JP2008164813A - Pedestal of display device including torque limiter device, and torque limiter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pedestal of a display device including a torque limiter device that can suppress play and creaking noise of a transmission gear portion when a torque limiter function operates and prevent the driving source of the transmission gear portion from being used in an overloaded state, and the torque limiter device. <P>SOLUTION: The pedestal 20 of a liquid crystal display 100 (display device) includes the torque limiter device 60 such that the transmission gear portion 41 transmitting driving force of a stepping motor 42 comprises a driven-side gear member 61 having a rotary shaft and a plurality of concentric circular piece portions 61b, a driving side gear member 62 having a gear portion 62b and also has an inner peripheral surface 62a engaged with the side of an outer peripheral surface 61c of the driven-side gear member 61, a coil spring 63 which expands the piece portions 61b of the driven-side gear member 61 outward, and a felt 64 disposed corresponding to the gear portion 62b between the outer peripheral surface 61c and inner peripheral surface 62a so that the driving side gear member 62 and driven-side gear member 61 do not come into contact with each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pedestal of a display device including a torque limiter device and a torque limiter device.

  Conventionally, a torque limiter device applied to a pedestal of a display device including a drive source for turning the display screen portion and a transmission gear portion for transmitting the driving force of the drive source to the turning portion is known ( For example, see Patent Documents 1 to 5).

  In Patent Document 1, a spur gear (gear) is formed on the outer peripheral surface and a gear member formed in an annular shape, and a friction plate is integrally formed at the distal end of a flexible portion extending radially outward. A clutch provided with a clutch mechanism (torque limiter device) that is formed into an annular shape by rounding a flat plate made of metal and a spring that is press-fitted inside the flexible portion of the output shaft member An attached motor is disclosed. In the clutch mechanism of the motor with a clutch described in Patent Document 1, the friction plate of the output shaft member is spread by a spring from the inside of the flexible portion of the output shaft member, and another member is attached to the outer peripheral surface of the friction plate. The gear member is configured to be slidably contacted while applying a predetermined pressing force to the inner peripheral surface of the gear member fitted directly without being interposed.

  Further, in Patent Document 2, a plurality of flexibly deformable fitting portions provided at regular intervals in an annular shape are formed on one end surface of the flange portion, and an output shaft can be connected to the other end surface of the flange portion. A power output member having a flange portion to which a drive shaft of a drive source can be connected to one end face, and a friction member wound around and secured to the outer peripheral surface of a small diameter portion extending in the axial direction from the other end face of the flange portion A torque limiter constituted by an input member and a torsion coil spring fitted to the outer peripheral surface of a fitting portion of a power output member, and a paper feeding device and office equipment using the torque limiter are disclosed. In the torque limiter described in Patent Document 2 and the paper feeding device and office equipment using this torque limiter, the front end portion of the fitting portion of the power output member is directly on the root portion of the small diameter portion of the power input member. And the center portion of the fitting portion of the power output member is tightened toward the shaft center by the torsion coil spring, so that the friction member fixed to the small diameter portion of the power input member is attached. It is configured so as to be slidable while applying a predetermined pressing force.

  Further, in Patent Document 3, a gear (gear) is formed on the outer peripheral surface and a drive gear formed in an annular shape, a winding portion main body is formed between two flange portions, and one flange portion is formed. And a film winding spool having a plurality of arc-shaped projecting pieces extending in the axial direction, and a hook between the arc-shaped projecting pieces of the film winding spool by hook portions at both ends, and the projecting pieces are A clutch structure (torque limiter device) is disclosed which is constituted by an arcuate wire spring member attached so as to surround. In the clutch structure described in Patent Document 3, the peripheral portion (arc portion) of the wire spring member attached to the film winding spool is directly fitted to the inner peripheral surface of the drive gear without passing through other members. At the same time, it is configured to slidably contact the inner peripheral surface of the drive gear while applying a predetermined pressing force using the restoring force of the spring.

  Further, in Patent Document 4, a plurality of divided sleeve pieces are formed on the one end surface of the boss portion in an annular shape with a predetermined interval, and a torque limiter portion to which the roller main body can be connected at the other end surface of the boss portion; A torque limiter and a torque limiter rotating body are disclosed which are composed of a shaft member for rotating a roller main body by a drive source and an elastic body fitted to the outer peripheral surface of the split sleeve piece of the torque limiter portion. In the torque limiter and the torque limiter rotating body described in Patent Document 4, the split sleeve piece of the torque limiter portion is tightened toward the shaft center by the elastic body, and another member is interposed on the inner peripheral surface of the split sleeve piece. Instead, it is configured to slidably contact the outer peripheral surface of the shaft member directly fitted while applying a predetermined pressing force.

  Further, in Patent Document 5, an inner sleeve (inner rotating portion) fixed to a transmission shaft and having a conical friction surface, a timing belt pulley is attached to an outer peripheral surface, and an outer having a conical friction surface. A slip clutch (torque limiter device) is disclosed that includes a sleeve (outer rotating portion) and a flat spring that is arranged so as to be able to press the outer sleeve axially toward the inner sleeve. In the slip clutch described in Patent Document 5, the friction surface of the outer sleeve directly contacts the friction surface of the inner sleeve without passing through other members, and the outer sleeve is against the inner sleeve by the pressing force of the flat spring. And slidably rotate while having a predetermined frictional force.

Patent Registration No. 3272627 JP-A-7-269589 Japanese Patent Laid-Open No. 8-62688 JP 2003-156066 A Japanese Utility Model Publication No. 7-18035

  However, in the clutch mechanism (torque limiter device) described in Patent Document 1, the friction plate of the output shaft member and the inner peripheral surface of the gear member are in direct contact with each other. It is considered that the difference between the static friction coefficient (static friction force) and the dynamic friction coefficient (dynamic friction force) between the friction plate of the output shaft member and the inner peripheral surface of the gear member may increase. In this case, since the inner peripheral surface of the gear member cannot begin to slide smoothly with respect to the friction plate of the output shaft member, a squeaking noise due to friction is generated from the members that are in contact with each other at the start of the sliding. For this reason, the clutch mechanism (torque limiter device) according to Patent Document 1 includes a drive source that turns the display screen unit and a display device that includes a transmission gear unit that transmits the driving force of the drive source to the turn unit ( When applied to a pedestal of a liquid crystal display or the like, for example, there is a problem that rattling or squeaking noise is generated in the driving transmission gear when the torque limiter function is activated. Further, in the clutch mechanism (torque limiter device) of Patent Document 1, since the friction plate and the inner peripheral surface of the gear member are in direct contact with each other, the wear of the members due to sliding, and the contact area due to wear It is considered that the friction coefficient of the friction plate with respect to the inner peripheral surface of the gear member changes with time due to changes in the surface roughness of the friction plate of the output shaft member and the inner peripheral surface of the gear member. For this reason, the slip torque set at the time of manufacture cannot be maintained, and torque control cannot be performed accurately. Therefore, the clutch mechanism (torque limiter device) according to Patent Document 1 includes a display device (for example, a drive source for turning the display screen portion and a transmission gear portion for transmitting the driving force of the drive source to the turn portion (for example, When applied to a pedestal of a liquid crystal display or the like, there is a problem that when the torque limiter function works, the transmission gear unit cannot perform appropriate torque control on the drive source.

  Further, in the torque limiter described in Patent Document 2, the power output member is tightened from the coil spring, and a predetermined region (substantially central portion) from the root portion of the fitting portion of the power output member is a friction member. While the outer peripheral surface of the power input member is pressed, the tip of the fitting portion of the power output member directly contacts the root portion of the small diameter portion of the power input member to which the friction member is fixed, and the contact portion is pressed. In this state, the fitting portion of the power output member is considered to slip while being rubbed with both the friction member and the root portion of the small diameter portion of the power input member. It is done. In this case, the slip torque when the power input member starts to slide relative to the power output member is determined by both the friction member with which the fitting portion of the power output member contacts and the root portion of the small diameter portion of the power input member. Therefore, the slip torque varies, and torque control cannot be performed with high accuracy. Therefore, when the torque limiter according to Patent Document 2 is applied to a pedestal of a display device including a drive source for turning the display screen portion and a transmission gear portion for transmitting the driving force of the drive source to the turn portion. However, when the torque limiter function is activated, there is a problem that the transmission gear unit cannot perform appropriate torque control on the drive source. Further, in the torque limiter described in Patent Document 2, the torque generation source of the drive shaft connected to the power input member has a friction member and a power of the power input member functioning as a torque transmission unit to the power output member. Because it is not arranged near the contact portion with the fitting portion of the output member, it is caused by torsional deformation during rotation of the drive shaft and the power input member between the torque generation source and the torque transmission portion. Thus, it is considered that the drive source may be continuously used in a state where a drive torque greater than the desired slip torque is generated. In this case, the drive source may be used in an overload state. Therefore, when the torque limiter according to Patent Document 2 is applied to a pedestal of a display device including a drive source for turning the display screen portion and a transmission gear portion for transmitting the driving force of the drive source to the turn portion. However, there is a problem that the drive source of the transmission gear unit may be used in an overload state.

