JP2007225118A - Rotary damper and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent degradation of a characteristic and breakage by enhancing joint strength of a plug to a housing. <P>SOLUTION: This rotary damper has: partition walls 3 for partitioning a space formed between a rotor 2 and a housing 1 for housing the rotor to form fluid chambers filled with fluid; vanes 4 arranged in the fluid chambers; and a plug 5 jointed to the housing by caulking an edge of an opening of the housing for closing the opening of the housing. The plug 5 is provided with: collar parts 5a for installation; and step parts 5c allowing a part of a roller for caulking the edge of the opening of the housing to circle and run along the circumferential edge of the housing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary damper that partitions a space formed between a rotor and a housing that accommodates the rotor, forms a fluid chamber filled with fluid, and a vane provided in the fluid chamber; The present invention relates to a method for manufacturing the rotary damper.

Conventionally, as a rotary damper having a partition formed between a rotor and a housing that accommodates the rotor, a partition wall that forms a fluid chamber filled with fluid, and a vane provided in the fluid chamber, For example, what was disclosed by Unexamined-Japanese-Patent No. 2002-81482 (patent document 1) is known.
In this type of rotary damper, the rotational movement of the controlled object is slowed down by the resistance generated when the fluid pressed by the vane swinging in the fluid chamber moves through a slight gap between the vane and the housing. Can be made.

However, in the conventional rotary damper, although the partition wall is integrally formed with the housing, there is a problem that the manufacturing cost is high because a casting method such as zinc die casting is generally adopted as the forming means. There was a drawback that the weight of the molded product was heavy.
In addition, the shape and dimensions of the buttock used when installing the rotary damper are designed according to the installation object, but the buttock is provided in the housing. Had to make a mold for the entire housing including.
Moreover, in the rotary damper joined by caulking the edge of the opening of the housing formed by zinc die casting, there is a problem that deformation due to creep is likely to occur in the caulked portion due to internal pressure.

JP 2002-81482 A

  The present invention has been made in view of the above circumstances, so that the weight of the product can be reduced and the manufacturing cost can be reduced, and the design change of the shape and dimensions of the installation collar can be easily performed at a low cost. It is another object of the present invention to further improve the bonding strength of the plug to the housing to prevent deterioration and damage of the characteristics.

In order to solve the above-described problems, the present invention provides the following rotary damper and method for manufacturing the rotary damper.
1. Partitioning a space formed between the rotor and the housing that accommodates the rotor, partition walls forming a fluid chamber filled with fluid, vanes provided in the fluid chamber, and edges of the opening of the housing A rotary damper having a plug joined to the housing by caulking and closing the opening of the housing;
The plug is provided with a flange for installation and a stepped portion that allows a part of a roller for caulking the edge of the opening of the housing to turn along the outer peripheral edge of the housing. Rotary damper characterized by that.
2. Partitioning a space formed between the rotor and a housing that accommodates the rotor, and forming a partition that forms a fluid chamber filled with fluid, a vane provided in the fluid chamber, and a flange for installation A method of manufacturing a rotary damper having a plug that closes the opening of the housing,
The plug is provided with a step portion that allows a part of the roller that caulks the edge of the opening of the housing to turn along the outer peripheral edge of the housing,
As the roller, on the outer periphery of the roller, a part that abuts the edge of the opening of the housing and pushes and bends the edge. A method for manufacturing a rotary damper, comprising a step of joining the plug to the housing by caulking the edge of the opening of the housing using a part having a turning traveling portion.

According to the present invention, since the plug that closes the opening of the housing has the installation flange, it is necessary to manufacture a mold for molding the housing even if the design and dimensions of the flange are changed. Therefore, it is sufficient to prepare a mold for forming a plug having a simple structure as compared with the housing. Therefore, the design change of the shape and dimensions of the collar portion can be facilitated at low cost.
In addition, since the plug is provided with a step portion that allows a part of the roller that caulks the edge of the opening of the housing to swivel along the outer peripheral edge of the housing, the housing is pushed and bent by the roller. The edge of the opening can be brought into close contact with the plug, and the bonding strength of the plug to the housing can be further improved.

  The embodiments of the present invention will be described below with reference to the examples shown in the drawings, but the present invention is not limited to these examples.

  As shown in FIGS. 1 to 4, the rotary damper according to this embodiment includes a housing 1, a rotor 2, a partition wall 3, a vane 4, and a plug 5.

  As shown in FIG. 2, the housing 1 includes an outer wall 1a having a substantially circular cross section that forms the outer peripheral surface of the housing 1 and a bottom wall 1c that closes one end of the housing 1, and further from the outer wall 1a. And an inner wall 1b having a substantially circular cross section and a small diameter. The inner wall 1b plays a role of supporting a rotor 2 described later. Further, by providing the inner wall 1b, there is an advantage that it is possible to create a space for disposing a seal member that prevents fluid leakage. In FIG. 2, reference numerals 6a and 6b denote O-rings as seal members.

