JP4927130B2 - Door mirror device and shaft forming method thereof - Google Patents

Description

  The present invention relates to a vehicle door mirror device that is electrically or manually placed in either a deployed state or a retracted state, and a shaft forming method used in the door mirror device.

  A door mirror device is attached to a vehicle (for example, an automobile). This door mirror device is disposed either in an unfolded state or a retracted state by electric or manual operation (see, for example, Patent Document 1). FIG. 1 is a schematic view of a door mirror device 100 that is electrically deployed and stored. As shown in FIG. 1, a door mirror device 100 includes a housing 2 (device main body) that houses a door mirror 1 and a shaft that is fixed to a connecting portion 3 of a vehicle and serves as a rotation center when the housing 2 is rotated. 4, a bracket 5 fixed to the housing 2 and fitted to the shaft 4, and a motor 6 attached to the bracket 5. The motor-side gear 7 inserted through the motor shaft of the motor 6 and the shaft-side gear 8 inserted through the shaft 4 are engaged with each other. By rotating the motor shaft of the motor 6, the housing 2 rotates around the axis CL of the shaft 4 fixed to the connecting portion 3.

  As shown in FIG. 1, the shaft 4 has a stepped shape, the first shaft portion 9 having the largest diameter fixed to the connecting portion 4, and the first shaft portion 9 having a smaller diameter in order. A second shaft portion 11 and a third shaft portion 12 extending concentrically with the shaft portion 9 are provided. The bracket 5 of the housing 2 is inserted through the second shaft portion 11 of the shaft 4. At this time, the bottom surface portion 5 a of the bracket 5 is brought into contact with the stepped surface 13 of the shaft 4. For this reason, the housing 2 rotates while bringing the bottom surface portion 5 a of the bracket 5 into contact with the stepped surface 13 of the shaft 4. As a result, the weights of the door mirror 1, the housing 2, the bracket 5, the motor 6 and the like act on the stepped surface 13 of the shaft 4.

  The shaft 4 of the conventional door mirror device 100 uses a metal material (for example, ZDC (zinc die cast) or ADC (aluminum die cast)) having high rigidity and excellent strength and vibration resistance. However, since the shaft 4 becomes heavy, it is necessary to reduce the weight.

  From the above, it is assumed that the shaft 4 made of a resin material is used. However, although the shaft 4 made of a resin material is light, it has a problem that it is inferior in strength and vibration resistance because the rigidity is lower than that of a metal material.

JP 2003-231442 A

  This invention is made | formed in view of said situation, and makes it a subject to provide the door mirror apparatus excellent in intensity | strength and vibration resistance, without making a shaft heavy, and to provide the shaping | molding method of the shaft.

The present invention for solving the above problems is as follows.
A device body for storing the door mirror is rotated around the axis of the shaft, whereby the device body is a door mirror device arranged in either the unfolded state or the retracted state,
The shaft is formed by injection molding a resin material, and supports a first shaft portion that supports the weight of the device main body portion, and the device main body portion so as to be rotatable. The shaft is perpendicular to the first shaft portion. A stepped shape having a second shaft portion having a small cross-sectional area;
The shaft is made of a metal material, and has a cylindrical main body, a flange extending in a direction perpendicular to the axis from the outer peripheral surface of one axial end of the main body, and an axial projection from the flange. A reinforcing member having a protruding portion is insert-molded across the first shaft portion and the second shaft portion,
The sum of the axial length of the protrusion and the thickness of the flange is the same as or longer than the thickness of the first shaft of the shaft,
The shaft is characterized in that the molding die is injection-molded in a state in which the flange portion and the projection portion of the reinforcing member inserted in the molding die are sandwiched in the axial direction.

  The shaft of the door mirror device according to the present invention is made of a resin material and is inserted with a cylindrical reinforcing member made of a metal material. The rigidity of the metal material is higher than that of the resin material. For this reason, the shaft of the present invention is reduced in weight as compared with a shaft made of a metal material, and has a higher strength than a shaft made only of a resin material. In addition, since the molding die is injection-molded with the flange portion and the projection portion of the reinforcing member inserted in the molding die sandwiched in the axial direction, the reinforcing member is displaced in the axial direction during molding. Is suppressed. Thereby, the durability of the shaft is improved, the wear resistance is also improved, and the reliability of the door mirror device is improved.

