JP2001038547A - Variable mechanism of clearance between tools - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily vary a clearance between tools when a work type is changed, to reduce a cost, to make maintenance easy and to decrease an occupying space. SOLUTION: A pair of bushes 34a and 34b are rotatably situated at a support member 30 and the sockets 62a and 62b of a socket runner are situated at the respective bushes 34a and 34b. The rotation center A2 of the sockets 62a and 62b is set to a position spaced away by 2 mm from the rotation center A1 of the bushes 34a and 34b. Thereby, when the bushes 34a and 34b are rotated in a 60 deg. arc, the rotation center A2 of the sockets 62a and 62b is rotated and a clearance between the sockets 62a and 62b is varied by 4 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool spacing variable mechanism for changing the spacing between a plurality of tools in accordance with a workpiece.

[0002]

2. Description of the Related Art Conventionally, nut runners have been used for fastening or loosening nuts to bolts. For example, this kind of nut runner is used when assembling or removing a connecting rod and a connecting rod cap of an engine. FIG. 8 shows a device incorporating the nut runner and removing the connecting rod cap from the connecting rod (hereinafter referred to as a disassembling device).

In this disassembly apparatus 1, two pairs of nut runners 2a, 2b and 3a, 3b are provided on a base 4 in parallel with each other, and the distance between the tips of the nut runners 2a and 2b is set to the connecting rod 6 of the piston 5. Screws 7a and 7 fastened
b is set to coincide with the distance from the nut runner 3
The distance between a and 3b is set so as to match the distance between screws 9a and 9b fastened to connecting rods 8 of different models. That is, if the model is different like the connecting rods 6 and 8, the distance between the nut runners 2a and 2b and the nut runner 3
A structure in which the distance between a and 3b must be different.

[0004]

Therefore, in the above-described prior art, it is necessary to prepare a pair of nut runners 2a, 2b, 3a, 3b corresponding to the number of types of workpieces. The cost rises as a whole, and it is said that securing of a space for waiting this kind of disassembly apparatus 1 and maintenance of the disassembly apparatus 1 are complicated, and the disassembly apparatus 1 to be used must be replaced according to the work. There is also a problem in the process. In addition, every time the connecting rod model is changed, the operator needs to change the nut runners 2a and 2b and the nut runners 3a and 3b.
It was necessary to select and arrange one of them.

In this regard, Japanese Patent Application Laid-Open No. H10-230425
According to the publication, a pair of Y-axis direction nut runner holding plates are provided so as to be displaceable in the Y-axis direction with respect to the unit base, and each of the Y-axis direction nut runner holding plates is provided with a pair of X-axis direction nut runner holding plates. There is proposed an inter-axle pitch varying device for a multi-shaft nut runner which sets the gap between the nut runner shafts by positioning the nut runner holding plate for the Y-axis direction and the nut runner holding plate for the X-axis direction with a stopper block. .

However, this apparatus requires a cylinder and a guide member to displace the nut runner holding plate for the Y-axis direction and the nut runner holding plate for the X-axis direction.
There is a problem that the structure of the apparatus is complicated and the cost rises, and the maintenance work increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can easily change the tool interval when the type of workpiece is changed, including the type of connecting rod, thereby reducing the cost. It is an object of the present invention to provide a mechanism capable of reducing the cost, facilitating maintenance, and occupying a small space, and varying the interval between tools.

[0008]

In order to achieve the above-mentioned object, the present invention provides a base, a support member erected on the base, and a pair of bushes rotatably provided on the support member. And a pair of tools provided on the pair of bushes, respectively, and a pair of rotation driving sources provided on the base in parallel with each other and rotating the pair of tools, the rotation center of the tool being the bush. It is characterized in that it is arranged at a position different from the rotation center of.

According to the present invention, when the bush is rotated, the position of the center of rotation of the tool is deviated, so that the interval between the pair of tools can be changed.

