JP3536254B2 - Nut tightening device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a nut tightening device,
More specifically, it relates to a nut tightening device suitable for tightening a large diameter nut.

[0002]

2. Description of the Related Art With reference to FIG. 1, a planetary gear speed reducer, which is a typical example having a large-diameter nut that cannot be tightened with an ordinary spanner or wrench, will be described. A planetary gear reducer, generally designated by number 2, is used as a traveling reducer of a construction machine such as a hydraulic excavator, and has a motor housing 6 having a cylindrical portion in which a hydraulic motor 4 as a drive motor is incorporated, Rolling bearing 8 on its outer circumference
An outer housing 10 rotatably attached via
The planetary gear speed reducer 12 reduces the output rotation of the hydraulic motor 4 and connects it to the outer housing 10. A sprocket 16 around which traveling tracks (not shown) are wound is attached to the outer housing 10. The motor housing 6 is attached to the motor support 17.

The rolling bearing 8 of this planetary gear reducer 2
Is the inner ring 8 fitted to the outer peripheral portion of the motor housing 6.
a is tightened by a ring-shaped nut 14, is given a predetermined preload (preload), and is fixed. The nut 14 is screwed onto the male screw 6a on the outer peripheral portion of the motor housing 6 which is a nut mounting member.

The nut 14 is mounted before the planetary gear speed reducer 12 is assembled, with the rolling bearing 8 installed between the motor housing 6 and the outer housing 10 (two points in FIG. 2 described later). The state shown by the chain line). First, handle the nut 14 manually by hand.
Is screwed into the male screw 6a on the outer peripheral portion of the nut 14, and then a plurality of holes or cutouts provided on the circumference of the nut 14 are hit with metal fitting stays or the like to be struck in the circumferential direction using a hammer or the like, It is mounted by being rotated by a predetermined angle so as to obtain a tightened state.

A male spline 6b for mounting the planetary gear speed reducer 12 is formed on the outer peripheral portion of the open end of the motor housing 6. The hydraulic motor 4 is inserted and attached to the cylindrical portion of the motor housing 6 at the same time as or after the planetary gear speed reducer 12 is installed.

[0006]

The conventional tightening of the nut 14 having the above-mentioned configuration has the following problems to be solved.

(1) Obstruction of automation of assembly: In order to perform the tightening operation of the nut 14 on the conveyor of the assembly line, the nut 14 has a larger diameter than ordinary bolts, nuts, etc.
Large-scale chucking equipment is required for the conveyor to receive the reaction force against the tightening force. Further, when these equipments are installed, the assembly line is shut off, the flow between the processes is delayed, and it becomes a neck process of the work, which hinders automation of the assembly.

(2) Expensive capital investment: In order to eliminate the neck process of this work, the tightening process is moved outside the assembly line,
If the work is conveyed by a conveyor or the like directly connected to the assembly line to form a sub-dedicated tightening line, a large amount of capital investment will be required, which will increase the cost of the planetary gear reducer.

(3) Workability and quality: Since the nut 14 is tightened by rotating the nut 14 by hitting, the workability of tightening is poor. Moreover, it takes time to maintain a predetermined tightening quality.

The present invention has been made in view of the above facts, and its technical problem is to easily and reliably tighten a large-diameter nut without installing a reaction force receiving facility in an assembly line. It is to provide a nut tightening device capable of performing the above.

[0011]

According to a first aspect of the present invention, a reaction force receiving member is detachably mounted on a nut mounting member with which a nut is screwed, by locking relative rotation about an axis. Body, a swivel socket body rotatably attached to the reaction force receiving body about the axis, and the swivel socket body and the nut for relative rotation about the axis and relative movement in the axial direction. And engaging means for freely engaging with each other, and drive means for rotating the swing socket body with respect to the reaction force receiving body ,
The nut mounting member has a cylindrical portion and the
The engaging means includes a male screw with which a nut is screwed
Formed on the base and extending in the axial direction and arranged in the circumferential direction.
The screw holes that are provided and the swivel facing each of these screw holes
A plurality of members extending in the axial direction formed in the socket body in the circumferential direction.
Individually arranged locking holes and one end slides in each of these locking holes
It has a tip that is freely inserted and that is screwed into the screw hole at the other end.
And a plurality of stays for the nut tightening device.

Then, a reaction force receiving body having a swiveling socket body engaging with the nut is attached to a nut mounting member to which the nut is screwed, and the swiveling socket body is rotated by a driving means to receive a reaction force receiving body. Make it possible to tighten nuts easily and securely without installing equipment on the assembly line.

According to a second aspect of the present invention, in the nut tightening device according to the first aspect, the drive means includes a center hole type ratchet wrench attached to the reaction force receiving body, and the reaction force receiving device is provided. On the axis between the body and the swivel socket body, there is provided a prismatic member having a polygonal cross section, one end of which is rotatably attached to the reaction force receiving body and the other end of which is fixedly attached to the swivel socket body. The prismatic member is inserted into the ratchet hole of the wrench.

Then, the center socket type ratchet wrench is used to rotate the swing socket body to tighten the nut. By using the center hole type ratchet wrench, the driving means can be compactly provided between the reaction force receiving body and the swiveling socket body.

