JP2012232054A - Coil spring type driving unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil spring type driving unit that rotates in the same direction in input and output, using a single driving shaft.SOLUTION: The coil spring type driving unit includes a unidirectional rotation mechanism where the end of a coil spring 1 is engaged with the winding core gear 12 at one end of a travelling gear train 24 and a winding gear train 23 and with a barrel gear 2 while the driving shaft gears 5, 6 at the other ends are provided in a driving shaft 4, to make a winding system gear ratio in winding larger than a travelling system gear ratio and also to make the winding gear train to rotate only in the winding direction of the coil spring, and also includes a switching mechanism that makes the two driving shaft gears 5, 10 in the winding gear train engaged with each other, and separated from each other when travelling. The two gears are meshed with each other to drive the driving shaft, causing the switching mechanism to separate the two gears from each other in travelling, also causing the unidirectional rotation mechanism to inhibit reverse rotation of the winding gear train, transmitting the rotation force exerted when the coil spring is released to the driving shaft gear through the travelling gear train.

Description

  The present invention relates to a drive unit that outputs rotation using a spring (spiral spring) as a power source. More specifically, the present invention relates to a spring-type drive unit in which a winding rotation shaft and a driving rotation shaft of a power source are single and have the same rotation direction.

  2. Description of the Related Art A pull-back hoisting spring type driving unit that has been used in the past for automobile mochi and the like is a gear that meshes only at the time of hoisting rotation by reversely rotating the driving shaft by pulling the driving shaft with a tire attached later. The mainspring is wound up by using the train, and when the mainspring is opened, the drive shaft is rotated to travel rotation by using the gear train which is engaged only during traveling rotation. That is, the rotation of the drive shaft is reversed between winding and running.

  In addition, a spring-type drive unit has been proposed in which the direction of rotation of the drive shaft during winding of the mainspring and that during travel are matched (for example, see Patent Document 1). This uses two independent gear trains for the winding rotor and drive rotor that are not single.

JP2008-144488

  However, in the conventional pull-back type spring-type drive unit, the rotation direction of the drive shaft at the time of winding rotation and traveling rotation cannot be matched. In addition, when the winding rotary body and the driving rotary body of the mainspring type drive unit are made into two independent gear trains, when the driving rotary body is rotating, the winding rotary body is reversely rotated. The body must not be subjected to external force, and the number of parts increases and the mass production cost increases.

  In addition, in the case of a toy equipped with a conventional pull-back type spring driving unit, such as a car toy, the infant cannot understand the mechanism of pulling back and winding up the spring, so there are many cases where it always plays by pushing in the traveling direction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a mainspring-type drive unit having a simple structure and using the single drive shaft to make the input and output rotation directions the same.

  In order to achieve such an object, the invention according to claim 1 is characterized in that the inner end portion of the mainspring disposed inside the barrel gear is used as the core gear at one end of the traveling gear train provided in the housing. The outer end is engaged with the barrel gear at one end of the hoisting gear train provided in the housing, and the drive shaft gears at the other end of the running gear train and the hoisting gear train are provided on the drive shaft. The winding gear train is configured to have a winding gear ratio on the winding gear train side larger than the traveling gear ratio on the traveling gear train side, and to rotate the winding gear train only in the mainspring winding direction, and the winding gear train A switching mechanism that engages two gears at the time of hoisting and disconnects them at the time of traveling, and at the time of hoisting, meshes the two gears and rotates the drive shaft to rotate the hoisting gear. And the traveling gear train while rotating the mainspring. During traveling, the two gears are separated by the switching mechanism, and the reverse rotation of the winding gear train is prevented by the one-way rotating mechanism. The rotational force at the time of opening is transmitted to the drive shaft gear through a traveling gear train.

  According to a second aspect of the present invention, in the first aspect, one of the two gears is the driving gear, and a driving shaft of the driving gear is a bearing in a vertically long slot formed in the housing. The drive shaft is at the lower end of the elongated hole and is biased so as to be separated from the other gear.

  According to the first aspect of the present invention, when the mainspring is wound, by rotating the drive shaft, the winding gear train and the traveling gear train rotate, but the winding gear ratio is larger than the traveling gear ratio. The mainspring is wound up according to the rotation of the drive shaft. Since the two gears constituting the winding gear train are separated by the switching mechanism during traveling after winding, only the gear of the traveling gear train is rotated on the drive shaft, and the reverse rotation of the winding gear train is performed by the one-way rotating mechanism. Since it is blocked, the mainspring is released in the same direction as when it is wound, and is transmitted to the drive shaft gear via the traveling gear train, so that the drive shaft rotates in the same direction as when it is wound.

