Cable drum and object moving device

Abstract

To provide a cable drum that can suppress the generation of abnormal noise due to interference with a wire.SOLUTION: A cable drum includes a groove portion formed in a spiral shape in which a cable is accommodated, and a flange portion formed in a spiral shape to partition spaced neighboring sections of the groove portion, and the flange portion has a first arc tangentially discontinuously connected to a line corresponding to a tip portion of the flange portion in a cross-section including the central axis of the cable drum, and the first arc portion is convex outwardly.SELECTED DRAWING: Figure 3B

Description

[Technical field]

[0001] The present invention relates to a cable drum and an object moving device. [Background technology]

[0002] Patent Document 1 discloses a drum housing provided on a curved guide rail and a drum accommodated in the drum housing.

[0003] This guide rail has a curved portion and a bent portion. The bent portion is provided below the curved portion and is bent from the lower end of the curved portion toward the outside of the vehicle. With this configuration, even if the guide rail is curved in an arch shape, the angle at which the wire enters the drum can be made small, thereby suppressing abnormal noise caused by the wire interfering with the top of the groove wall formed in the drum. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-17312 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the conventional technology disclosed in Patent Document 1 requires bending of the guide rail, and therefore there is room for improvement in terms of suppressing abnormal noise caused by interference of the wire with the drum.

[0006] An object of the present invention is to provide a cable drum and an object moving device that can suppress the generation of abnormal noise due to interference with the wire. [Means for solving the problem]

[0007] The cable drum of the present invention is a cable drum comprising a spirally formed groove portion in which a cable is accommodated, and a spirally formed flange portion separating adjacent groove portions, wherein the flange portion has a first arc that is tangent discontinuously connected to a line corresponding to the tip portion of the flange portion in a cross section including the central axis of the cable drum, and the first arc portion has a shape that is convex outward.

[0008] The object moving device of the present invention includes a carrier plate for moving an object to be moved and the above-mentioned cable drum. Effect of the Invention

[0009] According to the present invention, it is possible to obtain a cable drum and an object moving device that can suppress the generation of abnormal noise due to interference with the wire. [Brief description of the drawings]

[0010] [Figure 1A] FIG. 1 is a front view of an object moving device 100 according to an embodiment of the present invention. [Figure 1B] FIG. 1 is a side view of an object moving device 100 according to an embodiment of the present invention. [Figure 2A] Exploded view of drive unit 5 [Figure 2B] A perspective view of the cable drum 53 [Figure 2C] Side of cable drum 53 [Figure 2D] FIG. 1 is a diagram for explaining a lead angle θ. [Figure 3A] Close-up of cable drum 53 [Figure 3B] Cross-section of cable drum 53 [Figure 3C] Cross-section of cable drum 53 [Figure 4A] 1 is a cross-sectional view of a cable drum 53 according to a first comparative example. [Figure 4B] 11 is a cross-sectional view of a cable drum 53 according to a second comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0012] FIG. 1A is a front view of an object moving device 100 according to an embodiment of the present invention, and FIG. 1B is a side view of the object moving device 100 according to the embodiment of the present invention.

[0013] The object moving device 100 is attached to, for example, an inner panel of a vehicle door, and is applied to a window regulator or the like that moves a window glass attached to the carrier plate 1 by moving the carrier plate 1.

[0014] In this embodiment, the object to be moved is a window glass attached to the carrier plate 1. In the case of an application example of a window regulator, the moving direction of the carrier plate 1 is the up-down direction defined based on the rising and lowering direction of the window glass, which is the object to be moved.

[0015] The object moving device 100 includes a carrier plate 1 , a guide rail 2 , a cable guide unit 3 , a cable 4 , and a drive unit 5 .

[0016] (Carrier Plate 1) The carrier plate 1 is a member that holds the window glass and moves it up and down on the guide rails 2. The carrier plate 1 is equipped with a mounting section for mounting the window glass, a storage section for storing the cable 4, a guide section for guiding it up and down on the guide rails 2, etc.

[0017] (Guide rail 2) The guide rail 2 is a member that extends in the moving direction of the window glass and guides the rising and lowering of the carrier plate 1. The guide rail 2 is made of a material such as plated steel sheet, stainless steel, aluminum alloy, synthetic resin, etc. A cable guide unit 3 is attached to the upper end of the guide rail 2, and a drive unit 5 is attached to the lower end of the guide rail 2.