In this case, when the rotary drive source is fixed to the base and the rotary motion of the rotary drive source is transmitted to the tool via a universal joint, only the tool is displaced by the bush and the interval therebetween is reduced. This is preferable because it can be changed, and there is no need to deviate the rotary drive source, and the variable interval mechanism can be made compact.

It is preferable that the bush be provided with a stopper for positioning the rotational position of the bush relative to the support member, so that the interval between the tools can be accurately determined.

Still further, the variable distance mechanism is incorporated in a disassembling device for removing a connecting rod cap from a connecting rod, and the tool is disassembled when the tool is a nut runner for removing a pair of nuts for mounting the connecting rod cap to the connecting rod. When the model of the connecting rod is changed, the distance between the tools is changed by the variable distance mechanism in accordance with the distance between the pair of nuts, so that the connecting rod cap can be removed from the connecting rods of a plurality of types with this disassembling apparatus. Become.

Still further, a displacement member is provided on the base for moving the connecting rod and the connecting rod cap toward and away from the tool, and the displacement member is formed by a hole formed by the connecting rod and the connecting rod cap. And a guide member abutting on the outside of the connecting rod and the connecting rod cap, the connecting rod and the connecting rod cap are positioned on the displacement member to approach the nut runner, thereby assembling the connecting rod cap to the connecting rod. It is more preferable that the nut can be accurately engaged with the nut runner.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a variable tool spacing mechanism according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and FIG.
1 shows a disassembling apparatus in which the tool interval variable mechanism 12 according to the present embodiment is used.

The disassembly apparatus 10 has a long base 14. A mounting member 18 having support plates 16a and 16b parallel to each other is fixed to the base 14, and each of the support plates 16a and 16b is fixed.
Rods 20a and 20b are bridged between a and 16b. A pair of nut runners 22 are provided on the support plates 16a and 16b.
a, an air motor 24 serving as a rotary drive source constituting 22b
a and 24b are arranged in parallel with each other. Air motor 24
Ports 26a and 26b are provided at one end of the ports a and 24b, and a compressed air supply source (not shown) is connected to the ports 26a and 26b.

The base 14 is provided with a variable interval mechanism 12. The variable interval mechanism 12 has a support member 30 having a substantially L-shaped cross section, and a cover member 28 having a substantially U-shaped cross section is provided from the support member 30 to the support plate 16a. Bushings 34a and 34b are provided on the support member 30 so as to be rotatable about a rotation center A1 (see FIG. 4). Bush 34a,
34b has convex portions 36a and 36b whose tip portions are arc-shaped,
The protrusions 36a and 36b have stoppers 38a and
38b is provided. The stoppers 38a and 38b are shown in FIG.
As shown in the figure, the cylindrical member 41 has a cylindrical member 41 that is screwed into a screw hole 40 formed in the bush 34a, 34b.
The rod portion 42 is inserted through. A grip portion 44 is provided at one end of the rod portion 42, while a fitting portion 46 is provided at the other end. The fitting portion 46 is a coil spring 4
8 urges the support member 30. The fitting portion 46 fits into one of the holes 50a to 50d formed in the support member 30 when the bushings 34a and 34b rotate to a predetermined position.

The bushings 34a and 34b are provided with holes 52a and 52b along the axial direction thereof.
Composite bearings 54a and 54b are mounted on a and 52b. Each of the composite bearings 54a and 54b has a plurality of ball bearings 56 for supporting a force applied in the axial direction and a plurality of roller bearings 58 for supporting a force applied in a direction perpendicular to the axis. The composite bearings 54a, 54b are provided with sockets 62a, 62b. Socket 62
Each of a and 62b is formed in a substantially cylindrical shape, and a concave portion 64 is formed at one end side along the axial direction. The inner periphery of the wall forming the recess 64 is formed in a spline shape so that the nut is engaged (see FIG. 4).

