JP6033638B2 - DESIGN DEVICE, DESIGN METHOD, PROGRAM, AND POWER TRANSMISSION DEVICE - Google Patents

Description

  The present invention relates to a design device, a design method, a program, and a power transmission device, and in particular, a power transmission device that moves a bent pin rack formed by connecting a plurality of small rack bars in a chain shape so as to be rotatable in at least two directions. The present invention relates to a design apparatus for designing.

  One of the methods for opening and closing the sluice door is a rack type. This is to open and close a door body of a sluice by moving a rack bar having a door body connected to one end by rotating a drive gear meshing with the rack bar.

  Traditionally, linear rack bars have been used. However, when a linear rack bar is used, the rack cover protrudes linearly. In this case, it becomes easy to receive a lightning strike, and it takes time and effort for construction. For this reason, there are some which are raised while being bent using a bent pin rack in which small rack bars are connected in a chain shape.

  As a sluice using a bending pin rack connected in a chain shape, for example, as described in Patent Document 1, a sliding slide is used to correct or guide the bending of the bending pin rack. It has been.

  Japanese Patent Application Laid-Open No. H10-228707 describes that the door body is pulled up without bending the bending pin rack by correcting the one-direction bending bending pin rack with a support roller and two guide rollers.

Utility Model Registration No. 2540540 JP 2011-179231 A

  However, when a sliding slide such as that disclosed in Patent Document 1 is used, as described in Patent Document 2, strength and accuracy are required, which is relatively expensive, and the sliding slide is long. As a result, this has become a constraint for equipment design.

  Further, when a unidirectional bent pin rack as in Patent Document 2 is used, the bending direction is limited. Further, since the connecting block for connecting the small rack bars receives a large force to suppress the bending, the width becomes larger than the rack width. Such a restriction condition limits the range that can be handled.

  Therefore, the present invention has an object to propose a design device or the like that can design a support roller that efficiently suppresses the force that the drive gear exerts on the bending pin rack even if the bending pin rack can be bent in at least two directions. To do.

  A first aspect of the present invention is a design device for designing a power transmission device that transmits power to a bent pin rack formed by connecting a plurality of small rack bars so that they can be bent in at least two directions. The apparatus includes a drive gear that meshes with the small rack bar and moves the bending pin rack, and a support roller that supports the small rack bar meshed with the drive gear from the opposite side of the drive gear. A pressure angle analyzing means for analyzing a position where a pressure angle of a force applied to the small rack bar meshed with the drive gear is maximized; a position of the support roller; and the drive gear with respect to the small rack bar. Support roller position determining means for determining a position to receive the force of the maximum pressure angle to be applied.

  A second aspect of the present invention is the design apparatus according to the first aspect, wherein the pressure angle analyzing means is configured such that the contact position between the pin of the small rack bar and the drive gear at the time when the pressure angle becomes maximum. The support roller position determining means determines the position of the support roller at a position where the component force acting in the direction of moving the entire bending pin rack away from the drive gear is pressed at the generation position.

  A third aspect of the present invention is the design apparatus according to the first or second aspect, wherein the bent pin rack has one end connected to a load body, and the power transmission device includes the drive A support roller that supports the bent pin rack from the opposite side of the gear; and a plurality of guide rollers that support the bent pin rack from the same side as the drive gear; and the position of the support roller is higher than that of the support roller. The support roller position determining means for determining the side where the load body does not exist, and at least one position of the guide roller is determined on the side where the load body exists relative to the drive gear, and at least one other of the guide roller Guide roller position determining means for determining one position on the side where the load body does not exist with respect to the drive gear is provided.

  A fourth aspect of the present invention is a design method for designing a power transmission device that transmits power to a bending pin rack formed by connecting a plurality of small rack bars so that they can be bent in at least two directions. The apparatus includes a drive gear that meshes with the small rack bar and moves the bending pin rack, and a support roller that supports the small rack bar meshed with the drive gear from the opposite side of the drive gear. A pressure angle analyzing step for analyzing a position at which a pressure angle of a force applied to the small rack bar meshed with the drive gear is maximized; and a support roller position determining means for detecting the position of the support roller. A support roller position determining step is included, wherein the position is determined as a position where the driving gear receives a force of a maximum pressure angle applied to the small rack bar.

