JP2001347893A - On-vehicle av device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a drive mechanism of smaller shape and less noises to insert and discharge a monitor part of an on-vehicle AV device inside and outside a dashboard and to rotate the monitor part. SOLUTION: In this on-vehicle AV device, the monitor part 50 is disposed to be freely inserted inside and discharged outside of a dashboard of a vehicle, and the monitor part 50 discharged from the dashboard is rotatably disposed. In this case, motor units with speed reducers 11, 21 are used as a drive source for inserting/discharging and rotating the monitor part 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle AV device such as a liquid crystal television and a car navigation device incorporated in a dashboard of a vehicle such as an automobile.

[0002]

2. Description of the Related Art When a liquid crystal television or a car navigation device mounted on a vehicle such as an automobile is arranged on a dashboard in front of a driver's seat, such a television or monitor is usually placed inside the dashboard due to space limitations. In many cases, it can be pulled out from the inside of the dashboard only when used.

FIG. 11 is a conceptual view of such an apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 5-170031, in which a liquid crystal television 1 usually housed in a dashboard 3 of an automobile together with a casing 2 is used when the casing is in use. 2 is drawn out of the dashboard 3 by using the drive mechanism provided in 2,
It shows a state in which it is further rotated at a predetermined angle and is used for use.

Here, an example of a conventional drive mechanism for ejecting a liquid crystal television or a monitor from a dashboard, rotating the ejected monitor at a predetermined angle, and inserting them into the dashboard again after use is described below. 7 to 1
Explanation will be made based on 0. FIG. 7 is a perspective view showing a main part of an in-vehicle liquid crystal monitor device for explaining a drive mechanism for ejecting / inserting and rotating the monitor, and FIG. 8 is a perspective view when the device of FIG. 7 is incorporated in its outer case. FIG. 9 and FIG. 9 are perspective views of the apparatus of FIG. 8 when the monitor is maximally discharged, and FIG. 10 is a perspective view of the apparatus of FIG. 8 when the monitor is rotated. It is displayed upside down).

(1) Overall Configuration The liquid crystal monitor device includes a monitor unit 100, a drive source for inserting / ejecting and rotating the monitor unit 100, a gear train mechanism for transmitting a driving force generated by the drive source, and the like. Are provided and a driving frame 80 that supports the monitor unit 100, and an outer case 90 that has a mechanism for moving the driving frame 80 forward and backward.

(2) Insertion / ejection drive section Insertion / ejection drive section 6 used for insertion / ejection of monitor section 100
Numeral 0 designates an insertion / ejection motor 61 as a drive source, a worm gear 62a is press-fitted on the axis of the insertion / ejection motor 61, and an end of the drive frame 80 via a shaft 63 supported on a side wall of the drive frame 80. Pinion gears 64a, 6
4b is installed rotatably, and the worm gear 62a
Transmission gear 62 between the pinion gears 64a and 64b.
b to 62f are installed. The toothed portion of the transmission gear 62b has a helical tooth meshing with the worm gear 62a and the transmission gear 62b.
The transmission gear 62c has a tooth profile and a transmission gear 62d.
And bevel teeth that mesh with each other. The tooth profile of the transmission gear 62d is composed of bevel teeth meshing with the transmission gear 62c and flat teeth meshing with the transmission gear 62e, and the tooth profile of the transmission gear 62e is a flat tooth meshing with the transmission gear 62d and the transmission gear 62f. The transmission gear 62f is formed of spur teeth that mesh with the transmission gear 62e. The insertion / ejection motor 61 is a frame 6 for fixing the insertion / ejection motor.
5, the insertion / ejection motor fixing frame 65 is fixed to the drive frame 80 by screws. Transmission gear 62b ~
Reference numeral 62e is guided by a metal pin (not shown) fixed by caulking to the insertion / ejection motor fixing frame 65 and the drive frame 80, and is freely rotatable. The number, shape, and the like of these transmission gears are determined by the time required for insertion / ejection of the monitor unit 100, the reduction ratio set by the required torque, and the like. Further, the drive frame 80 and the transmission gears 62b to 62
e, etc. are covered.

