JPH0224586Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an O-ring fitting device for fitting an O-ring into a ring groove formed on the circumferential surface of a shaft hole of a workpiece.

(Prior art) Conventionally, as this type of device,
According to the publication, a vertically elongated guide cylinder is formed with a hopper part into which an O-ring can be inserted freely at the upper end;
An O-ring pusher rod that can be freely moved in and out of the guide tube through a vertical slit formed around the guide tube and can move up and down, and an upper rod that can be inserted into the guide tube from above are provided. After dropping the O-ring, first, in the first step, the push-down rod is protruded inward and moved downward to remove the circumference 1 of the O-ring.
Hook the pusher rod to the position and draw the O-ring into the guide tube in a vertical position. Next, after retracting the pusher rod outward, the upper end is inserted into the shaft hole of the workpiece placed below the guide tube in the second step. Insert the first lower rod with an inclined surface from below, insert the upper rod into the guide tube, push down the O-ring, guide it to the inclined surface of the first lower rod, and insert the lower part of the O-ring into the workpiece. The first lower rod is inserted into the ring groove in the shaft hole of the workpiece, and then the first lower rod is pulled out from the shaft hole of the workpiece. In the third step, the second lower rod with its upper end as a horizontal seating surface is inserted into the lower edge of the ring groove. It is known that the O-ring is inserted into the shaft hole of the workpiece so that the seating surfaces match, and then the upper rod is further lowered to fit the entire O-ring into the ring groove.

With this method, the O-ring must be fitted in three steps, which is inefficient, and two lower rods, the first and second rods, and their respective drive sources are required. A complicated drive mechanism is required to move the pusher rod in and out and up and down, making the device expensive.

In addition, according to Japanese Patent Application Laid-open No. 47-40566, a holder with a pair of clamp levers attached to the tip that clamps an O-ring from both sides in the diametrical direction is slid onto a cylindrical pressing rod that can be inserted into the shaft hole of a workpiece. Insert the O-ring freely and biased forward by a spring, and as the pressing rod moves forward, the O-ring, which is compressed and held in an elliptical shape by the clamp lever, is inserted into the shaft hole of the workpiece, with both longitudinal ends of the O-ring facing backward. Push it in while deforming it into an arcuate shape, and when the O-ring reaches just in front of the ring groove, stop the forward movement of the holder and move only the pressing rod forward, and then use the control pin extending from the cylinder provided on the pressing rod side to close the clamp lever. At the same time, press the O-ring by pushing the ends of the pressing rods against both long-axis ends of the O-ring, and then move both short-axis ends of the O-ring, which was held by the clamp lever, to the tip of the lever. It is also known that the O-ring is extruded and fitted into the ring groove by elastic restoring force, and then the pressing rod is further advanced to fit the entire O-ring into the ring groove.

However, with this, there is a problem in how to clamp the O-ring to the clamp lever, especially since the clamp lever is opened within the shaft hole of the workpiece.
The opening degree cannot be set larger than the diameter of the shaft hole, and here O
Since the diameter of the ring in its free state is larger than the diameter of the shaft hole, it is necessary to preliminarily compress the O-ring and then clamp it to the clamp lever, which requires a complicated means and requires a device that includes O-ring supply means. The overall cost will be quite high.

(Problems to be solved by the invention) In view of the above points, the present invention uses a guide tube to supply O-rings in a simple drop-in method, and operates one rod each at the upper and lower parts. The purpose is to provide a device with a simple structure that allows an O-ring to be efficiently fitted into a workpiece with just one operation.

(Means for Solving the Problem) In order to achieve the above object, the present invention is a device for fitting an O-ring into a ring groove formed on the circumferential surface of a shaft hole of a workpiece. A vertically elongated guide tube with a flexible hopper part,
An upper rod that can be inserted into the guide tube from above, and a rod that is provided below the guide tube so that it can be raised and lowered coaxially with the guide tube, and that is fitted into the shaft hole of the workpiece from below to a depth that reaches the lower edge of the ring groove. and a lower rod having an upper seat that can be fitted together, the guide rod extending upward from the upper end surface of the seat and being inserted into the guide cylinder with an annular gap therebetween. The lower part of the upper rod is formed into a cylindrical part that is inserted between the upper rod and the lower part of the upper rod. A plurality of leg pieces that are slidably engaged with a plurality of vertically elongated slits formed in the upper rod and the guide cylinder, respectively, the lower ends of which are normally connected to the lower ends of the cylindrical portions of the upper rod. It is characterized by being biased downward by a spring so as to protrude further downward.

(Function) When the upper rod is lowered, the lower end of the leg comes into contact with the O-ring that has been dropped into the hopper, and this abutting part is moved between the leg and the guide rod in the guide cylinder by the leg. I can be pushed into it. Here, the leg engages with the half circumference of the O-ring, and if this half-circumference is defined as one side, the pushing force of the leg does not act on the other side of the O-ring, and the O-ring is deformed so that the other side is curved upward, and the O
The compression allowance of the ring is absorbed by the curved part on the other side, and O
The ring can be smoothly pushed down inside the guide cylinder.
The guide rod also prevents the O-ring from being vertical.

