JPH08336761A - Hydraulic wrench - Google Patents

Abstract

PURPOSE: To provide a hydraulic wrench that can carry out bolt-nut stening/loosening work suitable for a working robot for power distribution with the same wrench, with no need to be regripped cording to the direction of a working position. CONSTITUTION: An insulating holder 4 is provided to insert-fit a hydraulic motor 1 into the intermediate part from the base end. One shaft 11 of a transmission gear 9 is connected to the output shaft 3 of the hydraulic motor 1 through an insulating coupling 7, and a cup-like driving shaft 19 is provided at the base end part of the output shaft 17 of a speed reducer 16 connected to the other shaft 12 of the transmission gear 9. The output shaft 17 of the speed reducer 16 is insert-fitted into the driving shaft 19. A one-way clutch 25 is provided between the inner surface of the driving shaft 19 and the base end part of a wrench output shaft 23 with a socket 24 additionally provided at the tip, and a torque limiter 37 is provided at the tip of the driving shaft 19 and the intermediate outer surface of the output shaft 23. A gripper holding piece 43 is provided to rotatably insert-fit the intermediate part of the insulating holder 4 from its base end. The tip part of the insulating holer 4 is formed into a polygonal shape part 41, and an angle positioning piece 46 is provided to insert-fit this polygonal shape part 41 slidably. The mutually facing tip and base end of the respective pieces are provided with engaging pawls 45 and pawls 47.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic wrench in which sockets such as bolts and nuts are rotated by a hydraulic motor.

In particular, in the tightening rotation (right) direction, the rotation of the hydraulic motor acts through the torque control mechanism, and in the loosening rotation (left) direction, the rotation acts through the direct drive transmission mechanism. Regarding the wrench.

[0003]

2. Description of the Related Art Conventionally, a torque regulation type and an impact type have been used for mounting / removing (tightening / loosening of bolts / nuts) of various facilities and equipment in distribution work. .

Further, the wrench as the torque regulation system has a torque regulation device for idling the output shaft so as not to tighten the bolts and nuts with excessive force when a constant load is applied to the output shaft. There is.

Further, in the impact type wrench, when a constant load is applied to the output shaft, the hammer retracts to the motor side, and at the next moment, the hammer advances again due to the spring force of the spring to exert a large power and output. The shaft is struck in the direction of rotation of bolts and nuts or in the opposite direction of rotation.

[0006]

[Problems to be Solved by the Invention] Conventionally, the above-mentioned various facilities,
When installing and removing equipment, etc., if the tightening bolts and nuts do not give more torque than when tightened due to rust, etc.
There was a problem that the bolts and nuts could not be loosened.

Therefore, with the conventional torque control type wrench, there is no problem when tightening the bolts and nuts at the time of mounting various equipments and equipments, but the bolts and nuts tightened to various equipments and equipments cannot be loosened. When removing various equipment and equipment, the output shaft is loosened using an impact type wrench and the bolts and nuts are loosened by striking in the direction of rotation.

However, since the impact type wrench loosens the output shaft and strikes it with a hammer in the rotational direction to loosen the bolts and nuts, it has a drawback that noise and vibration are severe and the working environment is significantly deteriorated.

Further, in recent years, in the work of distribution work, in order to improve the working environment and save labor from the conventional manual work, the mechanization of this kind of work has progressed, and a distribution work robot (manipulator) has been developed. The gripper tool of the manipulator requires an operation of exchanging and gripping the torque regulation type and impact type wrenches according to the tightening work and the loosening work, which is a troublesome operation.

According to the present invention, bolts and nuts suitable for a distribution work robot (manipulator) developed for mechanization of distribution work can be tightened and loosened with the same wrench, and there is no need to change the grip depending on the work position direction. It is an object of the present invention to provide a hydraulic wrench that is free from noise and vibration and that can improve the working environment.

[0011]

In order to achieve the above object, the present invention provides a hydraulic wrench in which a socket such as a bolt and a nut is rotated by a hydraulic motor via a torque control mechanism. Provided is a transmission device in which two shafts, such as a set of bevel gears, in which one shaft is connected to the shaft through a joint or an insulating joint, form a right angle or an angle.

