JP2008020023A - Torque transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque transmission device which can always achieve smooth rotary drive although the same can be constructed at low cost without requiring sophisticated design and working on a drive gear and an inner teeth of a floating pulley in belt drive type torque transmission devices having inner gearing of the drive gear and inner teeth provided on an inner circumference of the ring shape tooth floating pulley and winding timing belt around the tooth floating pullet and a tooth driven pulley in a driven side. <P>SOLUTION: Concentric cylindrical support wheels 22 are provided on axial direction both sides of an external teeth 20 of a drive gear 8. Rolling wheels 23 touching the support wheel of the drive gear are provided on axial direction both sides of the inner teeth 21 of the tooth floating pulley 9. The external teeth 20 of the drive gear and the inner teeth 21 of the tooth floating pulley are established to prevent bottoming under a condition where the support wheel 22 and the rolling wheel 23 touch. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotational force transmission device, and more particularly to a rotational force transmission device for transmitting rotational force with a pulley and a timing belt.

  Conventionally, a plurality of movable shelves having wheels that are driven to rotate manually are arranged so as to be movable along rails laid in a direction perpendicular to the entrance / exit surfaces, and the movement of the movable shelves There are various types of manual moving shelf devices in which a passage having a predetermined width is formed. Then, a user operates an operation handle provided on the front surface of each movable shelf, and a fixed force is arranged between predetermined movable shelves or at a side end portion by rotating a wheel through a drive transmission system with a rotational force of the operation handle. A passage is formed between the shelf and the movable shelf, and a user enters the passage, and articles such as books and files are taken in and out from the entrance / exit face facing the passage.

  In Patent Document 1, in a cart of a moving shelf, a rotating shaft of a wheel and a power shaft that is manually rotated are linked by a reduction mechanism, and a large-diameter sprocket is fixed to a front end portion of the power shaft. A small-diameter sprocket is linked to the drive shaft of the operation handle provided in the middle stage of the front panel of the moving shelf, a chain is wound around both sprockets, and the wheel is rotated in the same direction as the rotation by rotating the operation handle. It is structured to be moved. Here, when a chain is used, since there is almost no expansion and contraction, a tension device for adjusting the tension of the chain is provided at an intermediate position between the two sprockets in order to surely engage with the sprocket.

  On the other hand, in the rotational force transmission mechanism consisting of a toothed pulley and a timing belt, the timing belt expands and contracts due to the tension. In addition, consideration must be given to the follow-up to the elongation of the timing belt at the initial stage of rotational driving. As a mechanism for solving these problems, a mechanism described in Patent Document 2 has been proposed in a bicycle drive mechanism. That is, in Patent Document 2, an internal tooth provided on the inner periphery of a ring-shaped toothed idler pulley is internally meshed with a drive gear that rotates integrally with a crankshaft, and the idler pulley and a driven tooth are provided. A mechanism in which a timing belt is wound around a driven pulley is disclosed. In this case, if tension is applied to the timing belt via the idler pulley that meshes with the drive gear with internal teeth, the idler pulley moves eccentrically toward the side where the tension of the timing belt is small, and the balance of tension is automatically adjusted. The problem of tooth skipping can be solved without using a tension device.

However, since the drive gear and the ring-shaped toothed idler pulley are internally meshed with the inner teeth of the idler pulley, the drive gear and the inner teeth of the idler pulley are intimately engaged, and the inner and outer teeth are bottomed. Thus, smooth rotation is hindered, and when the torque of the drive gear at the initial stage of rotation is large, the rotation is meshed more strongly and becomes lumpy. In order to eliminate this, a high gear shape design and a high degree of machining are required, resulting in high costs.
JP 2002-101973 A Japanese Patent Publication No. 58-47592

  Therefore, in view of the above-described situation, the present invention intends to solve the problem that the drive gear is internally meshed with the inner teeth provided on the inner periphery of the ring-shaped toothed idle pulley, and the toothed idle pulley and the driven gear are driven. In a belt-driven rotational force transmission device in which a timing belt is wound around a toothed driven pulley on the side, advanced design and processing are not required for the internal teeth of the drive gear and the idle pulley, and it can be configured at low cost. Regardless, the present invention is to provide a rotational force transmission device that can always achieve a smooth rotational drive.

