CN113853470A

CN113853470A - Damper device

Info

Publication number: CN113853470A
Application number: CN202080036664.7A
Authority: CN
Inventors: 斋藤淳
Original assignee: Piolax Inc
Current assignee: Piolax Inc
Priority date: 2019-05-28
Filing date: 2020-05-22
Publication date: 2021-12-28
Anticipated expiration: 2040-05-22
Also published as: JPWO2020241518A1; WO2020241518A1; CN113853470B; JP7133709B2

Abstract

The invention provides a damper device, which has good brake force responsiveness when the moving direction of a rack body is reversed. A damper device (100) is provided with: a rack body (160) having a rack (170); a rotary damper (110) having a pinion gear (120) engaged with the rack gear; and a case (130) that holds the rack body slidably and accommodates the rotary damper rotatably, the rotary damper including: a rotor (111) coupled to the pinion gear; and a gear housing (115) that surrounds the rotor with a viscous fluid interposed therebetween, is attached so as to be relatively rotatable with respect to the rotor, and has a large-diameter gear (116) on an outer periphery thereof, the case having: an accommodating part (140) for accommodating a planetary gear (150) engaged with the large-diameter gear of the rotary damper so that the planetary gear can move a predetermined distance in the circumferential direction of the large-diameter gear; an engaging portion (141) provided on one side of an inner wall of the housing portion, the engaging portion limiting rotation of the planetary gear when the planetary gear abuts against the engaging portion; and a rotation allowing portion (142) provided on the other side opposite to the one side of the inner wall of the housing portion, the rotation allowing portion allowing the planetary gear to rotate in a state where the planetary gear is in contact with the rotation allowing portion.

Description

Damper device

Technical Field

The present invention relates to a damper device, which is applied to a glove box (glove box) of a vehicle, for example, and which performs a damper action at a predetermined operation such as when the glove box is opened.

Background

For example, in an opening/closing body such as a glove box of a vehicle, a damper device may be provided to suppress abrupt opening of the opening/closing body. Various mechanisms are known for such a damper device, and one of them is known to use a rotary damper. The damper device using the rotary damper has an advantage that the device can be easily miniaturized.

As a damper device using a rotary damper, patent document 1 below discloses a damper device including: a first member; a second member rotatably or relatively rotatably combined with the first member; and a viscous fluid filled between the two members, the damper device being configured to apply a braking force to the rotation by the viscous fluid, and including: a rotary damper body having a pinion gear portion on one of the first member and the second member; and a protrusion facing the recess of the other of the first member and the second member provided in the rotary damper body, wherein the damper device includes a support body that rotatably supports the rotary damper body while accommodating the protrusion in the recess, and wherein an engagement portion is formed in the recess and the protrusion, and wherein the engagement portion is engaged with each other by the rotary damper body moving in the same direction as the rack body when the rotary damper body moves in one direction or moves relatively to the rack body combined with the pinion portion, and the engagement portion is disengaged by the rotary damper body moving in the same direction as the rack body when the rotary damper body moves in the other direction or moves relatively to the rack body.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5836281

Disclosure of Invention

Problems to be solved by the invention

However, in the damper device of patent document 1, since the rotary damper body itself is moved relative to the support body in accordance with the movement of the rack gear body, and the engagement and disengagement between the recess and the projection are performed, there are problems as follows: when the direction of movement of the rack body is reversed, it is difficult to smoothly switch from the engagement released state to the engagement state, and the braking force responsiveness is poor.

Therefore, an object of the present invention is to provide a damper device having excellent braking force responsiveness when the movement direction of the rack gear body is reversed.

