direction or radially inward to cause a part of the lid-side fitting portion 111 to enter the concave portions 112a and 112b and form the insertion portions 104a and 104b.

Explanation of Reference Numerals

[0083] R1 to R4... individual chambers 100…Rotary damper, 101…Housing, 102…Housing body, 102a…Opening, 103…Housing side fitting part, 103a…First end part of housing side fitting part, 103b…Pushing-in part, 103c…Second end part of housing side fitting part, 103d…Outer peripheral part of housing side fitting part, 103e…Inner peripheral part of housing side fitting part, 104a, 104b…Insertion part, 105…Inner chamber, 105a…Inner peripheral surface of inner chamber, 106a, 106b…Fixed vane, 107…Rotor support part, 108…Mounting piece, 110…Cover body, 111…Cover body side fitting part, 112a, 112b…Concave part, 113…Rotor support part, 114…Sealing material, 115a, 115b…Two sides constituting the concave part, 120…Rotor, 121…Shaft body, 121a…Connecting part, 122a, 122b…Bearings, 123a, 123b…Sealing materials, 124a, 124b…Movable vanes, 130…Fluid, 200…Cover body fixture, 201…Housing pedestal, 202…Receiver for housing side fitting part, 210…Cover body presser, 211…Actuating rod, 220…Housing punch, 221…Pressing part, 222…Actuating rod, 230…Housing punch, 231…Pressing part.

Claims

1. A housing body having a cylindrical inner chamber that liquid-tightly accommodates a fluid, and having a fixed vane formed in a wall shape within the inner chamber to prevent circumferential flow of the fluid; A rotor having a movable vane on the outer peripheral portion of a shaft body that partitions the inner chamber while rotating while pushing the fluid toward the fixed vane side; A lid provided on the housing body to liquid-tightly close the inner chamber, The lid body, Has an annular lid-side fitting portion that fits into the inner peripheral portion or the outer peripheral portion of the housing body, The housing body, Has an annular housing-side fitting portion that fits into the lid-side fitting portion, A manufacturing method of a rotary damper, wherein one of the lid-side fitting portion and the housing-side fitting portion is made of a material that is less likely to plastically deform than the other fitting portion, and a concave portion that is recessed toward the separating side with respect to the other fitting portion is continuously or intermittently formed along the circumferential direction, In a state where the lid-side fitting portion and the housing-side fitting portion are fitted to each other, a pressure is applied over the entire circumference of the other fitting portion that is more likely to plastically deform than the one fitting portion, so that a part of the other fitting portion is plastically deformed in the radial direction and an inserted portion that enters the concave portion is formed, including an inserted portion forming step, The inserted portion is formed in the housing-side fitting portion, The housing-side fitting portion, Is formed to project radially outward in a flange shape from the side surface of the housing body, The inserted portion forming step, The lid-side fitting portion is fitted into the inner peripheral portion of the housing-side fitting portion, and in a state where the housing-side fitting portion is sandwiched from the axial direction of the housing body, A method for manufacturing a rotary damper, characterized in that a pressure is applied to the housing-side fitting portion from the axial direction of the housing body along the circumferential direction with respect to the housing-side fitting portion to form the inserted portion.

2. In the method for manufacturing a rotary damper according to Claim 1, The concave portion, Two or more are formed in the axial direction of the housing body, The inserted portion, A method for manufacturing a rotary damper, characterized in that each of the two or more concave portions is formed.

3. In the method for manufacturing a rotary damper according to Claim 2, The two or more concave portions, A method for manufacturing a rotary damper, characterized in that they are formed with at least two different depths from each other.

4. A housing body having a cylindrical inner chamber that liquid-tightly accommodates a fluid and having a fixed vane formed in a wall shape in the inner chamber to prevent circumferential flow of the fluid; A rotor having a movable vane on the outer peripheral portion of a shaft body that partitions the inner chamber and rotates while pushing the fluid toward the fixed vane side; A lid provided on the housing body to liquid-tightly close the inner chamber, The lid, Has an annular lid-side fitting portion that fits into the inner peripheral portion or the outer peripheral portion of the housing body, The housing body, Has an annular housing-side fitting portion that fits into the lid-side fitting portion, A method for manufacturing a rotary damper, wherein one of the lid-side fitting portion and the housing-side fitting portion is made of a material that is less likely to plastically deform than the other fitting portion, and a concave portion that is recessed toward the side away from the other fitting portion is continuously or intermittently formed along the circumferential direction; In a state where the lid-side fitting portion and the housing-side fitting portion are fitted to each other, a pressure is applied over the entire circumference of the other fitting portion that is more likely to plastically deform than the one fitting portion, so that a part of the other fitting portion is plastically deformed in the radial direction to form an inserted portion that enters the concave portion, including an inserted portion forming step; The concave portion, Two or more are formed in the axial direction of the housing body, The inserted portion, Is formed in each of the two or more concave portions, The two or more concave portions, A method for manufacturing a rotary damper, characterized in that they are formed with at least two different depths from each other.

5. In the method for manufacturing a rotary damper according to any one of Claims 1 to 4, The concave portion, A method for manufacturing a rotary damper, characterized in that the cross-sectional area on the back side from the opening side is formed to be smaller.

6. A housing body having a cylindrical inner chamber that liquid-tightly accommodates a fluid and having a fixed vane formed in a wall shape in the inner chamber to prevent circumferential flow of the fluid; A rotor having a movable vane on the outer peripheral portion of a shaft body that partitions the inner chamber and rotates while pushing the fluid toward the fixed vane side; In a rotary damper including a lid provided on the housing body to liquid-tightly close the inner chamber, The lid, Has an annular lid-side fitting portion that fits into the inner peripheral portion or the outer peripheral portion of the housing body, The housing body, It has an annular housing-side fitting portion that fits into the lid-side fitting portion. One of the lid-side fitting portion and the housing-side fitting portion is made of a material that is less likely to plastically deform than the other fitting portion, and a concave portion that is recessed toward the side separated from the other fitting portion is continuously or intermittently formed along the circumferential direction. The other fitting portion is formed with an insertion portion that enters the concave portion in a state where a part of the other fitting portion is deformed. The concave portion is formed in two or more in the axial direction of the housing body. The insertion portion is formed in each of the two or more concave portions. The two or more concave portions are characterized in that they are formed with at least two different depths from each other. A rotary damper.

7. In the rotary damper according to claim 6, The concave portion is characterized in that the cross-sectional area on the inner side is smaller than that on the opening side. A rotary damper.

8. In the rotary damper according to claim 6, The insertion portion is formed in the housing-side fitting portion. The housing-side fitting portion is characterized in that it is formed to project radially outward in a flange shape from the side surface of the housing body. A rotary damper.

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