Vehicle door support device

Abstract

To provide a vehicle door support device with a brake member whose stability and durability are improved.SOLUTION: A vehicle door support device 10 includes a first support member 15A and a second support member 15B which have a first connection end 20a connected to a vehicle body 2 and a second connection end 25a connected to a door 3, respectively and which hold the door 3 in its open position relative to the vehicle body 2. Each of these members includes a cylindrical housing portion 21 having a first connecting end 20a, a cylindrical cover portion 22 connected to the opposite side of an end 21a of the housing portion 21, a cylindrical movable member 25 which has an end 21b serving as a second connecting end 25a, whose opposite side of the end 21b is housed within the cover portion 22, and which is movable in the axial direction relative to the cover portion 22, a spindle 34 disposed in the movable member 25, a conversion mechanism 37 which causes the spindle 34 to rotate by relative movement of the movable member 25 relative to the cover portion 22, and a brake member 50A arranged to have a fixed axial position relative to the spindle 34 and providing rotational resistance to the spindle 34.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle door support device. [Background technology]

[0002] A vehicle door is provided with a vehicle door support device that opens and closes the door by extending and retracting in an axial direction. The vehicle door support device may be provided with a brake mechanism to maintain the door open or to prevent the door from opening or closing suddenly.

[0003] The vehicle door support device described in Patent Document 1 includes a fixed shaft extending in the axial direction and a movable member arranged to cover the fixed shaft and expandable relative to the fixed shaft. An elastic member (brake member) that applies resistance to the expansion and contraction of the movable member is provided between the fixed shaft and the movable member. Specifically, the elastic member is fixed to the axial end of the fixed shaft so as to contact the inner surface of the movable member. When the movable member expands and contracts, frictional force is generated between the elastic member and the inner surface of the movable member, creating resistance to the linear sliding of the movable member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-017798 Summary of the Invention [Problem to be solved by the invention]

[0005] In the vehicle door support device described in Patent Document 1, resistance is applied to the linear sliding of the movable member. Therefore, when the movable member expands or contracts, the elastic member contacts the inner surface of the movable member over substantially the entire axial length. In other words, the elastic member contacts a wide area of ​​the movable member. As a result, the elastic member may be displaced by the expansion or contraction of the movable member, and the elastic member is prone to wear. In other words, the elastic member has poor stability and durability.

[0006] The present invention provides a vehicle door support device having improved stability and durability of the brake member. [Means for solving the problem]

[0007] The present invention provides a door opening / closing device comprising a first support member and a second support member, each having a first connection end connected to a vehicle body and a second connection end connected to a door, and holding the door in an open position relative to the vehicle body, wherein the first support member and the second support member each comprise a cylindrical housing portion having an end that constitutes one of the first connection end and the second connection end, a cylindrical cover portion connected to the opposite side of the end of the housing portion, a cylindrical movable member having an end that constitutes the other of the first connection end and the second connection end, the opposite side of which is housed in the cover portion and is movable in an axial direction relative to the cover portion, a spindle arranged in the movable member, a conversion mechanism that rotates the spindle by relative movement of the movable member with respect to the cover portion, and a brake member that is arranged so that the relative position of the spindle with respect to the spindle in the axial direction is fixed and that applies rotational resistance to the spindle. The brake member includes a cylindrical main body surrounding the spindle, and the main body has a plurality of contact portions recessed toward a central axis of the main body and in contact with the spindle, the contact portions being provided along a circumferential direction around the central axis. The present invention provides a vehicle door support device.

[0008] According to the present invention, when the door is opened or closed, the movable member moves relative to the cover portion, causing the spindle to rotate. Resistance is applied to the rotation of the spindle via the brake member. This reduces the speed at which the door opens or closes, preventing the door from opening or closing suddenly. The brake member is disposed such that its axial position relative to the spindle is fixed. In other words, unlike when resistance is applied to the linear movement of the spindle, the position of the brake member relative to the spindle does not displace along the axial direction of the spindle. Therefore, compared to when the relative position between the spindle and the brake member displaces, displacement and wear of the brake member are suppressed, and the stability and durability of the brake member can be improved. [Effects of the Invention]