Means for solving the problems

The damper device according to the present invention for achieving the above object is characterized by comprising:

a rack body having a rack formed in a length direction; a rotary damper having a pinion gear engaged with the rack gear and a large-diameter gear provided on an outer periphery thereof; a planetary gear configured to mesh with the large diameter gear; and a case holding the rack body slidably and accommodating the rotary damper and the planetary gear rotatably,

the rotary damper has: a rotor coupled to the pinion gear; and a gear housing that surrounds the rotor via a viscous fluid, is attached so as to be relatively rotatable with respect to the rotor, and has the large-diameter gear on an outer periphery thereof,

the box body is provided with: an accommodating portion that accommodates the planetary gear so that the planetary gear can move a predetermined distance in a circumferential direction of the large-diameter gear in a state of being meshed with the large-diameter gear of the rotation damper; an engaging portion provided on one side of an inner wall of the accommodating portion, the engaging portion limiting rotation of the planetary gear when the planetary gear abuts against the engaging portion; and a rotation allowing portion provided on the other side opposite to the one side of the inner wall of the housing portion, the rotation allowing portion allowing the planetary gear to rotate in a state where the planetary gear abuts against the rotation allowing portion,

the damper device is configured to: when the rack body moves in a predetermined direction, the planetary gear moves to one side of the housing portion in accordance with the rotation of the gear housing and is engaged with the engagement portion to be restricted from rotating, and when the rack body moves to the opposite side, the planetary gear moves to the other side of the housing portion in accordance with the rotation of the gear housing and is allowed to rotate by coming into contact with the rotation allowing portion.

Effects of the invention

According to the present invention, when the rack body moves in the predetermined direction, the planetary gear moves to one side of the housing portion in accordance with the rotation of the gear housing and engages with the engagement portion to restrict the rotation, and therefore the rotation of the gear housing is stopped via the planetary gear, and the rotor rotates relative to the gear housing, thereby applying a braking force to the rotation of the rotor via the viscous fluid and applying a braking force to the movement of the rack body.

Further, when the rack body moves to the opposite side, the planetary gear moves to the other side of the housing portion in accordance with the rotation of the gear housing and is allowed to rotate by coming into contact with the rotation allowing portion, so that the gear housing rotates in accordance with the rotation of the rotor, the braking force on the rotation of the rotor is released, and the braking force on the movement of the rack body is released.

Further, since the rotation restriction of the gear housing and the release of the rotation restriction are achieved by the movement of the planetary gear in the housing portion, the switching operation can be smoothly performed, and the braking force responsiveness when the movement direction of the rack body is reversed can be improved.

Drawings

Fig. 1 is an exploded perspective view showing one embodiment of a damper device of the present invention.

Fig. 2 is a perspective view of an assembled state of the damper device.

Fig. 3 is an exploded perspective view of a rotary damper in the damper device.

Fig. 4 is a sectional view taken along the width direction of the rack body of the damper device.

Fig. 5 is a sectional view taken along a longitudinal direction of a rack body of the damper device.

Fig. 6 is a perspective view of the rack body of the damper device viewed from the inner surface side.

Fig. 7 is an explanatory diagram showing a sliding operation of the rack gear body of the damper device.

Fig. 8 is an explanatory diagram showing a state when a braking force is applied to the damper device.

Fig. 9 is an explanatory diagram showing a state when the braking force of the damper device is released.

Fig. 10 is an explanatory diagram showing a state in which the braking force for releasing the position where the planetary gear is arranged is changed in the damper device.

Fig. 11 is an explanatory diagram showing a state in which the braking force applied to the position where the planetary gear is disposed is changed in the damper device.

Fig. 12 is a perspective view showing another embodiment of the damper device of the present invention, in which a rotary damper is incorporated in a housing.

Fig. 13 is a sectional view of the damper device.

Fig. 14 is an exploded perspective view showing a damper device according to still another embodiment of the present invention.

Fig. 15 is a perspective view showing a meshing state of a large-diameter gear and a planetary gear of the rotary damper of the damper device.

Fig. 16 is a perspective view of the damper device in a state where the rotary damper and the planetary gear are accommodated in the housing.

Fig. 17 is an exploded perspective view showing a damper device according to still another embodiment of the present invention.

Fig. 18 is a perspective view showing a meshing state of a large-diameter gear and a planetary gear of the rotary damper of the damper device.

Fig. 19 is a perspective view of the damper device in a state where the rotary damper and the planetary gear are accommodated in the housing.