A plurality of through holes penetrating in a direction perpendicular to the axis is provided in the main body portion of the reinforcing member,
The reinforcing member may be held in a non-rotating state with respect to the shaft by the resin material entering the portion of the through hole. When the device main body of the door mirror device rotates, the resistance acts on the shaft, and the reinforcing member may be peeled off. However, when the resin material enters the through hole portion, the reinforcement member can be prevented from being rotated. For this reason, the possibility that the reinforcing member peels is reduced.

  The main body portion of the reinforcing member has a cylindrical shape, and the outer diameter thereof can be the same as the outer diameter of the second shaft portion of the shaft. Thereby, since the rotation surface of the apparatus main-body part of a door mirror apparatus becomes a metal material, the abrasion resistance of a shaft can be improved further.

The shaft has a hollow shape,
The main body portion of the reinforcing member may have a cylindrical shape, and the inner diameter thereof may be the same as the inner diameter of the second shaft portion of the shaft.

  The protrusions have a pin shape, and a plurality of the protrusions can be provided at a predetermined angle in the circumferential direction.

The present invention for solving the above problems
A molding method by injection molding of a shaft according to any one of claims 1 to 5,
An insert step of inserting the reinforcement member into the mold by preventing the reinforcement member from moving in the direction perpendicular to the axis of the mold by supporting the main body of the reinforcement member on the mold;
A clamping step of preventing the reinforcing member from moving in the axial direction of the molding die by sandwiching the flange portion and the protruding portion of the reinforcing member in the axial direction by the closed mold.
An injection process for injecting molten resin into the cavity of the closed mold,
A discharging process of opening the mold and discharging the shaft;
It is characterized by including.

And the main-body part of the said reinforcement member is cylindrical shape,
The reinforcing member is prevented from moving in the direction perpendicular to the axis by inserting the main body of the reinforcing member into a fixed mold among the molds.

The main body of the reinforcing member has a cylindrical shape,
The reinforcement member is prevented from moving in the direction perpendicular to the axis by being inserted in a state where the main body portion is inserted through the movable die of the molding die.

It is a schematic diagram which shows the structure of the door mirror apparatus 100 of a present Example. It is front sectional drawing of the shaft 4 of 1st Example. (A) is a perspective view of the reinforcing member 17, (b) is a front sectional view, and (c) is a bottom view. FIG. 10 is an operation explanatory diagram in a state where a reinforcing member 17 is inserted into the fixed mold 22. It is an operation explanatory view in the state where fixed mold 22 and movable mold 23 were closed. It is an operation explanatory view in the state where fixed mold 22 and movable mold 23 were opened. It is front sectional drawing of the shaft 4 which inserted the reinforcement member 17 in which the through-hole 25 was provided. (A) is front sectional drawing of the shaft 26 of 2nd Example, (b) is a perspective view of the reinforcement member 27. FIG. It is operation | movement explanatory drawing when the shaft 26 is injection-molded. (A) is front sectional drawing of the shaft 32 of 3rd Example, (b) is a perspective view of the reinforcement member 33. FIG. It is operation | movement explanatory drawing when the shaft 32 is injection-molded.

  Embodiments of the present invention will be described below.

  In the present invention, FIG. 1 is a schematic view showing the configuration of the door mirror device 100 of the present embodiment, FIG. 2 is a front sectional view of the shaft 4 of the first embodiment, FIG. 3A is a perspective view of the reinforcing member 17, (B) is a front sectional view, and (c) is a bottom view.

  The shaft 4 of the first embodiment relating to the vehicle door mirror device 100 will be described. As shown in FIG. 2, the shaft 4 has a hollow stepped shape. The shaft 4 includes a first shaft portion 9 having the largest diameter attached to the connecting portion 3, a second shaft portion 11 having a smaller diameter than the first shaft portion 9, and a third shaft having a smaller diameter than the first shaft portion 9. The shaft portion 12 is provided concentrically, and a stepped surface 13 is formed between the first shaft portion 9 and the second shaft portion 11. First to third hollow portions 14, 15, and 16 are provided in the first to third shaft portions 9, 11, and 12, respectively. Hereinafter, the length between the stepped surface 13 and the ceiling surface of the first hollow portion 14 is referred to as “thickness t1 of the first shaft portion”.