According to a third aspect of the present invention, in the nut tightening device according to the first aspect, the drive means includes a nut runner having a rotary output shaft arranged on the axis, and the reaction force receiving device is provided. The rotation output shaft is attached to the body, and the nut runner body is attached to the turning socket body.

Then, the swiveling socket body is swung using a nut runner to tighten the nut. By using a well-known nut runner that is frequently used in tightening work, the tightening device can be prepared at low cost.

According to a fourth aspect of the present invention, in the nut tightening device according to the first aspect, the drive means includes a nut runner having a rotation output shaft arranged on the axis, and the turning socket body is provided. The rotation output shaft and the nut runner body are attached to the reaction force receiving body.

Then, the swiveling socket body is swung using a nut runner to tighten the nut. By using a well-known nut runner that is frequently used in tightening work, the tightening device can be prepared at low cost. Further, by mounting the nut runner main body on the reaction force receiving body, the nut runner can be positioned at the portion where the mounted member has a cylindrical portion, and a more compact tightening device can be prepared.

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of a nut tightening device constructed according to the present invention will now be described in more detail with reference to the accompanying drawings. The nut is tightened in the planetary gear speed reducer 2 shown in FIG. 1 before the planetary gear speed reducer 12 is attached (indicated by a chain double-dashed line in FIG. 2 below).

A nut tightening device 20, which is a first embodiment of the nut tightening device, will be described with reference to FIGS.

Referring mainly to FIG. 2, the nut tightening device 20 has a motor housing 6 at the open end of a motor housing 6 having a cylindrical portion which is a nut mounting member.
A reaction force receiving body 22 which is detachably mounted by locking relative rotation about the axis line 7, and a swiveling socket body 24 which is rotatably attached to the reaction force receiving body 22 around the axis line 7. Engaging means 26 interposed between the swivel socket body 24 and the ring-shaped nut 14 and engaging with each other by locking relative rotation about the axis 7 and allowing relative movement in the extending direction of the axis 7 to be freely movable. And a hydraulically actuated center hole type ratchet wrench 28 attached to the reaction force receiving body 22 as a driving means for rotating the revolving socket body 24 with respect to the reaction force receiving body 22.

Explaining mainly with reference to FIG. 3 and FIG. 4 together with FIG. 2, the reaction force receiver 22 includes the motor housing 6
Disk-shaped reaction force receiving main body 30 that abuts the open end of the female spline 6a and the female spline 32a that fits into the male spline 6b at the open end.
And a cylindrical annular body 32 having. Ring 3
2 is a plurality of bolts 3 on the lower surface of the peripheral edge of the reaction force receiving body 30.
It is attached by 4. A boss 30c having a through hole 30a formed on the center axis 7 of the reaction force receiving body 30 and a bearing hole 30b having a larger diameter than the through hole 30a formed on the upper surface thereof.
Are provided respectively. On the outer edge side of the upper surface of the reaction force receiving main body 30, there is formed an annular protrusion 30d having an outer peripheral portion around the axis 7 for bearing mounting.

The swivel socket body 24 is located outside the reaction force receiving body 30 with respect to the opening end of the motor housing 6 in the direction in which the axis 7 extends, and the outer edge of the disk-shaped portion having a larger diameter than the reaction force receiving body 30. A socket head portion 36 in which a cylindrical portion extending downward is integrally formed, and a flanged cylindrical engaging means supporting portion 38 in which a collar portion is connected to a lower end of the cylindrical portion of the socket head portion 36. There is. The flange portion is attached to the socket head portion 36 by a plurality of bolts 39 arranged on the circumference.

A hexagonal hole 36a is formed on the axis 7 at the center of the disk-shaped portion of the socket head portion 36. Further, the disk-shaped portion and the cylindrical portion of the socket head portion 36 are formed with a plurality of access holes used for assembly and the like.

The engaging means supporting portion 38 is provided at a position facing the annular projection 30d of the reaction force receiving body 22 in the radial direction.
An annular recess 38a having an inner peripheral portion for bearing mounting is formed. At the lower end of the engaging means supporting portion 38, a plurality of engaging holes 27 constituting the engaging means 26 (the engaging means 26 will be described in detail later) are formed on the circumference and extend in the axis 7 direction. Is formed so that the cross section is elongated in the circumferential direction.

On the axis line 7 between the reaction force receiving body 22 and the swiveling socket body 24, a hexagonal prism 40, which is a prismatic member connecting them, is attached. The hexagonal column 40 has a through hole 40a having the same diameter as the through hole 30a of the reaction force receiving body 22 at its axial center.
Are formed. The upper end of the hexagonal prism 40 is inserted into the hexagonal hole 36a of the swiveling socket body 24, and the collar 40b provided on the hexagonal prism 40 is attached to the lower surface of the socket head 36 by a bolt 42.
It is attached and fixed by. The lower end of the hexagonal column 40 is formed in a columnar shape and is rotatably inserted into the bearing hole 30b of the reaction force receiving body 22.

The cylindrical guide 44 is used as the through hole 4 of the hexagonal prism 40.
0a and the through hole 30a of the reaction force receiving main body 30. The cylindrical guide 44 has a collar portion 4 formed at the lower end thereof.
4a is fixed to the lower surface of the reaction force receiving body 22 by a bolt 46, and an eye bolt 48 is attached to an upper end portion protruding upward from the turning socket body 24. An oil passage 44b is formed in the cylindrical guide 44, and the oil passage 44b extends from a pipe connection port 44c provided on the lower end surface of the cylindrical guide 44 to near the upper end, and is located on the outer peripheral surface above the swivel socket body 24. It is connected to a pipe connection port 44d opened at.

