JP2015155722A - rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper which makes engagement of gears less likely to deteriorate and eliminates need for special consideration for fixing a housing.

SOLUTION: The invention relates to a rotary damper including: an operation chamber 11 formed in a housing 10; a rotor 12 provided in the operation chamber 11; and a medium 13 which causes resistance to rotation of the rotor 12. The rotary damper includes: a gear chamber 14 formed in the housing 10; and two or more gears which are provided at the gear chamber 14 and transmit power to the rotor 12. The gears include a first gear 15 connected with a shaft of a control object.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a rotary damper that reduces the rotational speed of an object that rotates, for example, an automobile part such as a seat back or a tailgate.

  2. Description of the Related Art Conventionally, a working chamber that is formed in a housing, a rotor provided in the working chamber, and a medium that resists rotation of the rotor, and that makes a rotational motion by attenuating the rotational force of the rotor ( There is known a rotary damper that decelerates the rotation speed of a control object.

  Conventionally, a technique for transmitting power to a rotor using two or more gears in order to rotate the rotor is known.

  For example, Japanese Patent Laid-Open No. 11-276282 discloses a first gear (first gear 2) attached to a shaft (rotation support shaft 13) of a control object (seat back 110) and an outer side of a housing (main body case 42). And a second gear (second gear 3) which is attached to the rotor (rotor 41) and meshes with the first gear, and the power generated by the rotational motion of the controlled object is the shaft of the controlled object and the second gear. The structure transmitted to a rotor via 1 gear and 2nd gear is disclosed.

  However, in the conventional technique, the first gear connected to the shaft of the object to be controlled is independent of the rotary damper, and therefore, when the housing is fixed, consideration must be given to how the first gear and the second gear are engaged. I had to.

  Moreover, in the prior art, since there is nothing to support the end of the shaft of the object to be controlled, the first gear is not stabilized, and as a result, the meshing between the first gear and the second gear may be deteriorated. was there.

Japanese Patent Laid-Open No. 11-276282

  The problem to be solved by the present invention is to provide a rotary damper in which the meshing of the gears hardly deteriorates and does not require special consideration when fixing the housing.

  In order to solve the above problems, the present invention provides a rotary damper comprising a working chamber formed in a housing, a rotor provided in the working chamber, and a medium that provides resistance to rotation of the rotor. A gear chamber formed therein, and two or more gears provided in the gear chamber for transmitting power to the rotor, wherein the gear includes a first gear coupled to the shaft of the object to be controlled. A rotary damper is provided.

  Since the present invention includes a first gear that is connected to the shaft of the control object, the gear provided in the gear chamber only has to connect the first gear to the shaft of the control object so that the meshing state of the gears is hindered. The fixed position of the housing is determined without coming. Therefore, according to the present invention, it is not necessary to consider the degree of meshing between the gears when fixing the housing.

  Further, according to the present invention, since the gear including the first gear is provided in the gear chamber and the gear chamber is formed in the housing, all the gears that transmit power to the rotor are arranged at the assembly stage of the rotary damper. . Therefore, according to the present invention, it is easy to dispose each gear at an accurate position, and as a result, it is possible to make it difficult to cause a meshing failure between the gears.

  Furthermore, since each gear is provided in a gear chamber, the present invention can effectively prevent deterioration of the lubricant applied to each gear and adhesion of foreign matters to each gear. Therefore, according to the present invention, durability can be improved.

FIG. 1 is a plan view showing an embodiment of the present invention. FIG. 2 is a front view showing an embodiment of the present invention. FIG. 3 is a bottom view showing an embodiment of the present invention. FIG. 4 is a sectional view of the housing employed in the embodiment of the present invention. 5 is a cross-sectional view taken along the line AA in FIG. 6 is a cross-sectional view taken along the line BB in FIG. FIG. 7 is a bottom view showing a state in which the second lid is removed from the embodiment of the present invention. FIG. 8 is a plan view of the second lid employed in the embodiment of the present invention. FIG. 9 is a cross-sectional view showing another embodiment of the braking mechanism.

  The rotary damper according to the present invention includes a transmission mechanism for transmitting power for rotating the rotor, in addition to a braking mechanism for reducing the rotational speed of the object to be controlled.

