JP2015140914A - belt actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem by changing a conventional bevel gear to a face gear and utilizing the characteristics of the face gear.SOLUTION: In a belt actuator in which a belt is bridged over between a pair of pulleys and rotational power is transmitted from a driving source to one pulley, face gears 10, 21, 22, 26 are provided in a support shaft 9of a pulley 2to which power is transmitted from the drive source 7, and a gear provided in the output shaft of the drive source 7 is engaged to the face gears 10, 21, 22, 26.

Description

  The present invention relates to a belt actuator that can save space by using a face gear for power transmission.

  Conventionally, as this type of belt actuator, a long base extending in the longitudinal direction, a plurality of tables attached to the base via a motion guide device so as to be movable in the longitudinal direction, and the table are moved. A belt actuator is known that includes a belt, a pair of rotating members (pulleys) wound around the belt, and a drive member that drives the belt. In such a belt actuator, when the rotating member (pulley) is driven by a motor, the motor is attached at a right angle to the driving guide device which is the moving direction of the table. In other words, since the motor protrudes in the longitudinal direction of the driving guide device, when the belt actuator is attached to the device, the motor part becomes a dead space and the attachment direction is limited. was there.

As a structure for solving this problem, for example, a structure shown in Patent Document 1 is known.
The belt actuator described in Patent Document 1 is connected to a first bevel gear, a shaft of the first bevel gear, a rotating member (pulley) that supports the belt, and a gear tooth of the first bevel gear. It has an output shaft that pivotally supports the meshing second bevel gear. The output shaft of the motor to which the second bevel gear is connected and the rotation shaft of the rotating member (pulley) that holds the first bevel gear are engaged at right angles or obliquely. Therefore, the motor can be arranged without protruding from the longitudinal direction of the driving guide device.

JP-A-5-180296

  However, in such a conventional belt actuator, since the bevel gear is coupled to the motor shaft, there are many parts that are difficult to save space. Further, there has been a problem that the reduction ratio cannot be changed without disassembling the mechanism portion.

  The present invention has been made paying attention to such conventional problems, and aims to solve the above problems by changing the conventional bevel gear to a face gear and utilizing the characteristics of the face gear. .

In order to solve the above problems, the present invention provides a belt actuator that drives a belt between a pair of pulleys by transmitting a rotational power from a drive source to one pulley, and the power is transmitted from the drive source. A face gear is provided on the support shaft of the pulley, and a gear provided on the output shaft of the drive source is engaged with the face gear.
In the present invention, a plurality of face gears having different diameters are concentrically disposed on the support shaft, and the face gears are mounted so as to be movable in the axial direction and meshed with the gears of the output shaft. The gear ratio can be selected by selecting a gear.
Furthermore, the present invention lies in that the output shaft of the drive source is provided so as to be orthogonal to the support shaft of the face gear.
Furthermore, the present invention lies in that a drive source is provided in the longitudinal direction of the belt.
Further, the present invention resides in that a guide block for assembling a moving body is mounted on the belt.

According to the present invention, by using the face gear, it is possible to save space as compared with the conventional one and to reduce the number of parts.
Also, a plurality of face gears with different diameters are concentrically arranged on the support shaft, and each face gear is mounted so as to be movable in the axial direction, and a face gear to be engaged with the gear of the output shaft of the drive source is selected. By doing so, the gear ratio can be selected, so there is no change or disassembly of parts, and the gear ratio can be changed as necessary.
Further, since the output shaft of the drive source is provided so as to be orthogonal to the support shaft of the face gear, space saving can be achieved.

It is a perspective view which shows the belt actuator which concerns on one embodiment of this invention. It is a perspective view which shows the mechanism part of the belt actuator of FIG. (A) is a front view of FIG. 1, (b) is the sectional view on the AA line of (a). It is a longitudinal cross-sectional view which shows the belt actuator which concerns on other embodiment of this invention. It is a perspective view which shows the face gear of FIG. It is a longitudinal cross-sectional view which shows the belt actuator which concerns on other embodiment of this invention. It is a perspective view which shows the face gear of FIG. It is a perspective view which shows the modification of a face gear.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS.

1 to 3, the belt actuator 1, first a pulley casing 3 ₁ having a built-in first pulley 2 _1, second a pulley casing 3 ₂ with a built-in second pulley 2 _2, first pulley 2 ₁ and the second pulley 2 ₂ endless belt 4 which spans between a table block 5 that is operated by the belt 4, the first pulley case 3 ₁ and the second pulley case is arranged between the 3 _2, a housing 6 with a built-in belt 4 and the table block 5, on the outer side of the first pulley case 3 _1, of the belt 4 are arranged along the longitudinal direction, the first and a drive source 7 for driving the pulley 2 _1.