  Further, in the clutch structure described in Patent Document 3, since the arc-shaped wire spring member and the inner peripheral surface of the drive gear are in direct contact, depending on the set value of the slip torque, the wire spring member It is considered that there may be a case where the difference between the static friction coefficient (static friction force) and the dynamic friction coefficient (dynamic friction force) between the motor and the inner peripheral surface of the drive gear becomes large. In this case, since the wire spring member cannot begin to slide smoothly with respect to the inner peripheral surface of the drive gear, a squeaking noise due to friction is generated from the members that are in contact with each other at the start of sliding. For this reason, the clutch structure described in Patent Document 3 also has a problem that, like Patent Document 1, when the torque limiter function is operated, rattling or squeaking noise is generated in the driving transmission gear. . Moreover, in the clutch structure of the above-mentioned Patent Document 3, since the peripheral portion of the wire spring member and the inner peripheral surface of the drive gear are in direct contact with each other, the wear of the members due to sliding and the contact area due to wear ( It is considered that the friction coefficient of the wire spring member with respect to the inner peripheral surface of the drive gear changes with time due to a change in the surface roughness of the inner peripheral surface of the drive gear). For this reason, the slip torque set at the time of manufacture cannot be maintained, and torque control cannot be performed accurately. Therefore, also in the clutch structure described in Patent Document 3, as in Patent Document 1, when the torque limiter function operates, the transmission gear unit cannot perform appropriate torque control on the drive source. There is.

  Further, in the torque limiter described in Patent Document 4, since the split sleeve piece of the torque limiter part and the outer peripheral surface of the shaft member are in direct contact, depending on the set value of the slip torque, the torque limiter part It is considered that the difference between the static friction coefficient (static friction force) and the dynamic friction coefficient (dynamic friction force) between the split sleeve piece and the outer peripheral surface of the shaft member may increase. In this case, since the torque limiter portion cannot start to slide smoothly with respect to the outer peripheral surface of the shaft member, a squeaking sound accompanying friction is generated from the members that are in contact with each other at the start of sliding. For this reason, the torque limiter described in Patent Document 4 also has a problem in that rattling or squeaking noise is generated in the driving transmission gear when the torque limiter function is activated, as in Patent Document 1. . Further, in the torque limiter of Patent Document 4, since the split sleeve piece of the torque limiter part and the outer peripheral surface of the shaft member are in direct contact, the wear of the members due to sliding and the contact area due to wear ( It is considered that the friction coefficient with respect to the outer peripheral surface of the shaft member of the torque limiter portion changes with time due to changes in the surface roughness of the divided sleeve pieces of the torque limiter portion and the outer peripheral surface of the shaft member. For this reason, the slip torque set at the time of manufacture cannot be maintained, and torque control cannot be performed accurately. Therefore, the torque limiter described in Patent Document 4 also has a problem that, as in Patent Document 1, when the torque limiter function operates, the transmission gear unit cannot perform appropriate torque control on the drive source. There is.

  Further, in the slip clutch described in Patent Document 5, since the friction surface of the inner sleeve and the friction surface of the outer sleeve are in direct contact, depending on the set value of the slip torque, the friction surface of the inner sleeve It is considered that the difference between the coefficient of static friction and the coefficient of dynamic friction between the outer sleeve and the friction surface of the outer sleeve increases. In this case, since the outer sleeve cannot begin to slide smoothly with respect to the inner sleeve, a squeaking noise accompanying friction is generated from the members at the start of sliding. For this reason, the slip clutch described in Patent Document 5 also has a problem that rattling or squeaking noise is generated in the driving transmission gear when the torque limiter function is activated, as in Patent Document 1. . In the slip clutch of Patent Document 5, the friction surface of the inner sleeve and the friction surface of the outer sleeve are in direct contact with each other. It is considered that the friction coefficient of the friction surface of the inner sleeve with respect to the friction surface of the outer sleeve changes with time due to a change in the surface roughness of the friction region (the friction surfaces of the inner sleeve and the outer sleeve). For this reason, the slip torque set at the time of manufacture cannot be maintained, and torque control cannot be performed accurately. Therefore, the slip clutch described in Patent Document 5 also has a problem that, as in Patent Document 1, when the torque limiter function operates, the transmission gear unit cannot perform appropriate torque control on the drive source. There is.

  The present invention has been made to solve the above problems, and one object of the present invention is that when the torque limiter function is activated, rattling or squeaking noise is generated in the driving transmission gear portion. Torque limiter capable of suppressing occurrence and performing appropriate torque control on the drive source and avoiding the situation where the drive source of the transmission gear unit is used in an overload state It is to provide a pedestal of a display device including the device and a torque limiter device.

Means for Solving the Problems and Effects of the Invention

  A display device pedestal according to a first aspect of the present invention is a display device pedestal comprising: a drive source for turning the display screen portion; and a transmission gear portion for transmitting the driving force of the drive source to the turning portion. The transmission gear portion includes a plurality of pieces provided concentrically with the rotation shaft, a driven gear member having a first gear portion, a second gear portion, and an inner peripheral surface of the driven gear member. A drive-side gear member fitted to the outer peripheral surface side of the portion, and a press-fitted into the inner peripheral surface of one portion of the driven-side gear member by reducing the winding diameter of the coil from an unloaded state. On the second gear part of the driving gear member between the outer peripheral surface of the one part of the driven gear member and the inner peripheral surface of the driving gear member. And a friction member disposed at a corresponding position, and a driving side gear member The driven gear member includes a torque limiter device that is disposed so as to face each other through a friction member without contacting each other, and the annular spring member of the torque limiter device is a second gear of the driving gear member. The driving force by the second gear portion of the driving side gear member at the position of the inner peripheral surface of the one side portion of the driven side gear member corresponding to the region where the portion and the friction member are disposed is one piece via the friction member. Is arranged at the position where the pressing force by the spring member acts on the action line transmitted to the motor, and at the tip of one part of the driven gear member of the torque limiter device, the pulling out of the driving gear member to one side is suppressed. A retaining portion for integrally holding the driven side gear member, and a retaining piece portion for preventing the driving side gear member from coming off to the other side is driven between the plurality of one side portions of the driven side gear member. Provided integrally with the side gear member

  In the pedestal of the display device according to the first aspect, as described above, the transmission gear portion is a friction that is disposed between the outer peripheral surface of one portion of the driven gear member and the inner peripheral surface of the driving gear member. By configuring to include a torque limiter device having a member, the inner peripheral surface of the driving side gear member is pressed from the driven side gear member via the friction member, so that the driving side gear member has a slip torque higher than the slip torque. When a driving torque is generated, the difference between the static frictional force and the dynamic frictional force in the contact state between the inner peripheral surface of the driving side gear member and the friction member is small. You can begin to slide smoothly. Therefore, when the torque limiter function is activated, it is possible to suppress the occurrence of rattling in the transmission gear portion that is being driven. Further, by configuring the transmission gear portion to include a torque limiter device having a friction member disposed between the outer peripheral surface of one part of the driven gear member and the inner peripheral surface of the driving gear member, In order for the driving-side gear member to start to slide smoothly by the friction member, the squeaking noise generated at the beginning of slipping when the driving-side gear member and the driven-side gear member are in direct contact inside the transmission gear portion is suppressed. be able to. Further, by configuring the transmission gear portion to include a torque limiter device having a friction member disposed between the outer peripheral surface of one part of the driven gear member and the inner peripheral surface of the driving gear member, Unlike the case where the driving gear member and the driven gear member are in direct contact with each other, the friction member protects the inner peripheral surface of the driving gear member from frictional wear. The change with time of the friction coefficient with respect to the member is suppressed. Therefore, since the slip torque set at the time of manufacture can be maintained, the transmission gear part can perform appropriate torque control with respect to a drive source. Further, by configuring the transmission gear portion to include a torque limiter device that arranges the driving side gear member and the driven side gear member so as to face each other through the friction member without contacting each other, the spring member The portion of the driven gear member that is spread outwardly presses the inner peripheral surface of the driving gear member only through the friction member, so that the friction coefficient between the friction member and the driving gear member is Only by this, the slip torque is determined. Therefore, since only the friction member is involved in the friction, it is possible to prevent the transmission gear unit from controlling the torque accurately and appropriately with respect to the driving source by suppressing the variation in the set value of the slip torque for each product. It can be carried out. Further, by configuring the friction member to be disposed at a position corresponding to the second gear portion of the driving side gear member, the driving torque generated in the second gear portion of the driving side gear member immediately passes through the friction member. Since it is transmitted to the driven gear member, the driving gear member can transmit the driving force from the driving source to the driven gear member without causing unnecessary torsional deformation. Therefore, it is possible to avoid a situation where the drive source that drives the transmission gear unit is used in an overload state that involves a torque that is greater than or equal to the desired slip torque.