  Thus, the mainspring can be wound and traveled by a single drive shaft by switching the meshing between the drive shaft and the winding gear train. In addition, since the barrel gear in which the mainspring is stored by the one-way rotation mechanism rotates in the same rotation direction during winding and traveling, the rotation direction of the drive shaft can be set to the same rotation direction during winding and traveling. Is possible. Furthermore, the number of parts can be reduced, the manufacturing cost can be reduced, and the unit can be miniaturized.

  In addition, when the drive unit is mounted on a toy, for example, a toy for a car, since it travels in the traveling direction when pushed and released in the traveling direction, even an infant can easily play.

  According to the second aspect of the present invention, the drive shaft moves to the upper end of the elongated hole and meshes with the other gear by pressing the housing downward during winding, so that the winding gear train operates and the housing is moved during traveling. By loosening the downward pressing force, the drive shaft moves to the lower end of the elongated hole and is separated from the other gear so that the winding gear train does not operate. Therefore, since only the traveling gear train operates during traveling, traveling is performed smoothly.

It is a front view which shows the internal structure of one Embodiment of the mainspring type drive unit of this invention. It is a perspective view which shows the internal structure of the drive unit. A bottom view simply showing the winding gear train and the running gear train It is a top view which mainly shows the gear train of the gear mechanism of a drive unit. It is a front view which mainly shows the gear train of the gear mechanism of the drive unit at the time of driving | running | working. FIG. 5A is a front view and FIG. 5B is a perspective view showing a template frame of the drive unit. It is a figure which shows the partition frame of a drive unit, (A) is a front view, (B) is a perspective view. It is a figure which shows the female frame of a drive unit, (A) is a front view, (B) is a perspective view. (A) which shows one Embodiment of the one-way rotation mechanism of the drive unit is a front view, (B) is sectional drawing.

Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.
1 to 9 show an embodiment of the mainspring drive unit of the present invention. The mainspring drive unit is rotatably supported so as to be movable along a housing 9 including a male frame 9a, a female frame 9c, and a partition wall frame 9b, and a long hole 17 of the male frame 9a and the female frame 9c. Drive shaft 4, drive shaft gears 5, 6 provided on the drive shaft 4, a power source spring 1, and a core gear 12 supported by a housing 9 for winding the spring 1. A winding gear train 23 including a barrel gear 2 housing the spring 1 arranged coaxially with the winding core gear 12 and a winding gear 10 that meshes with the drive shaft gear 5 when the mainspring 1 is wound (FIG. 3). And a traveling gear train 24 (see FIG. 3) including a traveling gear 7 for transmitting the traveling rotation of the barrel gear 2 containing the mainspring 1 to the drive shaft gear 6, and a ratchet fixed to the female frame 9c. 11 a A unidirectional rotating mechanism 14 that rotates in the winding direction of the mainspring 1 and does not rotate in the opening direction of the mainspring 1 by the serrated inner teeth 12a of the core gear 12 combined with the outside of the claw 11b at the tip of the spring 11a; A gear mechanism 3 that changes a gear ratio by switching part of the constituent gears during traveling and winding, and a drive shaft gear 5 that can move along the elongated holes 17 of the male frame 9a and the female frame 9c; 6 is engaged with the traveling gear 7, but is in contact with the resin spring 18 integral with the partition frame 9b and is held so as not to engage with the winding gear 10, and when the drive shaft 4 moves to the elongated hole 17a. It mainly comprises a switching mechanism 13 that meshes with the hoisting gear 10. At the time of winding, the rotation input from the driving shaft 4 is transmitted to the mainspring 1 through the winding gear train 23 of the gear mechanism 3 by meshing the driving shaft gear 5 of the switching mechanism 13 with the winding gear 10. The rotation of the barrel gear 2 which is rotated by the force of the mainspring 1 by the one-way rotation mechanism 14 is transmitted to the drive shaft 4 via the traveling gear train 24 of the gear mechanism 3, and the rotation direction when the drive shaft 4 is wound and when traveling. Are the same.

  The gear mechanism 3 includes a barrel gear 2 to which the mainspring 1 is mounted, a drive gear 6 fixed to the drive shaft 4, a travel gear 7 meshing with the drive gear 6, and the travel gear 7 coaxially. The driving gear 8 that is formed on the barrel 1 and meshes with the barrel gear 2, the driving gear 5 that is formed coaxially with the driving gear 6, and the core gear 12 that engages and fixes the end of the mainspring 1. The winding core gear 12 is composed of a winding gear 10 that meshes only when winding. As shown in FIGS. 3 and 4, the gear mechanism 3 rotates in the order of the driving shaft 4 → the driving gear 5 → the winding gear 10 → the core gear 12 → the mainspring 1 when winding the mainspring 1. A winding gear train 23 is formed. When the mainspring 1 is opened, as shown in FIGS. 4 and 5, the mainspring 1 → the barrel gear 2 → the driving gear 8 → the driving gear 7 → the driving gear 6 → the drive shaft 4 is rotated. The traveling gear train 24 is transmitted. The hoisting gear ratio is made larger than the traveling gear ratio.