The rolling bearing 50 is mounted by the annular projection 30d of the reaction force receiving body 22 and the annular recess 38a of the turning socket body 24. The inner ring of the rolling bearing 50 has a bearing pressing flange 52 attached by bolts 53 to a plurality of screw holes provided on the circumference of the upper surface of the annular projection 30d, and the outer ring has a circular shape on the upper surface of the annular recess 38a. The bearing pressing flange 54 is provided in a plurality of screw holes provided on the circumference.
Are attached and supported by bolts 53, respectively. Thus, the swiveling socket body 24 is attached to the reaction force receiving body 22 via the rolling bearing 50 so as to be rotatable about the axis 7.

The engaging means 26 extends in the axial direction 7 formed in the nut 14 and is provided with a plurality of screw holes 14 arranged in the circumferential direction.
a, and the above-mentioned locking holes 27 which are formed in the engaging means supporting portion 38 of the turning socket body 24 so as to face each of the screw holes 14a, extend in the direction of the axis 7 and are arranged in the circumferential direction. One end is slidably inserted into each of the locking holes 27, and a plurality of stays 56 having a tip portion 56a screwed into the screw hole 14a are provided at the other end.

A center hole type ratchet wrench 28 as a driving means will be described with reference to FIGS. 5 and 6 together with FIGS. 2 and 4. The ratchet wrench 28 is
A single-acting hydraulic cylinder portion 58 and a ratchet portion 60 having a hexagonal hole 60a driven by the hydraulic cylinder portion 58 are provided.
The hydraulic cylinder portion 58 includes the reaction force receiving body 30 of the reaction force receiving body 22.
Fixed to the upper surface of the support member 62 by the piston 58a.
The output end of is connected to the engagement lever 60b of the ratchet portion 60. The piston 58a is biased toward the head side in the direction of contraction by the spring 58b. The aforementioned hexagonal column 40 is inserted into the hexagonal hole 60a of the ratchet portion 60, and is locked in the direction of the axis 7 by the spacer 61 and the C-shaped retaining ring 63.

When pressure oil is supplied to the head side of the hydraulic cylinder portion 58, the piston 58a compresses the spring 58b and operates in the extension direction, and the engagement lever 60b moves by that stroke to move the ratchet portion 60 along the axis 7. The hexagonal prism 40 fitted in the hexagonal hole 60a is rotated about the center, and is rotated,
The revolving socket body 24 connected to the hexagonal column 40 revolves accordingly. When the pressure oil on the head side of the piston 58a is released, the piston 58a returns to its original position by the biasing force of the spring 58b. At this time, the hexagonal prism 40 has the ratchet portion 6
It is held at the position rotated by 0. Therefore, by supplying and discharging the pressure oil to the head side of the hydraulic cylinder portion 58 and sequentially driving the piston 58a, the swiveling socket body 24 is swung in the direction indicated by the arrow T.

A hydraulic pipe for supplying / discharging pressure oil to / from the ratchet wrench 28 is connected to a hydraulic pressure control means (not shown) having a hydraulic pressure source and a switching operation valve. One end of the hydraulic pipe is the hydraulic cylinder portion 58 of the ratchet wrench 28.
Connected to the pipe connection port 58c of the cylinder guide 44 at the other end.
Hydraulic hose 66 connected to the L-shaped joint 64 attached to the pipe connection port 44c at the lower end of the column guide 44
And a hydraulic hose 68 having a pipe connection port 44d on the upper end side thereof connected to a hydraulic control means.

Referring to FIG. 7 together with FIG. 2 and FIG. 3, in order for the stylus type dial gauge 70 to detect the amount of movement of the inner ring 8a of the rolling bearing 8 in the direction of the axis 7 due to the tightening of the nut 14. The tip of the stylus is attached to the swiveling socket body 24 with the inner ring 8a abutting.

The tightening work of the nut 14 by the nut tightening device 20 configured as described above will be described mainly with reference to FIG.

(1) Standby for hoisting: A hoist hook (not shown) is hung on the eyebolt 48 to put the nut tightening device 20 in a hoisting and waiting state, and the outer housing 10 is mounted below the nut tightening device 20 via the rolling bearing 8. Then, the motor housing 6 to which the nut 14 is temporarily screwed is positioned.

(2) Installation of tightening device: The hoist is lowered to fit the nut tightening device 20 to the open end of the motor housing 6, and the male spline 6b at the open end to the female spline 32a of the reaction force receiving body 22. Place while putting together. In this process, the stay 56 of the locking means 26 is attached to the tip portion 5 of the stay 56.
6a is screwed into the screw hole 14a of the nut 14, and the other end is inserted into the locking hole 27 of the turning socket body 24.

(3) Tightening of nut: The hydraulic control means (not shown) is operated to supply the pressure oil to the ratchet wrench 28, and the swivel socket body 24 is swung so that the swivel socket body 24 has its lower end. The nut 14 is rotated by the stay 56 that is locked, and the rolling bearing 8 is tightened. As described above, supply and discharge of pressure oil to the ratchet wrench 28 is repeated to sequentially swivel the swiveling socket body 24 until the nut 14 is tightened to a predetermined level, that is, the amount of movement in the axis 7 direction.
Tighten while checking with dial gauge 70.