  According to a fifth aspect of the present invention, there is provided a computer, the bending pin rack for designing a power transmission device for transmitting power to a bending pin rack formed by connecting a plurality of small rack bars so as to be bent in at least two directions. Pressure angle analyzing means for analyzing the position where the pressure angle of the force applied to the small rack bar with which the drive gear meshes to transmit power to the maximum, and the position of the support roller. This is a program for functioning as support roller position determining means for determining the position of receiving the force of the maximum pressure angle applied to the small rack bar from the side opposite to the drive gear.

  A sixth aspect of the present invention is a power transmission device that transmits power to a bent pin rack formed by connecting a plurality of small rack bars so that they can be bent in at least two directions, and includes one of the small rack bars. The drive gear that receives the force of the maximum pressure angle that the drive gear applies to the small rack bar with respect to the drive gear that meshes and moves the bent pin rack and the small rack bar that meshes with the drive gear. A support roller is provided to support from the side opposite to the gear.

  A seventh aspect of the present invention is the power transmission device according to the sixth aspect, wherein the bent pin rack has one end connected to a load body, and at least one of the rack pins of the bent pin rack is The diameter of the drive gear is larger than that of the other rack pins, and the drive gear meshes with a rack pin between the load body and the rack pin with a large diameter. It does not mesh beyond a rack pin with a large diameter.

  Conventionally, a rack bar that does not bend is assumed. Even in the bent pin rack, from the opposite side of the drive gear, by setting two rollers near the entrance and exit where the drive gear meshes with the rack, it tries to keep pressing from the beginning to the end of the meshing section. There was no exact pressure angle calculation.

  By examining the relationship between the rotation angle of the drive gear and the pressure angle applied by the drive gear to the small rack bar, the inventors change the pressure angle significantly as will be described in detail with reference to FIG. The rotation angle of the drive gear and the contact position between the pin and the drive gear at the rotation angle were precisely derived. As shown in FIG. 2, this significant change in the pressure angle is related to the point in time when the amount of increase in the displacement of the small rack bar changes with the rotation of the drive gear. In the vicinity of the time when the pressure angle changes significantly, the driving gear has a large component force to lift the small rack bar from below.

  Therefore, as in each aspect of the present invention, the support roller supports the small rack bar with which the drive gear meshes with respect to the maximum pressure angle from the side opposite to the drive gear, thereby bending the bent pin rack. It can be efficiently controlled, avoid excessive quality, reduce costs, save space and save resources. This support roller presses the small rack bar with which the drive gear meshes. Therefore, even a bent pin rack that bends in two directions can be supported. Furthermore, since the support roller linearly supports the position of the pin with which the drive gear meshes, in principle, it is not necessary to reinforce the portion connecting the small rack bars.

  Further, in the portion where the pressure angle is large, it can be understood that the rotational torque of the drive gear is dispersed in addition to the force for lifting the rack. The stress can be grasped as a resistance force generated inside when an external force from the drive gear is applied to the bending pin rack. As in the second aspect of the present invention, when the supporting body accurately pulls the component force acting in the direction away from the drive gear from the drive gear, the support roller accurately presses the load body such as the door body. The deviation between the direction of the pulling-up force and the central axis of the bent pin rack becomes a smaller value than other methods, and can be within the design tolerance. Therefore, each part will follow the design life.

  Further, as in the third aspect of the present invention, the support roller other than the support roller is supported from the side opposite to the drive gear and the guide roller is pressed from the same side as the drive gear in the same manner as the support roller. In combination with other rollers, the roller can hold the bending pin rack more efficiently.

  Furthermore, according to the seventh aspect of the present invention, by increasing the diameter of a predetermined rack pin (located on the rack pin with which the drive gear meshes when the sluice door is closed), the accessory ( For example, the rotation of the drive gear can be reliably inhibited without the need for a projection, a mechanism, a position determination device, and the like, and the bent pin rack can be prevented from being detached from the drive gear as a stopper.

It is a figure which shows the outline | summary of an example of the power transmission device which concerns on embodiment of this invention. 4 is a graph showing the relationship between the rotation angle of the drive gear 3 and the positional change of the bent pin rack 5. It is a graph which shows the relationship between the rotation angle of the drive gearwheel 3, and the pressure angle applied to one pin of a small rack rod. It is the figure which analyzed the rotation angle of the drive gear 3 corresponding to the vicinity of the maximum pressure angle. It is a figure which shows the positional relationship in case the drive gearwheel 3 meshes with pins 9 ₁ , 9 ₂ , 9 ₃ , 9 ₄ and 9 ₅ . It is a figure which shows an example of a positional relationship when the tooth | gear 37 of a drive gear stops because a meshing is inhibited by the stopper pin 33. FIG. It is a schematic block diagram which shows an example of the design apparatus for designing the power transmission device 1 of FIG. It is a flowchart which shows an example of operation | movement of the design apparatus 31 of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment of the present invention is not limited to this example.