  As shown in FIG. 3, the rotor 2 includes a large diameter portion 2a having an outer diameter slightly smaller than the inner diameter of the outer wall 1a of the housing 1, a small diameter portion 2b having an outer diameter smaller than the large diameter portion 2a, And a hole 2c having a substantially square cross section penetrating along the axis. The rotor 2 is rotatably accommodated in the housing 1 with the inner wall 1b of the housing 1 being inserted into a groove formed in the end surface of the small diameter portion 2b.

  As shown in FIGS. 4 to 6, the partition wall 3 is molded integrally with the housing 1 so as to protrude from the inner peripheral surface of the outer wall 1a of the housing 1 toward the axial center. In this embodiment, press working is adopted. That is, the housing 1 in which the partition wall is integrally formed is processed using a press machine using a steel plate as a raw material. Thereby, compared with what was shape | molded by casting methods, such as zinc die-casting, the weight of a product can be reduced lightly and manufacturing cost can be reduced significantly. As its manufacturing method, it can manufacture, for example with the following processes.

  First, in the first step, as shown in FIG. 8, the outer wall 1a and the bottom wall 1c of the housing 1 are formed from a steel plate, and at the same time, the portion forming the inner wall 1b of the housing 1 is somewhat raised from the bottom wall 1c. To form. Next, in the second step, as shown in FIG. 9, the portion forming the inner wall 1b of the housing 1 is completely raised from the bottom wall 1c, and the upper portion of the raised portion is punched to form the inner wall 1b. . Next, in the third step, as shown in FIG. 10, the part forming the partition wall portion 3 is molded so as to protrude somewhat from the inner peripheral surface of the outer wall 1 a of the housing 1. Next, in the fourth step, as shown in FIG. 11, the partition wall 3 is formed by completely projecting the portion forming the partition wall 3 from the inner peripheral surface of the outer wall 1 a of the housing 1. Then, in the final step, as shown in FIG. 12, unnecessary portions existing at the end of the inner wall 1b of the housing 1 and the end of the outer wall 1a forming the opening of the housing 1 are removed. The housing 1 in which the portion 3 is integrally formed is completed. Note that the edge 1d of the opening of the completed housing 1 is formed in a predetermined shape so that the plug 5 described later can be firmly joined to the housing 1 by being caulked as described later.

  As shown in FIG. 4, the partition wall 3 integrally molded with the housing 1 as described above is molded so that the front end surface thereof is in sliding contact with the outer peripheral surface of the small diameter portion 2 b of the rotor 2. The space formed between the rotor 2 and the housing 1 is partitioned, and a fluid chamber in which a fluid such as silicon oil is filled in the housing 1 is formed.

  The vane 4 is formed integrally with the rotor 2 so as to protrude from the outer peripheral surface of the small diameter portion 2 b of the rotor 2 toward the inner peripheral surface of the housing 1. The vane 4 is disposed in the fluid chamber, and its front end surface is in sliding contact with the inner peripheral surface of the housing 1, so that the fluid chamber has two chambers (hereinafter referred to as “first chamber” and “first chamber”, respectively). It is divided into 7 rooms and 7b. The fluid flows between the first chamber 7a and the second chamber 7b through a gap formed between the vane 4 and the housing 1 or the like.

  The opening portion of the housing 1 is closed by a plug 5 after the rotor 2 and the vane 4 are disposed in the housing 1 and filled with fluid. The plug 5 is shown in FIGS. And as shown in FIG. 14, it is preferable to have the collar part 5a for installing a rotary damper in an installation target object. Since the plug 5 has the installation flange 5a, there is no need to manufacture a mold for molding the housing as in the past even if there is a design change in the shape and dimensions of the flange 5a. In comparison, it suffices to prepare a mold for forming the plug 5 having a simple configuration, and therefore, the design change of the shape and dimensions of the flange portion 5a can be facilitated at low cost.

  In addition, the plug 5 having the installation flange 5a is preferably formed by press working using a steel plate as a raw material, thereby further reducing the manufacturing cost of the entire rotary damper. Further, the plug 5 is provided with a step portion 5c that allows a part of the roller 8 that caulks the edge 1d of the opening of the housing 1 to turn along the outer peripheral edge of the housing 1. Is preferred.

  The plug 5 molded as described above is preferably joined to the housing 1 by caulking the edge 1 d of the opening of the housing 1. What is joined by caulking the edge 1d of the opening of the housing 1 formed by pressing a steel plate is joined by caulking the edge of the opening of the housing formed by conventional zinc die casting. This is because the bonding strength of the plug to the housing can be improved as compared with the above, and it is possible to prevent deterioration in characteristics and damage caused by deformation of the caulked portion due to internal pressure.