(3) Insertion / ejection operation (i) Ejection operation When an open switch (not shown) installed in the monitor section 100 or the like is turned on, the insertion / ejection motor 61 rotates and the worm gear 62a rotates. The rotational force of the worm gear 62
a to the transmission gear 62b (worm-helical transmission), from the transmission gear 62b to the transmission gear 62c (spur tooth-spur tooth transmission), and from the transmission gear 62c to the transmission gear 6
2d (bevel teeth-bevel teeth transmission) and the transmission gear 6
2d to the transmission gear 62e (spur tooth-spur tooth transmission), and from the transmission gear 62e to the transmission gear 62f press-fitted and installed on the shaft 63 (spur tooth-spur tooth transmission). The rotation is transmitted via a shaft 63 to pinion gears 64a and 64b press-fitted at both ends thereof.

As shown in FIG. 8, the pinion gear 64a is brought into a positional relationship with the rack gear 91a inserted and fixed inside the top surface of the outer case 90, and the pinion gear 64b
Similarly, the rack frame 91b (not shown) meshed with the rack gear 91b inserted and fixed inside the top surface of the outer case 90, and the driving frame 80 advances to the discharge side by the meshing force. At this time, the guide members 81a and 81b horizontally installed on the side surface of the drive frame 80 are attached to the outer case 90.
The inner surfaces of the substantially U-shaped support members 92a and 92b which are crimped in the horizontal direction on the inner surface side of the drive frame 80 are guided, so that the monitor unit 100 supported at both ends of the drive frame 80 moves horizontally to the discharge side. Proceeds and is discharged outside the dashboard.

(Ii) Insertion Operation When the use of the monitor unit 100 is finished and the monitor unit 100 is rotated and stands up to a horizontal state again, a signal for starting the insertion operation is input and the insertion / ejection motor 61 is ejected. By rotating in a direction opposite to the time, the rotation is transmitted to the transmission gear thereafter, and the monitor unit 100 advances to the insertion side together with the drive frame 80 and is positioned inside the dashboard.

(Iii) Insertion / ejection control In the vicinity of each maximum position during ejection and insertion, a sensor switch (not shown) is operated, and at those maximum positions,
The discharge operation and the insertion operation of the monitor unit 100 are controlled to be stopped.

(4) Rotation (tilt) drive unit The rotation (tilt) drive unit 70 used for the rotation of the monitor unit 100 uses a tilt motor 71 as a drive source, and a worm gear 72 a is press-fitted on the axis of the tilt motor 71. ,
Transmission gears 72b to 72f for transmitting from the worm gear 72a to the transmission gear 72g are provided. Monitor 1
00 is fixed to a sector gear 101 that meshes with the transmission gear 72g. The tooth profile of the transmission gear 72b is composed of a helical tooth that meshes with the worm gear 72a and a spur tooth that meshes with the transmission gear 72c. It is configured. The tooth profile of the transmission gear 72d is composed of spur teeth that mesh with the transmission gear 72c and bevel teeth that mesh with the transmission gear 72e.
The transmission gear 72f has a tooth profile portion that includes a transmission gear 72e and a spur tooth that meshes with the transmission gear 72g. Tilt motor 7
1 is fixed by screws with a tilt motor fixing frame 73, and the tilt motor fixing frame 73 is fixed by screws to a drive frame 80. The transmission gears 72b to 72g are provided with a tilt motor fixing frame 73 and a drive frame 80.
It is guided by a metal pin (symbol explanation omitted) which is fixed by swaging, and is freely rotatable. The number and shape of the transmission gear
It is determined by the time required for rotation (tilt), the reduction ratio set by the required torque, and the like. The drive frame 80 and the transmission gears 72b to 72f are covered with a drive frame lid (not shown).