  FIG. 1 is a diagram showing an outline of an example of a power transmission device according to an embodiment of the present invention. The power transmission device 1 includes a drive gear 3 (an example of a “drive gear” in the claims). The power transmission device 1 rotates the drive gear 3 to raise and lower a bent pin rack 5 (an example of a “bend pin rack” in the claims) that meshes with the drive gear 3. The bent pin rack 5 has, for example, a straight pin rack longer than the small rack bar of the bent pin rack 5 or a sluice door body at the end located on the lower side of the power transmission device 1 in FIG. An example of a “body” is provided. The power transmission device 1 opens and closes the door body of the sluice by raising and lowering the bending pin rack 5.

  The bending pin rack 5 can be bent on both the right and left sides in FIG. Therefore, in the power transmission device of FIG. 1, the bending pin rack 5 can be bent not only on the right side as shown in FIG. 1 but also on the left side, for example.

  In the case of Patent Document 2, a bent pin rack that is bent in one direction is used. For this reason, it was possible to prevent bending without special consideration by supporting in a wide range including the adjacent small rack bar from the opposite side of the drive gear, as in the case of the conventional rack bar not bent. However, the bending pin rack 5 of FIG. 1 bends on both sides. Therefore, even if it supports in the wide range from the opposite side to the drive gear 3, the bending accompanying rotation of the drive gear 3 cannot be prevented.

  Therefore, the inventors examined the relationship between the rotation angle of the drive gear 3 and the displacement of the small rack bar with which the drive gear 3 meshes. FIG. 2 is a graph showing the relationship between the rotation angle of the drive gear 3 and a change in the bending pin rack 5. The horizontal axis indicates the rotation angle (deg) of the drive gear 3. The broken line indicates the rack position. One scale on the right vertical axis is 20 (mm). The solid line indicates the rack rise change amount. One scale on the left vertical axis is 0.1 (mm).

  According to the broken line graph of FIG. 2, the bending pin rack 5 changes substantially constant as the drive gear 3 rotates. However, as shown in the solid line graph of FIG. 2, strictly speaking, the bending pin rack 5 does not displace constantly as the drive gear 3 rotates, but the amount of displacement varies according to the rotation angle. . That is, although the amount of displacement decreases smoothly in many parts, it decreases from increasing to decreasing near 28 ° and decreases toward 32 °.

  Subsequently, the inventors examined the relationship between the rotation angle of the drive gear 3 and the angle of pressure applied to the pin of the small rack bar by the drive gear 3 (referred to as “pressure angle”). FIG. 3 is a graph showing the relationship between the rotation angle of the drive gear 3 and the angle of the pressure applied to the pin of the small rack bar. The horizontal axis indicates the rotation angle, and the vertical axis indicates the pressure angle. One scale on the vertical axis is 5.0 (degrees). The pressure angle changes within a certain range, and there is a maximum value and a minimum value. Near 30 °, it changes abruptly between an approximate maximum pressure angle and an approximate minimum pressure angle. Since then, it has changed almost monotonously and smoothly. Referring to FIGS. 2 and 3, it can be seen that the angle that is the maximum pressure angle is related to the point in time when the amount of change in the bending pin rack 5 changes as the drive gear rotates.

  FIG. 4 is an analysis of the pressure angle when the rotation angle of the drive gear 3 is around 30 °. (A)-(e) is analyzing the contact position of the pin of the small rack bar | burr and the drive gear 3 in each rotation angle, changing the rotation angle of the drive gear 3 minutely. In the case of the drive gear 3, it has been found that the pressure angle becomes maximum in (e). As described above, by changing the rotation angle of the drive gear 3 and analyzing the change in the pressure angle, it is possible to strictly analyze the case where the pressure angle is maximized.