  Further, for example, as shown in FIG. 15, the plug 5 is lowered into the housing 1 by using a caulking device including a roller 8 that can be lowered while swiveling and can caulk the edge 1 d of the opening of the housing 1. It is preferable to be joined. The roller 8 of the caulking device has a portion that abuts the edge 1d of the opening of the housing 1 and pushes and bends the edge 1d on the outer periphery of the roller 8 and protrudes outward from the portion. And a portion 8a that turns around the vehicle. On the other hand, since the plug 5 is provided with the step portion 5c described above, the edge 1d of the opening of the housing 1 pressed and bent by the roller 8 can be brought into close contact with the plug 5, and the plug 5 can be joined to the housing 1. This is because the strength can be further improved.

  The rotary damper configured as described above is used as follows. That is, first, a fixing tool such as a screw or a bolt is inserted into the hole 5b formed in the flange 5a, and the plug 5 having the flange 5a is fixed to a predetermined installation object by the fixing tool. Since the plug 5 is joined to the housing 1, the housing 1 is also fixed by fixing the plug 5 to the installation target. Here, the housing 1 is non-rotatably joined to the plug 5.

  A hole 5d through which a shaft (not shown) of the control object is inserted is formed at substantially the center of the plug 5, and the shaft of the control object is a hole formed in the rotor 2 through the hole 5d. The portion 2 c is inserted and connected to the rotor 2.

  And if the axis | shaft connected with the rotor 2 rotates with rotation operation of a control object, the rotor 2 will rotate in the housing 1, and the vane 4 will rock | fluctuate in a fluid chamber in connection with this. For example, in FIG. 4, if the vane 4 swings in the clockwise direction, the fluid in the first chamber 7a is compressed between the vane 4 and the partition wall 3, and the fluid in the first chamber 7a is Then, it moves into the second chamber 7 b through a slight gap formed between the vane 4 and the housing 1. The rotational force of the rotor 2 is attenuated by the resistance of the fluid generated at this time, and the rotational operation of the controlled object connected to the rotor 2 via the shaft becomes slow.

  In the rotary damper according to the present embodiment, a configuration is adopted in which a resistance is generated in the fluid and a damping force is exhibited even when the vane 4 swings in either the clockwise direction or the counterclockwise direction. However, for example, a configuration in which a damping force is exhibited only when the vane 4 swings in one direction by forming a fluid passage in the vane 4 and providing a check valve in the fluid passage may be employed. it can. Further, in the rotary damper according to the present embodiment, two partition walls 3 integrally formed with the housing 1 are provided so as to face each other with the rotor 2 interposed therebetween, but even if there is only one partition wall 3. Good.

It is a top view which shows the rotary damper which concerns on one Example of this invention. It is an AA section sectional view in FIG. It is a BB section sectional view in FIG. It is CC sectional view taken on the line in FIG. It is a top view of a housing. FIG. 6 is a cross-sectional view taken along a line DD in FIG. 5. It is EE section sectional drawing in FIG. It is a figure for demonstrating the 1st process at the time of shape | molding a housing by press work, (a) is a top view, (b) is FF part sectional drawing in (a). It is a figure for demonstrating the 2nd process at the time of shape | molding a housing by press work, (a) is a top view, (b) is GG section sectional drawing in (a). It is a figure for demonstrating the 3rd process at the time of shape | molding a housing by press work, (a) is a top view, (b) is HH part sectional drawing in (a). It is a figure for demonstrating the 4th process at the time of shape | molding a housing by press work, (a) is a top view, (b) is the II section sectional drawing in (a). It is a figure for demonstrating the last process at the time of shape | molding a housing by press work, (a) is a top view, (b) is JJ part sectional drawing in (a). It is a top view of a plug. It is KK part sectional drawing in FIG. It is a figure for demonstrating the method to attach a plug to a housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Rotor 3 Partition part 4 Vane 5 Plug 5a Eave part 6a, 6b O-ring 7a 1st chamber 7b 2nd chamber 8 Roller

Claims (2)

Partitioning a space formed between the rotor and the housing that accommodates the rotor, partition walls forming a fluid chamber filled with fluid, vanes provided in the fluid chamber, and edges of the opening of the housing A rotary damper having a plug joined to the housing by caulking and closing the opening of the housing;
The plug is provided with a flange for installation and a stepped portion that allows a part of a roller for caulking the edge of the opening of the housing to turn along the outer peripheral edge of the housing. Rotary damper characterized by that. Partitioning a space formed between the rotor and a housing that accommodates the rotor, and forming a partition that forms a fluid chamber filled with fluid, a vane provided in the fluid chamber, and a flange for installation A method of manufacturing a rotary damper having a plug that closes the opening of the housing,
The plug is provided with a step portion that allows a part of the roller that caulks the edge of the opening of the housing to turn along the outer peripheral edge of the housing,
As the roller, on the outer periphery of the roller, a part that abuts the edge of the opening of the housing and pushes and bends the edge, and protrudes outward from the part and caulked along the outer peripheral edge of the housing. A method for manufacturing a rotary damper, comprising a step of joining the plug to the housing by caulking the edge of the opening of the housing using a part having a turning traveling portion.

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