The position of the rotation center A2 of the sockets 62a, 62b is arranged at a predetermined distance, preferably 2 mm, from the rotation center A1 of the bushings 34a, 34b. in this case,
When the bushings 34a and 34b are manually rotated to position the bushings 34a and 34b at positions where the fitting portions 46 of the stoppers 38a and 38b are fitted into the holes 50a to 50d, the rotation center A1 and the rotation center A2 are set. Is a straight line connecting the base 1
4 is set to be at an angle of 60 ° with respect to the plane No. 4 (see FIG. 4). The rotation center A3 of the air motors 24a and 24b is set at a position where the fitting portions 46 of the stoppers 38a and 38b are fitted into the holes 50a and 50d.
4b and the fitting portion 46
At the position where the bushing 34 is fitted into the holes 50b and 50c.
a, 34b are located at an intermediate position with respect to the rotation center A2 'when positioning is performed. That is, the rotation center A3 is the rotation center A
2, shifted horizontally with respect to A2 '.

As shown in FIGS. 3 and 5, the sockets 62a and 62b have recesses 64 formed at the bottoms thereof.
Is formed, and a rod member 68 is slidably inserted into the concave portion 66. A coil spring 70 is provided in the recess 66, and the coil spring 70 elastically urges the bar member 68 in a direction protruding from the recess 66. A hole 72 is formed in the rod member 68 along the diameter direction, and a pin member 74 provided in the sockets 62a and 62b is inserted into the hole 72. Therefore, the rod member 68 is prevented from coming off by the pin member 74. The pin member 74 is a socket 62a,
It is prevented from falling off by a ring member 76 provided on the outer periphery of 62b.

A reduced diameter portion 78 is formed at the other end of each of the sockets 62a and 62b.
0b is inserted into the concave portion 84 of the connecting portion 82 provided on one end side of the connecting portion 82b. The connecting portion 82 has the reduced diameter portion 7 along the diameter direction.
8 is provided. For this reason, the sockets 62a and 62b and the connecting portion 82 can be integrally rotated. A connection portion 88 is provided on the other end of the universal joints 80a and 80b, and a recess 90 is formed in the connection portion 88. The reduced diameter portion 96 of the connecting member 94 fixed to the rotation shaft 92 of the air motors 24a and 24b is inserted into the concave portion 90, and the reduced diameter portion 96 is diametrically inserted into the connecting portion 88.
Is provided. Therefore, the rotating shaft 92 and the connecting portion 88 rotate integrally. The pin members 86 and 98 are prevented from falling off by ring members 100 and 102 provided on the outer periphery of the connection portions 82 and 88.

The gap between the connecting portions 82 and 88 is covered by a cover member 104 made of a material such as rubber. As shown in FIG. 6, a plurality of holes 106 are formed in the connection portions 82 and 88 along the axial direction, and each of the holes 106 communicates with each other by a circumferential groove 108. A ball member 110 is inserted into each of the holes 106. A cylindrical member 114 is inserted into the groove 108. Rotation center A2 of sockets 62a and 62b and air motor 24
Since the rotation centers A3 of the a and 24b are shifted in the horizontal direction as described above, the axes of the connecting portions 82 and 88 are also shifted. It is slightly inclined with respect to the axis. The cylindrical member 114 has a hole 116 into which the ball member 110 is fitted.

As shown in FIG. 2, one end of guide rods 118a and 118b is fixed to the support member 30, and the other end of guide rods 118a and 118b is
4 are fixed to the support members 120a and 120b provided upright. Cylindrical spacers 122a and 122b are fixed to one ends of the guide rods 118a and 118b, while coil springs 124a and 124b functioning as shock absorbers are provided at the other end. Guide rod 1
Guide blocks 130a and 130b constituting the displacement member 128 are slidably engaged with 18a and 118b, and a plate-like body 134 having a protruding portion 132 is fixed to one of the guide blocks 130a. The protrusion 132 presses the lever 138 of the microswitch 136 fixed to the base 14 when the displacement member 128 is displaced to a predetermined position.