The operation and effect of the nut tightening device 20 according to the above-described first embodiment will be described.

(1) Reaction force reception: The nut tightening device 20
A reaction force receiving body 22 fixed to the motor housing 6 of the planetary gear reducer 2 with its rotation fixed, and a swiveling socket body rotatably mounted on the reaction force receiving body 22 and connected to the nut 14 via an engaging means 26. 24, and the nut 14 is rotated and tightened by a center hole type ratchet wrench 28 provided between the reaction force receiving body 22 and the turning socket body 24.
It is not necessary to install the reaction force receiving equipment required for tightening in the assembly line.

(2) Easy operation: The nut 14 is tightened by the nut tightening device 2 lifted by the hoist hook.
By positioning the planetary gear reducer 2 carried on the conveyor under 0, it can be carried out easily and reliably and on the conveyor. Further, the size of the nut tightening device 20 in the radial direction is determined by the size of the nut 1 to be tightened.
It is almost the same as 4 and is easy to handle.

(3) Compact: Nut tightening device 20
Since the reaction force receiving body 22 and the ratchet wrench 28 are built in the turning socket body 24, the tightening device can be made compact and compact.

(4) Hydraulic piping: Further, piping such as a hydraulic hose connected to the ratchet wrench 28 is connected to the cylindrical guide 44 having an oil passage fixed to the reaction force receiver 22 and the ratchet wrench 28. Therefore, the turning of the turning socket body 24 does not wind up or interfere with the hydraulic pipe. Also, the hydraulic piping is simplified.

(5) Quality improvement: The tightening work of the nut 14 is easy, and the tightened state can be easily controlled at the same time as the tightening by the dial gauge 70. Can be done.

A nut tightening device 80, which is a second embodiment of the nut tightening device, will be described with reference to FIGS. 8 and 9. 8 and 9, parts that are substantially the same as those in FIGS. 1 to 4 are denoted by the same reference numerals.

The nut tightening device 80 is substantially the same as the above-described nut tightening device 20 (first embodiment) except that the driving means and its mounting structure are different. Therefore, in principle, the description of the same part will be omitted to avoid duplication.

The nut tightening device 80 is detachably mounted by locking relative rotation about the axis 7 of the motor housing 6 at the open end of the motor housing 6 which is a nut mounting member with which the nut is screwed. A reaction force receiving body 82, a swiveling socket body 84 rotatably attached to the reaction force receiving body 82 about the axis line 7, and a swiveling socket body 84 interposed between the swiveling socket body 84 and the nut 14 centered on the axis line 7. The engaging means 26 engaged with the relative rotation in the direction of extension of the axis 7 by locking the relative rotation of the engaging means 26 and the rotating socket body 84 as a drive means for rotating the reaction force receiving body 82. The rotary output shaft is provided with a vertical electric nut runner 86 arranged on the axis 7. In the nut runner 86, the rotation output shaft 88 is attached to the reaction force receiving body 82, and the nut runner main body 90 is attached to the turning socket body 84.

The reaction force receiving body 82 has a cylindrical shape having a disc-shaped reaction force receiving body 92 that abuts the opening end of the motor housing 6 and a female spline 32a that fits into the male spline 6b at the opening end. And an annular body 32. In the reaction force receiving body 82, the reaction force receiving body 92 has the nut tightening device 2 described above.
0 (first embodiment) is the same except that the shape of the reaction force receiving body 30 of the reaction force receiving body 22 and the portion of the axis line 7 are different. A boss 92a is projectingly provided on the axis line 7 on the upper surface of the reaction force receiving main body 92, and a through hole 92b having a square hole is formed. A rectangular rod-shaped rotation output shaft 88 of the nut runner 86 is inserted into the through hole 92b.

The swivel socket body 84 is located outside the reaction force receiving main body 92 with respect to the opening end of the motor housing 6 in the direction of the axis 7, and is a disk-shaped socket head having a larger diameter than the reaction force receiving main body 92. It has a portion 94 and a flanged cylindrical engagement means support portion 38 attached by a plurality of bolts 39 on the lower side of the outer edge portion of the socket head portion 94. The engaging means supporting portion 38 is the same as that in the nut tightening device 20 (first embodiment) described above. On the upper surface of the socket head portion 94, a suspender 96 having two upright columns is provided, and the eyebolt 48 is attached to the tip thereof. At the center of the upper surface of the disk-shaped portion of the socket head portion 94, a rectangular recess 94b having a through hole 94a on the axis 7 for mounting the rectangular mounting flange 90a of the nut runner body 90 is formed. . A screw hole 94c is formed on the outer side of each side of the recess 94b.

The rolling bearing 50 and its mounting structure for mounting the revolving socket body 84 on the reaction force receiving body 82 so as to be rotatable about the axis 7 are the same as those in the nut tightening device 20 (first embodiment). It is the same.

The engaging means 26 for engaging the turning socket body 84 and the nut 14 is the same as that in the nut tightening device 20 (first embodiment) described above.

