JP5826776B2 - Rotary clamping machine - Google Patents

Description

  The present invention relates to a rotary tightening machine used for screw tightening and bolt tightening work, and more particularly, to a rotary tightening machine capable of reducing a reaction force generated on a gripping member due to a reaction torque generated during the tightening work. .

  2. Description of the Related Art Conventionally, a rotary automatic tightening machine called an electric screwdriver or a nut runner has been widely used for tightening screws and bolts in an assembly process of automobiles and home appliance parts.

  This type of rotary tightening machine is generally composed of a combination of a rotational drive source motor and a torque amplification gear. As a method for controlling the torque, a clutch mechanism is provided between the power drive source and the output rotation shaft, and when a load exceeding a predetermined torque is applied to the output rotation shaft, the clutch mechanism is operated to perform output rotation. There is a method to control the tightening torque by blocking the transmission to the shaft, or by attaching a torque sensor, transmitting the strain signal of the output rotating shaft from the torque sensor, and cutting off the power of the motor by the electronic control unit. is there.

  As described above, the conventional rotary type tightening machine has various considerations in terms of controlling the tightening torque, but on the other hand, special consideration has been given to the reaction force generated during the screw tightening operation. For this reason, the jig | tool which hold | maintains a rotary type clamping machine became large, or the reaction force receiving jig | tool was needed.

JP 2006-181660 A JP 2011-90618 A

  Accordingly, the present invention has been made in view of these problems, and a rotary type capable of canceling a reaction force generated when a screw or the like is seated with a gripping member during a screw tightening operation or a bolt tightening operation. The main purpose is to provide a tightening machine.

  In order to achieve the above-mentioned object, the present invention employs the following means.

The rotary tightening machine of the present invention is
A casing,
A rotational drive source installed in the casing;
A rotation output shaft connected to the rotation drive source;
A rotation output shaft tip that transmits the rotation of the rotation output shaft to another member;
A first connecting member and a second connecting member attached to the casing;
A holding member fixed to both the first connecting member and the second connecting member;
The first connecting member is provided via a reversing gear so that a reaction force generated when the rotation of the rotation output shaft is suddenly reduced is applied in a direction opposite to the force applied to the second connecting member. It is characterized by.

  The rotary type clamping machine of the present invention has a structure in which a gripping member is attached to a casing via two connecting members, that is, a first connecting member and a second connecting member. Of these two connecting members, one first connecting member is formed such that a force is transmitted in a direction opposite to the direction of the reaction force generated in the casing when a screwing member such as a bolt or a screw is seated. The other second connecting member is formed so that the force is transmitted in the same direction as the reaction force. Accordingly, when the screw or bolt is seated on the gripping member, the reaction force due to the reaction torque applied to the casing is applied in the opposite direction between the first connecting member and the second connecting member. That is, since both the first connecting member and the second connecting member are fixed to the gripping member, the reaction force is canceled and the impact / load applied to the hand gripping the gripping member can be reduced.

  In the rotary type clamping machine of the present invention, the second connecting member may be provided to the casing via a forward gear. The second connecting member is provided with a forward gear to transmit a force in the forward direction, and is provided with a forward gear to arbitrarily provide a reaction force to be transmitted to the second connecting member. It can be increased or decreased. Therefore, it is possible to easily balance the force with the first connecting member, and to easily cancel the force completely. That is, since the first connecting member and the second connecting member are attached to different positions of the casing, the reaction force applied to the first connecting member and the second connecting member may be slightly different due to distortion of the casing or the like. By providing the connecting member via the gear, the magnitude of the reaction force applied to the first connecting member and the second connecting member can be adjusted by adjusting the gear ratio and the like.

  Furthermore, in the rotary type clamping machine of the present invention, the reverse gear may be a planetary gear mechanism. By adopting such a configuration, the reaction force applied to the casing can be converted into a force in the reverse direction using a compact gear. Moreover, the force given to a 1st connection member can be easily adjusted by replacing | exchanging the planetary gear to be used.

  Furthermore, in the rotary type clamping machine according to the present invention, the first connecting member and the second connecting member may be provided in parallel to the output rotating shaft and at different distances from the distal end portion of the rotating output shaft. Good. Therefore, a reaction force is applied to the first connecting member and the second connecting member so as to rotate around the output rotation shaft. By attaching the gripping member so as to straddle the connecting members disposed at different distances from the distal end of the output shaft, a force is applied in the opposite direction to the gripping member, so that the force applied to the gripping member can be canceled efficiently. be able to.