Fig. 20 is a plan sectional view showing still another embodiment of the damper device of the present invention.

Fig. 21 is a side sectional view of the damper device.

Fig. 22 is a sectional view showing still another embodiment of the damper device of the present invention.

Detailed Description

Embodiments of the damper device according to the present invention will be described below with reference to the drawings. Fig. 1 to 11 show one embodiment of the damper device of the present invention.

As shown in fig. 1 and 2, the damper device 100 includes: a rotary damper 110; a case 130 holding the rotary damper 110 to be rotatable; and a rack body 160 slidably attached to the rotary damper 110 and having a rack 170 (refer to fig. 6) engaged with the pinion gear 120 provided to the rotary damper 110.

Referring to fig. 3, 4, and 5 together, the rotary damper 110 includes: a rotor 111; and a gear housing 115 surrounding the rotor 111 with a viscous fluid therebetween and applying a braking force to the rotation of the rotor 111. The gear housing 115 has a recess 117 for accommodating the rotor 111 on its inner side, and has: a large-diameter gear 116 formed with a gear; and a lid 118 that seals an opening of the recess 117 of the large-diameter gear 116. A shaft insertion hole 119 through which the support shaft 112 provided in the rotor 111 is inserted is formed in the center of the cover 118. Further, an annular groove 123 is formed in the lower surface of the large-diameter gear 116, and the annular groove 123 is fitted into an arcuate rib 132 provided in a bottom wall 131 of a housing 130 (described later) to rotatably support the rotary damper 110 (see fig. 5).

The rotor 111 has a disk shape as a whole, and a support shaft 112 is provided to protrude from a central portion of one surface thereof, and the support shaft 112 is inserted through a shaft insertion hole 119 of the cover 118 via a seal ring 113 to protrude outside the gear housing 115. The pinion gear 120 is formed as: the support shaft 112 is inserted and fixed into a shaft hole 122 formed in the center of the gear portion 121, and the support shaft 112 and the pinion gear 120 rotate integrally.

Therefore, if the pinion gear 120 rotates in a state where the rotation of the large diameter gear 116 is restricted, the following are formed: since the rotor 111 rotates relative to the gear housing 115 via the support shaft 11, a braking force is applied to the rotation of the rotor 111 via the viscous fluid.

Referring to fig. 1, 2, 4, and 5 together, the case 130 includes: a bottom wall 131; a pair of side walls 134 erected from both sides of the bottom wall 131; and a front wall 139 that is provided to rise from the bottom wall 131 so as to connect one end of the pair of side walls 134 to each other, and an opposite side to the front wall 139 serves as an insertion opening 138 into which the rotary damper 110 is inserted. Further, the following is formed: an arc-shaped rib 132 is formed on the inner surface of the bottom wall 131, and the arc-shaped rib 132 is fitted into an annular groove 123 (see fig. 5) formed on the bottom surface of the large-diameter gear 116 of the rotary damper 110 to rotatably support the large-diameter gear 116.

Further, a hook 133 is provided on the outer surface (lower surface) side of the bottom wall 131, and the hook 133 is used to attach a member that functions as a damper. For example, when the utility model is applied to a glove box, the utility model is formed as follows: the hook 133 is attached to a side wall of a main body portion provided on the vehicle body side, and a bracket 165 of a rack body 160 described later is coupled to a side wall of a glove box attached to be openable and closable with respect to the main body portion.

Pressing flanges 135 extend inward from each other at the upper end edges of the pair of side walls 134, and the pressing flanges 135 are formed to cover guide ribs 163 on both sides of a rack body 160 described later, and hold the rack body 160 slidably. Further, elastic pieces 136 are formed at opposing side portions of the pair of pressing flanges 135, respectively, with a slit interposed therebetween, and pressing protrusions 137 that elastically abut against side walls 162 of the rack body 160, which will be described later, are formed at intermediate portions of the elastic pieces 136.

