JP4251971B2 - Automotive electronics - Google Patents

Description

  The present invention relates to an in-vehicle electronic device in which a movable panel having a display screen is rotated in front of a device body by a driving force of a motor.

  Conventionally, as an example of this type of in-vehicle electronic device, a slide member is disposed inside the device body so as to be movable in the front-rear direction, and a movable panel is rotatably supported at the front end of the slide member, There is known one in which a movable panel is rotated in a standing posture in front of a device main body during use (see, for example, Patent Document 1). The movable panel is provided with a display screen such as a liquid crystal display, and this display screen faces the user (passenger) when the movable panel is in a standing posture. A winding portion of a torsion coil spring is mounted on a connecting shaft that connects the slide member and the movable panel, and both ends of the torsion coil spring are locked to the slide member and the movable panel.

In such an in-vehicle electronic device, there are known a 1-motor system in which the slide member and the movable panel are driven by a common motor, and a 2-motor system in which both are driven by separate motors. When employed, when the slide member is retracted to the retracted position in the device main body, the movable panel is stored in the device main body while maintaining a horizontal posture and is in a closed state. When the first motor is rotated in one direction in this closed state, the slide member starts to move from the retracted position to the advanced position, and after the slide member has moved to the advanced position, or immediately before, the second motor is moved in one direction. When it rotates, the movable panel rotates in front of the device body and stands up at a predetermined inclination angle. At this time, the opening angle of both ends of the torsion coil spring is gradually narrowed as the movable panel rotates, and a large elastic force is stored in the torsion coil spring in the open state in which the movable panel stands up at a predetermined inclination angle. Therefore, rattling of the movable panel in the standing posture is prevented by the reaction force. On the other hand, when the second motor is rotated in the reverse direction in such an open state, the movable panel rotates in front of the device body and returns from the standing posture to the horizontal posture, and accordingly, the elastic force of the torsion coil spring gradually increases. It gets smaller. Then, after the movable panel returns to the horizontal posture or immediately before the first motor is rotated in the reverse direction, the slide member starts to move from the forward movement position to the backward movement position and is drawn into the device main body. It is stored in the device main body while maintaining the horizontal posture again.
JP 2000-344020 A (page 3-5, FIG. 5)

In the above-described conventional in-vehicle electronic device, since the torsion coil spring is used to prevent the movable panel in the standing posture from shaking, the movable panel is rotated from the horizontal posture to the standing posture by using the motor as a driving source. When moving, both the weight of the movable panel and the force to bend the torsion coil spring act in the opposite direction with respect to the rotational direction of the movable panel, and the motor receives a large load in the rotational direction at a low speed. Rotate. However, when the movable panel in the standing posture is rotated to the horizontal posture, the return force of the torsion coil spring acts in the same direction as the rotation direction of the motor. Assisted by the restoring force of the coil spring reduces the load on the motor, and thus increases the rotational speed of the motor. That is, the operation load of the motor greatly varies depending on the rotation direction of the movable panel . If the motor load becomes extremely small during the rotation of the movable panel in this way, the gears of the reduction gear train that transmits the rotational force of the motor to the movable panel collide with each other by backlash, or the rotation shaft of the motor is thrust. There was a problem that abnormal noise was generated due to rattling in the direction.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide an in-vehicle electronic device that can suppress the generation of abnormal noise from a power transmission system that rotates a movable panel using a motor as a drive source. To provide equipment.

The present invention includes a torsion coil spring whose elastic force fluctuates in accordance with the rotation angle of the movable panel, and prevents the rattling of the movable nose in the standing posture by using the elastic force of the torsion coil spring. In such an in-vehicle electronic device, when the movable panel is rotated in front of the device body using the motor as a drive source, the frictional resistance generated between the cam body and the spring member according to the rotation angle of the movable panel is reduced. the Rukoto varied by the elastic force opposite relationship torsion coil spring, and so as to reduce the generation of noise due to the operation load change sudden motor.

