JP2010106858A - Pivot device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pivot device and its manufacturing method, capable of reliably improving the position holding force of a body to be supported relative to an object to be mounted. <P>SOLUTION: The pivot device 2 includes a pivot 8 in which a head 10, a shaft 11 and a mounting section 12 are integrally provided in a linked manner, and a holder 9 in which the head 10 of the pivot 8 is held on the spherical seat 7 of a mirror assembly 3 in a pressed-down state. The holder 9 is formed of a doughnut-like disc member having a closed cross sectional structure closing in a direction which surrounds the shaft 11 of the pivot 8. The pivot device 2 is manufactured by a manufacturing method having a process for assembling a fixed die 21 and a divided movable die 24 which form a cavity 25 corresponding to the holder 9 relative to the pivot 8 manufactured through preliminary injection molding, and a process for injecting a molten resin material 27 into the cavity 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pivot device for tiltably supporting a mirror assembly with respect to a vehicle, for example, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, there is one in which a mirror assembly is attached to a vehicle via a pivot device (see, for example, Patent Document 1). Since the mirror assembly can be tilted by using the pivot device, an appropriate mirror angle can be easily obtained.

JP 2005-59775 A

  FIG. 6 is a side view for explaining a support structure of a mirror assembly using a conventional pivot device. FIG. 6A is an enlarged cross-sectional view of an X part in FIG. 6A and FIG. Each figure (c) is shown.

  In the mirror assembly support structure shown in FIG. 6, a mirror assembly 53 is attached via a pivot device 52 to a mirror attachment stay 51 provided in a vehicle (not shown).

The mirror assembly 53 includes a housing 54 and a mirror 55 assembled on the front side of the housing 54.
A bottomed round hole 56 is provided at the center of the back surface of the housing 54, and a spherical seat 57 is formed at the center of the bottom surface of the round hole 56.

The pivot device 52 includes a pivot 58 and a holder 59.
The pivot 58 includes a spherical head 60 slidably contacting the spherical seat 57, a shaft portion 61 integrally connected to the head 60, and a shaft portion 61 integrally connected to the shaft portion 61. The mounting part 62 is comprised.
The holder 59 has a contour shape that fits into the round hole 56 with a slight gap. In the holder 59, the center portion is cut out in a circular shape having a larger diameter than the shaft portion 61 to form a circular cut-out portion 63, and the circular cut-out portion 63 outwards from the circular cut-out portion 63. An opening 64 is formed by cutting out a part.

The opening 64 is sized to receive the shaft portion 61, and the holder 59 can be inserted into and removed from the shaft portion 61 through the opening 64 with play.
The circular punched portion 63 is formed with a spherical pressing surface 65 for pressing the head 60, and contacts the shaft portion 61 when the mirror assembly 53 is inclined at a predetermined angle with respect to the pivot 58. A conical stopper surface 66 that restricts the tilt is formed.

In this pivot device 52, a required screw 67 penetrating the holder 59 is screwed into the bottom of the round hole 56, whereby the head 60 is sandwiched between the pressing surface 65 and the spherical seat 57, and the head 60 is spherical. The seat 57 can be held in a pressed state.
The holding force of the holder 59 is increased or decreased by increasing or decreasing the screwing amount of the screw 67, respectively. That is, the screw 67 functions as a holding force increasing / decreasing means that increases or decreases the holding force of the holder 59.
The pivot device 52 is provided with a pressing member 68 that engages with the mounting portion 62 with the mirror mounting stay 51 interposed therebetween, and a required cap bolt 69 that penetrates the pressing member 68 is attached to the mounting portion 62. By screwing, the mounting portion 62 and the pressing member 68 firmly clamp the mirror mounting stay 51, and the mounting portion 62 is fixed to the mirror mounting stay 51.

  For example, when a mirror assembly 53 is mounted on a construction vehicle such as a hydraulic excavator that is often used under harsh working conditions, the mirror angle of the mirror assembly 53 changes unexpectedly due to vehicle vibration during traveling or working. There is a fear. In order to prevent such a situation, it is necessary to increase the posture holding force of the mirror assembly 53. As one effective means for increasing this posture holding force, the screw 67 can be screwed in to increase the holder. There is a method of increasing the sliding torque between the head 60 and the spherical seat 57 by increasing the holding force of 59.