(5) Rotation (tilt) operation (i) Start-up operation When the ejection of the monitor unit 100 is completed based on the operation of the insertion / ejection drive unit 60 and a signal for starting the tilt operation is input, the tilt motor 71 rotates. And the worm gear 7
2a rotates. The rotational force is transmitted from the worm gear 72a to the transmission gear 72b (the transmission of the worm-helical teeth), and the transmission gear 72c transmits a transmission gear 72c (external force or the like) that exerts a force equal to or greater than the set value to the monitor unit 100 or the like. When it is applied, it functions to cut off its rotation, and is also called a clutch (mechanism), which is provided with two gears that are connected or cut off.
Transmission of the spur teeth), transmission from the transmission gear 72c to the transmission gear 72d (transmission of the spur teeth-spur teeth), transmission from the transmission gear 72d to the transmission gear 72e (transmission of the bevel teeth-bevel teeth), and from the transmission gear 72e The transmission gear 72f is transmitted (spur tooth-spur tooth transmission), and the final transmission gear 72 on the drive side is transmitted from the transmission gear 72f.
g (spur tooth) (spur tooth-spur tooth transmission). Further, the rotation is transmitted to the fan-shaped gear 101 (the spur teeth) meshing with the transmission gear 72g, so that the fan-shaped gear 101 and the fixed monitor unit 100 rotate to the set angle.

The monitor section 100 includes a drive frame 80 and arms 82a and 82b provided at the front end portions of the side surfaces of the drive frame. The arm 82b has an axis passing through the center of the sector gear 101 and the arm 82a. Is rotated (started up) about these axes by shafts installed on the side facing the fan-shaped gear 101.

(Ii) Shutdown operation When a close switch (not shown) installed on the monitor unit 100 or the like is turned on, the tilt motor 71 starts to rotate in a direction opposite to the start up, and the rotation is transmitted to the transmission gear thereafter. Then, the monitor unit 100 is lowered from the standing state to the horizontal state.

(Iii) Rotation Control The rotation control of the monitor unit 100 is usually performed by using a gear after the transmission gear 72c constituting a tilt-side torque limiter, and using a light sensor to attach a reflection plate attached to the side of the gear. The rotation angle of the monitor unit 100 is controlled by using a method of utilizing the reflection of the monitor unit 100, a method of constructing another gear for rotating the variable resistor from the transmission gear and extracting the resistance value, or the like.

[0016]

In a product having a drive mechanism using a motor and a gear train and having a mechanism for ejecting / inserting and rotating the device, a predetermined reduction ratio is required to produce a required torque. Need to be secured. Therefore, when the volume of a part constituting such a mechanism is limited (especially thinness is required) as in the case of an in-vehicle AV device incorporated in a dashboard, as described above, there are various types of components. This must be realized using a large number of gears (worm gear, helical gear, bevel gear, spur gear, etc.). However, the driving mechanism thus configured has the following problems.

Since there are many types and many gear train structures,
Space efficiency and torque transmission efficiency deteriorate. When the gears other than the spur gears such as the worm gear mesh with each other, a large meshing noise is generated. (Especially, the meshing noise between the worm gear and the helical tooth is likely to occur, and conventionally, the mold has been corrected repeatedly to deal with it.) Since the number of parts is large, the cost of the product is increased. (Parts cost, mold cost, assembly cost, and inspection cost increase accordingly.) The present invention has been made to solve these problems, and employs the following configuration.

[0018]

SUMMARY OF THE INVENTION The present invention relates to an on-vehicle AV apparatus in which a monitor section is disposed so as to be freely inserted into and ejected from a dashboard of a car. Use a motor unit with Further, in a vehicle-mounted AV device in which a monitor disposed on a dashboard of a car is rotatably disposed outside the dashboard, a motor unit with a speed reducer is used as a rotation drive source of the monitor. Also, in the on-vehicle AV device in which the monitor section is arranged so as to be inserted / ejectable inside / outside the dashboard of the car and the monitor section ejected from inside the dashboard is rotatably arranged, A motor unit with a speed reducer is used as the insertion / ejection and rotation drive source.

As described above, when a motor unit with a speed reducer is used as a drive source for inserting / ejecting and rotating the monitor unit, the output torque of the motor unit becomes higher than that of a normal motor alone. The ratio (rotational speed, torque, etc.) can be secured. Therefore, the space in the gear train portion can be reduced, and a predetermined speed reduction ratio (rotational speed, torque, etc.) can be ensured in a space-saving manner even with a gear train configuration using only spur gears.

