Drive device, movable display device, assembly method for drive device and assembly method for movable display device

Abstract

To provide a drive device and a movable display device capable of firmly fixing a rotational shaft and a gear and capable of adjusting a tightening amount of a fixing screw to adjust an angle phase of the gear relative to the rotational shaft, an assembly method for the drive device and an assembly method for the movable display device.SOLUTION: A first fixing screw 44 and a second fixing screw 45 are screwed to a pinion gear 22a. An extension line Os1 of an axial core of the first fixing screw 44 and an extension line Os2 of an axial core of the second fixing screw 45 do not intersect with an axial center line Or of a rotational shaft. A tightening moment around the axial center line Or caused by the tightening force of the first fixing screw and a tightening moment around the axial center line Or caused by the tightening force of the second fixing screw act in opposite directions.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a drive device having a gear fixed to a rotation shaft, a movable display device that uses the drive device to set a display member between a display position and a non-display position, a method for assembling a drive device that can adjust the relative angle between the rotation shaft and the gear, and a method for assembling a movable display device using the method for assembling the drive device. [Background technology]

[0002] Patent Document 1 describes an invention related to an in-vehicle display device. This display device has a pair of side plates connected by a connecting plate, and a slider is guided vertically by each side plate. A support plate is connected to both sliders, and a display panel is fixed to the support plate. A power transmission mechanism is provided on each side plate. In the power transmission mechanism, a timing belt is wound around a drive timing pulley and a driven timing pulley supported by the side plates, and a slider is connected to each timing belt. A connecting shaft is supported in a U-shaped groove formed in the two side plates. Connecting gears are fixed to both ends of the connecting shaft and mesh with synchronous gears provided in each power transmission mechanism. When the motor rotates, its power is transmitted from the idle gear to the drive gear fixed to the connecting shaft. When the connecting shaft is rotated, the synchronous gears rotate the timing belts of both power transmission mechanisms, moving the sliders connected to the timing belts and the support plates up and down, and thus moving the display panels fixed to the support plates up and down.

[0003] Patent Document 1 describes the assembly process for an in-vehicle display device. In this assembly process, after incorporating a power transmission mechanism into each of the left and right side plates, a jig is inserted into the positioning holes in the slider and the side plates to temporarily fix the left and right sliders and side plates in a parallel position at a reference position. In this state, the connecting shaft is dropped into the U-shaped grooves in the left and right side plates, and the drive gear fixed to the connecting shaft is meshed with the idle gear, and the pair of connecting gears fixed to the connecting shaft are meshed with the left and right synchronous gears. After that, the connecting plates are fixed to the left and right side plates, and the temporarily fixed state is released. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-15091 Summary of the Invention [Problem to be solved by the invention]

[0005] In the in-vehicle display device described in Patent Document 1, motor power is transmitted from a connecting gear fixed to a connecting shaft to synchronizer gears of the left and right power transmission mechanisms. In this structure, when a large display panel with a large mass is used, a large load torque acts on the connecting shaft during operation, making it necessary to firmly fix the connecting shaft and the connecting gear. One structure that can withstand large load torque is to spline-connect the connecting shaft and the connecting gear. However, this connection structure requires spline machining on both the surface of the connecting shaft and the fixing hole of the connecting gear, resulting in extremely high processing costs. Another commonly used structure integrates the connecting shaft and the connecting gear using frictional resistance by threading a fixing screw into a boss protruding from the connecting gear and applying pressure to the surface of the connecting shaft with the tip of the fixing screw. However, this connection structure is prone to problems such as loosening of the fixing screw or slippage of the connecting gear relative to the connecting shaft when the load torque increases.

[0006] Furthermore, when moving a large display panel with a large mass, the modules of gears such as connecting gears must be enlarged to withstand the load torque, resulting in increased backlash at the gear meshing points. Furthermore, the side plates and components constituting the power transmission mechanism must be enlarged, reducing the dimensional accuracy of each component and making it difficult to synchronize the left and right power transmission mechanisms with high precision. In the assembly process described in Patent Document 1, the left and right side plates and sliders are positioned using jigs, but when each component becomes large, even with jig positioning, there are limitations to synchronizing the left and right power transmission mechanisms with high precision. Furthermore, in the assembly process, after the left and right side plates and sliders are positioned, a connecting shaft to which the drive gear and connecting gear are fixed is assembled. However, it is difficult to fix a large drive gear with a large module and two connecting gears to the connecting shaft so that their angular phases are perfectly aligned with each other, and when assembling the connecting shaft into the left and right side plates, problems such as difficulty in smoothly meshing the connecting gear and idle gear and increased meshing resistance can easily arise.

[0007] The present invention aims to solve the above-mentioned conventional problems, and aims to provide a drive unit that can firmly fix a gear to a rotating shaft, even in a structure in which the gear is fixed to the rotating shaft with a fixing screw, and that is structured to be able to handle large load torque, and a movable display device that uses the drive unit to set a display member between a display position and a non-display position.