Further, during tightening rotation, a reduction gear provided on the other shaft of the transmission is rotated through a torque regulating mechanism.
Provide a wrench output shaft with a socket attached to the tip.

At the same time, a direct drive transmission mechanism for directly connecting the output shaft of the hydraulic motor and the wrench output shaft when loosening and rotating is provided at the tip end of the reduction gear output shaft and the base end of the wrench output shaft.

That is, an insertion hole for inserting the reduction gear output shaft is provided from the base end portion to the intermediate portion of the wrench output shaft, and the reduction gear output shaft is rotatably inserted into the insertion hole, so that the wrench output shaft base is A cup-shaped drive shaft into which the end portion is inserted is provided, and the base end portion of the cup-shaped drive shaft is fixed to the reducer output shaft base end portion.

A one-way clutch is provided as a direct drive transmission mechanism at the base end portion between the cup-shaped drive shaft and the wrench output shaft, and a torque regulation mechanism is provided between the tip end portion of the cup-shaped drive shaft and the intermediate outer peripheral portion of the wrench output shaft. Provide a torque limiter.

Further, a joint or an insulating joint interposed between the output shaft of the hydraulic motor and a pair of transmission gears such as a bevel gear is inserted into the distal end portion so that the hydraulic motor can be inserted and removed from the intermediate portion to the proximal end portion. Provide an insulating holder for fitting.

Further, a gripper gripping piece having a base end portion rotatably inserted from the intermediate portion of the insulating holder is provided in the insulating holder in a non-removable manner, and an engaging claw is provided at the tip of the gripper gripping piece.

Furthermore, the outer surface of the tip of the insulating holder is formed into a polygonal portion, and a claw that engages with the engaging claw is formed at the base end thereof, and the polygonal portion of the insulating holder is slidably inserted. An angle positioning piece is provided.

Then, the angular positioning piece is slid toward the tip of the insulating holder to disengage the claw of the angular positioning piece from the engaging claw of the gripper gripping piece tip, and the hydraulic wrench body is rotated 360 ° together with the insulating holder. Be free to move.

[0020]

The wrench output shaft 23 is provided with an insertion hole 30 for inserting the reduction gear output shaft 17 from the base end portion to the intermediate portion thereof, and the reduction gear output shaft 17 is rotatably inserted into the insertion hole 30. The cup-shaped drive shaft 19 into which the base end of the output shaft 23 is inserted
Is provided, and the bottom surface 19a of the cup-shaped drive shaft 19 is fixed to the base end portion of the speed reducer output shaft 17.

A one-way clutch 25 is provided as a direct drive transmission mechanism between the inner surface of the cup-shaped drive shaft 19 and the base end portion of the wrench output shaft 23, and the tip end portion 19b of the cup-shaped drive shaft 19 and the intermediate outer periphery of the wrench output shaft 23 are provided. A torque limiter 37 is provided between the parts as a torque restriction mechanism.

In this way, two shafts such as a set of bevel gears 10, 10 in which one shaft 11 is connected to the output shaft 3 of the hydraulic motor 1 via a joint or an insulating joint 7 form a right angle or an angle. The other shaft 12 of the device 9 is provided with a wrench output shaft 23 having a socket 24 attached to the tip end thereof, which rotates from the speed reducer 16 via a torque limiter 37 of a torque control mechanism during tightening rotation, and the speed reducer output shaft 17 is provided. A one-way clutch 25 of a direct drive transmission mechanism that directly connects the output shaft of the hydraulic motor and the wrench output shaft when loosening is provided on the inner surface of the cup-shaped drive shaft 19 fixed to the base end of the Therefore, at the time of rotation in the tightening direction, the one-way clutch 25 idles to operate the torque regulation mechanism, and conversely, at the time of rotation in the loosening direction, the one-way clutch 25 is operated. By directly connecting the output shaft 3 and the wrench output shaft 23 of the hydraulic motor, the torque limiter 3
The direct drive transmission mechanism works regardless of 7.