By the way, since the opening part 64 is provided in the holder 59, it can be said that the holder 59 has an open sectional structure in which a part in the direction surrounding the shaft part 61 is interrupted.
For this reason, a part of the pressing force acting on the head 60 from the pressing surface 65 is converted into an expanding force that expands the opening 64 in the direction indicated by the white arrow in FIG. The opening 64 is expanded by force.
Therefore, in the conventional pivot device 52, even if the screwing amount of the screw 67 is increased in order to increase the sliding torque, the opening 64 spreads and the pressing force acting on the head 60 from the pressing surface 65 is increased. As a result, the sliding torque cannot be increased as expected, and the posture holding force of the mirror assembly 53 cannot be reliably increased.
By opening the fitting of the holder 67 with the round hole 56, that is, by reducing the clearance between the inner diameter dimension of the round hole 56 and the outer dimension of the holder 59, the opening 64 expands as the screw 67 is screwed. However, if the fit of the holder 59 to the round hole 56 is tightened, a new problem that the assemblability deteriorates is caused.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a pivot device and a method for manufacturing the same that can reliably increase the posture holding force of the supported body with respect to the attachment target. It is.

In order to achieve the above object, the pivot device according to the first invention comprises:
A spherical head that is slidably in contact with a spherical seat formed on the supported body, a shaft portion that is integrally connected to the head portion, and a shaft portion that is integrally connected to the shaft portion and is to be attached A pivot composed of a mounting portion fixed to the object, and
A holder having a pressing surface for pressing the head of the pivot, and holding the pivot head in a pressed state against the spherical seat of the supported body;
In a pivot device comprising a holding force increasing / decreasing means for increasing or decreasing the holding force of the holder,
The holder is constituted by a closed cross-section member closed in a direction surrounding the shaft portion of the pivot.

  1st invention WHEREIN: The said to-be-supported body is a mirror assembly comprised from the housing which has the said spherical seat on the back side, and the mirror assembled | attached to the front side of this housing, The said mounting target object is provided in a vehicle. The mirror mounting stay can be provided (second invention).

Next, a manufacturing method of the pivot device according to the third invention is as follows.
A method of manufacturing a pivot device according to the first invention,
Assembling a mold for forming a cavity corresponding to the holder with respect to the pivot produced in advance by injection molding;
And a step of injecting a molten resin material into the cavity.

  According to the pivot device of the present invention, since the holder is formed of a closed cross-section member that is closed in a direction surrounding the pivot shaft, all of the pressing force from the pressing surface of the holder is applied to the pivot head. be able to. Therefore, by increasing the holding force of the holder by operating the holding force increasing / decreasing means, the sliding torque between the pivot head and the spherical seat of the housing is increased in accordance with the increase of the holding force of the holder. Therefore, the posture holding force of the supported body with respect to the attachment object can be reliably increased.

  Moreover, according to the manufacturing method of the pivot apparatus of this invention, the pivot apparatus unitized by combining the pivot and the holder comprised with a closed cross-section member can be obtained easily.

  Next, specific embodiments of the pivot device and the manufacturing method thereof according to the present invention will be described with reference to the drawings.

  FIG. 1 is a side view for explaining a structure for supporting a mirror assembly using a pivot device according to an embodiment of the present invention. FIG. The BB arrow line view (c) of each is shown.

In the mirror assembly support structure shown in FIG. 1, a mirror assembly 3 is attached via a pivot device 2 to a mirror mounting stay 1 provided in a construction vehicle (not shown) such as a hydraulic excavator.
The mirror mounting stay 1 corresponds to an “attachment object” of the present invention, and the mirror assembly 3 corresponds to a “supported body” of the present invention.

The mirror assembly 3 includes a housing 4 and a mirror 5 assembled on the front side of the housing 4.
A bottomed round hole 6 is provided at the center of the back surface of the housing 4, and a spherical seat 7 is formed at the center of the bottom surface of the round hole 6.

The pivot device 2 includes a pivot 8 and a holder 9.
The pivot 8 and the holder 9 are both made of a resin material, and the same kind of resin material may be used, or different resin materials may be used.
The type of resin material used is not particularly limited. For example, 6-nylon or 6,6-nylon is preferable, and glass fiber is preferably mixed with 6-nylon or 6,6-nylon. A reinforced resin material with increased strength is used.