FIG. 5 is a diagram showing a positional relationship among the drive gear 3, the bending pin rack 5, and the rollers in the present invention. The bending pin rack 5 has a plurality of small rack bars 7 ₁ and 7 ₂ connected to both sides so as to be bent. The small rack bar 7 ₂ includes five rack pins 9 ₁ , 9 ₂ , 9 ₃ , 9 ₄ and 9 ₅ . Each rack pin has a structure that can rotate around the long axis and has no local wear on the pin circumference. The rack pin 9 ₁ is located at the connecting portion of the small rack bars 7 ₁ and 7 ₂ . 9 ₅ are those located coupling portion between the small rack bar which is located on the side of the door body or the like. In general, there are four types of pins in the pin rack. That is, there is a type with the same diameter and a groove for retaining the retaining ring on both ends, a small diameter part on both sides, a type with four retaining groove on both ends, and a guide roller attached, and a small diameter part on both sides A type without a groove, a type with a small diameter part on both sides, and two types of retaining grooves on both ends. Use as appropriate as necessary.

  The power transmission device 1 includes a support roller 11 (an example of a “support roller” in the claims), a support roller 13 (an example of a “support roller” in the claims), and guide rollers 15, 17, 19, and 21 ( An example of a “guide roller” in the claims of the present application.

  The support roller 11 and the support roller 13 support the bending pin rack 5 from the side opposite to the drive gear 3. The driving gear 3 meshes from one side and applies a force to raise the bending pin rack 5. The support roller 11 and the support roller 13 hold the rack from the side opposite to the drive gear 3 and support it as stress in the rack.

  By design, the mass of the entire bent pin rack 5 is supported by the drive gear with a single pin. The shapes of the drive gear 3 and the pins of the bent pin rack 5 are various. Therefore, the contact position, the pressure angle, etc. are analyzed by specific analysis. As shown in FIGS. 2 to 4, by analyzing the contact position of the pin of the small rack bar and the drive gear 3 according to the rotation angle of the drive gear 3, the rotation angle of the drive gear 3 that maximizes the pressure angle, The contact position between the pin of the small rack bar and the drive gear 3 at the rotation angle can be analyzed. The inventors have clarified that such a singular point exists by a specific analysis. The support roller 11 is at a position where the component force acting in the direction of moving the entire bent pin rack away from the drive gear 3 is pressed at the generation position. The drive gear 3 lifts the bending pin rack 5. For this reason, the pressure angle of the force applied by the drive gear 3 to the bending pin rack 5 is maximized at a point located below the center of the drive gear 3 (on the load body side). Therefore, the supporting roller 11 can suppress the component force by directly pressing the component force when the pressure angle is maximum for the small rack bar with which the drive gear 3 is engaged with one roller. Therefore, even a bent pin rack that is bent in two directions can be supported.

  The support roller 13 supports the bending pin rack 5 from the side opposite to the drive gear 3. The guide rollers 15, 17, 19, and 21 support the bending pin rack 5 from the drive gear 3 side. By combining the support roller 11, the support roller 13 and the guide rollers 15, 17, 19, and 21, the deviation between the direction of the force that pulls up the bending pin rack and the central axis of the bending pin rack 5 should be more within tolerance. Can do. Therefore, each part will follow the design life.

5 (a), (b), (c), (d) and (e) respectively show the case where the drive gear 3 meshes with the rack pins 9 ₁ , 9 ₂ , 9 ₃ , 9 ₄ and 9 _5. It is a figure which shows a positional relationship. The support roller 11 is located on the door body side or the like with respect to the drive gear 3. Therefore, the supporting rollers 11, the drive gear 3, when meshing with Rakkupin 9 ₁ located connecting portion of the small rack bar 7 ₂ supports a small rack bar 7 ₂ (see Figure 5 (a)). Support rollers 11, the drive gear 3, Rakkupin 9 ₂ positioned other than connecting portion of the small rack bar 7 ₂ (see FIG. 5 (b)), when meshed with 9 ₃ and 9 _4, a small rack bar 7 ₂ It supports (refer FIG.5 (b) (c) (d)). Support rollers 11, the drive gear 3, when meshing with Rakkupin 9 ₅ located connecting portion of the small rack bar 7 _2, connected to a small rack bar 7 _2, supports the small rack bar located on the door side ( (Refer FIG.5 (e)).

  FIG. 6 is a diagram illustrating an example of a stopper during manual dropping. (A)-(d) shows a mode that a drive gear rotates by manual fall, and (e) and (f) show a state where rotation of a drive gear was blocked by stopper pin 23. (E) shows the positional relationship between the drive gear and the bending pin rack 22, and (f) also shows rollers and the like in addition to (e).

  The bent pin rack 22 is provided with a sluice door or the like (an example of a “load body” in the claims of the present application) below. Therefore, the sluice can be closed by manually dropping the door body or the like. The rack pin 24 in FIG. 6 is a rack pin of a bent pin rack that is meshed with the drive gear by design when the door body or the like falls and the sluice is closed.