Further, in the case where the driving force generated by the motor unit with a speed reducer is transmitted using a gear train, the gear train is constituted only by a spur gear train. With such a wheel train configuration of the spur gears, the transmission efficiency of force can be improved, and the generation of loud meshing noise can be prevented.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described with reference to the drawings. FIG. 1 is a perspective view showing a main part of an in-vehicle liquid crystal monitor device for explaining a drive mechanism for ejecting / inserting and rotating the monitor, and FIG. 2 is a diagram when the device of FIG. 1 is incorporated in its outer case. Perspective view of the
FIG. 3 is a perspective view of the apparatus shown in FIG. 2 when the monitor is rotated (here, the drive mechanism is shown upside down from a normal installation state for easy understanding).

In the present embodiment, a motor unit with a speed reducer is used as the discharge / insertion and rotation drive source of the monitor unit. The motor unit with a speed reducer incorporates a motor and a speed reducer such as a planetary gear inside thereof.
No. 66046, a small speed reducer disclosed in
A film winding mechanism disclosed in US Pat. In these motor units with a speed reducer, by setting the motor unit including the speed reducer so that a predetermined number of revolutions, torque, etc. can be secured, the gear train transmitting its driving force can be formed only by spur gears. In addition, the required number of gears can be reduced compared to the prior art, and the required reduction ratio (rotational speed, torque, etc.) can be secured.

(1) Overall Configuration The liquid crystal monitor device comprises a monitor section 50 and a monitor section 5.
A drive frame 30 for supporting a monitor unit 50 in which a drive mechanism for inserting / ejecting, rotating, etc. 0, and a drive mechanism including a gear train transmitting the driving force generated by the drive source are arranged, and a drive frame And an outer case 40 provided with a mechanism for moving the 30 forward and backward.

(2) Insertion / ejection drive section Insertion / ejection drive section 10 used for insertion / ejection of monitor section 50
Includes a motor unit 11 with an insertion / ejection speed reducer adjusted to a predetermined speed reduction ratio (rotation speed, torque, etc.) as a drive source. The motor unit 11 with an insertion / ejection speed reducer is disposed on a drive frame 30, and a transmission gear 12 a is press-fitted into the output shaft of the motor unit 11 with an insertion / ejection speed reducer. The transmission gear 12a meshes with a transmission gear 12b press-fitted on a shaft 13 rotatably supported on the side wall of the drive frame 30, and pinion gears 14a and 14b are press-fitted on both ends of the shaft 13. The motor unit 11 with an insertion / ejection speed reducer is fixed by screws with an insertion / ejection motor fixing frame 15, and the insertion / ejection motor fixing frame 15 is screw-fixed to a drive frame 30.
The transmission gear 12a is guided by a fixing pin fixed to the side surface of the drive frame 30 by caulking.

(3) Insertion / ejection operation (i) Ejection operation When an open switch (not shown) installed on the monitor unit 50 or the like is turned on, the motor unit 11 with the insertion / ejection speed reducer is turned on.
Rotates, and the rotation is transmitted via the output shaft to the transmission gear 12a.
(The spur teeth) and transmitted from the transmission gear 12a to the shaft 13
The rotation is transmitted to the pinion gears 14 a and 14 b via the shaft 13 by being transmitted to the upper transmission gear 12 b (the spur teeth).

The pinion gear 14a is in a positional relationship to mesh with a rack gear 41a inserted and fixed inside the top surface of the outer case 40, and the pinion gear 14b is similarly rack gear 41b inserted and fixed inside the top surface of the outer case 40 (shown in FIG. ), And the driving frame 30 advances to the discharge side by the engaging force. At this time, the guide member 3 installed horizontally on the side of the drive frame 30
1a and 31b are guided on the inner surfaces of the substantially U-shaped support members 42a and 42b which are horizontally crimped on the inner surface side of the outer case 40, whereby the monitor unit 50 supported at both ends of the drive frame 30 is moved. Going to the discharge side while maintaining the level, it is discharged to the outside of the dashboard.

(Ii) Insertion Operation When the use of the monitor unit 50 is finished and the monitor unit 50 is rotated and stands up to a horizontal state again, a signal of an insertion operation start is input and a speed reducer for insertion / ejection is provided. The motor unit 11 rotates in a direction opposite to that at the time of discharging, and the rotation is transmitted to the transmission gear thereafter, and the monitor unit 50 advances to the insertion side (the inside of the dashboard) together with the drive frame 30.