The present invention includes a torsion coil spring whose elastic force fluctuates in accordance with the rotation angle of the movable panel, and prevents the rattling of the movable nose in the standing posture by using the elastic force of the torsion coil spring. The vehicle-mounted electronic device thus configured includes a cam body that rotates in conjunction with a motor that rotates the movable panel, and a spring member that elastically contacts the cam body, and these cams depend on the rotation angle of the movable panel. Since the frictional resistance generated between the body and the spring member fluctuates in the opposite relation to the elastic force of the torsion coil spring , the motor load becomes extremely small during the rotation of the movable panel (rotation angle Range) and noise generation from the power transmission system can be suppressed.

The present invention includes a movable panel having a display screen, and a torsion coil spring that varies a resilience according to a rotation angle of the movable panel that rotates the movable panel in front of a device body, In the in-vehicle electronic device set so that the elastic force of the torsion coil spring gradually increases when the motor rotates from the horizontal posture toward the standing posture, and a cam body that rotates in conjunction with the motor, and a spring member elastically contacting the cam member, in accordance with the rotation angle of the movable panel, in frictional resistance is reversed and the resilient force of the torsion coil spring relationship occurring between the spring member and the cam member It was configured to change.

In the in-vehicle electronic device configured as described above , the cam body is provided with the return force of the torsion coil spring acting in the same direction as the rotation direction of the motor during the closing operation in which the movable panel rotates from the standing posture to the horizontal posture. Since the frictional resistance generated between the motor and the spring member gradually increases, by adding this frictional resistance to the operating load as an additional load, the region where the motor load torque becomes extremely small can be eliminated, and the movable panel can be rotated. Abnormal noise generation from the moving power transmission system can be suppressed.

  In the above configuration, the cam body may be installed in any part of the power transmission system from the motor to the movable panel, but the movable panel is of a type that supports the movable panel in a rotatable manner at the front end of a base such as a slide member. In the case of an in-vehicle electronic device, it is preferable that the cam body is integrally provided at the lower end portion of the movable panel, the portion including the cam body of the movable panel is rotatably supported on the base, and a spring member is attached to the base. .

An embodiment will be described with reference to the drawings. FIG. 1 is a side view of an in-vehicle electronic device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing a main part of the in-vehicle electronic device, and FIG. It is operation | movement explanatory drawing of the cam body and leaf | plate spring with which an in-vehicle electronic device is equipped.

  As shown in FIG. 1, the in-vehicle electronic device according to the present embodiment includes a box-shaped device main body 1, and the device main body 1 is located in a vehicle obliquely below the line of sight of the user (passenger). Are installed in appropriate locations, for example, in the recesses of the instrument panel. A slide member (base body) 2 is disposed inside the device main body 1, and the slide member 2 is moved in the front-rear direction of the device main body 1 by a first power transmission mechanism using a first motor (not shown) as a drive source. Is moved back and forth. A movable panel 3 is rotatably supported at the front end portion of the slide member 2, and a display screen 4 including a liquid crystal display (LCD) and operation buttons (not shown) are arranged on the lower surface of the movable panel 3. It is installed. The movable panel 3 is operated by a second power transmission mechanism 6 using a second motor 5 mounted on the slide member 2 as a drive source, and has a horizontal posture indicated by a solid line and a standing posture indicated by a two-dot chain line in FIG. Rotate between. The second power transmission mechanism 6 has a reduction gear train, and the worm gear 6a, which is the first gear of the reduction gear train, is attached to the rotating shaft of the second motor 5, and the final gear 6b is Fixed to the movable panel 3.