  In the pedestal of the display device according to the first aspect, the spring member of the torque limiter device is disposed on one of the portions of the driven gear member corresponding to the region where the second gear portion and the friction member of the driving gear member are disposed. The driving force by the second gear portion of the driving side gear member is arranged at a position on the peripheral surface and at a position where the pressing force by the spring member acts on the action line transmitted to the one portion via the friction member. Since the pressing force of the spring member toward the outer side of the one side portion of the driven side gear member can be applied to the inner peripheral surface of the driving side gear member most strongly via the friction member, the spring member The restoring force (elastic energy) can be used efficiently. Further, the spring member is an annular coil spring, and the spring member is configured to be press-fitted into the inner peripheral surface of one part of the driven gear member by reducing the coil winding diameter from an unloaded state. By using the restoring force (elastic energy) that restores the spring shape to the unloaded state from the state where the coil spring is press-fitted into the inner peripheral surface of the one part of the driven gear member, the piece of the driven gear member can be easily A pressing force for spreading the portion outward can be obtained.

  Further, the pedestal of the display device according to the first aspect is configured such that the distal end portion of the one side portion of the driven side gear member integrally includes a retaining portion for suppressing the detachment of the driving side gear member to one side. Thus, even when the driving side gear member rotates at a predetermined driving torque or more and slippage occurs due to the friction member on the outer peripheral surface of one side of the driven side gear member, the retaining portion of the driven side gear member is moved to the driving side. By coming into contact with the gear member, it is possible to easily prevent the driving side gear member from dropping from the driven side gear member to one side of the driving side gear member. Further, by configuring the driven side gear member so as to integrally include a retaining piece portion for suppressing the removal of the driven side gear member to the other side between the plurality of pieces of the driven side gear member, Even when the driving side gear member rotates at a predetermined driving torque or more and slippage occurs due to the friction member on the outer peripheral surface of one side of the driven side gear member, the retaining piece portion of the driven side gear member becomes the driving side gear member. By abutting, it is possible to easily suppress the driving side gear member from dropping from the driven side gear member to the other side of the driving side gear member.

  A pedestal of a display device according to a second aspect of the present invention includes a drive source for turning the display screen portion, and a transmission gear portion for transmitting the driving force of the drive source to the turning portion. A driven gear member having a plurality of pieces concentrically provided with the shaft, a first gear portion, a second gear portion, and an inner peripheral surface on the outer peripheral surface side of the one portion of the driven gear member. The driving-side gear member to be fitted, the spring member that is disposed on the inner peripheral surface of one part of the driven-side gear member, and pushes the one-side part of the driven-side gear member outward, and the outer periphery of the one part of the driven-side gear member A friction member disposed at a position corresponding to the second gear portion of the driving gear member between the surface and the inner peripheral surface of the driving gear member, and the driving gear member and the driven gear member are Torque limits arranged so as to face each other through the friction member without contacting each other Including the equipment.

  In the pedestal of the display device according to the second aspect, as described above, the transmission gear portion is a friction disposed between the outer peripheral surface of the one portion of the driven gear member and the inner peripheral surface of the driving gear member. By configuring to include a torque limiter device having a member, the inner peripheral surface of the driving side gear member is pressed from the driven side gear member via the friction member, so that the driving side gear member has a slip torque higher than the slip torque. When a driving torque is generated, the difference between the static frictional force and the dynamic frictional force in the contact state between the inner peripheral surface of the driving side gear member and the friction member is small. You can begin to slide smoothly. Therefore, when the torque limiter function is activated, it is possible to suppress the occurrence of rattling in the transmission gear portion that is being driven. Further, by configuring the transmission gear portion to include a torque limiter device having a friction member disposed between the outer peripheral surface of one part of the driven gear member and the inner peripheral surface of the driving gear member, In order for the driving-side gear member to start to slide smoothly by the friction member, the squeaking noise generated at the beginning of slipping when the driving-side gear member and the driven-side gear member are in direct contact inside the transmission gear portion is suppressed. be able to. Further, by configuring the transmission gear portion to include a torque limiter device having a friction member disposed between the outer peripheral surface of one part of the driven gear member and the inner peripheral surface of the driving gear member, Unlike the case where the driving gear member and the driven gear member are in direct contact with each other, the friction member protects the inner peripheral surface of the driving gear member from frictional wear. The change with time of the friction coefficient with respect to the member is suppressed. Therefore, since the slip torque set at the time of manufacture can be maintained, the transmission gear part can perform appropriate torque control with respect to a drive source. Further, by configuring the transmission gear portion to include a torque limiter device that arranges the driving side gear member and the driven side gear member so as to face each other through the friction member without contacting each other, the spring member The portion of the driven gear member that is spread outwardly presses the inner peripheral surface of the driving gear member only through the friction member, so that the friction coefficient between the friction member and the driving gear member is Only by this, the slip torque is determined. Therefore, since only the friction member is involved in the friction, it is possible to prevent the transmission gear unit from controlling the torque accurately and appropriately with respect to the driving source by suppressing the variation in the set value of the slip torque for each product. It can be carried out. Further, by configuring the friction member to be disposed at a position corresponding to the second gear portion of the driving side gear member, the driving torque generated in the second gear portion of the driving side gear member immediately passes through the friction member. Since it is transmitted to the driven gear member, the driving gear member can transmit the driving force from the driving source to the driven gear member without causing unnecessary torsional deformation. Therefore, it is possible to avoid a situation where the drive source that drives the transmission gear unit is used in an overload state that involves a torque that is greater than or equal to the desired slip torque.

  In the pedestal of the display device according to the second aspect, preferably, the spring member of the torque limiter device is a piece of the driven gear member corresponding to a region where the second gear portion of the driving gear member and the friction member are disposed. At a position where the pressing force by the spring member acts on the line of action where the driving force by the second gear portion of the driving side gear member is transmitted to the one portion via the friction member. Has been. If comprised in this way, since the pressing force to the outer side direction of the one part of the driven side gear member by a spring member can be most strongly acted on the internal peripheral surface of a driving side gear member via a friction member, The restoring force (elastic energy) of the member can be used efficiently.

  In the pedestal of the display device according to the second aspect, preferably, the spring member is an annular coil spring, and the spring member is a piece of the driven-side gear member by reducing the winding diameter of the coil from an unloaded state. It is press-fitted into the inner peripheral surface of the. If comprised in this way, a coil spring will be easily driven by using the restoring force (elastic energy) which restores a spring shape to a no-load state from the state where it was press-fitted into the inner peripheral surface of one part of the driven gear member. A pressing force for spreading the one part of the side gear member outward can be obtained.

  In the pedestal of the display device according to the second aspect described above, preferably, the distal end portion of the one portion of the driven gear member integrally includes a retaining portion for suppressing the removal of the driving gear member to one side. With this configuration, even when the driving side gear member rotates at a predetermined driving torque or more and slippage occurs due to the friction member on the outer peripheral surface of one side of the driven side gear member, the retaining portion of the driven side gear member By abutting on the driving side gear member, it is possible to easily prevent the driving side gear member from dropping from the driven side gear member to one side of the driving side gear member.

  In the pedestal of the display device according to the second aspect, preferably, the driven side gear member is provided between a plurality of pieces of the driven side gear member to suppress the removal of the driven side gear member to the other side. The retaining piece is integrally included. According to this structure, even when the driving side gear member rotates at a predetermined driving torque or more and slippage occurs due to the friction member on the outer peripheral surface of one side of the driven side gear member, the retaining piece of the driven side gear member When the portion abuts on the driving side gear member, the driving side gear member can be easily prevented from dropping from the driven side gear member to the other side of the driving side gear member.