When the leg piece is lowered to a fixed position and stopped, the upper rod moves downward relative to the leg piece while compressing the spring, and the lower end of the cylindrical part of the upper rod protrudes below the leg piece, causing an O.
The ring is further pressed down by the tubular section. At this time, the cylindrical part first comes into contact with the upper end of the other side of the O-ring that is curved upward, and here, one side of the O-ring is lowered due to friction with the inner peripheral surface of the guide cylinder. Because the O-ring is held in place, the O-ring uses one side as a fulcrum and tilts until the other side is at the same level as the one side, and the O-ring assumes an arcuate horizontal position with the middle part curved downward. The cylindrical part comes into contact with the upper end of one side and the upper end of the other side, and in this position, the O-ring is pushed down from the guide cylinder into the shaft hole of the workpiece, and first the middle part of the O-ring is inserted into the lower rod. It comes into contact with the seat and is fitted into the ring groove by elastic restoring force, and then, starting from the middle part, both sides of the O-ring are sequentially fitted into the ring groove.

(Example) Referring to FIGS. 1 and 2, 1 is a base, 2 is a conveyor on the base 1, 3 is a workpiece conveyed by the conveyor 2, and the workpiece 3 is a third As shown in the figure, a ring groove 5 into which an O-ring 8 is fitted is provided on the circumferential surface of the shaft hole 4. Reference numeral 6 denotes a slide base mounted on a bracket 1a erected on the base 1 above the conveyor 2. A feeder 7 is provided on the base 6 and is moved forward and backward by a cylinder 7a. The O-ring 8 is dropped from a drop window 9 as shown in the third figure formed at the tip of the slide base 6 into a vertically elongated guide tube 12 arranged below the drop window 9.

The guide cylinder 12 has a hopper part 12a at the upper end into which the O-ring 8 is inserted, and the inner diameter of the main body part extending below the hopper part 12a is formed to have the same diameter as the shaft hole 4 of the workpiece 3.

Below the guide tube 12 is a lower rod 2 which is raised and lowered coaxially with the guide tube 12 by a cylinder 23.
4 is provided. The lower rod 24 has a ring groove 5 formed in its upper part into the shaft hole 4 of the workpiece 3 from below.
a catch seat 24a that can be fitted to a depth that reaches the lower edge of the
A guide rod 10 is formed extending upward from the upper end surface of the seat 24a, and the lower rod 24
By raising the workpiece 3 from below the conveyor 2, the workpiece 3 on the conveyor 2 is lifted from the conveyor 2 by fitting the seat 24a into the shaft hole 4 and centered with respect to the guide tube 12, and the guide rod 10
is inserted into the guide tube 12 with an annular gap 11 therebetween.

Further, an upper rod 15 is provided above the guide tube 12 and is raised and lowered by a cylinder 16.
The upper rod 15 can be freely inserted into the guide tube 12 through the drop window 9. The upper rod 15 has a cylindrical part 15a that can be inserted into the lower part 11 at its lower part.
The upper rod 15 is further provided with three points at 90° intervals on the half circumference of the O-ring 8 dropped into the hopper portion 12a, that is, on the rear half circumference with respect to the forward direction of the feeder 7. A ring 14 having three engageable leg pieces 13, 13, 13 hanging thereon was extrapolated. Each of the leg pieces 13 is slidably engaged with a vertically elongated slit 20 formed at a corresponding position between the upper rod 15 and the guide tube 12, and furthermore, the ring 14 is inserted into the upper rod. 15 and a fixed flange 17, the spring 18 is biased downwardly, and each leg piece 13 is normally
The lower end is made to protrude downward from the lower end of the cylindrical portion 15a.

The ring 14 has a stopper 19 that engages with a vertical guide groove 15b formed in the upper rod 15.
The lower end of the slit 20 formed in the guide tube 12 is used as the stopper surface 21, and the lower end of the slit 20 formed in the guide tube 12 is used as the stopper surface 21. The lowering position relative to the guide tube 12 is kept constant. Incidentally, on the path of the feeder 7, an oil supply means 22 for applying lubricating oil to the O-ring 8 is provided.

Next, to explain the operation of the above embodiment, the work 3 is guided on the conveyor 2 and stopped at a predetermined position, and the lower rod 24 is first raised from the lower position shown in the third figure. For example, the guide rod 10 passes through the shaft hole 4 of the work 3 and guides the guide cylinder 1.
The workpiece 3 is inserted into the conveyor 2 with an annular gap 11 therebetween, and the catch seat 24a is fitted into the shaft hole 4 to lift the workpiece 3 from the conveyor 2, and the workpiece 3 at the lower end of the guide tube 12 is centered. and are joined together.