(Iii) Insertion and Ejection Control Sensor switches are operated near the maximum positions during ejection and insertion, and control is performed so that the ejection and insertion operations of the monitor unit 50 are stopped at those maximum positions. .

According to this configuration, the wheel train configuration of the drive mechanism from the motor unit 11 with the insertion / ejection speed reducer to the pinion gears 14a and 14b is much smaller than in the past, so that the space for the drive mechanism is small. In addition, since the entire gear train is formed of spur teeth, generation of meshing noise of the gears can be suppressed.

(4) Rotation (tilt) drive unit The rotation drive unit 20 used for rotation (tilt) of the monitor unit 50 serves as a drive source, and a tilt adjusted to a predetermined reduction ratio (rotational speed, torque, etc.). The motor unit 21 with a speed reducer is disposed on the drive frame 30, and the transmission gear 22 a is press-fitted on the tilt output shaft of the motor unit 21 with the tilt speed reducer. Then, transmission gears 22b to 22d for transmitting the rotational force of the motor unit 21 with the tilt reducer to the transmission gear 22e are provided (where the transmission gear 22d is engaged with both the front and rear gears 22c and 22e. Gears). Further, the monitor unit 50 includes
A sector gear 51 meshing with the transmission gear 22e is fixed.

Motor unit 21 with tilt reducer
Is fixed by screws with a tilt motor fixing frame 23,
The tilt motor fixing frame 23 is fixed to the drive frame 30 by screws. The transmission gear 22a is rotatably guided by a fixing pin 24a fixed to the side surface of the drive frame 30 by caulking. Metal pins 24b rotatably mounted on the tilt motor fixing frame 23 and the drive frame 30 are inserted into the shaft centers of the transmission gears 22b and 22c. The transmission gears 22b and 22c and the metal pin 24b will be described later. It constitutes a torque limiter.

The transmission gears 22d and 22e are fixed pins 24 fixed to the tilt motor fixing frame 23 by caulking.
Guided by c and 24d, it is freely rotatable. The fixing pins 24c and 24d are received by guide holes of the drive frame 30 facing each other. The drive frame lid (not shown) covers the drive frame 30.

(5) Rotation (tilt) operation (i) Start-up operation When the ejection of the monitor unit 50 by the insertion / ejection drive unit 10 is completed,
When a rotation operation start signal is input, the motor unit 21 with the tilt speed reducer starts rotating, whereby the transmission gear 22a (the spur teeth) rotates. This torque is transmitted by the transmission gear 22
a to the transmission gear 22b (spur teeth) constituting the torque limiter, and from another transmission gear 22c (spur teeth) constituting the torque limiter to the transmission gear 22d.
(Spur teeth + spur teeth), and is transmitted from the transmission gear 22d to the final transmission gear 22e (spur teeth) on the driving side. Then, the rotational force of the transmission gear 22 e is transmitted to the fan-shaped gear 51, and the monitor unit 5 fixed to the fan-shaped gear 51.
Rotate to an angle where 0 is set.

The monitor unit 50 is provided with the drive frame 3
0 is an arm 3 provided at the front end of the drive frame side surface.
2a and 32b, the arm portion 32b
Is rotated by an axis passing through the center of the fan-shaped gear 51, and the arm 32a is rotated (started) about both of these axes by an axis provided on the side opposite to the sector-shaped gear 51.

(Ii) Shutdown operation When a close switch (not shown) installed in the monitor unit 50 or the like is turned on, the motor unit 2 with a tilt reducer is turned on.
1 starts rotation opposite to the start-up, and the rotation is transmitted to the transmission gear thereafter to rotate (fall) the monitor unit 50 from the upright state to the horizontal state.

(Iii) Rotation control The rotation control of the monitor unit 50 uses the gears and the like after the transmission gear 22c, which normally constitutes a torque limiter on the tilt side, and uses the reflection from a reflection plate attached to the side surface of the gear with an optical sensor. This is performed by controlling the rotation angle of the monitor unit 50 by a method of extracting the resistance value by configuring another gear for rotating the variable resistor from the transmission gear.

