JP6261635B2 - Press-fitting device - Google Patents

Description

  The present invention relates to a press-fitting device, and more particularly, to a hand-held press-fitting device with a simple configuration used for parts press-fitting work such as bush press-fitting work to shaft holes and bosses in various machine tools. .

  In various machine tools, machine parts, and the like including a shaft, a bush for supporting the shaft with low friction is press-fitted into the shaft hole. Usually, the press-fitting work is not easy because the press-fitting of this bush requires press-fitting in tons.

  Conventionally, various bush press-fitting devices for mechanically performing the bush press-fitting work have been proposed (Japanese Patent Laid-Open Nos. 2005-324635, 2005-23897, 2001-62645, etc.). . However, these bush press-fitting devices that have been proposed in the past are both large-scale and costly to introduce, and cannot be used easily.

JP 2005-324635 A JP 2005-2338397 A JP 2001-62645 A

  As described above, all of the bush press-fitting devices that have been proposed in the past have a large-scale configuration and are expensive to introduce and cannot be easily used. Therefore, the present invention provides a hand-held press-fitting device that can be supplied at a relatively low cost with a simple and compact configuration, is easy to use, and is suitable for use in press-fitting a bush that requires press-fitting in tons. This is the issue.

The invention according to claim 1 for solving the above problem is a hand-held press-fitting device comprising a device main body provided with a drive mechanism and an attachment attached to an attachment mounting portion of the device main body, , Comprising a grip and an oil tank having a charger on its lower surface, equipped with a drive motor, a hydraulic pump driven by the drive motor, and a cylinder shaft driven forward and backward by the hydraulic pump, The attachment includes a pusher fixed to the cylinder shaft, and a frame made of a pair of frame members provided so as to be opposed to each other with a distance at which guide arms provided on the upper and lower surfaces of the pusher can slide. The pusher moves forward with the part press-fitting target part inserted into the space of the frame. A handheld indentation device, wherein a part pressed to the part press-object portion is carried out by.

In one embodiment, the attachment mounting portion is installed in the apparatus main body via a stroke adjusting piece of the cylinder shaft. For example, the stroke adjustment piece includes an outer cylinder that is screwed between the tip of the apparatus main body and the attachment mounting part, an auxiliary cylinder that is fitted in the outer cylinder, and a slide in the auxiliary cylinder. The auxiliary shaft is arranged so as to be capable of being connected to the cylinder shaft.

  In one embodiment, the guide arm has a sheath tube that extends in the horizontal direction, and the sheath tube extends in the horizontal direction from the front end surface side of the frame and has a return spring wound around one half thereof. The other half portion around which the return spring is not wound is inserted, and the guide arm is always urged in the return direction by the return spring through the sheath tube.

  In one embodiment, a sensor mechanism for measuring the amount of movement of the pusher is installed in the frame, and a load cell is installed on the front end side inner end surface of the frame. In one embodiment, the frame is provided with a handle for gripping during press-fitting work.

  The present invention is as described above, has a simple and compact configuration, can be supplied at a relatively low cost, is easy to use, and is suitable for use in press-fitting work of a bush that requires pressure input in tons. This can provide a simple handheld press-fitting device.

It is a principal part front view of 1st Embodiment of the press injection apparatus which concerns on this invention. It is a principal part side view of 1st Embodiment of the press injection apparatus which concerns on this invention. It is a fragmentary broken view which shows the structure of the stroke adjustment piece of the press injection apparatus which concerns on this invention. It is a use condition figure of a 1st embodiment (a part is omitted) of a press fit device concerning the present invention. It is a principal part front view of 2nd Embodiment of the press injection apparatus which concerns on this invention. It is a principal part side view of 2nd Embodiment of the press injection apparatus which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the accompanying drawings. First, the embodiment shown in FIGS. 1 to 5 will be described. The press-fitting device according to the present invention is a gun-type hand-held press-fitting device, and a grip 3 having a charger 2 at its lower end and an oil tank 4 are installed on the lower surface of the device main body 1. Although not shown, the apparatus main body 1 is equipped with a drive motor, a hydraulic pump driven by the drive motor, and a piston driven forward and backward by the hydraulic pump, and a cylinder shaft 5 connected to the piston moves forward and backward. To do. Since the configuration inside the apparatus main body 1 is a general one, a detailed description thereof is omitted.

  The front end portion 6 of the apparatus main body 1 is threaded, and the attachment connector 11 is screwed and fixed thereto. However, in this configuration, the stroke of the cylinder shaft 5 is insufficient for the stroke intended in the present invention. There are many cases. Therefore, in the present invention, an adjustment piece 12 for extending the stroke of the cylinder shaft 5 is interposed between the distal end portion 6 of the apparatus main body 1 and the attachment connector 11. That is, the attachment connector 11 is removed from the front end portion 6 of the apparatus main body 1, one end of the adjustment piece 12 is screwed thereto, and the attachment connector 11 is screwed to the other end of the adjustment piece 12 (see FIG. 3).