In the nut runner 86, the rectangular mounting flange 90a of the nut runner main body 90 is the socket head 94.
The rotation output shaft 88, which is fitted into a rectangular recess 94b on the upper surface of the above, and protrudes, is inserted and attached to the square hole 92b of the reaction force receiving body 82. The mounting flange 90a has a recess 94b.
It is detachably attached by a latch screw 98 attached to a screw hole 94c around the. That is, the latch screw 98 has the cutout portion 98a and has the mounting flange 9
It is equipped with a cylindrical part that 0a holds and a handle 98b,
The nut runner 86 can be easily attached and detached by rotating the handle 98b while releasing the pressing of the mounting flange 90a by the notch 98a. The nut runner 86 is connected by an electric wire 100 to a power supply device (not shown) including an intermittent switch.

Thus, when the power of the nut runner 86 is turned on, the rotation output shaft 88 is fixed to the reaction force receiving body 82, so that the nut runner main body 90 is rotated,
The swiveling socket body 84 to which the nut runner main body 90 is attached is swung.

The nut runner 86 has a built-in cutoff type torque detection device. This torque detection device detects the tightening torque and, when a predetermined tightening torque is detected, operates the limit switch to cut off the power supply. That is, when the tightening torque of the nut runner compresses the spring of the detector (not shown), the limit dog that moves in conjunction with this moves the limit switch 102 to activate the nut runner 86.
Stop the rotation of the motor.

Nut fastening device 8 constructed as described above
The work of tightening the nut 14 with 0 will be described.

(1) Standby for lifting, installation of tightening device:
The lifting and standby of the nut fastening device 80 is the same as in the case of the nut fastening device 20 described above. That is,
A nut tightening device 80, in which a hoist hook (not shown) is hung on the eyebolt 48 to make it stand by, is operated to lower the hoist to move the hoist down to the open end of the motor housing 6.
The reaction force receiving body 92 of the reaction force receiving body 82 is placed while fitting the female spline 32a of the annular body 32 to the male spline 6a at the open end. In this process, the tip portion of the stay 56 is screwed into the nut 14, and the other end is inserted into the locking hole 27 of the turning socket body 84.

(2) Tightening of nut: A power supply device (not shown) is operated to turn on the power, and the nut runner 86 is operated to attach the nut runner main body 90 to the reaction force receiver 82 whose rotation is fixed. Rotate and swivel socket body 84
Is rotated, the nut 14 is rotated by the stay 27 that is inserted into the lower end of the swiveling socket body 84, and the rolling bearing 8 is tightened. When the tightening torque reaches the specified value, it is detected by the torque detection device of the nut runner 86, the power is turned off, and the rotation of the motor of the nut runner 86 is stopped.

The operation and effect of the nut tightening device 80 according to the second embodiment described above will be described.

(1) Reaction force reception: the above-mentioned nut tightening device 2
0 (first embodiment), the motor housing 6
The reaction force receiving body 82 fixedly mounted on the rotation direction, and the engaging means 2 attached to the nut 14 rotatably mounted on the reaction force receiving body 82.
It is necessary to tighten the nut 14 because the nut runner 86 provided between the reaction force receiver 82 and the turning socket body 84 is used to tighten the nut It is not necessary to install a large reaction force receiving equipment on the assembly line.

(2) Ease of work: The nut tightening work is performed by the nut tightening device 80 lifted by the hoist hook in the same manner as the nut tightening device 20 (first embodiment) described above. By placing it on the planetary gear reducer 2 that has been conveyed below it on the conveyor, it can be carried out easily and reliably and on the conveyor. Further, the size of the nut tightening device is substantially the same as the diameter of the nut, and the handling is easy.

(3) Removable nut runner: The nut runner 86 can be easily attached to and detached from the turning socket body 84 by rotating the handle 98b of the latch screw 98. Therefore, it is possible to easily replace the nut runners having different tightening torque setting values according to demands. When the required tightening torque is constant, the mounting flange 90a of the nut runner 86 may be directly fixed to the swivel socket body 84 with a bolt or the like.
Further, for example, when the planetary gear reducer is small and the nut runner is relatively small, the nut runner is not fixed and the main body is fitted into the swivel socket body 84 at the time of tightening work and the rotation output thereof is provided. It is also possible to insert the shaft 88 into the reaction force receiver 82.

(4) Quality improvement: Since the tightening operation of the nut 14 is easy, and the tightening state is simultaneously detected by the torque detecting device, the tightening state can be easily managed.
Tightening work with reliable quality can be easily performed in a short time.

A nut tightening device 110, which is a third embodiment of the nut tightening device, will be described with reference to FIG. Note that, in FIG. 10, portions that are substantially the same as those in FIGS. 1 to 4 are denoted by the same reference numerals.

The nut tightening device 110 is substantially the same as the above-described nut tightening device 20 (first embodiment) except that the driving means and its mounting structure are different. Therefore, in principle, the description of the same part will be omitted to avoid duplication.