The pivot 8 has a spherical head 10 that is slidably in contact with the spherical seat 7, a shaft portion 11 that is integrally connected to the head portion 10, and a shaft portion 11 that is integrally connected to the shaft portion 11. The mounting part 12 is comprised.
The holder 9 is composed of a donut disk-shaped member having a closed cross-sectional structure closed in a direction surrounding the shaft portion 11, and is set to have an outer diameter dimension that fits into the round hole 6 with a slight gap. A round hole portion 13 having an inner diameter larger than the outer diameter of the shaft portion 11 is formed at the center portion of the holder 9.
Note that the constituent member of the holder 9 is not limited to a donut disk-shaped member. For example, the holder 9 has a closed cross-sectional structure that has a hole portion corresponding to the round hole portion 13 and is closed in a direction surrounding the shaft portion 11. Polygonal plate members may be used.

  The round hole portion 13 is formed with a spherical pressing surface 15 for pressing the head portion 10, and when the mirror assembly 3 is inclined at a predetermined angle with respect to the pivot 8, it contacts the shaft portion 11 and further. A conical stopper surface 16 that restricts tilting is formed.

In this pivot device 2, a required screw 17 penetrating the holder 9 is screwed into the bottom of the round hole 6, whereby the head 10 is sandwiched between the pressing surface 15 and the spherical seat 7 so that the head 10 is spherical. The seat 7 can be held in a pressed state.
The holding force of the holder 9 is increased or decreased by increasing or decreasing the screwing amount of the screw 17, respectively. That is, the screw 17 functions as holding force increasing / decreasing means for increasing / decreasing the holding force of the holder 9.
Further, in this pivot device 2, a pressing member 18 that engages with the mounting portion 12 with the mirror mounting stay 1 being sandwiched is provided, and a required cap bolt 19 that penetrates the pressing member 18 is attached to the mounting portion 12. By screwing, the mounting portion 12 and the pressing member 18 firmly clamp the mirror mounting stay 1 so that the mounting portion 12 is fixed to the mirror mounting stay 1.

According to the pivot device 2 configured as described above, since the holder 9 is configured by a donut disk-shaped member having a closed cross-sectional structure closed in a direction surrounding the shaft portion 11, the pressing force from the pressing surface 15 All can be applied to the head 10. Therefore, by increasing the holding force of the holder 9 by screw tightening operation that increases the screwing amount of the screw 17, the sliding torque between the head 10 and the spherical seat 7 is increased. Therefore, the attitude holding force of the mirror assembly 3 with respect to the mirror mounting stay 1 can be reliably increased.
In addition, since the entire sliding portion between the head 10 and the spherical seat 7 is covered with the holder 9, foreign matter such as dust can be prevented from entering the sliding portion.
Furthermore, there is an advantage that the shape is simple and the appearance is good as compared with the conventional holder 59 provided with the opening 64.

  Next, a schematic configuration of the pivot device manufacturing machine 20 that manufactures the pivot device 2 will be described below with reference to FIGS. 2 and 3.

  As shown in FIG. 3, the pivot device manufacturing machine 20 has a fixed mold 21 having a recessed portion 21 a into which approximately half of the tip end side of the head 10 in the pivot 8 is fitted, and is disposed so as to face the fixed mold 21. And a pivot holding member 23 for holding the posture of the pivot 8 with respect to the fixed mold 21 in a state where the head 10 is fitted in the recess 21a.

As shown in FIG. 2, the movable mold 22 is divided into three divided movable molds arranged 120 degrees out of phase around the axial center point O of the pivot 8 that is pressed against the fixed mold 21. 24.
Each split movable mold 24 are not shown cam or link, by driving the movable die drive unit composed of an actuator or the like, along a trajectory line indicated by a one-dot chain line symbol L _K is attached in FIG molding A reciprocating movement is made between the position and the retracted position.
By reciprocating between a molding position and a retracted position each of the divided movable mold 24 along the locus line L _K, each of the divided movable mold 24, the pivot 8 and the molded article (holder 9), a pivot holding member It is possible to advance and retreat with respect to the fixed mold 21 without interfering with 23 or the like.

Here, the molding position of the split movable mold 24 means that the holder 9, which is a molded product, just fits between the fixed mold 21 and the head 10 of the pivot 8 that is pressed against and held by the fixed mold 21. 3 is a state position indicated by a solid line in FIG. 3 forming a space 25 (hereinafter referred to as “cavity 25”).
On the other hand, the retracted position of the split movable mold 24 is a state position indicated by a two-dot chain line in FIG. 3 that does not hinder the removal of the pivot device 2 after the holder 9 is molded.

  The manufacture of the pivot device 2 by the pivot device manufacturing machine 20 will be described with reference to the manufacturing process explanatory diagrams of FIGS.