Referring to fig. 8 and 9 together, housing portions 140 for housing planetary gears 150, which will be described later, are formed inside the coupling portions between the pair of side walls 134 and the front wall 139 of the housing 130. The housing 140 is configured to hold the planetary gear 150 so as to be movable a predetermined distance along the outer periphery of the large-diameter gear 116, and a pair of the housing 140 is provided in a line-symmetrical shape with respect to the center line L shown in fig. 8. An engagement portion 141 is provided at one end (an end close to the center line L in fig. 8) of the accommodating portion 140 in the movement direction of the planetary gear 150, and when the gear portion 151 of the planetary gear 150 abuts against the engagement portion 141, the rotation of the planetary gear 150 is regulated. In the present embodiment, the engaging portion 141 is formed by a corner portion capable of engaging with the gear portion 151 of the planetary gear 150. A rotation allowing portion 142 is provided at the other end (end distant from the center line L in fig. 8) of the accommodating portion 140 in the moving direction of the planetary gear 150, and when the planetary gear 150 comes into contact with the rotation allowing portion 142, the planetary gear 150 is allowed to rotate. In the present embodiment, the rotation allowing portion 142 is formed of a concave curved surface having an arc shape in plan view, and the planetary gear 150 can rotate while being in contact with the curved surface.

Referring to fig. 6 and 7 together, the rack body 160 includes: a substrate 161 in the form of an elongated plate; a pair of side walls 162 erected toward the inner surface side of the base plate 161 (the direction toward the rotary damper 110) on both sides in the width direction of the base plate 161; and guide ribs 163 extending outward from the end portions of the side walls 162 in the protruding direction, respectively.

As shown in fig. 4, the rack body 160 is formed such that: when the housing 130 is inserted, the convex portion 114 formed on the protruding end surface of the support shaft 112 abuts on the width direction center portion on the inner surface side (lower surface side) of the base plate 161, and the pressing flange 135 covers the upper surface side of the guide rib 163, and holds the rack body 160 slidably inside the housing 130. At this time, as shown in fig. 7, the pressing projection 137 of the elastic piece 136 provided on the pressing flange 135 elastically abuts against the side wall 162 of the rack body 160, and the rack body 160 is held without rattling in the case 130.

As shown in fig. 6, a rack 170 is formed in the longitudinal direction on the inner surface side of the one side wall 162, and the rack 170 is formed to mesh with the pinion gear 120 attached to the support shaft 112 of the rotary damper 110. Therefore, when the rack body 160 slides relative to the housing 130, the pinion gear 120 engaged with the rack 170 rotates, and the rotor 111 rotates via the support shaft 112.

A pair of brackets 165 extend in parallel from one end of the rack body 160, and a mounting hole 166 is formed in each bracket 165. For example, the following are formed: a mounting shaft protruding from a side wall of the glove box is inserted into the mounting hole 166, and one end of the rack body 160 is mounted to a member to be subjected to braking force, such as the glove box.

Further, stoppers 164 are provided in a protruding manner at portions of the rack body 160 close to one end in the longitudinal direction of the pair of guide ribs 163, and as shown in fig. 7 (b), when the rack body 160 is pulled out from the housing 130, the stopper portions are formed such that: when the ends of the pair of side walls 134 of the box body 130 abut against the stopper 164, further drawing is restricted.

As shown in fig. 5 and 8, the lower surface of the rack body 160 is disposed to overlap a part of the upper end surface of the planetary gear 150, and the planetary gear 150 is formed so as to be prevented from coming off the housing 130. In this way, the planetary gear 150 can be prevented from coming off by using the rack body 160, and therefore, the size can be reduced by a simple structure.

Next, the operation of the damper device 100 having the above-described configuration will be described.

The damper device 100 is attached between a pair of members that are close/apart to apply a braking force. For example, in the case of the glove box, as described above, the hook 133 of the box body 130 is connected to the side wall of the main body provided on the vehicle body side, and the bracket 165 is connected to the side wall of the glove box that opens and closes with respect to the main body via the mounting hole 166. In the state where the glove box is closed, as shown in fig. 7 (a), the configuration is such that: the bracket 165 is located close to the box body 130, and when the rack body 160 is pulled out of the box body 130 and the stopper 164 abuts against the box body 130 when the glove box is pulled out, further pulling-out is restricted. In the present embodiment, the damper device 100 is used to prevent the glove box from being opened abruptly when the glove box is pulled out, that is, in the process of fig. 7 (a) to 7 (b), in order to apply the braking force by the rotary damper 110.