The nut tightening device 110 is removably attached to the opening end of the motor housing 6 which is a nut mounting member into which the nut is screwed, by the relative rotation of the motor housing 6 around the axis 7 being locked. The reaction force receiving body 112, the swiveling socket body 114 rotatably attached to the reaction force receiving body 112 about the axis line 7, and the swiveling socket body 114 interposed between the swiveling socket body 114 and the nut 14, centering around the axis line 7. Rotation output as engaging means 26 that locks relative rotation and engages by freely allowing relative movement in the extending direction of the axis 7 and drive means for rotating the swiveling socket body 114 with respect to the reaction force receiving body 112. The shaft is provided with a vertical electric nut runner 116 arranged on the axis 7. The nut runner 116
The rotation output shaft 118 is attached to the swivel socket body 114, and the nut runner body 120 is attached to the reaction force receiver 112. Therefore, the nut runner 116 is positioned in the cylindrical portion of the motor housing 6 in which the hydraulic motor 4 is built.

The reaction force receiving body 112 is a cylindrical ring having a disc-shaped reaction force receiving body 122 that abuts the opening end of the motor housing 6 and a female spline 32a that fits into the male spline 6b at the opening end. And a body 32. In this reaction force receiving body 112, the reaction force receiving body 122 has a shape of the portion of the axis 7 and the reaction force receiving body 30 of the reaction force receiving body 22 in the nut tightening device 20 (first embodiment) described above. Are the same except that they are different. A through hole 122 a for mounting the nut runner body 120 is formed on the center axis 7 of the reaction force receiving body 122.

The swivel socket body 114 is substantially the same as the swivel socket body 24 (first embodiment) described above except that the hexagonal hole 36a on the axis 7 is formed as a round through hole 114a. .

The rolling bearing 50 for mounting the swiveling socket body 114 on the reaction force receiving body 112 so as to be rotatable about the axis 7 and its mounting structure are the same as those in the nut tightening device 20 (first embodiment). It is the same.

The engaging means 26 for engaging the turning socket body 114 and the nut 14 is the nut tightening device 20 described above.
It is the same as that in the (first embodiment).

In the nut runner 116, the positioning boss 120a of the nut runner main body 120 is fitted into the through hole 122a of the reaction force receiving body 112, and the mounting flange 120b is attached to the lower surface of the reaction force receiving body 112 by bolts.
The rotary output shaft 118 protruding upward is provided with a quadrangular rod-shaped portion at the tip thereof, and the quadrilateral rod-shaped portion is formed through the through hole 1 of the swiveling socket body 114.
14a and is inserted into the square hole 124a of the boss socket 124 attached by a bolt. An eyebolt 48 is attached to the upper end surface of the boss socket 124.

In the space surrounded by the reaction force receiving body 112 and the swiveling socket body 114, the cylindrical drum 12 with the axis 7 as the center.
6 is attached to the reaction force receiver 112. The electric wiring 128 of the nut runner 116 passes through the wiring hole 122b of the reaction force receiving main body 122, is wound around the drum 126, and is stored.
External wiring 1 through the wiring hole 114b of the turning socket body 114
A power supply device (not shown) including an intermittent switch is connected by 30.

The nut runner 110 has a built-in cutoff type torque detecting device which is substantially the same as that of the nut runner 86 (second embodiment). With a torque detector (not shown),
The tightening torque is detected, and when a predetermined torque is detected, the limit switch 132 shuts off the power and the rotation of the motor of the nut runner 116 is stopped.

Nut tightening device 1 configured as described above
The tightening work of the nut 14 by the 10 is performed in the same manner as the above-described nut tightening device 80 including the nut runner (second embodiment).

The operation and effect of the nut tightening device 110 according to the above-described third embodiment will be described.

(1) Reaction force receiving: Similar to the nut tightening device 80 (second embodiment), the reaction force receiving body 11 fixed to the motor housing 6 of the planetary gear reducer 2 is fixed in rotation.
2 and a nut 1 rotatably attached to the reaction force receiver 112.
Swivel socket body 11 connected to the No. 4 via engaging means 26
4 and a nut runner 116 provided between the reaction force receiving body 112 and the swiveling socket body 114.
4 is tightened, it is not necessary to install the reaction force receiving equipment required for tightening the nut 14 in the assembly line.

(2) Ease of work: The nut tightening work is similar to the tightening work in the nut tightening device 80 (second embodiment), and the nut tightening device 110 lifted by the hoist hook is used to convey the nut. By mounting it on the planetary gear reducer 2 that has been carried over, it can be carried out easily and reliably and on the conveyor. Further, the size of the nut tightening device 110 is substantially the same as the diameter of the nut 14, and the handling is easy. In addition, Nutrunner 1
Since 16 is positioned in the cylindrical portion of the motor housing 6 without protruding upward unlike the nut runner 86 in the nut tightening device 80 (second embodiment), it does not interfere with the tightening work.

(3) Electric wiring: Nut runner main body 12
No. 0 is attached to the reaction force receiving body 112 and its rotation is fixed, and its electric wiring is housed in the drum 126 attached to this reaction force receiving body 112, so that the electric wiring is in the nut tightening device 110. Therefore, it does not wind around the swiveling socket body 114. Further, in the tightening work, the swivel socket body 114
Since the number of rotations is substantially small, the external wiring 130 does not wind around the turning socket body 114.

(4) Quality improvement: The tightening operation of the nut 14 is easy, and the tightening state is simultaneously detected by the torque detecting device, so that the tightening state can be easily managed.
Fast and reliable tightening work can be performed easily in a short time.