  The braking mechanism includes a working chamber formed in the housing, a rotor provided in the working chamber, and a medium that provides resistance to rotation of the rotor. According to such a configuration, the rotational force of the rotor is attenuated by utilizing the resistance of the medium.

  The transmission mechanism includes a gear chamber formed in the housing and two or more gears provided in the gear chamber and transmitting power to the rotor. The power for rotating the rotor is generated by the rotational movement of the controlled object. The generated power is transmitted to the axis of the control object that rotates together with the control object. Therefore, the transmission mechanism requires at least two gears, that is, a gear connected to the shaft of the object to be controlled and a gear connected to the rotor, but transmits power to the rotor by combining three or more gears. It is good also as a structure. In the present invention, the first gear connected to the shaft of the control object is included in two or more gears provided in the gear chamber.

  A typical example of the control object is an object that rotates, but an object that linearly moves can also be included in the control object by providing a configuration that changes the direction of movement.

  The axis of the control object is an axis that rotates together with the control object. This shaft may be configured as a part of the control object, or may be connected to the control object.

  Hereinafter, the embodiment of the present invention will be described more specifically based on examples of the present invention, but the technical scope of the present invention is not limited to the contents of the following description.

  A rotary damper according to an embodiment of the present invention includes a housing 10, a working chamber 11, a rotor 12, a medium 13, a gear chamber 14, a first gear 15, and a second gear 16.

  The housing 10 includes a housing body 10a, a first lid 10b, and a second lid 10c (see FIGS. 1 to 4).

  The first lid 10b is a lid attached to the housing body 10a in order to close the working chamber 11 (see FIG. 4).

  The second lid 10c is a lid attached to the housing body 10a in order to close the gear chamber 14 (see FIG. 4).

  The working chamber 11 is formed inside the housing 10 (see FIGS. 4 and 5). As shown in FIG. 4, the working chamber 11 is a space surrounded by the first lid 10b, the peripheral wall 10d, and the bottom wall 10e.

  The peripheral wall 10d is a part of the housing body 10a (see FIG. 4). As shown in FIG. 6, the peripheral wall 10 d has an inner peripheral surface whose cross-sectional shape is an arc.

  The bottom wall 10e is provided so as to partition the working chamber 11 and the gear chamber 14 (see FIGS. 4 and 5). Similarly to the peripheral wall 10d, the bottom wall 10e is formed as a part of the housing body 10a (see FIGS. 4 and 5).

  The rotor 12 is provided in the working chamber 11 (see FIG. 5). As shown in FIG. 6, the rotor 12 employed in the embodiment includes a rotating shaft 12 a and a vane 12 b.

  One end of the rotating shaft 12a is formed in the first lid 10b, and is inserted into and supported by a hole 10f that functions as a bearing (see FIGS. 4 and 5). The other end of the rotating shaft 12a is formed in the bottom wall 10e, and is inserted into and supported by a hole 10g that functions as a bearing (see FIGS. 4 and 5).

  The vane 12b is formed in a plate shape and is provided so as to rotate together with the rotating shaft 12a (see FIG. 6).

  A space formed between the rotating shaft 12a and the peripheral wall 10d is partitioned by a partition wall 10h (see FIG. 6). In the embodiment, two partition walls 10h are provided at positions facing each other, but a configuration in which one or three or more partition walls 10h are provided may be employed.

  The medium 13 provides resistance to the rotation of the rotor 12. In the embodiment, oil is used as the medium 13. As shown in FIG. 6, the medium 13 is filled in the working chamber 11 (a space partitioned by the partition wall 10h) (see FIG. 6).

  In order to prevent leakage of the medium 13, seals 17a, 17b, between the rotary shaft 12a and the first lid 10b, between the first lid 10b and the peripheral wall 10d, and between the rotary shaft 12a and the bottom wall 10e, 17c is disposed (see FIG. 5).

  The braking mechanism including the working chamber 11, the rotor 12 and the medium 13 described above attenuates the rotational force of the rotor 12 using the pressure resistance of the medium 13 generated when the rotor 12 is rotated. is there. That is, when the rotating shaft 12a is rotated, the vane 12b rotates together with the rotating shaft 12a to pressurize the medium 13 (see FIG. 6). As a result, the pressure of the medium 13 increases, and this pressure acts as a resistance against the rotation of the rotor 12 and acts on the vane 12b. As a result, the rotational force of the rotor 12 is attenuated.