  The shaft 4 is injection-molded by inserting a reinforcing member 17. The reinforcing member 17 will be described. The reinforcing member 17 is made of a thin metal plate. As shown in FIGS. 3A to 3C, the reinforcing member 17 extends in a direction perpendicular to the axis (radial direction) from the cylindrical main body 18 and one end of the main body 18 in the axial direction. A disc-shaped flange portion 19 and four protrusion portions 21 protruding in the axial direction from the bottom surface portion 19a of the flange portion 19 (the end surface portion of the flange portion 19 where the main body portion 18 is not provided). I have. The four protrusions 21 are arranged on the same circumference on the bottom surface 19a of the flange 19 with an equal angle (in this case, about 90 degrees). Henceforth, the thickness of the flange part 19 is described as "t2", and the length from the bottom face part 19a of the flange part 19 in each projection part 21 is described as "t3". The length t3 of each protrusion 21 is the same.

  As shown in FIG. 2, the reinforcing member 17 has a main body portion 18 disposed in a portion of the second shaft portion 11 of the shaft 4 and a flange portion 19 of the stepped surface 13 of the first shaft portion 9 of the shaft 4. It is arranged and attached to the part of. That is, the outer peripheral surface of the main body portion 18 of the reinforcing member 17 is flush with the outer peripheral surface of the second shaft portion 11 of the shaft 4, and the upper surface of the flange portion 19 of the reinforcing member 17 is stepped on the shaft 4. It is mounted so that it is flush with the surface. For this reason, the outer diameter d1 of the main body portion 18 of the reinforcing member 17 is equal to the outer diameter D1 of the second shaft portion 11 of the shaft 4 (d1 = D1). Further, the inner diameter d2 of the main body portion 18 is larger than the inner diameter D2 of the second shaft portion 11 of the shaft 4 (d2> D2). Further, the outer diameter d3 of the flange portion 19 is smaller than the outer diameter D3 of the first shaft portion 9 of the shaft 4 (d3 <D3).

  The sum of the thickness t2 of the flange portion 19 and the length t3 of the protrusion portion 21 (the length from the bottom surface portion 19a of the flange portion 19) is equal to the thickness t1 of the first shaft portion 9 (t2 + t3 = t1). . The reason for this will be described later.

  Here, as described above, when the housing 2 of the door mirror device 100 rotates, the load due to the weight of the housing 2 and its peripheral members (the door mirror 1, the bracket 5, the motor 6, etc.) is the first shaft portion of the shaft 4. 9 acts most on the stepped surface 13 and the outer peripheral surface of the second shaft portion 11. If the shaft 4 is made of a resin material, the weight can be reduced, but there is a problem that the connection portion between the first shaft portion 9 and the second shaft portion 11 may be damaged. However, in the case of the shaft 4 of the present embodiment, a reinforcing member 17 made of a metal material is attached to the connection portion between the first and second shaft portions 9 and 11. Since the rigidity of the metal material is higher than that of the resin material, the strength of the connecting portion in the shaft 4 of this embodiment is larger than that of the shaft made of only the resin material. As a result, the weight of the shaft 4 is reduced and the strength is increased. Moreover, since the sliding part of the housing 2 becomes a metal surface, wear resistance is also improved.

  Next, a molding method by injection molding of the shaft 4 of the first embodiment will be described with reference to FIGS. As shown in FIG. 4, the parting lines PL <b> 1 and PL <b> 2 between the fixed mold 22 and the movable mold 23 are provided at substantially the center in the axial direction of the first shaft portion 9 of the shaft 4. When the shaft 4 is injection-molded, the reinforcing member 17 is first inserted (inserted) into the cavity 24 of the fixed mold 22. That is, the main body portion 18 of the reinforcing member 17 is inserted into the second shaft portion molding portion 22a in the cavity 24 of the fixed mold 22 (insert step). The flange portion 19 of the reinforcing member 17 contacts the stepped surface surface forming portion 22 b of the fixed mold 22. Thereby, the reinforcing member 17 is positioned in the direction perpendicular to the axis. In other words, the reinforcing member 17 is prevented from shifting in the direction perpendicular to the axis. In addition, in FIG. 4, the reinforcement member 17 before insert is shown with a dashed-two dotted line.