[0009] According to the present invention, the stability and durability of the brake member can be improved. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a vehicle using a vehicle door support device according to the present invention; [Figure 2] FIG. 3 is a cross-sectional view of a driven support member according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view of the electric support member of the first embodiment. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5 . [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5 . [Figure 8] FIG. 10 is a side view showing a modified example of the brake member. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 2, showing a modified example of the first embodiment. [Figure 10] FIG. 10 is a cross-sectional view similar to FIG. 9, showing a modification of the first embodiment. [Figure 11] FIG. 10 is a cross-sectional view of a driven support member according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (First embodiment) FIG. 1 shows a state in which a door support device (vehicle door support device) 10 according to a first embodiment of the present invention is used in a vehicle 1. Referring to FIG. 1, the door support device 10 includes cylindrical support members 15A and 15B, which are arranged between a vehicle body 2 and a back door (door) 3. The support member (first support member) 15A located on the left side of the vehicle 1 in FIG. 1 is a driven type that expands and contracts in accordance with the opening and closing of the back door 3, and the support member (second support member) 15B located on the right side of the vehicle 1 in FIG. 1 is an electric type that expands and contracts electrically. The support member 15A may be an electric type, and the support member 15B may be a driven type.

[0012] Referring also to FIG. 2, the support member 15A includes a first housing 20 and a second housing 25 that are coaxial with the axis L1. The first housing 20 has a connection end (first connection end) 20a that is connected to the vehicle body 2 as a base end of the support member 15A. The second housing 25 has a connection end (second connection end) 25a that is connected to the tailgate 3 as a tip end of the support member 15A. The first housing 20 may be connected to the tailgate 3, and the second housing 25 may be connected to the vehicle body 2. By advancing the second housing 25 relative to the first housing 20, the tailgate 3 is held in an open position relative to the vehicle body 2. By retracting the second housing 25 relative to the first housing 20, the tailgate 3 can be closed relative to the vehicle body 2.

[0013] Referring to FIG. 2, the first housing 20 includes a cylindrical receiving portion 21 and a cylindrical cover portion 22 connected to the receiving portion 21.

[0014] A motor space 21c is provided inside the accommodation portion 21, in which an electric motor 70 (see FIG. 3) described later can be placed. In this embodiment, the electric motor 70 (see FIG. 3) described later is not placed in the motor space 21c of the support member 15A. The accommodation portion 21 has an end portion 21a and an end portion 21b opposite to the end portion 21a, and the end portion 21a is the connection end 20a. The connection end 20a is open and is closed by a shaft end member 23A. A cylindrical brake member space 21d in which a brake member 50A described later is placed is provided between the end portion 21b and the motor space 21c. The motor space 21c and the brake member space 21d are separated by a retaining wall having a through-hole 21e. 21f are separated by

[0015] The cover portion 22 is threadedly connected to the end portion 21b of the accommodation portion 21. In this embodiment, the outer diameter of the cover portion 22 is the same as the outer diameter of the accommodation portion 21. Inside the cover portion 22, there are provided a second housing space 22a for allowing the second housing 25 to retract, and a spindle space 22c for allowing the spindle nut 38 and push rod 39 (described later) to retract.

[0016] The second housing 25 is a cylindrical movable member that is coaxially disposed within the cover portion 22 and is movable in the axial direction L1 relative to the cover portion 22. The outer diameter of the second housing 25 is smaller than the inner diameter of the first housing 20, and the second housing 25 is accommodated within the first housing 20. The second housing 25 has a connecting end 25a. The connecting end 25a is open and is closed by an axial end member 26. The axial end member 26, including the connecting end 25a, protrudes from the tip end 20b of the first housing 20 (cover portion 22) even when the second housing 25 is retracted toward the base end relative to the first housing 20.

[0017] The support member 15A includes an extension mechanism 30.

[0018] The extension / contraction mechanism 30 includes a coil spring 32 that advances the second housing 25 relative to the first housing 20, a spindle 34 that guides the movement (extension / contraction) of the second housing 25 relative to the first housing 20, and a conversion mechanism 37.

[0019] The coil spring 32 elastically biases the second housing 25 toward the tip side relative to the first housing 20 (cover portion 22). The coil spring 32 is housed within the second housing 25 and in the second housing space 22a, and is disposed coaxially with the second housing 25. One end of the coil spring 32 abuts against the first housing 20, and the other end abuts against the second housing 25.