[0008] Another object of the present invention is to provide a method for assembling a drive unit that can adjust the relative angle between the rotation axis and the gear to drive, for example, left and right slide members in synchronization with each other, and a method for assembling a movable display device using the above-mentioned method for assembling a drive unit. [Means for solving the problem]

[0009] The present invention provides a drive device having a motor and a power transmission mechanism that transmits power of the motor, the power transmission mechanism includes a gear, a rotating shaft inserted into the gear, and two fixing screws that are screwed into the gear and press the rotating shaft, and an extension line of the axis of each fixing screw is located at a position that does not intersect with the axial center line of the rotating shaft; The tightening moment around the axial center line due to the tightening force of one of the fixing screws and the tightening moment around the axial center line due to the tightening force of the other fixing screw act in opposite directions to each other.

[0010] The drive device of the present invention can be configured such that a receiving plane is formed on the shaft surface of the rotating shaft, and the tips of the two fixing screws abut against one of the receiving planes.

[0011] The drive device of the present invention includes a support member and a slide member movably supported on the support member, A rack member extending along the movement direction of the slide member is fixed to either the support member or the slide member, and the rotating shaft is rotatably supported on the other, with the gear meshing with the rack member.

[0012] The movable display device of the present invention comprises: the drive device; a display member supported so as to be rotatable between a display position and a non-display position; a switching mechanism that rotates the display member toward the display position by a moving force when the sliding member moves in a display setting direction, and rotates the display member toward the non-display position by a moving force when the sliding member moves in a non-display setting direction that is the opposite direction to the display setting direction; It is characterized by having:

[0013] The driving device of the present invention can be configured so that the force exerted by the switching mechanism when the slide member moves to the display setting position causes the display member to rotate toward a display position in which the tip end on the side opposite the rotation support side faces the direction of gravity, and the force exerted when the slide member moves to the non-display setting position causes the display member to rotate toward a non-display position in which the tip end is raised.

[0014] Furthermore, the present invention provides a method for assembling a drive device having a motor and a power transmission mechanism that transmits power of the motor, the method comprising the steps of: the power transmission mechanism includes a gear, a rotating shaft inserted through the gear, and two fixing screws threadedly attached to the gear, and an extension line of the axis of each fixing screw is located at a position that does not intersect with the axial center line of the rotating shaft; an adjustment step of abutting a tip of one of the fixing screws against a receiving plane formed on a shaft surface of the rotating shaft and tightening the fixing screw to adjust the relative angle of the gear with respect to the rotating shaft; a tightening process in which a tip of the other fixing screw is brought into contact with a receiving plane formed on the shaft surface of the rotating shaft, and the other fixing screw is tightened so that a tightening moment around the shaft center line due to the tightening force of one fixing screw and a tightening moment around the shaft center line due to the tightening force of the other fixing screw act in opposite directions to fix the gear and the rotating shaft whose relative angle has been adjusted; It is characterized by having:

[0015] The method for assembling a drive device of the present invention includes assembling a drive device having a support member and a slide member movably supported by the support member, a rack member extending along the moving direction of the slide member is fixed to one of the support member and the slide member, and the rotation shaft is rotatably supported by the other; The adjusting step and the tightening step may be performed in a state in which the gear is meshed with the rack member.

[0016] The method for assembling a drive device of the present invention includes assembling a drive device having a support member, two slide members movably supported on the support member, and at least two gears fixed to the rotation shaft, a rack member extending along the moving direction of the slide member is fixed to one of the support member and each of the slide members, and the rotation shaft is rotatably supported by the other; The adjusting step and the tightening step can be performed for at least one gear and the rotating shaft with each gear meshed with the rack.

[0017] In the method for assembling a drive device of the present invention, the adjusting step can adjust the relative angle of the gear with respect to the rotation shaft so that the relative positions of the two slide members become appropriate.

[0018] Furthermore, the present invention provides a method for assembling a movable display device having a display member supported so as to be rotatable between a display position and a non-display position, the method comprising the steps of: a switching mechanism that rotates the display member toward the display position by a moving force when the slide member moves in a display setting direction, and rotates the display member toward the non-display position by a moving force when the slide member moves in a non-display setting direction that is the opposite direction to the display setting direction, The method for assembling any one of the drive devices is characterized in that the adjusting step and the tightening step are carried out after the switching mechanism is constructed. [Effects of the Invention]

[0019] In the drive unit of the present invention, the tightening moment around the axis of the rotating shaft due to the tightening force of one fixing screw and the tightening moment around the axis of the rotating shaft due to the tightening force of the other fixing screw act in opposite directions, making it possible to firmly fix the gear to the rotating shaft. In a movable display device using this drive unit, it is possible to maintain the relative angular phase between the rotating shaft and the gear even if the mass of the display member is large and the load acting on the drive unit is large.