  In the pedestal of the display device according to the second aspect, preferably, the driven side gear member is provided between a plurality of pieces of the driven side gear member and integrally includes a seat portion for holding the spring member. If comprised in this way, since the movement to the other side of a spring member is suppressed by the seat part, the press-fitted spring member can be reliably arrange | positioned on the internal peripheral surface of the one part of a driven side gear member. .

  In the pedestal of the display device according to the second aspect, preferably, the driven gear member is provided on the inner peripheral side of the distal end portion of one portion of the driven gear member, and suppresses the spring member from being pulled out to one side. Integrally including a protrusion for the purpose. If comprised in this way, since the movement to the one side of a spring member is suppressed by the projection part of a driven side gear member, the press-fitted spring member is one side from the internal peripheral surface of the one part of a driven side gear member. It is possible to easily suppress falling off to the side.

  In the pedestal of the display device according to the second aspect, preferably, a plurality of pieces of the driven gear member are concentrically arranged in a predetermined angle range, and the retaining piece portion and the seat are disposed between the pieces. The parts are arranged alternately. If comprised in this way, since the driven side gear member can provide the piece part which has a different function concentrically, a securing piece part, and a seat part integrally, a driven side gear member is a driving side gear member. In addition, both the spring member and the spring member can be stably arranged.

  A torque limiter device according to a third aspect of the present invention includes a driven gear member including a plurality of pieces provided concentrically with a rotating shaft, a first gear portion, a second gear portion, and an inner periphery. A driving gear member whose surface is fitted on the outer peripheral surface side of the one part of the driven gear member and an inner peripheral surface of the one part of the driven gear member are arranged to push the one part of the driven gear member outward. And a friction member disposed at a position corresponding to the second gear portion of the driving gear member between the outer peripheral surface of one portion of the driven gear member and the inner peripheral surface of the driving gear member. The driving side gear member and the driven side gear member are arranged so as to face each other through the friction member without contacting each other.

  In the torque limiter device according to the third aspect, as described above, the friction limiter is arranged between the outer peripheral surface of the one part of the driven gear member and the inner peripheral surface of the driving gear member. As a result, the inner peripheral surface of the driving side gear member is pressed against the driven side gear member via the friction member, so that when the driving torque exceeding the slip torque is generated in the driving side gear member, the driving side gear Since the difference between the static friction force and the dynamic friction force in the contact state between the inner peripheral surface of the member and the friction member is small, the driving side gear member can start to slide smoothly with respect to the driven side gear member. Further, by providing a friction member disposed between the outer peripheral surface of one part of the driven gear member and the inner peripheral surface of the driving gear member, the driving gear member can be made smoother by the friction member. In order to start slipping, it is possible to suppress a squeaking sound that occurs at the start of slipping when the driving side gear member and the driven side gear member are in direct contact with each other. Moreover, by comprising the friction member arrange | positioned between the outer peripheral surface of the one part of a driven side gear member, and the internal peripheral surface of a driving side gear member, a driving side gear member and a driven side gear member, Unlike the case where they are in direct contact with each other, the friction member protects the inner peripheral surface of the driving side gear member from frictional wear, so that the change in the friction coefficient of the driving side gear member with respect to the friction member is suppressed over time. The Therefore, since the slip torque set at the time of manufacture can be maintained, torque control can be performed accurately. In addition, the driven side gear member and the driven side gear member are arranged so as to be opposed to each other via the friction member without contacting each other, so that the driven side gear is expanded outward by the spring member. Since the one part of the member presses the inner peripheral surface of the driving gear member only through the friction member, the slip torque is determined only by the friction coefficient between the friction member and the driving gear member. Therefore, since only the friction member is involved in the friction, it is possible to perform the torque control more accurately by suppressing the variation of the set value of the slip torque from product to product. Further, by configuring the friction member to be disposed at a position corresponding to the second gear portion of the driving side gear member, the driving torque generated in the second gear portion of the driving side gear member immediately passes through the friction member. Since it is transmitted to the driven gear member, the driving gear member can transmit the driving force from the driving source to the driven gear member without causing unnecessary torsional deformation. Therefore, it can be avoided that the drive source for driving the transmission gear unit is used in an overload state in which a torque exceeding the desired slip torque is involved.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing an overall configuration of a liquid crystal display provided with a pedestal including a torque limiter device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the liquid crystal display according to the embodiment shown in FIG. FIG. 3 is a plan view of a base on which the torque limiter device according to the embodiment shown in FIG. 1 is provided. 4 to 13 are views showing the detailed structure of the torque limiter device and the pedestal provided with the torque limiter device according to the embodiment of the present invention shown in FIG. First, with reference to FIGS. 1-13, the structure of the base 20 provided with the torque limiter apparatus 60 and the torque limiter apparatus 60 by one Embodiment of this invention is demonstrated. In the present embodiment, a case where the present invention is applied to a pedestal of a liquid crystal display which is an example of a display device will be described.

  As shown in FIG. 1, a liquid crystal display 100 according to an embodiment of the present invention includes a display main body 10 and a predetermined angle (in this embodiment, the display main body 10 in the horizontal direction (arrow A direction and B direction) in a horizontal plane. And a pedestal 20 that can be rotated by ± 30 degrees and tilted by a predetermined angle (± 10 degrees in this embodiment) in the vertical direction (arrow C direction and D direction). The display body 10 is an example of the “display screen unit” in the present invention.

  Further, as shown in FIG. 3, the pedestal 20 includes a display screen support mechanism 50 that supports the display main body 10, and the display main body 10 that is supported by the display screen support mechanism 50 in the horizontal direction (arrows in FIG. A turning portion 30 for turning in the A direction and the B direction) and a drive portion 40 including a plurality of drive gears provided for turning a turning plate 31 described later.

  Further, as shown in FIG. 3, the swivel unit 30 includes a sheet metal swivel plate 31 to which a display screen support mechanism 50 (see FIG. 2) is attached on the upper surface, and a plurality of (24 in this embodiment) steel inside. A resin holding member (not shown) for disposing the balls (not shown) at predetermined intervals (15-degree interval in the present embodiment) and holding the steel balls together with the turning plate 31, and the turning plate It is comprised from the base 32 made from a sheet metal which hold | maintains 31 so that rotation is possible. Further, when the turning plate 31 is turned, a stopper member (not shown) provided inside the turning portion 30 is used to horizontally extend up to 30 degrees in the horizontal direction (arrow A direction and B direction in FIG. 1). It is comprised so that it may be controlled by the turning range.

  Further, as shown in FIG. 3, the drive unit 40 includes a transmission gear unit 41 for rotating the swivel plate 31 on the swivel unit 30 in the left-right direction (the directions of arrows A and B in FIG. 1) in the horizontal plane. The stepping motor 42 is a driving source of the transmission gear unit 41. Moreover, the drive part 40 is comprised so that it may be arrange | positioned inside the turning part 30, as shown in FIG. As shown in FIG. 3, the transmission gear unit 41 includes a resin gear 43, a torque limiter device 60, a resin gear 44, and a resin gear 45 arranged in a resin gear box 46. It is configured to be. The torque limiter device 60 transmits the driving force of the stepping motor 42 to the turning plate 31 via the transmission gear portion 41 when the driving force of the stepping motor 42 is equal to or less than a predetermined driving torque. Can be turned inside the pedestal 20, while the driving force of the stepping motor 42 is not transmitted to the turning plate 31 when the driving force of the stepping motor 42 exceeds a predetermined driving torque. It is comprised so that it may have. The stepping motor 42 is an example of the “drive source” in the present invention.

  Here, in the present embodiment, as shown in FIGS. 6 and 7, the torque limiter device 60 includes a resin driven gear member 61, a resin driving gear member 62, and a metal coil spring 63. The felt 64 is formed in an annular shape. The coil spring 63 and the felt 64 are examples of the “spring member” and the “friction member” of the present invention, respectively.

  In the present embodiment, as shown in FIG. 7, the driven gear member 61 is concentric with the gear portion 61 a and extends in parallel with the axial direction of the rotation shaft 600 (indicated by a one-dot chain line). The eight piece portions 61 b (in this embodiment) are provided integrally with the driven gear member 61. That is, the piece portions 61b are provided at eight places at equal angular intervals of 45 degrees. The gear portion 61a is an example of the “first gear portion” in the present invention. As shown in FIG. 7, a strip-shaped felt 64 is wound around the outer circumferential surface 61c of the driven gear member 61 once in the circumferential direction and an adhesive (in this embodiment, a double-sided tape (FIG. (Not shown)). As shown in FIG. 6, the felt 64 has an end portion 64 a disposed between the adjacent one portions 61 b of the driven side gear member 61, and the felt 64 includes the eight pieces 61 b of the driven side gear member 61. Both are configured to be connected on the outer peripheral surface 61c.