As shown in fig. 8, when the rack body 160 is pulled out in the direction a with respect to the housing 130, the pinion 120 engaged with the rack 170 rotates counterclockwise as shown by an arrow C in the drawing. As a result, the rotor 111 connected to the pinion gear 120 via the support shaft 112 is rotated, and the gear housing 115 in contact with the rotor 111 via the viscous fluid is also rotated in the same direction (see fig. 5). As a result, the large-diameter gear 116 rotates counterclockwise as shown by an arrow C in fig. 8, and the planetary gear 150 meshing with the large-diameter gear 116 moves counterclockwise in the housing 140. In this way, the gear portion 151 of the planetary gear 150 engages with the engagement portion 141 of the housing portion 140, and the rotation of the planetary gear 150 is restricted, so that the rotation of the large diameter gear 116 is stopped, and only the rotor 111 rotates within the gear housing 115. Therefore, a braking force is applied to the rotation of the rotor 111 via the viscous fluid, and acts as a braking force to the movement of the rack body 160 in the arrow a direction. This can suppress the glove box from being opened abruptly.

Next, as shown in fig. 9, when the rack body 160 is pushed into the housing 130 in the direction B, the pinion 120 meshing with the rack 170 rotates clockwise as shown by an arrow D in the drawing. As a result, the rotor 111 connected to the pinion gear 120 via the support shaft 112 is rotated, and the gear housing 115 that is in contact with the rotor 111 via the viscous fluid is also rotated in the same direction (see fig. 5). As a result, the large-diameter gear 116 rotates clockwise as indicated by an arrow D in fig. 9, and the planetary gear 150 meshing with the large-diameter gear 116 moves clockwise in the housing 140. In this way, the gear portion 151 of the planetary gear 150 abuts against the inner wall of the rotation allowing portion 142 of the housing portion 140, and the rotation of the planetary gear 150 is allowed, so that the large diameter gear 116 also rotates together with the rotor 111, and the braking force to the movement of the rack body 160 is released. As a result, the rack body 160 can be pressed into the housing 130 with less resistance, and the glove box can be quickly closed.

In the damper device 100, when the moving direction of the rack gear 160 is reversed, the switching of the braking force is realized by the planetary gear 150 having an outer diameter smaller than the large-diameter gear 116 moving in the housing 140, and therefore the moving distance required for the switching can be shortened, and the responsiveness of the switching of the braking force can be improved.

In the present embodiment, as shown in fig. 8, the case 130 is formed in a line-symmetrical shape with respect to the center line L, and a pair of housing portions 140 are formed at line-symmetrical positions with respect to the center line L. Therefore, by selecting the housing portion 140 into which the planetary gear 150 is inserted, the braking direction of the rack body 160 can be changed.

That is, as shown in fig. 10, when the planetary gear 150 is disposed in the housing 140 on the opposite side to that of fig. 8, when the rack body 160 moves in the arrow a direction, the pinion gear 120 rotates counterclockwise as shown by the arrow C, and the planetary gear 150 is allowed to rotate by coming into contact with the rotation allowing portion 142 of the housing 140, so that the braking force can be prevented from being applied.

Further, as shown in fig. 11, when the planetary gear 150 is disposed in the housing portion 140 on the opposite side to that in fig. 9, when the rack body 160 moves in the direction of arrow B, the pinion gear 120 rotates in the clockwise direction shown by arrow D, the planetary gear 150 engages with the engagement portion 141 of the housing portion 140 to be restricted from rotating, and the rotation of the large diameter gear 116 is restricted, so that a braking force can be applied to the movement of the rack body 160.

Therefore, in the same damper device 100, the braking direction of the rack gear 160 with respect to the housing 130 can be appropriately changed by merely changing the arrangement of the planetary gears 150.