As shown in FIG. 7, a displacement plate 140 is bridged between the guide blocks 130a and 130b.
A hole 141 is formed substantially at the center of the displacement plate 140, and a cylindrical member (positioning member) is formed in an opening forming the hole 141.
One end of 142 is fitted. A flange portion 144 that contacts the displacement plate 140 is formed on the cylindrical member 142. A cylindrical spacer 146 is mounted outside the cylindrical member 142. A hole 148 is formed through the inside of the cylindrical member 142, and a pin member 150 is slidably inserted into the hole 148. A handle 152 is formed at an upper end portion of the pin member 150, and a coil spring 154 is formed at a lower portion of the handle 152.
Is seated, and the other end of the coil spring 154 is seated on the upper surface of the tubular member 142. Therefore, the pin member 1
50 is constantly biased upward. A ring member 156 for retaining is fixed to a lower portion of the pin member 150, and the ring member 156 is engaged with the bottom of the tubular member 142.
A reduced diameter portion 160 is formed at a lower end portion of the pin member 150, and the reduced diameter portion 160 is a hole 16 of a plate-like member 162 fixed to the base 14 when the pin member 150 is displaced downward.
4 and presses a switch 166 provided at the lower part of the base 14.

Guide members 170a, 1
70b are provided. The displacement plate 140 has two screws 17
Two and four pin members 174 are erected, and the screws 172 and the pin members 174 are inserted into the holes 176 and 178 of the guide members 170a and 170b, respectively.
The guide members 170a and 170b are positioned. A nut 180 is screwed into the screw 172, so that the guide members 170a and 170b are prevented from coming off.

Variable tool spacing mechanism 1 according to the present embodiment
The disassembly device 10 into which the disassembly unit 2 is incorporated is basically configured as described above. The connecting rod 190 which is a work to be disassembled by the disassembly device 10 will be schematically described.

A connecting rod cap 194 is attached to the large end 192 of the connecting rod 190 by bolts 196a and 196b and nuts 198a and 198b.
The distance between the bolts 196a and 196b is equal to the distance between the respective rotation centers A2 of the sockets 62a and 62b of the disassembling apparatus 10. Large end 192 and connecting rod cap 1
Arc-shaped concave portions 200 and 202 are respectively formed in the 94, and the respective concave portions 200 and 202 form a perfect circular hole portion 204. Small end 206 of connecting rod 190
Is mounted with a piston 208.

Next, a method of using the decomposition apparatus 10 will be described.

First, the hole 204 of the connecting rod 190 is fitted into the spacer 146 of the tubular member 142 (see FIG. 7), and the outer wall of the large end 192 is guided by the guide members 170a and 170a.
0b, and the connecting rod 190 is positioned on the displacement member 128 (see FIG. 2).

Next, the displacement member 128 is connected to the guide rod 11.
8a and 118b in a direction approaching the sockets 62a and 62b, the one guide block 130
The protrusion 132 provided on the microswitch 136
The micro switch 136 outputs a signal indicating that the connecting rod 190 has been displaced to a predetermined position. At this time, the connecting rod 1 is provided on the spline-shaped wall forming the recess 64 of the sockets 62a and 62b.
Nut 1 screwed to 90 bolts 196a, 196b
98a, 198b engage.

Next, when the handle 152 of the pin member 150 is pressed downward against the elastic force of the coil spring 154, the reduced diameter portion 160 is fitted into the hole 164, and the switch 166 is moved by the reduced diameter portion 160. The air motors 24a, 24b are pressed by a signal from the switch 166.
Is driven.

When the rotation shafts 92 of the air motors 24a and 24b rotate, this rotational motion is transmitted to one of the connecting portions 88 constituting the universal joints 80a and 80b (see FIG. 3). The cylindrical member 114 is rotated from the wall to be formed via the ball member 110 while maintaining the state of being inclined with respect to the connecting portion 88. Further, the cylindrical member 11
4 transmits a rotational force to the connecting portion 82 via the ball member 110, and the connecting portion 82 rotates while maintaining a state of being inclined with respect to the axis of the tubular member 114, and the socket 62a,
62b also rotates. Therefore, the air motors 24a, 24b
Center of rotation A3 and center of rotation A of sockets 62a and 62b
2, the air motors 24a, 24b
Is transmitted to the sockets 62a and 62b satisfactorily. The rotation of the sockets 62a, 62b is transmitted to nuts 198a, 198b fitted to the sockets, so that the nuts
8a, 198b are removed from bolts 196a, 196b.

