JP4166986B2 - Rotating damper and assist grip device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary damper that applies a damping force to a member that rotates by an elastic member, and an assist grip device that uses the rotary damper.
[0002]
[Prior art]
FIG. 13 is an explanatory view showing an example of a conventional rotary damper. Here, the rotary damper has a pair of first cams 2 and 2 fixed to the shaft 1 with an engagement surface facing each other and fixed at a predetermined interval, and the first cam 2 It is composed of a pair of second cams 3 and 3 which are respectively engaged with the inclined surface 3a and urged outward by the elastic member 4.
[0003]
In the rotary damper having such a configuration, the second cam 3 is non-rotatable by a fixing means (not shown) and is supported so as to be slidable in the axial direction. The second cams 3 and 3 approach each other against the spring force of the elastic member 4 by the action of the inclined surface. This spring force can limit the rotation of the shaft 1.
[0004]
[Problems to be solved by the invention]
However, the conventional rotary damper having the above-described configuration has a large number of parts and individual components are not unitized. Therefore, workability when assembling is poor and a large space is required. Further, there has been a risk of misassembly or torque transmission failure due to deviation in the rotational direction during assembly.
[0005]
The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a rotary damper that is compactly housed in one case and has excellent assemblability.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is provided with a cam member provided with a locking piece erected from an arcuate side wall formed of a part of a cylindrical body , and the cam member attached in a predetermined direction. an elastic member for energizing a bottomed having a small tube portion for inserting the elastic member and the notches for engaging the locking piece with housing the cam member and the elastic member with the locking piece inside A rotary damper having a storage case, wherein the cam member is supported so as to be movable only in the axial direction of the storage case when stored in the storage case .
[0007]
According to a second aspect of the present invention, the cam member has a cam surface formed on a side end surface thereof, and is biased in a direction in which the cam surface protrudes by the elastic member.
[0008]
According to a third aspect of the present invention, the cam member is stored in the storage case in a non-rotatable manner.
[0009]
According to a fourth aspect of the present invention, the cam member and the storage case have a shaft insertion hole.
[0010]
Further, in the invention according to claim 5, a rotary damper comprising a cam member, an elastic member that urges the cam member in a predetermined direction, and storage cases opened at both ends for storing the cam member and the elastic member. The cam member is supported at both ends of the storage case so as to be movable only in the axial direction.
[0011]
Further, in the invention according to claim 6, there is provided an assist grip device for urging an assist grip rotatably supported to a return position, wherein a cam member is provided in a support recess of the assist grip, and the cam member is provided in a predetermined manner. An elastic member that biases in the direction, and a storage case that stores the cam member and the elastic member. The cam member is supported so as to be movable only in the axial direction of the storage case, and the extracted assist grip is It is characterized by having a rotary damper that urges in the return direction.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. FIG. 1 is a longitudinal sectional view showing a rotary damper according to the present invention, and FIG. 2 is an exploded perspective view of the rotary damper according to the present invention.
[0013]
Here, the rotary damper 10 includes a cam member 11, an elastic member (coil spring) 12 that urges the cam member 11 in a predetermined direction, and a bottomed storage case 13 that stores the cam member 11 and the elastic member 12. The cam member 11 is supported so as to be movable only in the axial direction of the storage case 13.
[0014]
In FIG. 1, the cam member 11 is substantially cylindrical and has a helical cam surface 11a on the upper surface. The cam surface 11a is low at point A and is at the highest position at point B (see FIG. 10). An insertion hole 11b for inserting a shaft is formed at the center of the cam surface 11a. Further, a locking piece 11 c is formed on the side wall of the cam member 11. The locking piece 11c is formed by cutting out three directions, and has an engaging protrusion 11d protruding in the outer peripheral direction. In the present embodiment, the locking pieces 11c are disposed at opposing positions. Moreover, the side wall has the notch part 11e.
[0015]
The elastic member 12 is composed of a compression coil spring in the present embodiment, and has a larger winding diameter than the insertion hole 11 b of the cam member 11. The storage case 13 has a bottomed cylindrical shape, and a protrusion 14 for preventing rotation is formed on the side wall. The protrusion 14 extends in the longitudinal direction of the storage case 13. The inner diameter of the storage case 13 is set to a dimension that allows the cam member 11 to be inserted. Further, the storage case 13 has a notch portion 15 that can be engaged with a locking piece 11 c formed on the cam member 11 on the side wall. In addition, the storage case 13 has a small tube portion 16 rising from the bottom wall 13a at the center. The outer diameter of the small tube portion 16 is smaller than the insertion hole 11b of the cam member 11, and can be inserted therethrough.