Wherein the first pulley case 3 _1, the pulley shaft 9 ₁ rotatably supporting both ends via a pair of bearings 8 ₁ built above and below the hollow portion 3a of the case is provided in a vertical direction and has the first pulley 2 ₁ is mounted is supported on the axis to the pulley shaft 9 _1. Bearing 8 ₁ of the upper and lower is engaged in the hollow portion 3a by a shaft receiving wheel 8a outside. This is the pulley shaft 9 _1, the bottom side of the first pulley 2 _1, a ring-shaped face gear 10 tooth groove 10a is engraved on the periphery of the upper surface is mounted. A motor 11 is employed as the drive source 7, and a tooth groove 11 b that meshes with a tooth groove 10 a provided at the peripheral edge of the face gear 10 is cut into the output shaft 11 a of the motor 11. Is provided. The tooth groove 11b of the output shaft 11a is directly subjected to helical or straight tooth cutting.

The second to the pulley casing 3 _2, pulley shafts 9 ₂ the both end portions via a pair of bearings ₈₂ which are built above and below the hollow portion 3a is rotatably supported inside the casing disposed in a vertically and, the second pulley 2 ₂ is mounted is supported on the axis to the pulley shaft 9 _2. Bearings 8 ₂ of the upper and lower is engaged in the hollow portion 3a by a shaft receiving wheel 8a outside. Said second pulley casing 3 ₂ is the belt tension plate 12 is provided on the lower surface side, by adjusting the position of the second pulley case 3 _2, the distance between the first position of the pulley casing 3 ₁ Thus, the belt 4 is set to be able to apply tension.

The housing 6 which incorporates the belt 4 and the table block 5, wherein the first pulley case 3 ₁ and disposed in the second pulley case 3 ₂ mutual, disposed a predetermined length of the cross section on the lower surface A substantially U-shaped frame 13, left and right substantially inverted L-shaped side covers 14 that are disposed on both side walls 13 a of the frame 13 so as to be closed from the left and right openings to the upper surface, and the side covers 14. And a center cover 15 that closes the gap therebetween.
Inside the frame 13, a guide rail 16 having a predetermined length is provided along the longitudinal direction. A guide block 16a is slidably assembled by being guided by the guide rail 16.

  The guide block 16a has a U-shaped sliding portion 5a that is assembled across the guide rail 16 on the lower surface side, and the table block 5 is assembled on the U-shaped upper surface of the guide block 16a. . In the table block 5, an opening 5b through which the belt 4 is inserted is formed on the upper side of the assembly surface of the guide block 16a in the moving direction, and a narrow neck portion located in a gap between the side covers 14 above the opening 5b. 5c is provided, and a flat plate portion 5d facing the upper surface of the side cover 14 is provided on the neck portion 5c, and table portions 5e extending upward through both sides of the center cover 15 are provided on both sides of the flat plate portion 5d. It has been. It is comprised so that a mobile body may be assembled | attached to this table part 5e. One side of the belt 4 is fixed to the table block 5 via a belt fixing bracket 17 provided in the opening 5b of the table block 5, and the table block 5 is moved to the guide rail as the belt 4 moves. 16 is configured to slide along the line 16.

Next, the operation of the belt actuator 1 will be described.
When the motor 11 as the drive source 7 is operated, the tooth gear 10a of the face gear 10 is engaged with the tooth groove 11b of the output shaft 11a of the motor 11, so that the face gear 10 starts to rotate. Then, the pulley shaft 9 ₁ rotates with the rotation of the face gear 10, the first pulley 2 ₁ supported by the pulley shaft 9 ₁ starts rotating. When the first pulley 2 ₁ starts to rotate, the first pulley 2 ₁ including bridged endless belt 4 which is rotated in a second pulley 2 between _2, table mounted on the belt 4 The block 5 starts to move along the guide rail 16 with the movement of the belt 4. Since the table block 5 is fixed by the belt fixing bracket 17, the table block 5 linearly moves in synchronization with the belt 4. Then, by assembling the movable body to be conveyed to the table portion 5e of the table block 5, the movable body attached to the table portion 5e can be moved along with the movement of the table block 5. The moving body can be reciprocated by rotating the motor 11 forward and backward.