  The stopper pin 23 is located on the pin 24 by design. The stopper pin 23 has a larger diameter than other pins. The stopper pin 23 may be, for example, a pin with a large diameter incorporated in the assembly stage, or may be a pseudo-large diameter with a cylindrical cover attached.

  As shown in FIGS. 6A to 6D, the drive gear rotates clockwise with manual dropping. As shown in FIG. 6E, the teeth 25 of the drive gear are blocked from being engaged by the stopper pin 23 and cannot be rotated. That is, since the tooth 25 of the drive gear hits the stopper pin 23 having a large diameter, the force vector direction is not in the downward direction, but is increased in the horizontal direction and cannot move downward. As shown in FIG. 6 (f), the horizontal force can be supported by a roller or the like provided on the side opposite to the drive gear. Therefore, by providing the stopper pin 23, it is possible to prevent the bent pin rack 22 from being detached from the drive gear even if it is manually dropped. This eliminates the need for accessories (for example, protrusions, mechanisms, position determination devices, etc.), and can reliably prevent rotation.

  In addition, the support roller 11 may be one as shown in FIG. 5, or a plurality of support rollers 11 may suppress the generation position of the maximum pressure angle.

  FIG. 7 is a schematic block diagram showing an example of a design device for designing the power transmission device 1 of FIG. FIG. 8 is a flowchart showing an example of the operation of the design apparatus 31 of FIG. An example of the configuration and operation of the design apparatus 31 will be described with reference to FIGS.

  An example of the configuration of the design apparatus 31 will be described with reference to FIG. The design device 31 includes an initial value setting unit 33, a roller position determination unit 35, a display unit 37, and a parameter storage unit 39. The roller position determination unit 35 includes a support roller position determination unit 41 (an example of “support roller position determination unit” in the claims of the present application), a support roller position determination unit 43, and a guide roller position determination unit 45. The support roller determination unit 41 includes a pressure angle analysis unit 47 (an example of “pressure angle analysis unit” in the claims) and a position determination unit 49 (an example of “position determination unit” in the claims).

  With reference to FIG. 8, an example of operation | movement of the design apparatus 31 of FIG. 7 is demonstrated.

  The initial value setting unit 33 causes the parameter storage unit 39 to store information such as the shape and position of the drive gear 3, the shape (length, width, etc.) of the bent pin rack 5, and the interval between rack pins (step ST1).

  The pressure angle analysis unit 47 analyzes the force applied by the drive gear 3 to one pin of the small rack bar at a position where the drive gear 3 contacts one pin of the small rack bar according to the rotation angle of the drive gear 3. To do. Then, the rotation angle of the drive gear 3 at the time when the pressure angle of the drive gear 3 becomes maximum, and the contact position between the pin of the small rack bar and the drive gear 3 at the rotation angle are analyzed (step ST2).

  The position determination unit 45 determines the position of the support roller 11 as a position where the component force acting in the direction of moving the entire bending pin rack 5 away from the drive gear 3 is pressed at the generation position (step ST3). As a result, the support roller 11 can suppress the point at which the pressure angle of the force applied to the pin of the small rack bar by the drive gear 3 becomes the maximum at the position where it is generated. The position determination unit 45 stores the position in the parameter storage unit 39.

  In order to prevent the bending pin rack 5 from bending, the position of the support roller 11 is important. The inventors examined the pressure angle of the drive gear 3 and the bending pin rack 5 in detail, and found the point where the pressure angle becomes the maximum, thereby establishing a method for determining the position of the support roller 11.

  Furthermore, for example, from the length of the unbent portion (small rack bar) of the bending pin rack 5 and the positions of the support roller 11 and the support roller 13, the position of the support roller 13, the guide rollers 15, 17, 19 for correcting the bending, Determine the position of 21. That is, the support roller position determination unit 43 determines the position of the support roller 13 to be a position above the support roller 11. The guide roller position determination unit 45 determines the guide rollers 15, 17, 19, and 21 to positions on the upper side and the lower side of the drive gear 3. For example, 17 and 19 may be omitted and only 15 and 21 may be used as the guide roller.

  The display unit 37 displays the determined position on the display unit 37 and notifies the user of the design apparatus 31 (step ST5).