[0020] In the assembling method of the drive unit of the present invention, by tightening one fixing screw and then tightening the other fixing screw, the relative angle between the rotating shaft and the gear can be finely adjusted, and the power transmission device can be configured with high precision, and for example, two sliding members can be operated synchronously with their relative positions determined with high precision.In addition, in the assembling method of the movable display device of the present invention, it is possible to switch the display member between the display position and the non-display position in the normal position after assembly. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view showing the overall structure of a movable display device according to an embodiment of the present invention, in which a display member is in a display position; FIG. [Figure 2] 1 is a perspective view showing the overall structure of a movable display device according to an embodiment of the present invention, in which a display member is in a non-display position; FIG. [Figure 3] FIG. 2 is a partially exploded perspective view showing an enlarged portion of FIG. 1, mainly showing the structure of the base member and the drive unit; [Figure 4] FIG. 1 is a perspective view showing only a power transmission mechanism provided in a drive device of a movable display device; [Figure 5] FIG. 5 is an enlarged partial cross-sectional view of one of the gears and the rotating shaft constituting the power transmission mechanism shown in FIG. 4, taken along line VV; [Figure 6] FIG. 1 is a side cross-sectional view showing a state in which a display member is in a display position in a movable display device according to an embodiment of the present invention; [Figure 7] 1 is a side cross-sectional view showing an operating state in which a display member is in the middle of transitioning from a display position to a non-display position in a movable display device according to an embodiment of the present invention; FIG. [Figure 8] FIG. 1 is a side cross-sectional view showing a state in which a display member is in a non-display position in a movable display device according to an embodiment of the present invention; [Figure 9A] 1 is a partially enlarged cross-sectional view of a gear and a rotating shaft for explaining an adjustment process in the assembly method of the drive device and the assembly method of the movable display device of the present invention; [Figure 9B]1 is a partially enlarged cross-sectional view of a gear and a rotating shaft for explaining an adjustment process in the assembly method of the drive device and the assembly method of the movable display device of the present invention; [Figure 9C] 1 is a partially enlarged cross-sectional view of a gear and a rotating shaft for explaining a fastening process in the method for assembling a drive device and a method for assembling a movable display device according to the present invention; [Figure 10] 10 is a partially enlarged cross-sectional view of a gear and a rotating shaft showing another embodiment of the present invention; [Figure 11] 10 is a partially enlarged cross-sectional view of a gear and a rotating shaft showing another embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0022] <Driver and Movable Display> The movable display device 1 according to the embodiment of the present invention is installed and used on the ceiling of the interior of an automobile. The movable display device 1 can also be installed and used on the ceiling of the interior of a train, an airplane, or a building.

[0023] In each figure, the Y1-Y2 direction is the front-to-rear direction, with the Y1 direction being rearward and the Y2 direction being forward. The Y1 direction is the direction toward the display setting position, and the Y2 direction is the direction toward the non-display setting position. The X1-X2 direction is the horizontal direction, with the X1 direction being leftward and the X2 direction being rightward. The Z1-Z2 direction is the vertical direction, with the Z1 direction being upward and the Z2 direction being downward. When the movable display device 1 is installed on the ceiling inside the vehicle, the Z2 direction is the direction of gravity.

[0024] As shown in FIGS. 1 and 2, the movable display device 1 has base members 2a and 2b. The base members 2a and 2b are support frames that extend linearly and parallel to each other in the front-to-rear direction (Y1-Y2 direction). The base member 2a is located on the left side (X1 side), and the base member 2b is located on the right side (X2 side). A horizontal frame (not shown) extending in the horizontal direction (X1-X2 direction) is fixed to the top surfaces of the base members 2a and 2b, and the base members 2a and 2b are connected by the horizontal frame so that they can maintain a parallel posture. When the movable display device 1 is installed on the ceiling of a vehicle interior, the horizontal frame is fixed to the ceiling, and the base members 2a and 2b are fixed parallel to the XY plane, which is a substantially horizontal plane.

[0025] 1 and 2, a left-side drive unit 10a is provided on the left-side base member 2a, and a right-side drive unit 10b is provided on the right-side base member 2b. The drive units 10a and 10b are the structures and mechanisms of the components shown in FIGS. 1 and 2, excluding the base members 2a and 2b and the display member 3, which will be described later.

[0026] FIG. 3 shows the left-side drive unit 10a in detail. A bracket 11 is provided on the left-side drive unit 10a. The bracket 11 is bent at a right angle to form a vertical support piece 11a and a horizontal support piece 11b. As shown in FIGS. 1 and 2, the vertical support piece 11a is fixed by screws to the inner surface of the base member 2a facing the right side (X2 side). The base member 2a and the bracket 11 form a left-side support member 12a. A fixed rail 13 is fixed by screws to the surface facing the right side of the vertical support piece 11a. The fixed rail 13 extends linearly in the front-to-rear direction (Y1-Y2 direction). A slide member 14a is supported on the left-side drive unit 10a. As shown in FIG. 3, the slide member 14a has an outer slide portion 15 and an inner slide portion 16. At the front of the slide member 14a, the outer slide portion 15 and the inner slide portion 16 are fixed to each other by a front connecting shaft 17, and at the rear, the outer slide portion 15 and the inner slide portion 16 are fixed to each other by a rear connecting shaft 18. The outer slide portion 15 is a movable rail, and is held on the fixed rail 13 so as to be slidable in the front-to-rear direction. The slide member 14a, which is made up of the outer slide portion 15 and the inner slide portion 16 fixed to each other, is supported so as to be movable linearly back and forth in the front-to-rear direction (Y1-Y2 direction) relative to the base member 2a.