[0016]
Next, assembly of each member configured as described above will be described. First, the coil spring 12 is inserted from the upper surface opened to the small tube portion 16 of the storage case 13. Next, the cam member 11 is inserted so that the position of the locking piece 11c formed on the side wall coincides with the position of the notch 15. The engaging protrusion 11 formed on the locking piece 11c contacts the inner peripheral surface of the storage case 13 at the time of insertion, so that the engaging protrusion 11 is temporarily retracted. Projecting from the portion 15 in the outer circumferential direction. Due to this protrusion, the cam member 11 is prevented from being detached from the storage case 13. Further, when the cam member 11 is inserted, the coil spring 12 is compressed, and an urging force that pushes upward is applied. Furthermore, since the vertical dimension of the cam member 11 is shorter than the vertical dimension of the storage case 13, the cam member 11 can be pushed further.
[0017]
Next, the operation of the rotary damper 10 according to the present invention configured as described above will be described. First, in the rotary damper 10 attached so as not to rotate by the protrusion 14, a support shaft (not shown) is inserted into the small tube portion 16. Further, when the rotating member rotatably attached to the support shaft rotates while coming into contact with the cam surface 11a, the cam member 11 moves toward the point B from the point A on the cam surface. Pushed down against. That is, the rotating member that rotates while coming into contact with the cam surface 11a receives a strong pressing force as it rotates and receives a damping force by the elastic member. Further, since the rotary damper is integrally formed compactly, it can be easily assembled.
[0018]
FIG. 3A is a longitudinal sectional view showing another embodiment of the rotary damper of the present invention. In the present embodiment, the rotary damper 20 includes a cam member 21, an elastic member 22 that urges the cam member 21 in a predetermined direction, and storage cases 23 that are open at both ends for storing the cam member 21 and the elastic member 22. The cam member 21 is supported at both ends of the storage case 23 so as to be movable only in the axial direction.
[0019]
Here, the cam member 21 has a substantially cylindrical shape, and has a helical cam surface 21a on the upper surface. As with the first embodiment, the cam surface 21a is low at point A and is at the highest position at point B. An insertion hole 21b for inserting a shaft is formed at the center of the cam surface 21a. Further, a locking piece 21 c is formed on the side wall of the cam member 21. The locking piece 21c is formed by cutting out the three surrounding directions, and has an engaging protrusion 21d protruding in the outer peripheral direction. In the present embodiment, the locking pieces 21 are disposed at opposing positions.
[0020]
The elastic member 22 is composed of a compression coil spring in the present embodiment, and has a larger winding diameter than the insertion hole 21 b of the cam member 21. The storage case 23 has a cylindrical shape with both ends open, and a protrusion (not shown) for preventing rotation is formed on the side wall. The inner diameter of the storage case 23 is set to a dimension that allows the cam member 21 to be inserted. Furthermore, the storage case 23 has a notch 25 on the side wall that can be engaged with a locking piece 21 c formed on the cam member 21. The storage case 23 has a small tube portion 26 in the center, and is fixedly supported by a support arm 23a. The outer diameter of the small cylinder part 26 is formed smaller than the insertion hole 21b of the cam member 21, and can be inserted therethrough.
[0021]
Next, assembly of each member configured as described above will be described. First, the cam member 21 is inserted from one opening of the storage case 23, and the engagement protrusion 21 d is engaged with the notch 25 of the storage case 23. Next, the small cylinder part 26 and the elastic member 22 are stored in the storage case 23 from the other opening. Furthermore, another cam member 21 is inserted. At the time of insertion, by contacting the inner peripheral surface of the storage case 23, it once retracts, but when it reaches the notch 25, it is restored by elastic force and protrudes from the notch 25 in the outer peripheral direction. Due to this protrusion, the cam member 21 is prevented from being detached from the storage case 23. Further, when the cam member 21 is inserted, the coil spring 12 is compressed by the upper and lower cam members 21 to apply an urging force for pushing out in both directions. Furthermore, since the vertical dimension in which two cam members 21 are arranged is shorter than the vertical dimension of the storage case 23, the cam member 21 can be further pushed in.
[0022]
When configured as described above, since the cam members 21 are disposed on both surfaces of the storage case 23, the degree of freedom in attaching to the member to which braking damping is applied can be further increased. Also, there is no risk of incorrect assembly during collection.