Further, a joint or an insulating joint 7 interposed between the output shaft 3 of the hydraulic motor 1 and a set of bevel gears 10, 10 or the like is inserted into the tip portion of the hydraulic motor 1 so as to be insertable and removable, and from the middle portion. An insulating holder 4 into which the hydraulic motor 1 is inserted is provided at the base end portion, and a gripper gripping piece 43 into which the base end portion is rotatably inserted from the middle portion of the insulating holder 4 is provided in the insulation holder 4 so as not to be removed. An engaging claw 45 is provided at the tip of the gripper grip piece 43.

The outer surface of the tip of the insulating holder 4 is a polygonal portion 41, and a claw 47 that engages with the engaging claw 45 is formed at the base end thereof, and the polygonal portion 4 of the insulating holder 4 is formed.
Since the angle positioning piece 46 for slidably inserting 1 is provided, the angle positioning piece 46 is slid in the direction of the tip of the insulating holder 4, and the claw 47 of the angle positioning piece 46 and the tip of the gripper gripping piece 43 are engaged. When the engagement with the claw 45 is released, the hydraulic wrench main body 49 including the wrench output shaft 23, the one-way clutch 25, the torque limiter 37 and the like can be rotated 360 ° together with the insulating holder 4.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description will be given below with reference to the accompanying drawings showing an embodiment of the present invention.

FIG. 1 shows an assembled state of the hydraulic wrench of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a view of FIG. 1 taken in the direction of arrow B, and FIG. FIG. 5 shows an assembled state of the gripper gripping piece and the angle positioning piece on the insulating holder, FIG. 5 shows an angle adjustment state of the wrench, and FIG. 6 shows an operating mechanism of the one-way clutch.

Reference numeral 1 shown in FIG. 1 denotes a hydraulic motor which is inserted from the base end of a polyacetal resin (POM) insulating holder 4 to an intermediate portion thereof, and a hydraulic pressure of, for example, 140 kgf / cm ² from a hydraulic power source (not shown) of the vehicle. Is supplied by the coupler 2 via a hydraulic hose (not shown) to rotate the hydraulic motor output shaft 3.

Then, a partition wall 5 provided in the intermediate portion of the inner surface of the insulating holder 4 for inserting the hydraulic motor output shaft 3 is inserted into an insulating joint 7 formed at the tip of the insulating holder 4, and a hexagonal hole is formed from an insertion hole 8 of the insulating joint 7, which will be described later. Secure with attached bolts 6 etc.

The insulating joint 7 is made of polyacetal resin (P
OM), one end of which is the output shaft 3 of the hydraulic motor, and the other end of which is one shaft 11 of a transmission device 9 including a pair of bevel gears 10 and 10 having mutually orthogonal shafts 11 and 12 orthogonal to each other.
Is inserted and the rotation of the hydraulic motor 1 is transmitted to the other shaft 12.

Needless to say, the insulating holder 4 and the insulating joint 7 do not need to be made of an electrically insulating material when they are used in applications that do not require electrical insulation.

Further, the transmission device 9 includes a set of bevel gears 10,
The bearing 10 is supported by bearings 13 and 13 so that the shafts 11 and 12 are orthogonal to each other, and the bearings 13 and 13 are inserted into a bearing box 15 in which snap rings 14 and 14 are fixed.

In this embodiment, the mutual axes 11 and 12 are orthogonal to each other, but they may be set to any angle that is not orthogonal.

The other shaft 12 of the bevel gears 10, 10 also serves as the speed reducer input shaft of the ring planetary gear reducer 16 fixed to the bearing box 15, and the speed reducer output shaft 17 thereof serves as the bearing box 15.
Together with the cover receiver 18 inserted around the front end of the bearing box 15 is projected in the front end direction of the bearing box 15.

Then, the bottom surface 19a of the cup-shaped drive shaft 19 is inserted through the hole 18a formed in the upper surface of the cover receiver 18, and the bottom surface 19a is fixed to the base end portion of the speed reducer output shaft 17, and the cup-shaped drive shaft 19 is formed. Outer circumference of the bottom and the cover receiver 1
The bearings 20 are mounted on the inner surface of the drive shaft 8, and the snap rings 21, 2 on the inner surface of the cover receiver 18 and the outer periphery of the drive shaft 19, respectively.
Fix at 2.