  The traveling gears 7 and 8 and the hoisting gear 10 are integrally formed with the shaft, for example, by plastic such as polyacetal. The hoisting gear 10 is a hanging gear that meshes with or disengages from the core gear 12 depending on the rotation direction of the drive gear 5, and the shaft of the hoisting gear 10 is formed on the female frame 9c and the partition frame 9b. It is accommodated in the arc-shaped elongated hole 16. Each elongated hole 16 is formed in an arc shape that forms a part of a concentric circle when the driving gear 5 is forcibly engaged with the hoisting gear 10.

  In this embodiment, the drive shaft 4 is composed of a plastic molded product 4a and a metal shaft 4b that supports the plastic molded product 4a, and is integrated by press-fitting. The plastic molded product 4a forms driving gears 5 and 6 by integral molding.

  The switching mechanism 13 switches between the traveling gear train 24 and the winding gear train 23, and the drive shaft 4 is supported by a long hole 17 formed in the male frame 9a and the female frame 9c. Each elongated hole 17 is configured so that the traveling gear 7 and the driving gear 6 are always engaged with each other at any position of the oblique elongated hole 17 that is vertically long. The winding gear 10 and the driving gear 5 are: When the drive shaft 4 is at the upper end 17a of the elongated hole 17 (the state of FIG. 1), it is engaged, and when it is at the lower end 17b (the state of FIG. 5), it is disconnected.

  Further, a spring means 18 is provided for biasing the drive shaft 4 so as to hold the drive shaft 4 at the position of the lower end 17b of each elongated hole 17 of the male frame 9a and the female frame 9c. The spring means 18 is formed on the partition frame 9b and urges the drive shaft 4 to return to the position of the lower end 17b when the drive shaft 4 moves to the position of the upper end 17a of the elongated hole 17 of the male frame 9a and female frame 9c. ing. In this embodiment, the spring means 18 is made of a plastic resin spring that is molded from plastic, and is provided so as to bend in the direction of the upper end 17a of the elongated hole 17.

  The one-way rotating mechanism 14 allows the core gear 12 to rotate only in one direction. The ratchet 11 includes an S-shaped arm 11a and a core gear fixed to the female frame 9c by press-fitting. 12 and a serrated inner tooth 12a with which the tip 11b engages when the arm 11 rotates in the opening direction of the mainspring 1. Therefore, the winding core gear 12 rotates in the winding direction of the mainspring, but does not rotate in the opening direction of the mainspring. In this embodiment, the ratchet 11 is made of plastic and formed by integral molding.

  The core gear 12 is integrally formed with the shaft by plastics such as polyacetal. Further, a bifurcated mainspring mounting portion 19 for attaching an inner end portion of the mainspring, a winding core gear 12, and a serrated inner tooth 12a are formed.

  The barrel gear 2 is provided with a peripheral wall 20 surrounding the mainspring 1 from the radial direction over the entire circumference. At least one recess 20a is formed on the peripheral wall. The outer end of the mainspring 1 is folded back and pushed into the recess 20a of the barrel gear 12 to be engaged therewith. On the other hand, the inner end of the mainspring 1 is fitted between two protrusions 19 formed integrally with the core gear 12 and fixed in an engaged state. Therefore, if the mainspring 1 is excessively wound, the outer end portion of the mainspring 1 jumps out of the recess 20a and moves along the inner wall surface so that it cannot be wound any further.

  The gear box is configured to be separable into a male frame 9a, a female frame 9c, and a partition wall frame 9b sandwiched therebetween, and an engagement pin 22a formed on the male frame 9a is attached to the female frame 9c. The frames 9a to 9c are integrated by press-fitting into the formed hole 22b.

  According to the mainspring-type drive unit configured as described above, the same rotation direction can be achieved during winding and traveling with a single drive shaft as follows.

  A case where the drive unit is mounted on a toy, for example, a car toy will be described as an example. First, when the toy is pressed against the floor surface, as shown in FIG. 4, the drive shaft 4 moves to the position of the upper end 17a of each frame slot 17 of the frames 9a, 9c. When the driving gear 10 meshes and the toy is pushed in the traveling direction (the direction indicated by the arrow (←) in FIG. 1) to rotate the drive shaft 4 forward (counterclockwise in the drawing), the driving gear 5 rotates to rotate the winding gear. 10 bites into the core gear 12 on which the mainspring 1 is mounted, and the mainspring 1 is wound up by the rotation transmitted from the drive shaft 4. At this time, the driving shaft gear 6 and the traveling gears 7 and 8 that are always meshed with each other also rotate, and the barrel gear 2 also rotates in the positive direction, but the winding system gear ratio is larger than the traveling system gear ratio. The mainspring 1 can be wound up. At this time, when the drive shaft 4 is rotated in the direction opposite to the traveling direction, the winding gear 10 engaged with the drive gear 5 by the clockwise rotation of the drive gear 5 passes through the elongated hole 16 in the drive gear 5. It is pushed up in the rotational direction (position 16a) to disengage from the core gear 12 and idle, thereby protecting the core gear 12 from being broken. When the mainspring 1 is wound up by a predetermined amount, the outer end of the mainspring 1 that is not restrained moves out of the recess 20a of the barrel gear 2 and moves. This can be known from the sound that the end of the mainspring 1 enters and exits the recess 20a. Therefore, the winding operation is stopped.