[0018] (Cable guide part 3) The cable guide portion 3 is an example of a direction changing portion that changes the moving direction of the cable 4. The material of the cable guide portion 3 is, for example, a synthetic resin.

[0019] (Cable 4) The cable 4 is a pulling member that transmits the driving force generated by the driving unit 5 to the carrier plate 1 to pull the carrier plate 1. The cable 4 is a flexible cable made of twisted metal wires, resin fiber wires, etc. The cable 4 is composed of two cables 4a and 4b.

[0020] One end of the cable 4a is connected to the carrier plate 1. The cable 4a extends from the carrier plate 1 toward the cable guide section 3, and further extends to the drive section 5 via the cable guide section 3. The other end of the cable 4a is connected to a cable drum provided inside the drive section 5. The configuration of the cable drum will be described in detail later.

[0021] One end of the cable 4b is also connected to the carrier plate 1. The cable 4b extends from the carrier plate 1 toward the drive unit 5, and the other end of the cable 4b is connected to a cable drum. Hereinafter, when there is no need to distinguish between the cables 4a and 4b, they will be referred to as "cable 4."

[0022] (Drive unit 5) The driving unit 5 is a driving device that moves the carrier plate 1 by winding and unwinding the cable 4. An example of the configuration of the driving unit 5 will be described with reference to Figs. 2A to 2D.

[0023] 2A is an exploded view of the driving unit 5, FIG. 2B is a perspective view of the cable drum 53, FIG. 2C is a side view of the cable drum 53, and FIG. 2D is a diagram for explaining the lead angle θ.

[0024] As shown in FIG. 2A, the drive unit 5 includes two housings 51, 52, a cable drum 53 stored inside the two housings 51, 52, a motor 54 provided in the housing 52, and a transmission unit 55 composed of gears or the like, which transmits the rotation of the motor 54 to the cable drum 53.

[0025] 2B and 2C, cable drum 53 is a cylindrical member having a predetermined thickness in the extension direction of central axis CL (axial direction D), and winds or unwinds cable 4 shown in Fig. 1. Cable drum 53 is manufactured by insert molding, die casting, or the like, using a mold that has been subjected to a predetermined processing.

[0026] The outer peripheral surface 10 of the cable drum 53 is formed with a spirally formed groove portion 11 in which the cable 4 is housed, and a spirally formed flange portion 12 which separates adjacent groove portions 11.

[0027] A recess 13 is formed in a first end face 14a in the axial direction D of the cable drum 53, which is a depression for engaging with a metal fixing member provided at the end of the cable 4. A similar recess 13 is also formed on a second end face 14b side of the cable drum 53 opposite to the first end face 14a side in the axial direction D.

[0028] When the cable drum 53 rotates in the forward direction with the fixing member for the cable 4 fitted in the recess 13, the cable 4a is wound into the groove portion 11 and the cable 4b is paid out from the groove portion 11. When the cable drum 53 rotates in the reverse direction, the cable 4b is wound into the groove portion 11 and the cable 4a is paid out from the groove portion 11.

[0029] Specifically, when the motor 54 rotates in the forward direction, the rotational motion of the motor 54 is transmitted to the cable drum 53 via the transmission unit 55, causing the cable drum 53 to rotate in the forward direction. In this case, the cable 4a is wound onto the cable drum 53, and the cable 4b is unwound from the cable drum 53. This causes the carrier plate 1 to rise.

[0030] On the other hand, when the motor 54 rotates in the reverse direction, the cable drum 53 rotates in the reverse direction, so that the cable 4b is wound onto the cable drum 53 and the cable 4a is unwound from the cable drum 53. This causes the carrier plate 1 to descend.

[0031] 1B, when the guide rail 2 is curved in an arch shape corresponding to the ascending and descending trajectory of the window glass, when the position of the carrier plate 1 in the vertical direction of the guide rail 2 changes due to the movement of the carrier plate 1, the position of the carrier plate 1 also changes with respect to the curved direction perpendicular to the vertical direction of the guide rail 2. Therefore, when the position of the carrier plate 1 changes, a predetermined lead angle θ (see FIG. 2D) is generated between the extending direction D1 of the cable 4 extending from the carrier plate 1 toward the cable drum 53 and the extending direction D2 of the cable 4 in the state where it is wound in the groove portion 11.