[0020] The spindle 34 extends along the axis L1 and is disposed coaxially with the axis L1 inside the second housing 25 and the cover portion 22. A base end portion 34a of the spindle 34 protrudes from the cover portion 22 and is inserted into the accommodation portion 21.

[0021] In this embodiment, the spindle 34 is cylindrical and has a helical portion 34b and a support portion 34c. The helical portion 34b has a helical groove. The support portion 34c is located closer to the base end 34a than the helical portion 34b and does not have a helical groove. The spindle 34 is rotatably supported by a bearing 35 located within the cover portion 22 via the support portion 34c. The base end 34a of the spindle 34c is inserted into the motor space 21c via the through hole 21e. A brake member 50A (described later) is located on the support portion 34c so as to provide rotational resistance within the cover portion 22.

[0022] The conversion mechanism 37 rotates the spindle 34 about the axis L1 by the relative movement of the second housing 25 with respect to the cover portion 22. In other words, the conversion mechanism 37 converts the linear movement of the second housing 25 relative to the cover portion 22 into the rotational movement of the spindle 34. The conversion mechanism 37 includes a spindle nut 38, a push rod 39, and a guide tube 40. These are arranged between the coil spring 32 and the spindle 34 in the radial direction of the second housing 25. Specifically, the guide tube 40 is arranged inside the coil spring 32, the push rod 39 is housed inside the guide tube 40, and the spindle nut 38 is fixed to one end of the push rod 39.

[0023] The spindle nut 38 and the push rod 39 are engaged with the guide tube 40 and the first housing 20 so as not to rotate relative to each other. Therefore, when the back door 3 is opened or closed, the linear movement of the spindle nut 38 relative to the guide tube 40 is converted into rotational movement of the spindle 34. In other words, as the back door 3 is opened or closed, the spindle 34 rotates while its position in the direction of the axis L1 is fixed.

[0024] The brake member 50A is disposed coaxially with the axis L1 on the support portion 34c of the spindle 34 so as to surround the spindle 34. Specifically, the brake member 50A is disposed in the brake member space 21d, and its position in the direction of the axis L1 is fixed by a retaining member 46 disposed between the bearing 35 and the brake member space 21d. In other words, one end of the brake member 50A abuts against the retaining wall 21d, and the other end of the brake member 50A abuts against the retaining member 46, thereby fixing the position of the brake member 50A in the direction of the axis L1. In other words, the brake member 50A is disposed such that its relative position in the direction of the axis L1 with respect to the spindle 34 is fixed. The retaining member 46 is fixed by being sandwiched between the accommodation portion 21 and the cover portion 22 via the bearing 35. As will be described in detail later, the brake member 50A is cylindrical and has a slit 55e (see FIG. 5) along the direction of the axis L1. The brake member 50A is pressed radially outward against the housing portion 21 by the support portion 34c of the spindle 34, and is thereby fixed non-rotatably to the housing portion 21. Specifically, the outer diameter of the brake member 50A is smaller than the diameter of the brake member space 21d, and when the support portion 34c of the spindle 34 is inserted into the brake member 50A, the brake member 50A expands radially and is pressed against the housing portion 21.

[0025] Referring to FIG. 4, the brake member 50A includes a main body 55 and a resin layer 60.

[0026] 5 to 7, the main body 55 is made of metal (e.g., stainless steel) and has a cylindrical shape centered on the central axis L2. The main body 55 is provided with four contact portions 55a, 55b, 55c, and 55d at approximately equal angles along the circumferential direction of the central axis L2. The contact portions 55a to 55d are recessed toward the central axis L2. The main body 55 also has a slit 55e and openings 55f, 55g, and 55h. The slit 55e is provided with a width h between the contact portions 55a and 55b along the central axis L2 and over the entire length of the main body 55. The openings 55f to 55h are provided with a width h along the circumferential direction of the central axis L2. That is, the slit 55e and the openings 55f to 55h have the same width h. The opening 55f is provided between the contact portions 55a and 55b. The opening 55g is provided between the contact portions 55b and 55c. The opening 55h is provided between the contact portions 55c and 55d. In the support member 15A of this embodiment, two sets of contact portions 55a to 55d are provided along the central axis L2, and one set of openings 55f to 55h is provided across the two sets of contact portions 55a to 55d. Two sets of openings 55f to 55h may be provided along the central axis L2. That is, one set of openings 55f to 55h may be provided for one set of contact portions 55a to 55d. The main body portion 55 may also be divided perpendicular to the central axis L2. That is, two brake members each having one set of contact portions 55a to 55d and openings 55f to 55h may be arranged in series along the central axis L2. Alternatively, the main body portion 55 may be divided along the central axis L2. That is, for example, a slit 55e may be provided instead of the opening 55g.