  As shown in FIGS. 4 and 5, the movable mold 23 moves forward, and the parting line PL <b> 1 of the fixed mold 22 matches the parting line PL <b> 2 of the movable mold 23. At the same time, the distal end portion 23 a of the movable mold 23 comes into contact with the hollow portion molding portion 22 c formed at the innermost portion of the cavity 24 of the fixed mold 22. As described above, the sum of the thickness t2 of the flange portion 19 and the length t3 of the protruding portion 21 in the reinforcing member 17 is equal to the thickness t1 of the first shaft portion 9 of the shaft 4. For this reason, the stepped back surface molding portion 23b of the movable mold 23 comes into contact with the projection portion 21 of the reinforcing member 17 and sandwiches the flange portion 19 and the projection portion 21 of the reinforcing member 17 (a clamping step). Thereby, the reinforcing member 17 is positioned in the axial direction. In other words, the reinforcing member 17 is prevented from shifting in the axial direction.

  In this state, molten resin (not shown) is injected into the cavity 24 (injection process). The molten resin is injected, for example, from runners (not shown) provided on the parting lines PL1 and PL2 between the fixed mold 22 and the movable mold 23. Then, it passes through the gaps between the protrusions 21 of the reinforcing member 17, flows through the space Q between the main body 18 of the reinforcing member 17 and the second hollow portion molding portion 23 c of the movable mold 23, and thus the cavity 24. Filled. After a predetermined time has elapsed, the movable mold 23 is retracted and opened as shown in FIG. And the shaft 4 which inserted the reinforcement member 17 is discharged | emitted (discharge process).

  As shown in FIG. 7, a plurality of through holes 25 may be provided in the body portion 18 of the reinforcing member 17 in the direction perpendicular to the axis. The molten resin that has been injected into the cavity 24 of the fixed mold 22 in which the reinforcing member 17 is inserted and has reached the space Q enters the portion of the through hole 25 and is solidified. Here, in the door mirror device 100, when the housing 2 rotates, the reinforcing member 17 tends to rotate with the rotation of the housing 2. Thereby, there exists a possibility that the reinforcement member 17 may peel from the shaft 4. FIG. However, the molten resin solidified at these through-holes 25 functions as a resistance against follow-up and vibration accompanying the rotation of the housing 2 (for example, vibration during traveling of the vehicle), external force, and the like. Thereby, the possibility that the reinforcing member 17 peels from the shaft 4 is reduced. In addition, since the outer peripheral surface of the main body 18 of the reinforcing member 17 is the same surface (including the portions of the through holes 25), the rotation resistance of the housing 2 is reduced by providing the through holes 25. There is no increase.

  Next, the shaft 26 of the second embodiment will be described. As shown in FIG. 8, the reinforcing member 27 inserted into the shaft 26 includes a cylindrical main body portion 28 and a disk-like flange portion 29 extending in a direction perpendicular to the axis from one axial end portion thereof. And four protrusions 31 protruding in the axial direction from the upper surface of the flange portion 29. In the reinforcing member 27, the portion different from the reinforcing member 17 of the shaft 4 of the first embodiment described above is such that the outer diameter d1 of the main body portion 28 is smaller than the outer diameter D1 of the second shaft portion 11 of the shaft 26 ( d1 <D1) and the protruding direction of each protrusion 31 is reversed.

  As shown in FIG. 9, the reinforcing member 27 is inserted and fitted into the second hollow portion molding portion 23 c of the movable mold 23. Thereby, the reinforcing member 27 is positioned in the direction perpendicular to the axis. In other words, the reinforcing member 27 is prevented from shifting in the direction perpendicular to the axis.