[0023]
FIG. 3B is a longitudinal sectional view showing another embodiment of the present invention. This embodiment is substantially the same as the example shown in FIG. 3A, but a guide portion 21f for guiding the end of the spring is formed on the inner surface of the cam member 21 instead of the small tube portion. ing.
[0024]
When configured as described above, the small tube portion for guiding the spring is not necessary, and the number of parts can be reduced.
[0025]
4 is an exploded perspective view showing an assist grip device using the rotary damper of the present invention, FIG. 5 is an enlarged perspective view of a main part showing a base portion of the assist grip of the present invention, and FIG. 6 is an assist grip of the present invention. FIG. 7 is an explanatory view showing a relationship between the assist grip and the rotary damper. Here, the assist grip device 27 urges the assist grip 27a that is rotatably supported to the return position. The cam member 11 and the cam member 11 are placed in the support recess 28 of the assist grip 27a. An elastic member 12 for urging in a predetermined direction; a storage case 13 for storing the cam member 11 and the elastic member 12; and the cam member 11 is supported so as to be movable only in the axial direction of the storage case 13. A rotating damper is provided to urge the pulled-out assist grip 27a in the return direction.
[0026]
The assist grip 27 a has a fixing groove 29 in the support recess 28, and the protrusion 14 formed on the outer peripheral surface of the rotary damper 10 is engaged with the fixing groove 29, so that the storage case 13 is engaged with the assist grip 27 a. And rotate together. As shown in FIGS. 5 and 6, the base 30 fixed to the vehicle body side has a shaft hole 30a through which a support shaft for supporting the rotary damper 10 is inserted, and a protrusion 30b around the shaft hole 30a. Is formed.
[0027]
As shown in FIGS. 4 and 6, the rotary damper 10 is placed between the arms 30 d of the base 30, and is disposed so that the cam surface 11 a contacts the protrusion 30 b of the base 30. The base 30 is fixed to the vehicle body by the base end portion 30c. Here, FIG. 8 is an explanatory view showing a state of the rotary damper when the assist grip is not used, FIG. 9 is an explanatory view showing a state of the rotary damper when the assist grip is used, and FIG. 10 is a development view of the cam member, FIG. 11 is an X direction arrow view showing the state of the rotary damper when the assist grip is not used, and FIG. 12 is a Y direction arrow view showing the state of the rotary damper when the assist grip is used.
[0028]
In the state shown in FIG. 8, the assist grip 27a is in an unused state, and the protrusion 30b formed on the arm 30d of the base 30 is at the lowest position A of the cam surface 11a. This corresponds to FIG. In this state, the assist grip 27a receives almost no urging force from the cam surface 11a.
[0029]
Next, when the assist grip 27a is sequentially pulled out, the rotary damper 10 rotates together with the assist grip, the base protrusion 30b comes into contact with a high position of the cam surface, and gradually receives a strong biasing force. The state shown in FIG. 9 is a state where the protrusion 30b of the base is in contact with the highest position of the cam surface. The assist grip 27a is in the most opened state and corresponds to FIG. The assist grip 27a opens at an angle of about 120 to 130 °. When the hand is released from the assist grip in this state, the original position is restored by the urging force of the rotary damper 10.
[0030]
The assist grip device configured as described above can apply a damping force by a spring to an assist grip in an automobile. That is, it is possible to achieve a reduction in manufacturing cost and an improvement in workability due to the reduction in the number of parts.
[0031]
In the above embodiment, the example in which the rotary damper is used in an assist grip device in an automobile has been described. However, the present invention is not limited to this and can be used as a damper for a member that performs other opening / closing movements.
[0032]
【The invention's effect】
Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.
[0033]
According to the first aspect of the present invention, a cam member having a locking piece standing from an arcuate side wall formed of a part of a cylindrical body, an elastic member for urging the cam member in a predetermined direction, and the engagement rotary damper having a bottomed housing case having a small tube portion for inserting the elastic member and the notches for engaging the locking piece with housing the cam member and the elastic member having a stop piece therein The cam member is supported so as to be movable only in the axial direction of the storage case when stored in the storage case .
[0034]
With this configuration, the cam surface is pressed as the rotating member rotates, and a damping force can be obtained by the repulsive force from the elastic member.
[0035]
Further, in the invention according to claim 2, since the cam member has a cam surface formed on a side end surface and is biased in a direction in which the cam surface protrudes by the elastic member, the rotational movement of the rotating member is elastic. It can be converted into a linear motion that contracts the member.
[0036]
In the invention according to claim 3, since the cam member is housed in the housing case so as not to rotate, the rotational motion of the rotating member can be converted into a linear motion that causes the elastic member to contract.