  The adjustment piece 12 includes an outer cylinder 13, an auxiliary cylinder 14 fitted inside the outer cylinder 13, and an auxiliary shaft 15 slidably disposed in the auxiliary cylinder 14. The exterior cylinder 13 includes a female screw portion 13a for screwing the front end portion 6 of the apparatus main body 1 at the rear end portion, and a male screw portion 13b for screwing the attachment connector 11 to the front end portion. Further, the auxiliary shaft 15 includes a female thread portion for screwing the tip end portion of the cylinder shaft 5 at the rear end portion, and a pusher 21 to be described later is screwed and fixed to the tip portion extending from the attachment connector 11. The male screw part 15a is provided.

  A plurality of kinds of adjustment pieces 12 having different lengths may be prepared and selectively exchanged so as to correspond to a desired extension length of the stroke of the cylinder shaft 5.

  A frame 21 is fixed to the attachment connector 11 by forming a pair of frame members 22 at appropriate intervals. Typically, the frame member 22 of the frame 21 is formed in a hollow rectangular shape, but the size thereof is a bearing portion that is a target for press-fitting the bush 51 of various devices in the inner space when the bush 51 is press-fitted. It is made large enough to insert 52 (see FIG. 4). The load cell 29 is fixed to the inner surface of the end plate 30 of the frame 21, and the compressive load by the pusher 23 is detected.

  A pusher 23 is screwed and fixed to the distal male screw portion 15 a of the auxiliary shaft 15 facing the frame 21, and the pusher 23 is driven by the auxiliary shaft 15 to advance and retreat in the space portion of the frame 21. Guide arms 24 and 24 a that slide between the frame members 22 of the frame 21 are installed on the upper and lower surfaces of the pusher 23, respectively.

  Each guide arm 24, 24 a is provided with one or a plurality of sheath tubes 25 projecting in the horizontal direction, and the front half of the core rod 26 is inserted into each sheath tube 25. The core rod 26 extends in a horizontal direction from a stopper 27 installed between the distal end portions of the frame member 22 toward the sheath tube 25, and the distal end portion passes through the sheath tube 25 and further penetrates the guide arms 24 and 24a. It extends to. A return spring 28 is wound around the latter half of the core rod 26. One end of the return spring 28 comes into contact with the stopper 27 and is held down, and the other end comes into contact with the end surface of the sheath tube 25 and is held down, so that the sheath spring 25 is always pressed and urged.

  The frame 21 is further provided with a sensor mechanism for detecting the amount of movement of the handle 31 and the guide arms 24 and 24a, in other words, the amount of movement of the pusher 23, which is gripped during the press-fitting operation. The handle 31 is attached to the end plate 30 of the frame 21. The sensor mechanism includes a sensor main body 33 installed on a sensor mounting arm 32 extending upward from each frame member 22 and a moving head 34 installed on an upper guide arm 24. The moving head 34 moves integrally with the pusher 23, and the movement distance of the pusher 23 is detected by the sensor body 33.

  Then, the movement distance of the pusher 23 for obtaining an appropriate pressing force is acquired by tracing the movement distance of the pusher 23 and the compression load of the pusher 23 corresponding to the movement distance detected by the load cell 29. Based on this, the drive motor in the apparatus main body 1 is controlled.

  In performing the work of press-fitting the bush 51 into the bearing portion 50 using the press-fitting device having the above configuration, the bush 51 on which a jig is set is temporarily fitted into the bearing portion 50, and the grip 3 and the handle 31 of the device main body 1 are gripped. Holding the bearing 50 into the frame 21 (see FIG. 4). Therefore, when the trigger 3a provided in the grip 3 is pulled to start the motor in the apparatus main body 1, the hydraulic pump or the like is activated, and the pusher 23 in contact with the jig moves the cylinder shaft 5 and the auxiliary shaft 15 together. Then, it moves forward against the urging force of the return spring 28, and the bearing portion 50 is sandwiched between the end plate 30 of the frame 21 and strongly pressed. Thus, the bush 51 temporarily fitted in the bearing portion 50 is completely press-fitted into the bearing portion 50.

  When the trigger 3a is released after the press-fitting operation is finished and the motor in the apparatus main body 1 is stopped, the urging force of the return spring 28 causes the guide arms 24 and 24a to be urged by the pushing action of the pusher 23 against the bearing portion 50. The pusher 23 returns to its original position by being transmitted to the pusher 23 via the pusher 23.

  Next, a second embodiment shown in FIGS. 5 and 6 will be described. In the second embodiment, the configuration of the sensor mechanism and the configuration of the switch portion are mainly changed from the configuration of the first embodiment. In addition, since the part which attached | subjected the same code | symbol as 1st Embodiment has shown the same component, detailed description is abbreviate | omitted.