[0027] The resin layer 60 is made of resin (for example, fluororesin) and is provided on the entire inner surface of the main body portion 55. The resin layer 60 may be provided only on the inner surfaces of the contact portions 55a to 55d.

[0028] The brake member 50A contacts the support portion 34c of the spindle 34 via the resin layer 60 provided on the contact portions 55a to 55d. Therefore, the brake member 50A applies rotational resistance to the spindle 34 via the resin layer 60 provided on the contact portions 55a to 55d. In other words, the brake member 50A suppresses the rotation of the spindle 34.

[0029] 8, openings 55f-55h may have enlarged portions 55j whose widths gradually increase along central axis L2. Preferably, enlarged portions 55j are aligned with contact portions 55a-55d in the direction of central axis L2.

[0030] An elastic material such as rubber may be disposed on the inner surface of the brake member 50A instead of the resin layer 60 made of resin. Also, the main body 55 may be made of an elastic material such as rubber. In this case, the brake member 50A does not include the resin layer 60 and includes only the main body 55, and the main body 55 made of an elastic material directly contacts the support portion 34c of the spindle 34 and applies resistance to the rotation of the spindle 34.

[0031] The brake member 50A may also be a leaf spring. In this case, the leaf spring is fixed to the brake member space 21d, and the portion that elastically deforms relative to the fixed portion comes into contact with the support portion 34c of the spindle 34, so that the leaf spring applies resistance to the rotation of the spindle 34.

[0032] The configuration of support member 15B will be described with reference to Figure 3. Support member 15B includes an electric motor 70 and a gear mechanism 44. Furthermore, connecting end 20a is closed by a shaft end member 23B that is different from shaft end member 23A. Other configurations are the same as those of support member 15A, and therefore descriptions thereof may be omitted.

[0033] As described above, the support member 15B is an electrically operated member that can be extended and retracted by driving the electric motor 70. Therefore, in this embodiment, the back door 3 can be opened and closed automatically.

[0034] The electric motor 70 is a driving means capable of forward and reverse rotation, and is electrically connected to an ECU (Electronic Control Unit) of the vehicle 1. The electric motor 70 is disposed in the motor space 21c and includes an output shaft 70a that protrudes toward the spindle 34. The output shaft 70a is connected to the base end 34a of the spindle 34 via a gear mechanism 44.

[0035] The gear mechanism 44 includes a plurality of gears 45A, 45B, 45C, and 45D. Rotation of the output shaft 70a causes the gears 45A to 45D to rotate, and the spindle 34 to rotate. The rotational motion of the spindle 34 is converted into linear motion of the spindle nut 38 relative to the guide tube 40 via the conversion mechanism 37. This causes the spindle nut 38 and the push rod 39 to move in the axial direction. Furthermore, the movement of the push rod 39 causes the second housing 25 to move relative to the first housing 20.

[0036] In the support member 15B, the accommodation portion 21 does not have the brake member space 21d (see FIG. 2), and the cover portion 22 has a cylindrical brake member space 22b between the spindle space 22c and the bearing 35. The spindle space 22c and the brake member space 22b are separated by a retaining wall 22e having a through-hole 22d. The support portion 34c of the spindle 34 is inserted into the through-hole 22d.