[0027] As shown in Figures 1 and 2, the right-side drive unit 10b has a mirror image structure in the left-right direction (X1-X2 direction) with respect to the left-side drive unit 10a. In the right-side drive unit 10b, a bracket 11 is fixed to a base member 2b, and the base member 2b and the bracket 11 together form a right-side support member 12b. In the right-side drive unit 10b, a slide member 14b, consisting of an outer slide portion 15 and an inner slide portion 16, is supported on the base member 2a so as to be linearly movable back and forth in the front-to-back direction (Y1-Y2 direction). The left-side slide member 14a and the right-side slide member 14b are connected to each other by a slide connecting member 19 provided at the front (Y2 direction). The slide connecting member 19 constitutes part of the "slide member," and the left-side slide member 14a, the right-side slide member 14b, and the slide connecting member 19 are integrally supported on the left-side support member 12a and the right-side support member 12b so as to be movable back and forth in the front-to-back direction.

[0028] As shown in FIGS. 1 and 2, a rotary shaft 21 extending in the left-right direction (X1-X2 direction) is provided between the left-side drive unit 10a and the right-side drive unit 10b. The rotary shaft 21 is a connecting drive shaft that provides driving force to both the left-side drive unit 10a and the right-side drive unit 10b. As shown in FIG. 3, the left end (X1 side) of the rotary shaft 21 is rotatably supported by a bearing 24 fixed to the inner slide portion 16 of the slide member 14a. In the left-side drive unit 10a, as shown in FIG. 3, a rack member 23 is fixed to the lower surface of the horizontal support piece 11b of the bracket 11. A pinion gear 22a is fixed to the left end of the rotary shaft 21, and the pinion gear 22a meshes with rack teeth formed on the lower part of the rack member 23. In the right-side drive unit 10b, the right end of the rotary shaft 21 is rotatably supported by a bearing 24 fixed to the inner slide portion 16 of the slide member 14b. A pinion gear 22b is also fixed to the right end of the rotary shaft 21, and the pinion gear 22b meshes with the rack teeth of a rack member 23 fixed to the bracket 11 of the right-side drive unit 10b.

[0029] FIG. 4 shows the structure of a power transmission mechanism 40 that transmits motor power to the left-side drive unit 10a and the right-side drive unit 10b. In the power transmission mechanism 40, a drive source 41 is mounted on the inner slide portion 16 provided in the right-side drive unit 10b. The drive source 41 has a motor 42 and a gear group 43 that reduces the rotational output of the motor 42, and an output gear of the gear group 43 meshes with the right-side pinion gear 22b. When the motor 42 starts, the right-side pinion gear 22b is driven, and the rotary shaft 21 is rotated. As a result, in both the left-side drive unit 10a and the right-side drive unit 10b, the rotational force of the pinion gears 22a, 22b meshing with the rack member 23 causes the left and right slide members 14a, 14b to reciprocate synchronously in the front-rear direction (Y1-Y2 direction).

[0030] The cross-sectional view of Figure 5 shows the fixing structure between the rotary shaft 21 and the left pinion gear 22a in the power transmission mechanism 40. The pinion gear 22a has a boss portion 222 integrally formed with a gear body 221. A tooth row 221a is formed on the outer periphery of the gear body 221 at a predetermined module. A fixing hole 223 opens at the center of the pinion gear 22a and is formed so as to penetrate through the centers of the gear body 221 and the boss portion 222. The fixing hole 223 has a perfect circular cross section. A machined flat surface 222a is formed on part of the outer periphery of the boss portion 222. Drilling and tapping are performed from the machined flat surface 222a toward the fixing hole 223, forming a pair of female threaded holes 224a and 224b. The female threaded holes 224a and 224b are machined parallel to each other. A receiving plane 225 is formed on a part of the outer periphery of the rotating shaft 21 , and when the rotating shaft 21 is inserted into the fixing hole 223 , the receiving plane 225 is positioned inside the fixing hole 223 .

[0031] 5, a first fixing screw 44 is threaded into one female threaded hole 224a from the outside of the boss portion 222, and a second fixing screw 45 is threaded into the other female threaded hole 224b from the outside of the boss portion 222. When the first fixing screw 44 and the second fixing screw 45 are tightened, the tips of the fixing screws 44, 45 are pressed against the same receiving flat surface 225 formed on the rotating shaft 21, and the pinion gear 22a is fixed to the rotating shaft 21.

[0032] As shown in FIG. 5, the extension line Os1 of the axis of the first set screw 44 threaded into the female threaded hole 224a and the extension line Os2 of the axis of the second set screw 45 threaded into the female threaded hole 224b are located at positions that do not intersect with the axis center line Or of the rotation shaft 21. That is, the extension line Os1 and the axis center line Or do not intersect at a common point, and the extension line Os2 and the axis center line Or do not intersect at a common point. The extension lines Os1 and Os2 of the two axis centers are parallel to each other. The distance between the axis center line Or and the extension line Os1 of one axis center is L1, and the distance between the axis center line Or and the extension line Os2 of the other axis center is L2. In the cross-sectional view of FIG. 5, the distance L1 is the length of a perpendicular line that starts at the axis center line Or and intersects the extension line Os1 at a right angle. The same is true for the distance L2. The tightening moment (F1 × L1) around the shaft center line Or due to the tightening force F1 of the first set screw 44 and the tightening moment (F2 × L2) around the shaft center line Or due to the tightening force F2 of the second set screw 45 act in opposite directions (counter-rotating) around the shaft center line Or in the cross-sectional view of FIG. 5. Therefore, the pinion gear 22b and the rotating shaft 21 are firmly fixed together. It is preferable that the distance L1 from the shaft center line Or to the extension line Os1 of one shaft core and the distance L2 from the shaft center line Or to the extension line Os2 of the other shaft core be equal. Making the distances L1 and L2 equal minimizes load imbalance when the pinion gear 22a rotates.