  As another embodiment of the braking mechanism, a configuration in which the rotational force of the rotor 12 is attenuated using the viscous resistance of the medium 13 generated when the rotor 12 is rotated may be employed. For example, as shown in FIG. 9, the cylindrical rotor 12 is provided in the working chamber 11, and the medium 13 is filled between the rotor 12 and the peripheral wall 10d. In such a configuration, it is preferable to use grease as the medium 13. According to such a configuration, when the rotor 12 is rotated, the viscous resistance of the medium 13 acts on the rotor 12 and the rotational force of the rotor 12 is attenuated.

  The gear chamber 14 is formed inside the housing 10 (see FIGS. 4 and 5). In the embodiment, the internal space of the housing 10 excluding the working chamber 11 functions as the gear chamber 14.

  The first gear 15 and the second gear 16 are gears for transmitting power to the rotor 12. The first gear 15 and the second gear 16 are provided in the gear chamber 14 (see FIGS. 5 and 7).

  The first gear 15 is a gear connected to a shaft (not shown) of the controlled object. The first gear 15 has a central shaft 15a (see FIG. 5).

  The central shaft 15a has a hole 15b that is coupled to the shaft of the controlled object (see FIG. 5). The central shaft 15a is inserted into and supported by a hole 10k formed in the housing 10 (see FIGS. 4 and 5). It is preferable that the center shaft 15a is inserted deeply into the hole 10k to the extent that no eccentricity occurs even when a load is applied so that the first gear 15 is stably supported.

  The second gear 16 is a gear connected to the rotor 12. The second gear 16 has a central shaft 16a (see FIG. 5).

  The central shaft 16a is inserted into and supported by a hole 12c formed in the rotor 12 (see FIG. 5). It is preferable that the center shaft 16a is inserted into the hole 12c so deeply that no eccentricity occurs even when a load is applied so that the second gear 16 is stably supported.

  The central shaft 16a is coupled to the hole 12c so that the rotor 12 and the second gear 16 can rotate together.

  When the first gear 15 and the second gear 16 are arranged in the gear chamber 14, the positional relationship between the hole 15b and the hole 12c is parallel (see FIG. 5). The first gear 15 and the second gear 16 are engaged with each other (see FIG. 7). The gear ratio of the first gear 15 and the second gear 16 is 1: 1, but is not limited thereto.

  In the embodiment, all the gears (the first gear 15 and the second gear 16) that transmit power to the rotor 12 can be arranged in the assembly stage of the rotary damper. Therefore, it is easy to dispose the first gear 15 and the second gear 16 at accurate positions, respectively, and as a result, it is possible to make it difficult for the first gear 15 and the second gear 16 to be misaligned.

  The second lid 10 c preferably has a support portion that supports the first gear 15 and / or the second gear 16. As shown in FIGS. 4 and 8, the second lid 10c employed in the embodiment is a hole 10m through which the shaft of the control object is inserted, and an annular protrusion formed around the hole 10m. The first support portion 10n and the second support portion 10p made of a circular protrusion are configured.

  The first support portion 10n fits into an annular groove 15c formed in the first gear 15 and plays a role of supporting the first gear 15 (see FIGS. 5 and 7). Since the center shaft 15a is supported by the hole 10k and the opposite side of the center shaft 15a is supported by the first support portion 10n, the first gear 15 can be rotated in a more stable state.

  The second support part 10p fits into a circular groove 16b formed in the second gear 16 and plays a role of supporting the second gear 16 (see FIGS. 5 and 7). Since the center shaft 16a is supported by the hole 12c and the opposite side of the center shaft 16a is supported by the second support portion 10p, the second gear 16 can be rotated in a more stable state.

  In the embodiment, the first gear 15 and the second gear 16 are meshed as described above. In such a configuration, as described above, the support structure of the first gear 15 and the second gear 16 is used as both-side support, and the stability of the first gear 15 and the second gear 16 is improved by engaging the gears. Contributes to making it better. Therefore, according to such a structure, it becomes possible to make it difficult to cause a problem of meshing between gears.