[0032] When the lead angle θ reaches or exceeds a predetermined value, the cable 4 approaches the tip of the flange 12. At this time, if there is a connection point between arcs with different curvatures on the surface of the tip of the flange 12, the surface of the cable 4 may get caught on this connection point, causing abnormal noise.

[0033] The cable drum 53 according to the present embodiment includes a flange 12 and a groove 11 having the shapes described below in order to suppress the generation of abnormal noise caused by interference of the cable 4 with the flange 12. An example of the configuration of the cable drum 53 will be described with reference to Figs. 3A to 3C.

[0034] FIG. 3A is an enlarged view of the cable drum 53, and FIGS. 3B and 3C are cross-sectional views of the cable drum 53.

[0035] (Flange 12) In a cross section S (see the dotted line in Figure 3A) including the central axis CL of the cable drum 53, the flange portion 12 has a shape in which the third arc 20c corresponding to the tip portion 12a of the flange portion 12 and the first arc 20a are connected in a discontinuous tangent manner, and the first arc 20a is convex outward.

[0036] Here, the third arc 20c is an arc whose curvature is greater than that of the first arc 20a.

[0037] In the flange 12 configured in this manner, a part of the imaginary circle V including the first arc 20a passes inside the imaginary circle V including the third arc 20c, as shown in Fig. 3C. This is because the first arc 20a is connected to the third arc 20c corresponding to the tip portion 12a of the flange 12 in a discontinuous tangent manner.

[0038] Therefore, the connection point (second connection point 21b) between the first arc 20a and the third arc 20c can be located at a position away from the connection point (first connection point 21a) between the first arc 20a and the second arc 20b in the axial direction D (see Figure 3B).

[0039] Therefore, as shown in FIG. 3B, the distance from the cable 4 located on the first arc 20a to the second connection point 21b becomes larger, so that even if the cable 4 moves toward the tip portion 12a of the flange portion 12, the cable 4 is less likely to get caught on the second connection point 21b, thereby suppressing the generation of abnormal noise.

[0040] (Groove 11) As shown in Fig. 3B, the second arc 20b is tangentially connected to the first arc 20a on the side opposite to the third arc 20c. The second arc 20b has a curvature smaller than that of the first arc 20a. The groove 11 has a concave shape formed by the second arc 20b in a cross section S including the central axis CL of the cable drum 53.

[0041] FIG. 4A is a cross-sectional view of a cable drum 53 according to a first comparative example, and FIG. 4B is a cross-sectional view of a cable drum 53 according to a second comparative example.

[0042] In the cable drum 53 shown in FIG. 4A, the first circular arc 20a is tangentially connected to the second circular arc 20b, and the first circular arc 20a is tangentially connected to the third circular arc 20c.

[0043] Therefore, the distance from the connection point (second connection point 21b) of the first arc 20a and the third arc 20c shown in FIG. 4A to the connection point (first connection point 21a) of the first arc 20a and the second arc 20b is shorter than the distance from the second connection point 21b to the first connection point 21a shown in FIG. 3B.

[0044] As a result, in the first comparative example, the distance from the cable 4 located on the first arc 20a to the second connection point 21b is shortened, so that when the cable 4 moves toward the tip portion 12a of the flange portion 12, the cable 4 is likely to get caught on the second connection point 21b, which may result in abnormal noise.

[0045] In the case where a flat surface 20a1 is formed instead of the first arc 20a as in the second comparative example shown in Fig. 4B in order to make it difficult for the cable 4 to get caught on the second connection point 21b, the thickness of the tip portion 12a of the flange portion 12 in the axial direction D is reduced. For this reason, in the second comparative example, in the mold for manufacturing the cable drum 53, the resin does not flow into the portion corresponding to the flange portion 12, which may reduce the yield.

[0046] If the thickness of the flange portion 12 in the axial direction D is increased to address this issue, the pitch between adjacent groove portions 11 in the axial direction D will increase, and the thickness of the entire cable drum 53 in the axial direction D will increase. As a result, the drive unit 5 including the cable drum 53 will become larger, which may result in disadvantages such as a decrease in the layout flexibility of the object movement device on the vehicle.

[0047] As described above, the cable drum 53 in this embodiment comprises a spirally formed groove portion in which a cable is accommodated, and a spirally formed flange portion separating adjacent groove portions, and in a cross section including the central axis of the cable drum, the flange portion has a first arc that is tangent discontinuously connected to a line corresponding to the tip portion of the flange portion, and the first arc portion has a shape that is convex outward.