[0033] 4, in the power transmission mechanism 40, a pair of pinion gears 22a, 22b are fixed to the rotating shaft 21, but the left (X1 side) pinion gear 22a and the right (X2 side) pinion gear 22b are identical and are oriented symmetrically in the left-right direction (X1-X2 direction). A boss portion 222 is also formed on the right pinion gear 22b, and a first fixing screw 44 and a second fixing screw 45 are threadedly engaged with the boss portion 222, thereby fixing the right pinion gear 22b to the rotating shaft 21. The left and right pinion gears 22a, 22b are firmly fixed to the rotating shaft 21 by the opposite tightening moments of the two fixing screws 44, 45, respectively. Therefore, the strength of the rotation stop is significantly higher than that of a conventional rotation stop that relies on friction, in which a single fixing screw threaded into a gear presses against the outer circumferential surface of the rotating shaft.

[0034] In the embodiment shown in Figure 5, the machining plane 222a is formed at one location on the outer peripheral surface of the boss portion 222, and the receiving plane 225 is also formed at only one location on the outer peripheral surface of the rotating shaft 21, making it easy to machine the rotating shaft 21 and the pinion gears 22a, 22b.

[0035] As shown in FIGS. 1 and 2, the movable display device 1 has a display member 3. The display member 3 has a rectangular case 4, which has a front surface 4a and a back surface 4b. A display panel, such as a liquid crystal display panel or an electroluminescence panel, is housed inside the case 4. The display screen of the display panel is visible on the front surface 4a of the case 4. The case 4 has a rotation support side 4c and a tip portion 4d located on the opposite side from the rotation support side 4c. As shown in FIGS. 3 and 6, the case 4 provided on the display member 3 has rotation connectors 25 formed on both the left and right sides of the rotation support side 4c. Support holes 25a are opened in each of the left and right rotation connectors 25, and the front connector shafts 17 fixed to the slide members 14a and 14b are inserted into the support holes 25a. The support holes 25a are elongated holes extending along an arc. The support hole 25a is constrained by the front connecting shaft 17 and rotates, thereby rotating the display member 3 between the display position and the non-display position. In Figures 1 and 6, the display member 3 is in the display position, with the front surface 4a of the case 4 facing slightly downward forward (in the Y2 direction) and the tip 4d facing downward (in the Z2 direction), which is the direction of gravity. In Figures 2 and 8, the display member 3 is in the non-display position (storage position), with the tip 4d of the case 4 raised upward (in the Z1 direction) and the front surface 4a and back surface 4b being approximately parallel to the horizontal plane (the XY plane).

[0036] As shown in FIG. 1, each of the left-side drive unit 10a and the right-side drive unit 10b is provided with a link mechanism 30 that serves as a switching mechanism. Each link mechanism 30 has a drive link 31 and a driven link 32, which are rotatably connected by a connecting pin 33. As shown in FIG. 3, the drive link 31 is positioned in the gap between the outer slide portion 15 and the inner slide portion 16 of the slide member 14a so as to overlap a cam member 38 (described later). A drive pin 34 that protrudes into the gap is fixed to the inner slide portion 16, and this drive pin 34 is rotatably inserted into a hole 31a that opens at the tip of the drive link 31. When the slide member 14a moves linearly in the front-rear direction, the drive link 31 is rotated, and a slight deviation occurs between the linear movement path of the drive pin 34 in the front-rear direction and the movement path of the hole 31a. To absorb this misalignment, the inner diameter of hole 31a is made slightly larger than the diameter of drive pin 34. Follower pins 35 are fixed to both sides of case 4 of display member 3. Hole 32a opens at the tip of follower link 32, and follower pin 35 is rotatably inserted into hole 32a.