  Further, in this embodiment, as shown in FIGS. 6 and 7, when the driving gear member 62 is slid in the direction of arrow P (upward) from below the driven gear member 61, the driving gear described later is used. The inner peripheral surface 62a of the member 62 is concentrically fitted to the driven gear member 61 by contacting the felt 64 fixed around the outer peripheral surface 61c of the piece 61b of the driven gear member 61. Is configured to be possible. As shown in FIG. 7, when the coil spring 63 is press-fitted from above the driven gear member 61 while reducing the winding diameter in the direction of arrow Q (downward), the outer surface of the coil spring 63 is moved to the driven gear member 61. By abutting on the inner peripheral surface 61d of the one piece portion 61b, the piece portion 61b of the driven side gear member 61 is radially expanded toward the outside, and as shown in FIG. The piece portion 61 b is configured to press the inner peripheral surface 62 a of the driving side gear member 62 fitted in advance through the felt 64.

  In the present embodiment, as shown in FIG. 8, the position where the felt 64 abuts against the inner peripheral surface 62 a of the driving gear member 62 in the assembled state of the torque limiter device 60 is the driving gear member 62. It is comprised so that it may become a position corresponding to the gear part 62b mentioned later provided in the outer peripheral side. The gear portion 62b is an example of the “second gear portion” in the present invention. In this case, as shown in FIG. 8, the coil spring 63 has a region corresponding to the outer peripheral surface 61 c in the portion of the inner peripheral surface 61 d of the piece 61 b of the driven gear member 61 where the felt 64 is fixed. It arrange | positions so that it may press toward. Therefore, as shown in FIG. 8, the driving side gear member 62 including the coil spring 63, the felt 64, and the gear portion 62 b is arranged radially on the action line 350 (indicated by a one-dot chain line) on which the pressing force of the coil spring 63 acts. It is configured to be arranged side by side.

  Further, in the present embodiment, as shown in FIGS. 10 and 11, a retaining portion 61e that extends in the horizontal direction from the distal end portion of the piece portion 61b of the driven side gear member 61 toward the outer peripheral surface 61c side of the piece portion 61b. It is formed integrally with the piece 61b. As shown in FIG. 8, when the driving side gear member 62 is fitted to the driven side gear member 61, the retaining portion 61e is brought into contact with the retaining portion 61e by the one side surface 62c of the driving side gear member 62. The driving-side gear member 62 has a function of preventing the driven-side gear member 61 from coming out of the driven-side gear member 61 in the arrow P direction (upward direction). Further, as shown in FIGS. 10 and 12, between the adjacent piece 61b (see FIG. 10) and the piece 61b (see FIG. 10) of the driven side gear member 61, the rotary shaft 600 (1 in FIG. 12) is provided. Plural (in this embodiment, four) retaining piece portions 61f that extend slightly outward and obliquely upward from the axial direction (shown by a dotted line) are integrally provided with the driven gear member 61. That is, the retaining pieces 61f are provided at four locations concentrically at equal angular intervals of 90 degrees. As shown in FIG. 9, when the driving-side gear member 62 is fitted to the driven-side gear member 61, the retaining piece portion 61f is configured such that the other side surface 62d of the driving-side gear member 62 comes into contact with the retaining piece portion 61f. Thus, the driving side gear member 62 has a function of preventing the driven side gear member 61 from falling off in the arrow Q direction (downward direction). As shown in FIGS. 8 and 9, the driving side gear member 62 is driven by the retaining portion 61 e (see FIG. 8) and the retaining piece portion 61 f (see FIG. 9) of the driven side gear member 61. The position of the axial direction (arrow P direction and arrow Q direction) fitted to the outer peripheral surface 61c of the piece part 61b via the felt 64 is positioned.

  Further, in the present embodiment, as shown in FIGS. 10 and 12, the rotation shaft 600 is disposed between the adjacent piece 61 b (see FIG. 10) and the piece 61 b (see FIG. 10) of the driven gear member 61. A plurality of (four in this embodiment) seat portions 61g extending in parallel with the axial direction (indicated by a one-dot chain line in FIG. 12) are provided integrally with the driven gear member 61. That is, the seat portions 61g are provided at four locations concentrically at equal angular intervals of 90 degrees. As shown in FIG. 9, when the coil spring 63 is press-fitted into the driven gear member 61, the seat portion 61g holds the coil spring 63 by the one side surface 63a of the coil spring 63 coming into contact with the seat portion 61g. The coil spring 63 has a function of suppressing movement in the arrow Q direction (downward direction). Further, as shown in FIG. 11, a protruding portion 61 h is formed integrally with the piece portion 61 b so as to protrude toward the inner peripheral surface 61 d side of the distal end portion of the piece portion 61 b of the driven gear member 61. 8, when the coil spring 63 is press-fitted into the driven gear member 61, the other side surface 63b of the coil spring 63 comes into contact with the protruding portion 61h, so that the coil spring 63 is driven by the driven gear. It has a function of preventing the member 61 from coming out in the direction of arrow P (upward). As shown in FIGS. 8 and 9, the coil spring 63 is made to be a piece 61b of the driven gear member 61 by the seat 61g (see FIG. 9) and the protrusion 61h (see FIG. 8) of the driven gear member 61. The state of being press-fitted into the inner peripheral surface 61d is maintained. Further, as shown in FIG. 10, the retaining piece 61f and the seat 61g of the driven side gear member 61 are arranged between the adjacent piece 61b and the piece 61b, respectively, and the retaining piece 61f and the seat 61g. Are arranged alternately.

  Further, as shown in FIG. 13, the resin-made driving side gear member 62 has a hollow shape, an inner peripheral surface 62a that abuts the outer peripheral surface 61c of the driven side gear member 61 via a felt 64, and an outer peripheral side. A gear portion 62b for generating a driving torque, a first side surface 62c, and a second side surface 62d are integrally provided.

  Further, in the present embodiment, as shown in FIG. 8, the driving side gear member 62 of the torque limiter device 60 is pressed from the driven side gear member 61 and the felt 64 with a pressing force preset by a coil spring 63. Further, a driving torque greater than the frictional force between the inner peripheral surface 62 a of the driving side gear member 62 and the felt 64 on the driven side gear member 61 due to the pressing force of the coil spring 63 is generated on the driving side gear member 62. In this case, the inner peripheral surface 62 a of the driving side gear member 62 and the felt 64 on the side of the driven side gear member 61 cause a slip, so that all the driving torque of the driving side gear member 62 is transferred to the driven side gear member 61. It is configured not to be transmitted. On the other hand, the driving side gear member 62 is rotated by a driving torque less than the frictional force between the inner peripheral surface 62a of the driving side gear member 62 and the felt 64 on the driven side gear member 61 due to the pressing force of the coil spring 63. In this case, the inner peripheral surface 62a of the driving gear member 62 and the felt 64 of the driven gear member 61 do not slide with each other, and the rotation (driving torque) of the driving gear member 62 is directly applied to the driven gear member 61. Configured to communicate.

  Further, as shown in FIG. 4, a resin worm gear 47 is press-fitted into the rotating shaft of the stepping motor 42. As shown in FIGS. 4 and 5, the gear 43 integrally includes a large-diameter gear portion 43a and a small-diameter gear portion 43b. The gear 44 integrally includes a large-diameter gear portion 44a and a small-diameter gear portion 44b. The gear 45 integrally includes a large-diameter gear portion 45a and a small-diameter gear portion 45b. As shown in FIGS. 3 and 4, a resin-made turning gear member 48 is fixed to the upper surface of the turning plate 31 by screws 70. In FIG. 4, in order to explain the configuration of the transmission gear unit 41, the gear box 46 (see FIG. 3) for disposing the transmission gear unit 41 and the stepping motor 42 inside is omitted from the drawing.