[0037] A brake member 50B is disposed in the brake member space 22b and fixed to the cover portion 22. Specifically, the brake member 50B disposed in the brake member space 22b has its position in the axial direction L1 fixed by a retaining member 47 disposed between the bearing 35 and the brake member space 22b. In other words, one end of the brake member 50B abuts against the retaining wall 22e, and the other end of the brake member 50B abuts against the retaining member 47, thereby fixing the position of the brake member 50B in the axial direction L1. The retaining member 47 is fixed by being sandwiched between the accommodation portion 21 and the cover portion 22 via the bearing 35. The configuration of the brake member 50B is similar to that of the brake member 50A (see FIG. 4), and therefore detailed illustration is omitted. However, the brake member 50B includes a set of contact portions 55a to 55d and openings 55f to 55h. Similarly to the brake member 50A, the brake member 50B is pressed against the cover portion 22 radially outward by the support portion 34c of the spindle 34, and is fixed to the cover portion 22 so as not to be rotatable.

[0038] Hereinafter, the operation of the support members 15A and 15B in this embodiment when the back door 3 is opened or closed will be described.

[0039] When the back door 3 is closed relative to the vehicle body 2, the second housing 25 is retracted relative to the first housing 20. In this state, the coil spring 32 is compressed, and the spindle nut 38 is located near the base end 34a of the spindle 34.

[0040] When the tailgate 3 is operated to open, the electric motor 70 of the support member 15B is driven to open by a command from the ECU and rotates in the normal direction. When the electric motor 70 rotates in the normal direction, the spindle 34 rotates via the conversion mechanism 37, and the second housing 25 advances relative to the cover portion 22. At this time, the elastic force of the coil spring 32 acts in a direction to advance the second housing 25, and the weight of the tailgate 3 acts in a direction to retreat the second housing 25. In addition, the frictional force of the brake members 50A, 50B acts to suppress the advancement of the second housing 25. In other words, the combined force of the driving force of the electric motor 70 in the normal direction and the elastic force of the coil spring 32 becomes greater than the combined force of the weight of the tailgate 3 and the frictional force of the brake members 50A, 50B, causing the second housing 25 to advance relative to the cover portion 22. When the back door 3 rotates to the open position relative to the vehicle body 2, the back door 3 is held by the elastic force of the coil spring 32, the frictional force of the gears 45A to 45D, the cogging torque of the electric motor 70, and the frictional force of the brake members 50A and 50B.

[0041] When the tailgate 3 is closed, the electric motor 70 of the support member 15B is driven to close by a command from the ECU and rotates in the reverse direction. When the electric motor 70 rotates in the reverse direction, the spindle 34 rotates via the conversion mechanism 37, causing the second housing 25 to move backward relative to the cover portion 22. At this time, the elastic force of the coil spring 32 acts in a direction to advance the second housing 25, and the weight of the tailgate 3 acts in a direction to move the second housing 25 backward. In addition, the frictional force of the brake members 50A, 50B acts to suppress the backward movement of the second housing 25. In other words, the combined force of the driving force of the electric motor 70 in the reverse direction and the weight of the tailgate 3 becomes greater than the combined force of the elastic force of the coil spring 32 and the frictional force of the brake members 50A, 50B, causing the second housing 25 to move backward relative to the cover portion 22.

[0042] In both cases where the back door 3 is opening and closing, the brake members 50A, 50B act to suppress the movement of the back door 3. Therefore, even if the electric motor 70 fails and the balance of forces acting on the back door 3 is lost, the brake members 50A, 50B suppress the movement of the back door 3 and prevent the back door 3 from suddenly opening or closing.

[0043] According to this embodiment, the second housing 25 moves relative to the cover portion 22 as the tailgate 3 opens and closes, causing the spindle 34 to rotate. At this time, resistance is applied to the rotation of the spindle 34 via the brake members 50A and 50B. This reduces the opening and closing speed of the tailgate 3, preventing the tailgate 3 from opening and closing abruptly. Furthermore, the brake members 50A and 50B are disposed such that their relative positions in the axial direction L1 with respect to the spindle 34 are fixed. In other words, unlike when resistance is applied to the linear movement of the spindle 34, the positions of the brake members 50A and 50B with respect to the spindle 34 do not displace along the axial direction L1 of the spindle 34. Therefore, compared to when the relative positions of the spindle 34 and the brake members 50A and 50B displace, positional deviation and wear of the brake members 50A and 50B are suppressed, and the stability and durability of the brake members 50A and 50B can be improved.