Here, referring to FIGS. 11 and 12, the engaging means 14 which is another embodiment of the engaging means 26 described above.
0 will be described. The engaging means 140 includes a nut 142.
And a hexagonal prism-shaped outer peripheral portion 142a formed on the revolving socket body 144, and a hexagonal rectangular hole portion 144a fitted into the outer peripheral portion 142a. The outer peripheral portion 142a of the nut 142 and the square hole portion 144a of the swivel socket body 144 lock the relative rotation of the swivel socket body 144 and the nut 142 to allow relative movement in the axis 7 direction.

13 and 1 together with FIGS. 11 and 12.
Referring to FIG. 4, a reaction force receiving body 150 which is another embodiment of the reaction force receiving body 22 will be described. Reaction force receiver 150
Is provided with a square column portion 150a that fits into a square hole 152a formed on the axis 7 of the shaft 152 that is a nut mounting member. And the square hole 1 of the shaft 152
The reaction force receiver 150 is detachably mounted on the shaft 152 by locking relative rotation with the shaft 50 and the prismatic portion 150a of the reaction force receiver 150. 11 and 12 show a hexagonal shape of the square hole 152a and the prismatic portion 150a, and FIGS. 13 and 14 show a square shape of the square hole 152a and the prismatic portion 150a.

A reaction force receiver 160 which is still another embodiment of the reaction force receiver will be described with reference to FIGS. The reaction force receiver 160 is a hexagonal prism 162 formed at an end of the shaft 162, which is a nut mounting member, on the axis line 7.
It has a hexagonal square hole portion 160a that fits into a. Then, the reaction force receiver 160 is attached to the shaft 1 by the prism 162a of the shaft 162 and the square hole portion 160a of the reaction force receiver 160.
The relative rotation is locked to 62 and it is detachably attached.

With reference to FIGS. 17 and 18, a reaction force receiving body 170 which is still another embodiment of the reaction force receiving body will be described. The reaction force receiving body 170 includes a plurality of pins 170a that are fitted into a plurality of (two in the illustrated case) pin holes 172a formed around the axis 7 at the end of the shaft 172 that is a nut mounting member. ing. Then, the reaction force receiving body 170 is detachably attached to the shaft 172 by the relative rotation being locked by the pin hole 172a of the shaft 172 and the pin 170a of the reaction force receiving body 170.

Although the present invention has been described in detail above based on the embodiments, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the present invention, for example, as described below. It can be transformed or modified.

(1) Reaction force receiver: In the present embodiment, a spline reaction force receiver 2 is used as a reaction force receiver that is detachably mounted by locking relative rotation to the nut mounting member.
2, the reaction force receivers 150 and 160 by the square hole and the prism, and the reaction force receiver 170 by the pin and the pin hole are shown, but the means for attaching the reaction force receiver to the nut mounting member locks the relative rotation. Therefore, any suitable means such as a groove extending in the radial direction and a ridge fitted to the groove can be used.

(2) Engaging means: In the present embodiment, the male splines 6b of the motor housing 6, which is a nut mounting member, are fitted to the female splines 32a of the reaction force receiving bodies 22, 82, 112, and rotate relative to each other. I tried to stop
As shown in FIG. 19, when the motor housing 180, which is a nut mounting member, includes a female spline 180a,
Male spline 182a fitted to reaction force receiver 182
Should be provided.

(3) Engaging Means: In this embodiment, the engaging means 26 is the screw hole 1 formed in the nut 14.
4a, a locking hole 27 formed in the engaging means supporting portion 38 of the turning socket body 24, and a stay 56 in which one end is slidably inserted into the locking hole 27 and the other end is screwed into the screw hole 14a.
And the engagement means 140 (FIG. 11) includes a nut 142
The hexagonal prism-shaped outer peripheral portion 142a formed on the outer peripheral portion 142a and the hexagonal rectangular hole portion 144a formed on the revolving socket body 144 and fitted into the outer peripheral portion 142a are provided.
It is not limited to these forms as long as it is interposed between the swivel socket body and the nut so as to lock the relative rotation about each axis and freely engage the relative movement in the extending direction of the axis. Not something.

(4) Driving means: Center hole type ratchet wrench 2 as the driving means in the present embodiment
Although 8 is a hydraulic type and the nut runners 86 and 116 are an electric type, the drive system is not limited to them, and may be changed according to available facilities such as electricity, hydraulic pressure, and pneumatic pressure.

(5) Torque detecting device: In the present embodiment, the nut tightening device 80 is used to detect the tightened state.
(Second embodiment) and nut tightening device 110 (third embodiment)
In the above embodiment), the torque detection device is incorporated in the nut runner, but instead of this, the nut tightening device 2 is used.
The dial gauge 70 used in No. 0 (first embodiment) may be used.

[0100]

According to the nut tightening device constructed according to the present invention, a nut having a relatively large diameter can be tightened easily and surely without installing a reaction force receiving facility on the assembly line. Provided is a nut tightening device.

And, without complicating the assembly work,
Since the specified tightening torque can be controlled, the work is reliable in terms of quality. Further, there is an effect that the quality control record of each assembled component can be obtained by performing various electric controls. Further, since the reaction force is received by utilizing the spline of the nut mounting member, the structure is very simple, and the swivel socket of the nut tightening device is small, so that the handling is not complicated. Therefore, there is an advantage that the cost of the product can be reduced by being able to deal with the situation without modifying the existing assembly / transportation conveyor line.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a traveling speed reducer that is a typical example of a planetary gear speed reducer in which a nut tightening device according to the present invention is used.