[0037] As shown in FIG. 3, the cam member 38 is positioned between the outer slide portion 15 and the inner slide portion 16 of the slide member 14a. A pair of fixed protrusions 38a projecting to the left (X1 side) are integrally formed on the cam member 38, and each of the fixed protrusions 38a is fixed to the vertical support piece 11a of the bracket 11. When the rotation shaft 21 and the pinion gear 22a rotate, the left and right slide members 14a, 14b move forward and backward. However, because the cam member 38 is fixed to the bracket 11, it does not move with the left and right slide members 14a, 14b. As shown in FIGS. 6 to 8, a guide cam (a guide slot or guide groove) 39 is formed on the cam member 38, and an attitude control protrusion 36 fixed to the rear end (Y1 side) of the drive link 31 is inserted into the guide cam 39. The attitude control protrusion 36 is a sliding pin that slides within the guide cam 39 or a roller that rolls within the guide cam 39. The rear end of the guide cam 39 is a display position guide portion 39a formed parallel to the movement direction of the slide members 14a and 14b, and the front end of the guide cam 39 is a non-display position guide portion 39b formed parallel to the movement direction of the slide members 14a and 14b. Between the display position guide portion 39a and the non-display position guide portion 39b is an inclined guide portion 39c inclined with respect to the movement direction of the slide members 14a and 14b. A cam member 38 is also fixed to the bracket 11 of the right support member 12b. The right cam member 38 is the same as the left cam member 38 fixed to the left support member 12a. The cam member 38 fixed to the left support member 12a and the cam member 38 fixed to the right support member 12b are arranged symmetrically in the left-right direction. A position control protrusion 36 provided on the drive link 31 constituting the right drive unit 10b moves within the guide cam 39 of the right cam member 38.

[0038] <Method of assembling the drive unit and the movable display unit> The left-side drive unit 10a and the right-side drive unit 10b are assembled by connecting the left and right slide members 14a, 14b with the slide connecting member 19, and then assembling the power transmission mechanism 40, link mechanism 30, display member 3, etc. into each slide member 14a, 14b. After that, the left and right slide members 14a, 14b, together with the cam member 38, are assembled into the left-side support member 12a and the right-side support member 12b.

[0039] 9A, 9B, and 9C, the angular phase between at least one of left-side pinion gear 22a and right-side pinion gear 22b constituting power transmission member 40 and rotary shaft 21 can be adjusted. In the adjusting and tightening steps shown in Figures 9A, 9B, and 9C, first fixing screw 44 and second fixing screw 45 of right-side (X2 side) pinion gear 22b are tightly tightened to fix right-side pinion gear 22b to rotary shaft 21, and in this state, the angular phase of left-side (X1 side) pinion gear 22a is adjusted.

[0040] The adjustment process is performed by loosening second set screw 45, which is one of the set screws threaded into pinion gear 22a provided on the left side (X1 side), as shown in Fig. 9A, and then tightening first set screw 44, as shown in Fig. 9B. Pinion gear 22b provided on the right side (X2 side) is firmly fixed to rotating shaft 21 by tightening first set screw 44 and second set screw 45. In addition, as shown in Fig. 4, right-side pinion gear 22b meshes with gear group 43 that is linked to motor 42, and a rotational load and braking force are constantly acting on rotating shaft 21. 9B, when the first set screw 44 of the left pinion gear 22a is tightened and the tip of the first set screw 44 presses against the receiving plane 22a of the rotary shaft 21, the reaction force acts on the pinion gear 22a in the counterclockwise direction, causing the pinion gear 22a to rotate slightly counterclockwise. Because the pinion gear 22a meshes with the rack teeth of the rack member 23, an adjustment force Fa acts on the pinion gear 22a in the forward direction (Y2 direction), causing the left slide member 14a to move slightly forward (Y2 direction) together with the pinion gear 22a. The amount of movement can be adjusted by changing the tightening amount of the first set screw 44. After the adjustment step, in the tightening step shown in FIG. 9C, the second set screw 45 is tightened and the tip of the second set screw 45 presses against the receiving plane 225 of the rotary shaft 21. In this tightening process, the adjusted pinion gear 22b is fixed to the rotary shaft 21. Conversely, when the first fixing screw 44 is loosened in Fig. 9A and the second fixing screw 45 is tightened in Fig. 9B, a clockwise adjustment moment Ma acts on the pinion gear 22a, and the pinion gear 22a and the slide member 14a can be moved backward (in the Y1 direction).

[0041] Furthermore, with the first set screw 44 and the second set screw 45 of the left-side (X1 side) pinion gear 22a tightened to fix the left-side pinion gear 22a to the rotary shaft 21, similar adjustment and tightening processes can be performed on the right-side (X2 side) pinion gear 22b. Because the right-side pinion gear 22b receives a braking force from the drive source 41, loosening one set screw of the right-side pinion gear 22b and adjusting the tightening amount of the other set screw applies an adjustment moment to the rotary shaft 21, causing the rotary shaft 21 to rotate in either direction, which in turn rotates the left-side pinion gear 22a, and moves the left-side slide member 14a forward or backward. Furthermore, if the adjustment process using the set screws is performed on both the left-side pinion gear 22a and the right-side pinion gear 22b, the adjustment movement distance of the slide member 14a can be increased.

[0042] The adjusting and tightening processes can be performed after the assembly of the movable display device 1 is substantially completed by assembling the left-side drive unit 10a, the right-side drive unit 10b, the link mechanism 30, the power transmission mechanism 40, and the display member 3 to the left-side support member 12a and the right-side support member 12b, and with the display member 3 in the display position as shown in FIG. 1 or in the non-display position as shown in FIG. 2. The relative positions of the left-side slide member 14a and the right-side slide member 14b in the front-to-rear direction can be adjusted by adjusting the relative angle between at least one of the left and right pinion gears 22a, 22b and the rotation shaft 21. Because the left-side drive unit 10a and the right-side drive unit 10b are each provided with a link mechanism 30 and a cam member 38, the operating angle of the left and right link mechanisms 30 can be changed by adjusting the relative positions of the left-side slide member 14a and the right-side slide member 14b in the front-to-rear direction. This adjustment makes it possible to set the display member 3 in the display position shown in FIG. 1 or the display member 3 in the non-display position shown in FIG. 2 to an optimum position.