[0044] The coil spring 32 acts to support part or all of the weight of the back door 3 when the back door 3 is opened or closed. This reduces the force required to open or close the back door 3. This makes it possible to easily open and close the back door 3. In this embodiment, the back door 3 is opened and closed by an electric motor 70. Therefore, by providing the coil spring 32, the output of the electric motor 70 can be reduced.

[0045] Furthermore, since the electric motor 70 is provided, the back door 3 can be opened and closed automatically. Therefore, the back door 3 can be opened and closed easily.

[0046] Furthermore, because the driven support member 15A and the electrically driven support member 15B share the same basic components, manufacturing costs can be reduced compared to when different components are used. Also, balance adjustment when controlling the opening and closing of the back door 3 is easy.

[0047] In the support member 15A, the brake member 50A is 21d Since the electric motor 70 is not disposed in the motor space 21c of the support member 15A, the length of the brake member 50A can be set arbitrarily. Therefore, the frictional force that the brake member 50A applies to the spindle 34 can be set arbitrarily.

[0048] Furthermore, the brake members 50A, 50B apply resistance to the spindle 34 via the resin layer 60. Therefore, durability can be improved compared to when resistance is applied to the spindle 34 via an elastic body such as rubber.

[0049] Furthermore, the brake members 50A, 50B are provided with a plurality of contact portions 55a-55d along the circumferential direction of the central axis L2, thereby improving the frictional force with respect to the spindle 34. Furthermore, the provision of the contact portions 55a-55d makes it easier to insert the spindle 34 into the brake members 50A, 50B and to set the frictional force as desired, compared to when the spindle 34 is surrounded by the entire inner surface of the main body portion 55.

[0050] The door support device 10 may include a driven support member 15A instead of the electrically driven support member 15B. That is, the door support device 10 may include two sets of driven support members 15A. In this case, the back door 3 is opened and closed manually, but manufacturing costs can be reduced. Furthermore, because the support members 15A and 15B have the same configuration, balance adjustment can be easily performed to evenly support the weight of the back door 3.

[0051] The door support device 10 may also include an electrically driven support member 15B instead of the driven support member 15A. That is, the door support device 10 may include two sets of electrically driven support members 15B. In this case, since the support members 15A and 15B have the same configuration, it is easy to perform balance adjustment to evenly support the weight of the back door 3.

[0052] Grease may be applied between the support portion 34c of the spindle 34 and the contact portions 55a to 55d. This prevents deterioration of the brake member 50A with use and changes in frictional resistance due to temperature, and provides stable rotational resistance.

[0053] 9, as a modified example, the brake member 50A may be provided with a flange 55i that protrudes radially outward to face the slit 55e. In this case, the housing portion 21 is provided with a groove 21g that is aligned with the flange 55i and extends in the direction of the axis L1 (see FIG. 2). By fitting the flange 55i into the groove 21g, the position of the brake member 50A around the central axis L2 can be maintained, and the brake member 50A can be reliably prevented from rotating together with the spindle 34.

[0054] 10, as a further modification, a protrusion 21h may be provided in the accommodation portion 21. The protrusion 21h is convex toward the brake member space 21d. By fitting the protrusion 21h into the slit 55e, the position of the brake member 50A around the central axis L2 can be maintained, and the brake member 50A can be reliably prevented from rotating together with the spindle 34. (Second embodiment) 11, the configuration of the door support device 10 according to the second embodiment differs from that of the first embodiment in the following respects: The other configurations of the second embodiment are the same as those of the first embodiment, and the same reference numerals are used to designate elements that are the same as or similar to those of the first embodiment.

[0055] In the second embodiment, the door support device 10 includes a support member 15C instead of the support member 15A. The support member 15C includes a brake member 50B in addition to the configuration of the support member 15A.

[0056] In the support member 15C, the cover portion 22 has a brake member space 22b between the second housing space 22a and the bearing 35. A brake member 50B is disposed in the brake member space 22b and fixed to the cover portion 22.