According to this configuration, the wheel train configuration of the drive mechanism from the motor unit 21 with the tilt speed reducer to the fan-shaped gear 51 is reduced as compared with the prior art, so that the space for the drive mechanism is reduced. Since all of the gear trains are constituted by spur teeth, generation of meshing noise of the gears can also be suppressed.

It should be noted that in the above embodiment, the insertion /
The number, shape, etc. of the gears in the gear train for discharging or transmitting the driving force for rotation depends on the time required for them, the output torque of the motor unit with a reduction gear, the reduction ratio set by the finally required torque, etc. It will be decided by. Therefore, in the above-described rotary drive unit, the gear train is configured using the transmission gears 22a to 22e. However, the transmission gear 22d is formed by setting the motor unit 21 with the tilt reducer and the reduction ratio of the transmission gear to be used. Omitted, transmission gear 2
A configuration in which 2c and 22e are directly engaged with each other is also possible.

Next, the torque limiter used in the above embodiment will be described. FIG. 4 is a perspective view of the torque limiter, and FIG. 5 is an exploded perspective view thereof.

The torque limiter 200 has a gear portion 22b in which a gear is formed, and a holder portion 120 provided in parallel with the gear portion.
Gear member 110 having a bearing hole (or bearing portion) 121 rotatably supporting the first gear member 110 and first gear member 11
0, a second gear member 22c fixed to the end of the shaft 140 inserted into the first gear member 110, and a bearing hole in the holder 120 of the first gear member 110. A substantially U-shaped leaf spring 16 inserted and fixed in an opening 122 penetrating substantially perpendicularly to the opening 121 and holding the shaft 140 by its spring pressure.
0.

The holder section 120 and the gear section 22b of the first gear member 110 are integrally formed of a plastic material or the like. When the two free ends 161 of the substantially U-shaped leaf spring 160 are inserted from one of the openings 122 of the holder part 120, the two free ends 161 fit into the opposed surfaces of the holder part 120 in a slightly bent form, and The ends of the two free ends 161 are connected to the end 123 of the other opening 122.
, The substantially U-shaped leaf spring 160 is fixed to the first gear member 110. The shaft 140 is inserted into the first gear member 110 in which the substantially U-shaped leaf spring 160 is incorporated from the bearing hole 121 on the gear portion 22b side until the gear portion 22b of the first gear member 110 hits the stopper portion 142 of the shaft 140. insert. The circular section 141 of the shaft 140 corresponds to the width of the first gear member 110. As a result, the substantially U-shaped leaf spring 160 holds the shaft 140 by the holding force due to frictional resistance while sandwiching the circular section 141 from both sides. Furthermore, the shaft 140 and the second gear member 22c are fixed by press-fitting the track cross-sectional shape portion 143 of the shaft 140 into the track cross-sectional hole 151 of the second gear member 22c formed of a plastic material or the like. Is configured.

This torque limiter 200 operates as follows. When the rotational load acting on the second gear portion 22c is within a predetermined value (within a holding force due to frictional resistance between the spring 160 and the circular cross-sectional shape portion 141 of the shaft 140), the spring 1
First gear member 110 sandwiching shaft 140 at 60
Rotates integrally with the second gear member 22c and the shaft 140. When the rotational load acting on the second gear member 22c is equal to or greater than a predetermined value (a value exceeding a holding force due to frictional resistance between the spring 160 and the circular cross-sectional shape portion 141 of the shaft 140),
Slip occurs between the first gear member 110 and the second gear member 22c, and the second gear member 22c and the shaft 140
Only the rotation is performed, and the rotation is not transmitted to the first gear member 110. Therefore, when the torque limiter 200 is held by a structural member, it must be held so that the shaft 140 can rotate freely.

FIG. 6 is a gear arrangement diagram showing a gear train in the present embodiment located before and after the torque limiter 200. Here, the drive mechanism of the monitor unit 50 has a torque between a transmission gear 22a fixed to the output shaft of the motor unit 21 with the tilt reduction gear and a transmission gear 22d formed in two stages on the driven object side. The limiter 200 is arranged, and the gear portion 22b of the first gear member 110 of the torque limiter 200 meshes with the transmission gear 22a, and the second gear member 22c of the torque limiter 200 meshes with the larger diameter gear of the transmission gear 22d. ing. Here, the metal pin 24b corresponds to the shaft 140 in FIG. 4 and FIG. Accordingly, even if the monitor unit 50 is forcibly rotated by a human hand or the like, if the force is equal to or more than a predetermined value, the torque is limited to the torque limiter 2.
Since it is interrupted at 00, it is possible to prevent the gears constituting the drive mechanism from being damaged. In addition, the torque limiter 20
The second gear member 22c may be disposed on the drive side, and the gear portion 22b of the first gear member 110 may be disposed on the driven body side.