  Next, when the car toy is released, as shown in FIG. 9, the winding core gear 12 cannot be rotated clockwise by the one-way rotating mechanism 14, so that the rotation is switched to the traveling gear train 24 by the switching mechanism 13, and the mainspring 1 The barrel gear 2 rotates in the counterclockwise direction by opening. For this reason, the rotation of the barrel gear 2 is transmitted to the barrel gear 2 → the traveling gear 8 → the traveling gear 7 → the driving gear 6 to drive the toy car. At this time, the driving shaft gear 6 meshed with the traveling gear 7 is pressed in the direction of the lower end 17b of the long hole 17 of each frame by the rotational force of the traveling gear 7, so that the winding gear 10 and the driving gear 5 Since only the traveling gear train 24 is activated, traveling is performed smoothly. When the mainspring is released, the drive shaft 4 is pushed in the direction of the lower end 17b of each frame elongated hole 17 by the spring means 18 of the partition frame 9b constituting the switching mechanism 13, and the drive gear 5 is separated from the winding gear 10 ( The state of FIG. Therefore, the mainspring 1 cannot be wound up even if the drive shaft 4 rotates in the traveling direction.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, the switching mechanism 13 is not limited to the one using the above-described resin spring. For example, although not shown, a switching mechanism using a torsion spring or a coil spring can be used.

  Further, in the above description, the one-way rotating mechanism 14 is formed with the ratchet 11 and the sawtooth internal teeth 12a. For example, although not shown, the frame 9c and the core gear 12 are sawtooth in the thrust direction. A one-way rotation mechanism formed of can also be used.

In the above-described embodiment, both the holes 17 of the plates 9a and 9b are elongated holes, but the elongated holes 17 of the plate 9a on the traveling gear train 24 side may be circular holes.
Although the switching mechanism is constituted by spring means, the driving gear may be moved manually, the driving gear and the hoisting gear may be engaged when the mainspring is hoisted, and the driving gear may be disconnected when the mainspring is running. Good.
Furthermore, the one-way rotation mechanism may have other configurations.

  The spring-type drive unit of the present invention pushes the mainspring as a driving source of an automobile toy, winds the mainspring, outputs the rotation that travels in the same direction when the mainspring is released, or winds the mainspring by pushing in the moving direction. It can be used as a drive source for obtaining movement that moves in the same direction when opened.

DESCRIPTION OF SYMBOLS 1 Spring 2 Gear for barrel 3 Gear mechanism 4 Drive shaft 5, 6 Drive shaft gear 8, 7 Traveling gear 9 Housing 9a Male frame 9b Bulkhead frame 9c Female frame 10 Winding gear 12 Winding gear gear 13 Switching mechanism 14 unidirectional rotating mechanism 17 long hole 23 hoisting gear train 24 traveling gear train

Claims (2)

The inner end of the mainspring arranged inside the barrel gear is used as a winding gear for one end of a traveling gear train provided in the housing, and the outer end of the mainspring is used as one end of a hoisting gear train provided in the housing. Engage with each barrel gear, each drive shaft gear of the other end of the running gear train and the winding gear train is provided on the drive shaft,
The winding gear ratio on the winding gear train side during winding is larger than the traveling gear ratio on the traveling gear train side,
A unidirectional rotation mechanism that rotates the winding gear train only in the mainspring winding direction, and a switching mechanism that engages the two gears that constitute the winding gear train at the time of winding and disconnects at the time of traveling,
At the time of winding, the two gears are meshed and the drive shaft is rotated to wind the mainspring while rotating the winding gear train and the traveling gear train. At the time of traveling, the two gears are separated by the switching mechanism. In addition, by preventing reverse rotation of the winding gear train by the one-way rotating mechanism, the rotational force when the spring is opened is transmitted to the drive shaft gear through the traveling gear train. Drive unit.   One of the two gears is the drive gear, and the drive shaft of the drive gear is supported by a vertically long slot formed in the housing, and the drive shaft is positioned at the lower end of the slot. The mainspring drive unit according to claim 1, wherein the mainspring drive unit is biased so as to be separated from the other gear.

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