  Further, the sum of the thickness t2 of the flange portion 29 and the length t3 of the protruding portion 31 is equal to the thickness t1 of the first shaft portion 9 of the shaft 26. For this reason, when the fixed mold 22 and the movable mold 23 are closed, the stepped surface front molding part 22b of the fixed mold 22 and the stepped surface back molding part 23b of the movable mold 23 sandwich the reinforcing member 27. Thereby, the reinforcing member 27 is positioned in the axial direction. In other words, the reinforcing member 27 is prevented from shifting in the axial direction.

  Next, the shaft 32 of the third embodiment will be described. As shown in FIG. 10, the reinforcing member 33 inserted into the shaft 32 includes a cylindrical main body portion 34, a flange portion 35 extending in a direction perpendicular to the axis from one axial end portion thereof, and a flange portion. Four projections (an upper projection 36a and a lower projection 36b) projecting in the axial direction from the upper surface and the bottom surface of 35 are provided. In the reinforcing member 33, the portion different from the reinforcing member 17 of the shaft 4 of the first embodiment described above is such that the outer diameter d1 of the main body portion 34 is smaller than the outer diameter D1 of the second shaft portion 11 of the shaft 32, and the main body portion 34. The inner diameter d2 of the shaft 26 is larger than the inner diameter D2 of the second shaft portion 11 of the shaft 26 (d1 <D1, d2> D2), and the upper and lower protrusions 36a, 36b are protruded vertically from the flange portion 35. is there.

  Even if the reinforcing member 33 is fitted to the second shaft portion molding portion 22a of the fixed mold 22, or is inserted into the second hollow portion molding portion 23c of the movable die 23, The outer peripheral surface of the main body portion 34 of the reinforcing member 33 and the inner peripheral surface of the fixed die 22 (second shaft portion molding portion 22a) or the inner peripheral surface of the main body portion 34 and the outer peripheral surface of the movable die 23 (second hollow portion molding portion 23c). )), It is difficult to position the reinforcing member 33 in the direction perpendicular to the axis. For this reason, as shown in FIG. 11, insertion holes 37 for inserting the respective lower protrusions 36 b of the reinforcing member 33 are provided in the stepped surface back molding portion 23 b of the movable mold 23. The reinforcing member 33 is positioned in the direction perpendicular to the axis by inserting each lower protrusion 36 b into the corresponding insertion hole 37 of the movable mold 23.

  The sum of the thickness t2 of the flange portion 35 and the lengths t3a and t3b of the upper and lower protrusions 36a and 36b is the sum of the thickness t3 of the first shaft portion 9 of the shaft 32 and the depth t4 of the insertion hole 46. Equal (t2 + t3a + t3b = t1 + t4). For this reason, when the fixed mold 22 and the movable mold 23 are closed, the stepped surface surface forming portion 22 b of the fixed mold 22 and the insertion hole 39 of the movable mold 23 sandwich the reinforcing member 33. Thereby, the reinforcing member 33 is positioned in the axial direction. In other words, the reinforcing member 27 is prevented from shifting in the axial direction.

  In the case of the shaft 32 of the third embodiment, the lower protrusion 36b of the reinforcing member 33 enters the insertion hole 46 of the movable mold 23 by its own weight, whereby the reinforcing member 33 is positioned in the direction perpendicular to the axis. For this reason, it is desirable to arrange the axes (not shown) of the fixed mold 22 and the movable mold 23 along the height direction.

  Even in the case of the shafts 26 and 32 of the second and third embodiments, the through holes are formed in the main body portions 28 and 34 of the reinforcing members 27 and 33 like the reinforcing member 17 of the shaft 4 of the first embodiment. 25 may be provided so that the reinforcing members 27 and 33 can be prevented from being peeled off (see FIG. 7).

  The flange portions 19, 29, and 35 of the reinforcing members 17, 27, and 33 of the shafts 4, 26, and 32 in each of the above embodiments have a disk shape. However, it may be a polygonal shape provided that it is inserted into the first shaft portion 9 of the shafts 4, 26, 32.