  In order to solve the above-mentioned problems, the present invention internally meshes an inner tooth provided on the inner periphery of a ring-shaped toothed idler pulley with a drive gear, and the toothed idler pulley and a driven toothed driven pulley. In the belt drive type rotational force transmission device in which the timing belt is wound around, both coaxial axial support wheels are provided on both axial sides of the external teeth of the drive gear, and both axial sides of the internal teeth of the toothed pulley are provided. Provided with a rolling wheel that contacts the support wheel of the drive gear so that the outer teeth of the drive gear and the inner teeth of the toothed idler pulley do not bottom out when the support wheel and the rolling wheel are in contact with each other. A rotational force transmission device characterized in that it is set is configured (claim 1).

  Here, the diameter of the support wheel of the drive gear is set smaller than the diameter of the root circle of the external tooth, and the inner diameter of the rolling ring of the toothed idler pulley is set smaller than the diameter of the tip circle of the internal tooth. (Claim 2).

  Specifically, one of the rolling wheels of the toothed idler pulley is formed integrally with the inner teeth in the ring-shaped main body, and the other rolling ring is detachably screwed to the main body. It is preferably formed on the inner periphery of the plate (claim 3).

  Furthermore, it is more preferable that the outer peripheral portion of the flange plate protrudes radially outward from the meshing portion of the timing belt formed on the outer periphery of the main body portion, and the outer peripheral protruding portion serves as a stopper for the timing belt. Claim 4).

  In the rotational force transmission device according to the first aspect of the present invention as described above, the drive gear is internally meshed with the inner teeth provided on the inner periphery of the ring-shaped toothed idle pulley, and the toothed idle pulley and the driven side are engaged. This is a belt drive system in which a timing belt is wound around a toothed driven pulley, and the idle pulley moves eccentrically to the side where the tension of the timing belt is small, and the tension balance is automatically adjusted. This eliminates the problem of tooth skipping even when not used, and provides support wheels provided in the form of coaxial cylinders on both axial sides of the external teeth of the drive gear and rolling wheels provided on both axial sides of the internal teeth of the toothed idler pulley. Since the outer teeth of the drive gear and the inner teeth of the toothed idle pulley are not bottomed in contact with the driving wheel, the design and processing of the drive gear and the inner teeth of the idle pulley are advanced. Is Not determined, despite the inexpensive constructed is always smooth rotational driving can be achieved.

  According to claim 2, the diameter of the support wheel of the drive gear is set smaller than the root diameter of the outer tooth, and the inner diameter of the rolling ring of the toothed idler pulley is larger than the diameter of the tip circle of the inner tooth. By setting it small, the outer teeth of the drive gear are sandwiched from both sides in the axial direction by both rolling wheels of the toothed idler pulley, so that the outer side of the drive gear can be removed even if the toothed idler pulley is not connected to any member. The state in which the teeth and the inner teeth of the toothed idler pulley mesh with each other can be stably maintained, and the processing of the drive gear is easy.

  According to the third aspect, one of the rolling wheels of the toothed idler pulley is formed integrally with the inner teeth in the ring-shaped main body, and the other rolling ring is detachably screwed to the main body. Since it formed in the inner peripheral part of a flange board, the process of the internal tooth of a toothed floating pulley becomes easy.

  According to the fourth aspect, the outer peripheral portion of the flange plate protrudes radially outward from the meshing portion of the timing belt formed on the outer periphery of the main body portion, and the outer peripheral protruding portion serves as a stopper for the timing belt. In addition to easy processing of the meshing part of the main body, it is possible to stably maintain the state where the timing belt is wound and meshed with the meshing part of the outer periphery of the toothed idler pulley, and the flange plate is removed. Since the timing belt can be engaged with the meshing portion of the main body, the operation of the timing belt is facilitated.

  Next, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings. FIG. 1 is an overall perspective view of a manual moving shelf adopting a rotational force transmission device according to the present invention, FIGS. 2 to 8 show an outline of the rotational force transmission device, in which 1 is a moving shelf, 2 is a rail, 3 is a passage, 4 is a driving wheel, 5 is a driven wheel, 6 is an operation handle, 7 is a rotational force transmission device, 8 is a driving gear, 9 is a toothed idler pulley, 10 is a toothed driven pulley, 11 is a timing belt, Reference numeral 12 denotes a bidirectional clutch mechanism.