From the bolts 196a and 196b, the nut 19
8a and 198b are removed, the pin member 150 is lifted to release the pressing of the switch 166 by the reduced diameter portion 160, and the displacement member 128 is further moved to the nut runner 22a.
22b. Then, the connecting rod cap 194 is removed from the connecting rod 190.

The distance between the bolts 196a and 196b is shown in FIG.
The connecting rods 19 of different models are set at a predetermined interval shorter than the connecting rod 190 shown in FIG.
When the connecting rod cap 194 is disassembled, the grip portion 44 of the stopper 38a, 38b is displaced in a direction away from the support member 30 so that the fitting portion 46 and the hole portions 50a, 50d are displaced.
Release the mating. Next, the bushings 34a, 34b
Is rotated 60 ° as shown by a two-dot chain line in FIG.
The fitting portions 46 of the stoppers 38a, 38b are
0c to fix the positions of the bushings 34a, 34b. At this time, the rotation center A1 and the bushings 34a, 34b
The rotation center A2 before the rotation and the rotation center A2 'after the rotation draw a regular triangle, and the rotation center A2' is displaced by 2 mm in a direction parallel to the base 14 with respect to the rotation center A2. . Therefore, the distance between the sockets 62a and 62b is reduced by 4 mm in total.

At this time, universal joints 80a, 80b are provided between the sockets 62a, 62b and the air motors 24a, 24b.
b, and the rotation center A of the sockets 62a, 62b.
Even if 2 'and the rotation center A3 of the air motors 24a and 24b are displaced, the rotational motion of the air motors 24a and 24b is transmitted to the sockets 62a and 62b by the universal joints 80a and 80b, so that the air motors 24a and 24b need to be displaced. Absent.

Then, as described above, the connecting rod 190
When the hole 204 is fitted into the spacer 146 of the displacement member 128 and the displacement member 128 is displaced toward the nut runners 22a and 22b, the nuts 198a and 198b engage with the sockets 62a and 62b. Next, the air motors 24a and 24b are driven to remove the nuts 198a and 198b.

The connecting rod 1 having a different outer shape of the large end 192
When the 90 is disassembled by the disassembly device 10, the nut 180 of the displacement member 128 is loosened to guide the guide member 170a,
The guide members 170a, 170 corresponding to the shape of the large end 192 of the connecting rod 190 to be removed and disassembled 170b
b may be attached.

In the case of the connecting rod 190 having a different diameter of the hole 204, the spacer 146 fitted to the cylindrical member 142 may be replaced with a spacer adapted to the diameter of the hole 204.

In this embodiment, the bushings 34a, 34b
The distance between the sockets 62a and 62b is changed by 4 mm by setting the distance between the center of rotation A1 of the center of rotation and the rotation center A2 of the sockets 62a and 62b to 2 mm. , The sockets 62a and 62b can be changed by a desired distance. Further, by changing the rotation angle of the bushings 34a and 34b from 60 ° to another angle, the sockets 62a and 62b can be changed by a desired interval.

In this case, the position of the rotation center A2 of the sockets 62a, 62b may move in the vertical direction with respect to the base 14, but the flange portion 14 of the tubular member 142
By mounting a spacer (not shown) set corresponding to the position of the rotation center A2 on the rotation center A2,
2 can be corrected.

According to the present embodiment, the bushings 34a, 3b
By setting the rotation center A1 of the socket 4b and the rotation center A2 of the sockets 62a and 62b at different positions, the bushing 3
The distance between sockets 62a and 62b can be changed by rotating 4a and 34b. Therefore, it is possible to cope with connecting rods 190 of different types, and it is not necessary to prepare a plurality of disassembling devices 10. Therefore, the cost can be reduced as a whole, and the maintenance work is also facilitated. The work to change the interval is bush 3
4A and 34B are rotated and positioned only by the stoppers 38A and 38B. Therefore, the work is easy and the working efficiency can be improved. In addition, the sockets 62A and 62B can be used.
Can be accurately positioned.