At this time, when the belt 4 is loosened and the tension is lowered, the position of the _second pulley case 32 with respect to the belt tension plate 12 is adjusted by adjusting an adjustment screw 18 provided on the belt tension plate 12 with an arrow B. By sliding as described above, the tension of the belt 4 can be adjusted.

  Next, FIGS. 4 to 7 show another embodiment of the present invention. In this case, the same parts as those in FIG. 3 are denoted by the same reference numerals and the description of the same parts is omitted.

Two types of ring-shaped face gears 21 and 22 having different diameters are assembled concentrically. These face gears 21 and 22 are configured to be movable in the axial direction. In the embodiment shown in FIGS. 4 and 5, the low-speed face gear 22 on the outer peripheral side is assembled so as to protrude upward. The face gear 21 is formed a screw hole 23 on the outer peripheral surface, screwed to the face gear flange 25 attached by set screws (not shown) to the pulley shaft 9 ₁ via the screw 24 into the screw hole 23 The face gears 21 and 22 are fixed.
In this way, the tooth groove 11b of the output shaft 11a of the motor 11 is engaged with the tooth groove 22a of the low-speed face gear 22 on the outer peripheral side, and the face gear 22 is rotationally driven.

  6 and 7, the inner peripheral high-speed face gear 21 is assembled so as to protrude upward. In this case, the tooth groove 11b of the output shaft 11a of the motor 11 is engaged with the tooth groove 21a of the high-speed face gear 21 on the inner peripheral side, and the face gear 21 is rotated at high speed.

  Thus, by selecting the face gears 21 and 22 that mesh with the tooth grooves 11b of the output shaft 11a of the motor 11, the gear ratio can be easily selected. Further, since the gear ratio can be changed as needed without disassembling the belt actuator 1, the work efficiency is improved.

  It is also possible to select another three gear ratios by assembling another face gear 26 having an ultra-low speed tooth groove 26a outside the face gears 21 and 22. The gear ratio in this case is 1/5, 1/4, and 1/3 from the outside.

  As described above, according to the above-described embodiment, the use of the face gears 10, 21, 22, and 26 can save space with respect to a structure that conventionally uses a bevel gear or the like. And the number of parts can be reduced. In the case of the face gears 10, 21, 22, and 26, since the teeth are not tapered, the output shaft 11a can be directly geared. Therefore, there is no need for a separate part pinion for fastening to the output shaft 11a like a bevel gear, and space saving and downsizing can be achieved.

  In the present embodiment, the rotational power is taken out by meshing the face gear with the gear provided on the output shaft 11a of the motor 11, but the drive power other than the motor, for example, the engine or the like is connected via the gear. The rotational power may be taken out by decelerating. In this case, rotational power can be transmitted by interposing the face gear at any location. In the above embodiment, the gear ratio is changed using a combination of 1 to 3 face gears. However, the gear ratio can be changed using a combination of a larger number of face gears. Further, the configuration in which the gear ratio is changed by using a combination of a large number of face gears can be applied to other than the belt actuator. In addition, it goes without saying that the present invention can be appropriately modified and implemented without changing the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Belt actuator 2 ₁ 1st pulley 2 ₂ 2nd pulley 3 ₁ 1st pulley case 3 ₂ 2nd pulley case 4 Belt 5 Table block 6 Housing 7 Drive source 8 ₁ , 8 ₂ Bearing 9 ₁ , 9 ₂ Pulley shaft 10 Face gear 10a Tooth groove 11 Motor 11a Output shaft 11b Tooth groove 12 Belt tension plate 13 Frame 14 Side cover 15 Center cover 16 Guide rail 16a Guide block 21, 22, 26 Face gear 21a, 22a, 26a Tooth groove

Claims (5)

  In a belt actuator that drives a belt between a pair of pulleys by transmitting rotational power from a drive source to one pulley, a face gear is provided on a support shaft of the pulley that receives power from the drive source. A belt actuator characterized in that a gear provided on an output shaft of the drive source is engaged with a face gear.   A plurality of face gears having different diameters are concentrically arranged on the support shaft, and each face gear is mounted so as to be movable in the axial direction, and a face gear to be engaged with the gear of the output shaft is selected. The belt actuator according to claim 1, wherein a gear ratio is selectable.   The belt actuator according to claim 1 or 2, wherein an output shaft of the drive source is provided so as to be orthogonal to a support shaft of the face gear.   The belt actuator according to any one of claims 1 to 3, wherein a drive source is provided in a longitudinal direction of the belt.   The belt actuator according to claim 1, wherein a guide block for assembling a moving body is attached to the belt.

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