  First, as shown in FIGS. 1 to 3, the manual moving shelf according to the present invention is configured such that a plurality of moving shelves 1 are arranged so as to be movable along a plurality of rails 2,. By relatively moving 1, a passage 3 having a predetermined width is formed between them. And the drive wheel 4 and the single or several driven wheel 5 are provided in the position corresponding to each rail 2, ... at the lower end of the movement shelf 1, and the rotational force of the operation handle 6 provided in the front middle stage of the movement shelf 1 is the said. A rotational force transmission device 7 for transmitting to the drive wheel 4 is provided, and the rotational force transmission device 7 is driven by the drive gear 8, the toothed idle pulley 9 inscribed in the drive gear 8, the toothed driven pulley 10, and the timing when both pulleys are struck. It consists of a belt 11. Further, the rotational force of the operation handle 6 is transmitted to the drive gear 8 via the bidirectional clutch mechanism 12.

  More specifically, the movable shelf 1 is provided with a driving wheel 4 that is manually driven to rotate on a carriage 13 and a driven wheel 5 having the same diameter as the driving wheel 4, and a plurality of columns 14,. A storage unit 16 having a normal structure in which shelf plates 15 are held in multiple stages is provided, and a front panel 17 is provided at least on the front side of the storage unit 16. The operation handle 6 is provided in the middle of the front panel 17, the drive gear 8 is connected to the shaft portion of the operation handle 6 via the bidirectional clutch mechanism 12, and the toothed driven pulley 10 is It is provided at the front end of the carriage 13. Here, the bidirectional clutch mechanism 12 and the rotational force transmission device 7 are located on the back surface of the front panel 17. A power shaft 18 is fixed to the toothed driven pulley 10, and a rotating shaft 19 is fixed to the drive wheel 4. The power shaft 18 and the rotating shaft 19 are composed of sprockets and chains having different numbers of teeth. They are linked by a reduction mechanism (not shown).

  And the rotational force transmission apparatus 7 which concerns on this invention was provided in the outer periphery of the said drive gear 8 on the inner periphery of the said ring-shaped idle pulley 9 as shown in FIGS. This is a belt driving system in which the internal teeth 21 are inscribed and meshed, and the timing belt 11 is wound around the toothed idler pulley 9 and the driven toothed driven pulley 10. In the present invention, coaxial cylindrical support wheels 22 and 22 are provided on both axial sides of the external teeth 20 of the drive gear 8, and the drive gears are provided on both axial sides of the internal teeth 21 of the toothed idler pulley 9. 8 is provided with rolling wheels 23 and 23 that come into contact with the support wheels 22, 22, and the outer teeth 20 of the drive gear 8 and the toothed play in the state where the support wheels 22 and 22 are in contact with the rolling wheels 23 and 23. The inner teeth 21 of the pulley 9 are set so as not to bottom.

  More specifically, the diameter of the support wheel 22 of the drive gear 8 is set to be smaller than the diameter of the root circle of the outer tooth 20, and the inner diameter of the rolling wheel 23 of the toothed idler pulley 9 is the tooth of the inner tooth 21. It is set smaller than the tip circle diameter.

  Specifically, each of the toothed idler pulleys 9 is composed of a ring-shaped main body portion 24 and a flange plate 25 that is detachably screwed to the main body portion 24. The ring-shaped main body 24 is formed integrally with the inner teeth 21, and the other rolling wheel 23 is formed on the inner peripheral portion of the flange plate 25. In addition, a meshing portion 26 that meshes with the timing belt 11 is formed on the outer periphery of the main body portion 24, and the flange plate 25 is screwed to the main body portion 24. Projecting outward in the radial direction from the meshing portion 26 of the portion 24, the outer peripheral protruding portion 27 serves as a stopper for the timing belt 11.

  In the present embodiment, the main body portion 24 is formed on one side in the axial direction with respect to the outer teeth 20, and one rolling wheel 23 is formed on the inner peripheral portion, and the protruding edge 28 for preventing the timing belt 11 from coming off on the outer peripheral portion. Is forming. Further, the flange plate 26 is formed with the rolling wheel 23 on the inner peripheral portion and the outer peripheral protruding portion 27 on the outer peripheral portion. The flange plate 26 is coaxial with the external teeth 20 of the main body 24 on the other side in the axial direction, and is connected to each other by a plurality of screws 29,. Constitute.