[0043] The adjusting and tightening steps may also be performed after assembling the left-side drive unit 10a and the right-side drive unit 10b to the left-side support member 12a and the right-side support member 12b, but before assembling the link mechanism 30 and the display member 3. In this case, the relative position in the front-to-rear direction between the left-side slide member 14a and the right-side slide member 14b is adjusted by adjusting the relative angle between at least one of the left and right pinion gears 22a, 22b and the rotation shaft 21. After this adjustment, the link mechanism 30, the display member 3, and the like can be assembled.

[0044] <Operation of the movable display device> Next, the operation of the movable display device 1 will be described. 1, 3, and 6, in the left-side drive unit 10a and the right-side drive unit 10b, the slide members 14a, 14b are guided by the fixed rails 13 to the rearmost position (Y1 direction) where they are stopped at the display setting position. At this time, the link mechanism 30 operates to rotate the display member 3 to the display posture, and the case 4 of the display member 3 rotates counterclockwise around the front connecting shaft 17 as a fulcrum, with the tip 4d of the case 4 facing the direction of gravity (Z2 direction). The base members 2a, 2b of the movable display device 1 are fixed to the ceiling of the vehicle interior, etc., and the display screen appearing on the front surface 4a of the case 4 is directed diagonally downward and forward, allowing passengers in the vehicle interior to view the display screen.

[0045] When an operation is performed to switch the display member 3 from the display position to the non-display position, a rotational force is applied to the right pinion gear 22b from the motor 42 of the drive source 41 mounted on the slide member 14b of the right-side drive device 10b. The rotation shaft 21 is driven counterclockwise, and in both the left-side drive device 10a and the right-side drive device 10b, the pinion gears 22a, 22b roll on the rack teeth of the rack member 23, causing the slide members 14a, 14b to move forward (in the Y2 direction). The operation of the drive devices when the slide members 14a, 14b move forward is shown in Figures 6, 7, and 8, respectively. The slide members 14a, 14b are provided with a front connecting shaft 17 that supports the display member 3 and a drive pin 34 connected to the drive link 31, so the display member 3 and the drive link 31 move forward together with the slide members 14a, 14b. During this process, the attitude control protrusion 36 provided on the drive link 31 moves along the inclined guide portion 39c of the guide cam 39, causing the drive link 31 to rotate counterclockwise around the drive pin 34 as a fulcrum. This rotational force is transmitted to the case 4 of the display member 3 via the driven link 32, causing the display member 3 to rotate clockwise around the front connecting shaft 17 as a fulcrum. As shown in Figures 2 and 8, when the slide members 14a and 14b reach the non-display setting position, which is the forward end point of their movement, a position sensor (not shown) detects this and stops the motor, thereby ending the forward movement of the slide members 14a and 14b and causing the display member 3 to assume a substantially horizontal non-display attitude (storage attitude).

[0046] <Other embodiments> 10 and 11 show other embodiments of the fixing structure between the pinion gears 22a, 22b and the rotary shaft 21. In both of the embodiments shown in FIGS. 10 and 11, machined flat surfaces 222b are machined in two locations on the outer circumferential surface of the boss portion 222, and receiving flat surfaces 225a are machined in two locations on the surface of the rotary shaft 21. In FIG. 10, the axes of the first fixing screw 44 and the second fixing screw 45 are disposed at an angle of 0 degrees or more and less than 180 degrees. In FIG. 11, the axes of the first fixing screw 44 and the second fixing screw 45 are disposed at an angle of 180 degrees. In both Figures 10 and 11, the extension line of the axis of the first fixing screw 44 and the extension line of the axis of the second fixing screw 45 do not intersect with the axial center line Or of the rotating shaft 21, and the tightening moment around the axial center line Or due to the tightening force of one fixing screw and the tightening moment around the axial center line Or due to the tightening force of the other fixing screw act in opposite directions to each other.

[0047] In the above embodiment, a link mechanism 30 is used as a switching mechanism for switching the position of the display member 3, but instead of the link mechanism 30, a rotating cam member and an arm that transmits the rotational force of the rotating cam member to switch the position of the display member 3 may be used.

[0048] In the above embodiment, the rotary shaft 21, the pinion gears 22a, 22b, and the drive source 41 are provided on the slide members 14a, 14b, which are the moving side, and the rack member 23 is fixed to the bracket 11, which is the fixed side, but conversely, the rotary shaft 21, the pinion gears 22a, 22b, and the drive source 41 may be provided on the fixed side, such as the base members 2a, 2b or the bracket 11, and the rack member 23 may be fixed to the slide members 14a, 14b, which are the moving side. In this embodiment, when the rotary shaft 21 and the pinion gears 22a, 22b are rotated by the drive source 41, the slide members 14a, 14b move in the front-to-rear direction together with the rack member 23 meshing with the pinion gears 22a, 22b.