Further, the rotational movement of the air motors 24a, 24b is controlled by the universal joints 80a, 80b.
The rotation center A2 of the sockets 62a, 62b and the rotation center A3 of the air motors 24a, 24b
May be shifted. For this reason, the air motor 24a,
24b may be fixed to the base 14, and only the sockets 62a and 62b may be configured to be displaced by the variable interval mechanism 12. Since the displaceable member may be small, the variable interval mechanism 12 itself can be configured to be small. It is.

[0043]

According to the variable tool spacing mechanism of the present invention, the following effects and advantages can be obtained.

By setting the center of rotation of the bush and the center of rotation of the tool at different positions, the bush can be rotated to change the distance between the pair of tools, so that there are many types of workpieces corresponding to the type of workpiece. There is no need to prepare tools. For this reason, a space for holding many tools on standby is not required, maintenance is easy, and costs can be reduced. In addition, the work of changing the interval is easy, and the work efficiency can be improved.

Further, since the rotational motion of the rotary drive source is transmitted to the tool by the universal joint, the rotational center of the tool and the rotary center of the rotary drive source may be shifted. Therefore, it is sufficient that the rotary drive source is fixed to the base and only the tool is displaced by the variable distance mechanism, and the variable member itself can be reduced in size because only a small member is required to be displaced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disassembling apparatus using a variable tool spacing mechanism according to an embodiment of the present invention.

FIG. 2 is a plan view of the disassembly device of FIG.

FIG. 3 is a partially enlarged longitudinal sectional view of the disassembly apparatus of FIG.

FIG. 4 is a partially enlarged front explanatory view of a bush used in the disassembling apparatus of FIG. 1;

5 is an exploded perspective view, partially in section, of a socket used in the disassembly apparatus of FIG. 1;

6 is a universal joint VI- used in the disassembling apparatus of FIG.
FIG. 6 is a sectional view taken along line VI.

FIG. 7 is a sectional view taken along line VII-VII of the disassembling apparatus of FIG. 2;

FIG. 8 is a perspective view of a disassembly apparatus according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Disassembly apparatus 12 ... Variable distance mechanism 22a, 22b ... Nut runner 30 ... Support member 34a, 34b ... Bush 38a, 38b ...
Stoppers 62a, 62b ... sockets 80a, 80b ...
Universal joint 142: cylindrical member 170a, 170
b: guide member 190: connecting rod 196a, 196
b: bolt 198a, 198b: nut

Claims (5)

[Claims] A base, a support member erected on the base, a pair of bushes rotatably provided on the support member, a pair of tools respectively provided on the pair of bushes, A pair of rotary driving sources provided on the base in parallel to each other and rotating the pair of tools, wherein the rotation center of the tool is arranged at a position different from the rotation center of the bush. Variable interval mechanism. 2. The mechanism according to claim 1, wherein said rotary drive source is fixed to said base, and a rotary motion of said rotary drive source is transmitted to said tool via a universal joint. Variable interval mechanism. 3. The mechanism according to claim 1, wherein said bushing is provided with a stopper for positioning a rotation position of said bushing with respect to said support member. 4. The mechanism according to claim 1, wherein the variable distance mechanism is incorporated in a disassembling device for removing a connecting rod cap from a connecting rod, and the tool attaches the connecting rod cap to the connecting rod. A variable tool spacing mechanism, which is a nut runner for removing a pair of nuts to be assembled. 5. The mechanism according to claim 4, wherein said base is provided with a displacement member for moving said connecting rod and said connecting rod cap toward and away from said tool, said displacement member comprising said connecting rod and said connecting rod. A variable tool spacing mechanism, comprising: a positioning member that fits into a hole formed by a cap; and a guide member that contacts the outside of the connecting rod and the connecting rod cap.