  Furthermore, in the rotary type clamping machine according to the present invention, the ratio of the force transmitted from the forward gear to the second connecting member and the ratio of the force transmitted from the reverse gear to the first connecting member are different. Also good. By adopting such a configuration, for example, when the two connecting members are provided at different distances from the tip of the rotation output shaft, the casing is distorted, and the forward gear and the reverse gear have different sizes. The reaction force of may be transmitted. In such a case, by adjusting the ratio of the respective gears so as to more easily cancel the force transmitted from the forward gear and the force transmitted from the reverse gear, The magnitude of the reaction force transmitted to the second connecting member is the same.

  Furthermore, the gripping member may be formed so as to be grippable in parallel with the rotation output shaft. By adopting such a configuration, the reaction force can be canceled before and after the gripping member. Further, by providing the gripping member in parallel with the output rotation shaft, it is possible to provide a rotary tightening machine that is easy to operate.

  Furthermore, in the rotary type clamping machine of the present invention, the connecting member may be formed to be extendable and contractible. By adopting such a configuration, the distance between the casing and the grip portion can be increased. Therefore, it is easy to move the tip of the rotary output shaft to a place out of reach. Moreover, in this invention, since the force of the opposite direction each acts with respect to a 1st connection member and a 2nd connection member, and a force is offset by a holding member, the 1st connection member and the 2nd connection member were formed long. It is possible to maintain a state where the load or impact applied to the gripping hand is reduced.

  Furthermore, in the rotary type clamping machine of the present invention, a plurality of start switches for the rotational drive source may be provided on the gripping part. By adopting such a configuration, it is possible to make the grip portion easy to operate even when the grip portion is held in various methods or directions.

  As a rotary type clamping machine according to the present invention, a reaction force generated when a screwing member such as a screw or a bolt is seated at the time of tightening work is reduced, and good workability is achieved. It is possible to provide a rotary tightening machine that can reduce the load or impact applied to the arm and ensure safety.

FIG. 1 is a schematic side view showing a rotary clamping machine 100 according to the embodiment from the side. FIG. 2 is a schematic side view of the rotary clamping machine 100 showing a state in which the connecting member is extended from the side. Drawing 3 is an AA sectional view showing the attachment state of the 1st connecting member of rotary type clamping machine 100 concerning an embodiment. Drawing 4 is a BB sectional view showing the attachment state of the 2nd connecting member of rotary type clamping machine 100 concerning an embodiment. Drawing 5 is a sectional view showing another embodiment of the attachment state of the 2nd connecting member of rotary type clamping machine 100 concerning an embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  A rotary clamping machine 100 according to this embodiment will be described. FIG. 1 is a schematic side view showing a main part of the rotary clamping machine 100 from the side. The rotary tightening machine 100 is a hand tool type bolt tightening machine, which mainly converts a casing 1, a rotational drive source 10 including a motor and the like, and a rotational speed and torque obtained by the rotational drive source 10. The gear box 20, the rotation output shaft 30 that transmits the rotation obtained from the gear box 20 to the tip, the torque transducer 40 that measures the torque of the rotation output shaft 30, and the driver, ratchet or socket. Rotating output shaft tip 31 for transmission, two first connecting members 51 and second connecting members 52 connected to casing 1, and gripping member 60 attached to the two connecting members 50 are provided. Yes.

  The casing 1 is a member mainly having a role of a housing member that holds the rotation drive source 10, the gear box 20, the rotation output shaft 30, and the torque transducer 40 therein. The rotational drive source 10, the gear box 20 and the torque transducer 40 are fixed inside the casing 1, and a reaction force is generated in the casing when a reaction torque is generated in the rotation output shaft 30.

  The rotational drive source 10 transmits rotational power to the gear box 20 and generally comprises an electric motor.

  The gear box 20 is connected to the rotary shaft 11 of the rotary drive source 10, converts the rotational speed and torque intensity, and transmits the converted rotational speed and torque intensity to the rotary output shaft 30. For example, the gear box 20 is formed by a planetary gear mechanism, and the rotation of the rotation shaft 11 of 1000 rpm obtained by the rotation drive source 10 is reduced to 100 rpm and transmitted to the rotation output shaft 30, and the torque strength is increased 10 times. Thus, the rotational speed and torque intensity can be converted. Of course, the amount of change in the rotational speed and torque intensity is not limited to this, and an arbitrary amount of change can be set as appropriate.