  Then, the toothed idler pulley 9 is inscribed in the drive gear 8 so that the external teeth 20 of the drive gear 8 are sandwiched between both rolling wheels 23 and 23 from both axial sides. In this state, both rolling wheels 23 and 23 of the toothed idle pulley 9 are in contact with both support wheels 22 and 22 of the drive gear 8 and the outer teeth 20 of the drive gear 8 and the toothed idle pulley 9 The teeth 21 are meshed so that they do not bottom. Here, “no bottom” means that the tooth tip of the inner tooth 21 does not contact the tooth bottom of the outer tooth 20 and the tooth tip of the outer tooth 20 does not contact the tooth bottom of the inner tooth 21. is doing.

  In this way, the timing belt 11 is wound around the toothed idler pulley 9 and the toothed driven pulley 10 with the toothed idler pulley 9 inscribed in the drive gear 8. Therefore, when the operation handle 6 is rotated, the toothed idler pulley 9 is rotationally driven by the drive gear 8 in an idle state, and the toothed idler pulley 10 is rotated from the toothed idler pulley 9 via the timing belt 11. is there. At this time, the toothed idler pulley 9 is eccentrically moved from the center line connecting the shaft of the drive gear 8 and the toothed driven pulley 10 to the feed side by applying a force from the pulling side of the timing belt 11 to the feed side. To do. If it does so, the tension | tensile_strength by the side of feeding of the said timing belt 11 will increase, and, thereby, a tooth jump will be prevented between the meshing parts of a pulley. When the toothed driven pulley 10 rotates, the power shaft 18 rotates in the same rotational direction as the operation handle 6, and the rotating shaft 19 and the drive wheel 4 rotate in the same rotational direction via a speed reduction mechanism. Thus, the movable shelf 1 is moved in the same direction. That is, when the operation handle 6 is rotated clockwise, the movable shelf 1 moves rightward, and when the operation handle 6 is rotated counterclockwise, the movable shelf 1 moves leftward.

  Actually, the rotational force transmission device 7 is configured by attaching components other than the toothed driven pulley 10 to the support plate 30 attached to the support posts 14 on the front side of the movable shelf 1. Then, the mechanism portion is concealed by the front panel 17, and only the operation handle 6 is exposed to the front side.

  Next, the bidirectional clutch mechanism 12 will be described. As shown in FIGS. 4 to 8, the operation handle 6 is attached to the upper portion of the support plate 30 with a bidirectional clutch mechanism 12 interposed between the shaft portion 31 and the drive gear 8, Only when the rotational force is applied to the operation handle 6 in any direction, the bidirectional clutch mechanism 12 is linked to transmit the rotational force of the operation handle 6 to the drive gear 8.

  Specifically, a cam wheel 34 having the drive gear 8 fixed thereto and a claw attachment fixed to the shaft portion 31 of the operation handle 6 on a support shaft 33 projecting from a fixed plate 32 attached to the upper portion of the support plate 30. A disk 35 is coaxially attached to each other so as to be independently rotatable, and engaging portions 37, 37 project from the inner peripheral surface of the cylindrical portion 36 of the cam wheel 34 at intervals of 180 °, and the operation handle 6 is suspended by its own weight. In this state, both ends of the pawls 38 and 38 are pivotally mounted on both sides of the upper portion of the pawl mounting disk 35, and both pawls 38 and 38 are positioned in the cylindrical portion 36 of the cam wheel 34. Structure.

  As shown in FIG. 6, one end of the claw 38, 38 is pivotally attached to both sides of the upper portion of the claw mounting disk 35 by horizontal pivots 39, 39, and the free end of each claw 38 is engaged with the engagement end. The stopper part 40 that stops against the stepped part of the part 37 is provided so as to be rotatable so that the roller 41 protrudes from both sides slightly to the base end side from the corresponding stopper part 40. The claw 38 that hangs down by its own weight on the pivot 39 has the shaft portion in which the roller 41 extends to the inner surface of the cylindrical portion 36 or the inside of the cylindrical portion 36 by the rotation of the claw mounting disk 35 accompanying the rotation of the operation handle 6. 31 is in sliding contact with the outer periphery.