  The shafts 4, 26, and 32 of the present embodiment can be reduced in overall weight by being used in an electrically retractable door mirror device. However, it may be used for a manually retractable door mirror device.

  The shaft according to the present invention can be used for a door mirror device of a vehicle.

1 Door mirror 2 Housing (unit body)
4, 26, 32 Shaft 9 First shaft portion 11 Second shaft portion 17, 27, 33 Reinforcing members 18, 28, 34 Body portions 19, 29, 35 Flange portions 21, 31, 36a, 36b Protruding portion 22 Fixed type ( Mold)
23 Movable mold (molding mold)
25 Through-hole 100 Door mirror device CL Axis d1 Outer diameter d2 of main part of reinforcing member D1 Inner diameter of main part of reinforcing member D1 Outer diameter of second shaft part of shaft D2 Inner diameter t2 of second shaft part of shaft Thickness t2 Flange thickness t3 Protrusion axial length t4 Depth

Claims (9)

A device body for storing the door mirror is rotated around the axis of the shaft, whereby the device body is a door mirror device arranged in either the unfolded state or the retracted state,
The shaft is formed by injection molding a resin material, and supports a first shaft portion that supports the weight of the device main body portion, and the device main body portion so as to be rotatable. The shaft is perpendicular to the first shaft portion. A stepped shape having a second shaft portion having a small cross-sectional area;
The shaft is made of a metal material, and has a cylindrical main body, a flange extending in a direction perpendicular to the axis from the outer peripheral surface of one axial end of the main body, and an axial projection from the flange. A reinforcing member having a protruding portion is insert-molded across the first shaft portion and the second shaft portion,
The sum of the axial length of the protrusion and the thickness of the flange is the same as or longer than the thickness of the first shaft of the shaft,
The door mirror device according to claim 1, wherein the shaft is injection-molded with a molding die sandwiched in the axial direction between a flange portion and a projection portion of the reinforcing member inserted into the molding die. A plurality of through holes penetrating in a direction perpendicular to the axis is provided in the main body portion of the reinforcing member,
The door mirror device according to claim 1, wherein the reinforcing member is held in a non-rotating state with respect to the shaft by a resin material entering the portion of the through hole.   The door mirror device according to claim 1 or 2, wherein the main body portion of the reinforcing member has a cylindrical shape, and an outer diameter thereof is the same as an outer diameter of the second shaft portion of the shaft. The shaft has a hollow shape;
The door mirror device according to claim 1 or 2, wherein the main body portion of the reinforcing member has a cylindrical shape, and an inner diameter thereof is the same as an inner diameter of the second shaft portion of the shaft.   The door mirror device according to any one of claims 1 to 4, wherein the protrusion has a pin shape, and a plurality of the protrusions are provided at a predetermined angle in the circumferential direction. A molding method by injection molding of a shaft according to any one of claims 1 to 5,
An insert step of inserting the reinforcement member into the mold by preventing the reinforcement member from moving in the direction perpendicular to the axis of the mold by supporting the main body of the reinforcement member on the mold;
A clamping step of preventing the reinforcing member from moving in the axial direction of the molding die by sandwiching the flange portion and the protruding portion of the reinforcing member in the axial direction by the closed mold.
An injection process for injecting molten resin into the cavity of the closed mold,
A discharging process of opening the mold and discharging the shaft;
A method for forming a shaft of a door mirror device, comprising: The main body of the reinforcing member has a cylindrical shape,
The shaft of the door mirror device according to claim 6, wherein the reinforcing member is prevented from moving in a direction perpendicular to the axis when the main body portion is inserted into a fixed die of a molding die. Molding method. The main body of the reinforcing member has a cylindrical shape,
The door mirror device according to claim 6, wherein the reinforcing member is prevented from moving in a direction perpendicular to the axis by being inserted in a state where the main body portion is inserted into a movable die of the molding die. Shaft forming method. The movable mold of the mold is provided with a hole for inserting the protrusion of the reinforcing member,
The method of forming a shaft of a door mirror device according to claim 6, wherein the reinforcing member is prevented from moving in a direction perpendicular to the axis by inserting a protrusion of the reinforcing member into the hole.

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