Fig. 12 and 13 show another embodiment of the present invention. In the following description of the embodiment, the same reference numerals are given to substantially the same portions as those of the embodiment shown in fig. 1 to 11, and the description thereof will be omitted.

In the damper device 100a, the structure for preventing the planetary gear 150 from coming off the casing 130 is different from the above-described embodiment. That is, of the large-diameter gear 116 and the cover portion 118 constituting the gear housing 115 of the rotary damper 110, the outer diameter of the cover portion 118 is increased and protrudes outward from the outer diameter of the large-diameter gear 116. On the other hand, the planetary gear 150 has a shorter axial length than the above-described embodiment, and the outer peripheral edge of the protruding lid 118 is disposed so as to be able to contact at least a part of the axial end face of the planetary gear 150, thereby preventing the planetary gear 150 from coming off.

According to the above embodiment, since the planetary gear 150 is prevented from falling off by the lid portion 118 of the gear housing 115, the planetary gear 150 can be prevented from falling off at a position lower than the bottom wall 131 of the case 130, and the planetary gear 150 can be prevented from being inclined.

Fig. 14 to 16 show still another embodiment of the present invention. In this damper device 100b, the shapes of the planetary gear 150a and the large diameter gear 116a are different from those of the embodiment.

That is, in the present embodiment, the gear portion 151 of the planetary gear 150a is formed as a helical gear, and the large-diameter gear 116a is also formed as a helical gear that can mesh with the planetary gear 150 a. The inclination direction of each helical gear is not particularly limited, but is preferably set so that a force that presses the planetary gear 150a against the bottom wall 131 of the case 130 acts when the planetary gear 150a moves to the rotation allowing portion 142 of the housing portion 140 and the helical gear rotates while meshing with the large-diameter gear 116 a. This presses the planetary gear 150a against the bottom wall 131 of the case 130, and the wobbling of the planetary gear 150a can be suppressed.

In FIGS. 17 to 19, still another embodiment of the present invention is shown. In this damper device 100c, the shape of the planetary gear 150b is different from that of the above-described embodiment.

That is, in the planetary gear 150b of the present embodiment, a disk portion 152 is formed, the disk portion 152 is adjacent to an axial end face of the gear portion 151, and an outer diameter of the disk portion 152 is the same as or larger than an outer diameter of the gear portion 151. Therefore, as shown in fig. 19, when the planetary gear 150b rotates while coming into contact with the rotation allowable portion 142 of the housing portion 140, the disk portion 152 smoothly rotates while coming into contact with the inner periphery of the rotation allowable portion 142, and generation of abnormal noise can be suppressed. The engaging portion 141 of the accommodating portion 140 is formed lower than that of the above-described embodiment, and the circular plate portion 152 does not abut against the engaging portion 141.

Fig. 20 and 21 show still another embodiment of the present invention. In this damper device 100d, the shape of the planetary gear 150c and the shape of the bottom surface of the housing portion 140 are different from those of the above-described embodiment.

That is, in the planetary gear 150c of the damper device 100d, as in the embodiment of fig. 17 to 19, a disk portion 152 is formed, the disk portion 152 is adjacent to an axial end face (upper end face in the drawing) of the gear portion 151, an outer diameter of the disk portion 152 is equal to or larger than an outer diameter of the gear portion 151, and a cylindrical portion 153 protruding downward smaller than the outer diameter of the gear portion 151 is formed in a central portion of an end face on the opposite side of the disk portion 152.

Further, a support groove 143 into which the cylindrical portion 153 is inserted is provided in the bottom surface of the housing portion 140 of the case 130. The support groove 143 is shaped to allow the planetary gear 150c to move along the outer periphery of the large diameter gear 116 by a distance that appropriately meshes with the large diameter gear 116. One end of the support groove 143 close to the rotation allowable portion 142 is formed in an arc shape conforming to the outer periphery of the columnar portion 153, and supports the columnar portion 153 when the planetary gear 150 moves to the rotation allowable portion 142, thereby smoothly rotating the planetary gear 150. As described above, in the present embodiment, since the movement of the planetary gear 150c is performed simultaneously with the guiding of the cylindrical portion 153 to the support groove 143, the planetary gear 150c can be moved without rattling, and the generation of abnormal noise due to the rotation and movement of the planetary gear 150c can be more effectively suppressed.