Reference numeral 23 is a wrench output shaft having a socket 24 for bolts and nuts formed at the tip, and the outer periphery of the base end portion can be inserted into the inner surface of the cup-shaped drive shaft 19, and the outer periphery of the base end portion of the wrench output shaft 23 can be inserted. A one-way clutch 25 is provided as a direct drive transmission mechanism between the and the inner surface of the cup-shaped drive shaft 19.

As shown in FIGS. 6A and 6B, the one-way clutch 25 has rollers 28 supported by an outer ring 26 having a cam surface 26a on its inner surface and a cage 27, and the rollers 28 and the cage 27. In the meantime, a metal spring 29 for pushing the roller 28 toward the cam surface 26a of the outer ring 26 is formed.

Then, as shown in FIG. 6A, when the wrench output shaft 23 rotates in the counterclockwise direction (the loosening rotation direction) with respect to the outer ring 26, that is, the cup-shaped drive shaft 19, it is supported by the retainer 27. By the spring action of the metal spring 29, the roller 28 advances to the engagement position of the cam surface 26a of the outer ring 26, and the wedge action between the cam surface 26a of the outer ring 26 and the wrench output shaft 23 causes the wrench output shaft 23 and the outer ring 26, that is, the cup. The drive shaft 19 rotates integrally.

Further, as shown in FIG. 6B, the outer ring 2
6. That is, when the cup-shaped drive shaft 19 rotates counterclockwise faster than the wrench output shaft 23, the wrench output shaft 23 rotates clockwise relative to the outer ring 26, and the roller 28 rotates the outer ring 26. The outer ring 26, that is, the cup-shaped drive shaft 19 idles with respect to the wrench output shaft 23 away from the cam surface 26a of the.

Further, an insertion hole 30 for inserting the speed reducer output shaft 17 from the base end portion to the middle portion of the wrench output shaft 23.
The outer circumference of the speed reducer output shaft 17 and the wrench output shaft 23.
A needle bearing 31 is interposed between the inner surfaces of the insertion holes 30 of the wrench so that the wrench output shaft 23 is rotatable around the speed reducer output shaft 17.

Then, a donut-shaped friction plate 32 for inserting the wrench output shaft 23 is fixed to the enlarged distal end portion 19b of the cup-shaped drive shaft 19 protruding from the hole 18a formed on the upper surface of the cover receiver 18, and the cup-shaped drive shaft is fixed. The friction plate 3 is integrally formed with the wrench output shaft 23 on the inner surface of the enlarged distal end portion of 19.
Two pressed parts 33 are provided.

The disc spring 34 inserted into the outer periphery of the intermediate portion of the wrench output shaft 23 and the pressing nut 35 cooperate with each other to form a pressing portion 36 for pressing the friction plate 32 against the pressed portion 33. When a certain load is applied to the speed reducer output shaft 17, that is, the cup-shaped drive shaft 19 by pressing the disc spring 34 with the pressing nut 35, the friction plate 32 idles between the pressed portion 33 and the pressing portion 36. And

The torque limiter 37 applies a constant load (load during tightening: 500 kgfc to the wrench output shaft 23.
m), the friction plate 32 slips, and the rotation is not transmitted from the cup-shaped drive shaft 19 to the wrench output shaft 23.

At this time, the wrench output shaft 23 stops and the cup-shaped drive shaft 19 rotates clockwise along with the friction plate 32 and the outer ring 26 of the one-way clutch 25, so that the one-way clutch 25 idles.

On the contrary, when the cup-shaped drive shaft 19 is rotated counterclockwise in the opposite direction (loosening direction), the one-way clutch 25 causes the roller 28 and the cam surface 2 on the inner surface of the outer ring 26 to rotate.
By the wedge action with 6a, the cup-shaped drive shaft 19 and the wrench output shaft 23 are integrated, and the loosening work can be performed regardless of the torque limiter 37.

Reference numeral 38 is a cover, which is the cup-shaped drive shaft 19
And the torque limiter 37 and the like, the lower end of the socket 24 of the wrench output shaft 23 is rotatably supported by a tip end through a bearing 39 and an oil seal 40, and the base end is covered by a cover receiver 18 of the bearing box 15. It is inserted in.