[0057] In the door support device 10 of the second embodiment, two brake members 50A, 50B are arranged on the support member 15C, which increases the frictional force on the spindle 34 and can further suppress the rotation of the spindle 34. Therefore, the degree of freedom in adjusting the balance of the door support device 10 can be improved, for example, to accommodate an increase in the weight of the back door 3. [Explanation of symbols]

[0058] 1 vehicle 2. Body 3 Backdoor (door) 10 Door support device (vehicle door support device) 15A, 15C Support member (first support member) 15B Support member (second support member) 20 First Housing 20a Connection end (first connection end) 20b Tip 21 Storage unit 21a, 21b end 21c Motor space 21d Brake member space 21e Through hole 21f retaining wall 21g Groove 21h convex part 22 Cover 22a Second housing space 22b Brake member space 22c spindle space 22d through hole 22e retaining wall 23A, 23B Shaft end member 25 Second Housing 25a Connection end (second connection end) 26 Shaft end member 30 Telescopic mechanism 32 coil spring 34 Spindle 34a Proximal end 34b Spiral part 34c Support part 35 bearings 37 Conversion Mechanism 38 Spindle nut 39 Push rod 40 Guide tube 44 Gear mechanism 45A~45D gear 46 Retaining member 47 Retaining member 50A, 50B Brake member 55 Main body 55a~55d Contact part 55e slit 55f~55h opening 55i flange 55j Enlarged section 60 resin layer 70 Electric Motor 70a output shaft

Claims

1. a first support member and a second support member, each having a first connection end connected to a vehicle body and a second connection end connected to a door, for holding the door in an open position relative to the vehicle body; The first support member and the second support member each include: a cylindrical housing portion having an end portion that constitutes one of the first connection end and the second connection end; a cylindrical cover portion connected to the opposite side of the end portion of the storage portion; a cylindrical movable member having an end portion that constitutes the other of the first connection end and the second connection end, the opposite side of which is housed within the cover portion, and movable in the axial direction relative to the cover portion; a spindle disposed within the movable member; a conversion mechanism that rotates the spindle by relative movement of the movable member with respect to the cover portion; a brake member that is disposed so that its relative position with respect to the spindle in the axial direction is fixed and that applies rotational resistance to the spindle; Equipped with The brake member includes a cylindrical body portion surrounding the spindle, The vehicle door support device, wherein the main body portion has a plurality of contact portions recessed toward a central axis of the main body portion and in contact with the spindle, the contact portions being provided along a circumferential direction around the central axis.

2. 2. The vehicle door support device according to claim 1, wherein at least one of the first support member and the second support member includes an electric motor connected to the spindle for rotating the spindle.

3. 3. The vehicle door support device according to claim 1, wherein at least one of the first support member and the second support member is provided with a coil spring disposed within the movable member and biasing the movable member in a direction of advancing toward the cover portion.

4. The vehicle door support device according to claim 1 , wherein the brake member is fixed to the housing portion.

5. The vehicle door support device according to any one of claims 1 to 4, wherein the brake member is fixed to the cover portion.

6. a support member having a first connection end connected to a vehicle body and a second connection end connected to a door, the support member holding the door in an open position relative to the vehicle body; The support member is a cylindrical housing portion having an end portion that constitutes one of the first connection end and the second connection end; a cylindrical cover portion connected to the opposite side of the end portion of the storage portion; a cylindrical movable member having an end portion that constitutes the other of the first connection end and the second connection end, the opposite side of which is housed within the cover portion, and movable in the axial direction relative to the cover portion; a spindle disposed within the movable member; a conversion mechanism that rotates the spindle by relative movement of the movable member with respect to the cover portion; a brake member that is disposed so that its relative position with respect to the spindle in the axial direction is fixed and that applies rotational resistance to the spindle; Equipped with The brake member includes a cylindrical body portion surrounding the spindle, The vehicle door support device, wherein the main body portion has a plurality of contact portions recessed toward a central axis of the main body portion and in contact with the spindle, the contact portions being provided along a circumferential direction around the central axis.

7. The main body is made of metal, the brake member further includes a resin layer provided on an inner surface of the main body portion, The contact portion is in contact with the spindle via the resin layer. The vehicle door support device according to any one of claims 1 to 6.

8. A vehicle door support device as described in any one of claims 1 to 7, wherein the brake member has a slit extending axially over its entire length, which is expanded by inserting the spindle into the brake member and is pressed against the wall of the accommodating section or the cover section.

9. A vehicle door support device as described in any one of claims 1 to 8, wherein a plurality of the brake members are arranged relative to the spindle.

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