In fig. 22, yet another embodiment of the present invention is shown. In this damper device 100e, the shape of the large-diameter gear 116 is different from that of the above-described embodiment. That is, in the present embodiment, the upper edge portion 116a of the large-diameter gear 116 is disposed to extend in a flange shape so as to surround the outer periphery of the lid portion 118, and the lower surface of the upper edge portion 116a covers a part of the upper end surface of the planetary gear 150, so that the planetary gear 150 is prevented from coming off from the inside of the case 130.

According to the above embodiment, the planetary gear 150 is prevented from coming off by the upper edge portion 116a of the large-diameter gear 116 of the gear housing 115, and therefore the planetary gear 150 can be prevented from coming off at a position lower than the bottom wall 131 of the case 130, and the planetary gear 150 can be made less likely to tilt.

Description of reference numerals:

100. 100a, 100b, 100c, 100d damper means;

110 a rotary damper;

111 a rotor;

115 a gear housing;

116a large diameter gear;

118 a cover portion;

120 pinion gears;

130 a box body;

140 a housing part;

141 engaging parts;

142 a rotation allowing part;

143 a support groove;

150. 150a, 150b, 150c planetary gear;

a 151 gear portion;

152 a circular plate portion;

153 a cylindrical portion;

160 rack body;

170 rack bar;

l center line.

Claims

1. A damper device is characterized by comprising:

the box body is provided with: an accommodating portion that accommodates the planetary gear so that the planetary gear is movable by a predetermined distance in a circumferential direction of the large-diameter gear in a state of being meshed with the large-diameter gear of the rotation damper; an engaging portion provided on one side of an inner wall of the accommodating portion, the engaging portion limiting rotation of the planetary gear when the planetary gear abuts against the engaging portion; and a rotation allowing portion provided on the other side opposite to the one side of the inner wall of the housing portion, the rotation allowing portion allowing the planetary gear to rotate in a state where the planetary gear abuts against the rotation allowing portion,

2. The damper device of claim 1,

the inner surface of the gear body inside the case is arranged to be able to abut against at least a part of an axial end surface of the planetary gear housed in the housing portion of the case, thereby preventing the planetary gear from coming off.

3. The damper device of claim 1,

the gear housing is disposed so that a part thereof can abut against at least a part of an axial end surface of the planetary gear housed in a housing portion of the case, thereby retaining the planetary gear.

4. The damper device of claim 3,

the gear housing accommodates the rotor, and has: a main body having the large-diameter gear at an outer periphery thereof; and a cover portion attached to the opening portion of the main body so that a rotation shaft of the pinion gear is inserted, an outer peripheral edge portion of the cover portion forming a part of the gear housing that prevents the planetary gear from coming off.

5. The damper device according to any one of claims 1 to 4,

the planet gear and the large-diameter gear are formed by helical gears that mesh with each other, and the damper device is configured to generate a pressing force against the bottom surface of the case when the planet gear moves toward the rotation allowing portion of the housing.

6. The damper device according to any one of claims 1 to 5,

a disk portion having an outer diameter equal to or larger than the outer diameter of the planetary gear is provided adjacent to the axial end surface of the planetary gear, and the disk portion is configured not to contact the engagement portion.

7. The damper device according to any one of claims 1 to 6,

in the planetary gear, a cylindrical portion is provided at the center of an end surface facing the bottom surface side of the housing, and a support groove that supports the cylindrical portion so as to be movable by a predetermined distance is provided in the bottom surface of the housing portion of the housing along the circumferential direction of the large-diameter gear.

8. A damper device according to any one of claims 1 to 7,

the accommodating portions of the pair of cases are provided in a line-symmetrical shape with respect to a line passing through a rotation center of the rotary damper.