  As shown in FIG. 2, a notch 3a is formed on one lower side surface of the movable panel 3, and a cam body 7 having a shaft hole 7a is provided on the inner surface of the notch 3a. The cam body 7 is fixed to the movable panel 3, but may be formed integrally with an exterior case of the movable panel 3. The outer peripheral surface of the cam body 7 has a cam shape in which the diameter from the shaft hole 7 a changes along the circumferential direction, and the connecting pin 8 inserted through the side surface of the slide member 2 is connected to the shaft hole 7 a of the cam body 7. The movable panel 3 is rotated about the connecting pin 8 by being inserted into. Although not shown, the other lower side surface of the movable panel 3 is also connected to the side surface of the slide member 2 by a connecting pin, and a winding portion of a torsion coil spring is attached to the connecting pin, and the torsion coil spring is also mounted. By urging both ends to the slide member 2 and the movable panel 3, an urging force is applied to the movable panel 3 from the torsion coil spring in the horizontal posture direction (counterclockwise direction in FIG. 1). A leaf spring 9 bent in an L shape is fixed to the front end portion of the slide member 2, and an upright portion 9 a of the leaf spring 9 faces the outer peripheral surface of the cam body 7. The relative positions of the outer peripheral surface of the cam body 7 and the leaf spring 9 are changed by the rotation of the movable panel 3, and when the movable panel 3 is in the horizontal posture as shown in FIG. The portion 9a is greatly bent in contact with the maximum diameter portion of the cam body 7. When the movable panel 3 is rotated from the horizontal posture to the standing posture, the cam body 7 rotates in the direction of arrow A while sliding the outer peripheral surface of the movable body 3 to the upright portion 9a. As shown in FIG. 3B, when the movable panel 3 is rotated to the standing posture, the standing portion 9a of the leaf spring 9 is It comes into contact with the smallest diameter portion of the cam body 7 and returns to the L shape. On the contrary, when the movable panel 3 rotates from the standing posture to the horizontal posture, the cam body 7 rotates in the direction of arrow B in FIG. As shown in FIG. 3A, when the movable panel 3 is rotated to the horizontal posture, the rising portion 9a of the leaf spring 9 is The cam body 7 is greatly bent in contact with the maximum diameter portion.

  In the in-vehicle electronic device configured as described above, when the slide member 2 is pulled into the retracted position in the device main body 1, the movable panel 3 is stored in the device main body 1 in a closed state while maintaining a horizontal posture. It has become. When the first motor (not shown) is rotated in one direction in this closed state, the slide member 2 starts to move from the retracted position to the advanced position, and the slide member 2 reaches its forward position where the front end protrudes from the device body 1. Move (see FIG. 1). When the second motor 5 is rotated in one direction after the slide member 2 has moved to the forward position or immediately before, the driving force of the second motor 5 is transmitted through the second power transmission mechanism 6 to the final stage. Since it is transmitted to the gear 6b, the movable panel 3 starts to rotate in front of the device body 1, and the movable panel 3 rises from a horizontal posture to a predetermined inclination angle and is in an open state. When the movable panel 3 is opened, the opening angle at both ends of the torsion coil spring (not shown) is gradually narrowed, so that a large elastic force is stored in the torsion coil spring as the movable panel 3 approaches the standing posture. The movable panel 3 is prevented from rattling in the standing posture by the reaction force.

  On the other hand, when the second motor 5 is rotated in the reverse direction while the movable panel 3 is in the open state, the movable panel 3 is rotated in the reverse direction to the front of the device body 1, and the movable panel 3 is moved from the standing posture. Return to the horizontal position and close. During the closing operation of the movable panel 3, the return force of the torsion coil spring acts in the same direction as the rotational direction of the movable panel 3, and simultaneously the component force due to the weight of the movable panel 3 itself acts in the same direction. 3 is assisted by these forces to return to a horizontal posture. Then, after the movable panel 3 returns to the horizontal posture or immediately before the first motor is rotated in the reverse direction, the slide member 2 starts to move from the forward movement position to the backward movement position and is drawn into the apparatus main body 1. The movable panel 3 is stored in the apparatus main body 1 while maintaining the horizontal posture again.

  FIG. 4 is an explanatory diagram showing the relationship between the rotation angle of the movable panel 3 and the load torque of the second motor 5. In the figure, P1 is an operating load when the cam body 7 and the leaf spring 9 are not used, and P2. Denotes an additional load due to frictional resistance generated between the cam body 7 and the leaf spring 9, and P denotes an actual operating load obtained by synthesizing the operating load P1 and the additional load P2.