  Then, by rotating the operation handle 6, one of the hanging claws 38 engages with a stepped portion of the engaging portion 37 closest to the rotation direction to drive the cam wheel 34, that is, to rotate the drive gear 8. Drive. Then, while the rotational force is applied to the operation handle 6, the engagement between the claw 38 and the engaging portion 37 is maintained and the rotational force is transmitted to the drive gear 8. Further, when the hand is released from the operation handle 6 at an arbitrary rotational position, the engagement between the claw 38 and the engaging portion 37 is released, and the operation handle 6 returns to the initial state where the operation handle 6 hangs down due to its own weight. .

  FIG. 8 shows a mechanism in which the operation handle 6 and the drive gear 8 are linked via the bidirectional clutch mechanism 12. FIG. 8A shows a state in which the clutch mechanism is released and the operation handle 6 hangs down by its own weight, and FIG. 8B shows a state in which the operation handle 6 is rotated clockwise and one claw 38 is positioned on the lower side. The state where the clutch mechanism is engaged with the joint portion 37 is shown.

It is a whole perspective view of the manual movement shelf which employ | adopted the rotational force transmission apparatus of this invention. It is a partial front view which shows the outline of the rotational force transmission apparatus of this invention. It is a longitudinal cross-sectional view similarly. It is a fragmentary longitudinal cross-section which shows the principal part of this invention. It is a longitudinal cross-sectional view similarly. FIG. 5 is a sectional view taken along line XX in FIG. 4. It is the YY sectional view taken on the line of FIG. The operation principle of the two-way clutch mechanism is shown, (a) is a partial vertical cross-sectional view in a state in which the operation handle and the drive gear are disengaged, and (b) is a partial vertical cross-section in a state in which the operation handle and the drive gear are connected. FIG.

Explanation of symbols

1 mobile shelf, 2 rails,
3 passages, 4 drive wheels,
5 driven wheel, 6 operation handle,
7 rotational force transmission device, 8 drive gear,
9 toothed idler pulley, 10 toothed driven pulley,
11 timing belt, 12 bidirectional clutch mechanism,
13 trolleys, 14 struts,
15 shelves, 16 housing parts,
17 Front panel, 18 Power shaft,
19 rotation axis, 20 external teeth,
21 internal teeth, 22 support wheels,
23 rolling wheels, 24 body,
25 flange plate, 26 meshing part,
27 peripheral protrusion, 28 protrusion,
29 screws, 30 support plates,
31 shaft part, 32 fixing plate,
33 spindles, 34 cam cars,
35 claw mounting disk, 36 cylindrical part,
37 engaging portions, 38 claws,
39 Axis, 40 Stop,
41 Laura.

Claims (4)

  A belt-driven rotation in which an internal tooth provided on the inner periphery of a ring-shaped toothed idler pulley is inscribed in the drive gear and a timing belt is wound around the toothed idler pulley and the driven toothed driven pulley. In the force transmission device, a coaxial cylindrical support ring is provided on both axial sides of the external teeth of the drive gear, and the rolling wheels are in contact with the support wheels of the drive gear on both axial sides of the internal teeth of the toothed idler pulley. The rotational force transmission device is configured so that the outer teeth of the drive gear and the inner teeth of the toothed idle pulley do not bottom out in a state where the support wheel and the rolling wheel are in contact with each other.   The diameter of the support wheel of the drive gear is set smaller than the diameter of the root circle of the external tooth, and the inner diameter of the rolling ring of the toothed idler pulley is set smaller than the diameter of the tip of the tooth of the internal tooth. The rotational force transmission device according to claim 1.   One of the rolling wheels of the toothed idler pulley is formed integrally with the inner teeth on the ring-shaped main body, and the other peripheral ring is an inner peripheral portion of a ring-shaped flange plate that is detachably screwed to the main body. The rotational force transmission device according to claim 1 or 2, wherein the rotational force transmission device is formed as described above. 4. The rotational force according to claim 3, wherein the outer peripheral portion of the flange plate protrudes radially outward from the meshing portion of the timing belt formed on the outer periphery of the main body, and the outer peripheral protruding portion serves as a stopper for the timing belt. Transmission device.

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