On the other hand, the outer periphery of the tip end portion of the insulating holder 4 is a polygonal portion 41 such as an octagon, and the outer periphery from the intermediate portion to the base end is a cylindrical portion 42 having a smaller diameter than the polygonal portion 41.

Circular flanges 43a and 43b are provided at the base end portion and the tip end portion, and a gripper gripping piece 43 made of polyacetal resin (POM) having an octagonal gripper gripping portion 43c in the middle is provided. It is inserted into the cylindrical portion 42 of the insulating holder 4 and fixed by a snap ring 44 so that it cannot be pulled out and is rotatable.

Further, an engaging claw 45 composed of eight concave claws obtained by dividing the flange 43b into eight equal parts is formed on the circular flange 43b at the tip of the gripper gripping piece 43.

Further, an angular positioning piece 46 made of polyacetal resin (POM) is slidably fitted into the polygonal portion 41 on the outer circumference of the tip of the insulating holder 4, and an angle positioning piece 46 is provided at the base end of the angle positioning piece 46. A claw 47 made of a quartered convex claw that fits into the concave claw is formed at a position facing the engaging claw 45 at the tip of the holding piece 43.

In using this, as shown in FIG. 5, the gripper gripping part 4 of the gripper gripping piece 43 is gripped by the gripper tool 48 of the power distribution work robot (manipulator).
Hold 3c.

Even if the work position direction for tightening and loosening bolts and nuts is different, the angle positioning piece 46 slides on the polygonal portion 41 on the outer circumference of the tip of the insulating holder 4 in the tip direction of the insulating holder 4. Let

Then, the engagement between the engaging claw 45 at the tip of the gripper gripping piece 43 and the claw 47 at the base end of the angle positioning piece 46 is released, and the gripper gripping piece 43 remains gripped by the gripper tool. Insulation holder 4 36 in 43
Rotation of 0 ° is possible.

Next, when the angle positioning piece 46 is slid at a proper position on the polygonal portion 41 on the outer periphery of the tip end of the insulating holder 4 in the base end direction of the insulating holder 4, the gripper gripping piece 43 is formed.
The engagement claw 45 at the tip end and the claw 47 at the base end of the angle positioning piece 46 engage with each other, and the rotation of the insulating holder 4 inside the gripper gripping piece 43 is prevented.

[0054]

Since the present invention has the above-described structure, the torque limiter 37 is provided in the tightening rotation direction.
The tip 19b of the cup-shaped drive shaft 19 and the wrench output shaft 2
Since it is provided between the three intermediate outer peripheral portions, a constant tightening torque is stably obtained, and the one-way clutch 25 is provided between the inner surface of the cup-shaped drive shaft 19 and the outer peripheral portion of the wrench output shaft 23 at the base end portion.
Since the hydraulic motor 1 is directly driven through the speed reducer 16 in the loosening rotation direction, the socket 24 into which the bolts and nuts are inserted can be rotated with a torque equal to or higher than the tightening torque. , One hydraulic wrench can be used to tighten and loosen bolts and nuts.

Compared with the conventional impact method, there is no impact and the hydraulic motor 1 is a rotary type, so there is no noise or vibration and the working environment can be improved.

Further, the angle positioning piece 46 is slid toward the tip of the insulating holder 4 so that the claw 4 of the angle positioning piece 46 is moved.
When the engagement between 7 and the engaging claw 45 at the tip of the gripper gripping piece 43 is released, the tip of the wrench body 49 rotates 360 ° with the gripper gripping piece 43 being gripped by the gripper tool 48 at the tip of the manipulator. Since it is free, conventionally, the complicated work of re-holding the wrench grip and repeating the re-approach to the bolt and nut of the work object is not necessary at all, and the power distribution work by the manipulator can be easily performed.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view showing an assembled state of a hydraulic wrench of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view of a main part as seen from the direction of arrow B in FIG.

FIG. 4 is a perspective view showing an assembled state of a gripper gripping piece and an angle positioning piece on an insulating holder.

5A and 5B show a state of adjusting the angle of the wrench, in which FIG. 5A shows a fixed state and FIG. 5B shows a adjusted state.