FIG. 2 is a sectional view showing a first embodiment of a nut tightening device configured according to the present invention.

FIG. 3 is a perspective view of the nut tightening device shown in FIG.

FIG. 4 is a perspective view showing the nut tightening device shown in FIG. 2 in an exploded state.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a detailed cross-sectional view of a portion of the center hole type ratchet wrench shown in FIG.

FIG. 7 is a cross-sectional view showing a mounted state of the dial gauge shown in FIG.

FIG. 8 is a cross-sectional view showing a second embodiment of a nut tightening device configured according to the present invention.

9 is a cross-sectional view taken along the line BB of FIG.

FIG. 10 is a sectional view showing a third embodiment of the nut tightening device configured according to the present invention.

FIG. 11 is a cross-sectional view showing another embodiment of the engaging means and the reaction force receiving body.

FIG. 12 is a diagram viewed in the direction of arrows CC in FIG.

FIG. 13 is a sectional view showing another embodiment of the reaction force receiver.

FIG. 14 is a diagram viewed in the direction of arrows D-D in FIG. 13.

FIG. 15 is a sectional view showing still another embodiment of the reaction force receiver.

16 is a diagram viewed in the direction of arrow EE in FIG.

FIG. 17 is a sectional view showing still another embodiment of the reaction force receiver.

FIG. 18 is a view as seen in the direction of arrow F-F in FIG. 17.

FIG. 19 is a sectional view showing another embodiment of the engaging means.

[Explanation of symbols]

2: Planetary gear reducer 4: Hydraulic motor 6: Motor housing (nut mounting member) 6b: Male spline (spline) 7: Axis 8: Rolling bearing 10: Outer housing 12: Planetary gear reducer 14: Nut 14a: Screw hole 20: Nut tightening device 22: Reaction force receiving body 24: Revolving socket body 26: Engaging means 27: Locking hole 28: Center hole type ratchet wrench (driving means) 32a: Female spline (spline) 40: Hexagonal column (Square pillar member) 56: Stay 60a: Ratchet hole 70: Dial gauge 80: Nut tightening device 82: Reaction force receiver 84: Swivel socket body 86: Nut runner (driving means) 88: Rotation output shaft 90: Nut runner main body 102: Limit switch 110: Nut tightening device 112: Reaction force receiver 114: Revolving socket body 116: Nutra (Rotating means) 118: rotation output shaft 120: nut runner main body 132: limit switch 140: engaging means 142: nut 142a: outer peripheral portion 144: turning socket body 144a: square hole portion 150: reaction force receiving body 150a: prismatic Part 152: Shaft (nut mounting member) 152a: Square hole 160: Reaction force receiving body 160a: Square hole part 162: Shaft (nut mounting member) 162a: Square column 170: Reaction force receiving body 170a: Pin 172: Shaft (nut mounting) Member) 172a: pin hole 180: motor housing (nut mounting member) 180a: spline 182: reaction force receiver 182a: spline

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuto Iwamoto 4-10-1 Yoga, Setagaya-ku, Tokyo Inside New Caterpillar Mitsubishi Corp. (72) Inventor Yoshiya Fukuya 4--10-1, Yoga, Setagaya-ku, Tokyo Within New Caterpillar Mitsubishi Corp. (56) References Actually open 61-81876 (JP, U) Actually open 59-74063 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B25B 21/00 B25B 21/00 540 B25B 23/05 B25B 23/14 620 F16B 37/04

Claims (4)

(57) [Claims] 1. A reaction force receiver that is detachably mounted by locking relative rotation about an axis on a nut mounting member to which a nut is screwed, and a center of the reaction force receiver on the axis. A rotatably mounted swivel socket body, an engagement means for locking the swivel socket body and the nut with respect to relative rotation about the axis line and allowing relative movement in the axial direction, and the swivel socket. A driving means for rotating the body with respect to the reaction force receiving body , wherein the nut mounting member has a cylindrical portion,
The nut includes a male screw to be screwed, and the engaging means extends in the axial direction formed in the nut.
Multiple screw holes arranged in the circumferential direction, and each of these screw holes.
The axial direction formed in the turning socket body facing each other
A plurality of locking holes extending in the circumferential direction and the locking holes
One end is slidably inserted into each of the
And a plurality of stays each having a tip portion to be screwed , the nut tightening device. 2. The drive means includes a center hole type ratchet wrench attached to the reaction force receiving body, and one end of the reaction force is on the axis between the reaction force receiving body and the swiveling socket body. 2. The prismatic member having a polygonal cross section, the other end of which is rotatably fixed to and attached to the swivel socket body, is provided on the receiving body, and the prismatic member is inserted into the ratchet hole of the ratchet wrench. Nut tightening device. 3. The driving means includes a nut runner having a rotation output shaft arranged on the axis, and the rotation output shaft is attached to the reaction force receiving body and the nut runner body is attached to the turning socket body. The nut tightening device according to claim 1, which is provided. 4. The drive means includes a nut runner having a rotation output shaft arranged on the axis, and the rotation output shaft is attached to the revolving socket body, and the nut runner body is attached to the reaction force receiver. The nut tightening device according to claim 1, which is provided.