  4 and 5, the worm gear 47 is meshed with the large-diameter gear portion 43a of the gear 43 so that the rotation axis is orthogonal, and the small-diameter gear portion 43b of the gear 43 is a torque limiter. The rotation shaft is meshed in parallel with the gear portion 62b (see FIG. 5) of the driving side gear member 62 of the device 60. As shown in FIGS. 4 and 5, the gear portion 61 a (see FIG. 5) of the driven gear member 61 of the torque limiter device 60 is meshed in parallel with the large-diameter gear portion 44 a of the gear 44. In addition, the small-diameter gear portion 44b of the gear 44 is meshed with the large-diameter gear portion 45a of the gear 45 in parallel with the rotation shaft. As shown in FIGS. 4 and 5, the small-diameter gear portion 45 b of the gear 45 is meshed with the turning gear portion 48 a of the turning gear member 48 in parallel with the rotation shaft. 4 and 5, the driving force of the stepping motor 42 is transmitted via the worm gear 47, the gear 43, the torque limiter device 60, the gear 44, the gear 45, and the swivel gear member 48. It is configured to be transmitted to the swivel plate 31.

  Further, as shown in FIG. 2, the display screen support mechanism 50 is fixed to the upper surface of the swivel plate 31 of the swivel unit 30 provided on the pedestal 20 by four screws 70. As shown in FIG. The display main body 10 can be rotated in the vertical direction (arrow C direction and D direction) with respect to the pedestal 20, and the display main body 10 is perpendicular to the pedestal 20 in the vertical direction (arrow C direction and D direction). It is configured so that it can be supported in a tilted state.

  2 and 3, the display screen support mechanism 50 includes a sheet metal display screen support member 51, a pair of vertical support members 52, a sheet metal plate-like support shaft 53, and a sheet metal product. , A metal disc spring 55 (four in this embodiment), sheet metal pressure contact plates 56 and 57, and a plate member 58 that contacts the metal disc spring 55. The display screen support member 51 is attached to the pair of vertical support members 52 so as to be rotatable at a predetermined driving torque or more.

  Further, as shown in FIG. 2, the sheet metal display screen support member 51 integrally includes a display main body attaching portion 51 a and a pair of rotating portions 51 b. In addition, four screw insertion holes 51 c are provided in the display body mounting portion 51 a of the display screen support member 51. Further, the pair of rotating portions 51b of the display screen support member 51 are provided so as to extend in the vertical direction with respect to the surface of the display body mounting portion 51a from both side ends of the display body mounting portion 51a.

  Further, as shown in FIGS. 2 and 3, each of the pair of vertical support members 52 includes a rotation member attachment portion 52a and a rotation portion attachment portion 52b. In addition, four screw mounting holes 52c (see FIG. 3) are provided in the rotating member mounting portion 52a of the vertical support member 52. Moreover, the rotation part attachment part 52b of the vertical support member 52 is provided so that it may extend in the orthogonal | vertical direction upwards from the one end part of the rotation member attachment part 52a with respect to the surface of the rotation member attachment part 52a.

  As shown in FIGS. 1 and 2, the display main body 10 includes a resin front cabinet 11 and a resin rear cabinet 12. In addition, a liquid crystal module (not shown) to which a liquid crystal panel (not shown) is attached is surrounded by the front cabinet 11 and the rear cabinet 12 inside the display body 10. Further, the display main body 10 is attached to the display screen support member 51 by tightening a screw 70 in a screw attachment hole (not shown) through the screw insertion hole 51 a of the display screen support member 51. Further, the rear cabinet 12 is integrally provided with a notch 12a for covering and disposing the display screen support member 51. In addition, a plurality of screw insertion holes 12 b (seven locations in the present embodiment) are provided in the outer peripheral portion of the rear cabinet 12, and are configured to be attached to the front cabinet 11 by screws 80. Further, as shown in FIG. 2, a short-shaped recess 12d is formed in the side surface portion 12c of the rear cabinet 12, and a plurality of through holes 12e are formed in the recess 12d. The plurality of through holes 12e are provided for connecting cables from an AV terminal (not shown) connected to a control board (not shown) for controlling the liquid crystal module 13 to an external device of the display body 10. It has been.

  Further, as shown in FIGS. 1 and 2, a resin cover member 21 is attached to the pedestal 32 of the turning unit 30 from the lower surface side of the pedestal 32 by screws (not shown). As shown in FIGS. 1 and 2, the resin cover member 22 covers the turning part 30 from above and in the left-right direction (directions of arrows A and B in FIG. 1) together with the turning plate 31 of the turning part 30. It is attached so that it can turn. As shown in FIGS. 1 and 2, the resin cover member 22 is provided with a notch 22 a into which the display screen support mechanism 50 is inserted.

  14 and 15 are diagrams for explaining the turning operation of the pedestal provided with the torque limiter device according to the embodiment of the present invention shown in FIG. With reference to FIG. 1, FIG. 3, FIG. 4, FIG. 14, and FIG. 15, the turning operation in the horizontal direction in the horizontal plane of the pedestal 20 provided with the torque limiter device 60 according to the present embodiment will be described.

  First, as shown in FIG. 3, the display screen support member 51 is perpendicular to the turning portion 30 on the pedestal 20 and the display screen support member 51 faces the front (the turning gear portion 48a of the turning gear member 48). When the user presses an auto-turn button (not shown) of the attached remote controller (not shown) from a state where the central portion of the gear is engaged with the small-diameter gear portion 45b of the gear 45, the display main body 10 (FIG. 1) is pressed. A signal for turning the right side (see FIG. 1 in the direction of arrow A) is transmitted to a control circuit unit (not shown) of the display body 10. Based on this signal, the stepping motor 42 of the base 20 is driven. Specifically, as shown in FIG. 3, as the stepping motor 42 is driven, the worm gear 47 attached to the stepping motor 42 is rotated in the direction of arrow E1 (see FIG. 4), and the gear 43 is It is rotated in the direction of arrow E2 (see FIG. 14). Then, the driving side gear member 62 of the torque limiter device 60 is rotated through the gear 43 in the direction of arrow E3. Then, the driven gear member 61 of the torque limiter device 60 is rotated in the direction of arrow E3, and the gear 44 is rotated in the direction of arrow E4 (see FIG. 14). Further, when the gear 45 is rotated in the direction of arrow E5 (see FIG. 14), the turning gear member 48 is rotated in the direction of arrow E6. Accordingly, as shown in FIG. 14, the turning unit 30 to which the display screen support member 51 is attached starts turning in the arrow G1 direction, so that the display main body 10 (see FIG. 1) is in the arrow A direction (see FIG. 1). Start turning to).

  Then, as shown in FIG. 14, the turning unit 30 on which the display main body 10 is placed continues to turn in the arrow A direction (see FIG. 1) at a predetermined rotational speed.

  Then, when the display body 10 is turned to an angle desired by the user, the user releases the auto-turn button (not shown) of the attached remote controller (not shown) to release the display body 10 (FIG. 1). A signal for turning the right side (see FIG. 1 in the direction of arrow A in FIG. 1) is not transmitted to the control circuit unit (not shown) of the display body 10. Accordingly, the driving of the stepping motor 42 is stopped. Thereby, the turning unit 30 stops turning in the direction of the arrow G1 at a position as shown in FIG.

  Further, in a state where the turning operation of the display main body 10 (see FIG. 1) in the direction of arrow A (see FIG. 1) is continued by the user, the turning angle of the turning unit 30 is maximum (30 degrees in the present embodiment). In this case, the swivel plate 31 abuts against a stopper member (not shown) provided inside the swivel unit 30 to restrict the swiveling operation in the direction of arrow A (see FIG. 1). Therefore, the turning unit 30 stops at the position shown in FIG. 15 and stops turning in the direction of the arrow G1. At this time, since the stepping motor 42 (see FIG. 15) continues to be driven, the driving torque transmitted from the stepping motor 42 (see FIG. 15) is the worm gear 47 (see FIG. 15) and the gear 43 (see FIG. 15). Is transmitted to the driving side gear member 62 (see FIG. 15) of the torque limiter device 60 (see FIG. 15).

  Here, in the present embodiment, the driven gear member 61 is pressed against the driving gear member 62 via the felt 64 with a pressing force set in advance by the coil spring 63, and therefore the pressing force of the coil spring 63. When a driving torque greater than the frictional force between the felt 64 on the driven gear member 61 side and the inner peripheral surface 62a of the driving gear member 62 is generated on the driving gear member 62, the driving gear The driving torque of the driving gear member 62 is not transmitted to the driven gear member 61 by causing the inner peripheral surface 62a of the member 62 and the felt 64 on the driven gear member 61 side to slide in the rotational direction. That is, when the swivel plate 31 comes into contact with a stopper member (not shown) provided inside the swivel unit 30, the driven gear member 61, the gear 44, the gear 45, and the swivel gear member 48 are driven-side gears. The rotation is stopped regardless of the rotation of the member 62.