FIG. 6 shows an operating mechanism of a one-way clutch,
(A) is for operation (meshing), and (B) is for idling.

[Explanation of symbols]

 1 Hydraulic Motor 2 Coupler 3 Hydraulic Motor Output Shaft 4 Insulation Holder 5 Bulkhead 6 Hexagonal Socket Head Bolt 7 Insulation Joint 8 Insertion Hole 9 Transmission Device 10 Bevel Gear 11 Shaft 12 Shaft (Reducer Input Shaft) 13 Bearing 14 Snap Ring 15 Bearing Box 16 ring planetary gear reducer 17 reducer output shaft 18 cover receiver 18a hole 19 cup-shaped drive shaft 19a bottom surface 19b tip portion 20 bearing 21, 22 snap ring 23 wrench output shaft 24 socket 25 one-way clutch 26 outer ring 26a cam surface 27 retainer 28 rollers 29 metal spring 30 insertion hole 31 needle bearing 32 donut-shaped friction plate 33 pressed part 34 disc spring 35 pressing nut 36 pressing part 37 torque limiter 38 cover 39 bearing 40 oil seal 41 polygon Jo portion 42 cylindrical portion 43 the gripper gripping piece 43a, 43b circular flange 43c gripper gripper 44 snap ring 45 engagement claw 46 angular positioning piece 47 pawl 48 gripper tool 49 hydraulic wrench body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Sasaki 3-3-22 Nakanoshima, Kita-ku, Osaka City Kansai Electric Power Co., Inc. (72) Minoru Yamakawa 2-34-1 Honjo-Higashi, Kita-ku, Osaka Stock company Kindennai (72) Inventor Katsuya Yamamoto 2-33, Honjo East, Kita-ku, Osaka City Kindennai Stock company

Claims (3)

[Claims] 1. In a hydraulic wrench in which a socket such as a bolt and a nut is rotated by a hydraulic motor via a torque control mechanism, one shaft is connected to an output shaft of the hydraulic motor via a joint or an insulating joint. A pair of bevel gears and other two shafts are provided with a transmission that makes a right angle or at an angle, and when tightening and rotating, the reducer provided on the other shaft of the transmission rotates through a torque regulation mechanism. A wrench output shaft is attached, and a direct drive transmission mechanism that directly connects the output shaft of the hydraulic motor and the wrench output shaft when loosening is provided at the tip of the reduction gear output shaft and the base end of the wrench output shaft. A hydraulic wrench characterized by that. 2. A wrench output shaft is provided with an insertion hole for inserting the reduction gear output shaft from a base end portion to an intermediate portion, and the reduction gear output shaft is rotatably inserted into the insertion hole, and the wrench output shaft A cup-shaped drive shaft for inserting the base end is provided, and the base end of the bottom surface of the cup-shaped drive shaft is fixed to the output shaft base end of the reduction gear, and the base end between the cup-shaped drive shaft and the wrench output shaft is fixed. A one-way clutch is provided as a direct drive transmission mechanism,
The hydraulic wrench according to claim 1, wherein a torque limiter is provided as a torque restriction mechanism between the tip end portion of the cup-shaped drive shaft and the intermediate outer peripheral portion of the wrench output shaft. 3. A joint or an insulating joint interposed between the output shaft of the hydraulic motor and a set of bevel gears or the like is inserted into the distal end portion so that the hydraulic motor can be inserted and removed from the intermediate portion to the proximal end portion. An insulating holder to be fitted is provided, and a gripper gripping piece for rotatably inserting the base end portion from the middle part of the insulating holder is provided in the insulating holder in a non-removable manner, and an engaging claw is provided at the tip of the gripper gripping piece. An outer surface of the tip of the insulating holder is formed into a polygonal portion, a pawl that engages with the engaging pawl is formed at the base end of the insulating holder, and an angular positioning piece is provided to slidably insert the polygonal portion of the insulating holder. , The angle positioning piece is slid in the direction of the tip of the insulating holder to release the engagement between the claw of the angle positioning piece and the engaging claw of the tip of the gripper gripping piece, and the hydraulic wrench body can be freely rotated 360 ° together with the insulation holder. To let Claim 1 or claim 2 hydraulic wrench according to symptoms.