  The rotation output shaft 30 is a main shaft for transmitting the rotational force from the gear box 20 to a driver, a socket type wrench or the like attached to the tip end portion 31 of the rotation output shaft. The rotary output shaft tip 31 can be freely replaced with a screwdriver, a socket-type wrench or the like.

  The torque transducer 40 can measure the torque strength and strain of the rotary output shaft 30, and can transmit various signals to a known control circuit (not shown). Using the control means that has received this signal, for example, the power of the rotary drive source 10 can be shut off, or the tightening torque can be controlled.

  The connecting member 50 extends in the lateral direction with respect to the casing 1 so as to have different distances from the distal end portion 31 of the rotation output shaft, and the first connecting member 51 and the second connecting member 52 are formed. Accordingly, the first connecting member 51 and the second connecting member 52 are disposed on the surface of the casing 1 along the axial direction of the rotary output shaft 30. As shown in FIG. 2, the connecting member 50 is formed in a rod shape, and the first connecting member 51 includes an inner 51a and an outer 51b, and the first connecting member 51 is pulled out from the outer 51b. Similarly, the second connecting member 52 includes inner 52a and 52b, and the length of the second connecting member 52 can be extended by pulling the inner 52a out of the outer 52b. it can.

  The first connecting member 51 is attached to the casing 1 via the reversing gear 70. As shown in FIG. 3, the reverse gear 70 is made of a planetary gear mechanism, and is provided on the outer periphery of the sun gear 71, the planetary gear 72, and the planetary gear 72 formed on a part of the casing 1. An internal gear 73 fixed to the first connecting member 51 is provided. Therefore, the first connecting member 51 is applied in a direction opposite to the reaction force applied to the casing 1.

  On the other hand, the second connecting member 52 is directly connected to the casing 1. Therefore, a force is applied in the same direction as the direction of the reaction force applied to the casing 1.

  The gripping member 60 is coupled to both the first coupling member 51 and the second coupling member 52 that are formed along the longitudinal direction of the casing 1. The gripping member 60 is formed in a substantially rectangular plate shape having an opening hole 61 at the center so that it can be easily gripped, and the grip portion 62 gripped by hand is disposed in the direction of the rotation output shaft 30. In addition, start switches 64 are provided on three sides excluding the grip portion 62. Thereby, even if the holding member 60 is changed in accordance with the tightening direction, one of the start switches 64 can be operated, and the work can be easily performed.

  A description will be given of the function of the rotary type clamping machine 100 configured as described above and its function. The rotary clamping machine supplies power or air to a motor that is a rotational drive source 10 in a state where, for example, a socket is attached to the distal end portion 31 of the rotational output shaft. A clockwise rotational force of about 1000 rpm is applied. This rotational force is converted by the gear box 20 into a rotational speed appropriate for bolting, for example, about 100 rpm, and the rotational output shaft 30 is given rotational force. The torque transducer 40 measures the distortion from the rotary output shaft 30 using a magnitude of the torque and optionally a strain gauge, and transmits various signals to a known control circuit (not shown). When the bolt is tightened from this state, the reaction torque hardly occurs during the slight acceleration / deceleration rotation motion or constant speed rotation motion at the time of bolt tightening. When the bolt is further tightened and the seat surface of the bolt is seated, a reaction torque is generated and the bolt is tightened to the target torque. The reaction torque generated at this time is transmitted to the casing 1, and the casing 1 generates a counterclockwise reaction force that is opposite to the rotation output shaft 30 and rotates to the left. Then, since the 1st connection member 51 is provided with the inversion gear 70 which has a planetary gear mechanism between the casing 1 and the 1st connection member 51, it is set as the sun gear 71 by the tooth | gear formed in the outer periphery of the casing 1. The rotational force in the left direction of the casing 1 having the above function is applied to the internal gear 73 by the planetary gear 72 so as to rotate in the right direction that is opposite to the casing 1. Therefore, the first connecting member 51 is applied with a force that rotates in the right direction as indicated by an arrow α. On the other hand, since the second connecting member 52 is directly attached to the casing 1, the reaction force applied to the casing 1 is applied to the second connecting member 52 as it is, and a force to rotate leftward is applied as indicated by the arrow β. become. As described above, the reaction force generated by the reaction torque generated in the tightening operation is rotated clockwise when transmitted to the first connecting member 51, and rotated counterclockwise when transmitted to the second connecting member 52. The reaction force applied to these connecting members 50 is transmitted to the gripping member 60 connected to the tip. At that time, a reaction force is applied to the gripping member 60 so as to twist in directions opposite to each other, thereby canceling the reaction force. Therefore, the impact of the reaction torque of the casing 1 on the gripping member 60 can be considerably reduced, and the gripping member 60 hardly receives any force other than the weight of the rotary clamping machine. For this reason, the burden of the reaction force given to an operator can be reduced, and it becomes unnecessary to attach a reaction force absorption jig anew. Therefore, since it is not necessary to consider the force applied to the gripping member 60 due to the reaction torque, the force applied to the gripping member 60 does not change so much even if the connecting member 50 is long or short. It can be made.