  Although the above-described turning operation has been described for turning the turning unit 30 in the direction of the arrow G1 shown in FIG. 14, the torque limiter device 60 is also used in the turning operation in the direction of the arrow H1 opposite to the direction of the arrow G1. Performs the rotation operation (torque limiter function) similar to the above, thereby turning the turning portion 30 in the arrow H1 direction, and the display body 10 (see FIG. 1) in the left direction (arrow B direction in FIG. 1). It is turned.

  In the present embodiment, as described above, the transmission gear portion 41 includes the felt 64 disposed between the outer peripheral surface 61 c of the piece portion 61 b of the driven side gear member 61 and the inner peripheral surface 62 a of the driving side gear member 62. Since the inner peripheral surface 62a of the driving side gear member 62 is pressed from the driven side gear member 61 via the felt 64, the driving side gear member 61 is contacted with the driving side gear member 61. When a driving torque greater than the slip torque is generated, the difference between the static friction force and the dynamic friction force in the contact state between the inner peripheral surface 62a of the driving side gear member 62 and the felt 64 is small. Smooth sliding with respect to the driven gear member 61 can be started. Therefore, when the torque limiter function of the torque limiter device 60 works, each gear member constituting the transmission gear portion 41 (particularly, a plurality of gear members arranged between the stepping motor 42 and the driving side gear member 62) It is possible to suppress driving while rattling. Further, the transmission gear portion 41 includes a torque limiter device 60 having a felt 64 disposed between the outer peripheral surface 61 c of the piece portion 61 b of the driven side gear member 61 and the inner peripheral surface 62 a of the driving side gear member 62. By configuring as described above, the driving side gear member 62 starts to slip smoothly by the felt 64, so that the slipping in the case where the driving side gear member 62 and the driven side gear member 61 are in direct contact inside the transmission gear portion 41. It is possible to suppress the stagnation sound that occurs at the beginning.

  In this embodiment, the transmission gear portion 41 is a torque having a felt 64 disposed between the outer peripheral surface 61 c of the piece portion 61 b of the driven gear member 61 and the inner peripheral surface 62 a of the driving gear member 62. Unlike the case where the driving side gear member 62 and the driven side gear member 61 are in direct contact, the inner peripheral surface 62a of the driving side gear member 62 is formed by the felt 64 by including the limiter device 60. Since it is protected from wear due to friction, a change with time of the friction coefficient with respect to the felt 64 of the driving side gear member 62 is suppressed. Therefore, since the slip torque set at the time of manufacture can be maintained, the transmission gear part 41 can perform appropriate torque control with respect to the stepping motor 42. FIG. Further, the transmission gear portion 41 is configured to include a torque limiter device 60 that arranges the driving side gear member 62 and the driven side gear member 61 so as to face each other through the felt 64 without contacting each other. The piece portion 61b of the driven side gear member 61 that is spread outward by the coil spring 63 presses the inner peripheral surface 62a of the driving side gear member 62 only through the felt 64, so that the felt 64 and the driving side gear are pressed. The slip torque is determined only by the coefficient of friction with the member 62. Therefore, since only the felt 64 is involved in the friction, it is possible to prevent the transmission gear portion 41 from appropriately adjusting the torque to the stepping motor 42 with high accuracy by suppressing the variation in the slip torque setting value for each product. Control can be performed.

  In this embodiment, the felt 64 is arranged at a position corresponding to the gear portion 62b of the driving gear member 62, so that the driving torque generated in the gear portion 62b of the driving gear member 62 is immediately generated. Since it is transmitted to the driven gear member 61 via the felt 64, the driving gear member 61 can transmit the driving force from the stepping motor 42 to the driven gear member 61 without causing unnecessary torsional deformation or the like. . Therefore, it is possible to suppress the stepping motor 42 that drives the transmission gear unit 41 from being used in an overload state that involves a torque that is greater than or equal to the desired slip torque.

  Further, in the present embodiment, the coil spring 63 of the torque limiter device 60 is used for the inner peripheral surface 61c of the piece portion 61b of the driven gear member 61 corresponding to the region where the gear portion 62b of the driving gear member 62 and the felt 64 are disposed. And the driving force by the gear portion 62b of the driving side gear member 62 is pushed by the coil spring 63 on the action line 350 (one-dot chain line in FIG. 6) transmitted to the piece portion 61b via the felt 64. By being arranged at the position where the pressure acts, the pressing force of the coil spring 63 toward the outer side of the piece 61b of the driven side gear member 61 is applied to the inner peripheral surface of the driving side gear member 62 via the felt 64. Since it can be made to act most strongly on 62a, the restoring force (elastic energy) of the coil spring 63 can be utilized efficiently.

  Further, in the present embodiment, the spring member incorporated in the torque limiter device 60 is an annular coil spring 63, and the coil spring 63 is configured so that the coil winding diameter can be reduced from a no-load state, thereby reducing the driven gear member 61. By configuring so that the coil spring 63 is press-fitted into the inner peripheral surface 61d of the piece 61b, the spring shape is restored to the unloaded state from the state in which the coil spring 63 is press-fitted into the inner peripheral surface 16d of the piece 61b of the driven gear member 61. By using the restoring force (elastic energy), it is possible to easily obtain a pressing force for pushing the piece 61b of the driven gear member 61 outward.

  Further, in the present embodiment, the leading end portion of the piece portion 61b of the driven side gear member 61 is integrally provided with a retaining portion 61e for preventing the driving side gear member 62 from coming off in the arrow P direction (see FIG. 7). With this configuration, even when the driving side gear member 62 rotates at a predetermined driving torque or more and slips on the outer peripheral surface 61c of the piece 61b of the driven side gear member 61, the driven side gear member 61 is prevented from being removed. When the portion 61e contacts the one side surface 62c of the driving gear member 62, the driving gear member 62 can be easily prevented from dropping in the direction of arrow P (see FIG. 8) from the driven gear member 61. .

  Further, in the present embodiment, the driven gear member 61 is configured to prevent the driving gear member 62 from coming off in the arrow Q direction (see FIG. 7) between the plurality of pieces 61 b of the driven gear member 61. Even when the driving-side gear member 62 rotates at a predetermined driving torque or more and slips on the outer peripheral surface 61c of the driven-side gear member 61 by including the retaining piece portion 61f integrally. When the retaining piece 61f of the driven side gear member 61 contacts the other side surface 62d of the driving side gear member 62, the driving side gear member 62 falls off from the driven side gear member 61 in the arrow Q direction (see FIG. 9). Can be easily suppressed.

  In the present embodiment, the driven gear member 61 is configured so as to integrally include a seat portion 61g for holding the coil spring 63 between the plurality of pieces 61b of the driven gear member 61. Since the movement of the coil spring 63 in the arrow Q direction (see FIG. 9) is suppressed by the seat portion 61g, the coil spring 63 can be reliably disposed on the inner peripheral surface 61d of the piece portion 61b of the driven gear member 61.

  Further, in the present embodiment, the driven gear member 61 is prevented from coming out in the direction of arrow P (see FIG. 7) of the coil spring 63 on the inner peripheral surface 61d side of the distal end portion of the piece 61b of the driven gear member 61. Since the protrusion 61h of the driven gear member 61 is configured to integrally include the protrusion 61h for the movement, the movement of the coil spring 63 in the direction of arrow P (see FIG. 8) is suppressed. It is possible to easily suppress 63 from dropping from the inner peripheral surface 61d of the piece 61b of the driven gear member 61 in the direction of arrow P (see FIG. 8).

  In the present embodiment, eight pieces 61b of the driven gear member 61 are concentrically arranged at equal intervals of 45 degrees, and the retaining piece portion 61f and the seat portion 61g are provided between the piece portions 61b. By being configured to be provided alternately (each at four locations), the driven-side gear member 61 has a piece portion 61b, a retaining piece portion 61f, and a seat portion 61g having different functions in a concentric manner. Since the driven gear member 61 can be provided, the driving gear member 62 and the coil spring 63 can be stably disposed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, an example in which the present invention is applied to a pedestal of a liquid crystal display as an example of a display device has been described. However, the present invention is not limited thereto, and a display screen (display) other than a liquid crystal panel such as an organic EL panel (display) It can also be applied to a pedestal of a display device having a panel.