  In the second embodiment, a position detection sensor 35 that is an encoder of a linear absolute method (an absolute address method that represents a distance from 0 with reference to 0) is used. The illustrated position detection sensor 35 is a twin rod type in which two rods 37 are slidably inserted in a sensor body 36, and the sensor body 36 straddles the end portions of the pair of frame members 22. Thus, the sensor bracket 38 is fixedly installed on the frame member 22. The ends of the two rods 37 are connected by connecting members 39 and 40, and the tip of an L-shaped rod drive arm 41 extending from the upper end of the guide arm 24 is fixed to one connecting member 40.

  In the case of this sensor mechanism, when the pusher 23 moves back and forth, the pair of rods 37 connected to the connecting member 40 moves forward and backward integrally through the guide arm 24 and the rod drive arm 41 following the movement. At this time, the sensor body 36 is fixedly supported by the sensor bracket 38 and does not move, so that the rod 37 slides in the sensor body 36. Thus, the rod movement amount, in other words, the movement amount of the pusher 23 is detected in the sensor main body 36, and the movement amount of the pusher 23 and the movement distance of the pusher 23 corresponding to the movement distance are detected as in the first embodiment. A compressive load is detected by the load cell 29.

  In the second embodiment, a first switch 43 for turning on / off the pusher 23 is provided at the tip of the handle 31. Further, an auxiliary arm 44 extending upward is provided near the adjustment piece 12 of the apparatus main body 1, and an auxiliary grip 45, a display panel 46 including an on / off display lamp, a measurement value display window, and the like are attached thereto. A second switch 45 a is provided on the auxiliary grip 45. Although this device is a hand-held type, it is heavy, so that a suspension ring 47 is disposed at the tip of the auxiliary arm 44 in order to support it and facilitate the work, Pass the wire etc. over the work place there.

  In this configuration, the handle 31 is gripped with one hand and the auxiliary grip 45 is gripped with the other hand during operation. In this case, the thumb 31 is held with the handle 31 held. The first switch 43 can be operated, and the second switch 45a can be operated with the thumb while the auxiliary grip 45 is held, so that the operability is good. In this case, it is preferable to make the first switch 43 and the second switch 45a a double switch so as not to operate unless both are pressed, so as to ensure safety.

  The press-fitting device according to the present invention is suitable for the press-fitting work of the bush. However, the present invention is not limited to this, and it is needless to say that the press-fitting apparatus can be used for press-fitting other various parts and the strong press work of the part.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Charger 3 Grip 4 Oil tank 5 Cylinder shaft 6 Tip part 11 Attachment connector 12 Adjustment piece 13 Exterior cylinder 14 Auxiliary cylinder 15 Auxiliary shaft 21 Frame 22 Frame material 23 Pusher 24, 24a Guide arm 25 Sheath tube 26 Core ２７ 27 Stopper 28 Return spring 29 Load cell 30 End plate 31 Handle 32 Mounting arm 33 Sensor body 34 Moving head 36 Sensor body 37 Rod 38 Sensor bracket 39, 40 Connecting portion 41 Rod drive arm 43 First switch 44 Auxiliary arm 45 Auxiliary grip 45a Second switch 46 Display panel 50 Bearing part 51 Bushing

Claims (7)

A handheld press-fitting device comprising a device main body provided with a drive mechanism and an attachment attached to an attachment mounting portion of the device main body,
The apparatus body includes a grip and an oil tank having a charger on its lower surface, and is equipped with a drive motor, a hydraulic pump driven by the drive motor, and a cylinder shaft driven forward and backward by the hydraulic pump. Made up of,
The attachment includes a pusher fixed to the cylinder shaft, and a frame made of a pair of frame members provided so as to be opposed to each other with a distance at which guide arms provided on the upper and lower surfaces of the pusher can slide. A hand-held press-fitting device, wherein a part press-fitting to the part press-fitting target part is performed by advancing the pusher in a state where the part press-fitting target part is inserted into the space part of the frame. The hand-held press-fitting device according to claim 1, wherein the attachment mounting portion is installed in the device main body via a stroke adjustment piece of the cylinder shaft. The stroke adjusting piece is slidable in the outer cylinder, an auxiliary cylinder fitted in the outer cylinder, and an outer cylinder that is screwed between the tip of the apparatus main body and the attachment mounting portion. The handheld press-fitting device according to claim 2 , comprising an auxiliary shaft disposed and connected to the cylinder shaft. The guide arm has a sheath tube extending in the horizontal direction, and the core tube extends in the horizontal direction from the front end surface side of the frame toward the sheath tube, and a return spring is wound around one half of the sheath arm. The other half portion around which the return spring is not wound is inserted, and the guide arm is constantly urged in the return direction by the return spring through the sheath tube. The hand-held press-fit device as described. The hand-held press-fitting device according to any one of claims 1 to 4, wherein a sensor mechanism for measuring the amount of movement of the pusher is installed in the frame. The handheld press-fitting device according to any one of claims 1 to 5, wherein a load cell is installed on an inner end surface of the front end side of the frame. The handheld press-fitting device according to any one of claims 1 to 6, further comprising a handle that is gripped during press-fitting.

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