First, as shown in FIG. 4A, in a state where each of the split movable dies 24 is positioned at the retracted position, the pivot 8 that has been prepared in advance by injection molding is fixed to the fixed die 21 and the pivot. It sets so that the head 10 may be hold | maintained between the members 23 in the state fitted in the hollow part 21a.
Next, as shown in FIG. 4B, each split movable mold 24 is moved to the molding position, and the injection nozzle 26 is connected to the molten resin injection port 21 b formed in the fixed mold 21.
Then, as shown in FIG. 5A, a molten resin material 27 is injected from the injection nozzle 26 toward the cavity 25. At this time, a temperature condition when the resin material 27 is injected into the cavity 25 so that a part of the head 10 is melted by the injected resin material 27 and the resin material 27 and the head 10 are not melt-fixed. Control pressure conditions.
After the injected resin material 27 is solidified, as shown in FIG. 5B, each split movable mold 24 is moved to the retracted position, and the holding state of the pivot 8 on the fixed mold 21 is released. Then, the pivot device 2 in which the holder 9 is formed around the pivot 8 is taken out.
By the way, the holder 9 which is a molded product may be in close contact with the head 10 due to a shrinking action or the like when the resin material 27 injected into the cavity 25 is solidified. In such a case, a separation step of separating the head 10 and the holder 9 in close contact with each other by applying an impact to the holder 9 with a hammer or the like is performed.

According to the manufacturing method of the pivot device 2 using the pivot device manufacturing machine 20, it is possible to easily obtain the unitized pivot device 2 by combining the holder 9 and the pivot 8 formed of the closed cross-section member. .
The unitized pivot device 2 has the advantage that it is possible to improve the assemblability with respect to the mirror assembly 3 and to reduce the number of managed components, thereby facilitating component management.

  As mentioned above, although the pivot apparatus of this invention and its manufacturing method were demonstrated based on one embodiment, this invention is not limited to the structure described in the said embodiment, In the range which does not deviate from the meaning, the The configuration can be changed.

  Since the pivot device of the present invention has a characteristic that the posture holding force of the supported body with respect to the attachment target can be reliably increased, it serves as a support device that supports the mirror assembly in a tiltable manner with respect to the vehicle. In addition to being suitable for use, it can also be used as a support device that supports a surveillance camera that monitors the surroundings of the vehicle so as to be tiltable with respect to the vehicle.

The side view (a) explaining the support structure of the mirror assembly using the pivot device concerning one embodiment of the present invention, the A section expanded principal part sectional view (b) of (a), and the BB arrow of (a) Visual view (c) Front view of pivot device manufacturing machine CC sectional view of FIG. Manufacturing process explanatory diagram of pivot device (1) Manufacturing process explanatory diagram of pivot device (2) Side view (a) for explaining a support structure of a mirror assembly using a conventional pivot device, (a) X-part enlarged cross-sectional view (b), and (a) view along arrow YY (c)

Explanation of symbols

1 Mirror mounting stay (mounting object)
2 Pivot device 3 Mirror assembly (supported body)
4 Housing 5 Mirror 7 Spherical Seat 8 Pivot 9 Holder 10 Head 11 Shaft 12 Mounting Portion 15 Pressing Surface 17 Screw (Retention Force Increasing / Reducing Means)
20 Pivot device manufacturing machine 21 Fixed mold 22 Movable mold 24 Split movable mold 25 Cavity 27 Resin material

Claims (3)

A spherical head that is slidably in contact with a spherical seat formed on the supported body, a shaft portion that is integrally connected to the head portion, and a shaft portion that is integrally connected to the shaft portion and is to be attached A pivot composed of a mounting portion fixed to the object, and
A holder having a pressing surface for pressing the head of the pivot, and holding the pivot head in a pressed state against the spherical seat of the supported body;
In a pivot device comprising a holding force increasing / decreasing means for increasing or decreasing the holding force of the holder,
A pivot device characterized in that the holder is formed of a closed cross-section member closed in a direction surrounding the shaft portion of the pivot. The supported body is a mirror assembly composed of a housing having the spherical seat on the back side and a mirror assembled on the front side of the housing;
The pivot device according to claim 1, wherein the attachment object is a stay for attaching a mirror provided in a vehicle. It is a manufacturing method of the pivot apparatus according to claim 1,
Assembling a mold for forming a cavity corresponding to the holder with respect to the pivot produced in advance by injection molding;
And a step of injecting a molten resin material into the cavity.

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