Next, as the feeder 7 moves forward, the O-ring 8 is guided forward and dropped through the drop window 9 into the hopper portion 12a at the upper end of the guide tube 12. In this case, since the O-ring 8 falls from its front side, the hopper part 1
The posture of the O-ring 8 dropped into position 2a is likely to be more or less forward-downward as shown in Figure 4. Next, the upper rod 15 is moved downward, and as a result, the three leg pieces 13, 13, 13 first come into contact with the rear half circumference of the O-ring 8, and the half circumference is removed from the hopper portion 12a to the guide tube. The front part of the O-ring 8 is guided by the annular gap 11 in the guide tube 12 and pushed down, while the front part of the O-ring 8 is pushed down by the friction between the rear part and the inner peripheral surface of the guide cylinder 12, as shown in the fifth figure. It curves upward, and the length of the O-ring 8 that is compressed by the guide cylinder 12 escapes to the front curved part, and the O-ring 8 is pushed at three places on the rear side and maintains this curved state until the gap. 11 and is guided smoothly downward.

Next, these leg pieces 13 come into contact with the stopper surface 21 and are prevented from further downward movement, and thereafter the spring 18
The upper rod 15 moves downward relative to the leg piece 11 while compressing the cylindrical part 15a, and the lower end of the cylindrical part 15a protrudes below the leg part 13, and the O-ring 8 is pushed down by the cylindrical part 15a. The cylindrical portion 15a first contacts the front side of the O-ring 8 which is curved upward, and the O-ring 8 contacts the rear side whose downward movement is restrained by friction with the inner circumferential surface of the guide tube 12. The rear part and the front part are tilted at the same level using the fulcrum as a fulcrum, and as shown in FIG. Cylindrical part 1
5a abuts, and in this position, the O-ring 8 is pushed down from the guide cylinder 12 into the shaft hole 4 of the workpiece 3,
First, the middle portion of the O-ring 8 is guided by the seat 24a and fitted into the ring groove 5 by elastic restoring force, and then the entire O-ring 8 is inserted into the ring groove 5 as shown in FIG.
be fitted into.

Next, the upper rod 15 is raised and the lower rod 24 is lowered, the workpiece 3 is sent out and the next workpiece 3 is carried in, and the above operation is repeated to continuously perform the O-ring fitting operation.

In addition, when the leg piece 13 is set to one at the rear, if the front part of the O-ring 8 is partially in the gap 11, the leg piece 13 will push the rear part of the O-ring 8 into the gap 11. At this time, the O-ring 8 is compressed in the front-rear direction and deformed into a long oval shape in the lateral direction, and both lateral sides remain in the hopper part 12a, and the pushing-down force from the front part to the rear part is applied using these both sides as fulcrums. An upward rotational moment is applied, and the front part is
1, jumps up and gets caught on the top of the guide rod 10, and then the O-ring 8 may be caught between the guide rod 10 and the cylindrical portion 15a, which descends, and be cut.

However, in the present invention, such a problem does not occur because the plurality of leg pieces 13 press the rear side of the O-ring 8 at a plurality of locations.

(Effects of the invention) As described above, according to the invention, the O-ring can be supplied by dropping it into the hopper part at the upper end of the guide tube.
The O-ring supply means can be configured simply, and the O-ring dropped into the hopper can be reliably and efficiently fitted into the workpiece simply by operating one rod at the top and one at the bottom. A high-performance device can be obtained at a low cost by simplifying its structure, and has the effect of significantly improving productivity.

[Brief explanation of the drawing]

Fig. 1 is a front view of one example of the device of the present invention, Fig. 2 is a left side view of Fig. 1, Figs. Figure 7 -
FIG. 3...Workpiece, 4...Shaft hole, 5...Ring groove,
8...O-ring, 10...Guide rod, 11...
...Annular gap, 12...Guide tube, 12a...Hopper part, 13...Leg piece, 15...Upper rod, 15
a...Cylindrical part, 17...Spring, 20...Slit, 24...Lower rod, 24a...Socket.

Claims (1)

[Scope of utility model registration request] This is a device for fitting an O-ring into a ring groove formed on the circumferential surface of a shaft hole of a workpiece, and includes a vertically elongated guide cylinder having a hopper part at the upper end into which the O-ring can be freely inserted; An upper rod that can be inserted from above, and an upper part that is provided below the guide tube so that it can be raised and lowered coaxially with the guide tube, and that can be fitted into the shaft hole of the workpiece from below to a depth that reaches the lower edge of the ring groove. and a lower rod having a seat, the lower rod having a guide rod extending upwardly from the upper end surface of the seat and inserted into the guide cylinder with an annular gap therebetween. , the lower part of the upper rod is formed into a cylindrical part that is inserted between the upper rod and the upper rod, and the upper rod is capable of coming into contact with a plurality of places on the half circumference of the O-ring dropped into the hopper part; A plurality of leg pieces are slidably engaged with a plurality of vertically elongated slits formed in the upper rod and the guide tube, respectively, and the lower ends thereof normally protrude downward from the lower end of the cylindrical portion of the upper rod. An O-ring fitting device characterized in that it is biased downward by a spring so that the O-ring fits in the O-ring.