[0049] In the above embodiment, the display member 3 is rotatably supported by the slide members 14a and 14b, which are the moving side, but the display member 3 may also be rotatably supported by a fixed side such as the base members 2a and 2b or the bracket 11. In this case, when the slide members 14a and 14b move in the forward and backward directions, the force of the movement operates a switching mechanism such as the link mechanism 30, and the display member 3 is rotated between the display position and the non-display position. [Explanation of symbols]

[0050] 1 Movable display device 2a, 2b Base member 3 Display components 4 cases 4c Rotation support side 4d tip 10a Left drive unit 10b Right side drive 11 Bracket 12a Left side support member 12b Right side support member 14a, 14b Slide members 21 Rotation axis 22a, 22b Pinion gear 23 Rack components 30 Link mechanism (switching mechanism) 34 Drive pin 36 Attitude control protrusion 38 Cam member 39 Guide Cam 40 Power transmission mechanism 41 Drive source 42 Motor 43 Gears 44 First fixing screw 45 Second fixing screw 221 Gear body 222 Boss Section 224a, 224b female threaded holes 225,225a Receiving plane Or axis center line Os1, Os2 shaft extension line

Claims

1. A drive device having a motor and a power transmission mechanism that transmits power of the motor, the power transmission mechanism includes a gear, a rotating shaft inserted through the gear, and two fixing screws threadedly engaged with the gear to press the rotating shaft, and an extension line of the axis of each fixing screw is located at a position that does not intersect with the axial center line of the rotating shaft; a tightening moment about the shaft center line due to the tightening force of one of the fixing screws and a tightening moment about the shaft center line due to the tightening force of the other fixing screw act in opposite directions to each other.

2. 2. The drive device according to claim 1, wherein a receiving plane is formed on the shaft surface of said rotary shaft, and each tip of said two fixing screws abuts against one of said receiving planes.

3. a support member and a slide member movably supported on the support member, 2. The drive device according to claim 1, wherein a rack member extending in the direction of movement of the slide member is fixed to one of the support member and the slide member, and the rotating shaft is rotatably supported on the other, and the gear meshes with the rack member.

4. The drive device according to claim 3; a display member supported so as to be rotatable between a display position and a non-display position; a switching mechanism that rotates the display member toward the display position by a moving force when the sliding member moves in a display setting direction, and rotates the display member toward the non-display position by a moving force when the sliding member moves in a non-display setting direction that is the opposite direction to the display setting direction; A movable display device comprising:

5. A movable display device as described in claim 4, wherein the switching mechanism rotates the display member toward a display position in which the tip end on the side opposite to the rotation support side faces the direction of gravity with a moving force when the sliding member moves to the display setting position, and rotates the display member toward a non-display position in which the tip end is raised with a moving force when the sliding member moves to the non-display setting position.

6. A method for assembling a drive unit having a motor and a power transmission mechanism that transmits power of the motor, comprising the steps of: the power transmission mechanism includes a gear, a rotating shaft inserted into the gear, and two fixing screws threadedly attached to the gear, and an extension line of the axis of each fixing screw is located at a position that does not intersect with the axial center line of the rotating shaft; an adjustment step of abutting a tip of one of the fixing screws against a receiving plane formed on a shaft surface of the rotating shaft and tightening the fixing screw to adjust the relative angle of the gear with respect to the rotating shaft; a tightening process in which a tip of the other fixing screw is brought into contact with a receiving plane formed on the shaft surface of the rotating shaft, and the other fixing screw is tightened so that a tightening moment around the shaft center line due to the tightening force of one fixing screw and a tightening moment around the shaft center line due to the tightening force of the other fixing screw act in opposite directions to fix the gear and the rotating shaft whose relative angle has been adjusted; A method for assembling a drive device, comprising the steps of:

7. a support member and a slide member movably supported on the support member, a rack member extending along the moving direction of the slide member is fixed to one of the support member and the slide member, and the rotation shaft is rotatably supported by the other; 7. The method for assembling a drive unit according to claim 6, wherein the adjusting step and the tightening step are carried out in a state in which the gear is meshed with the rack member.

8. a support member, two slide members movably supported on the support member, and at least two gears fixed to the rotation shaft; a rack member extending along the moving direction of the slide member is fixed to one of the support member and each of the slide members, and the rotation shaft is rotatably supported by the other; 7. The method for assembling a drive unit according to claim 6, wherein the adjusting step and the tightening step are performed for at least one gear and the rotary shaft while each gear is in mesh with the rack.

9. 9. The method for assembling a drive unit according to claim 8, wherein the adjusting step adjusts the relative angle of the gear with respect to the rotation shaft so that the relative positions of the two slide members become appropriate.

10. A method for assembling a movable display device having a display member supported so as to be rotatable between a display position and a non-display position, comprising: a switching mechanism that rotates the display member toward the display position by a moving force when the slide member moves in a display setting direction, and rotates the display member toward the non-display position by a moving force when the slide member moves in a non-display setting direction that is the opposite direction to the display setting direction, 10. A method for assembling a movable display device, comprising the steps of: forming the switching mechanism; and then performing the adjusting step and the fastening step according to the method for assembling a drive device according to claim 6.

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