  The present invention is not limited to the above-described embodiment, and can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the embodiment described above, an electric motor is used as the rotational drive source 10, but the present invention is not limited to this, and an air motor or the like may be used.

  Further, in the above-described embodiment, the first connecting member 51 and the reverse gear 70 are provided at a position close to the rotation output shaft tip 31, and the second connection member 52 is disposed on the casing at a position far from the rotation output shaft tip 31. Although formed integrally, the first connecting member 51 and the reverse gear 70 are provided at a position far from the rotation output shaft tip 31, and the second connection member 52 is placed on the casing 1 at a position near the rotation output shaft tip 31. You may form integrally.

  Further, when the casing 1 and the second connecting member 52 are formed integrally, the casing 1 and the second connecting member 52 are prepared separately, and are finally fixed by a bolt or the like. It may be integrated.

  In the above-described embodiment, the casing 1 and the second connecting member 52 are integrally formed. However, as shown in FIG. 5, the second connecting member 52 is formed via a single forward rotation gear 75. May be. By attaching the internal gear 77 to the teeth 76 of the casing 1 in this way, the magnitude of the reaction force applied to the second connecting member 52 can be adjusted by the size of the outer periphery of the internal gear 77. Therefore, in the case where the first connecting member 51 and the second connecting member 52 are attached to the casing 1 at a distance from each other, the difference in the reaction force caused by the distortion of the casing 1 is adjusted to efficiently cancel the difference. Can do.

  In the above-described embodiment, the torque transducer 40 is used. However, it is not always necessary to attach the torque transducer.

  As shown in the above-described embodiment, the present invention can be industrially used as a rotary fastening tool such as a bolt fastening machine.

DESCRIPTION OF SYMBOLS 10 ... Rotation drive source, 11 ... Rotation shaft, 20 ... Gear box, 30 ... Rotation output shaft, 31 ... Rotation output shaft tip, 40 ... Torque transducer, 50 ... Connection member, 50a ... First connection member, 50b ... First 2 connecting members, 51 ... first connecting member, 51a ... inner, 51b ... outer, 52 ... second connecting member, 52a ... inner, 60 ... gripping member, 61 ... opening hole, 62 ... grip part, 70 ... reversing gear, 71 ... Sun gear, 72 ... Planetary gear, 73 ... Internal gear, 75 ... Forward gear, 76 ... Teeth, 77 ... Internal gear, 100 ... Rotary tightening machine

Claims (8)

A casing,
A rotational drive source installed in the casing;
A rotation output shaft connected to the rotation drive source;
A rotation output shaft tip that transmits the rotation of the rotation output shaft to another member;
A first connecting member and a second connecting member attached to the casing;
A gripping member fixed to both the first connecting member and the second connecting member ,
The first connecting member is provided via a reversing gear so that a reaction force generated when the rotation of the rotation output shaft is suddenly reduced is applied in a direction opposite to the force applied to the second connecting member. A rotary clamping machine characterized by   The rotary tightening machine according to claim 1, wherein the second connecting member is provided to the casing via a forward rotation gear.   The rotary tightening machine according to claim 1 or 2, wherein the reverse gear is a planetary gear mechanism. The first connecting member and the second connecting member are formed to extend in a lateral direction with respect to the casing, and are provided at different distances from the distal end portion of the rotation output shaft. Item 4. The rotary tightening machine according to any one of Items 1 to 3. 3. The rotary clamping machine according to claim 2, wherein a ratio of a force transmitted from the forward rotation gear to the second connection member is different from a ratio of a force transmitted from the reverse gear to the first connection member. .   The rotary clamping machine according to any one of claims 1 to 5, wherein the gripping member is formed so as to be grippable in parallel with the rotation output shaft.   The rotary tightening machine according to any one of claims 1 to 6, wherein the first connecting member and the second connecting member are formed to be extendable and contractible. The rotary clamping machine according to any one of claims 1 to 7, wherein a plurality of activation switches for the rotational drive source are provided on the gripping member.

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