This torque limiter is smaller and more reliable than the one using a conventional compression spring.
Furthermore, rotation noise is also suppressed. Therefore, the liquid crystal monitor device of the present embodiment in which the torque limiter and the motor unit with the speed reducer are combined has a great improvement over the conventional device in terms of downsizing of the device, improvement of reliability, reduction of noise, and the like. Achieved. Further, since the torque output from the motor unit with a speed reducer is higher than the torque from a normal motor, it is particularly effective to use the motor unit with a speed reducer in combination with the torque limiter of the present structure.

[0045]

As described above, according to the present invention, the drive source of the drive mechanism for inserting / ejecting and rotating the monitor of the in-vehicle AV device into and out of the dashboard is provided by the motor unit with the speed reducer. As a result, the drive mechanism can be configured with a smaller gear train and a required reduction ratio can be obtained. Therefore, even if the gear train mechanism for transmitting the driving force is constituted only by spur gears, it does not take up a large space, and furthermore, the gear train of only spur gears can minimize the gear meshing noise. It has become possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an in-vehicle liquid crystal monitor device for explaining a driving mechanism according to an embodiment of the present invention for ejecting / inserting and rotating a monitor.

FIG. 2 is a perspective view when the device of FIG. 1 is incorporated in its outer case.

FIG. 3 is a perspective view of the apparatus shown in FIG. 2 when the monitor is rotated (upside down from a normal installation state for easy understanding of a driving mechanism).

FIG. 4 is a perspective view of a torque limiter used in the embodiment of the present invention.

FIG. 5 is an exploded view of the torque limiter of FIG. 4;

FIG. 6 is a gear arrangement diagram including gears before and after the torque limiter in FIG. 4;

FIG. 7 is a perspective view showing a main part of an in-vehicle liquid crystal monitor device for explaining a conventional drive mechanism for ejecting / inserting and rotating a monitor.

FIG. 8 is a perspective view when the device of FIG. 7 is incorporated in its outer case.

FIG. 9 is a perspective view of the apparatus of FIG. 8 at the time of maximum discharge of a monitor.

10 is a perspective view of the apparatus of FIG. 8 when the monitor is rotated (upside down from a normal installation state for easy understanding of the drive mechanism).

FIG. 11 is a view showing a state in which a liquid crystal television set housed in a dashboard of an automobile is pulled out of the dashboard, rotated at a predetermined angle, and used for use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Motor unit with insertion / ejection reduction gear 12a-12b Transmission gear 14a, 14b Pinion gear 21 Motor unit with tilt reduction gear 22a-22e Transmission gear 30 Drive frame 40 Exterior case 50 Monitor part 200 Torque limiter

Claims (4)

[Claims] 1. An on-vehicle AV device in which a monitor section is inserted and ejected into and out of a dashboard of a car, wherein a motor unit with a speed reducer is used as an insertion / ejection drive source of the monitor section. Features of in-vehicle AV
apparatus. 2. An on-vehicle AV device in which a monitor disposed on a dashboard of a car is rotatably disposed outside the dashboard, wherein a motor unit with a reduction gear is used as a rotation drive source of the monitor. An on-vehicle AV device, characterized in that: 3. An in-vehicle AV device in which a monitor section is inserted / ejected into and out of a dashboard of a car and a monitor section ejected from inside the dashboard is rotatably arranged. As the insertion / ejection of the monitor part and the rotation drive source,
An in-vehicle AV device using a motor unit with a reduction gear. 4. The transmission of the driving force generated by the motor unit with a speed reducer using a gear train, wherein the gear train is constituted only by a spur gear train. 4. The on-vehicle AV device according to any one of 1 to 3.