  As indicated by P1 in FIG. 4, when the movable panel 3 is rotated from the standing posture (open state) to the horizontal posture (closed state) without using the cam body 7 and the leaf spring 9, the movable panel 3 is shown. Since the return to the horizontal position is assisted by the return force of the coiled torsion coil spring, the movable panel 3 is set to the horizontal position by being assisted by the force to return obliquely downward due to the weight of the movable panel 3 and the return force of the torsion coil spring. On the near side, the load torque of the second motor 5 may become negative (region indicated by hatching in the figure). On the other hand, since the cam body 7 and the leaf spring 9 are used in this embodiment, when the movable panel 3 is rotated from the standing posture to the horizontal posture, the cam body 7 is changed from the state shown in FIG. Rotating to the state of a), the frictional resistance generated between the outer peripheral surface of the cam body 7 and the standing portion 9a of the leaf spring 9 gradually increases. That is, as indicated by P2 in FIG. 4, the frictional resistance generated between the cam body 7 and the leaf spring 9 increases as the movable panel 3 approaches the horizontal posture, and this frictional resistance is added to the operating load P1 as an additional load P2. If it adds, as shown by P in FIG. 4, the load torque of the 2nd motor 5 will become large irrespective of the rotation angle of the movable panel 3. FIG.

Thus, in the in-vehicle electronic device according to the present embodiment, the cam body 7 is integrally provided at the rotation center portion of the movable panel 3, and the leaf spring 9 elastically contacting the cam body 7 is attached to the slide member 2. Since the frictional resistance generated between the cam body 7 and the leaf spring 9 is increased in the region where the inclination angle of the movable panel 3 is close to the horizontal posture, the movable panel 3 is moved from the standing posture (open state) to the horizontal posture (closed). When turning to the state), the frictional resistance generated between the cam body 7 and the leaf spring 9 is added to the operating load as an additional load, thereby eliminating the region where the load torque of the second motor 5 becomes extremely small. . As a result, the second motor 5 can be rotated at a low speed regardless of the rotation direction and rotation angle of the movable panel 3, and abnormal noise from the gears of the second motor 5 and the second power transmission mechanism 6 can be obtained. Occurrence can be suppressed.

In the above embodiment , the movable panel 3 is rotatably supported at the front end portion of the slide member 2 movable in the front-rear direction, and the second motor 5 is driven in a state where the slide member 2 is moved to the forward position. The in-vehicle electronic device that rotates the movable panel 3 as a source has been described. However, a chassis fixed inside the device body 1 is used as a base, and the front end portion of the chassis is projected from the front surface of the device body. It is also possible to rotatably support the movable panel 3 on the protruding portion.

Further, in the above embodiment , the cam body 7 is used so that the frictional resistance is maximized when the movable panel 3 is in the horizontal posture. However, the cam shape of the cam body 7 depends on the installation angle of the in-vehicle electronic device. Accordingly, the cam shape may be set as appropriate so that the load can be added to a region where the motor load that is the drive source of the movable panel becomes extremely small.

It is a side view of a vehicle electronic device according to an embodiment of the present invention. It is a disassembled perspective view which shows the principal part of this vehicle-mounted electronic device. It is operation | movement explanatory drawing of the cam body and leaf | plate spring with which this vehicle-mounted electronic device is equipped. It is explanatory drawing which shows the relationship between the rotation angle of the movable panel with which this vehicle-mounted electronic device is equipped, and the load torque of a 2nd motor.

Explanation of symbols

1 Device body 2 Slide member (base)
DESCRIPTION OF SYMBOLS 3 Movable panel 4 Display screen 5 2nd motor 6 2nd power transmission mechanism 7 Cam body 7a Shaft hole 8 Connecting pin 9 Leaf spring (spring member)

Claims (2)

A movable panel having a display screen; and a torsion coil spring that varies a resilience according to a rotation angle of the movable panel that rotates the movable panel in front of the device main body. In the in-vehicle electronic device set so that the elastic force of the torsion coil spring gradually increases when rotating toward the standing posture,
A cam member that rotates in conjunction with the motor, and a bullet contact spring member to the cam member, in accordance with the rotation angle of the movable panel, the frictional resistance generated between the spring member and the cam member An in-vehicle electronic device configured to vary in a reverse relation to the elastic force of the torsion coil spring .   The cam body is integrally provided at a lower end portion of the movable panel, and a portion including the cam body of the movable panel is rotatably supported on a base body, and the spring member is mounted on the base body. In-vehicle electronic device characterized by being attached.

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