  According to the present invention, the design value of the maximum stress can be clarified by confirming the pressure angle in detail. As a result, an appropriate design with a safety factor secured is possible. As a result, excessive quality for required specifications can be saved, leading to cost reduction, space saving, and resource saving. Furthermore, the life of each component is extended by using a rotating roller instead of a sliding guide.

DESCRIPTION OF SYMBOLS 1 Power transmission device, 3 Drive gear, 5 Bending pin rack, 7 Small rack bar, 9 Rack pin, 11 Support roller, 13 Support roller, 15, 17, 19, 21 Guide roller, 22 Bending pin rack, 23 Stopper pin, 24 Rack pin, 25 teeth, 31 design device, 33 initial value setting unit, 35 support roller position determination unit, 37 display unit, 39 parameter storage unit, 41 change analysis unit, 43 partial analysis unit, 45 position determination unit

Claims (7)

A plurality of designing apparatus for designing a power transmission device for transmitting power to the bending pin rack the small rack bar formed by linked to bending songs,
The power transmission device is
A drive gear meshing with the small rack bar to move the bent pin rack;
One support roller that supports the small rack bar with which the drive gear meshes from the opposite side of the drive gear ;
Comprising one support roller for supporting the bent pin rack from the opposite side of the drive gear ;
The bending pin rack has one end connected to a load body, and can be bent at least in two directions, that is, a side where the driving gear is located and a side opposite to the driving gear,
Pressure angle analysis means for analyzing a position where the pressure angle of the force applied to the small rack bar meshed with the drive gear is maximized;
Support roller position determining means for determining the position of the support roller at a position where the driving gear receives a force of a maximum pressure angle applied to the small rack bar ;
A design apparatus comprising support roller position determining means for determining a position of the support roller on a side where the load body does not exist with respect to the support roller . The pressure angle analysis means analyzes a contact position between the pin of the small rack bar and the drive gear at the time when the pressure angle becomes maximum,
The said support roller position determination means determines the position of the said support roller to the position which presses down the component force which works in the direction which keeps the said bending pin rack away from the said drive gear in the generation | occurrence | production position. Design equipment. The power transmission device is
A plurality of guide rollers for supporting the bent pin rack from the same side as the drive gear;
At least one position of the guide roller is determined on the side where the load body is present with respect to the drive gear, and at least one position of the guide roller is determined on a side where the load body is not present with respect to the drive gear. The design apparatus according to claim 1, further comprising guide roller position determining means for determining the position of the guide roller. A method for designing a power transmission device for transmitting power to the plurality of bent pin rack the small rack bar formed by linked to bending songs,
The power transmission device is
A drive gear meshing with the small rack bar to move the bent pin rack;
One support roller that supports the small rack bar with which the drive gear meshes from the opposite side of the drive gear ;
Comprising one support roller for supporting the bent pin rack from the opposite side of the drive gear ;
The bending pin rack has one end connected to a load body, and can be bent at least in two directions, that is, a side where the driving gear is located and a side opposite to the driving gear,
A pressure angle analyzing step for analyzing a position where a pressure angle of a force applied to the small rack bar meshed with the drive gear is maximized by a pressure angle analyzing means provided in the design apparatus ;
A support roller position determining unit provided in the design apparatus , wherein the support roller position determining unit determines the position of the support roller to a position where the driving gear receives a force of a maximum pressure angle applied to the small rack bar ; and
A design method, comprising: a support roller position determination unit included in a design apparatus, wherein the support roller position determination unit determines a position of the support roller on a side where the load body does not exist with respect to the support roller . The computer program for functioning as a design apparatus according to any one of claims 1 to 3. A power transmission device for transmitting power to the plurality of bent pin rack the small rack bar formed by linked to bending songs,
A drive gear, one support roller, and one support roller ;
The drive gear meshes with one of the small rack bars to move the bending pin rack,
The bending pin rack has one end connected to a load body, and can be bent at least in two directions, that is, a side where the driving gear is located and a side opposite to the driving gear,
The support roller supports the small rack rod engaged with the drive gear from the side opposite to the drive gear at a position where the drive gear receives a force of a maximum pressure angle applied to the small rack rod. ,
The power transmission device , wherein the support roller supports the bending pin rack from a side opposite to the drive gear from a side where the load body is not present than the support roller . At least one of the rack pins of the bent pin rack has a larger diameter than the other rack pins,
The drive gear is
It meshes with a rack pin between the load body and a rack pin having a large diameter,
The power transmission device according to claim 6, wherein meshing is inhibited by the rack pin having a large diameter and does not mesh beyond the rack pin having a large diameter.

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