[0037]
In the invention according to claim 4, since the cam member and the storage case have a shaft insertion hole, the support shaft can be inserted into the shaft insertion hole for use.
[0038]
Further, in the invention according to claim 5, a rotary damper comprising a cam member, an elastic member that urges the cam member in a predetermined direction, and storage cases opened at both ends for storing the cam member and the elastic member. And since the said cam member was supported by the both ends of the said storage case so that the movement only to an axial direction was respectively possible, the stronger damping force accompanying rotation of a rotation member can be obtained.
[0039]
Further, in the invention according to claim 6, there is provided an assist grip device for urging an assist grip rotatably supported to a return position, wherein a cam member is provided in a support recess of the assist grip, and the cam member is provided in a predetermined manner. An elastic member that biases in the direction, and a storage case that stores the cam member and the elastic member. The cam member is supported so as to be movable only in the axial direction of the storage case, and the extracted assist grip is Since the rotary damper for urging in the return direction is provided, it is possible to realize a reduction in the number of parts and a significant reduction in the number of assembly steps. In addition, since the structure is integrated and compact, there is no possibility that the member is displaced in the rotational direction during the assembly, and that inconvenience such as torque transmission failure occurs.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a rotary damper according to the present invention.
FIG. 2 is an exploded perspective view of the rotary damper.
FIG. 3 (a) is a longitudinal sectional view showing another embodiment of the rotary damper of the present invention, and FIG. 3 (b) is a longitudinal sectional view showing another embodiment.
FIG. 4 is an exploded perspective view showing an assist grip device using the rotary damper of the present invention.
FIG. 5 is an enlarged perspective view of a main part showing a base part of the assist grip.
FIG. 6 is an explanatory view of a rotary damper showing a state where it is attached to the assist grip.
FIG. 7 is an explanatory diagram showing a relationship between the assist grip and the rotary damper.
FIG. 8 is an explanatory diagram showing a state of the rotary damper when the assist grip is not used.
FIG. 9 is an explanatory diagram showing a state of the rotary damper when the assist grip is used.
FIG. 10 is a development view of the cam member.
FIG. 11 is an X direction arrow view showing a state of the rotary damper when the assist grip is not used;
FIG. 12 is a view in the Y direction showing the state of the rotary damper when the assist grip is used.
FIG. 13 is an explanatory view showing an example of a conventional rotary damper.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rotation damper 11 Cam member 11a Cam surface 11b Insertion hole 11c Locking piece 11d Engaging protrusion 11e Notch 12 Elastic member (coil spring)
13 Storage case 13a Bottom wall 14 Protrusion 15 Notch 16 Small tube 20 Rotation damper 21 Cam member 21a Cam surface 21b Insertion hole 21c Locking piece 21d Engagement protrusion 21f Guide portion 22 Elastic member 23 Storage case 23a Support arm 25 Notch Notch portion 26 Small tube portion 27 Assist grip device 27a Assist grip 28 Support recess 29 Fixing groove 30 Base 30a Shaft hole 30b Protrusion 30c Base end portion 30d Arm

Claims (6)

A cam member provided with a locking piece erected from an arc-shaped side wall formed of a part of a cylindrical body ;
An elastic member for urging the cam member in a predetermined direction;
And a bottom housing case having a small tube portion for inserting the elastic member and the notches for engaging the locking piece with housing the cam member and the elastic member with the locking piece inside A rotary damper,
When the cam member is stored in the storage case, the cam member is supported so as to be movable only in the axial direction of the storage case .   2. The rotary damper according to claim 1, wherein a cam surface is formed on a side end surface of the cam member, and the cam member is biased in a direction in which the cam surface protrudes by the elastic member.   The rotary damper according to claim 1, wherein the cam member is stored in the storage case so as not to rotate.   The rotary damper according to claim 1, wherein the cam member and the storage case have a shaft insertion hole.   A rotary damper comprising a cam member, an elastic member that urges the cam member in a predetermined direction, and storage cases that are open at both ends that store the cam member and the elastic member, wherein the cam member includes the storage member A rotary damper characterized in that it is supported at both ends of the case so as to be movable only in the axial direction.   An assist grip device that urges a pivotally supported assist grip to a return position, a cam member in a support recess of the assist grip, an elastic member that urges the cam member in a predetermined direction, and the cam A storage case for storing a member and an elastic member, wherein the cam member is supported so as to be movable only in the axial direction of the storage case, and includes a rotary damper that biases the extracted assist grip in a return direction. An assist grip device characterized by that.

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