[0048] With this configuration, the connection point where the first arc and the third arc are connected is shifted toward the tip of the flange from the connection point where the first arc and the second arc are tangentially connected, so that the cable 4 is less likely to get caught on the tip of the flange without significantly narrowing the thickness of the tip of the flange, and the possibility of abnormal noise can be suppressed. In addition, since the third arc and the first arc corresponding to the tip of the flange are discontinuously connected to each other, the thickness of the tip of the flange in the axial direction can be suppressed from becoming smaller while the pitch between adjacent grooves in the axial direction can be suppressed from increasing. Therefore, the layout of the object moving device for the vehicle can be suppressed while suppressing a decrease in yield.

[0049] The third arc is not limited to an arc, and may be a line other than an arc, such as a straight line, etc. Even in this case, the same remarkable effect as in the above-mentioned configuration can be obtained.

[0050] It should be noted that, for example, the following aspects are also understood to fall within the technical scope of the present disclosure.

[0051] (1) The cable drum of the present disclosure comprises a spirally formed groove portion in which a cable is accommodated, and a spirally formed flange portion separating adjacent groove portions, wherein the flange portion has a first arc that is tangent discontinuously connected to a line corresponding to a tip portion of the flange portion in a cross section including a central axis of the cable drum, and the first arc portion has a shape that is convex outward.

[0052] (2) In the cross section, the groove has a concave shape formed by tangent-continuously connecting the first arc and a second arc having a curvature smaller than that of the first arc.

[0053] (3) The line corresponding to the tip portion of the flange is a third arc having a curvature greater than the curvature of the first arc.

[0054] (4) The connection point where the first arc and the third arc are connected is a connection point between the first arc and the third arc. 2 The arc is tangent to ContinuouslyIt is located on the side of the tip portion relative to the connection point when connected.

[0055] (5) The first arc passes inside an imaginary circle that includes the third arc.

[0056] (6) The object moving device disclosed herein includes a carrier plate that moves an object to be moved, and the above-mentioned cable drum.

[0057] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims, such as equivalents.

[0058] The above describes the embodiment of the present invention. Note that the above description is an example of a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. In other words, the description of the configuration of the above device and the shape of each part are examples, and it is clear that various modifications and additions to these examples are possible within the scope of the present invention. [Industrial Applicability]

[0059] INDUSTRIAL APPLICABILITY The cable drum and object moving device according to the present invention are useful as structures capable of suppressing the generation of abnormal noise due to interference with wires. [Explanation of symbols]

[0060] 1 Carrier Plate 2 Guide rails 3 Cable guide 4 Cable 4a cable 4b Cable 5 Drive unit 10 Outer surface 11 Groove 12 Flange 12a Tip part 13 Recess 14a First end surface 14b Second end face 20a First Arc 20a1 Flat surface 20b Second Arc 20c Third Arc 21a First connection point 21b Second connection point 51 Housing 52 Housing 53 Cable Drum 54 Motor 55 Transmission section 100 Object moving device CL center axis D-axis direction D1 Stretching direction D2 Stretching direction V Imaginary circle θ Lead angle S cross section

Claims

1. A cable drum comprising: a spirally formed groove portion in which the cable is housed; A flange portion formed in a spiral shape to partition adjacent groove portions; Equipped with In a cross section including a central axis of the cable drum, the flange portion has a first arc that is tangent discontinuously connected to a line corresponding to a tip end portion of the flange portion, and the first arc portion has a shape that is convex outward. Cable drum.

2. The cable drum according to claim 1, wherein the groove portion has a concave shape formed in the cross section by tangent-connecting the first arc and a second arc having a curvature smaller than that of the first arc.

3. 3. The cable drum according to claim 1, wherein a line corresponding to a tip portion of the flange portion is a third arc having a curvature larger than that of the first arc.

4. The line corresponding to the tip portion of the flange is a third arc having a curvature greater than the curvature of the first arc, 3. The cable drum according to claim 2, wherein a connection point where the first circular arc and the third circular arc are connected is located closer to the tip portion than a connection point where the first circular arc and the second circular arc are connected tangent to each other.

5. The cable drum according to claim 3 or 4, wherein the first arc passes inside an imaginary circle including the third arc.

6. An object moving device comprising: a carrier plate for moving an object to be moved; and the cable drum according to any one of claims 1 to 5.

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