  In the embodiment, since all the gears (the first gear 15 and the second gear 16) that transmit power to the rotor 12 are provided in the gear chamber 14 as described above, the lubricant applied to each gear. It is possible to effectively prevent the deterioration and the adhesion of foreign matters to each gear. Therefore, durability can be improved.

  The gear chamber 14 preferably has airtightness. In the embodiment, seals 17d and 17e are disposed between the first support portion 10n and the first gear 15 and between the second lid 10c and the housing body 10a in order to maintain the airtightness of the gear chamber 14. (See FIG. 5). According to such a configuration, since communication with the outside air can be blocked and foreign matter can be prevented from entering from the outside, it is possible to prevent deterioration of the lubricant applied to each gear and adhesion of foreign matter to each gear. It becomes possible to prevent more effectively over a period. The seals 17d and 17e are useful for preventing leakage of the lubricant.

  The rotary damper configured as described above is used with the housing 10 fixed. The embodiment includes an arm 10r used for fixing the housing 10 (see FIGS. 1 to 3 and 7). The arm 10r is formed integrally with the housing body 10a and has a hole 10s through which a fixing bolt is inserted at the tip (see FIGS. 1 to 3 and 7).

  When the rotary damper is attached, the fixed position of the housing 10 is determined by only connecting the first gear 15 to the shaft of the object to be controlled without causing any trouble in the engagement of the first gear 15 and the second gear 16. Is done. Therefore, when the housing 10 is fixed, it is not necessary to consider how the first gear 15 and the second gear 16 are engaged.

  The shaft of the control object is inserted into a hole 15b formed in the central shaft 15a of the first gear 15, and the shaft and the first gear 15 are coupled so as to rotate together. As a result, the end of the shaft of the controlled object is supported by the housing body 10a via the central shaft 15a of the first gear 15, so that the vibration of the controlled object shaft is suppressed, and the first gear 15 can be rotated in a stable state.

  For example, when the control object is a tailgate provided at the rear end of the truck bed, a shaft (control object axis) that rotates together with the tailgate is formed on the central axis 15 a of the first gear 15. The shaft 15 and the first gear 15 are coupled so as to rotate together. When the tailgate rotates in the opening direction, the first gear 15 rotates together with the shaft, and the second gear 16 and the rotor 12 rotate in conjunction therewith. At this time, since the rotational force of the rotor 12 is attenuated by the resistance of the medium 13, the rotational speed of the tailgate is also reduced. As a result, the tailgate opens at a slow rate.

10 housing 10a housing body 10b first lid 10c second lid 10d peripheral wall 10e bottom wall 10f, 10g hole 10h partition 10k, 10m hole 10n first support portion 10p second support portion 10r arm 10s hole 11 working chamber 12 rotor 12a Rotating shaft 12b Vane 12c Hole 13 Medium 14 Gear chamber 15 First gear 15a First gear 15a Center shaft 15b Hole 15c Groove 16 Second gear 16a Second gear central shaft 16b Groove 17a, 17b, 17c, 17d, 17e Seal

Claims (7)

  A rotary damper comprising a working chamber formed in a housing, a rotor provided in the working chamber, and a medium that provides resistance to rotation of the rotor, the gear chamber formed in the housing, and the gear A rotary damper, further comprising two or more gears provided in the chamber and transmitting power to the rotor, wherein the gears include a first gear coupled to a shaft of a controlled object.   The rotary damper according to claim 1, wherein the first gear has a central axis, and the central axis is inserted into and supported by a hole formed in the housing.   The rotary damper according to claim 2, wherein the axis of the control object is inserted into and supported by a hole formed in the central axis.   The rotary damper according to claim 2, wherein the housing includes a lid that closes the gear chamber, and the lid includes a support portion that supports the first gear.   The gear includes a second gear coupled to the rotor, the second gear has a central axis, and the central axis is inserted into and supported by a hole formed in the rotor. The rotary damper according to claim 1.   The rotary damper according to claim 5, wherein the housing includes a lid that closes the gear chamber, and the lid includes a support portion that supports the second gear.   The rotary damper according to claim 1, wherein the gear chamber has airtightness.

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