  In the above embodiment, the example in which the present invention is applied to the operation when the display body 10 is swung in the horizontal direction in the horizontal plane with respect to the pedestal 20 together with the swivel plate 31 is shown, but the present invention is not limited thereto. The display main body 10 and the display screen support mechanism 50 can also be applied to an operation when turning (tilting operation) in the front-rear direction in a vertical plane with respect to the pedestal 20.

  Moreover, in the said embodiment, although the torque limiter apparatus 60 showed the example which attached the felt 64 to the outer peripheral surface 61c of the piece part 61b of the driven side gear member 61 with the double-sided tape as a friction member, this invention is not limited to this. Alternatively, for example, short fiber compounded rubber other than felt may be attached to the outer peripheral surface 61c of the piece 61b of the driven side gear member 61 using, for example, an adhesive other than double-sided tape and double-sided tape.

  Moreover, in the said embodiment, in the torque limiter apparatus 60, although the example which press-fits the coil spring 63 as a spring member to the internal peripheral surface 61d of the piece part 61b of the driven side gear member 61 was shown, this invention is not limited to this, A spring member formed in an annular shape by rounding, for example, a metal flat plate other than the coil spring may be configured to be press-fitted into the inner peripheral surface 61d of the piece portion 61b of the driven gear member 61.

  Moreover, in the said embodiment, although the example which provided the piece part 61b of the driven side gear member 61 by the equal angle space | interval of 45 degree | times was shown in the torque limiter apparatus 60, this invention is not limited to this, A driven side The pieces 61b of the gear member 61 do not have to be provided at equiangular intervals, and may be other than eight.

  Moreover, in the said embodiment, although the torque-limiter apparatus 60 showed the example which provided the retaining piece part 61f, the seat part 61g, and the projection part 61h of the driven side gear member 61 in four places at equal angular intervals, respectively. However, the retaining piece 61f, the seat 61g, and the protrusion 61h may not be provided at equiangular intervals, and the number may be other than four.

  Moreover, although the example which made the some gear member which comprises the transmission gear part 41 resin was shown in the said embodiment, this invention is not restricted to this, For example, transmission gears by metal gear members other than resin are used. You may make it comprise a part.

1 is a perspective view showing an overall configuration of a liquid crystal display provided with a pedestal including a torque limiter device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the liquid crystal display according to the embodiment shown in FIG. 1. FIG. 2 is a plan view of a pedestal provided with a torque limiter device according to the embodiment shown in FIG. 1. It is a perspective view for demonstrating the structure of the transmission gear part in which the torque limiter apparatus by one Embodiment shown in FIG. 1 was provided. It is a figure for demonstrating the arrangement | positioning relationship of the gear of the transmission gear part in which the torque limiter apparatus by one Embodiment shown in FIG. 1 was provided. It is a top view of the torque limiter device by one Embodiment shown in FIG. FIG. 2 is an exploded view of the torque limiter device according to the embodiment shown in FIG. 1. It is sectional drawing along the 200-200 line | wire of FIG. It is sectional drawing along the 300-300 line of FIG. It is a top view of the driven gear of the torque limiter apparatus by one Embodiment shown in FIG. It is sectional drawing along the 400-400 line of FIG. It is sectional drawing along the 500-500 line | wire of FIG. It is a top view of the drive side gear of the torque limiter apparatus by one Embodiment shown in FIG. It is a figure for demonstrating the turning operation | movement of the display main body by one Embodiment shown in FIG. It is a figure for demonstrating the turning operation | movement of the display main body by one Embodiment shown in FIG.

Explanation of symbols

10 Display body (display screen)
20 pedestal 30 turning part 41 transmission gear part 42 stepping motor (drive source)
60 Torque limiter device 61 Drive side gear member 61a Gear part (first gear part)
61b piece 61c outer circumference 61d inner circumference 61e retaining part 61f retaining piece 61g seat 61h projection 62 driving side gear member 62a inner circumference 62b gear part (second gear part)
63 Coil spring (spring member)
64 felt (friction member)

Claims (10)

In the pedestal of the display device provided with a drive source for turning the display screen part,
A transmission gear portion for transmitting the driving force of the driving source to the turning portion;
The transmission gear portion is
A driven-side gear member having a plurality of pieces provided concentrically with the rotation shaft, and a first gear portion;
A driving-side gear member having a second gear portion and having an inner peripheral surface fitted to the outer peripheral surface side of the one-side portion of the driven-side gear member;
From an annular coil spring that is press-fitted into the inner peripheral surface of the piece of the driven gear member by reducing the winding diameter of the coil from an unloaded state, and pushes the piece of the driven gear member outward. A spring member,
A friction member disposed at a position corresponding to the second gear portion of the driving side gear member between the outer peripheral surface of the one part of the driven side gear member and the inner peripheral surface of the driving side gear member; Have
The driving side gear member and the driven side gear member include a torque limiter device disposed so as to face each other via the friction member without contacting each other,
The annular spring member of the torque limiter device has an inner peripheral surface of the piece portion of the driven gear member corresponding to a region where the second gear portion and the friction member of the driving gear member are disposed. And at a position where the pressing force by the spring member acts on the line of action where the driving force by the second gear portion of the driving gear member is transmitted to the piece portion via the friction member. And
At the tip of the one part of the driven side gear member of the torque limiter device, a retaining portion for preventing the driving side gear member from coming off to one side is provided integrally with the driven side gear member. ,
Between the plurality of pieces of the driven-side gear member, a retaining piece for preventing the driving-side gear member from coming off to the other side is provided integrally with the driven-side gear member. The pedestal of the device. A drive source for turning the display screen,
A transmission gear part for transmitting the driving force of the driving source to the turning part,
The transmission gear portion is
A driven-side gear member having a plurality of pieces provided concentrically with the rotation shaft, and a first gear portion;
A driving-side gear member having a second gear portion and having an inner peripheral surface fitted to the outer peripheral surface side of the one-side portion of the driven-side gear member;
A spring member that is disposed on the inner peripheral surface of the one piece of the driven gear member and that pushes the piece of the driven gear member outward.
A friction member disposed at a position corresponding to the second gear portion of the driving side gear member between the outer peripheral surface of the one part of the driven side gear member and the inner peripheral surface of the driving side gear member; Have
The pedestal of the display device, including a torque limiter device arranged so that the driving side gear member and the driven side gear member face each other through the friction member without contacting each other.   The spring member of the torque limiter device is at a position of the inner peripheral surface of the piece portion of the driven gear member corresponding to a region where the second gear portion and the friction member of the driving gear member are disposed. And it arrange | positions in the position where the pressing force by the said spring member acts on the action line by which the driving force by the said 2nd gear part of the said drive side gear member is transmitted to the said one part via the said friction member. The pedestal of the display device according to claim 2. The spring member is an annular coil spring,
The pedestal of the display device according to claim 2 or 3, wherein the spring member is press-fitted into an inner peripheral surface of the one part of the driven gear member by reducing a coil winding diameter from an unloaded state.   The distal end portion of the one portion of the driven gear member integrally includes a retaining portion for suppressing the detachment of the driving gear member to one side. Display pedestal.   The driven-side gear member is provided between the plurality of pieces of the driven-side gear member, and integrally includes a retaining piece for suppressing the detachment of the driving-side gear member to the other side. The base of the display apparatus of any one of 2-5.   The driven side gear member is provided between the plurality of pieces of the driven side gear member, and integrally includes a seat portion for holding the spring member. The pedestal of the display device described.   The driven gear member is provided on the inner peripheral side of the tip portion of the piece of the driven gear member, and integrally includes a protrusion for suppressing the spring member from being pulled out to the one side. The pedestal of the display device according to any one of claims 2 to 7.   The plurality of pieces of the driven gear member are concentrically arranged in a predetermined angle range, and the retaining pieces and the seats are alternately arranged between the pieces. Item 9. A display device base according to any one of Items 2 to 8. A driven gear member including a plurality of pieces provided concentrically with the rotation shaft, and a first gear portion;
A driving-side gear member including a second gear portion and having an inner peripheral surface fitted to the outer peripheral surface side of the one-side portion of the driven-side gear member;
A spring member that is disposed on the inner peripheral surface of the one piece of the driven gear member and that pushes the piece of the driven gear member outward.
A friction member disposed at a position corresponding to the second gear portion of the driving side gear member between the outer peripheral surface of the one part of the driven side gear member and the inner peripheral surface of the driving side gear member; Prepared,
The torque limiter device, wherein the driving gear member and the driven gear member are arranged so as to face each other through the friction member without contacting each other.

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